CN110912415A - Low-power-consumption isolated output household power supply - Google Patents
Low-power-consumption isolated output household power supply Download PDFInfo
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- CN110912415A CN110912415A CN201911269406.9A CN201911269406A CN110912415A CN 110912415 A CN110912415 A CN 110912415A CN 201911269406 A CN201911269406 A CN 201911269406A CN 110912415 A CN110912415 A CN 110912415A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a low-power consumption isolated output household power supply, which comprises a main power supply circuit and a secondary power supply conversion circuit, wherein the main power supply circuit is connected with the secondary power supply conversion circuit; the main power supply circuit consists of a main power supply input circuit, a voltage stabilization feedback circuit, an RCD absorption circuit, a filter circuit and a main power supply output circuit; the main power input circuit comprises a switching tube, a control chip, a comparator, an undervoltage protection resistor, an overvoltage protection resistor and an optical coupler; the main power supply circuit isolates and converts high-voltage direct current input in a wide range into two paths of low-voltage direct current of +12V and +5.6V, and the secondary power supply performs full-bridge inversion, transformer isolation and rectification filtering on the direct current of +12V output by the main power supply to convert the direct current of +5V and +15V into direct current which is used as an IGBT driving power supply and a signal secondary power supply conversion circuit power supply; meanwhile, the +5.6V direct current output by the main power supply is converted into +5V and +3.3V direct current through transformers with different windings and a low-voltage-difference linear voltage stabilizer from the power supply, so that power is supplied to an ADC reference power supply in an IGBT, an integrated operational amplifier and a DSP.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a low-power-consumption isolated output household power supply.
Background
At present, photovoltaic power generation is mainly characterized in that direct current output by a solar cell panel is inverted into alternating current, and the alternating current is measured by an electric meter measuring device and then is transmitted to a power grid for household power utilization equipment and other loads of the power grid.
On one hand, the photovoltaic power generation system generally needs a storage battery as an energy storage device, so the whole system has high manufacturing cost, the service life of the storage battery is usually several years, and the scrapped storage battery can pollute the environment;
on the other hand, the grid-connected photovoltaic inverter is provided aiming at the defects of the photovoltaic power generation system which operates independently, a storage battery can be omitted, although the power generation system can reduce the manufacturing cost after the storage battery is omitted, the better environmental protection performance is achieved, the manufacturing cost is higher, the working range is small, the output voltage of the power supply can not be directly used by a controller, an IGBT driver, an integrated operational amplifier and an ADC of a DSP in the inverter, and needs to be converted into a low-voltage power supply needed by the DSP controller through a DC/DC module.
Disclosure of Invention
The invention aims to provide a low-power-consumption isolated output household power supply to solve the problems in the background technology.
The invention provides a low-power consumption isolated output household power supply, which comprises a main power circuit and a secondary power conversion circuit;
the main power supply circuit consists of a main power supply input circuit, a voltage stabilization feedback circuit, an RCD absorption circuit, a filter circuit and a main power supply output circuit;
the main power input circuit comprises a switching tube, a control chip, a comparator, an undervoltage protection resistor, an overvoltage protection resistor and an optical coupler; the comparator is formed by cascade connection of a first-stage comparator and a second-stage comparator; undervoltage protection resistance comprises resistance R1 series connection resistance R2, and overvoltage protection resistance comprises resistance R3 series connection resistance R4, undervoltage resistance's the anodal input of second grade comparator is connected to the middle partial pressure basic point electricity, overvoltage resistance's the negative pole input of one-level comparator is connected to the middle partial pressure basic point electricity, be equipped with emitting diode and phototransistor in the optocoupler, and emitting diode's positive pole is connected with second grade comparator output electricity through series connection resistance R6, and phototransistor's collecting electrode electricity connection control chip, and control chip output electricity connecting switch pipe, this main power input circuit mainly realizes excessive pressure and undervoltage protection function.
The stabilized voltage feedback circuit includes: the circuit comprises a sampling resistor, a voltage stabilizer, an RC circuit and an optical coupler;
the voltage division node of the sampling resistor is electrically connected with the input end of a voltage stabilizer, the voltage stabilizer is connected with an RC circuit formed by connecting a capacitor C1 in series with a resistor R3 in parallel, and the negative end of the voltage stabilizer is electrically connected with an optical coupler through a resistor R5; the whole circuit can realize output voltage stabilization.
The RCD absorption circuit includes: the circuit comprises an absorption capacitor, a power switch tube, a rectifier diode, a transformer and a transient suppression diode;
the absorption capacitor C1 is connected with the resistor R2 in series to form an RC circuit, the RC circuit is connected with the transient suppression diode in parallel, two ends of the transient suppression diode are connected with the resistor R1 in parallel, the anode of the rectifier diode is electrically connected with the transient suppression diode, the cathode of the rectifier diode is electrically connected with the power switch tube, and the collector of the power switch tube is electrically connected with the transformer; the initial voltage of the absorption capacitor C1 is zero, when the drain voltage of the power switch tube exceeds the input voltage, the absorption capacitor starts to charge, and the energy in the peak is absorbed, so that the voltage at two ends of the power switch tube is relieved, and the safe operation of the power switch tube is effectively protected.
The filter circuit includes: the fuse protector comprises a fuse, a direct current filter inductor, an energy storage capacitor and a ceramic capacitor;
the fuse sets up in filter circuit's initial input for the restriction input surge current, fuse series connection direct current filter inductance, the switching noise that the group stopped switching power supply during operation produced concatenates the direct current input side, and direct current filter inductance parallel connection energy storage capacitor and ceramic capacitor, and energy storage capacitor is used for the direct current voltage of smooth input, the high frequency noise that ceramic capacitor filtering direct current input side and switching power supply during operation produced.
The main power output circuit consists of a coil, a rectifier diode, a low-pass filter and a pi-type filter; the low-pass filter is composed of a power inductor and a filter capacitor which are connected in parallel, the pi-type filter is composed of electrolytic capacitors which are connected in parallel at two ends of the power inductor, the rectifier diodes comprise a first rectifier diode and a second rectifier diode, the first rectifier diode and the second rectifier diode are respectively and electrically connected to the tail end of a secondary winding of the coil and the middle output end, different voltage transformation is achieved, 12V voltage is output all the way, 5.6V voltage is output all the way, the positive electrode of the first diode is electrically connected with the low-pass filter, the positive electrode of the second rectifier tube is electrically connected with the pi-type filter, the capacitance value of the electrolytic capacitors in the pi-type filter is large, the electrolytic capacitors are used for reducing output voltage ripples, the power inductor of the low-pass filter is used for filtering output current.
The slave power supply conversion circuit comprises a transformer, a half-bridge rectification circuit, a pi-type filter, a low-dropout linear regulator and a filter capacitor;
the secondary output end of the transformer is electrically connected with the half-bridge rectifying circuit, the output end of the half-bridge rectifying circuit is electrically connected with the pi-type filter, the output end of the pi-type filter is electrically connected with the low dropout linear regulator, and the low dropout linear regulator is output by a filter capacitor C5 connected in parallel; the 12V square wave output by the main power supply circuit is subjected to full-wave rectification of a half-bridge rectification circuit after passing through a transformer, is filtered by a pi-type filter and then is input to the low-dropout linear regulator, and the 5.6V power supply output by the main power supply secondary is directly input to the low-dropout linear regulator and outputs 3.3V after being filtered by LC of the pi-type filter, so that the power supply of an IGBT, an integrated operational amplifier and an ADC reference power supply in a DSP is realized.
Has the advantages that: the main power supply circuit isolates and converts high-voltage direct current input in a wide range into two paths of low-voltage direct current of +12V and +5.6V, and the secondary power supply performs full-bridge inversion, transformer isolation and rectification filtering on the direct current of +12V output by the main power supply to convert the direct current of +5V and +15V into direct current which is used as an IGBT driving power supply and a signal secondary power supply conversion circuit power supply; meanwhile, the +5.6V direct current output by the main power supply is converted into +5V and +3.3V direct current through the transformers with different windings and the low-voltage-difference linear voltage stabilizer from the power supply, so that power is supplied to the IGBT, the integrated operational amplifier and the ADC reference power supply in the DSP, and low cost, high efficiency and wide working range are realized.
Drawings
FIG. 1 is a diagram of a main power input circuit of the present invention;
FIG. 2 is a schematic diagram of a voltage regulation feedback circuit of the present invention;
FIG. 3 is a schematic diagram of the RCD absorption circuit of the present invention;
FIG. 4 is a diagram of a filter circuit according to the present invention;
FIG. 5 is a diagram of the main power output circuit of the present invention;
FIG. 6 is a circuit diagram of the slave power conversion circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the invention.
Referring to fig. 1, the invention provides a low-power consumption isolated output household power supply, comprising a main power circuit and a slave power conversion circuit;
the main power supply circuit consists of a main power supply input circuit, a voltage-stabilizing feedback circuit, an RCD absorption circuit, a filter circuit and a main power supply output circuit, wherein the main power supply input circuit comprises a switching tube, a control chip, a comparator, an undervoltage protection resistor, an overvoltage protection resistor and an optical coupler;
the comparator is formed by cascade connection of a first-stage comparator and a second-stage comparator;
the undervoltage protection resistor is composed of a resistor R1 series connection resistor R2, the overvoltage protection resistor is composed of a resistor R3 series connection resistor R4, the middle voltage division base point of the undervoltage resistor is electrically connected with the positive electrode input end of the secondary comparator, the middle voltage division base point of the overvoltage resistor is electrically connected with the negative electrode input end of the primary comparator,
a light emitting diode and a photosensitive transistor are arranged in the optical coupler, the anode of the light emitting diode is electrically connected with the output end of the secondary comparator through a series resistor R6, the collector of the photosensitive transistor is electrically connected with the control chip, and the output end of the control chip is electrically connected with the switching tube;
the current voltage of the undervoltage protection resistor and the overvoltage protection resistor acquisition bus is compared through a voltage reference of the primary comparator and then provided for the cathode of the light-emitting diode of the optical coupler, when the circuit has overvoltage or undervoltage conditions, the diode is conducted by overvoltage to emit light, and the photosensitive transistor inside the optical coupler is also conducted, so that the potential of the pin of the enabling control end of the control chip is pulled down, the control chip is locked, a control signal is not sent to stop working of the switch tube, and the functions of overvoltage protection and undervoltage protection are realized.
Referring to fig. 2, the stabilized voltage feedback circuit includes: the circuit comprises a sampling resistor, a voltage stabilizer, an RC circuit and an optical coupler;
the voltage division node of the sampling resistor is electrically connected with the input end of a voltage stabilizer, the voltage stabilizer is connected with an RC circuit formed by connecting a capacitor C1 in series with a resistor R3 in parallel, and the negative end of the voltage stabilizer is electrically connected with an optical coupler through a resistor R5;
sampling resistance R1, the output voltage of partial pressure node is gathered to R2, compare with the inside 2.5V's of stabiliser voltage reference, the break-make that just can control the stabiliser through the comparison of external input voltage and this reference voltage, two other pins of stabiliser switch on, the inside diode of optical coupler that is connected with it switches on and gives out light, the photosensitive transistor sensitization of the inside of opto-coupler switches on, thereby pull down control chip's feedback control end potential, the chip is inside to stop sending current control waveform, output steady voltage just can be realized to whole circuit.
Referring to fig. 3, the RCD absorption circuit includes: the circuit comprises an absorption capacitor, a power switch tube, a rectifier diode, a transformer and a transient suppression diode;
the absorption capacitor C1 is connected with the resistor R2 in series to form an RC circuit, the RC circuit is connected with the transient suppression diode in parallel, two ends of the transient suppression diode are connected with the resistor R1 in parallel, the anode of the rectifier diode is electrically connected with the transient suppression diode, the cathode of the rectifier diode is electrically connected with the power switch tube, and the collector of the power switch tube is electrically connected with the transformer;
the initial voltage of the absorption capacitor C1 is zero, when the drain voltage of the power switch tube exceeds the input voltage, the absorption capacitor starts to charge to absorb the energy in the peak, the transient suppression diode and the resistor are connected in parallel at two ends of the RC circuit to quickly absorb the peak, and the capacitor is charged until the voltage of the drain or the collector returns to zero; when the power switch tube is turned off, the primary voltage of the transformer is reversed at the moment when the rectifier diode is not conducted, the voltage at two ends of the power switch tube is increased, and the voltage spike generated at the primary side of the transformer is absorbed through the RC circuit, so that the voltage at two ends of the power switch tube is relieved, and the safe operation of the power switch tube is effectively protected.
Referring to fig. 4, the filter circuit includes: the fuse protector comprises a fuse, a direct current filter inductor, an energy storage capacitor and a ceramic capacitor;
the fuse sets up in filter circuit's initial input for the restriction input surge current, fuse series connection direct current filter inductance, the switching noise that the group stopped switching power supply during operation produced concatenates the direct current input side, and direct current filter inductance parallel connection energy storage capacitor and ceramic capacitor, and energy storage capacitor is used for the direct current voltage of smooth input, the high frequency noise that ceramic capacitor filtering direct current input side and switching power supply during operation produced.
Referring to fig. 5, the main power output circuit is composed of a coil, a rectifier diode, a low pass filter, and a pi-type filter; the low-pass filter is composed of a power inductor and a filter capacitor which are connected in parallel, the pi-type filter is composed of electrolytic capacitors which are connected in parallel at two ends of the power inductor, the rectifier diodes comprise a first rectifier diode and a second rectifier diode, the first rectifier diode and the second rectifier diode are respectively and electrically connected to the tail end of a secondary winding of the coil and the middle output end, different voltage transformation is achieved, 12V voltage is output all the way, 5.6V voltage is output all the way, the positive electrode of the first diode is electrically connected with the low-pass filter, the positive electrode of the second rectifier tube is electrically connected with the pi-type filter, the capacitance value of the electrolytic capacitors in the pi-type filter is large, the electrolytic capacitors are used for reducing output voltage ripples, the power inductor of the low-pass filter is used for filtering output current.
Referring to fig. 6, the slave power conversion circuit includes a transformer, a half-bridge rectification circuit, a pi-type filter, a low dropout linear regulator, and a filter capacitor;
the secondary output end of the transformer is electrically connected with the half-bridge rectifying circuit, the output end of the half-bridge rectifying circuit is electrically connected with the pi-type filter, the output end of the pi-type filter is electrically connected with the low dropout linear regulator, and the low dropout linear regulator is output by a filter capacitor C5 connected in parallel; the 12V square wave output by the main power supply circuit passes through a transformer, then is subjected to full-wave rectification by a half-bridge rectification circuit, and then is input to a low-dropout linear regulator after being filtered by a pi-type filter, wherein the voltage drop of the low-dropout linear regulator is 150MV when being output, the quiescent current is as low as 45u A, the output voltage range can be adjusted to 0.9V-6.2V, the analog 5V output can be realized, the analog 5V output can be directly supplied to the front end of an optical isolation operational amplifier for use, and a 5.6V power supply output from the secondary side of the main power supply is directly input to the low-dropout linear regulator to output 3.3V after being filtered by LC of the pi-type filter, so that the power supply of.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. A low-power consumption keeps apart domestic power supply of output which characterized in that: the method comprises the following steps: a master power supply circuit and a slave power supply conversion circuit;
the main power supply circuit consists of a main power supply input circuit, a voltage stabilization feedback circuit, an RCD absorption circuit, a filter circuit and a main power supply output circuit;
the main power input circuit comprises a switching tube, a control chip, a comparator, an undervoltage protection resistor, an overvoltage protection resistor and an optical coupler;
the comparator is formed by cascade connection of a first-stage comparator and a second-stage comparator;
a light emitting diode and a photosensitive transistor are arranged in the optical coupler;
the stabilized voltage feedback circuit includes: the circuit comprises a sampling resistor, a voltage stabilizer, an RC circuit and an optical coupler;
the voltage dividing node of the sampling resistor is electrically connected with the input end of the voltage stabilizer and is connected with the output end of the voltage stabilizer,
the voltage stabilizer is connected with an RC circuit formed by a capacitor C1 and a resistor R3 in series in parallel, and the negative electrode end of the voltage stabilizer is electrically connected with the optical coupler through a resistor R5;
the RCD absorption circuit includes: the circuit comprises an absorption capacitor, a power switch tube, a rectifier diode, a transformer and a transient suppression diode;
the absorption capacitor forms an RC circuit through a series resistor, the RC circuit is connected with a transient suppression diode in parallel, the anode of the rectifier diode is electrically connected with the transient suppression diode, and the cathode of the rectifier diode is electrically connected with the power switch tube;
the filter circuit includes: the fuse protector comprises a fuse, a direct current filter inductor, an energy storage capacitor and a ceramic capacitor;
the fuse is arranged at the initial input end of the filter circuit, the fuse is connected with a direct current filter inductor in series, and the direct current filter inductor is connected with an energy storage capacitor and a ceramic capacitor in parallel;
the main power output circuit consists of a coil, a rectifier diode, a low-pass filter and a pi-type filter;
the low-pass filter is formed by connecting a power inductor with a filter capacitor in parallel and filters out output current noise; and the number of the first and second electrodes,
the pi-type filter is formed by connecting electrolytic capacitors at two ends of a power inductor in parallel, and is used for filtering voltage noise;
the slave power supply conversion circuit comprises a transformer, a half-bridge rectification circuit, a pi-type filter, a low-dropout linear regulator and a filter capacitor;
and the secondary output end of the transformer is electrically connected with the half-bridge rectifying circuit, the output end of the half-bridge rectifying circuit is electrically connected with the pi-type filter, the output end of the pi-type filter is electrically connected with the low-dropout linear voltage regulator, and the low-dropout linear voltage regulator is connected with the filter capacitor in parallel.
2. A low power consumption isolated output domestic power supply according to claim 1, further comprising: the undervoltage protection resistor is formed by connecting a resistor R1 with a resistor R2 in series; and the number of the first and second electrodes,
the overvoltage protection resistor is formed by connecting a resistor R3 in series with a resistor R4;
the middle voltage division base point of the undervoltage resistor is electrically connected with the positive input end of the secondary comparator, and the middle voltage division base point of the overvoltage resistor is electrically connected with the negative input end of the primary comparator.
3. A low power consumption isolated output domestic power supply according to claim 1, further comprising: the anode of the light emitting diode is electrically connected with the output end of the two-stage comparator through a series resistor R6; and the number of the first and second electrodes,
and the collector electrode of the phototransistor is electrically connected with the control chip, and the output end of the control chip is electrically connected with the switching tube.
4. A low power consumption isolated output domestic power supply according to claim 1, further comprising: and the collector electrode of the power switch tube is electrically connected with the transformer, and when the drain voltage of the power switch tube exceeds the input voltage, the absorption capacitor starts to charge.
5. A low power consumption isolated output domestic power supply according to claim 1, further comprising: the rectifier diode comprises a first rectifier diode and a second rectifier diode; and the number of the first and second electrodes,
the first rectifying diode and the second rectifying diode are respectively and electrically connected with the tail end of the secondary winding of the coil and the middle output end, one path outputs 12V voltage, and the other path outputs 5.6V voltage.
6. A low power consumption isolated output domestic power supply according to claim 5, further comprising: the positive electrode of the first diode is electrically connected with the low-pass filter, and the positive electrode of the second rectifier tube is electrically connected with the pi-type filter, wherein the capacitance value of an electrolytic capacitor in the pi-type filter is 1000 uF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911269406.9A CN110912415A (en) | 2019-12-11 | 2019-12-11 | Low-power-consumption isolated output household power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911269406.9A CN110912415A (en) | 2019-12-11 | 2019-12-11 | Low-power-consumption isolated output household power supply |
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| CN110912415A true CN110912415A (en) | 2020-03-24 |
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| CN201911269406.9A Pending CN110912415A (en) | 2019-12-11 | 2019-12-11 | Low-power-consumption isolated output household power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039879A (en) * | 2017-12-28 | 2018-05-15 | 郑州天舜电子技术有限公司 | A kind of intelligent electric power controlling switch circuit |
| CN112165256A (en) * | 2020-10-30 | 2021-01-01 | 杭州海兴电力科技股份有限公司 | DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter |
| CN113565661A (en) * | 2021-07-23 | 2021-10-29 | 武汉天富海科技发展有限公司 | Electromagnetic valve drive control device of intelligent electric control booster pump |
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| CN112165256A (en) * | 2020-10-30 | 2021-01-01 | 杭州海兴电力科技股份有限公司 | DC-to-DC isolating switch power supply system for three-phase multifunctional electric energy meter |
| CN113565661A (en) * | 2021-07-23 | 2021-10-29 | 武汉天富海科技发展有限公司 | Electromagnetic valve drive control device of intelligent electric control booster pump |
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Application publication date: 20200324 |