CN114944763B - Switching power supply frequency regulating circuit - Google Patents
Switching power supply frequency regulating circuit Download PDFInfo
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- CN114944763B CN114944763B CN202210877396.2A CN202210877396A CN114944763B CN 114944763 B CN114944763 B CN 114944763B CN 202210877396 A CN202210877396 A CN 202210877396A CN 114944763 B CN114944763 B CN 114944763B
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—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 with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
- H02M1/0048—Circuits or arrangements for reducing losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a switching power supply frequency regulating circuit, which comprises a current detection amplifying circuit, a reference comparison circuit and an isolation transmission and frequency regulating circuit, wherein a current detection end C, D of the current detection amplifying circuit is used for being connected with a current detection circuit of a controlled switching power supply, an output end of the current detection amplifying circuit is connected with the reference comparison circuit, an output end of the reference comparison circuit is connected with the isolation transmission and frequency regulating circuit, and an output control end A, B of the isolation transmission and frequency regulating circuit is used for being connected with a frequency setting pin of a control chip of the controlled switching power supply. The invention controls and changes the switching frequency of the controlled switching power supply by detecting the current of the controlled switching power supply, thereby effectively reducing the standby power consumption of the switching power supply and improving the light load efficiency.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a switching power supply frequency adjusting circuit.
Background
With the continuous development of power electronic technology, the performance requirements on power supply technology are higher, and the switching power supply is developed towards miniaturization, light weight, high efficiency, rapid dynamic response and the like. One of the main approaches to achieving these performance improvements is to increase the switching frequency of the switching power supply. The switching frequency of many switching power supplies in the industry at present has reached several hundred kilohertz, some even several megahertz. A problem is also posed while reducing the size and weight of the switching power supply: when the power supply is in light load or standby, the problems of low light load efficiency and high standby power consumption of the switching power supply are caused due to high switching frequency and large switching loss. In order to solve the problem, one way of industry is to use a special control chip with a no-load frequency hopping mode, and the chip can convert the switching frequency into a lower frequency when the chip is in no-load, so that the problems of large no-load power consumption and low efficiency of the switching power supply are better solved, but the chip is generally expensive, and the frequency of the no-load power supply is preset and can not be adjusted, so that the use is inconvenient.
Disclosure of Invention
The invention aims to provide a low-cost switching power supply frequency regulating circuit to solve the technical problems of large no-load power consumption and low efficiency of a switching power supply in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme for solving the problem:
a switching power supply frequency regulating circuit comprises a current detection amplifying circuit, a reference comparison circuit and an isolation transmission and frequency regulating circuit, wherein a current detection end C, D of the current detection amplifying circuit is used for being connected with a current detection circuit of a controlled switching power supply, the output end of the current detection amplifying circuit is connected with the reference comparison circuit, the output end of the reference comparison circuit is connected with the isolation transmission and frequency regulating circuit, and an output control end A, B of the isolation transmission and frequency regulating circuit is used for being connected with a frequency setting pin of a controlled switching power supply control chip.
Further, the current detection amplifying circuit comprises resistors R7-R9, an operational amplifier U2B and capacitors C2-C4; the reference comparison circuit comprises resistors R4-R6, an operational amplifier U2A and a capacitor C1; the isolation transmission and frequency regulation circuit comprises resistors R1-R3 and a photoelectric coupler U1; wherein:
the current detection end C, D of the current detection amplifying circuit is connected with an output stage current detection circuit of the controlled switch power supply, and the output control end A, B of the isolation transmission and frequency regulation circuit is connected with a frequency setting pin of a controlled switch power supply control chip;
the collector of the photoelectric coupler U1 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with an output control end A; an emitter of the photoelectric coupler U1 is connected with the output control end B; the positive pole of the photoelectric coupler U1 is connected with one end of the resistor R2 and one end of the resistor R3; the cathode of the photoelectric coupler U1 is connected with the other end of the resistor R2 and is grounded together; the other end of the resistor R3 is connected with a pin 1 at the output end of the operational amplifier U2A;
the pin 2 of the negative input end of the operational amplifier U2A is connected with one end of a resistor R4 and one end of a resistor R5; the positive input end 3 pins of the operational amplifier U2A is connected with one end of a resistor R6; the other end of the resistor R5 is grounded;
a power end 8 pin of the operational amplifier U2A is connected with a reference power supply Vref, one end of a capacitor C1 and one end of a resistor R4; the other end of the capacitor C1 is grounded;
the 4 pin of the grounding end of the operational amplifier U2A is grounded;
the pin 7 of the output end of the operational amplifier U2B is connected with the other end of the R6, one end of the capacitor C2 and one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of a resistor R7;
a pin 6 of the negative input end of the operational amplifier U2B, one end of a resistor R8, the other end of a resistor R7 and the other end of a capacitor C3; the other end of the resistor R8 is connected with the current detection end D and is grounded together;
the 5-pin end of the positive input end of the operational amplifier U2B is connected with one end of a resistor R9; the other end of the resistor R9 is connected with one end of the capacitor C4 and the current detection end C; the other end of the capacitor C4 is grounded.
Further, the current detection amplifying circuit comprises resistors R7-R9, an operational amplifier U2B and capacitors C2-C4; the reference comparison circuit comprises resistors R4-R6, an operational amplifier U2A and a capacitor C1; the isolation transmission and frequency regulation circuit comprises resistors R1-R3 and a triode Q1; wherein:
the current detection end C, D of the current detection amplifying circuit is connected with an input-stage current detection circuit of the controlled switching power supply, and the output control end A, B of the isolation transmission and frequency regulation circuit is connected with a frequency setting pin of a control chip of the controlled switching power supply;
the collector of the triode Q1 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with an output control end A; an emitting electrode of the triode Q1 is connected with the ground end and the output control end B; the base of the triode Q1 is connected with one end of the resistor R2 and one end of the resistor R3; the other end of the resistor R2 is grounded; the other end of the resistor R3 is connected with a pin 1 at the output end of the operational amplifier U2A;
a pin 2 at the negative input end of the operational amplifier U2A is connected with one end of a resistor R4 and one end of a resistor R5; the positive input end 3 pins of the operational amplifier U2A is connected with one end of a resistor R6; the other end of the resistor R5 is grounded;
the 8 pins of the power end of the operational amplifier U2A are connected with a reference power supply Vref, one end of a capacitor C1 and the other end of a resistor R4; the other end of the capacitor C1 is grounded;
the 4 pin of the grounding end of the operational amplifier U2A is grounded;
the pin 7 of the output end of the operational amplifier U2B is connected with the other end of the R6, one end of the capacitor C2 and one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of a resistor R7;
a pin 6 at the negative input end of the operational amplifier U2B is connected with one end of a resistor R8, the other end of a resistor R7 and the other end of a capacitor C3; the other end of the resistor R8 is connected with the current detection end D and is grounded together;
the 5-pin end of the positive input end of the operational amplifier U2B is connected with one end of a resistor R9; the other end of the resistor R9 is connected with one end of the capacitor C4 and the current detection end C; the other end of the capacitor C4 is grounded.
Compared with the prior art, the invention has the following technical effects:
the current detection end C, D and the output control end A, B are respectively connected with the current detection circuit of the controlled switching power supply and the frequency setting pin of the control chip, so that the working state of the controlled switching power supply is judged according to the current of the controlled switching power supply, and meanwhile, the working frequency of the switching power supply can be adjusted by using the impedance change generated by the current of the controlled switching power supply, so that the switching power supply has higher efficiency and lower standby power consumption under the conditions of light load and standby.
The switching power supply frequency regulating circuit provided by the invention has the advantages of easy realization of structure, low cost, flexible and convenient isolation and use of the detection signal and the control signal ground wire, is suitable for most switching power supply topologies and switching power supply chips, can effectively reduce the standby power consumption of the switching power supply and improve the light load efficiency, and is a switching power supply frequency regulating circuit with excellent and practical performance.
Drawings
Fig. 1 is a block diagram of a switching power supply frequency adjustment circuit according to the present invention;
fig. 2 is a circuit diagram of a switching power supply frequency adjustment circuit disclosed in embodiment 1 of the present invention;
fig. 3 is a circuit diagram of a switching power supply frequency adjustment circuit disclosed in embodiment 3 of the present invention;
fig. 4 is an overall circuit diagram of the switching power supply frequency adjustment circuit disclosed in embodiment 1 of the present invention connected to a controlled switching power supply;
fig. 5 is an overall circuit diagram of the switching power supply frequency adjustment circuit disclosed in embodiment 2 of the present invention connected to a controlled switching power supply;
fig. 6 is an overall circuit diagram of the switching power supply frequency adjustment circuit disclosed in embodiment 3 of the present invention connected to a controlled switching power supply.
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
As shown in fig. 1, the switching power supply frequency adjusting circuit of the present invention includes a current detection amplifying circuit, a reference comparing circuit and an isolation transmission and frequency adjusting circuit, wherein a current detection end C, D of the current detection amplifying circuit is used for connecting with a current detection circuit of a controlled switching power supply, an output end of the current detection amplifying circuit is connected with the reference comparing circuit, an output end of the reference comparing circuit is connected with the isolation transmission and frequency adjusting circuit, and an output control end A, B of the isolation transmission and frequency adjusting circuit is used for connecting with a frequency setting pin of a control chip of the controlled switching power supply.
The current detection amplifying circuit is used for collecting a current signal of a current detection circuit of the controlled switching power supply, amplifying the current signal and then sending the amplified signal to the reference comparison circuit; the reference comparison circuit is used for comparing the amplified signal sent by the current detection amplifying circuit and outputting a control signal, and then sending the control signal to the isolation transmission and frequency regulation circuit; the isolation transmission and frequency adjustment circuit is used for generating impedance change according to the control signal sent by the reference comparison circuit, and adjusting the frequency setting pin impedance of the controlled switching power supply control chip by using the impedance change to change the switching frequency of the controlled switching power supply.
Specifically, as shown in fig. 2 and 3, the current detection amplifying circuit includes resistors R7 to R9, an operational amplifier U2B, and capacitors C2 to C4; the reference comparison circuit comprises resistors R4-R6, an operational amplifier U2A and a capacitor C1; the isolation transmission and frequency regulation circuit comprises resistors R1-R3 and a photoelectric coupler U1 or a triode Q1.
Example 1:
in a first preferred embodiment of the present invention, the present embodiment provides a switching power supply frequency adjusting circuit shown in fig. 2, which includes resistors R1 to R9, capacitors C1 to C4, a photocoupler U1, and operational amplifiers U2A and U2B. As shown in fig. 4, the current detection terminal C, D of the current detection amplifying circuit is connected to the output stage current detection circuit of the controlled switching power supply, and the output control terminal A, B of the isolated transmission and frequency adjustment circuit is connected to the frequency setting pin of the controlled switching power supply control chip. The concrete form is as follows:
the collector of the photoelectric coupler U1 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with an output control end A; an emitter of the photoelectric coupler U1 is connected with the output control end B; the positive pole of the photoelectric coupler U1 is connected with one end of the resistor R2 and one end of the resistor R3; the cathode of the photoelectric coupler U1 is connected with the other end of the resistor R2 and is grounded together; the other end of the resistor R3 is connected with a pin 1 at the output end of the operational amplifier U2A;
a pin 2 at the negative input end of the operational amplifier U2A is connected with one end of the resistor R4 and one end of the resistor R5; the positive input end 3 pins of the operational amplifier U2A is connected with one end of a resistor R6; the other end of the resistor R5 is grounded;
a power supply end 8 pin of the operational amplifier U2A is connected with a reference power supply Vref, one end of a capacitor C1 and one end of a resistor R4; the other end of the capacitor C1 is grounded;
4 pins of the grounding end of the operational amplifier U2A are grounded;
the pin 7 of the output end of the operational amplifier U2B is connected with the other end of the R6, one end of the capacitor C2 and one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of a resistor R7;
a pin 6 of a negative input end of the operational amplifier U2B, one end of a resistor R8, the other end of a resistor R7 and the other end of a capacitor C3; the other end of the resistor R8 is connected with the current detection end D and is grounded together;
the 5-pin end of the positive input end of the operational amplifier U2B is connected with one end of a resistor R9; the other end of the resistor R9 is connected with one end of the capacitor C4 and the current detection end C; the other end of the capacitor C4 is grounded.
The detailed working process of the embodiment is as follows: the current detection terminal C, D is connected to a current detection circuit of the controlled switching power supply, when the load current of the controlled switching power supply changes, a load current signal is amplified by a current detection amplifying circuit composed of an operational amplifier U2B, resistors R7 to R9, and capacitors C2 to C4, the amplified signal is sent to a reference comparing circuit composed of resistors R4 to R6, an operational amplifier U2A, and a capacitor C1, the amplified signal is sent to the positive input terminal 3 pin of the operational amplifier U2A through the resistor R6, the negative input terminal 2 pin of the operational amplifier U2A sets a preset voltage through a reference power supply Vref, the resistor R4, and the resistor R5 (for example: 0.02V), the operational amplifier U2A outputs a control signal by comparing the voltage intensity of the positive input end and the negative input end, the control signal is sent into an isolation transmission and frequency regulation circuit consisting of resistors R1-R3 and a photoelectric coupler U1, the control signal is sent into an LED tube in the photoelectric coupler U1 after being subjected to voltage division by the resistors R2 and R3, the LED tube emits light according to the intensity of the control signal, a photosensitive triode in the photoelectric coupler U1 receives the light emitting intensity of the LED tube and generates corresponding impedance change, the impedance change adjusts the frequency of a controlled switching power supply control chip through the resistor R1 and an output control end A, B to set pin impedance, and therefore the switching frequency of the controlled switching power supply is changed.
Example 2:
as shown in fig. 5, the second preferred embodiment of the present invention is the same as the switching power supply frequency adjusting circuit provided in the first preferred embodiment, except that in this embodiment, the topology of the controlled switching power supply circuit connected to the switching power supply frequency adjusting circuit of this embodiment is a forward circuit, and the topology of the controlled switching power supply circuit in embodiment 1 is a flyback circuit.
Example 3:
regarding the third preferred embodiment of the present invention, similar to the control principle of the first preferred embodiment, there are two differences: (1) The current detection terminal C, D of the current detection amplifying circuit is connected with the input stage current detection circuit of the controlled switching power supply, while the output stage current detection circuit of the controlled switching power supply is connected in the embodiment 1 (see fig. 6); (2) An optical coupling circuit composed of a photoelectric coupler U1 in the isolated transmission and frequency regulation circuit is replaced by a triode circuit composed of a triode Q1 (see fig. 3 and 6). Compared with the circuit in the embodiment 1, the circuit in the embodiment is simpler and more suitable for a switching power supply circuit which needs to control the switching frequency and is not isolated by collecting the input-stage current. The concrete form is as follows:
the collector of the triode Q1 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with an output control end A; an emitting electrode of the triode Q1 is connected with the ground end and the output control end B; the base electrode of the triode Q1 is connected with one end of the resistor R2 and one end of the resistor R3; the other end of the resistor R2 is grounded; the other end of the resistor R3 is connected with a pin 1 at the output end of the operational amplifier U2A;
the pin 2 of the negative input end of the operational amplifier U2A is connected with one end of a resistor R4 and one end of a resistor R5; the positive input end 3 pins of the operational amplifier U2A is connected with one end of a resistor R6; the other end of the resistor R5 is grounded;
a power supply end 8 pin of the operational amplifier U2A is connected with a reference power supply Vref, one end of a capacitor C1 and the other end of a resistor R4; the other end of the capacitor C1 is grounded;
the 4 pin of the grounding end of the operational amplifier U2A is grounded;
a pin 7 of an output end of the operational amplifier U2B is connected with the other end of the R6, one end of the capacitor C2 and one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of a resistor R7;
a pin 6 at the negative input end of the operational amplifier U2B is connected with one end of a resistor R8, the other end of a resistor R7 and the other end of a capacitor C3; the other end of the resistor R8 is connected with a current detection end D and is grounded together;
the 5-pin end of the positive input end of the operational amplifier U2B is connected with one end of a resistor R9; the other end of the resistor R9 is connected with one end of the capacitor C4 and the current detection end C; the other end of the capacitor C4 is grounded.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention.
Claims (1)
1. A switching power supply frequency regulating circuit is characterized by comprising a current detection amplifying circuit, a reference comparison circuit and an isolation transmission and frequency regulating circuit, wherein a current detection end C, D of the current detection amplifying circuit is used for being connected with a current detection circuit of a controlled switching power supply, an output end of the current detection amplifying circuit is connected with the reference comparison circuit, an output end of the reference comparison circuit is connected with the isolation transmission and frequency regulating circuit, and an output control end A, B of the isolation transmission and frequency regulating circuit is used for being connected with a frequency setting pin of a control chip of the controlled switching power supply;
the current detection amplifying circuit comprises resistors R7-R9, an operational amplifier U2B and capacitors C2-C4; the reference comparison circuit comprises resistors R4-R6, an operational amplifier U2A and a capacitor C1; the isolation transmission and frequency regulation circuit comprises resistors R1-R3 and a triode Q1; wherein:
the current detection end C, D of the current detection amplifying circuit is connected with an input-stage current detection circuit of the controlled switching power supply, and the output control end A, B of the isolation transmission and frequency regulation circuit is connected with a frequency setting pin of a control chip of the controlled switching power supply;
the collector of the triode Q1 is connected with one end of the resistor R1; the other end of the resistor R1 is connected with an output control end A; an emitting electrode of the triode Q1 is connected with the ground end and the output control end B; the base electrode of the triode Q1 is connected with one end of the resistor R2 and one end of the resistor R3; the other end of the resistor R2 is grounded; the other end of the resistor R3 is connected with a pin 1 at the output end of the operational amplifier U2A;
the pin 2 of the negative input end of the operational amplifier U2A is connected with one end of a resistor R4 and one end of a resistor R5; the positive input end 3 pins of the operational amplifier U2A is connected with one end of a resistor R6; the other end of the resistor R5 is grounded;
the 8 pins of the power end of the operational amplifier U2A are connected with a reference power supply Vref, one end of a capacitor C1 and the other end of a resistor R4; the other end of the capacitor C1 is grounded;
the 4 pin of the grounding end of the operational amplifier U2A is grounded;
the pin 7 of the output end of the operational amplifier U2B is connected with the other end of the R6, one end of the capacitor C2 and one end of the capacitor C3; the other end of the capacitor C2 is connected with one end of a resistor R7;
a pin 6 at the negative input end of the operational amplifier U2B is connected with one end of a resistor R8, the other end of a resistor R7 and the other end of a capacitor C3; the other end of the resistor R8 is connected with a current detection end D and is grounded together;
the 5-pin end of the positive input end of the operational amplifier U2B is connected with one end of a resistor R9; the other end of the resistor R9 is connected with one end of the capacitor C4 and the current detection end C; the other end of the capacitor C4 is grounded.
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| CN202210877396.2A CN114944763B (en) | 2022-07-25 | 2022-07-25 | Switching power supply frequency regulating circuit |
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