CN101887298B - Power supply and embedded computer - Google Patents
Power supply and embedded computer Download PDFInfo
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- CN101887298B CN101887298B CN200910107315A CN200910107315A CN101887298B CN 101887298 B CN101887298 B CN 101887298B CN 200910107315 A CN200910107315 A CN 200910107315A CN 200910107315 A CN200910107315 A CN 200910107315A CN 101887298 B CN101887298 B CN 101887298B
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Abstract
The invention is applicable to the technical field of computers and provides a power supply and an embedded computer. The power supply comprises the input end of an input power supply, a +/-12v single-ended primary inductance converter, and a +/-5V synchronous buck converter, wherein the +/-12v single-ended primary inductance converter is connected with the input end and converts the input power supply into +12 v voltage and -12V voltage power supplies to be output; and the +/-5V synchronous buck converter is connected with the input end, and converts the input power supply into +5V voltage and -5V voltage power supplies to be output. In the power supply, the +/-5V synchronous buck converter is connected in parallel with the +/-12v single-ended primary inductance converter and the two converters independently work respectively, so that the power supply has the advantages of high efficiency, total power consumption reduction, and good reliability.
Description
Technical field
The invention belongs to the technical field of computing machine, relate in particular to a kind of supply unit and embedded computer.
Background technology
At present; The supply unit of embedded computer is as shown in Figure 1, it comprise input end 1, link to each other with input end 1+5V synchronous step-down converter 2, link to each other with+5V synchronous step-down converter 2-5V DC-DC modular transducer 3, link to each other+12V booster converter 4 with+5V synchronous step-down converter 2 and with+charge pump 5 that 12V booster converter 4 links to each other.From input end 1 input 6-40V DC voltage, after each transducer and charge pump conversion, respectively output-5V ,+5V ,-12V and+voltage of 12V.
But, because each transducer of present supply unit adopts cascade system to be connected with charge pump, therefore can cause the efficient of supply unit low, total power consumption is excessive, makes that the reliability of this supply unit is poor.
Summary of the invention
The object of the present invention is to provide a kind of supply unit of embedded computer, there is the poor problem of reliability in the supply unit that is intended to solve existing embedded computer.
The present invention is achieved in that a kind of supply unit, and it comprises the input end of importing power supply, and said supply unit also comprises:
Be connected with said input end ± 12V single ended primary induction transducer, it will be imported power source conversion and be+12V voltage and-12V voltage output; And
Be connected with said input end ± the 5V synchronous step-down converter, it will be imported power source conversion and be+5V voltage and-5V voltage output;
Said ± 12V single ended primary induction transducer comprises:
Be connected with said input end and will import first voltage conversion circuit of power source conversion for+12V voltage and-12V voltage output;
First overload protecting circuit that is connected with said first voltage conversion circuit; And
With said first voltage conversion circuit-first over-current overvoltage protector that the 12V voltage output end is connected;
The circuit structure of said ± 12V single ended primary induction transducer is:
Pwm chip U1, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, first inductance, second inductance, the 3rd inductance, first diode, second diode, first metal-oxide-semiconductor and first over-current overvoltage protector; The said input end of first termination of said first inductance; Second end of said first inductance connects the drain electrode of said first metal-oxide-semiconductor and first end of the 3rd electric capacity simultaneously; The grid of said first metal-oxide-semiconductor connects the switch door end of pwm chip U1; The source electrode of said first metal-oxide-semiconductor is leaded up to the 3rd resistance eutral grounding, and another road is connected with first end of second resistance, and second end of said second resistance is leaded up to second capacity earth; Another road connects the current detecting end of pwm chip U1; First end of the dutycycle control end of said pwm chip U1, earth terminal and first resistance is ground connection simultaneously, and the edge of the second termination pwm chip U1 of first resistance is by proofreading and correct end, and the primary power input end of said pwm chip U1 and switch drive power end are simultaneously through first capacity earth and connect dc power supply terminal simultaneously; Second end of said the 3rd electric capacity connects the anode of first diode and first end of the 6th electric capacity simultaneously; But also through the second inductance ground connection, the negative electrode of said first diode is+the 12V voltage output end, and it is the 4th resistance and the 5th resistance eutral grounding through said the 4th electric capacity, the 5th electric capacity, serial connection simultaneously; The tie point of said the 4th resistance and the 5th resistance is connected with the error amplifier input end of pwm chip U1; Second end of said the 6th electric capacity is leaded up to the second diode ground connection, and another road connects first end of the 3rd inductance, and second end of said the 3rd inductance is leaded up to the 7th capacity earth; Another road connects the input end of first over-current overvoltage protector; The earth terminal ground connection of said first over-current overvoltage protector, the output terminal of first over-current overvoltage protector are-the 12V voltage output end that the output terminal of said first over-current overvoltage protector is through the 8th capacity earth;
Said ± 5V synchronous step-down converter comprises:
Be connected with said input end and will import second voltage conversion circuit of power source conversion for+5V voltage and-5V voltage output;
Second overload protecting circuit that is connected with said second voltage conversion circuit; And
With said second voltage conversion circuit-second over-current overvoltage protector that the 5V voltage output end is connected.
The circuit structure of said ± 5V synchronous step-down converter is:
Pwm chip U2, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 4th inductance, the 5th inductance, the 3rd diode, the 4th diode, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and second over-current overvoltage protector; The drain electrode one tunnel of said the 3rd metal-oxide-semiconductor connects input end; Another road is through the 11 capacity earth, and the grid of said the 3rd metal-oxide-semiconductor connects the top margin switch drive end of pwm chip U2, and the source electrode of said the 3rd metal-oxide-semiconductor connects the drain electrode of first end and the 4th metal-oxide-semiconductor of the 4th inductance simultaneously; The source ground of said the 4th metal-oxide-semiconductor; The grid of said the 4th metal-oxide-semiconductor connects the base switch drive end of pwm chip U2, second end of said the 4th inductance lead up to the serial connection the 9th resistance and the 13 capacity earth, another road of second end of said the 4th inductance connects the second current detecting end of pwm chip U2; The tie point one tunnel of said the 9th resistance and the 13 electric capacity connects the first current detecting end of pwm chip U2; Another road is through the 14 capacity earth, and this tie point is+the 5V voltage output end that said the 5th inductance is connected with the 4th inductance reverse coupled; First end of said the 5th inductance is-the 5V voltage output end; First end of said the 5th inductance passes through the 12 capacity earth, the anode of second termination the 4th diode of said the 5th inductance, and the negative electrode of said the 4th diode connects the input end of second over-current overvoltage protector; The output head grounding of said second over-current overvoltage protector; The top power supply of said pwm chip U2 is supplied with the negative electrode that end one tunnel connects the 3rd diode, and another road connects the output of boosting through the 9th electric capacity and drives reference edge, and the anode one tunnel of said the 3rd diode connects the 12V power supply; Lead up to the tenth capacity earth; Another road connects the 12V power input of pwm chip U2 and first end of the 8th resistance simultaneously, the shutoff control end of the second termination pwm chip U2 of said the 8th resistance, the signal ground end ground connection of said pwm chip U2; Indirect the 6th resistance of the signal ground end of said pwm chip U2 and error amplifier input end, the error amplifier input end of said pwm chip U2 connect the first current detecting end of pwm chip U2 through the 7th resistance.
In the said structure, said supply unit also comprises:
With said ± 5V synchronous step-down converter+microfilter that the 5V output terminal links to each other.
Another object of the present invention is to provide a kind of embedded computer that comprises above-mentioned supply unit.
In the present invention; ± 5V synchronous step-down converter is connected with ± 12V single ended primary induction converter using parallel way; Above-mentioned two transducers work alone respectively, make that therefore the efficient of supply unit is high, have reduced total power consumption; All have overload protection function owing to above-mentioned two transducers in addition, so this supply unit reliability is relatively good.
Description of drawings
Fig. 1 is the structural drawing of the supply unit of existing embedded computer;
Fig. 2 is the structural drawing of the supply unit of the embedded computer that provides of the embodiment of the invention;
Fig. 3 is that the embodiment of the invention provides ± circuit structure diagram of 12V single ended primary induction transducer;
Fig. 4 is that the embodiment of the invention provides ± circuit structure diagram of 5V synchronous step-down converter.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 2 shows the structure of the supply unit of the embedded computer that the embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention.
The supply unit of embedded computer comprises the input end 100 of importing power supply, and supply unit also comprises: be connected with input end 100 ± 12V single ended primary induction transducer 200, it will be imported power source conversion and be+12V voltage and-12V voltage output; Be connected with input end 100 ± 5V synchronous step-down converter 300, it will be imported power source conversion and be+5V voltage and-5V voltage output; And with ± 5V synchronous step-down converter 300+microfilter 400 that the 5V output terminal links to each other.
As one embodiment of the invention, ± 12V single ended primary induction transducer 200 comprises: be connected with input end 100 and will import first voltage conversion circuit 201 of power source conversion for+12V voltage and-12V voltage output; First overload protecting circuit 202 that is connected with first voltage conversion circuit 201; And with first voltage conversion circuit 201-first over-current overvoltage protector 203 that the 12V voltage output end is connected.
± 5V synchronous step-down converter 300 comprises: be connected with input end 100 and will import second voltage conversion circuit 301 of power source conversion for+5V voltage and-5V voltage output; Second overload protecting circuit 302 that is connected with second voltage conversion circuit 301; And with second voltage conversion circuit 301-second over-current overvoltage protector 303 that the 5V voltage output end is connected.
Fig. 3 shows that the embodiment of the invention provides ± circuit structure of 12V single ended primary induction transducer, for the ease of explanation, only show the part relevant with the embodiment of the invention.
As one embodiment of the invention, ± 12V single ended primary induction transducer 200 comprises pwm chip U1, first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8, first inductance L 1, second inductance L 2, the 3rd inductance L 3, the first diode D1, the second diode D2, the first metal-oxide-semiconductor N1 and first over-current overvoltage protector 203.
The first termination input end 100 of first inductance L 1; Second end of first inductance L 1 connects the drain electrode of the first metal-oxide-semiconductor N1 and first end of the 3rd capacitor C 3 simultaneously; The grid of the first metal-oxide-semiconductor N1 meets the switch door end GATE of pwm chip U1; The source electrode of the first metal-oxide-semiconductor N1 is leaded up to the 3rd resistance R 3 ground connection, and another road is connected with first end of second resistance R 2, and second end of second resistance R 2 is leaded up to second capacitor C, 2 ground connection; Another road meets the current detecting end Isense of pwm chip U1; First end of the dutycycle control end Vsen of pwm chip U1, earth terminal PGND and first resistance R 1 is ground connection simultaneously, and the edge of the second termination pwm chip U1 of first resistance R 1 is by proofreading and correct end BLANK, and the primary power input end Vin1 of pwm chip U1 and switch drive power end Vin2 are simultaneously through first capacitor C, 1 ground connection and connect the 10V dc power supply terminal simultaneously; Second end of the 3rd capacitor C 3 connects the anode of the first diode D1 and first end of the 6th capacitor C 6 simultaneously; But also through second inductance L, 2 ground connection, the negative electrode of the first diode D1 be+the 12V voltage output end, and it is simultaneously through the 4th capacitor C 4, the 5th capacitor C 5, the 4th resistance R 4 and the 5th resistance R 5 ground connection that are connected in series; The tie point of the 4th resistance R 4 and the 5th resistance R 5 is connected with the error amplifier input end FB of pwm chip U1; Second end of the 6th capacitor C 6 is leaded up to the second diode D2 ground connection, and another road connects first end of the 3rd inductance L 3, and second end of the 3rd inductance L 3 is leaded up to the 7th capacitor C 7 ground connection; Another road connects the input end of first over-current overvoltage protector 203; The earth terminal ground connection of first over-current overvoltage protector 203, the output terminal of first over-current overvoltage protector 203 are-the 12V voltage output end that the output terminal of first over-current overvoltage protector 203 is through the 8th capacitor C 8 ground connection.
The course of work of ± 12V single ended primary induction transducer 200 is:
The variable pulse signal of the switch door end GATE output duty cycle of the pwm chip U1 of ± 12V single ended primary induction transducer 200 is to the grid of the first metal-oxide-semiconductor N1, and the first metal-oxide-semiconductor N1 is in conducting or off state under the control of pulse signal, when pulse signal is high level; The first metal-oxide-semiconductor N1 is in conducting state; From the power supply of input end 100 input through after the conversion, output+12V voltage and-12V voltage, when pulse signal is low level; The first metal-oxide-semiconductor N1 is in off state; Inductance capacitance in the ± 12V single ended primary induction transducer 200 discharges the electric weight that stores, through after the conversion, output+12V voltage and-12V voltage.
When output overloading; The sampling voltage at the 3rd resistance R 3 two ends is very big; After sampling voltage is input to pwm chip U1 from current detecting end Isense; Pwm chip U1 reduces from the dutycycle of the pulse signal of its switch door end GATE output, and the voltage of ± 12V single ended primary induction transducer 200 outputs reduces; When output short-circuit; The sampling voltage at the 3rd resistance R 3 two ends is very big; After sampling voltage was input to pwm chip U1 from current detecting end Isense, the dutycycle of the pulse signal of pwm chip U1 output was 0, and the voltage of ± 12V single ended primary induction transducer 200 outputs also is 0.
± 12V single ended primary induction transducer 200-the 12V voltage output end increases by first over-current overvoltage protector 203, guarantee to export to have excellent overcurrent and short-circuit protection ability.
Fig. 4 shows that the embodiment of the invention provides ± circuit structure of 5V synchronous step-down converter, for the ease of explanation, only show the part relevant with the embodiment of the invention.
As one embodiment of the invention, ± 5V synchronous step-down converter 300 comprises pwm chip U2, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the 9th capacitor C 9, the tenth capacitor C the 10, the 11 capacitor C the 11, the 12 capacitor C the 12, the 13 capacitor C the 13, the 14 capacitor C 14, the 4th inductance L 4, the 5th inductance L 5, the 3rd diode D3, the 4th diode D4, the 3rd metal-oxide-semiconductor N3, the 4th metal-oxide-semiconductor N4 and second over-current overvoltage protector 303.
The drain electrode one tunnel of the 3rd metal-oxide-semiconductor N3 connects input end 100; Another road is through the 11 capacitor C 11 ground connection, and the grid of the 3rd metal-oxide-semiconductor N3 meets the top margin switch drive end TG of pwm chip U2, and the source electrode of the 3rd metal-oxide-semiconductor N3 connects the drain electrode of first end and the 4th metal-oxide-semiconductor N4 of the 4th inductance L 4 simultaneously; The source ground of the 4th metal-oxide-semiconductor N4; The grid of the 4th metal-oxide-semiconductor N4 meets the base switch drive end BG of pwm chip U2, second end of the 4th inductance L 4 lead up to the serial connection the 9th resistance R 9 and the 13 capacitor C 13 ground connection, another road of second end of the 4th inductance L 4 meets the second current detecting end SENSE+ of pwm chip U2; The tie point one tunnel of the 9th resistance R 9 and the 13 capacitor C 13 meets the first current detecting end SENSE-of pwm chip U2; Another road is through the 14 capacitor C 14 ground connection, and this tie point is+the 5V voltage output end that the 5th inductance L 5 is connected with the 4th inductance L 4 reverse coupled; First end of the 5th inductance L 5 is-the 5V voltage output end; First end of the 5th inductance L 5 passes through the 12 capacitor C 12 ground connection, the anode of second termination the 4th diode D4 of the 5th inductance L 5, and the negative electrode of the 4th diode D4 connects the input end of second over-current overvoltage protector 303; The output head grounding of second over-current overvoltage protector 303; The top power supply of pwm chip U2 is supplied with the negative electrode that end Vboost one tunnel meets the 3rd diode D3, and another road connects the output of boosting through the 9th capacitor C 9 and drives reference edge TS, and the anode one tunnel of the 3rd diode D3 connects the 12V power supply; Lead up to the tenth capacitor C 10 ground connection; Another road connects the 12V power input 12Vin of pwm chip U2 and first end of the 8th resistance R 8 simultaneously, the shutoff control end RUN/SHDN of the second termination pwm chip U2 of the 8th resistance R 8, the signal ground end SGND ground connection of pwm chip U2; Indirect the 6th resistance R 6 of the signal ground end SGND of pwm chip U2 and error amplifier input end FB, the error amplifier input end FB of pwm chip U2 meets the first current detecting end SENSE-of pwm chip U2 through the 7th resistance R 7.
The course of work of ± 5V synchronous step-down converter 300 is:
The top margin switch drive end TG of the pwm chip U2 of ± 5V synchronous step-down converter 300 and base switch drive end BG export the grid of positive pulse and negative pulse to the three metal-oxide-semiconductor N3 and the grid of the 4th metal-oxide-semiconductor N4 respectively; Make the 3rd metal-oxide-semiconductor N3 conducting, the 4th metal-oxide-semiconductor N4 turn-off; Give the 13 capacitor C 13 and 14 chargings of the 14 capacitor C from the power supply of input end 100 input through the 4th inductance L 4, the 9th resistance R 9; When the sampling voltage at the 9th resistance R 9 two ends resets even as big as making the inner RS latch of pwm chip U2; Pwm chip U2 turn-offs the 3rd metal-oxide-semiconductor N3, makes the 4th metal-oxide-semiconductor N4 conducting, and said process goes round and begins again; Promote and keep+5V voltage normally exports, through the anti-violent change generation-5V voltage of the 5th inductance L 5.
When output overloading; The sampling voltage at the 9th resistance R 9 two ends is very big; After sampling voltage is input to pwm chip U2 from the first current detecting end SENSE-, the second current detecting end SENSE+ and error amplifier input end FB; The dutycycle of the pulse signal that pwm chip U2 reduces to export, the voltage of ± 5V synchronous step-down converter 300 outputs reduces; When output short-circuit; The sampling voltage at the 9th resistance R 9 two ends is very big; After sampling voltage is input to pwm chip U2 from the first current detecting end SENSE-, the second current detecting end SENSE+ and error amplifier input end FB; The dutycycle of the pulse signal of pwm chip U2 output is 0, and the voltage of ± 5V synchronous step-down converter 300 outputs also is 0.
± 5V synchronous step-down converter 300-the 5V voltage output end increases by second over-current overvoltage protector 303, guarantee to export to have excellent overcurrent and short-circuit protection ability.
In embodiments of the present invention; ± 5V synchronous step-down converter is connected with ± 12V single ended primary induction converter using parallel way, and above-mentioned two transducers work alone respectively, makes that therefore the efficient of supply unit is high; Reduced total power consumption; All have overload protection function owing to above-mentioned two transducers in addition, so this supply unit is not fragile, reliability is relatively good.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. supply unit, it comprises the input end of importing power supply, it is characterized in that, said supply unit also comprises:
Be connected with said input end ± 12V single ended primary induction transducer, it will be imported power source conversion and be+12V voltage and-12V voltage output; And
Be connected with said input end ± the 5V synchronous step-down converter, it will be imported power source conversion and be+5V voltage and-5V voltage output;
Said ± 12V single ended primary induction transducer comprises:
Be connected with said input end and will import first voltage conversion circuit of power source conversion for+12V voltage and-12V voltage output;
First overload protecting circuit that is connected with said first voltage conversion circuit; And
With said first voltage conversion circuit-first over-current overvoltage protector that the 12V voltage output end is connected;
The circuit structure of said ± 12V single ended primary induction transducer is:
Pwm chip U1, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, first inductance, second inductance, the 3rd inductance, first diode, second diode, first metal-oxide-semiconductor and first over-current overvoltage protector; The said input end of first termination of said first inductance; Second end of said first inductance connects the drain electrode of said first metal-oxide-semiconductor and first end of the 3rd electric capacity simultaneously; The grid of said first metal-oxide-semiconductor connects the switch door end of pwm chip U1; The source electrode of said first metal-oxide-semiconductor is leaded up to the 3rd resistance eutral grounding, and another road is connected with first end of second resistance, and second end of said second resistance is leaded up to second capacity earth; Another road connects the current detecting end of pwm chip U1; First end of the dutycycle control end of said pwm chip U1, earth terminal and first resistance is ground connection simultaneously, and the edge of the second termination pwm chip U1 of first resistance is by proofreading and correct end, and the primary power input end of said pwm chip U1 and switch drive power end are simultaneously through first capacity earth and connect dc power supply terminal simultaneously; Second end of said the 3rd electric capacity connects the anode of first diode and first end of the 6th electric capacity simultaneously; But also through the second inductance ground connection, the negative electrode of said first diode is+the 12V voltage output end, and it is the 4th resistance and the 5th resistance eutral grounding through said the 4th electric capacity, the 5th electric capacity, serial connection simultaneously; The tie point of said the 4th resistance and the 5th resistance is connected with the error amplifier input end of pwm chip U1; Second end of said the 6th electric capacity is leaded up to the second diode ground connection, and another road connects first end of the 3rd inductance, and second end of said the 3rd inductance is leaded up to the 7th capacity earth; Another road connects the input end of first over-current overvoltage protector; The earth terminal ground connection of said first over-current overvoltage protector, the output terminal of first over-current overvoltage protector are-the 12V voltage output end that the output terminal of said first over-current overvoltage protector is through the 8th capacity earth;
Said ± 5V synchronous step-down converter comprises:
Be connected with said input end and will import second voltage conversion circuit of power source conversion for+5V voltage and-5V voltage output;
Second overload protecting circuit that is connected with said second voltage conversion circuit; And
With said second voltage conversion circuit-second over-current overvoltage protector that the 5V voltage output end is connected;
The circuit structure of said ± 5V synchronous step-down converter is:
Pwm chip U2, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 4th inductance, the 5th inductance, the 3rd diode, the 4th diode, the 3rd metal-oxide-semiconductor, the 4th metal-oxide-semiconductor and second over-current overvoltage protector; The drain electrode one tunnel of said the 3rd metal-oxide-semiconductor connects input end; Another road is through the 11 capacity earth, and the grid of said the 3rd metal-oxide-semiconductor connects the top margin switch drive end of pwm chip U2, and the source electrode of said the 3rd metal-oxide-semiconductor connects the drain electrode of first end and the 4th metal-oxide-semiconductor of the 4th inductance simultaneously; The source ground of said the 4th metal-oxide-semiconductor; The grid of said the 4th metal-oxide-semiconductor connects the base switch drive end of pwm chip U2, second end of said the 4th inductance lead up to the serial connection the 9th resistance and the 13 capacity earth, another road of second end of said the 4th inductance connects the second current detecting end of pwm chip U2; The tie point one tunnel of said the 9th resistance and the 13 electric capacity connects the first current detecting end of pwm chip U2; Another road is through the 14 capacity earth, and this tie point is+the 5V voltage output end that said the 5th inductance is connected with the 4th inductance reverse coupled; First end of said the 5th inductance is-the 5V voltage output end; First end of said the 5th inductance passes through the 12 capacity earth, the anode of second termination the 4th diode of said the 5th inductance, and the negative electrode of said the 4th diode connects the input end of second over-current overvoltage protector; The output head grounding of said second over-current overvoltage protector; The top power supply of said pwm chip U2 is supplied with the negative electrode that end one tunnel connects the 3rd diode, and another road connects the output of boosting through the 9th electric capacity and drives reference edge, and the anode one tunnel of said the 3rd diode connects the 12V power supply; Lead up to the tenth capacity earth; Another road connects the 12V power input of pwm chip U2 and first end of the 8th resistance simultaneously, the shutoff control end of the second termination pwm chip U2 of said the 8th resistance, the signal ground end ground connection of said pwm chip U2; Indirect the 6th resistance of the signal ground end of said pwm chip U2 and error amplifier input end, the error amplifier input end of said pwm chip U2 connect the first current detecting end of pwm chip U2 through the 7th resistance.
2. supply unit as claimed in claim 1 is characterized in that, said supply unit also comprises:
With said ± 5V synchronous step-down converter+microfilter that the 5V output terminal links to each other.
3. an embedded computer is characterized in that, said embedded computer comprises each described supply unit of claim 1-2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910107315A CN101887298B (en) | 2009-05-12 | 2009-05-12 | Power supply and embedded computer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910107315A CN101887298B (en) | 2009-05-12 | 2009-05-12 | Power supply and embedded computer |
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| CN101887298A CN101887298A (en) | 2010-11-17 |
| CN101887298B true CN101887298B (en) | 2012-09-26 |
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| CN102570573A (en) * | 2011-12-31 | 2012-07-11 | 成都市华为赛门铁克科技有限公司 | Power supply method and system as well as power supply |
| CN108233699A (en) * | 2017-07-31 | 2018-06-29 | 珠海市魅族科技有限公司 | A kind of power management chip, electric power system and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2747778Y (en) * | 2004-05-31 | 2005-12-21 | 上海德创电器电子有限公司 | Modular power source of power system |
| CN201142050Y (en) * | 2007-11-30 | 2008-10-29 | 上海云骅电子科技有限公司 | Computer electric power |
| CN201417424Y (en) * | 2009-05-12 | 2010-03-03 | 杨延辉 | Power supply device and embedded computer |
-
2009
- 2009-05-12 CN CN200910107315A patent/CN101887298B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2747778Y (en) * | 2004-05-31 | 2005-12-21 | 上海德创电器电子有限公司 | Modular power source of power system |
| CN201142050Y (en) * | 2007-11-30 | 2008-10-29 | 上海云骅电子科技有限公司 | Computer electric power |
| CN201417424Y (en) * | 2009-05-12 | 2010-03-03 | 杨延辉 | Power supply device and embedded computer |
Non-Patent Citations (1)
| Title |
|---|
| JP特開2007-206462A 2007.08.16 |
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