CN114759798A - High-efficiency DC-DC switching power supply - Google Patents

High-efficiency DC-DC switching power supply Download PDF

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Publication number
CN114759798A
CN114759798A CN202210492022.9A CN202210492022A CN114759798A CN 114759798 A CN114759798 A CN 114759798A CN 202210492022 A CN202210492022 A CN 202210492022A CN 114759798 A CN114759798 A CN 114759798A
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China
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resistor
capacitor
circuit
power supply
output
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CN202210492022.9A
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Chinese (zh)
Inventor
邓宏
李星宇
罗明智
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Priority to CN202210492022.9A priority Critical patent/CN114759798A/en
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • 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
    • H02M1/36—Means for starting or stopping converters

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

Abstract

The invention aims to provide a high-frequency high-efficiency DC-DC switching power supply, belonging to the technical field of electronics. The switching power supply comprises a direct current power supply input circuit, a pulse width modulation circuit, a high-frequency voltage transformation circuit, a feedback circuit and a direct current power supply output circuit. The controller controls the conduction time or frequency of the switching tube through the pulse width modulation circuit, so as to control the output voltage; meanwhile, a corresponding switch tube discharge circuit is designed, and the soft start function of the controller is combined, so that the voltage of the switch tube is reduced to zero before the switch tube is switched on, and the current is reduced to zero before the switch tube is switched off, thereby reducing the loss of the switch tube; the DC power supply output circuit is reasonably designed, the filter circuit is designed, and the radiating fins are placed, so that the overall efficiency of the switching voltage is improved. In addition, the switching power supply has the functions of overvoltage protection, overheating protection and over-temperature protection at the same time, and is good in safety performance. The power of the switching power supply reaches 360W, and the efficiency can reach 95 percent.

Description

High-efficiency DC-DC switching power supply
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a high-efficiency DC-DC switching power supply.
Background
With the development of power electronic technology and the development of switching devices, the switching power supply has been widely applied in power supply technology due to its small size, high efficiency and high reliability. To reduce power consumption, high efficiency has been an important research direction for switching power supplies; the household appliances usually use a hectowatt-level switching power supply, but most of the switching power supplies only have the efficiency of about 90%, so the research importance of the efficiency of the switching power supplies is particularly remarkable. Meanwhile, high frequency is also the main development direction of the switching power supply.
Disclosure of Invention
In view of the problems of the background art, the present invention is directed to a high efficiency DC-DC switching power supply. The switching power supply comprises a direct-current power supply input circuit, a pulse width modulation circuit, a high-frequency voltage transformation circuit, a feedback circuit and a direct-current power supply output circuit, and the power supply efficiency is improved by reasonably designing a circuit structure to reduce the power supply energy consumption.
In order to realize the purpose, the technical scheme of the invention is as follows:
a high-efficiency DC-DC switching power supply comprises a DC power supply input circuit, a pulse width modulation circuit, a high-frequency voltage transformation circuit, a feedback circuit and a DC power supply output circuit;
the direct-current power supply input circuit is used for providing circuit protection and input voltage; the pulse width modulation circuit is used for adjusting the duty ratio of the switching tube and determining the value of the output voltage; the high-frequency transformer circuit is used for providing alternating-current voltage for the direct-current power supply output circuit; the direct current power supply output circuit is used for providing target output voltage and current; the feedback circuit is used for feeding back the output voltage to the pulse width modulation circuit, so that the duty ratio of the switching tube is adjusted, and the stability of the output voltage is ensured.
The direct-current power supply input circuit is connected with the input end of the pulse width modulation circuit and the output end of the high-frequency transformer circuit; the output end of the pulse width modulation circuit is connected with the input end of the high-frequency transformer circuit; the output end of the direct current power supply output circuit is connected with the input end of the feedback circuit; the output end of the feedback circuit is connected with the input end of the pulse width modulation circuit.
Further, the direct current power input circuit comprises an input port H1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8; one end of the input port H1 is connected to one end of the first resistor R1 and one end of the second resistor R2; the other end of the input port H1 is connected with the other end of the first resistor R1 and is connected with the ground GND; the other end of the second resistor R2 is connected with one end of a third resistor R3 and one end of a seventh resistor R7; the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are sequentially connected in series, and the other end of the sixth resistor R6 is connected with the input ground GND; the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8.
Further, the first resistor R1 is a voltage dependent resistor, and the second resistor R2 is a thermistor.
Further, the pulse width modulation circuit includes a controller U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a ninth resistor R9, a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6, a third diode D3, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first switch tube Q1, and a seventh capacitor C7; a first end of the controller U1 is connected to one end of a second capacitor C2, a second end of the controller U1 is connected to one end of a sixth resistor R6, a third end of the controller U1 is connected to one end of a first capacitor C1 and one end of a thirteenth resistor R13, a fourth end of the controller U1 is connected to one end of a ninth resistor R9, a fifth end of the controller U1 is connected to the input ground GND, a sixth end of the controller U8938 is connected to one end of a twelfth resistor R12, a seventh end of the controller U1 is connected to the other end of an eighth resistor R8, one end of a fourth capacitor C4 and one end of an eleventh resistor R11, and an eighth end of the controller U8928 is connected to one end of a third capacitor C3; the other end of the thirteenth resistor R13 is connected to one end of the fifteenth resistor R15, the source of the first switching tube Q1, one end of the seventh capacitor C7 and one end of the sixteenth resistor R16; the drain of the first switching tube Q1 is connected to the other end of the seventh capacitor C7, and the gate of the first switching tube Q1 is connected to the other end of the fifteenth resistor R15, one end of the fourteenth resistor R14 and the anode of the third diode D3; the other end of the fourteenth resistor R14 is connected to the cathode of the third diode D3, one end of the sixth capacitor C6 and the other end of the twelfth resistor R12; the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the ninth resistor R9, the other end of the sixteenth resistor R16 and the other end of the sixth capacitor C6 are all connected to the input ground GND.
Further, the preferred novel high frequency PWM controller of controller U1, its highest operating frequency can reach 500KHz, and its first end is feedback pin, and the second end is input voltage control pin, and the third end is current control pin, and the fourth end is switching frequency control pin, and the fifth end is the controller lower margin, and the sixth end is grid output pin, and the seventh end is the mains voltage pin, and the eighth end is soft start pin.
Further, the high frequency transformer circuit includes a high frequency transformer U2, a tenth resistor R10, a fourth capacitor C4, a fifth capacitor C5, a first diode D1, a second diode D2, and an eleventh resistor R11; a first end of the high-frequency transformer U2 is connected with the other end of the second resistor, one end of the tenth resistor R10 and one end of the fifth capacitor C5, a second end of the high-frequency transformer U2 is connected with the anode of the second diode D2 and the drain of the first switching tube Q1, a third end of the high-frequency transformer U2 is connected with the anode of the first diode D1, a fourth end of the high-frequency transformer U2 is connected with the ground GND, and a fifth end and a sixth end of the high-frequency transformer U2 are connected with the DC power supply output circuit; the cathode of the first diode D1 is connected to one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to one end of a fourth capacitor C4; the cathode of the second diode D2 is connected to the other end of the tenth resistor R10 and the other end of the fifth capacitor C5; the other terminal of the fourth capacitor C4 is connected to ground.
Further, the high-frequency transformer U2 is preferably a forward high-frequency transformer having two port portions on the primary side, wherein the first port portion includes a first end and a second end, and the second port portion includes a third end and a fourth end; the secondary side has a port section consisting of a fifth end and a sixth end.
Further, the direct current power output circuit comprises an output port H2, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor R24, a ninth capacitor C9, a tenth capacitor C10, a twelfth electrolytic capacitor C12, a thirteenth electrolytic capacitor C13, a fourteenth capacitor C14, a fourth diode D4, a fifth diode D5 and a first inductor L1; a cathode of the fourth diode D4 is connected to one end of the eighteenth resistor R18 and the sixth end of the high-frequency transformer U2, an anode of the fourth diode D4 is connected to one end of the tenth capacitor C10, an anode of the fifth diode D5, a cathode of the twelfth capacitor C12, a cathode of the thirteenth capacitor C13, one end of the fourteenth capacitor C14, one end of the twenty-fourth capacitor R24, and the low-potential output end 2 of the output port H2; the other end of the tenth capacitor C10 is connected with one end of a nineteenth capacitor R19; the other end of the nineteenth capacitor R19 is connected to the fifth terminal of the high-frequency transformer U2, the cathode of the fifth diode D5 and one end of the first inductor L1; the other end of the first inductor L1 is connected to the anode of the twelfth capacitor C12, the anode of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14, the other end of the twenty-fourth capacitor R24, and the high-potential output end 1 of the output port H2; one end of the twelfth capacitor C12 is connected to the output ground GNDD.
Further, in the switching power supply packaging process, heat sinks may be disposed near the sixth diode D4 and the seventh diode D5.
Further, the feedback circuit comprises an optocoupler U3, a voltage regulator U4, a seventeenth resistor R17, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, an eighth capacitor C8 and an eleventh capacitor C11; the first end of the optical coupler U3 is connected with one end of a seventeenth resistor R17 and one end of a twentieth resistor R20, the second end of the optical coupler U3 is connected with the other end of a seventeenth resistor R17 and one end of a twenty-first resistor R21, and the cathode of a voltage regulator tube U4, the third end of the optical coupler U3 is connected with an input ground GND, and the fourth end of the optical coupler U3 is connected with the first end of a controller U1 in the pulse width modulation circuit; the other end of the twentieth resistor R20 is connected with one end of the twenty-second resistor R22 and the other end of the first inductor L1 in the direct-current power supply output circuit; the other end of the twenty-second resistor R22 is connected with one end of an eleventh capacitor C11, a reference electrode of a voltage regulator tube U4 and one end of a twenty-third resistor R23; the anode of the voltage regulator tube U4 is connected with one end of an eighth capacitor C8 and the output ground GNDD; the other end of the eighth capacitor C8 is connected with the fourth end of the high-frequency transformer U2 in the high-frequency transformer circuit; the other end of the twenty-third resistor R23.
Further, the optocoupler is a PC817S optocoupler, and the regulator tube U4 is preferably an LTL431 regulator tube.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention adopts a high-frequency high-efficiency DC-DC switching power supply, and the conduction time or frequency of a switching tube is controlled by a controller in a pulse width modulation circuit, so that the output voltage is controlled; meanwhile, a corresponding switch tube discharge circuit is designed, and the soft start function of the controller is combined, so that the voltage of the switch tube is reduced to zero before the switch tube is switched on, and the current is reduced to zero before the switch tube is switched off, thereby reducing the loss of the switch tube; the DC power supply output circuit is reasonably designed, the filter circuit is designed, and the radiating fins are placed, so that the overall efficiency of the switching voltage is improved. In addition, the switching power supply has the functions of overvoltage, overheating and overtemperature protection at the same time, and has good safety performance. The frequency of the switching power supply reaches 500kHz, and the efficiency can reach 95%.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the DC-DC switching power supply of the present invention.
Fig. 2 is a schematic circuit diagram of the DC-DC switching power supply of the present invention.
Fig. 3 is a pin diagram of the PWM controller U1 in the DC-DC switching power supply of the present invention.
Fig. 4 is a schematic diagram of a pin of a high-frequency transformer in the DC-DC switching power supply of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings.
A high-efficiency DC-DC switching power supply is disclosed, the overall structure diagram of which is shown in figure 1, and comprises a DC power supply input circuit, a pulse width modulation circuit, a high-frequency voltage transformation circuit, a feedback circuit and a DC power supply output circuit;
the direct-current power supply input circuit is used for providing circuit protection and input voltage; the pulse width modulation circuit is used for adjusting the duty ratio of the switching tube and determining the value of the output voltage; the high-frequency transformer circuit is used for providing alternating-current voltage for the direct-current power supply output circuit; the direct current power supply output circuit is used for providing target output voltage and current; the feedback circuit is used for feeding back the output voltage to the pulse width modulation circuit, so that the duty ratio of the switching tube is adjusted, and the stability of the output voltage is ensured.
The direct-current power supply input circuit is connected with the input end of the pulse width modulation circuit and the output end of the high-frequency transformer circuit; the output end of the pulse width modulation circuit is connected with the input end of the high-frequency transformer circuit; the output end of the direct current power supply output circuit is connected with the input end of the feedback circuit; the output end of the feedback circuit is connected with the input end of the pulse width modulation circuit.
Example 1
The circuit structure diagram of the DC-DC switching power supply provided by the present embodiment is shown in fig. 2; the direct current power supply input end comprises H1, R1, R2, R3, R4, R5, R6, R7 and R8; the pulse width modulation circuit comprises U1, C1, C2, C3, R9, R12, R13, C6, D3, R14, R15, R16, Q1 and C7; the high-frequency transformer circuit comprises U2, R10, C5, D2, C4, R11 and D1; the direct-current power supply output circuit comprises R18, C9, D4, R19, C10, D5, L1, C12, C13, C14, R24 and H2; the feedback circuit comprises R20, R17, U3, R22, R23, C11, U4, C8 and R21.
A novel high-frequency PWM controller U1 is adopted in the pulse width modulation circuit, the model is NCP1252, and the highest working frequency can reach 500 KHz. A first pin of the high-frequency PWM controller chip is a feedback pin and is directly connected to a fourth pin of a PC817S optocoupler, and under the condition of normal work, the on-off state of a switch tube Q1 is controlled by the pins, so that a reasonable duty ratio is designed; the second pin is an input voltage monitoring pin, and the chip starts to work when the input voltage is in a normal range; a third pin is a current monitoring pin and is used for monitoring a main current and allowing the slope compensation amplitude to be selected; the fourth pin is a switching frequency control pin, and the grounded resistor can set the switching frequency of the system; the pin five is a controller anchor and is connected with an input ground; a pin six is a grid output pin, and the pin six of the output circuit of the PWM controller is connected to the grid of the switching tube through a mos charging and discharging circuit designed by R12, R14 and D3 to provide grid voltage; the seventh pin is a power supply voltage pin, so that 8V to 28V voltage is provided for the system, and the chip works normally; pin eight is a soft-start pin that selects the soft-start duration for a capacitor connected to ground;
the pin diagram of the high frequency PWM controller U1 is shown in fig. 3. A pin I (FB) of the PWM controller U1 is connected with the input ground through a capacitor C2 and is connected with a pin IV of a PC817S optocoupler; a pin two (BO) of a PWM controller U1 is connected to a high potential end of a divider resistor R6, and the resistor R6 is connected with a pin one of a thermistor R2 through resistors R5, R4 and R3; a pin three (CS) of a PWM controller U1 is connected with the input ground through a capacitor C1 and is connected to a source electrode of a switching tube Q1 through a resistor R13, a drain electrode of the switching tube Q1 is connected to a pin two of the high-frequency transformer, a source electrode is connected with the input ground through a resistor R16, and the drain electrode and the source electrode are in short circuit through the capacitor C7; the four (RT) pins of the U1 of the PWM controller are connected with the input ground through a resistor R9; pin five (GND) of the PWM controller U1 is connected with the input ground; a six-pin (DRV) of a U1 pin of the PWM controller is connected in series to the grid electrode of a switching tube Q1 through resistors R12 and R14, a diode D3 and R14 are connected in parallel in an opposite direction, the cathode of the D3 is connected with the input ground through a capacitor C6, the anode of the D3 is connected to the grid electrode of the Q1, and the input ground is connected through resistors R15 and R16; a pin seven (VCC) of the PWM controller U1 is connected to the 1 end of a thermistor R2 through R8 and R7, is connected to the input ground through a capacitor C4, and is connected to a pin three of the high-frequency transformer through a resistor R11 and a diode D1; the eight (SS) pin of the PWM controller U1 is coupled to ground through a capacitor C3.
Since the high frequency PWM controller U1 uses an internal fixed timer, output overload can be detected by independent auxiliary VCC; meanwhile, the BO monitors the input voltage, so that system overload caused by excessively low input voltage can be prevented, and the safety of the converter is improved. Finally, the SOIC-8 package saves PCB space.
The high-frequency transformer U2 in the high-frequency transformer circuit adopts a forward high-frequency transformer, the primary side of the forward high-frequency transformer has two ports respectively composed of pins 1, 2 and 3, 4, and the secondary side of the forward high-frequency transformer has one port composed of pins 5, 6, and the structural schematic diagram is shown in fig. 4. A clamping circuit is arranged between the first pin and the second pin, the clamping circuit has the functions of fixing voltage and absorbing the peak voltage of the transformer, and meanwhile, the second pin is connected with the drain electrode of the switching tube to provide the drain electrode voltage for the switching tube; pins three and four provide reasonable input voltage for the chip (PWM controller U1); pins five and six provide input voltage for the direct current power supply output circuit.
A pin I of the high-frequency transformer is connected to a pin I of a thermistor R2; a second high-frequency transformer pin is connected with a first thermistor R2 pin through a diode D2 and a resistor R10, and is connected with the first high-frequency transformer pin through a diode D2 and a capacitor C5; the high-frequency transformer pin III is connected to the input ground GND through a diode D1, a resistor R11 and a capacitor C4; the pin four of the high-frequency transformer is connected with the input ground; and a pin five and a pin six of the high-frequency transformer are connected with the input end of the direct-current power supply output circuit, the pin five is connected to the upper end of the resistor R19, and the pin six is connected to the cathode of the diode D4.
A resistor R19, a diode D5, a capacitor C12, a capacitor C13, a capacitor C14 and a resistor R24 in the direct-current power supply output circuit are connected in parallel; the resistor R19 is connected with the anode of the diode D4 through the capacitor C10; the cathode of the diode D5 is connected with the anode of the capacitor C12 through the inductor L1, and the anode of the diode D4 is connected; the negative electrode of the capacitor C12 is connected with the output ground; the voltage at the two ends of the resistor R24 is output voltage; a heat sink is placed near diodes D4 and D5. Meanwhile, the direct-current power supply output circuit is a BUCK voltage reduction type circuit, R19 and C10 are RC filters, first filtering is carried out, C12, C13 and C14 sequentially filter the remaining low-frequency and high-frequency parts, and finally the remaining direct-current part is output. Wherein, C12 and C13 are electrolytic capacitors, and the larger the capacitance value is, the better the low-frequency filtering effect is; c14 is used for high frequency filtering.
An optocoupler U3 in the feedback circuit adopts PC817S, a first optocoupler pin of the PC817S is connected with a high-potential end of an output end through a resistor R20, and is connected with a second optocoupler pin of the PC817S through a resistor R17; the resistor R20 is connected with the output low through a resistor R22 and a resistor R23; the resistor R22 is connected with the cathode of a voltage regulator LTL431 through a capacitor C11, a resistor R21 and a capacitor LTL 11; the cathode of the voltage-stabilizing tube TL431 is connected with a second optical coupling pin of PC817S, the anode is connected with the output ground, the anode is connected with a fourth pin of the high-frequency transformer through a capacitor C8, and the reference electrode is connected with the output ground through R23; the PC817S optical coupling pin is three-connected to the output ground.
The PC817S opto-coupler and the voltage regulator TL431 are combined to form a feedback circuit, the feedback circuit is connected to a first pin of the PWM controller chip through a fourth pin, and the duty ratio is adjusted through the magnitude of the feedback current.
In the DC-DC switching power supply of the present embodiment, the DC voltage input at the DC power supply input terminal is DC100-200V, the maximum duty ratio set by the PWM controller chip is 80%, and the turn ratio of the primary side and the secondary side of the high-frequency transformer is 2.5: 1. When the high-frequency transformer works, the voltage of the input end of the high-frequency transformer is DC100-200V, the voltage of the output of a power supply is 24V, the current is 15A, the power is 360W, and the efficiency is 95%.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.

Claims (10)

1. A high-efficiency DC-DC switching power supply is characterized by comprising a DC power supply input circuit, a pulse width modulation circuit, a high-frequency voltage transformation circuit, a feedback circuit and a DC power supply output circuit;
the direct-current power supply input circuit is used for providing circuit protection and input voltage; the pulse width modulation circuit is used for adjusting the duty ratio of the switching tube and determining the value of the output voltage; the high-frequency transformer circuit is used for providing alternating-current voltage for the direct-current power supply output circuit; the direct current power supply output circuit is used for providing target output voltage and current; the feedback circuit is used for feeding back the output voltage to the pulse width modulation circuit, so that the duty ratio of the switching tube is adjusted, and the stability of the output voltage is ensured.
The direct-current power supply input circuit is connected with the input end of the pulse width modulation circuit and the output end of the high-frequency transformer circuit; the output end of the pulse width modulation circuit is connected with the input end of the high-frequency transformer circuit; the output end of the direct current power supply output circuit is connected with the input end of the feedback circuit; the output end of the feedback circuit is connected with the input end of the pulse width modulation circuit.
2. The high efficiency DC-DC switching power supply according to claim 1, wherein the DC power input circuit includes an input port H1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; one end of the input port H1 is connected to one end of the first resistor R1 and one end of the second resistor R2; the other end of the input port H1 is connected with the other end of the first resistor R1 and is connected with the ground GND; the other end of the second resistor R2 is connected with one end of a third resistor R3 and one end of a seventh resistor R7; the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are sequentially connected in series, and the other end of the sixth resistor R6 is connected with the input ground GND; the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8.
3. The high efficiency DC-DC switching power supply according to claim 2, wherein the first resistor R1 is a voltage dependent resistor and the second resistor R2 is a thermistor.
4. The high efficiency DC-DC switching power supply of claim 1, wherein said pulse width modulation circuit comprises a controller U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a ninth resistor R9, a twelfth resistor R12, a thirteenth resistor R13, a sixth capacitor C6, a third diode D3, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a first switching tube Q1, a seventh capacitor C7; the first end of the controller U1 is connected to one end of the second capacitor C2, the second end is connected to one end of the sixth resistor R6, the third end is connected to one end of the first capacitor C1 and one end of the thirteenth resistor R13, the fourth end is connected to one end of the ninth resistor R9, the fifth end is connected to the input ground GND, the sixth end is connected to one end of the twelfth resistor R12, the seventh end is connected to the other end of the eighth resistor R8, one end of the fourth capacitor C4 and one end of the eleventh resistor R11, and the eighth end is connected to one end of the third capacitor C3; the other end of the thirteenth resistor R13 is connected to one end of the fifteenth resistor R15, the source of the first switching tube Q1, one end of the seventh capacitor C7 and one end of the sixteenth resistor R16; the drain of the first switching tube Q1 is connected to the other end of the seventh capacitor C7, and the gate of the first switching tube Q1 is connected to the other end of the fifteenth resistor R15, one end of the fourteenth resistor R14 and the anode of the third diode D3; the other end of the fourteenth resistor R14 is connected to the cathode of the third diode D3, one end of the sixth capacitor C6 and the other end of the twelfth resistor R12; the other end of the first capacitor C1, the other end of the second capacitor C2, the other end of the third capacitor C3, the other end of the ninth resistor R9, the other end of the sixteenth resistor R16 and the other end of the sixth capacitor C6 are all connected to the input ground GND.
5. The high efficiency DC-DC switching power supply according to claim 4, wherein the controller U1 is preferably a new high frequency PWM controller with a maximum operating frequency up to 500KHz, a first terminal being a feedback pin, a second terminal being an input voltage monitoring pin, a third terminal being a current monitoring pin, a fourth terminal being a switching frequency control pin, a fifth terminal being a controller ground pin, a sixth terminal being a gate output pin, a seventh terminal being a supply voltage pin, and an eighth terminal being a soft start pin.
6. The high efficiency DC-DC switching power supply according to claim 1, wherein the high frequency transformer circuit includes a high frequency transformer U2, a tenth resistor R10, a fourth capacitor C4, a fifth capacitor C5, a first diode D1, a second diode D2, and an eleventh resistor R11; a first end of the high-frequency transformer U2 is connected with the other end of the second resistor, one end of the tenth resistor R10 and one end of the fifth capacitor C5, a second end of the high-frequency transformer U2 is connected with the anode of the second diode D2 and the drain of the first switching tube Q1, a third end of the high-frequency transformer U2 is connected with the anode of the first diode D1, a fourth end of the high-frequency transformer U2 is connected with the ground GND, and a fifth end and a sixth end of the high-frequency transformer U2 are connected with the DC power supply output circuit; the cathode of the first diode D1 is connected to one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to one end of a fourth capacitor C4; the cathode of the second diode D2 is connected to the other end of the tenth resistor R10 and the other end of the fifth capacitor C5; the other terminal of the fourth capacitor C4 is connected to ground.
7. The high efficiency DC-DC switching power supply according to claim 6, wherein the high frequency transformer U2 is preferably a forward high frequency transformer having two ports on the primary side, wherein the first port comprises a first terminal and a second terminal, and the second port comprises a third terminal and a fourth terminal; the secondary side has a port section consisting of a fifth end and a sixth end.
8. The high efficiency DC-DC switching power supply according to claim 1, wherein the DC power output circuit includes an output port H2, an eighteenth resistor R18, a nineteenth resistor R19, a twenty-fourth resistor R24, a ninth capacitor C9, a tenth capacitor C10, a twelfth electrolytic capacitor C12, a thirteenth electrolytic capacitor C13, a fourteenth capacitor C14, a fourth diode D4, a fifth diode D5, and a first inductor L1; a cathode of the fourth diode D4 is connected to one end of the eighteenth resistor R18 and the sixth end of the high-frequency transformer U2, an anode of the fourth diode D4 is connected to one end of the tenth capacitor C10, an anode of the fifth diode D5, a cathode of the twelfth capacitor C12, a cathode of the thirteenth capacitor C13, one end of the fourteenth capacitor C14, one end of the twenty-fourth capacitor R24, and the low-potential output end 2 of the output port H2; the other end of the tenth capacitor C10 is connected with one end of a nineteenth capacitor R19; the other end of the nineteenth capacitor R19 is connected to the fifth terminal of the high-frequency transformer U2, the cathode of the fifth diode D5 and one end of the first inductor L1; the other end of the first inductor L1 is connected to the anode of the twelfth capacitor C12, the anode of the thirteenth capacitor C13, the other end of the fourteenth capacitor C14, the other end of the twenty-fourth capacitor R24, and the high-potential output end 1 of the output port H2; one end of the twelfth capacitor C12 is connected to the output ground GNDD.
9. The high efficiency DC-DC switching power supply according to claim 1, wherein the feedback circuit comprises an optocoupler U3, a regulator U4, a seventeenth resistor R17, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, an eighth capacitor C8, and an eleventh capacitor C11; the first end of the optical coupler U3 is connected with one end of a seventeenth resistor R17 and one end of a twentieth resistor R20, the second end of the optical coupler U3 is connected with the other end of a seventeenth resistor R17 and one end of a twenty-first resistor R21, and the cathode of a voltage regulator tube U4, the third end of the optical coupler U3 is connected with an input ground GND, and the fourth end of the optical coupler U3 is connected with the first end of a controller U1 in the pulse width modulation circuit; the other end of the twentieth resistor R20 is connected with one end of the twenty-second resistor R22 and the other end of the first inductor L1 in the direct-current power supply output circuit; the other end of the twenty-second resistor R22 is connected with one end of an eleventh capacitor C11, a reference electrode of a voltage regulator tube U4 and one end of a twenty-third resistor R23; the anode of the voltage regulator tube U4 is connected with one end of an eighth capacitor C8 and the output ground GNDD; the other end of the eighth capacitor C8 is connected with the fourth end of the high-frequency transformer U2 in the high-frequency transformer circuit; the other end of the twenty-third resistor R23.
10. The high efficiency DC-DC switching power supply of claim 9 wherein said optocoupler is a PC817S optocoupler and wherein the regulator U4 is an LTL431 regulator.
CN202210492022.9A 2022-05-07 2022-05-07 High-efficiency DC-DC switching power supply Pending CN114759798A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109474184A (en) * 2018-12-19 2019-03-15 佛山市南海区昭裕照明有限公司 A kind of high power constant compresses switch power supply
CN109510482A (en) * 2018-12-19 2019-03-22 佛山市南海区昭裕照明有限公司 A kind of Switching Power Supply of stable output
CN212163794U (en) * 2020-04-29 2020-12-15 佛山市南海区昭裕照明有限公司 High-power linear dimming power supply

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109474184A (en) * 2018-12-19 2019-03-15 佛山市南海区昭裕照明有限公司 A kind of high power constant compresses switch power supply
CN109510482A (en) * 2018-12-19 2019-03-22 佛山市南海区昭裕照明有限公司 A kind of Switching Power Supply of stable output
CN212163794U (en) * 2020-04-29 2020-12-15 佛山市南海区昭裕照明有限公司 High-power linear dimming power supply

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