CN105576956B - Power circuit and Switching Power Supply - Google Patents

Power circuit and Switching Power Supply Download PDF

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Publication number
CN105576956B
CN105576956B CN201410618027.7A CN201410618027A CN105576956B CN 105576956 B CN105576956 B CN 105576956B CN 201410618027 A CN201410618027 A CN 201410618027A CN 105576956 B CN105576956 B CN 105576956B
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primary winding
electrically connected
voltage
electronic switch
power supply
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CN201410618027.7A
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CN105576956A (en
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李博
杜鹏
唐光明
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2015/076558 priority patent/WO2016070577A1/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/40Means for preventing magnetic saturation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

It include the first primary side winding, at least a voltage transformation unit, for carrying out the driving switch of charge and discharge control to first primary side winding and driving for output pulse width modulated signal the control chip of the driving switch on or off the invention discloses a kind of power circuit;Wherein, the first end of first primary side winding is electrically connected with power supply positive input terminal, and the second end of first primary side winding is electrically connected by the voltage transformation unit with the driving switch;The voltage transformation unit includes the second primary side winding and the voltage detecting drive module for detecting the power supply positive input terminal voltage, the voltage detecting drive module controls corresponding second primary side winding according to the power supply positive input terminal voltage and is electrically connected with the first primary side winding, to change the turn ratio of primary coil and secondary coil.The invention also discloses a kind of Switching Power Supplies.Invention prevents primary transformer coils saturation state occurs, improves the delivery efficiency of power supply.

Description

Power supply circuit and switching power supply
Technical Field
The invention relates to the technical field of power supplies, in particular to a power supply circuit and a switching power supply.
Background
As is well known, with the rapid development of informatization, people have a greater and greater dependence on electronic devices and products, which are not powered off. With the complexity of various application environments, the power supply is required to have strong adaptability, and the most important one is to be suitable for various input voltage conditions.
In order to realize a wide range of input voltages, in the prior art, two-stage voltage conversion is generally adopted in a power supply circuit, and a mode that a boosting module or a voltage reduction module is connected in series with an isolation module is adopted. However, in the case of a wide input voltage range, the duty ratio of the PWM (pulse width modulation) signal varies widely between the input high voltage and the input low voltage, so that the transformer is very easily saturated at the input low voltage, and the output efficiency is low.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to prevent the primary coil of the transformer from being in a saturated state and improve the output efficiency of a power supply.
In order to achieve the above object, the present invention provides a power supply circuit, which includes a first primary winding, at least one voltage transformation unit, a driving switch for performing charge and discharge control on the first primary winding, and a control chip for outputting a pulse width modulation signal to drive the driving switch to be turned on or off; wherein,
the first end of the first primary winding is electrically connected with the positive input end of a power supply, and the second end of the first primary winding is electrically connected with the driving switch through the voltage transformation unit;
the voltage transformation unit comprises a second primary winding and a voltage detection driving module used for detecting the voltage at the positive input end of the power supply, and the voltage detection driving module controls the corresponding second primary winding to be electrically connected with the first primary winding according to the voltage at the positive input end of the power supply so as to change the turn ratio of the primary winding to the secondary winding.
Preferably, the driving switch is a field effect transistor, a source electrode of the driving switch is grounded through a resistor, a gate electrode of the driving switch is electrically connected with the signal output end of the control chip, and a drain electrode of the driving switch is electrically connected with the second end of the first primary winding through the voltage transformation unit.
Preferably, the voltage transformation unit further includes a first electronic switch and a second electronic switch, the first electronic switch and the second electronic switch are respectively electrically connected to the voltage detection driving module, and control whether the second primary winding is electrically connected to the first primary winding to form a primary winding according to a control signal output by the voltage detection driving module detecting a voltage at a positive input terminal of the power supply, so as to change the number of turns of the primary winding, and when a plurality of second primary windings are electrically connected to the first primary winding, the second primary windings are sequentially connected in series.
Preferably, the number of the voltage transformation units is one, and the first end of the second primary winding is electrically connected with the second end of the first primary winding through a first electronic switch; the second end of the second primary winding is electrically connected with the second end of the first primary winding through a second electronic switch, and the second end of the second primary winding is electrically connected with the driving switch.
Preferably, the number of the voltage transformation units is more than one, the first end of the second primary winding is electrically connected with the second end of the previous second primary winding through the corresponding first electronic switch, and the second end of the second primary winding is electrically connected with the second end of the previous second primary winding through the corresponding second electronic switch;
when the second primary winding is the first second primary winding close to the first primary winding, the first end corresponding to the second primary winding is electrically connected with the second end of the first primary winding through a first electronic switch; the second end of the second primary winding is electrically connected with the second end of the first primary winding through a corresponding second electronic switch;
and when the second primary winding is the last second primary winding, the second end of the second primary winding is electrically connected with the driving switch.
Preferably, each of the voltage detection driving modules presets a standard voltage comparison value, and when the voltage at the positive input end of the power supply is greater than the standard voltage comparison value, the voltage detection driving module outputs a control signal to the corresponding first electronic switch and the corresponding second electronic switch to control the corresponding second primary winding to be electrically connected with the first primary winding.
Preferably, the standard voltage comparison value of each voltage detection driving module is different.
Preferably, the standard voltage comparison values of the voltage detection driving modules are sequentially and uniformly increased.
Preferably, a control signal output end of the voltage detection driving module is connected with a control end of the first electronic switch and a control end of the second electronic switch; the voltage transformation unit further comprises an inverter, wherein the inverter is connected in series between the control end of the first electronic switch and the control signal output end, or the inverter is connected in series between the control end of the second electronic switch and the control signal output end.
In addition, in order to achieve the above object, the present invention further provides a switching power supply, which includes a power supply circuit, where the power supply circuit includes a first primary winding, at least one voltage transformation unit, a driving switch for performing charge and discharge control on the first primary winding, and a control chip for outputting a pulse width modulation signal to drive the driving switch to be turned on or off; wherein,
the first end of the first primary winding is electrically connected with the positive input end of a power supply, and the second end of the first primary winding is electrically connected with the driving switch through the voltage transformation unit;
the voltage transformation unit comprises a second primary winding and a voltage detection driving module used for detecting the voltage at the positive input end of the power supply, and the voltage detection driving module controls the corresponding second primary winding to be electrically connected with the first primary winding according to the voltage at the positive input end of the power supply so as to change the turn ratio of the primary winding to the secondary winding.
According to the embodiment of the invention, the number of turns of the primary side coil is reduced when the input voltage is lower, so that the duty ratio of the pulse width modulation signal can be properly adjusted in a low-voltage state, the primary side coil of the transformer is prevented from being in a saturated state, and the output efficiency of a power supply is improved; and meanwhile, the output power of the power supply can be improved.
Drawings
FIG. 1 is a schematic circuit diagram of a power circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of another embodiment of the power circuit of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a power supply circuit, referring to fig. 1, in an embodiment, the power supply circuit includes a first primary winding 10, at least one voltage transformation unit 20, a driving switch 30 for performing charge and discharge control on the first primary winding 10, and a control chip 40 for outputting a pulse width modulation signal to drive the driving switch 30 to be turned on or off; wherein,
a first end of the first primary winding 10 is electrically connected to a positive power input VCC, and a second end of the first primary winding 10 is electrically connected to the driving switch 30 through the transformer unit 20;
the voltage transformation unit 20 includes a second primary winding 21 and a voltage detection driving module 22 for detecting a voltage at the positive input end of the power supply, and the voltage detection driving module 22 controls the corresponding second primary winding 21 to be electrically connected with the first primary winding 10 according to the positive input end VCC voltage of the power supply so as to change a turn ratio of the primary coil and the secondary coil.
In this embodiment, the first primary winding 10, the second primary winding 21 and the secondary winding 50 are disposed on the same transformer. When the second primary winding 21 is not electrically connected to the first primary winding 10, the turn ratio of the primary coil to the secondary coil is the turn ratio of the first primary winding 10 to the secondary winding 50, and when the second primary winding 21 is electrically connected to the first primary winding 10, the turn ratio of the primary coil to the secondary coil is the turn ratio of the total number of turns of the first primary winding 10 and the second primary winding 21 to the secondary winding 50.
Specifically, during operation, the voltage detection driving module 22 detects the voltage at the positive input end of the power supply, and when the voltage at the positive input end of the power supply is less than or equal to a standard voltage comparison value preset by the voltage detection driving module 22, the voltage detection driving module 22 outputs a corresponding control signal to control the second primary winding 21 to be disconnected from the first primary winding 10; when the voltage at the positive input end of the power supply is greater than the preset value of the voltage detection driving module 22, the voltage detection driving module 22 outputs a corresponding control signal to control the second primary winding 21 to be electrically connected with the first primary winding 10.
According to the embodiment of the invention, the number of turns of the primary side coil is reduced when the input voltage is lower, so that the duty ratio of the pulse width modulation signal can be properly adjusted in a low-voltage state, the primary side coil of the transformer is prevented from being in a saturated state, and the output efficiency of a power supply is improved; and meanwhile, the output power of the power supply can be improved.
It should be noted that, the structure of the driving switch 30 may be set according to actual requirements, and in this embodiment, in order to reduce power consumption, preferably, the driving switch 30 is a field effect transistor, a source of the field effect transistor is grounded through a resistor R, a gate of the field effect transistor is electrically connected to the signal output terminal of the control chip 40, and a drain of the field effect transistor is electrically connected to the second end of the first primary winding 10 through the transforming unit 20.
Further, the transformer unit 20 further includes a first electronic switch 23 and a second electronic switch 24, where the first electronic switch 23 and the second electronic switch 24 are respectively electrically connected to the voltage detection driving module 22, and control whether the second primary winding 21 is electrically connected to the first primary winding 10 to form a primary winding according to a control signal output by the voltage detection driving module 22 detecting a voltage at a positive input terminal of the power supply, so as to change the number of turns of the primary winding, and when a plurality of second primary windings 21 are electrically connected to the first primary winding 10, the second primary windings 21 are sequentially connected in series.
Specifically, the number of the transformation units 20 may be set according to actual needs, as shown in fig. 1, one transformation unit 20 is provided, as shown in fig. 2, two transformation units 20 are provided, and in other embodiments, a plurality of transformation units may be provided. When the number of the transforming units 20 is two or more, the second primary windings 21 connected to the first primary winding 10 are sequentially connected in series, thereby changing the number of turns of the primary coils. A different number of voltage transforming units 20 will be explained in detail below:
as shown in fig. 1, there is one transformer unit 20, and a first end of the second primary winding 21 is electrically connected to a second end of the first primary winding 10 through a first electronic switch 23; the second end of the second primary winding 21 is electrically connected to the second end of the first primary winding 10 through a second electronic switch 24, and the second end of the second primary winding 21 is electrically connected to the driving switch 30 (i.e., the second end of the second primary winding 21 is connected to the drain of the fet).
As shown in fig. 2, the number of the voltage transformation units is more than one, the first end of the second primary winding is electrically connected to the second end of the previous second primary winding through the corresponding first electronic switch, and the second end of the second primary winding is electrically connected to the second end of the previous second primary winding through the corresponding second electronic switch;
when the second primary winding is the first second primary winding close to the first primary winding, the first end corresponding to the second primary winding is electrically connected with the second end of the first primary winding through a first electronic switch; the second end of the second primary winding is electrically connected with the second end of the first primary winding through a corresponding second electronic switch;
and when the second primary winding is the last second primary winding, the second end of the second primary winding is electrically connected with the driving switch.
It should be noted that a standard voltage comparison value is preset in each of the voltage detection driving modules 22, and when the VCC voltage at the positive input end of the power supply is greater than the standard voltage comparison value, the voltage detection driving module 22 outputs a control signal to the corresponding first electronic switch 23 and the corresponding second electronic switch 24 to control the corresponding second primary winding 21 to be electrically connected to the first primary winding 10.
It is understood that the standard voltage comparison value of each of the voltage detection driving modules 22 is different. In the plurality of voltage transformation units 20, the standard voltage comparison value of each voltage detection driving module 22 is sequentially and uniformly increased. So that the number of turns in the primary winding can be changed in turn depending on the voltage.
Specifically, the magnitude of the comparison value of each standard voltage may be set according to actual needs, and in this embodiment, the maximum range of the input voltage may be divided into equal parts according to each standard voltage.
For example, the maximum input voltage is 120V. When there is one transforming unit 20, the standard voltage comparison value of the voltage detection driving module 22 is 60V, and when there are two transforming units 20, the standard voltage comparison value of one of the transforming units 20 is 40V, and the standard voltage comparison value of the other transforming unit 20 is 80V.
Further, based on the above embodiment, in this embodiment, the control signal output end of the voltage detection driving module 22 is connected to the control end of the first electronic switch 23 and the control end of the second electronic switch 24; the transformation unit further comprises an inverter 25, wherein the inverter 25 is connected in series between the control terminal of the first electronic switch 23 and the control signal output terminal, or the inverter 25 is connected in series between the control terminal of the second electronic switch 24 and the control signal output terminal.
In this embodiment, the inverter 25 is connected in series only between the control terminal of the first electronic switch 23 and the control signal output terminal or only between the control terminal of the second electronic switch 24 and the control signal output terminal. As shown in fig. 1 and 2, the inverter 25 is connected in series only between the control terminal of the first electronic switch 23 and the control signal output terminal. The first electronic switch 23 and the second electronic switch 24 may be turned on at a high level or at a low level. Taking high level conduction as an example for detailed description, when the voltage detection driving module 22 outputs a high level signal, the second electronic switch 24 is turned on, the first electronic switch 23 is turned off, and at this time, the second primary winding 21 is connected with the first primary winding 10 in a cut-off manner; when the voltage detection driving module 22 outputs a low level signal, the second electronic switch 24 is turned off, the first electronic switch 23 is turned on, and the second primary winding 21 is electrically connected to the first primary winding 10.
It should be noted that, in other embodiments, the first electronic switch 23 and the second electronic switch 24 may be set as reverse control switches, that is, the first electronic switch 23 is turned on at a high level, and the second electronic switch 24 is turned on at a low level; or the first electronic switch 23 is turned on at a low level, and the second electronic switch 24 is turned on at a high level; at this time, it is only necessary to connect the first electronic switch 23 and the second electronic switch 24 to the same control signal output terminal of the voltage detection driving module 22.
In addition, two control signal output terminals may be disposed on the voltage detection driving module 22 for outputting the reverse control signals to the first electronic switch 23 and the second electronic switch 24 simultaneously, so that one is turned on and the other is turned off.
Specifically, a soft start circuit (i.e., a delay start circuit) may be added to the output terminal of the inverter 25, so that a dead time point exists between the first electronic switch 23 and the second electronic switch 24, thereby ensuring the stability of the circuit.
The invention further provides a switching power supply, which includes a power supply circuit, and the structure of the power supply circuit can refer to the above embodiments, which are not described herein again. It should be understood that, since the switching power supply of the present embodiment adopts the technical solution of the power supply circuit, the switching power supply has all the beneficial effects of the power supply circuit.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (8)

1. A power supply circuit is characterized by comprising a first primary winding, at least one voltage transformation unit, a driving switch and a control chip, wherein the driving switch is used for carrying out charging and discharging control on the first primary winding, and the control chip is used for outputting a pulse width modulation signal to drive the driving switch to be switched on or switched off; wherein,
the first end of the first primary winding is electrically connected with the positive input end of a power supply, and the second end of the first primary winding is electrically connected with the driving switch through the voltage transformation unit;
the voltage transformation unit comprises a second primary winding and a voltage detection driving module for detecting the voltage at the positive input end of the power supply, and the voltage detection driving module controls the corresponding second primary winding to be electrically connected with the first primary winding according to the voltage at the positive input end of the power supply so as to change the turn ratio of the primary winding to the secondary winding;
the transformation unit further comprises a first electronic switch and a second electronic switch, and the first end of the second primary winding is electrically connected with the second end of the first primary winding through the first electronic switch; the second end of the second primary winding is electrically connected with the second end of the first primary winding through a second electronic switch, and the second end of the second primary winding is electrically connected with the driving switch;
the control signal output end of the voltage detection driving module is connected with the control end of the first electronic switch and the control end of the second electronic switch; the voltage transformation unit further comprises an inverter, wherein the inverter is connected between the control end of the first electronic switch and the control signal output end in series, or the inverter is connected between the control end of the second electronic switch and the control signal output end in series;
and the output end of the phase inverter is also provided with a delay starting circuit.
2. The power circuit of claim 1, wherein the driving switch is a field effect transistor, a source thereof is grounded through a resistor, a gate thereof is electrically connected to the signal output terminal of the control chip, and a drain thereof is electrically connected to the second terminal of the first primary winding through the transforming unit.
3. The power supply circuit according to claim 1, wherein the first electronic switch and the second electronic switch control whether the second primary winding is electrically connected to the first primary winding to form the primary winding according to a control signal output by the voltage detection driving module detecting a voltage at a positive input terminal of the power supply, so as to change the number of turns of the primary winding, and when there are a plurality of second primary windings electrically connected to the first primary winding, the second primary windings are sequentially connected in series.
4. The power circuit of claim 3, wherein the number of the transforming units is more than one, the first end of the second primary winding is electrically connected to the second end of the previous second primary winding through the corresponding first electronic switch, and the second end of the second primary winding is electrically connected to the second end of the previous second primary winding through the corresponding second electronic switch;
when the second primary winding is the first second primary winding close to the first primary winding, the first end corresponding to the second primary winding is electrically connected with the second end of the first primary winding through a first electronic switch; the second end of the second primary winding is electrically connected with the second end of the first primary winding through a corresponding second electronic switch;
and when the second primary winding is the last second primary winding, the second end of the second primary winding is electrically connected with the driving switch.
5. The power circuit as claimed in claim 4, wherein each of the voltage detection driving modules has a predetermined standard voltage comparison value, and when the voltage at the positive input terminal of the power supply is greater than the standard voltage comparison value, the voltage detection driving module outputs a control signal to the corresponding first electronic switch and the corresponding second electronic switch to control the corresponding second primary winding to be electrically connected to the first primary winding.
6. The power circuit as claimed in claim 5, wherein the standard voltage comparison values of each of the voltage detection driving modules are different.
7. The power supply circuit according to claim 6, wherein the standard voltage comparison value of each of the voltage detection driving modules increases uniformly in sequence.
8. A switching power supply comprising a power supply circuit as claimed in any one of claims 1 to 7.
CN201410618027.7A 2014-11-05 2014-11-05 Power circuit and Switching Power Supply Active CN105576956B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201410618027.7A CN105576956B (en) 2014-11-05 2014-11-05 Power circuit and Switching Power Supply
PCT/CN2015/076558 WO2016070577A1 (en) 2014-11-05 2015-04-14 Power supply circuit and switching power supply

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Application Number Priority Date Filing Date Title
CN201410618027.7A CN105576956B (en) 2014-11-05 2014-11-05 Power circuit and Switching Power Supply

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CN105576956B true CN105576956B (en) 2019-11-19

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CN118508762A (en) * 2024-07-18 2024-08-16 惠州市乐亿通科技股份有限公司 Power supply circuit and power supply device

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JP3416809B2 (en) * 1994-05-27 2003-06-16 成勲 井本 Electric regulator
US6452818B1 (en) * 2001-08-27 2002-09-17 Anastasios A. Simopoulos Self driven active clamp
US6501193B1 (en) * 2001-09-07 2002-12-31 Power-One, Inc. Power converter having regulated dual outputs
CN100550587C (en) * 2007-08-14 2009-10-14 伊博电源(杭州)有限公司 The synchronous rectification of the variable turn ratio or diode rectification converter
US8106636B2 (en) * 2008-02-22 2012-01-31 Murata Power Solutions Method and apparatus for power conversion with wide input voltage range
CN101478243B (en) * 2008-10-13 2011-05-25 北京新雷能科技股份有限公司 Switch electric power circuit with wide inputting range
CN202374182U (en) * 2011-11-25 2012-08-08 比亚迪股份有限公司 DC/DC (Direct Current/Direct Current) bidirectional converter

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