CN101789695B - Power supply changeover method and circuit thereof - Google Patents
Power supply changeover method and circuit thereof Download PDFInfo
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- CN101789695B CN101789695B CN2010101299084A CN201010129908A CN101789695B CN 101789695 B CN101789695 B CN 101789695B CN 2010101299084 A CN2010101299084 A CN 2010101299084A CN 201010129908 A CN201010129908 A CN 201010129908A CN 101789695 B CN101789695 B CN 101789695B
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Abstract
The invention discloses a power supply changeover method which can realize power supply changeover from a power input end to a power output end. The power supply changeover method comprises the steps of: inputting power signals from the power input end by a switch unit; controlling the current magnitude of the power output end by a sampling unit; starting a drive unit by a processing unit; outputting changeover voltage by a drive unit after carrying out voltage changeover on the input power signals; feeding the signals of the changeover voltage back to the processing unit by a feedback unit; judging whether the changeover voltage is normal by the processing unit according to the information of the changeover voltage; if the changeover voltage is normal, outputting power; and if the changeover voltage is abnormal, stopping outputting power. The invention also discloses a power supply changeover circuit. The power supply changeover method and the circuit thereof have the advantage of improving the reliability and safety of sequent circuit power supply application through carrying out real time detection on the power output end by the feedback circuit and immediate control on the power supply output by the processing unit.
Description
[technical field]
The present invention relates to the power supply of medicine equipment, relate in particular to a kind of power conversion method and circuit thereof.
[background technology]
In medicine equipment electronic product field, power supply is one of important composition parts of product.The driving force of power supply, radiating efficiency, reliability and fail safe are to stability, reliability and the equal important influence of complete machine performance of work such as electromagnetically operated valve and transducer.
At present; The electro-medical power-switching circuit mostly adopts the DC-DC change-over circuit, is about to a kind of DC power supply and converts another kind of DC power supply to, and the amplitude of supply voltage changes to some extent before and after the conversion; Possibly with voltage transitions the voltage of higher magnitude promptly than low amplitude value, so-called boost DC-DC circuit; Also maybe the voltage transitions of higher magnitude be become the voltage than low amplitude value, so-called buck DC-DC circuit.Be illustrated in figure 5 as the buck DC-DC circuit; This circuit is made up of devices such as process chip U1, switching tube M1, sustained diode 1 and capacitance-resistances; This circuit can realize that High Level DC Voltage arrives the conversion of low-voltage; Input voltage range 5.3V-28V is guaranteeing that under the enough situation of input current, the output driving force can reach 5V/3A.
Test shows that the driving force of this circuit is limited, if the driving force of need of load 5V/5A, electric voltage dropping is serious, can not satisfy power reguirements; The radiating efficiency of circuit is lower, and the heat of this change-over circuit produces and concentrates on switching tube M1, and when circuit working, the temperature of switching tube M1 raises rapidly, and is all unfavorable with heat radiation to the reliability of device, and high heat influences the accuracy of built-in sensor; The reliability of power supply and fail safe are difficult to guarantee that if cause source voltage directly to output to output unusually, output just presents higher voltage so, damages follow-up chip device, perhaps cause machine control chaotic, injure patient's safety.
Prior art need be improved and improve.
[summary of the invention]
The technical problem that the present invention will solve provides a kind of power conversion method that can effectively improve fail safe and based on the circuit of this method.
The present invention provides a kind of power conversion method, realizes the power source conversion from the power input to the power output end, and comprising: switch element is imported power supply signal from power input; The size of current of sampling unit control power output end; Processing unit starts driver element; Driver element carries out exporting changing voltage after the voltage transitions to the power supply signal of input; Feedback unit with the feedback information of changing voltage to processing unit; Processing unit judges according to the information of changing voltage whether changing voltage is normal; If normal, then carry out power supply output; If unusual, then stop power supply output.
As further improvement of the present invention, the output changing voltage also comprised after driver element carried out voltage transitions to the power supply signal of importing: power supply inputs to complementary power amplification circuit; Said complementary power amplification circuit amplifies voltage, and the output changing voltage; Driving tube Q4 and driving tube Q5 import said changing voltage simultaneously, and the said changing voltage of back output dispels the heat.
As further improvement of the present invention, also comprise: the output voltage of AD sampling unit monitoring power output end; Said AD sampling unit feeds back said output voltage to control unit; Said control unit judges whether said output voltage is normal; If normal, then control said processing unit and carry out power supply output; If undesired, then control said switch element power off signal input, stop power supply output.
The present invention also provides a kind of power-switching circuit, realizes the power source conversion from the power input to the power output end, comprising: switch element is connected in power input, the input and the disconnection of control power supply signal; Sampling unit is connected in said switch element, the size of current of control power output end; Driver element is connected in said sampling unit, and said power supply signal is carried out exporting changing voltage after the voltage transitions; Processing unit is connected between said sampling unit and the said unit, is used to control enabling of said driver element; Feedback unit is connected in said driver element and said processing unit, exports feedback information to the said processing unit of said changing voltage.
The present invention's beneficial effect compared with prior art is:
(1) the present invention adopts feedback unit that power output end is detected in real time, and in time feeds back to processing unit, by processing unit driver element is controlled, and has improved the reliability and the fail safe of subsequent conditioning circuit application of power;
(2) the present invention adopts complementary power amplification circuit in driver element, has improved the driving force and the reliability of driver element;
(3) the present invention adopts a plurality of driving tube heat radiations in driver element, has improved the radiating effect of driver element.
[description of drawings]
Fig. 1 is the system diagram of a kind of execution mode of power conversion method of the present invention;
Fig. 2 is the flow chart of a kind of execution mode of power conversion method of the present invention;
Fig. 3 is the circuit diagram of first kind of execution mode of power-switching circuit of the present invention;
Fig. 4 is the circuit diagram of second kind of execution mode of power-switching circuit of the present invention;
Fig. 5 is the circuit diagram of power-switching circuit prior art of the present invention.
[embodiment]
Do further explain below in conjunction with accompanying drawing and execution mode of the present invention.
Fig. 1 is the system diagram of a kind of execution mode of power conversion method of the present invention.This execution mode comprises that this execution mode comprises switch element 10, sampling unit 20, processing unit 50, driver element 30 and feedback unit 40.Switch element 10 is connected in power input Vin, and feedback unit 40 is connected in power output end Vout.
In this execution mode, the access of switch element 10 control dc supply input Vin, if output abnormality occurs, then disconnecting external is imported power supply.Sampling unit 20 provides sample resistance R1, the maximum output current of this sample resistance R1 control power output end Vout.Driver element 30 is realized the control of output power supply capacity, and suitable out-put supply is provided.Information to the processing unit 50 of feedback unit 40 feedback output voltages is by the operating state of processing unit 50 control drive unit 30.
This execution mode can also comprise control unit 70, is connected in switch element 10 and processing unit 50, according to the operating state of manual operation or circuit control information Control switch element 10 and processing unit 50.
This execution mode can also comprise that AD sampling unit 60 is connected between power output end Vout and the control unit 70; Monitor the voltage of power output end Vout in real time; And feed back to control unit 70, by the operating state of control unit 70 control switch unit 10 with processing unit 50.
Fig. 2 is the flow chart of a kind of execution mode of power conversion method of the present invention.In step S100, switch element 10 is from power input Vin input power supply signal.
In step S102, the electric current of sampling unit 20 control power output end Vout.
In step S104, processing unit 50 starts driver element 30.
In step S106, the power supply signal of 30 pairs of inputs of driver element carries out exporting changing voltage after the voltage transitions.Be specially: power supply signal inputs to complementary power amplification circuit; Complementary power amplification circuit amplifies voltage, and the output changing voltage; Driving tube Q4 and driving tube Q5 import changing voltage simultaneously, and back output changing voltage dispels the heat.
In step S108, feedback unit 40 is with feedback information to the processing unit 50 of changing voltage.
In step S110, processing unit 50 judges according to the information of changing voltage whether changing voltage is normal.
If normal, then return in step S104, control power output end Vout carries out power supply output, and be specially: processing unit 50 starts driver element 30 according to control signal; Driver element 30 is accomplished voltage transitions and is carried out power supply output.
If unusual, then in step S112, stop power supply output, be specially: processing unit 50 breaks off driver element 30 according to control signal; Driver element 30 stops voltage transitions and stops power supply output.
In this execution mode, also comprise the output voltage of AD sampling unit 60 monitoring power output ends; AD sampling unit 60 feedback output voltages are to control unit; Control unit 70 judges whether output voltage is normal; If normal, then controlled processing unit 50 carries out power supply output; If undesired, then control switch unit 10 power off signal input stops power supply output.
Fig. 3 is the circuit diagram of first kind of execution mode of power-switching circuit of the present invention.This execution mode comprises switch element 10, sampling unit 20, and driver element 30, processing unit 50, feedback unit 40 and control unit 70, control unit 70 comprises control chip U2.
Complementary amplifying circuit comprises triode Q2, triode Q3 and resistance R 5; The collector electrode of triode Q2 and triode Q3 all is connected to processing unit; The base stage of triode Q2 and triode Q3 all is connected to processing unit through resistance R 4, and resistance R 5 is series between the emitter of emitter and triode Q3 of triode Q2.
A plurality of driving tubes comprise driving tube Q4 and driving tube Q5, and its grid all is connected between the emitter of resistance R 5 and triode Q3, and source electrode all is connected in processing unit 50, and drain electrode all is connected in sampling unit 20.
This execution mode can also comprise control unit 70, is connected in switch element 10 and processing unit 50, receives user interface perhaps from circuit control information, and according to the signal output of control information control to switch element 10 and processing unit 50.This control unit 70 comprises control chip U2, switch Q1, electric capacity R3 and resistance R 3; Control chip U2 is connected in the grid of switch element 10 and switch Q1; The source electrode of switch Q1 is connected in feedback unit 40; The drain electrode of switch Q1 is connected in processing unit, and electric capacity R3 and resistance R 3 are series between the source electrode and drain electrode of switch Q1.
Can also comprise AD sampling unit 60 in this execution mode; Be connected between said power output end and the control chip U2; Be used for monitoring in real time the output voltage of said power output end; And feed back said output voltage information to control chip U2, by the operating state of control chip U2 control switch unit 10 with processing unit 50.AD sampling unit 60 is a kind of AD sampling A, is another additional supply monitoring protection measure.
Fig. 4 is the circuit diagram of second kind of execution mode of power-switching circuit of the present invention.This execution mode is with the difference of first kind of execution mode shown in Figure 3; Switch element 10 has adopted switching tube Q6 to replace relay K 1; Switch element 10 comprises switching tube Q6 and capacitor C 1, and the grid of switching tube Q6 is connected in said control chip U2, and drain electrode is connected in power input Vin; Source electrode is connected in sampling unit 20, and capacitor C 1 is connected between power input Vin and the ground.
Power-switching circuit provided by the present invention and device; The present invention adopts 40 pairs of power output ends of feedback unit to detect in real time; And in time feed back to processing unit 50, and control by 50 pairs of driver elements 30 of processing unit, improved the reliability and the fail safe of subsequent conditioning circuit application of power; Solved in the prior art shown in Figure 5 and to occur causing source voltage directly to output to output unusually, jeopardized patient's problem; Adopt complementary power amplification circuit at driver element 30, improved the driving force and the reliability of driver element 30, solved in the prior art shown in Figure 5, driving force is limited, and electric voltage dropping is serious, can not satisfy the problem of power reguirements; In driver element 30, adopt a plurality of driving tube heat radiations, improved the radiating effect of driver element 30, the reliability that has solved device in the prior art shown in Figure 5 is all unfavorable with heat radiation, and high heat influences the problem of the accuracy of built-in sensor.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (10)
1. a power conversion method is realized the power source conversion from the power input to the power output end, it is characterized in that, comprising:
Switch element is from said power input input power supply signal;
Sampling unit is controlled the size of current of said power output end;
Processing unit starts driver element;
Said driver element carries out exporting changing voltage after the voltage transitions to the power supply signal of input;
Feedback unit is with feedback information to the said processing unit of said changing voltage;
Said processing unit judges according to the information of said changing voltage whether changing voltage is normal;
If normal, then carry out power supply output;
If unusual, then stop power supply output.
2. power conversion method according to claim 1 is characterized in that, the output changing voltage also comprised after driver element carried out voltage transitions to said power supply signal:
Said power supply signal inputs to complementary power amplification circuit;
Said complementary power amplification circuit amplifies voltage, and the output changing voltage;
Driving tube Q4 and driving tube Q5 import said changing voltage simultaneously, and the said changing voltage of back output dispels the heat.
3. power conversion method according to claim 2 is characterized in that, if normal, then carry out power supply output and also comprises:
Said processing unit is according to the said driver element of the signal enabling of said feedback unit;
Said driver element is accomplished voltage transitions and is carried out power supply output.
4. power conversion method according to claim 1 is characterized in that, also comprises:
The output voltage of AD sampling unit monitoring power output end;
Said AD sampling unit feeds back said output voltage to control unit;
Said control unit judges whether said output voltage is normal;
If normal, then control said processing unit and carry out power supply output;
If undesired, then control said switch element power off signal input, stop power supply output.
5. a power-switching circuit is realized the power source conversion from the power input to the power output end, it is characterized in that, comprising:
Switch element is connected in power input, the input and the disconnection of control power supply signal;
Sampling unit is connected in said switch element, the size of current of control power output end;
Driver element is connected in said sampling unit, and said power supply signal is carried out exporting changing voltage after the voltage transitions;
Processing unit is connected between said sampling unit and the said driver element, is used to control enabling of said driver element;
Feedback unit is connected in said driver element and said processing unit, exports feedback information to the said processing unit of said changing voltage.
6. power-switching circuit according to claim 5; It is characterized in that: said driver element adopts complementary amplifying circuit to carry out voltage transitions; Said complementary amplifying circuit comprises triode Q2, triode Q3 and resistance R 5; The collector electrode of triode Q2 and triode Q3 all is connected to said processing unit, and the base stage of triode Q2 and triode Q3 all is connected to said processing unit through resistance R 4, and resistance R 5 is series between the emitter of emitter and said triode Q3 of said triode Q2.
7. power-switching circuit according to claim 6 is characterized in that: said driver element adopts a plurality of driving tubes to dispel the heat, the quantity of driving tube >=2.
8. power-switching circuit according to claim 7; It is characterized in that: said driver element comprises driving tube Q4 and driving tube Q5; Its grid all is connected between the emitter of said resistance R 5 and said triode Q3; Source electrode all is connected in said processing unit, and drain electrode all is connected in said sampling unit.
9. power-switching circuit according to claim 5; It is characterized in that: also comprise control unit; Be connected in said switch element and processing unit, according to the operating state of user interface or said switch element of circuit control information Control and said processing unit.
10. want 9 described power-switching circuits according to right; It is characterized in that: also comprise the AD sampling unit; Be connected between said power output end and the control unit, be used for monitoring in real time the output voltage of said power output end, and feedback control information to said control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101299084A CN101789695B (en) | 2010-03-19 | 2010-03-19 | Power supply changeover method and circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101299084A CN101789695B (en) | 2010-03-19 | 2010-03-19 | Power supply changeover method and circuit thereof |
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| CN101789695A CN101789695A (en) | 2010-07-28 |
| CN101789695B true CN101789695B (en) | 2012-05-30 |
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| CN104835218A (en) * | 2015-05-11 | 2015-08-12 | 上海航盛实业有限公司 | Rotational speed signal acquisition system of driving recorder |
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| JP2005168106A (en) * | 2003-11-28 | 2005-06-23 | Toshiba Corp | Power supply unit |
| JP2007300746A (en) * | 2006-05-01 | 2007-11-15 | Sony Corp | Power supply unit |
| JP5174390B2 (en) * | 2007-08-06 | 2013-04-03 | ローム株式会社 | Power supply device and electronic apparatus equipped with the same |
| JP2010015735A (en) * | 2008-07-02 | 2010-01-21 | Harison Toshiba Lighting Corp | Lighting device for discharge lamp |
| CN201656774U (en) * | 2010-03-19 | 2010-11-24 | 深圳市普博科技有限公司 | Power supply conversion circuit and device |
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Denomination of invention: Power supply changeover method and circuit thereof Effective date of registration: 20191212 Granted publication date: 20120530 Pledgee: Agricultural Bank of China Limited Qianhai branch Pledgor: Shenzhen Poople Science and Technology Co., Ltd. Registration number: Y2019440020035 |
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Address after: 518000 Area A, 9th floor, 6th floor, Building C, 71-3 Xintian Avenue, Fuyong Street, Baoan District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. Address before: Shenzhen City, Nanshan District 518000, Guangdong Province along the road No. 37 Building No. 3 2A/2B jinlimei Patentee before: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. |
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Date of cancellation: 20210107 Granted publication date: 20120530 Pledgee: Agricultural Bank of China Limited Qianhai branch Pledgor: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. Registration number: Y2019440020035 |
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Address after: 518000 area a, 6th floor, 9th floor, building C, 71-3 Xintian Avenue, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Pubo Medical Technology Co.,Ltd. Address before: 518000 area a, 6th floor, 9th floor, building C, 71-3 Xintian Avenue, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. |
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