CN202231629U - Power adapter of all-in-one computer - Google Patents

Power adapter of all-in-one computer Download PDF

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Publication number
CN202231629U
CN202231629U CN2011203481166U CN201120348116U CN202231629U CN 202231629 U CN202231629 U CN 202231629U CN 2011203481166 U CN2011203481166 U CN 2011203481166U CN 201120348116 U CN201120348116 U CN 201120348116U CN 202231629 U CN202231629 U CN 202231629U
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China
Prior art keywords
unit
output
voltage
power supply
frequency
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Expired - Fee Related
Application number
CN2011203481166U
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Chinese (zh)
Inventor
厉天福
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NIVS INTELLIMEDIA TECHNOLOGY GROUP Inc
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NIVS INTELLIMEDIA TECHNOLOGY GROUP Inc
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Priority to CN2011203481166U priority Critical patent/CN202231629U/en
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Publication of CN202231629U publication Critical patent/CN202231629U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model relates to a power adapter circuit of an all-in-one computer. The power adapter of an all-in-one computer comprises an input rectification filtering unit, a high frequency conversion unit, a high frequency isolation transformer unit and an output rectification filtering unit, all of which are connected in order. The power adapter circuit of an all-in-one computer also comprises a PWM control unit and an output voltage sampling unit. Output terminal voltage is sampled by the output voltage sampling unit and is then feedback to the PWM control unit. Appropriate switch frequency is output by the PWM control unit to a power switch assembly in the high frequency conversion unit for adjustment of the switch time proportion of the power switch assembly. Therefore, the stability of output voltage is ensured and the energy efficiency ratio under different loads is guaranteed. According to the power adapter, under a full load situation, a control power switch frequency is increased; under a light load situation, peak value current is decreased and then the control power switch frequency is decreased, thereby effectively restricting the problem of noise of a conventional power adapter; and under the light load situation, loss related with the switch frequency is also minimized, thereby improving the energy efficiency of a switch power supply under the light load situation.

Description

The computer all-in-one machine power supply adaptor
Technical field
The utility model relates to a kind of power circuit, specifically is meant a kind of computer all-in-one machine power supply adaptor circuit.
Background technology
Develop rapidly along with electronics and information industry; The application scenario of power supply adaptor is extensive day by day, to its performance demands increasingly stringent that also becomes, comprises the requirement to its efficient; Particularly along with the raising of whole world awareness of saving energy, very strict requirement has been proposed also for the efficient of power supply.The anti-power supply that swashs topological structure; The work of employing fixed switching frequency; The mode of operation aspect can be continuous conduction mode (CCM) or discontinuous conduction mode (DCM), and its underloading efficiency and fully loaded efficiency all are in more among a small circle, is difficult to satisfy growing energy conservation and environment protection; And switching tube turn-offs when maximum current, bears big electric current and high voltage during shutoff, and turn-off power loss is bigger.
Summary of the invention
The problem that the utility model need solve provides a kind of power supply adaptor of energy-efficient and stable performance.
The technical scheme that the utility model is taked is: a kind of computer all-in-one machine power supply adaptor; Comprise the input rectifying filter unit, high frequency conversion unit, high-frequency isolation transformer unit, the output rectification filtering unit that connect successively; It is characterized in that: also comprise PWM control unit, output voltage sampling unit; Said output voltage sampling unit is sampled to output end voltage and it is fed back to the PWM control unit; Regulate ratio switching time of power switch module for the power switch assembly in the high frequency conversion unit by the suitable switching frequency of PWM control unit output, and then guarantee the stable Energy Efficiency Ratio that reaches under the different loads situation of output voltage.
Said power supply adaptor also comprises the over-current protecting unit that is connected with the high frequency conversion unit; Said over-current protecting unit comprises sampling resistor, and sampling resistor suppresses the control chip that resistance R 6 is connected to the PWM control unit through peak current; Then trigger the protection of control chip internal over-current when the excessive voltage on sampling resistor of output current surpasses setting voltage, control chip output output low level power controlling switching tube turn-offs.
Said power supply adaptor also comprises overvoltage crowbar; This circuit is by the auxiliary winding induction of the transformer in high-frequency isolation transformer unit output winding voltage; This power supply is delivered to the control chip of PWM control unit behind electric resistance partial pressure; When dividing point voltage surpasses set point, the output of control chip shutdown switch pulse voltage, control chip supply pin voltage also reduces the locking of realization power supply adaptor simultaneously.
Said power supply adaptor further comprises the electromagnetic interface filter that is connected between alternating current input power supplying and the input rectifying filter unit.
Compared with prior art, the beneficial effect of the utility model is:
(1) said power supply adaptor is under full load conditions, and the power controlling switching frequency increases, until running into sequential electric capacity clamper; And under the underloading condition, peak current reduces, and then the power controlling switching frequency descends, and has effectively limited the problem of existing power supply adapter noise; When underloading, because the decline of switching frequency, the loss relevant with switching frequency also can reduce like power switch pipe output capacitance and door charge loss and the loss of leakage induction reactance, and the efficiency of Switching Power Supply under the underloading condition also improved thereupon; (2) said power supply adaptor utilizes quasi-resonance flyback switching converter principle, and has additional overvoltage crowbar, current foldback circuit, feedback compensation circuit, can improve the reliability and the input voltage range of Switching Power Supply effectively, reduces EMI, reduces the wastage.
Description of drawings
Fig. 1 forms schematic block diagram for the utility model principle;
Fig. 2 is the utility model embodiment circuit theory sketch map.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the utility model is done further to specify below in conjunction with embodiment and accompanying drawing.
The said power supply adaptor of the utility model adopts quasi-resonance multi-mode topological structure, and switching frequency is variable, its fully loaded CCM and QR pattern efficiency the best of being operated in, and it is best to be operated in BURST pattern efficiency during underloading.As shown in Figure 1, it comprises electromagnetic interface filter, input rectifying filter unit, high frequency conversion unit, high-frequency isolation transformer unit and the output rectification filtering unit that connects successively; Electromagnetic interface filter is connected with AC power.AC power to eliminate electromagnetic interference and radio frequency interference, becomes the direct voltage that contains certain pulsating voltage composition through the input rectifying filter unit earlier through electromagnetic interface filter again, gets into the high frequency conversion unit then; The core of high frequency conversion unit is a high frequency power switch module, like switching transistor or FET (MOSFET).The high frequency conversion unit produces high frequency (more than the 20KHZ) high-voltage square-wave, and resulting high-voltage square-wave is given the elementary of high-frequency isolation transformer unit, and then the secondary induction at isolating transformer goes out voltage, and this voltage has become low-voltage DC after by rectifying and wave-filtering.Pulse-width modulator (PWM) is mainly used in the adjusting output voltage; Make that it is stable that output voltage can keep when input AC changes with the output DC load, operation is that pwm circuit passes through the output voltage sampling; And a result of sampling feeds back to control circuit; Control circuit is made comparisons it and reference voltage, controls ratio switching time (duty ratio) of high frequency power switch module according to comparative result, reaches the purpose of adjustment output voltage.For entire circuit is worked safely and reliably, auxiliary circuits such as overvoltage, current foldback circuit must be set.
As shown in Figure 2, during practical implementation, the output voltage sampling unit comprises resistance R 14, R12, R15 and reference power supply IC2, optocoupler IC3; When output voltage raises; Resistance R 15 powers on and presses liter; The output after reference power supply IC2 sampling is amplified of this voltage drives optocoupler IC3; And then the 2 pin voltages of the control chip IC1A in the PWM control unit are descended, and then IC1A 5 pin output LOW voltages reduce the elementary winding stored energy of transformer T101 in the high-frequency isolation transformer unit, and transformer T101 secondary coil voltage descends and output voltage is descended; Otherwise when output voltage reduces then.
Like Fig. 2, said over-current protecting unit comprises resistance 7RA, 7RB, 7RC, suppresses resistance R 6 through peak current after resistance 7RA, 7RB, the 7RC parallel connection and is connected to control chip IC1A 3 pin; Then trigger the protection of control chip IC1A internal over-current when the excessive voltage on resistance 7RA 7RB7RC of output current surpasses setting voltage, control chip IC1A 5 pin output low level power controlling switching tubes turn-off.
Like Fig. 2; Said overvoltage crowbar comprises that transformer T101 assists winding N3; The auxiliary winding N3 induction of transformer T101 output winding voltage, this power supply is delivered to 1 pin of control chip IC1A after resistance R 8, R5 dividing potential drop, when dividing point voltage surpasses set point; The output of control chip shutdown switch pulse voltage, control chip IC1A 6 pin voltages also reduce the locking of realization power supply adaptor simultaneously.
The said power supply adaptor of the utility model utilizes quasi-resonance flyback switching converter principle; The key of quasi-resonance is a FET (MOSFET) in the conducting when source voltage (VDS) reaches its minimum that drains, thereby reduces switching loss and improve the electromagnetic interference (EMI) of circuit.When load descended, the control FET kept locking in certain the lowest point, declines to a great extent up to power output, changes the lowest point then.When power output was reduced to certain value, power supply adaptor got into the voltage controlled oscillator pattern.Particularly, the feedback comparator can be selected the lowest point, and information is passed to counter, and the hysteresis characteristic of feedback comparator just locks the lowest point.This method provides the switching frequency restriction of nature when system load reduces, the lowest point frequency hopping noise can not occur, and not reduce efficiency.
Need to prove, more than be merely the utility model preferred embodiment, do not breaking away under the utility model design prerequisite any impartial protection range of in the prior art scope, the utility model circuit being done that all belongs to the utility model with modification that changes.

Claims (5)

1. computer all-in-one machine power supply adaptor; Comprise the input rectifying filter unit, high frequency conversion unit, high-frequency isolation transformer unit, the output rectification filtering unit that connect successively; It is characterized in that: also comprise PWM control unit, output voltage sampling unit; Said output voltage sampling unit is sampled to output end voltage and it is fed back to the PWM control unit; Regulate ratio switching time of power switch module for the power switch assembly in the high frequency conversion unit by the suitable switching frequency of PWM control unit output, and then guarantee the stable Energy Efficiency Ratio that reaches under the different loads situation of output voltage.
2. computer all-in-one machine power supply adaptor according to claim 1 is characterized in that: said output voltage sampling unit comprises resistance R 14, R12, R15 and reference power supply IC2, optocoupler IC3; When output voltage raises; Resistance R 15 powers on and presses liter; The output after reference power supply IC2 sampling is amplified of this voltage drives optocoupler IC3; And then the 2 pin voltages of the control chip IC1A in the PWM control unit are descended, and then IC1A 5 pin output LOW voltages reduce the elementary winding stored energy of transformer T101 in the high-frequency isolation transformer unit, and transformer T101 secondary coil voltage descends and output voltage is descended; Otherwise when output voltage reduces then.
3. computer all-in-one machine power supply adaptor according to claim 2 is characterized in that: also comprise the over-current protecting unit that is connected with the high frequency conversion unit; Said over-current protecting unit comprises resistance 7RA, 7RB, 7RC, suppresses resistance R 6 through peak current after resistance 7RA, 7RB, the 7RC parallel connection and is connected to control chip IC1A 3 pin; Then trigger the protection of control chip IC1A internal over-current when the excessive voltage on resistance 7RA 7RB 7RC of output current surpasses setting voltage, control chip IC1A 5 pin output low level power controlling switching tubes turn-off.
4. computer all-in-one machine power supply adaptor according to claim 3; It is characterized in that: also comprise overvoltage crowbar; Said overvoltage crowbar comprises that transformer T101 assists winding N3; The auxiliary winding N3 induction of transformer T101 output winding voltage, this power supply is delivered to 1 pin of control chip IC1A after resistance R 8, R5 dividing potential drop, when dividing point voltage surpasses set point; The output of control chip shutdown switch pulse voltage, control chip IC1A 6 pin voltages also reduce the locking of realization power supply adaptor simultaneously.
5. computer all-in-one machine power supply adaptor according to claim 4 is characterized in that: further comprise the electromagnetic interface filter that is connected between alternating current input power supplying and the input rectifying filter unit.
CN2011203481166U 2011-09-16 2011-09-16 Power adapter of all-in-one computer Expired - Fee Related CN202231629U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011203481166U CN202231629U (en) 2011-09-16 2011-09-16 Power adapter of all-in-one computer

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Application Number Priority Date Filing Date Title
CN2011203481166U CN202231629U (en) 2011-09-16 2011-09-16 Power adapter of all-in-one computer

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CN202231629U true CN202231629U (en) 2012-05-23

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684505A (en) * 2012-06-05 2012-09-19 天津三星电子有限公司 Power adapter
CN104575401A (en) * 2013-10-29 2015-04-29 惠科电子(深圳)有限公司 Two-in-one power source for LED backlight and LED backlight display
CN104980048A (en) * 2015-08-08 2015-10-14 张新安 Power adapter with low cost
CN110855156A (en) * 2019-12-10 2020-02-28 常州格力博有限公司 Flyback switching power supply

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684505A (en) * 2012-06-05 2012-09-19 天津三星电子有限公司 Power adapter
CN104575401A (en) * 2013-10-29 2015-04-29 惠科电子(深圳)有限公司 Two-in-one power source for LED backlight and LED backlight display
CN104575401B (en) * 2013-10-29 2017-02-22 惠科股份有限公司 Two-in-one power source for LED backlight and LED backlight display
CN104980048A (en) * 2015-08-08 2015-10-14 张新安 Power adapter with low cost
CN110855156A (en) * 2019-12-10 2020-02-28 常州格力博有限公司 Flyback switching power supply
CN110855156B (en) * 2019-12-10 2021-04-16 格力博(江苏)股份有限公司 Flyback switching power supply

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120523

Termination date: 20120916

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