CN115483827A - Isolated DC-DC power supply circuit based on non-isolated DC-DC converter - Google Patents

Isolated DC-DC power supply circuit based on non-isolated DC-DC converter Download PDF

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Publication number
CN115483827A
CN115483827A CN202210832349.6A CN202210832349A CN115483827A CN 115483827 A CN115483827 A CN 115483827A CN 202210832349 A CN202210832349 A CN 202210832349A CN 115483827 A CN115483827 A CN 115483827A
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China
Prior art keywords
isolated
power supply
circuit
rectifying
converter
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Pending
Application number
CN202210832349.6A
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Chinese (zh)
Inventor
郭一粟
李安裕
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Xiamen Lintai Micro Technology Co ltd
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Xiamen Lintai Micro Technology Co ltd
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Priority to CN202210832349.6A priority Critical patent/CN115483827A/en
Publication of CN115483827A publication Critical patent/CN115483827A/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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
    • 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
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • 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
    • 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
    • H02M3/33561—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 having more than one ouput with independent control
    • 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
    • H02M3/33569—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 having several active switching elements

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

Abstract

The invention discloses an isolated DC-DC power supply circuit based on a non-isolated DC-DC converter, which comprises a non-isolated DC-DC converter, a first resistor, a second resistor, a first capacitor, a second capacitor, an isolation transformer and a rectifying and filtering circuit, wherein the first resistor is connected with the first resistor; the non-isolated DC-DC converter comprises a power supply input pin, a switch output pin, a feedback input pin and a grounding pin; the second resistor is bridged between the feedback input pin and the grounding pin; an input winding of the isolation transformer is bridged between a switch output pin and a first node, the first node is connected with a feedback input pin through a first resistor, is connected with a first reference ground through a first capacitor, and is connected with a power supply input pin through a second capacitor; the isolation transformer comprises one or more groups of output windings, and each group of output windings is respectively connected with one group of rectifying and filtering circuits. When the isolated DC-DC converter is expensive, the circuit adopts the non-isolated DC-DC converter to carry out peripheral circuit transformation to realize the function of isolating the power supply, and can effectively reduce the circuit cost.

Description

Isolated DC-DC power supply circuit based on non-isolated DC-DC converter
Technical Field
The invention relates to the field of DC-DC converters, in particular to an isolation type DC-DC power supply circuit based on a non-isolation DC-DC converter.
Background
The traditional three-phase power inverter circuit and the high-power bidirectional DC-DC conversion circuit need to use a large amount of isolation power supplies for supplying power to an isolation drive, and the traditional mode adopts either main control chip control or a special isolation type DC-DC converter, such as SN6501 of American TI. The use of the main control chip has the advantages of cost saving and brings about the problems that the PCB wiring is difficult and the interference problem exists; the use of the isolated power management chip has the problems of low localization and high cost. For the above reasons, it is desirable to implement the function of isolating the power supply by modifying the peripheral circuit with a domestic non-isolated DC-DC converter, so as to reduce the circuit cost.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an isolated DC-DC power supply circuit based on a low-cost non-isolated DC-DC converter, so as to improve the localization rate and reduce the circuit cost.
In order to achieve the above object, the present invention provides an isolated DC-DC power supply circuit based on a non-isolated DC-DC converter, which includes a non-isolated DC-DC converter, a first resistor, a second resistor, a first capacitor, a second capacitor, an isolation transformer, and a rectification filter circuit;
the non-isolated DC-DC converter comprises a power supply input pin, a switch output pin, a feedback input pin and a grounding pin; the second resistor is connected between the feedback input pin and the grounding pin in a bridging mode;
the power supply input pin is used for connecting the anode of an input direct current;
the input winding of the isolation transformer is bridged between the switch output pin and a first node, the first node is connected with the feedback input pin through the first resistor, is connected with a first reference ground through the first capacitor, and is connected with the power supply input pin through the second capacitor;
the ground pin and the first reference ground are connected;
the isolation transformer comprises one or more groups of output windings, and each group of output windings is respectively connected with one group of rectifying and filtering circuits.
Further, the non-isolated DC-DC converter is a synchronous buck DC-DC converter, and the working mode is FCCM.
Further, the non-isolated DC-DC converter further includes a boost pin, and the boost pin is connected to the switch output pin through a third capacitor.
Furthermore, a fourth capacitor is connected in parallel to the first resistor, and the fourth capacitor is a high-frequency capacitor.
Further, the rectification filter circuit comprises a half-wave rectification filter circuit, a full-wave rectification filter circuit and a bridge rectification filter circuit.
Further, the isolated DC-DC power supply circuit further comprises a negative voltage bias circuit, the negative voltage bias circuit comprises a resistor and a voltage-regulator tube, the rectifying and filtering circuit is a bridge-type rectifying and filtering circuit or a full-wave rectifying and filtering circuit, a positive output end of the bridge-type rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected to a negative output end of the bridge-type rectifying and filtering circuit or the full-wave rectifying and filtering circuit through the resistor and the voltage-regulator tube, a second node connected with the resistor and the voltage-regulator tube is connected with a second reference ground, a negative output end of the bridge-type rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected with a negative electrode of a negative power supply, a positive output end of the bridge-type rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected with a positive electrode of a positive power supply, and the second reference ground is connected with a positive electrode of the negative power supply and a negative electrode of the positive power supply.
The invention realizes the following technical effects:
when the isolated DC-DC converter is expensive, the isolated DC-DC power supply circuit provided by the invention realizes the function of isolating the power supply by adopting the non-isolated DC-DC converter to carry out peripheral circuit transformation, so that the circuit cost can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of an isolated DC-DC power supply circuit in accordance with a preferred embodiment;
FIG. 2 is a typical circuit diagram of a non-isolated DC-DC converter employed in the present invention;
FIG. 3 is a simplified circuit diagram of the isolated DC-DC power supply circuit of the present invention;
fig. 4 is a waveform diagram of test point LX of the circuit of fig. 3.
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures.
The invention will now be further described with reference to the drawings and the detailed description.
Example 1
The invention provides an isolated DC-DC power supply circuit based on a non-isolated DC-DC converter, which is shown in figure 1. In this embodiment, the non-isolated DC-DC converter employs SM8102E, a typical circuit of which is shown in fig. 2. The non-isolated DC-DC converter SM8102E is a synchronous buck (buck type) DC-DC converter and comprises a power supply input pin VIN, an enable pin EN, a switch output pin LX and a feedback input pin FB, wherein a triangular wave signal output by the LX is filtered by an inductor L1 and a filter capacitor Cout and then outputs a direct current Vout, and meanwhile, a voltage division circuit consisting of the inductor L1, resistors RH and RL is used for inputting a feedback signal by the feedback input pin FB so as to control the voltage and ripple of the output direct current Vout. There are also many non-isolated DC-DC converters compatible with SM8102E, including: SY8891EARC/SY8002E1ABC/SY8089E1AAC/SY8892EARC/SY8201CABC/SY8502AFCC/SY8120E1ABC/SY8121B1ABC/SY8113B1ADC/SY8113E1ADC/SY81003EADC/SQ28053QWC/SQ28906QDC/SQ28956WEQ/SQ27000SXC/SQ27000FCC and the like.
As shown in fig. 1, an input end of the isolated DC-DC power supply circuit is composed of a non-isolated DC-DC converter SM8102E, an isolation transformer T1, resistors R1 and R3, capacitors C1, C2, C6, C7, and C9; the output end of the rectifier tube is composed of rectifier tubes D1, D2, D3, D4, D5, D6, D7 and D8, capacitors C3, C5, C8, C10, C12 and C13, resistors R2 and R6, voltage-stabilizing tubes D9 and D10 and the like. The output of the LX is directly connected with the input winding of the isolation transformer T1, and the output winding of the isolation transformer T1 is connected with the rectifying and filtering circuit to output direct current.
The resistor R1 is bridged between the feedback input pin FB and the ground GND; one end of the resistor R3 is connected with the feedback input pin FB, a node where the other end of the resistor R3 is located is connected with the first reference ground through a capacitor C7, connected with the input direct current VCC through a capacitor C9 and connected to the switch output pin LX through an input winding of the isolation transformer. In the original non-isolated DC-DC conversion application, the capacitors R1 and R3 respectively correspond to the resistors RL and RH to form a voltage division circuit so as to output a feedback voltage to the feedback input pin FB. In the present application, R1 and R3 are configured according to the power input voltage Vin, so that the DC-DC converter operates at a 50% duty ratio. Fig. 3 is a schematic diagram of simplified internal structure of the DC-DC converter, in which when the upper tube MOS1 of the DC-DC converter is turned on and the lower tube MOS2 is turned off, the isolation transformer T1 transfers energy in the positive direction, and when the upper tube MOS1 of the DC-DC converter is turned off and the lower tube MOS2 is turned on, the isolation transformer T1 transfers energy in the negative direction, and the isolation transformer T1 magnetic core can be reset in each working cycle by alternately transferring energy in the positive direction and the negative direction. With the above configuration, a voltage waveform at a detection point LX of the oscilloscope in fig. 3, specifically, fig. 4, can be obtained.
In this embodiment, the non-isolated DC-DC converter SM8102E includes a boost pin BS connected to the switch output pin LX through a capacitor C2.
In the embodiment, the isolation transformer T1 includes an input winding T1_1 and two output windings T1_2 and T1_3, in the output end of the filter rectification circuit, two sets of bridge rectification circuits consisting of D1, D2, D3, D4 and D5, D6, D7, D8, a reference ground is set and negative voltage bias is performed through R2, D9, R5, D10, and four sets of direct currents of Vout1+, vout1-, vout2+, vout 2-are output after passing through the filter capacitors C3, C5, C8, C10, C12, and C13. In other embodiments, the winding number and turns ratio settings of the input winding and the output winding of the isolation transformer T1 may be changed as desired, outputting one, two, or more sets of direct current, and allowing the output of a negative power supply.
In specific applications, the rectifying and filtering circuit may be a half-wave rectifying and filtering circuit (a group of rectifying and filtering circuits is formed by using one rectifying diode and one filtering capacitor in the circuit), a full-wave rectifying circuit (a group of rectifying and filtering circuits is formed by using two rectifying diodes and two filtering capacitors in the circuit), or a bridge rectifying circuit (a group of rectifying and filtering circuits is formed by using four rectifying diodes and four filtering capacitors in the circuit).
The invention has the technical effects that:
when the isolated DC-DC converter is expensive, the isolated DC-DC power supply circuit of the invention adopts the non-isolated DC-DC converter to carry out peripheral circuit transformation to realize the function of isolating the power supply, thereby effectively reducing the circuit cost.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. An isolated DC-DC power supply circuit based on a non-isolated DC-DC converter is characterized by comprising the non-isolated DC-DC converter, a first resistor, a second resistor, a first capacitor, a second capacitor, an isolation transformer and a rectifying and filtering circuit;
the non-isolated DC-DC converter comprises a power supply input pin, a switch output pin, a feedback input pin and a grounding pin; the second resistor is connected between the feedback input pin and the grounding pin in a bridging mode;
the power supply input pin is used for connecting the anode of the input direct current;
the input winding of the isolation transformer is bridged between the switch output pin and a first node, the first node is connected with the feedback input pin through the first resistor, is connected with a first reference ground through the first capacitor, and is connected with the power supply input pin through the second capacitor;
the ground pin and the first reference ground are connected;
the isolation transformer comprises one or more groups of output windings, and each group of output windings is respectively connected with one group of rectifying and filtering circuits.
2. The isolated DC-DC power supply circuit of claim 1 wherein the non-isolated DC-DC converter is a synchronous buck DC-DC converter and the mode of operation is FCCM.
3. The isolated DC-DC power supply circuit of claim 1 wherein the non-isolated DC-DC converter further comprises a boost pin connected to the switch output pin through a third capacitance.
4. The isolated DC-DC power supply circuit according to claim 1, wherein a fourth capacitor is connected in parallel with the first resistor, and the fourth capacitor is a high-frequency capacitor.
5. The isolated DC-DC power supply circuit of claim 1 wherein the rectifying-filtering circuit comprises a half-wave rectifying-filtering circuit, a full-wave rectifying-filtering circuit, and a bridge rectifying-filtering circuit.
6. The isolated DC-DC power supply circuit according to claim 5, further comprising a negative bias circuit, wherein the negative bias circuit comprises a resistor and a voltage regulator tube, the rectifying and filtering circuit is a bridge rectifying and filtering circuit or a full-wave rectifying and filtering circuit, a positive output end of the bridge rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected to a negative output end of the bridge rectifying and filtering circuit or the full-wave rectifying and filtering circuit through the resistor and the voltage regulator tube, a second node connected with the voltage regulator tube is connected with a second reference ground, a negative output end of the bridge rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected with a negative electrode of a negative power supply, a positive output end of the bridge rectifying and filtering circuit or the full-wave rectifying and filtering circuit is connected with a positive electrode of a positive power supply, and the second reference ground is connected with a positive electrode of the negative power supply and a negative electrode of the positive power supply.
CN202210832349.6A 2022-07-15 2022-07-15 Isolated DC-DC power supply circuit based on non-isolated DC-DC converter Pending CN115483827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210832349.6A CN115483827A (en) 2022-07-15 2022-07-15 Isolated DC-DC power supply circuit based on non-isolated DC-DC converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210832349.6A CN115483827A (en) 2022-07-15 2022-07-15 Isolated DC-DC power supply circuit based on non-isolated DC-DC converter

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CN115483827A true CN115483827A (en) 2022-12-16

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