CN102035366A - Power supply device - Google Patents
Power supply device Download PDFInfo
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- CN102035366A CN102035366A CN2010106159155A CN201010615915A CN102035366A CN 102035366 A CN102035366 A CN 102035366A CN 2010106159155 A CN2010106159155 A CN 2010106159155A CN 201010615915 A CN201010615915 A CN 201010615915A CN 102035366 A CN102035366 A CN 102035366A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a power supply device. A front feed module is arranged between a power factor correction (PFC) module and a main power switching converter. The front feed module acquires the output voltage of the PFC module, extracts power frequency ripples from the output voltage of the PFC module, generates a front feed control signal representing the power frequency ripples and feeds the front feed control signal back to the main power switching converter. The main power switching converter controls the change direction of an output gain to be reverse to the fluctuation direction of the front feed control signal. Therefore, the problems of power loss and electromagnetic interference caused when an auxiliary load is powered by an auxiliary power supply converter are solved, and the voltage output by the main power switching converter can directly power the auxiliary load. The circuit in the main power switching converter is a soft switching circuit, so that the electromagnetic interference can be reduced and the working efficiency of the whole machine can be improved.
Description
Technical field
The present invention relates to power technique fields, particularly a kind of electric supply installation.
Background technology
Referring to Fig. 1, this figure is the structure chart of electric supply installation in the prior art.
This electric supply installation comprises power factor correction (PFC, Power Factor Correction) module 101, master power switch converter 102, backlight control and voltage transformation module 103, feedback module 104 and converter of auxiliary power supply 105.
The AC power supplies of 101 pairs of inputs of PFC module is carried out power factor correction.The output of PFC module 101 connects the input of master power switch converter 102 and converter of auxiliary power supply 105.Master power switch converter 102 is exported to backlight control and voltage transformation module 103 after being used for the output voltage of PFC module 101 regulated.Backlight control and voltage transformation module 103 are used for that the voltage of master power switch converter 102 outputs is regulated the back and power for main load, and this main load can be backlight.Wherein, the input of feedback module 104 connects the output of master power switch converter 102, and the output of feedback module 104 connects the control end of master power switch converter 102.
Converter of auxiliary power supply 105 is used for the output voltage of PFC module 101 is carried out being assistant load and system standby power supply after the transformation.Wherein assistant load can be internal control circuit, loud speaker.The converter of auxiliary power supply 105 main anti exciting converters that adopt.
What the main circuit among Fig. 1 partly adopted is the closed loop feedback structure of master power switch converter 102 and feedback module 104.Because back one-level backlight control and voltage transformation module 103 just can be finished the requirement into the display unit power supply among Fig. 1, so, in order to save components and parts and circuit cost, main circuit can adopt the open loop circuit of the non-adjustment that the master power switch converter is only arranged, as shown in Figure 2.So just, can save the feedback module 104 among Fig. 1.Simultaneously, the LLC resonance oscillation semi-bridge translation circuit of master power switch converter 202 parts can be selected PWM controller at a low price for use, needn't select expensive LLC frequency modulation special chip.
Because LCD TV and plasm TV require Switching Power Supply to have higher efficient and level and smooth electromagnetic interference signal, there is following problem in electric supply installation shown in Figure 2: internal control circuit in the assistant load and loud speaker generally have tens watts power output, and the converter of auxiliary power supply efficient of anti exciting converter formula is on the low side, will cause the efficient of entire system not high like this.And anti exciting converter is the hard switching circuit, if through-put power is too big, will cause electromagnetic interference bigger than normal.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of electric supply installation, can improve the operating efficiency of system, reduces electromagnetic interference, and reduces cost.
The invention provides a kind of electric supply installation, comprising: power factor correction PFC module, feed-forward module, backlight control and voltage transformation module, converter of auxiliary power supply and the master power switch converter that does not receive self output feedback;
The input of PFC module connects AC power supplies, and the output of PFC module connects the input of master power switch converter and the input of feed-forward module respectively;
Feed-forward module is used to gather the output voltage of PFC module, generates the feed-forward control signals of power frequency ripple in the output voltage that characterizes the PFC module, feed-forward control signals is exported to the feedback end of master power switch converter;
The master power switch converter, the change direction that is used to control output gain is opposite with the fluctuation direction of described feed-forward control signals, and the voltage after output suppresses is part assistant load or all assistant load power supplies;
The input of backlight control and voltage transformation module connects the output of master power switch converter, and is main electric;
The input of described converter of auxiliary power supply connects the output of described PFC module, and being used for when the power consumption equipment standby is the power consumption equipment power supply; Simultaneously, when described master power switch converter was powered for the part assistant load, converter of auxiliary power supply was remaining assistant load power supply.
Preferably, described master power switch converter comprises pulse generation controller, drive circuit and power topological circuit;
The pulse generation controller is used to accept feed-forward control signals, sends the pulse signal of corresponding frequencies and duty ratio;
Drive circuit is used to accept the pulse signal of pulse generation controller, produces the required drive signal of switching tube in the power topological circuit;
Switching tube in the power topological circuit is made corresponding switch according to the drive signal of accepting and is switched, and output voltage is the power supply of internal control circuit and loud speaker to backlight control and voltage transformation module simultaneously.
Preferably, the feedback end of described master power switch converter is specially: the feedback pin of pulse generation controller, pulse generation controller crystal oscillator control pin resistance terminal or pulse generation controller crystal oscillator control pin capacitance terminal.
Preferably, described pulse generation controller is PWM controller or PFM controller.
Preferably, described feed-forward module comprises: step-down submodule, filtering submodule, subtraction submodule and amplification submodule;
The input of step-down module connects the output of PFC module, is used for the output voltage of PFC module is carried out sending to the filtering submodule after the step-down;
The filtering submodule is used for the high fdrequency component of the voltage of filtering input, and filtered voltage is sent to the subtraction submodule;
The subtraction submodule is used for filtered voltage is deducted predetermined direct voltage, and the voltage signal that obtains is sent to the amplification submodule;
Amplify submodule, flow to the feedback end of master power switch converter after being used for the voltage signal that the subtraction submodule sends amplified.
Preferably, the step-down submodule comprises first divider resistance and second divider resistance;
The output of PFC module is by first divider resistance and the second divider resistance ground connection of series connection successively; Voltage on second divider resistance is as the output voltage of the PFC of filtering submodule collection;
The filtering submodule comprises first divider resistance and second divider resistance of step-down submodule, also comprises the filter capacitor that is connected in parallel on the second divider resistance two ends.
Preferably, described subtraction submodule and amplification submodule integrate.
Preferably, the subtraction submodule after integrated and amplify submodule and comprise: the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, second electric capacity, the 7th resistance and operational amplifier;
The negative input end of operational amplifier connects described predetermined direct voltage by the 3rd resistance;
The positive input terminal of operational amplifier connects the output of filtering submodule simultaneously by the 5th grounding through resistance by the 4th resistance;
The output of operational amplifier connects the feedback end of master power switch converter by the 7th resistance;
Be connected to second electric capacity in parallel and the 6th resistance between the output of operational amplifier and the negative input end.
Preferably, described feed-forward module also comprises voltage follower;
The negative input end of voltage follower connects the output of filtering submodule;
The output of voltage follower is by the positive input terminal of the 4th resistance concatenation operation amplifier;
The positive input terminal of voltage follower connects the output of voltage follower.
Preferably, described power topological circuit is PWM semi-bridge alternation circuit, PWM full-bridge circuit, LLC resonance full-bridge circuit or LLC resonance oscillation semi-bridge translation circuit.
Compared with prior art, the present invention has the following advantages:
Electric supply installation provided by the invention, between PFC module and master power switch converter, added feed-forward module, feed-forward module is gathered the output voltage of PFC module, thereby extract the power frequency ripple in the PFC module output voltage, generate the feed-forward control signals that characterizes the power frequency ripple, this feed-forward control signals is fed back to the master power switch converter.The change direction of master power switch convertor controls output gain is opposite with the fluctuation direction of feed-forward control signals.Avoiding with converter of auxiliary power supply like this is the power loss brought of assistant load power supply and the problem of electromagnetic interference.Because feed-forward control signals can characterize the power frequency ripple, therefore the amplitude of feed-forward control signals fluctuates according to power frequency ripple rule, can suppress the power frequency ripple so the fluctuation direction of the change direction of master power switch convertor controls output gain and power frequency ripple is opposite.The voltage of master power switch converter output can directly be the assistant load power supply like this.Because what the circuit in the master power switch converter adopted is soft switch circuit, can reduce electromagnetic interference like this, improve the operating efficiency of complete machine.
Description of drawings
Fig. 1 is the structure chart of electric supply installation in the prior art;
Fig. 2 is the structure chart of another kind of electric supply installation in the prior art;
Fig. 3 is embodiment one structure chart of electric supply installation provided by the invention;
Fig. 4 is the structure chart of feed-forward module provided by the invention;
Fig. 5 is another embodiment circuit diagram of feed-forward module provided by the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
The electric supply installation that the embodiment of the invention provides, between PFC module and master power switch converter, add feed-forward module, power frequency ripple in the output voltage of master power switch converter is inhibited, and like this, the output voltage of master power switch converter can directly be the assistant load power supply.
Referring to Fig. 3, this figure is embodiment one structure chart of the electric supply installation that provides of the embodiment of the invention.
The electric supply installation that the embodiment of the invention provides comprises: PFC module 301, feed-forward module 302, master power switch converter 303, backlight control and voltage transformation module 304 and converter of auxiliary power supply 305;
Wherein, master power switch converter 303 does not receive the feedback that self exports.
The input of PFC module 301 connects AC power supplies;
The output of PFC module 301 connects the input of master power switch converter 303, the input of boost voltage converter 305 and the input of feed-forward module 302 respectively;
Feed-forward module 302 is used to gather the output voltage of PFC module 301, generates the feed-forward control signals of power frequency ripple in the output voltage that characterizes PFC module 301, feed-forward control signals is exported to the feedback end of master power switch converter 303;
Master power switch converter 303, the change direction that is used to control output gain is opposite with the fluctuation direction of described feed-forward control signals, and it is part assistant load or all assistant load power supplies that output suppresses back voltage;
Need to prove that assistant load herein can be internal control circuit and loud speaker; Be understandable that internal control circuit comprises governor circuit and peripheral circuit, may need multiple voltage, for example 5V, 3.3V, 12V etc.
When master power switch converter 303 is powered for the part assistant load, for example, be the loud speaker power supply, exporting 12V simultaneously is the internal control circuit power supply; And 5V in the internal control circuit and 3.3V are by converter of auxiliary power supply 305 power supplies.
When master power switch converter 303 was powered for the part assistant load, principle was to be the power supply of the heavy load in the assistant load, and the little load in the remaining assistant load is by converter of auxiliary power supply 305 power supplies.
The output of master power switch converter 303 connects the input of backlight control and voltage transformation module 304;
Backlight control and voltage transformation module 304 are used to main electric.
When power consumption equipment was display, this main load can be backlight.
Electric supply installation provided by the invention, between PFC module 301 and master power switch converter 303, added feed-forward module 302, feed-forward module 302 is gathered the output voltage of PFC module 301, thereby extract the power frequency ripple in PFC module 301 output voltages, generate the feed-forward control signals that characterizes the power frequency ripple, this feed-forward control signals is fed back to master power switch converter 303.The change direction of master power switch converter 303 control output gains is opposite with the fluctuation direction of described feed-forward control signals, suppresses the power frequency ripple in the PFC output voltage, and the voltage after output suppresses is the assistant load power supply.Avoiding with converter of auxiliary power supply like this is the power loss brought of assistant load power supply and the problem of electromagnetic interference.Because feed-forward control signals can characterize the power frequency ripple, therefore the amplitude of feed-forward control signals fluctuates according to power frequency ripple rule, so master power switch converter 303 can suppress the power frequency ripple as long as the fluctuation direction of the change direction of control output gain and power frequency ripple is opposite.Because what the circuit in the master power switch converter adopted is soft switch circuit, can reduce electromagnetic interference like this, improve the operating efficiency of complete machine.
Need to prove that master power switch converter 303 comprises pulse generation controller, drive circuit and power topological circuit;
Pulse generation controller in the master power switch converter is accepted feed-forward control signals, sends the pulse signal of corresponding frequencies and duty ratio;
Drive circuit is accepted the pulse signal of pulse generation controller, produces the required drive signal of switching tube in the power topological circuit.
The switching tube of power topological circuit is made corresponding switch according to the drive signal of accepting and is switched, and then output voltage is to backlight control and voltage transformation module.
Because the amplitude of feed-forward control signals is according to the power frequency regular fluctuation, so the duty ratio of pulse generation controller or frequency also can cause power topological circuit output gain to do corresponding variation along with feed-forward control signals is done synchronous variation.Therefore, if the fluctuation direction of input voltage and the changing in the opposite direction of output gain of control master power switch converter then can suppress the power frequency ripple.
Wherein, described pulse generation controller can be PWM controller or PFM controller.
Wherein, described power topological circuit can be PWM semi-bridge alternation circuit, PWM full-bridge circuit, LLC resonance full-bridge circuit or LLC resonance oscillation semi-bridge translation circuit.These two kinds of circuit are the soft switch circuit of zero voltage switch (ZVS, Zero Voltage Switch), and its advantage is the energy transmission efficiency height.Therefore, most of power of system is by the efficient of master power switch converter transmission can raising system.
The feedback end of described master power switch converter is specifically as follows: the feedback pin of pulse generation controller, pulse generation controller crystal oscillator control pin resistance terminal or pulse generation controller crystal oscillator control pin capacitance terminal.For example, when the power topological circuit is a PWM semi-bridge alternation circuit, this feedback end can be the feedback pin of PWM controller; When the power topological circuit is a LLC resonance oscillation semi-bridge translation circuit, this feedback end can be the crystal oscillator control pin of PWM controller.
Describe the structure of the feed-forward module that the embodiment of the invention provides in detail below in conjunction with accompanying drawing, referring to Fig. 4, this figure is the structure chart of feed-forward module provided by the invention.
Feed-forward module comprises: step-down submodule 302a, filtering submodule 302b, subtraction submodule 302c and amplification submodule 302d;
The input of step-down submodule 302a connects the output of PFC module, is used for the output voltage of PFC module is carried out sending to filtering submodule 302b after the step-down;
Because the amplitude of the DC component of the voltage of PFC module output is higher, therefore, needs step-down submodule 302a that the output voltage of PFC module is reduced in the reasonable range.
Filtering submodule 302b is used for the high fdrequency component of the voltage of filtering input, and filtered voltage is sent to subtraction submodule 302c;
The effect of filtering submodule 302b mainly is the filtering high fdrequency component, keeps the power frequency component in the voltage.
Subtraction submodule 302c is used for filtered voltage is deducted predetermined direct voltage, the voltage signal that obtains is sent to amplify submodule 302d;
Amplify submodule 302d, flow to the feedback end of master power switch converter after being used for the voltage signal that subtraction submodule 302c sends amplified.
Below in conjunction with Fig. 5, introduce the specific implementation of feed-forward module in detail.
Referring to Fig. 5, this figure is another embodiment circuit diagram of the feed-forward module that provides of the embodiment of the invention.
The step-down submodule comprises the first divider resistance R and the second divider resistance R2;
The output of PFC module is by the first divider resistance R1 and the second divider resistance R2 ground connection of series connection successively; Voltage on the second divider resistance R2 is as the output voltage of the PFC module of filtering submodule collection;
The filtering submodule comprises the first divider resistance R1 and the second divider resistance R of step-down submodule, also comprises the filter capacitor C1 that is connected in parallel on the second divider resistance R2 two ends.
When the output voltage of PFC module exists, carry out filtering to ground through R1 and C1 successively, when the output voltage of PFC module did not exist, the voltage on the C1 carried out filtering through R2 to ground.
Subtraction submodule and amplification submodule integrate in the present embodiment.Subtraction submodule after integrated and amplification submodule comprise: the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, second capacitor C 2, the 7th resistance R 7 and operational amplifier U2;
The negative input end of operational amplifier U2 connects described predetermined direct voltage Vref by the 3rd resistance R 3;
The positive input terminal of operational amplifier U2 connects the output of filtering submodule simultaneously by the 5th resistance R 5 ground connection by the 4th resistance R 4;
The output of operational amplifier U2 connects the feedback end of master power switch converter by the 7th resistance R 7;
Be connected to second capacitor C 2 in parallel and the 6th resistance R 6 between the output of operational amplifier U2 and the negative input end.
Be understandable that subtraction submodule and amplify submodule and also can not integrate is realized by module independently respectively.
Need to prove that the feed-forward module that present embodiment provides also comprises voltage follower U1;
The negative input end of voltage follower U1 connects the output of filtering submodule;
The output of voltage follower U1 is by the positive input terminal of the 4th resistance R 4 concatenation operation amplifier U2;
The positive input terminal of voltage follower U1 connects the output of voltage follower U1.
The effect of voltage follower U1 is to make output impedance step-down, regulated output voltage.
Be understandable that, more than each module can realize by any circuit module of realizing this functions of modules, be not limited to above structure.
The master power switch converter that the embodiment of the invention provides does not carry out any FEEDBACK CONTROL to its output, but has added feed-forward module before the master power switch converter.
Backlight control that the embodiment of the invention provides and voltage transformation module can comprise booster circuit and constant-current circuit, are used to backlight that stable power is provided.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction.Though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention.Any those of ordinary skill in the art, do not breaking away under the technical solution of the present invention scope situation, all can utilize the method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention, all still belongs in the scope of technical solution of the present invention protection any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. an electric supply installation is characterized in that, comprising: power factor correction PFC module, feed-forward module, backlight control and voltage transformation module, converter of auxiliary power supply and the master power switch converter that does not receive self output feedback;
The input of PFC module connects AC power supplies, and the output of PFC module connects the input of master power switch converter and the input of feed-forward module respectively;
Feed-forward module is used to gather the output voltage of PFC module, generates the feed-forward control signals of power frequency ripple in the output voltage that characterizes the PFC module, feed-forward control signals is exported to the feedback end of master power switch converter;
The master power switch converter, the change direction that is used to control output gain is opposite with the fluctuation direction of described feed-forward control signals, and the voltage after output suppresses is part assistant load or all assistant load power supplies;
The input of backlight control and voltage transformation module connects the output of master power switch converter, and is main electric;
The input of described converter of auxiliary power supply connects the output of described PFC module, and being used for when the power consumption equipment standby is the power consumption equipment power supply; Simultaneously, when described master power switch converter was powered for the part assistant load, converter of auxiliary power supply was remaining assistant load power supply.
2. device according to claim 1 is characterized in that, described master power switch converter comprises pulse generation controller, drive circuit and power topological circuit;
The pulse generation controller is used to accept feed-forward control signals, sends the pulse signal of corresponding frequencies and duty ratio;
Drive circuit is used to accept the pulse signal of pulse generation controller, produces the required drive signal of switching tube in the power topological circuit;
Switching tube in the power topological circuit is made corresponding switch according to the drive signal of accepting and is switched, and output voltage is the power supply of internal control circuit and loud speaker to backlight control and voltage transformation module simultaneously.
3. device according to claim 2, it is characterized in that the feedback end of described master power switch converter is specially: the feedback pin of pulse generation controller, pulse generation controller crystal oscillator control pin resistance terminal or pulse generation controller crystal oscillator control pin capacitance terminal.
4. device according to claim 3 is characterized in that, described pulse generation controller is PWM controller or PFM controller.
5. device according to claim 1 is characterized in that, described feed-forward module comprises: step-down submodule, filtering submodule, subtraction submodule and amplification submodule;
The input of step-down module connects the output of PFC module, is used for the output voltage of PFC module is carried out sending to the filtering submodule after the step-down;
The filtering submodule is used for the high fdrequency component of the voltage of filtering input, and filtered voltage is sent to the subtraction submodule;
The subtraction submodule is used for filtered voltage is deducted predetermined direct voltage, and the voltage signal that obtains is sent to the amplification submodule;
Amplify submodule, flow to the feedback end of master power switch converter after being used for the voltage signal that the subtraction submodule sends amplified.
6. device according to claim 5 is characterized in that, the step-down submodule comprises first divider resistance and second divider resistance;
The output of PFC module is by first divider resistance and the second divider resistance ground connection of series connection successively; Voltage on second divider resistance is as the output voltage of the PFC of filtering submodule collection;
The filtering submodule comprises first divider resistance and second divider resistance of step-down submodule, also comprises the filter capacitor that is connected in parallel on the second divider resistance two ends.
7. device according to claim 5 is characterized in that, described subtraction submodule and amplification submodule integrate.
8. device according to claim 7 is characterized in that, the subtraction submodule after integrated and amplify submodule and comprise: the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, second electric capacity, the 7th resistance and operational amplifier;
The negative input end of operational amplifier connects described predetermined direct voltage by the 3rd resistance;
The positive input terminal of operational amplifier connects the output of filtering submodule simultaneously by the 5th grounding through resistance by the 4th resistance;
The output of operational amplifier connects the feedback end of master power switch converter by the 7th resistance;
Be connected to second electric capacity in parallel and the 6th resistance between the output of operational amplifier and the negative input end.
9. device according to claim 8 is characterized in that described feed-forward module also comprises voltage follower;
The negative input end of voltage follower connects the output of filtering submodule;
The output of voltage follower is by the positive input terminal of the 4th resistance concatenation operation amplifier;
The positive input terminal of voltage follower connects the output of voltage follower.
10. device according to claim 1 is characterized in that, described power topological circuit is PWM semi-bridge alternation circuit, PWM full-bridge circuit, LLC resonance full-bridge circuit or LLC resonance oscillation semi-bridge translation circuit.
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| CN2010106159155A CN102035366B (en) | 2010-12-30 | 2010-12-30 | Power supply device |
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| CN102902332A (en) * | 2011-07-26 | 2013-01-30 | 中国长城计算机深圳股份有限公司 | Computer and power circuit thereof |
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| CN104010148A (en) * | 2014-05-26 | 2014-08-27 | 深圳创维－Rgb电子有限公司 | Power circuit and television |
| CN104010148B (en) * | 2014-05-26 | 2017-03-08 | 深圳创维－Rgb电子有限公司 | Power circuit and television set |
| CN105050271A (en) * | 2015-07-31 | 2015-11-11 | 来安县新元机电设备设计有限公司 | Backlight control circuit, backlight drive circuit and display device |
| CN109149976A (en) * | 2017-06-15 | 2019-01-04 | 现代自动车株式会社 | For controlling the device of LLC converter |
| CN108181529B (en) * | 2018-01-08 | 2020-08-18 | 广东美的暖通设备有限公司 | Power supply control method, storage medium, device, circuit and power electronic equipment |
| CN108181529A (en) * | 2018-01-08 | 2018-06-19 | 广东美的暖通设备有限公司 | Method for controlling power supply, storage medium, device, circuit and power electronic equipment |
| CN108962205A (en) * | 2018-09-21 | 2018-12-07 | 孙彬 | A kind of intelligence projection KTV integral system |
| CN110061728A (en) * | 2019-05-27 | 2019-07-26 | 北京集创北方科技股份有限公司 | Top electrical resetting apparatus and electronic equipment |
| CN110061728B (en) * | 2019-05-27 | 2024-02-27 | 北京集创北方科技股份有限公司 | Power-on reset device and electronic equipment |
| CN111901932A (en) * | 2020-08-24 | 2020-11-06 | 海信视像科技股份有限公司 | Display device |
| CN111901932B (en) * | 2020-08-24 | 2022-11-29 | 海信视像科技股份有限公司 | Display device |
| CN113972702A (en) * | 2021-11-05 | 2022-01-25 | 锐捷网络股份有限公司 | Power supply device and power supply control method |
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Effective date of registration: 20210127 Address after: 1600 Zixing Road, Minhang District, Shanghai Patentee after: BCD (SHANGHAI) MICRO-ELECTRONICS Ltd. Address before: Ojinend house, South Church Street, George Town, Caymans Patentee before: BCD Semiconductor Manufacturing Ltd. |