CN112821773B - Double-power-supply-port isolated DC/DC converter - Google Patents

Double-power-supply-port isolated DC/DC converter Download PDF

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CN112821773B
CN112821773B CN202110116580.0A CN202110116580A CN112821773B CN 112821773 B CN112821773 B CN 112821773B CN 202110116580 A CN202110116580 A CN 202110116580A CN 112821773 B CN112821773 B CN 112821773B
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resonant
converter
channel
supply
transformer
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CN112821773A (en
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薛飞
王小立
张爽
田蓓
李宏强
马鑫
徐恒山
周雷
张迪
王超
杨慧彪
顾雨嘉
张汉花
吴玫蓉
梁剑
李峰
任勇
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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China Three Gorges University CTGU
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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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
    • H02M3/33561—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
    • H02M3/33507—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
    • H02M3/33523—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 galvanic isolation between input and output of both the power stage and the feedback loop
    • 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)

Abstract

The invention provides a double-power-supply-port isolated DC/DC converter, belonging to the technical field of power electronics. The method comprises the following steps: a first resonant channel and a second resonant channel, the first resonant channelThe passage being for a load R1Input supply voltage uo1The second resonant channel is used for providing a load R2Input supply voltage uo2(ii) a The first resonant channel is connected to an input power supply UinIncluding a fully-controlled switching device Q1Resonant inductor Lr1Resonant capacitor Cr1And an excitation inductor Lm1Transformer T1Diode D1Diode D2Filter capacitor Co1Load resistance R1(ii) a The second resonant channel is connected to an input power supply UinIncluding a fully-controlled switching device Q2Resonant inductor Lr2Resonant capacitor Cr2And an excitation inductor Lm2Transformer T2Diode D3Diode D4Filter capacitor Co2Load resistance R2。

Description

Double-power-supply-port isolated DC/DC converter
Technical Field
The invention relates to the technical field of power electronics, in particular to a double-power-supply-port isolated DC/DC converter.
Background
In a multi-load application scenario, a power supply needs to be configured for each load separately, but the scheme of separate power supply increases the hardware cost of the power supply. In the prior art, a flyback circuit is adopted to supply power to multiple loads, but the maximum power which can be processed by the flyback circuit is limited by a power device, so that the flyback circuit is not suitable for being applied to medium-high power occasions.
Disclosure of Invention
In view of this, the present invention provides a dual power supply port isolated DC/DC converter, which realizes dual port power supply with low cost, high efficiency and high power density.
The technical scheme adopted by the embodiment of the invention for solving the technical problem is as follows:
a dual supply port isolated DC/DC converter comprising: a first resonant channel and a second resonant channel, the first resonant channel is used as a load resistor R1Input supply voltage uo1The second resonant channel is used for being a load resistor R2Input supply voltage uo2；
The first resonant channel is connected to an input power supply UinIncluding a fully-controlled switching device Q1Resonant inductor Lr1Resonant capacitor Cr1And an excitation inductor Lm1Transformer T1Diode D1Diode D2Filter capacitor Co1Load resistance R1；
The second resonant channel is connected to an input power supply UinIncluding a fully-controlled switching device Q2Resonant inductor Lr2Resonant capacitor Cr2And an excitation inductor Lm2Transformer T2Diode D3Diode D4Filter capacitor Co2Load resistance R2；
Said Q1And said Q2In series, said Q1Is connected to an input power supply UinThe positive electrode of (1), the Q2Is connected to the UinThe negative electrode of (1), the T1One end of the primary winding is connected in series with the Lr1Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Cr1Post-connected to said Q1And said Q2Node b in between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node a, the T2The other end of the primary winding is connected in series with the Cr2Is then connected to the UinThe negative electrode of (1);
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (D)1And the cathode and the anode2Is connected to node b, the load resistor R1One end of which is connected to the node b and the other end of which is connected to the T1C, said Co1And said R1Parallel connection;
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3Anode of (a), said T2Is connected to said D4The anode of (D)3And the cathode and the anode4Is connected to node c, andthe load resistor R2One end of which is connected to the node c and the other end of which is connected to the T2C, said Co2And said R2Parallel connection;
said Lm1Is connected to the T1Between 2 primary windings of said Lm2Is connected to the T 22 primary windings.
Preferably, the working frequency of the first resonant channel is equal to the working frequency of the second resonant channel, and the resonant frequency f of the first resonant channel is equal to the working frequency of the second resonant channelr1And a resonance parameter f of said second resonance channelr2Respectively as follows:
Figure GDA0003487752620000021
Figure GDA0003487752620000022
preferably, the load resistor R1And the load resistor R2When the power supply voltage is not equal to the preset value, the double power supply port isolated DC/DC converter realizes unbalanced power supply,
uo1＝0.5UinG1
Figure GDA0003487752620000031
ωs＝2πfs
the G is1Is the voltage gain of the first resonant channel, ωsIs the angular frequency, said fsFor the switching frequency of said Lm1For said transformer T1The excitation inductance of (b), said nT1For a transformer T1The transformation ratio of (a);
uo2＝0.5UinG2
Figure GDA0003487752620000032
the G is2Is the voltage gain of the second resonant channel, Lm2For said transformer T2The excitation inductance of, said nT2For a transformer T2The transformation ratio of (a).
Preferably, the control waveform of the double-power-supply-port isolated DC/DC converter is a PFM waveform;
or the control waveform of the double-power-supply-port isolated DC/DC converter is a PWM waveform;
or the control waveform of the double-power-supply-port isolated DC/DC converter is the combination of the PFM waveform and the PWM waveform.
Preferably, the control signal s1Is said Q1Control signal of, control signal s2Is said Q2Of said control signal s1And said s2180 degrees out of phase.
Preferably, said Q1And said Q2Both with a parallel capacitor and an anti-parallel diode.
According to the technical scheme, the double-power-supply-port isolation type DC/DC converter provided by the embodiment of the invention can be applied to a multi-load application scene, a power supply is not required to be added, electrical isolation can be provided between a load and a power supply, electrical isolation can be provided for two direct current loads, and the hardware cost is low. Compared with other traditional multi-port power supply circuits, the converter provided by the invention only uses 2 full-control switching devices. The converter provided by the invention can realize the on-off of the soft switch, is favorable for reducing the switching loss, is more favorable for reducing the volumes of the capacitor and the inductor, and realizes high power density.
Drawings
Fig. 1 is a schematic circuit diagram of a dual-supply-port isolated DC/DC converter according to an embodiment of the present invention.
FIG. 2 is a diagram of s of the current transformer shown in FIG. 1 according to an embodiment of the present invention1And s2A waveform diagram of (a).
Fig. 3 is a schematic diagram illustrating that the second resonant channel in the converter shown in fig. 1 can still work normally after the first resonant channel fails according to an embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating that the first resonant channel of the converter shown in fig. 1 can still work normally after the second resonant channel fails according to an embodiment of the present invention.
In the figure: input power supply UinControl signal s1Control signal s2Fully-controlled switching device Q1Fully-controlled switching device Q2Resonant inductor Lr1Resonant inductor Lr2Resonant capacitor Cr1Resonant capacitor Cr2And an excitation inductor Lm1And an excitation inductor Lm2Transformer T1Transformer T2Diode D1Diode D2Diode D3Diode D4Filter capacitor Co1Filter capacitor Co2Load resistance R1Load resistance R2Load resistance R1Supply voltage uo1Load resistance R2Of the supply voltage uo2Current ir1Current ir2Node a, node b, node c.
Detailed Description
The technical scheme and the technical effect of the invention are further elaborated in the following by combining the drawings of the invention.
Aiming at a multi-load application scene, the invention provides a double-power-supply-port isolated DC/DC converter which can provide electrical isolation between a load and a power supply and also provide electrical isolation for two direct current loads. Meanwhile, the converter can realize the on-off of the soft switch, is favorable for reducing the switching loss, is more favorable for reducing the volumes of the capacitor and the inductor, and can realize low-cost, high-efficiency and high-power-density dual-port power supply.
As shown in fig. 1, a dual-supply-port isolated DC/DC converter provided in the embodiment of the present invention includes a first resonant channel and a second resonant channel, where the first resonant channel is used as a load resistor R1Input supply voltage uo1The second resonant channel is used as a load resistor R2Input supply voltage uo2：
The first resonant channel is connected to the input power supply UinIncluding a fully-controlled switching device Q1Resonant inductor Lr1Resonant capacitor Cr1And an excitation inductor Lm1Transformer T1Diode D1Diode D2Filter capacitor Co1Load resistance R1；
The second resonant channel is connected to the input power supply UinIncluding a fully-controlled switching device Q2Resonant inductor Lr2Resonant capacitor Cr2And an excitation inductor Lm2Transformer T2Diode D3Diode D4Filter capacitor Co2Load resistance R2；
Q1And Q2In series, Q1Is connected to an input power supply UinPositive electrode of (2), Q2Is connected to UinNegative electrode of (1), T1One end of the primary winding is connected in series with Lr1Is connected to UinPositive electrode of (2), T1The other end of the primary winding is connected in series with Cr1Post-connected to Q1And Q2Node b, T between2One end of the primary winding is connected in series with Lr2Back-connected to nodes a, T2The other end of the primary winding is connected in series with Cr2Back connection to UinThe negative electrode of (1);
T1comprising 2 secondary windings, T1One of the secondary windings of (2) is connected to (D)1Anode of (2), T1Is connected with another secondary winding D2Anode of (D)1And D2Is connected to node b, a load resistor R1One end of which is connected to node b and the other end is connected to T1A center-tapped winding of Co1And R1Connecting in parallel; t is a unit of2Comprising 2 secondary windings, T2One of the secondary windings of (2) is connected to (D)3Anode of (2), T2Is connected to the other secondary winding D4Anode of (D)3And D4Is connected to node c, a load resistor R2One end of which is connected to node c and the other end of which is connected to T2Is tapped at the centerWinding, Co2And R2Parallel connection;
Lm1connection T1Between 2 primary windings of Lm2Is connected at T2Between 2 primary windings, Q1And Q2Both with a parallel capacitor and an anti-parallel diode.
The above is the composition and circuit connection mode of the dual power supply port isolated DC/DC converter of the present invention, and the converter shown in fig. 1 can provide DC power supply for two paths of DC loads, i.e. 1 input power UinTo the load resistance R1And R2Supply of electricity, R1And R2Can pass through transformer T1And T2Realize electrical isolation and input power supply UinAnd a load resistance R1Can pass through the transformer T1Providing electrical isolation, input power UinAnd a load resistance R2Can pass through the transformer T2Providing electrical isolation.
The double-power-supply-port isolated DC/DC converter can realize zero-voltage switching on of the primary side and zero-current switching off of the secondary side, namely the converter can realize soft switching and has small switching loss. Because soft switching can be realized, the switching frequency can be improved, the volumes of an inductor and a capacitor can be further reduced, and the power density of the converter can be improved.
In the circuit of the converter shown in fig. 1, the first resonant channel and the second resonant channel have the same operating frequency, and the resonant frequency f of the first resonant channel is equal tor1And the resonance parameter f of the second resonance channelr2Respectively as follows:
Figure GDA0003487752620000061
Figure GDA0003487752620000062
in the double-power-supply-port isolated DC/DC converter provided by the embodiment of the invention, two DC loads can be unequal, and the load resistance R1Of the supply voltage uo1Can be connected with a load resistor R2Of the supply voltage uo2Inequality uo1≠uo2The double-power-supply-port isolated DC/DC converter realizes unbalanced power supply and can provide direct-current voltage for loads with unequal two power supply voltages, wherein:
uo1＝0.5UinG1 (3)
Figure GDA0003487752620000063
ωs＝2πfs (5)
G1is the voltage gain, ω, of the first resonant channelsIs the angular frequency, fsIs a switching frequency Lm1For a transformer T1Excitation inductance of, nT1For a transformer T1The transformation ratio of (a);
uo2＝0.5UinG2 (6)
Figure GDA0003487752620000071
G2is the voltage gain, L, of the second resonant channelm2For a transformer T2Excitation inductance of (n)T2For a transformer T2The transformation ratio of (a).
In the double-power-supply-port isolated DC/DC converter, a control signal s1Is Q1Control signal of, control signal s2Is Q2Control signal of s1And s2180 degrees out of phase. As shown in FIG. 2, s1And s2Are all PWM waves, s, with a duty cycle of 50%1And s2Is in a complementary state. In special cases, s is used to regulate one or both of the 2 supply voltages1And s2The duty ratio of (2) can be adjusted between 0 and 50%.
The converter can adopt Pulse Frequency Modulation (PFM) technology, also can adopt Pulse Width Modulation (PWM) technology, and also can adopt the technology of combining PFM and PWM to control. Accordingly, the control waveform of the converter is a PFM waveform, a PWM waveform or a combination of the PFM waveform and the PWM waveform.
In the converter circuit shown in the invention, if one of the power supply channels fails or is damaged, only two full-control devices Q at the primary side are needed1And Q2The power supply voltage is not damaged, and the other load can still obtain a reliable power supply voltage, fig. 3 is a schematic diagram of the normal operation of the second channel after the failure of the first resonant channel in the converter shown in fig. 1, and fig. 4 is a schematic diagram of the normal operation of the first channel after the failure of the second resonant channel in the converter shown in fig. 1.
The double-power-supply-port isolated DC/DC converter provided by the embodiment of the invention can be applied to a multi-load application scene, does not need to increase a power supply, can provide electrical isolation between a load and a power supply, and also provides electrical isolation for two direct current loads, so that the hardware cost is low. Compared with other traditional multi-port power supply circuits, the converter provided by the invention only uses 2 fully-controlled switching devices. The converter provided by the invention realizes the switching on and off of the soft switch, is beneficial to reducing the switching loss, is more beneficial to reducing the volumes of the capacitor and the inductor, and realizes high power density.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (4)

1. A dual supply port isolated DC/DC converter, comprising: a first resonant channel and a second resonant channel, the first resonant channel is used as a load resistor R1Input supply voltage uo1The second resonant channel is used as a load resistor R2Input supply voltage uo2；
The first resonant channel is connected to an input power supply UinIs turning toPoles comprising fully-controlled switching devices Q1Resonant inductor Lr1Resonant capacitor Cr1And an excitation inductor Lm1Transformer T1Diode D1Diode D2Filter capacitor Co1Load resistance R1；
The second resonant channel is connected to an input power supply UinIncluding a fully-controlled switching device Q2Resonant inductor Lr2Resonant capacitor Cr2And an excitation inductor Lm2Transformer T2Diode D3Diode D4Filter capacitor Co2Load resistance R2；
Said Q1And said Q2In series, said Q1Is connected to an input power supply UinThe positive electrode of (1), the Q2Is connected to the UinOf the negative electrode, the T1One end of the primary winding is connected in series with the Lr1Is then connected to the UinThe positive electrode of (1), the positive electrode of (T)1The other end of the primary winding is connected in series with the Cr1Post-connected to said Q1And said Q2A node a between, the T2One end of the primary winding is connected in series with the Lr2Is then connected to the node a, the T2The other end of the primary winding is connected in series with the Cr2Is then connected to the UinThe negative electrode of (1);
the T is1Comprising 2 secondary windings, T1One secondary winding of (2) is connected with the D1The anode of (a), the T1Is connected to said D2The anode of (D)1And the cathode and the anode2Is connected to node b, the load resistor R1One end of which is connected to the node b and the other end of which is connected to the T1C, said Co1And said R1Parallel connection;
the T is2Comprising 2 secondary windings, T2One secondary winding of (2) is connected with the D3The anode of (a), the T2Is connected to said D4The anode of (D)3And the cathode and the anode4Is connected to node c, the load resistor R2One end of which is connected to the node c and the other end of which is connected to the T2C, said Co2And said R2Parallel connection;
said Lm1Is connected to the T1Between 2 primary windings of said Lm2Is connected to the T22 primary windings;
the working frequency of the first resonant channel is equal to that of the second resonant channel, and the resonant frequency f of the first resonant channel is equal to that of the second resonant channelr1And a resonance parameter f of said second resonance channelr2Respectively as follows:
Figure FDA0003487752610000021
Figure FDA0003487752610000022
the load resistor R1And the load resistor R2When the power supply voltage is not equal to the preset value, the double power supply port isolated DC/DC converter realizes unbalanced power supply,
uo1＝0.5UinG1
Figure FDA0003487752610000023
ωs＝2πfs
the G is1Is the voltage gain of the first resonant channel, ωsIs the angular frequency, said fsFor the switching frequency of said Lm1For said transformer T1The excitation inductance of (b), said nT1For a transformer T1The transformation ratio of (a);
uo2＝0.5UinG2
Figure FDA0003487752610000024
the G is2Is the voltage gain of the second resonant channel, Lm2For said transformer T2The excitation inductance of, said nT2For a transformer T2The transformation ratio of (a).
2. The dual supply port isolated DC/DC converter of claim 1,
the control waveform of the double-power-supply-port isolated DC/DC converter is a PFM waveform;
or the control waveform of the double-power-supply-port isolated DC/DC converter is a PWM waveform;
or the control waveform of the double-power-supply-port isolated DC/DC converter is the combination of the PFM waveform and the PWM waveform.
3. The dual supply port isolated DC/DC converter of claim 1, wherein the control signal s1Is said Q1Control signal of, control signal s2Is said Q2Control signal of, said s1And said s2180 degrees out of phase.
4. The dual supply port isolated DC/DC converter of claim 1, wherein the Q is1And said Q2Both with a parallel capacitor and an anti-parallel diode.
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