CN105305851A - Voltage reduction control method of switching power supply - Google Patents

Voltage reduction control method of switching power supply Download PDF

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Publication number
CN105305851A
CN105305851A CN201510773062.0A CN201510773062A CN105305851A CN 105305851 A CN105305851 A CN 105305851A CN 201510773062 A CN201510773062 A CN 201510773062A CN 105305851 A CN105305851 A CN 105305851A
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China
Prior art keywords
control
output
module
voltage
switching tube
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Pending
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CN201510773062.0A
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Chinese (zh)
Inventor
孙向琳
刘厚成
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Suzhou Yangfu Automation Equipment Co Ltd
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Suzhou Yangfu Automation Equipment Co Ltd
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Priority to CN201510773062.0A priority Critical patent/CN105305851A/en
Publication of CN105305851A publication Critical patent/CN105305851A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a voltage reduction control method of a switching power supply. The switching power supply comprises an alternating current filtering module, a rectification module, a DC/DC (Direct Current/Direct Current) module, a control module, an output filtering voltage-stabilizing module, an output detection circuit and a relay, wherein the control module comprises a control chip, a switching tube and a diode; an input end of the switching tube is connected with an output end of the DC/DC module; an output end of the switching tube is connected with an input end of the control chip and an earthing end respectively; a control end of the switching tube is connected with a signal output end of the control chip; a positive pole of the diode is connected with the input end of the switching tube; a negative pole of the diode is connected with an input end of the output filtering voltage-stabilizing module; and a duty ratio of conduction of the switching tube is controlled to be 1/2-2/3 within a cycle. Output voltage is controlled by controlling the duty ratio of the conduction of the switching tube and can be flexibly regulated according to different demands, so that the control efficiency is effectively improved.

Description

A kind of step-down control method of Switching Power Supply
Technical field
The invention belongs to power circuit application, be specifically related to a kind of step-down control method of Switching Power Supply.
Background technology
Charge power supply chargingsupply is for the rectifying device of charge in batteries.Early stage employing alternating current motor-DC generation unit (also known as rotary unit) makes charge power supply, and after the sixties in 20th century, the charge power supply be made up of power electronic device replaces.Charge power supply often adopts single-phase (or three-phase) half-controlled rectifier circuit (to be mixed by thyristor and diode and form, load voltage can not oppositely) or the rectification circuit of uncontrollable rectifier circuit (forming by without the rectifier diode controlling kinetic energy) adjunction AC voltage regulator, in DC circuit, direct current need be suppressed to pulse with smoothing reactor, prevent discontinuous current.
Charge in batteries mode has usually: 1. constant voltage charging.Charging voltage is constant, and charging current rises with battery tension and reduces, until be zero.2. constant current charge.For preventing bubble and acid mist, the constant current charge method of the conventional electric current that falls progressively stage by stage.3. constant voltage constant current charge.First constant current charge, when voltage reach produce bubble time constant voltage charge again.4. gas efficiency charging is determined.First use large current charge, when storage battery gas efficiency is to certain steady state value, reduce charging current, make gas efficiency be stabilized in lower numerical value.5. constant temperature mise-a-la-masse method.After battery temp is raised to certain definite value, reduces charging current, make battery temp remain on setting.In addition, there is pulse current charge, electric discharge and rapid nitriding after the fifties.Its charging interval only needs several tens minutes (normal charge needs tens of hours).RAPID CHARGING POWER SUPPLY, apart from charging circuit, also has discharge circuit.All kinds of charge power supply, except main circuit, has all needed corresponding detection and control circuit.
Charger for mobile phone roughly can be divided into traveling charger, base charger, USB charger and maintenance type charger, mainly above two kinds of general user's contact.And market to be sold at most be traveling charger, the form of traveling charger also has varied, and the miniature trip that common are low-cost duck's egg type fills, common desktop strap clamp type charger, the high-grade desk type charger of band liquid crystal display.In view of cellphone subscriber's overwhelming majority Dou Shi unprofessional user, so charger substantially all has the function being full of automatic stop, and major part all belongs to quick charger, and the charging interval is at 1-3 hours.On market, oneself employing microcomputerized control all bragged about by a lot of charger, comprise the miniature trip of some prices dog-cheap duck's egg type to fill, in fact strictly analyze from charging circuit, very fraction charger could be truly known as microcomputerized control (Single-chip Controlling).
In use we also can check the performance of charger.Temperature rise is slightly had to be normal phenomenon at the later stage battery of charging, if but battery is obviously hot, then and illustrate that charger fails to detect that battery charging is saturated in time, cause and overcharge, this is unfavorable to the life-span of battery.
Although a lot of charger does not overcharge phenomenon, there is the problem of undercharge, directly translate into battery discharge time short, namely the cell phone standby air time is short.Using the user of original-pack random new battery, the roughly reference time that can comparative descriptions book provide, is contrasted, if referential data obviously exists gap with actual use, then have reason to suspect the problem of charger, certainly also do not get rid of other factors such as battery quality, mobile phone environment for use.
In the process of charging, if do not pull out power supply, just have the phenomenon of ceaselessly charging, can cause the lifetime of battery like this, impact uses.
Summary of the invention
Technical problem to be solved by this invention is: the step-down control method providing a kind of Switching Power Supply, solves Switching Power Supply and exports uncontrollable problem.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of step-down control method of Switching Power Supply, comprise ac filter module, rectification module, DC/DC module, control module, output filtering Voltage stabilizing module, output detection circuit, relay, described ac filter module is used for carrying out filtering to civil power, it is direct current that rectification module is used for convert alternating current, DC/DC module is used for direct current to carry out voltage transformation, control module is used for the electric current to charging, voltage controls, the voltage that output filtering Voltage stabilizing module is used for exporting carries out filtering voltage regulation, described output detection circuit is for detecting output current, relay is used for the break-make of control input end alternating current, described control module comprises control chip, switching tube, diode, the input of described switching tube is connected with the output of DC/DC module, the output of described switching tube respectively with an input of control chip, earth terminal connects, the control end of described switching tube is connected with control chip signal output part, the anode of described diode is connected with the input of switching tube, the negative electrode of diode is connected with the input of output filtering Voltage stabilizing module, in one-period, the duty ratio of control switch pipe conducting is 1/2 ~ 2/3.
Described output detection circuit comprises comparator, first to fourth resistance, first to the 3rd electric capacity, the electrode input end of described comparator connects reference voltage, the negative pole of comparator respectively with first to fourth resistance, one end of second electric capacity connects, the other end of the second resistance is connected with one end of the first electric capacity, the other end of the 3rd resistance is connected with one end of the 3rd electric capacity, the other end of the first resistance, the other end of the 3rd electric capacity is all connected with the output of charger control circuit, the output of comparator respectively with the other end of the first electric capacity, the other end of the second electric capacity, the control end of relay connects, the other end ground connection of the 4th resistance.
Described reference voltage level is 1/2nd of charger control circuit output voltage.
The duty ratio of described switching tube conducting is 1/2.
Described output filtering Voltage stabilizing module comprises resistance, filter capacitor, after described resistance and filter capacitor are connected, then is parallel to output.
Described control module also comprises voltage control circuit, current control circuit, overheating protection circuit.
Compared with prior art, the present invention has following beneficial effect:
1, by the duty ratio of control switch pipe conducting, output voltage is controlled, according to different demands, can flexible output voltage, effectively improve control efficiency.
2, add output voltage detecting circuit, battery charge condition can be monitored at any time, after battery charging is saturated, automatically disconnects ac input end power supply, avoid repeatedly charging.
Accompanying drawing explanation
Fig. 1 is switching power source control circuit figure of the present invention.
Embodiment
Below structure of the present invention and the course of work are described further.
As shown in Figure 1, a kind of step-down control method of Switching Power Supply, comprise ac filter module, rectification module, DC/DC module, control module, output filtering Voltage stabilizing module, output detection circuit, relay, described ac filter module is used for carrying out filtering to civil power, it is direct current that rectification module is used for convert alternating current, DC/DC module is used for direct current to carry out voltage transformation, control module is used for the electric current to charging, voltage controls, the voltage that output filtering Voltage stabilizing module is used for exporting carries out filtering voltage regulation, described output detection circuit is for detecting output current, relay is used for the break-make of control input end alternating current, described control module comprises control chip, switching tube, diode, the input of described switching tube is connected with the output of DC/DC module, the output of described switching tube respectively with an input of control chip, earth terminal connects, the control end of described switching tube is connected with control chip signal output part, the anode of described diode is connected with the input of switching tube, the negative electrode of diode is connected with the input of output filtering Voltage stabilizing module, in one-period, the duty ratio of control switch pipe conducting is 1/2 ~ 2/3.
Described output detection circuit comprises comparator, first to fourth resistance, first to the 3rd electric capacity, the electrode input end of described comparator connects reference voltage, the negative pole of comparator respectively with first to fourth resistance, one end of second electric capacity connects, the other end of the second resistance is connected with one end of the first electric capacity, the other end of the 3rd resistance is connected with one end of the 3rd electric capacity, the other end of the first resistance, the other end of the 3rd electric capacity is all connected with the output of charger control circuit, the output of comparator respectively with the other end of the first electric capacity, the other end of the second electric capacity, the control end of relay connects, the other end ground connection of the 4th resistance.
Described reference voltage level is 1/2nd of charger control circuit output voltage.
The duty ratio of described switching tube conducting is 1/2.
Described output filtering Voltage stabilizing module comprises resistance, filter capacitor, after described resistance and filter capacitor are connected, then is parallel to output.
Described control module also comprises voltage control circuit, current control circuit, overheating protection circuit.
The control chip of described control module can adopt 51 series monolithics or more high-end control chip, can select different configurations according to concrete user demand.
The control chip of the present embodiment adopts the AT89S52 of 51 single-chip microcomputer series, and AT89S52 possesses following features:
AT89S52 is a kind of low-power consumption, high-performance CMOS 8 8-digit microcontroller, has 8K in-system programmable components flash storage.Use the manufacture of Atmel company high-density nonvolatile memory technology, with the instruction of industrial 80C51 product and pin completely compatible.On sheet, Flash allows program storage in-system programmable components, is also suitable for conventional programming device.On a single chip, have 8 dexterous bit CPUs and in-system programmable components Flash, height is flexible, the solution of super efficient for numerous embedded Control application system provides to make AT89S52.AT89S52 has following standard feature: 8k bytes Flash, 256 byte RAM, 32 I/O mouth lines, WatchDog Timer, 2 data pointers, three 16 bit timing device/counters, one 6 vector, 2 grades of interrupt structures, full duplex serial port, crystal oscillator and clock circuit in sheet.In addition, AT89S52 can be down to the operation of 0Hz static logic, supports that 2 kinds of software-selectable select energy-saving mode.Under idle pulley, CPU quits work, and permission RAM, timer/counter, serial ports, interruption work on.Under power down protection mode, RAM content is saved, and oscillator is frozen, and all work of single-chip microcomputer stop, and interrupt or hardware reset until next.
MCS-51 device has independent program storage and data storage.External program memory and data storage can 64K addressing.
The above is only some embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (6)

1. the step-down control method of a Switching Power Supply, comprise ac filter module, rectification module, DC/DC module, control module, output filtering Voltage stabilizing module, output detection circuit, relay, described ac filter module is used for carrying out filtering to civil power, it is direct current that rectification module is used for convert alternating current, DC/DC module is used for direct current to carry out voltage transformation, control module is used for the electric current to charging, voltage controls, the voltage that output filtering Voltage stabilizing module is used for exporting carries out filtering voltage regulation, described output detection circuit is for detecting output current, relay is used for the break-make of control input end alternating current, described control module comprises control chip, switching tube, diode, the input of described switching tube is connected with the output of DC/DC module, the output of described switching tube respectively with an input of control chip, earth terminal connects, the control end of described switching tube is connected with control chip signal output part, the anode of described diode is connected with the input of switching tube, the negative electrode of diode is connected with the input of output filtering Voltage stabilizing module, it is characterized in that: in one-period, the duty ratio of control switch pipe conducting is 1/2 ~ 2/3.
2. the step-down control method of Switching Power Supply according to claim 1, it is characterized in that: described output detection circuit comprises comparator, first to fourth resistance, first to the 3rd electric capacity, the electrode input end of described comparator connects reference voltage, the negative pole of comparator respectively with first to fourth resistance, one end of second electric capacity connects, the other end of the second resistance is connected with one end of the first electric capacity, the other end of the 3rd resistance is connected with one end of the 3rd electric capacity, the other end of the first resistance, the other end of the 3rd electric capacity is all connected with the output of charger control circuit, the output of comparator respectively with the other end of the first electric capacity, the other end of the second electric capacity, the control end of relay connects, the other end ground connection of the 4th resistance.
3. the step-down control method of Switching Power Supply according to claim 2, is characterized in that: described reference voltage level is 1/2nd of charger control circuit output voltage.
4. the step-down control method of Switching Power Supply according to claim 1, is characterized in that: the duty ratio of described switching tube conducting is 1/2.
5. the step-down control method of Switching Power Supply according to claim 1, is characterized in that: described output filtering Voltage stabilizing module comprises resistance, filter capacitor, after described resistance and filter capacitor are connected, then is parallel to output.
6. the step-down control method of Switching Power Supply according to claim 1, is characterized in that: described control module also comprises voltage control circuit, current control circuit, overheating protection circuit.
CN201510773062.0A 2015-11-13 2015-11-13 Voltage reduction control method of switching power supply Pending CN105305851A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2891442Y (en) * 2005-12-29 2007-04-18 比亚迪股份有限公司 Portable charger for electric automobile
CN102064591A (en) * 2010-11-12 2011-05-18 鸥瑞智诺能源科技(北京)有限公司 Braking energy recovery system with recovery charging current directly proportional to brake voltage variation
CN102570814A (en) * 2010-12-22 2012-07-11 中兴通讯股份有限公司 Switching power supply feedback compensation method and digital signal processing device
CN102999073A (en) * 2011-09-08 2013-03-27 洛阳嘉盛电源科技有限公司 Constant-voltage and constant-current control circuit applied to power supply technology
CN103023351A (en) * 2012-12-04 2013-04-03 上海交通大学 Electric automobile charging/discharging/storing integral station power flow three-level converter
US20130249469A1 (en) * 2012-03-21 2013-09-26 Majid Pahlevaninezhad Input power controller for ac/dc battery charging
CN103840514A (en) * 2013-03-18 2014-06-04 洛阳嘉盛电源科技有限公司 Multifunctional charging unit
CN204615452U (en) * 2015-05-07 2015-09-02 新际电子元件(杭州)有限公司 A kind of charger of onboard data line

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2891442Y (en) * 2005-12-29 2007-04-18 比亚迪股份有限公司 Portable charger for electric automobile
CN102064591A (en) * 2010-11-12 2011-05-18 鸥瑞智诺能源科技(北京)有限公司 Braking energy recovery system with recovery charging current directly proportional to brake voltage variation
CN102570814A (en) * 2010-12-22 2012-07-11 中兴通讯股份有限公司 Switching power supply feedback compensation method and digital signal processing device
CN102999073A (en) * 2011-09-08 2013-03-27 洛阳嘉盛电源科技有限公司 Constant-voltage and constant-current control circuit applied to power supply technology
US20130249469A1 (en) * 2012-03-21 2013-09-26 Majid Pahlevaninezhad Input power controller for ac/dc battery charging
CN103023351A (en) * 2012-12-04 2013-04-03 上海交通大学 Electric automobile charging/discharging/storing integral station power flow three-level converter
CN103840514A (en) * 2013-03-18 2014-06-04 洛阳嘉盛电源科技有限公司 Multifunctional charging unit
CN204615452U (en) * 2015-05-07 2015-09-02 新际电子元件(杭州)有限公司 A kind of charger of onboard data line

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Application publication date: 20160203