CN102290994A - Isolating transmission method of switch power supply and circuit thereof - Google Patents
Isolating transmission method of switch power supply and circuit thereof Download PDFInfo
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- CN102290994A CN102290994A CN2011102301508A CN201110230150A CN102290994A CN 102290994 A CN102290994 A CN 102290994A CN 2011102301508 A CN2011102301508 A CN 2011102301508A CN 201110230150 A CN201110230150 A CN 201110230150A CN 102290994 A CN102290994 A CN 102290994A
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Abstract
The invention discloses an isolating transmission method of a switch power supply and a circuit thereof. An error signal sampled by a sampling circuit sequentially passes through an isolating circuit and a rectifying and filtering circuit and then is outputted; the isolating circuit consists of an isolating transformer, a driving triode and a pulse signal source; the pulse signal source outputs a pulse signal with fixed frequency and fixed pulse width; the pulse signal mixes with the error signal outputted by the sampling circuit at a primary winding of the isolating transformer via the driving triode and; the mixed signal is outputted to the rectifying and filtering circuit from a secondary winding of the isolating transformer; and a direct current level signal, the amplitude value of which is controlled by the error signal, is outputted after the rectifying and filtering circuit rectifies and filters the mixed signal. The isolating transmission method and the circuit thereof disclosed by the invention have the characteristics of high transmission ratio in small signal transmitting, little influence from temperature change and strong radioresistance and have good stability and high use derating and are suitable for fields with adverse environments, such as aerospace, war industry, communications and the like.
Description
Technical field
The present invention relates to a kind of isolation transmission method and circuit thereof, particularly a kind of Switching Power Supply isolation transmission method and circuit thereof that is fit to be applied under space flight, military project, the contour adverse circumstances of communication.
Background technology
In the prior art, in order to reach the purpose of Switching Power Supply regulated output voltage, secondary sampling error signal in Switching Power Supply, after this signal amplifies through error amplifier, convert current signal to and output to the control chip on the former limit of Switching Power Supply, to realize that the drive signal of switching tube is carried out FEEDBACK CONTROL by light-coupled isolation.
Fig. 1 shows a kind of concrete isolation and transmission circuit of this feedback, the first divider resistance R456 wherein, the second divider resistance R457 and error amplifier IC450 form sample circuit, the first divider resistance R456 and the second divider resistance R457 are in series, one end of this series arm is the Input voltage terminal Vin+ of this isolation and transmission circuit, be connected to the output voltage terminal of Switching Power Supply, the other end is the input voltage reference edge Vin-of this isolation and transmission circuit, be connected to the output voltage reference edge of Switching Power Supply, the serial connection point of this series arm is connected to the control end of error amplifier IC450, the anode of error amplifier IC450 is connected to the other end of described series arm, a road of error amplifier IC450 negative electrode is connected to an end of described series arm successively by resistance R 461 and resistance R 460, resistance R 461 and resistance R 460 are used for the electric current that control flows is crossed the optocoupler diode; Another road is connected to its control end by resistance R 455 and capacitor C 456 successively, constitutes the negative feedback branch road of error amplifier IC450; The first divider resistance R456 and the second divider resistance R457 export at its negative electrode after error amplifier IC450 amplifies from the output sampling error signal of Switching Power Supply; Isolate the anode pin 1 of optocoupler OC1 and the two ends that negative electrode pin 2 is connected in parallel on resistance R 460, emitter pin 3 ground connection of isolating optocoupler OC1, its collector electrode pin 4 is the output voltage terminal Vout of isolation and transmission circuit, be connected to the control end COM of the pwm chip in the Switching Power Supply, error signal through amplifying is by isolating the control end COM that optocoupler OC1 outputs to the pwm chip in the Switching Power Supply, to realize the control to PWM.
But there is following shortcoming in the mode that small-signal is transmitted in this traditional use light-coupled isolation: 1. after the variation of ambient temperature, transfer ratio is had a strong impact on, and makes the control loop of power supply out of control; 2. transfer ratio is little, is unfavorable for loop stability; 3. capability of resistance to radiation is poor, and related data shows that the radiation-resistant accumulated dose of optocoupler is no more than 3*10
4Rad (si).
And in fields such as space flight, military project, communications, Switching Power Supply generally all can be worked in the environment of airtight, high temperature, so, the stability of power supply product, power deratng etc. all there are higher requirement, just inapplicable with the method for light-coupled isolation transmission error signal.
Summary of the invention
The isolation transmission method that the purpose of this invention is to provide a kind of Switching Power Supply, this isolation transmission method can overcome above-mentioned shortcoming, the transfer ratio height of transmission small-signal, be subjected to influence of temperature change little and capability of resistance to radiation is strong, Switching Power Supply can be operated in the environment of airtight, high temperature, and have good stability, the high characteristics of use derate, be fit to be applied in the field of space flight, military project, the contour adverse circumstances of communication.
Another object of the present invention provides the isolation and transmission circuit of the Switching Power Supply that realizes said method.
First purpose of the present invention realizes by following technical measures:
A kind of isolation transmission method of Switching Power Supply is exported by buffer circuit and current rectifying and wave filtering circuit successively through the error signal of sample circuit sampling; Described buffer circuit adopts isolating transformer, drives triode and pulse signal source composition, the pulse signal of pulse signal source output fixed frequency and pulsewidth, described pulse signal mixes at the elementary winding (Np) of isolating transformer with the error signal of sample circuit output mutually by driving triode, this mixed signal outputs to current rectifying and wave filtering circuit from isolating transformer secondary winding (Ns), and amplitude of output is subjected to the dc level signal of error signal control after current rectifying and wave filtering circuit carries out rectification, filtering to it.
Second purpose of the present invention realizes by following technical measures:
A kind of isolation and transmission circuit of Switching Power Supply, comprise sample circuit and buffer circuit, the Input voltage terminal of described sample circuit and input voltage reference edge are the Input voltage terminal and the input voltage reference edge of isolation and transmission circuit, also comprise current rectifying and wave filtering circuit, described buffer circuit comprises isolating transformer, drive triode and pulse signal source, pulse signal source is connected to the base stage that drives triode, the emitter that drives triode is connected to the input voltage reference edge of described sample circuit, its collector electrode is connected to an end of the elementary winding of isolating transformer (Np), the other end of the elementary winding of isolating transformer (Np) is connected to the output of described sample circuit, one end ground connection of isolating transformer secondary winding (Ns), the other end is connected to the input of described current rectifying and wave filtering circuit, and the output of described current rectifying and wave filtering circuit is the output voltage terminal of isolation and transmission circuit; The pulse signal of pulse signal source output fixed frequency and pulsewidth, described pulse signal is by driving triode and mixing mutually at the elementary winding (Np) of isolating transformer through the error signal of sample circuit sampling, this mixed signal outputs to current rectifying and wave filtering circuit from isolating transformer secondary winding (Ns), and amplitude of output is subjected to the dc level signal of error signal control after current rectifying and wave filtering circuit carries out rectification, filtering to it.
In order to guarantee that driving triode Q1 is not burnt out by overcurrent, described pulse signal source is connected to the base stage of described driving triode by current-limiting resistance.
As one embodiment of the present invention, described isolation and transmission circuit is applied on the feedback branch of Switching Power Supply, the input signal of the Input voltage terminal of isolation and transmission circuit is from the output voltage terminal of Switching Power Supply, the input signal of the input voltage reference edge of described isolation and transmission circuit is from the output voltage reference edge of Switching Power Supply, the dc level signal of the output voltage terminal output of described isolation and transmission circuit is transferred to the control end of control chip in the Switching Power Supply, be used to control the output of described control chip, the by-pass cock electric power output voltage.
As one embodiment of the present invention, described current rectifying and wave filtering circuit comprises rectifier diode, isolating diode, first filter capacitor and load resistance, filter capacitor and load resistance are in parallel, one end ground connection of this parallel branch, the other end is connected to the negative electrode of rectifier diode, the negative electrode of isolating diode is connected with the negative electrode of rectifier diode, and the anode of rectifier diode is the input of described current rectifying and wave filtering circuit, and the anode of isolating diode is the output of described current rectifying and wave filtering circuit.
As one embodiment of the present invention, described sample circuit comprises error amplifier, biasing resistor, second filter capacitor, feedback capacity, first divider resistance and second divider resistance; First divider resistance and second divider resistance are in series, the tie point of this series arm is connected to the control end of error amplifier, the negative electrode of error amplifier is connected to an end of described series arm by biasing resistor, this end is the Input voltage terminal of sample circuit, the anode of error amplifier is connected to the other end of described series arm, this end is the input voltage reference edge of sample circuit, the negative electrode of error amplifier is leaded up to feedback capacity, be connected to its control end, another road is connected to its anode by second filter capacitor, and the negative electrode of error amplifier is the output of described sample circuit.
Compared with prior art, the present invention has following outstanding advantage:
1, owing to use isolating transformer to replace optocoupler, under high mal-condition, isolation and transmission circuit reliability of the present invention is than the height of optocoupler transmission circuit, and capability of resistance to radiation is stronger than optocoupler transmission circuit, and product is applicable to military project, space industry.
2, under high mal-condition, the use derate of isolation and transmission circuit of the present invention is than the height of optocoupler transmission circuit.
3, adopt the Switching Power Supply of isolation and transmission circuit of the present invention, under three temperature (low temperature, normal temperature, the high temperature) environment of development, loop is debugged easily.
Description of drawings
Fig. 1 is the circuit theory diagrams of prior art;
Fig. 2 is the circuit theory diagrams of the embodiment of the invention one;
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 2 shows the isolation and transmission circuit of the embodiment of the invention one, comprises sample circuit, buffer circuit and current rectifying and wave filtering circuit.
Buffer circuit comprises isolating transformer T1, drives triode Q1, current-limiting resistance R5 and pulse signal source VS; Pulse signal source VS is connected to the base stage 1 that drives triode Q1 by current-limiting resistance R5, the emitter 3 that drives triode Q1 is connected to the input voltage reference edge Vin-of isolation and transmission circuit, and the collector electrode 2 that drives triode Q1 is connected to the different name end of the elementary winding Np of isolating transformer T1; The pulse signal of pulse signal source VS output fixed frequency and fixed pulse width, driving triode Q1 afterpulsing signal is operated in and opens and end the state that replaces, to the elementary winding Np input fixed frequency of isolating transformer T1 and the signal of fixed pulse width, after isolating transformer T1 magnetic coupling, the secondary winding Ns of isolating transformer T1 exports the signal of corresponding fixed frequency and fixed pulse width.
Sample circuit comprises error amplifier U1, the first divider resistance R3, the second divider resistance R4, biasing resistor R2, the second filter capacitor C2 and feedback capacity C3; The first divider resistance R3 and the second divider resistance R4 are in series, the tie point of this series arm is connected to the control end 1 of error amplifier U1, the negative electrode 3 of error amplifier U1 is connected to an end of described series arm by biasing resistor R2, this end is the Input voltage terminal Vin+ of isolation and transmission circuit, its input signal is from the output voltage terminal of Switching Power Supply, the anode 2 of error amplifier U1 is connected to the other end of described series arm, this end is the input voltage reference edge Vin-of isolation and transmission circuit, its input signal is from the output voltage reference edge of Switching Power Supply, the negative electrode 3 of error amplifier U1 is leaded up to feedback capacity C3 and is connected to its control end 1, another road is connected to its anode 2 by the second filter capacitor C2, the negative electrode 3 of error amplifier is the output of sample circuit, be connected to the end of the same name of the elementary winding Np of isolating transformer T1, the error signal of the first divider resistance R3 and the output of the second divider resistance R4 sampling switch power supply is input to the control end 1 of error amplifier U1, the elementary winding Np of this signal input isolating transformer T1 after error amplifier U1 amplifies, and mix mutually with the fixed frequency of described driving triode Q1 input and the signal of fixed pulse width, formation fixed frequency and pulsewidth, the pulse signal of amplitude tracking error amplifier output voltage, this pulse signal to its secondary winding Ns, finally makes the pulsewidth amplitude of isolating transformer T1 secondary winding Ns output pulse signal produce corresponding the variation in response to the variable signal of switch power source output voltage by isolating transformer T1 magnetic coupling.
Wherein, can to adopt model be the error amplifier of TL431 or the model of other similar functions to above-mentioned error amplifier U1.
Current rectifying and wave filtering circuit comprises rectifier diode D2, load resistance R1, the first filter capacitor C1 and isolating diode D1; The end of the same name of described isolating transformer T1 secondary winding Ns is connected to the anode of rectification diode D2, its different name end ground connection, the negative electrode of rectifier diode D2 is leaded up to load resistance R1 and is connected to the different name end of isolating transformer T1, another road is connected to the negative electrode of isolating diode D1, the first filter capacitor C1 and load resistance R1 are in parallel, the anode of isolating diode D1 is the output voltage terminal Vout of isolation and transmission circuit, the pulse signal of described isolating transformer T1 secondary winding Ns output is behind over commutation diode D2 and filter capacitor C1 rectifying and wave-filtering, be subjected to the dc level signal of error signal control in amplitude of the output voltage terminal Vout of described isolation and transmission circuit output by isolating diode D1, the output signal of this isolation and transmission circuit is input to the control end COM of the control chip in the Switching Power Supply, in order to the COM pin level of control control chip.
Wherein, control chip in the above-mentioned Switching Power Supply can be the PWM chip, by isolation and transmission circuit as feedback branch, the COM pin level of the dc level signal control PWM chip of its output, with the pulsewidth of control output mos pipe drive signal, finally reach the purpose of control switching output voltage.
Embodiments of the present invention are not limited thereto, and as the different needs according to the control chip in the Switching Power Supply, the negative electrode 1 of error amplifier U1 and the connected mode of driving triode Q1 and the elementary winding Np of isolating transformer T1 can be exchanged; Drive triode Q1 and can adopt NPN type triode or positive-negative-positive triode; Current rectifying and wave filtering circuit can adopt that all can carry out the functional circuit of rectification and filtering to input signal in the prior art; Sample circuit also can have different implementations; So; according to foregoing of the present invention; utilize the ordinary skill knowledge and the customary means of this area; do not breaking away under the above-mentioned basic fundamental thought of the present invention prerequisite; concrete enforcement circuit can also be made modification, replacement or the change of other various ways among the present invention, all drops within the rights protection scope of the present invention.
Claims (6)
1. the isolation transmission method of a Switching Power Supply is characterized in that: export by buffer circuit and current rectifying and wave filtering circuit successively through the error signal that sample circuit is sampled; Described buffer circuit adopts isolating transformer, drives triode and pulse signal source composition, the pulse signal of pulse signal source output fixed frequency and pulsewidth, described pulse signal mixes at the elementary winding (Np) of isolating transformer with the error signal of sample circuit output mutually by driving triode, this mixed signal outputs to current rectifying and wave filtering circuit from isolating transformer secondary winding (Ns), and amplitude of output is subjected to the dc level signal of error signal control after current rectifying and wave filtering circuit carries out rectification, filtering to it.
2. isolation and transmission circuit that adopts the Switching Power Supply of the described method of claim 1, comprise sample circuit and buffer circuit, the Input voltage terminal of described sample circuit and input voltage reference edge are the Input voltage terminal and the input voltage reference edge of isolation and transmission circuit, it is characterized in that: also comprise current rectifying and wave filtering circuit, described buffer circuit comprises isolating transformer, drive triode and pulse signal source, pulse signal source is connected to the base stage that drives triode, the emitter that drives triode is connected to the input voltage reference edge of described sample circuit, its collector electrode is connected to an end of the elementary winding of isolating transformer (Np), the other end of the elementary winding of isolating transformer (Np) is connected to the output of described sample circuit, one end ground connection of isolating transformer secondary winding (Ns), the other end is connected to the input of described current rectifying and wave filtering circuit, and the output of described current rectifying and wave filtering circuit is the output voltage terminal of isolation and transmission circuit; The pulse signal of pulse signal source output fixed frequency and pulsewidth, described pulse signal is by driving triode and mixing mutually at the elementary winding (Np) of isolating transformer through the error signal of sample circuit sampling, this mixed signal outputs to current rectifying and wave filtering circuit from isolating transformer secondary winding (Ns), and amplitude of output is subjected to the dc level signal of error signal control after current rectifying and wave filtering circuit carries out rectification, filtering to it.
3. according to the isolation and transmission circuit of the described Switching Power Supply of claim 2, it is characterized in that: described pulse signal source is connected to the base stage of described driving triode by current-limiting resistance.
4. according to the isolation and transmission circuit of the described Switching Power Supply of claim 3, it is characterized in that: the input signal of the Input voltage terminal of described isolation and transmission circuit is from the output voltage terminal of Switching Power Supply, the input signal of the input voltage reference edge of described isolation and transmission circuit is from the output voltage reference edge of Switching Power Supply, and the dc level signal of the output voltage terminal of described isolation and transmission circuit output is transferred to the control end of control chip in the Switching Power Supply.
5. according to the isolation and transmission circuit of the described Switching Power Supply of claim 4, it is characterized in that: described current rectifying and wave filtering circuit comprises rectifier diode, isolating diode, first filter capacitor and load resistance, first filter capacitor and load resistance are in parallel, one end ground connection of this parallel branch, the other end is connected to the negative electrode of rectifier diode, the negative electrode of isolating diode is connected with the negative electrode of rectifier diode, the anode of rectifier diode is the input of described current rectifying and wave filtering circuit, and the anode of isolating diode is the output of described current rectifying and wave filtering circuit.
6. according to the isolation and transmission circuit of the described Switching Power Supply of claim 4, it is characterized in that: described sample circuit comprises error amplifier, biasing resistor, second filter capacitor, feedback capacity, first divider resistance and second divider resistance; First divider resistance and second divider resistance are in series, the tie point of this series arm is connected to the control end of error amplifier, the negative electrode of error amplifier is connected to an end of described series arm by biasing resistor, this end is the Input voltage terminal of sample circuit, the anode of error amplifier is connected to the other end of described series arm, this end is the input voltage reference edge of sample circuit, the negative electrode of error amplifier is leaded up to feedback capacity, be connected to its control end, another road is connected to its anode by second filter capacitor, and the negative electrode of error amplifier is the output of described sample circuit.
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| CN2011102301508A CN102290994A (en) | 2011-08-11 | 2011-08-11 | Isolating transmission method of switch power supply and circuit thereof |
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| CN2011102301508A CN102290994A (en) | 2011-08-11 | 2011-08-11 | Isolating transmission method of switch power supply and circuit thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968895A (en) * | 2012-11-22 | 2013-03-13 | 昆山北极光电子科技有限公司 | Remote distance transmission method of generator speed |
| CN103560778A (en) * | 2013-10-16 | 2014-02-05 | 广州金升阳科技有限公司 | Two-wire system signal isolation transmission circuit |
| CN107370483A (en) * | 2017-08-04 | 2017-11-21 | 深圳市嘉昱机电有限公司 | Pulse receiving circuit |
| CN108134600A (en) * | 2018-02-12 | 2018-06-08 | 中山市嘉科电子有限公司 | A kind of switching signal isolation circuit |
| CN108716319A (en) * | 2018-08-01 | 2018-10-30 | 珠海格力电器股份有限公司 | Intelligent door lock, intelligent door lock method of supplying power to and device |
| CN109001526A (en) * | 2018-09-18 | 2018-12-14 | 郭丰齐 | Isolated voltage collection circuit |
| CN110336580A (en) * | 2019-07-23 | 2019-10-15 | 苏州诺思医疗技术有限公司 | Handle answering machine, communication system and the mixed signal analytic method of mixed signal |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
| CN111987912A (en) * | 2020-06-22 | 2020-11-24 | 合肥海尔智能电子有限公司 | Power supply circuit for switching output positive and negative voltages |
| CN112532197A (en) * | 2020-11-17 | 2021-03-19 | 北京中电华大电子设计有限责任公司 | Envelope restoration circuit |
| CN112769337A (en) * | 2020-12-31 | 2021-05-07 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Modulation type transformer isolation driving circuit independent of switching frequency |
| CN113552474A (en) * | 2021-07-29 | 2021-10-26 | 上海壁仞智能科技有限公司 | Compatible power interface detection circuit and electronic equipment |
| CN114062758A (en) * | 2021-10-23 | 2022-02-18 | 广州金升阳科技有限公司 | Electric signal detection method, circuit and switching power supply |
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| JP2010259257A (en) * | 2009-04-27 | 2010-11-11 | Ricoh Co Ltd | Switching regulator and operation control method thereof |
| CN101997422A (en) * | 2010-09-29 | 2011-03-30 | 北京控制工程研究所 | Forward converter voltage error feedback magnetic isolation method and magnetic isolation circuit |
| CN201887664U (en) * | 2010-12-15 | 2011-06-29 | 北京新雷能科技股份有限公司 | Magnetic isolation feedback circuit of switch power supply |
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| JP2010259257A (en) * | 2009-04-27 | 2010-11-11 | Ricoh Co Ltd | Switching regulator and operation control method thereof |
| CN101997422A (en) * | 2010-09-29 | 2011-03-30 | 北京控制工程研究所 | Forward converter voltage error feedback magnetic isolation method and magnetic isolation circuit |
| CN201887664U (en) * | 2010-12-15 | 2011-06-29 | 北京新雷能科技股份有限公司 | Magnetic isolation feedback circuit of switch power supply |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102968895A (en) * | 2012-11-22 | 2013-03-13 | 昆山北极光电子科技有限公司 | Remote distance transmission method of generator speed |
| CN103560778A (en) * | 2013-10-16 | 2014-02-05 | 广州金升阳科技有限公司 | Two-wire system signal isolation transmission circuit |
| CN103560778B (en) * | 2013-10-16 | 2016-04-20 | 广州金升阳科技有限公司 | A kind of two-wire system signal-isolated transmission circuit |
| CN107370483A (en) * | 2017-08-04 | 2017-11-21 | 深圳市嘉昱机电有限公司 | Pulse receiving circuit |
| CN108134600A (en) * | 2018-02-12 | 2018-06-08 | 中山市嘉科电子有限公司 | A kind of switching signal isolation circuit |
| CN108716319A (en) * | 2018-08-01 | 2018-10-30 | 珠海格力电器股份有限公司 | Intelligent door lock, intelligent door lock method of supplying power to and device |
| CN109001526A (en) * | 2018-09-18 | 2018-12-14 | 郭丰齐 | Isolated voltage collection circuit |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
| CN110336580A (en) * | 2019-07-23 | 2019-10-15 | 苏州诺思医疗技术有限公司 | Handle answering machine, communication system and the mixed signal analytic method of mixed signal |
| CN111987912A (en) * | 2020-06-22 | 2020-11-24 | 合肥海尔智能电子有限公司 | Power supply circuit for switching output positive and negative voltages |
| CN111987912B (en) * | 2020-06-22 | 2022-03-15 | 合肥海尔智能电子有限公司 | Power supply circuit for switching output positive and negative voltages |
| CN112532197A (en) * | 2020-11-17 | 2021-03-19 | 北京中电华大电子设计有限责任公司 | Envelope restoration circuit |
| CN112769337A (en) * | 2020-12-31 | 2021-05-07 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Modulation type transformer isolation driving circuit independent of switching frequency |
| CN112769337B (en) * | 2020-12-31 | 2022-03-08 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Modulation type transformer isolation driving circuit independent of switching frequency |
| CN113552474A (en) * | 2021-07-29 | 2021-10-26 | 上海壁仞智能科技有限公司 | Compatible power interface detection circuit and electronic equipment |
| CN113552474B (en) * | 2021-07-29 | 2023-04-07 | 上海壁仞智能科技有限公司 | Compatible power interface detection circuit and electronic equipment |
| CN114062758A (en) * | 2021-10-23 | 2022-02-18 | 广州金升阳科技有限公司 | Electric signal detection method, circuit and switching power supply |
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