Isolation voltage stabilizing circuit

Abstract

The utility model discloses a kind of isolated voltage stabilizing circuit supporting bidirectional operation, high power density, including input end component and output end component;Input end component includes two input units arranged side by side;Output end component includes first output unit and second output unit arranged side by side;First input unit includes the first input capacitor connected between input port and ground port, a pair of first primary side capacitor or a pair of first power switch is connected in parallel after series connection in first input capacitor two ends, first primary side power switch and second primary side power switch are connected in first input capacitor two ends after series connection;The first primary side coil of transformer is connected between a pair of first primary side capacitor or a pair of first power switch in one end;The first primary side coil of transformer is connected between first primary side control switch and second primary side control switch in other end;Second input unit and first output unit structure are same;First output unit and second output unit are all full-bridge rectifier module or full-wave rectifier module.

Description

Technical Field

[0001] This utility model relates to a power converter, and more specifically to an isolated voltage regulator circuit. Background Technology

[0002] Currently, DC-DC power converters used in data centers, drones, and new energy vehicles primarily employ the following topologies for bidirectional operation: First, a phase-shifted full-bridge topology, which is complex to control and, while enabling soft switching, suffers from duty cycle loss. Second, an LLC topology, but with a narrow operating voltage range and PFM frequency modulation control, resulting in complex control, poor dynamic response, and startup stress issues. Third, a full-bridge topology, which allows for convenient duty cycle control but requires additional filter inductors and has low power density. A wide input voltage single-stage LLC isolated voltage regulator circuit is disclosed in patent 202111619544.2. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an isolated voltage regulator circuit that supports bidirectional operation, has low output ripple, high power density, and duty cycle control.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an isolated voltage regulator circuit, including an input terminal component and an output terminal component; the input terminal component includes a first input unit and a second input unit arranged in parallel; the output terminal component includes a first output unit and a second output unit arranged in parallel.

[0005] The first input unit includes a first input capacitor connected between the input port and the ground port; a pair of first primary capacitors or a pair of first power switches connected in series and then in parallel across the first input capacitor; a first primary power switch and a second primary power switch connected in series and then in parallel across the first input capacitor; one end of the first primary coil of the transformer is connected between the pair of first primary capacitors or the pair of first power switches; the other end of the first primary coil of the transformer is connected between the first primary control switch and the second primary control switch.

[0006] The second input unit includes a second input capacitor connected between the input port and the ground port; a pair of second primary capacitors or a pair of second power switches connected in series and then in parallel across the second input capacitor; a third primary power switch and a fourth primary power switch connected in series and then in parallel across the second input capacitor; one end of the second primary coil of the transformer is connected between the pair of second primary capacitors or the pair of second power switches; the other end of the second primary coil of the transformer is connected between the third primary control switch and the fourth primary control switch.

[0007] Both the first output unit and the second output unit are full-bridge rectifier modules or full-wave rectifier modules;

[0008] When both the first output unit and the second output unit are full-bridge rectifier modules; the first output unit includes a first full-bridge secondary power switch and a second full-bridge secondary power switch connected in series, as well as a third full-bridge secondary power switch and a fourth full-bridge secondary power switch connected in series, with one end of the second full-bridge secondary power switch grounded; one end of the third full-bridge secondary power switch is connected to the same-name terminal of the first coupling inductor, and the other end of the fourth full-bridge secondary power switch is grounded; one end of the first full-bridge secondary power switch is connected to the same-name terminal of the first coupling inductor, and the opposite-name terminal of the first coupling inductor is connected to the output capacitor, with the other end of the output capacitor grounded; one end of the first secondary coil of the transformer is connected between the first full-bridge secondary power switch and the second full-bridge secondary power switch, and the other end of the first secondary coil of the transformer is connected between the third full-bridge secondary power switch and the fourth full-bridge secondary power switch;

[0009] The second output unit includes a fifth full-bridge secondary power switch and a sixth full-bridge secondary power switch connected in series, as well as a seventh full-bridge secondary power switch and an eighth full-bridge secondary power switch connected in series. One end of the sixth full-bridge secondary power switch is grounded; one end of the seventh full-bridge secondary power switch is connected to the opposite-named terminal of the second coupling inductor, and the other end of the eighth full-bridge secondary power switch is grounded; one end of the fifth full-bridge secondary power switch is connected to the same-named terminal of the second coupling inductor, and the same-named terminal of the second coupling inductor is connected to the end of the output capacitor furthest from ground; one end of the second secondary coil of the transformer is connected between the fifth full-bridge secondary power switch and the sixth full-bridge secondary power switch, and the other end of the second secondary coil of the transformer is connected between the seventh full-bridge secondary power switch and the eighth full-bridge secondary power switch;

[0010] When both the first output unit and the second output unit are full-wave rectifier modules; the first output unit includes a first full-wave secondary power switch and a second full-wave secondary power switch respectively connected to the two ends of the first secondary coil of the transformer. The other ends of the first full-wave secondary power switch and the second full-wave secondary power switch are both grounded. The middle part of the first secondary coil of the transformer is connected to the same-name terminal of the first coupling inductor through a wire. The opposite-name terminal of the first coupling inductor is connected to the output capacitor. The other end of the output capacitor is grounded.

[0011] The second output unit includes a third full-wave secondary power switch and a fourth full-wave secondary power switch, which are respectively connected to the two ends of the second secondary coil of the transformer. The other ends of the third full-wave secondary power switch and the fourth full-wave secondary power switch are grounded. The middle part of the second secondary coil of the transformer is connected to the opposite end of the second coupling inductor through a wire. The same end of the second coupling inductor is connected to the end of the output capacitor away from ground.

[0012] As a preferred embodiment, the first coupled inductor and the second coupled inductor share a common magnetic core.

[0013] As a preferred embodiment, a filter inductor is connected to the input port, and the other end of the filter inductor is connected to the first input unit and the second input unit respectively via wires.

[0014] As a preferred embodiment, the input port is located on the side of the filter inductor away from the first input unit and the second input unit, and a filter capacitor is connected to it via a wire. The other end of the filter capacitor is grounded via a wire.

[0015] The beneficial effects of this utility model are:

[0016] (1) Multi-phase interleaved parallel technology was adopted, which increased the output power and reduced the current ripple.

[0017] (2) The use of coupled inductors reduced the size of magnetic components and increased power density.

[0018] (3) The use of anti-phase coupling technology increases the steady-state inductance, reduces the output ripple, and at the same time reduces the dynamic inductance, resulting in a fast dynamic response rate.

[0019] (4) It supports bidirectional operation, and the power can flow from the low-voltage side to the high-voltage side.

[0020] (5) Adjustable duty cycle control mode, easy to control output voltage. Suitable for data center power supply, vehicle power supply, and tethered applications.

[0021] Applications include human-machine power supply and other scenarios. Attached Figure Description

[0022] Figure 1 This is the isolation voltage regulator circuit topology of Example 1.

[0023] Figure 2 This is the equivalent diagram of the first modal operation in Example 1.

[0024] Figure 3 This is the equivalent diagram of the second modal operation in Example 1.

[0025] Figure 4 This is the equivalent diagram of the third mode of operation in Example 1.

[0026] Figure 5 This is the equivalent diagram of the fourth modal operation in Example 1.

[0027] Figure 6 This is the equivalent diagram of the fifth modal operation in Example 1.

[0028] Figure 7 This is the equivalent diagram of the sixth mode of operation in Example 1.

[0029] Figure 8 The waveform diagram is shown when Example 1 is in operation.

[0030] Figure 9 This is a schematic diagram of a reverse-coupled inductor.

[0031] Figure 10 This is the isolation voltage regulator circuit topology of Example 2.

[0032] Figure 11 This is the isolation voltage regulator circuit topology of Example 3.

[0033] Figure 12 This is the isolation voltage regulator circuit topology of Example 4. Detailed Implementation

[0034] The specific implementation scheme of this utility model will now be described in detail with reference to the accompanying drawings.

[0035] Example 1 Figure 1 As shown, an isolated voltage regulator circuit includes an input component and an output component; the input component includes a first input unit and a second input unit arranged in parallel; the output component includes a first output unit and a second output unit arranged in parallel.

[0036] The first input unit includes a first input capacitor Cin1 connected between the input port Vin and the ground port; a pair of first primary capacitors C1 and C2 connected in series and then in parallel across the first input capacitor Cin1; a first primary power switch S1 and a second primary power switch S2 connected in series and then in parallel across the first input capacitor Cin1; one end of the first primary coil A of the transformer is connected between the pair of first primary capacitors C1 and C2; the other end of the first primary coil A of the transformer is connected between the first primary control switch S1 and the second primary control switch S2.

[0037] The second input unit includes a second input capacitor Cin2 connected between the input port Vin and the ground port; a pair of second primary capacitors C3 and C4 connected in series and then in parallel across the second input capacitor Cin2; a third primary power switch S3 and a fourth primary power switch S4 connected in series and then in parallel across the second input capacitor Cin2; one end of the second primary coil B of the transformer is connected between the pair of second primary capacitors C3 and C4; the other end of the second primary coil B of the transformer is connected between the third primary control switch S3 and the fourth primary control switch S4.

[0038] A filter inductor Lin is connected to the input port Vin. The other end of the filter inductor Lin is connected to the first input unit and the second input unit via wires. A filter capacitor Cin is connected to the input port Vin on the side of the filter inductor away from the first and second input units via wires. The other end of the filter capacitor Cin is grounded via a wire.

[0039] Both the first output unit and the second output unit are full-bridge rectifier modules. The first output unit includes a first full-bridge secondary power switch S5 and a second full-bridge secondary power switch S6 connected in series, as well as a third full-bridge secondary power switch S7 and a fourth full-bridge secondary power switch S8 connected in series. One end of the second full-bridge secondary power switch S6 is grounded. One end of the third full-bridge secondary power switch S7 is connected to the same-name terminal of the first coupling inductor L1, and the other end of the fourth full-bridge secondary power switch S8 is grounded. One end of the first full-bridge secondary power switch S5 is connected to the same-name terminal of the first coupling inductor L1, and the opposite-name terminal of the first coupling inductor L1 is connected to the output capacitor C0. The other end of the output capacitor C0 is grounded. One end of the first secondary coil of the transformer is connected between the first full-bridge secondary power switch S5 and the second full-bridge secondary power switch S6, and the other end of the first secondary coil of the transformer is connected between the third full-bridge secondary power switch S7 and the fourth full-bridge secondary power switch S8.

[0040] The second output unit includes a fifth full-bridge secondary power switch S9 and a sixth full-bridge secondary power switch S10 connected in series, and a seventh full-bridge secondary power switch S11 and an eighth full-bridge secondary power switch S12 connected in series. One end of the sixth full-bridge secondary power switch S10 is grounded; one end of the seventh full-bridge secondary power switch S11 is connected to the opposite-named terminal of the second coupling inductor L2, and the other end of the eighth full-bridge secondary power switch S12 is grounded; one end of the fifth full-bridge secondary power switch S9 is connected to the same-named terminal of the second coupling inductor L2, and the same-named terminal of the second coupling inductor L2 is connected to the end of the output capacitor C0 furthest from ground; the first coupling inductor L1 and the second coupling inductor L2 share a common magnetic core. One end of the second secondary coil of the transformer is connected between the fifth full-bridge secondary power switch S9 and the sixth full-bridge secondary power switch S10, and the other end of the second secondary coil of the transformer is connected between the seventh full-bridge secondary power switch S11 and the eighth full-bridge secondary power switch S12.

[0041] Figure 2-7 The equivalent circuit of the proposed topology is divided into 6 modes, with the first three modes being symmetrical to the last three, forming a complete cycle. The inductor current frequency is equivalent to a multiple of the frequency. Here, an example with a duty cycle greater than 0.25 is taken.

[0042] Modal I such Figure 2 , 8 As shown, the first primary-side control switch S1 is turned on, the first full-bridge secondary-side power switch S5 and the fourth full-bridge secondary-side power switch S8 are turned on, the first primary-side coil A of the transformer is given a positive voltage, the second primary-side coil B of the transformer is given a zero voltage, the inductor of the first primary-side coil A of the transformer is given a positive voltage, and the current increases; the inductor of the second primary-side coil B of the transformer has an equivalent freewheeling current, which is a negative voltage, and the current decreases; at the same time, the two inductors are coupled, and the current slope is different from that of the traditional half-bridge.

[0043] Mode II such as Figure 3 , 8 As shown, the first primary-side control switch S1 is turned on, the first full-bridge secondary-side power switch S5 and the fourth full-bridge secondary-side power switch S8 are turned on, the third primary-side control switch S3 is turned on, the fifth full-bridge secondary-side power switch S9 and the eighth full-bridge secondary-side power switch S12 are turned on, and the first primary-side coil A of the transformer is given a positive voltage. The second primary-side coil B of the transformer is also given a positive voltage. When the inductor of the first primary-side coil A of the transformer is given a positive voltage, the current increases. When the inductor of the second primary-side coil B of the transformer is given a positive voltage, the current increases. At the same time, the two inductors are coupled, and the current slope is different from that of a traditional half-bridge.

[0044] Mode III such as Figure 4 , 8 As shown, the first full-bridge secondary power switch S5, the second full-bridge secondary power switch S6, the third full-bridge secondary power switch S7, and the fourth full-bridge secondary power switch S8 are turned on. The third primary control switch S3 is turned on. The fifth full-bridge secondary power switch S9 and the eighth full-bridge secondary power switch S12 are turned on. The first primary winding A of the transformer is given zero voltage, and the second primary winding B of the transformer is given positive voltage. The inductance of the first primary winding A of the transformer is equivalent to freewheeling, which is a negative voltage, and the current decreases. The inductance of the second primary winding B of the transformer is given positive voltage, and the current increases. At the same time, the two inductors are coupled, and the current slope is different from that of a traditional half-bridge.

[0045] Modal IV such Figure 5 , 8 As shown, the second primary-side control switch S2 is turned on, the second full-bridge secondary-side power switch S6 and the third full-bridge secondary-side power switch S7 are turned on, the fifth full-bridge secondary-side power switch S9, the sixth full-bridge secondary-side power switch S10, the seventh full-bridge secondary-side power switch S11, and the eighth full-bridge secondary-side power switch S12 are turned on. The first primary-side coil A of the transformer is given a negative voltage, and the second primary-side coil B of the transformer is given zero voltage. The inductance of the first primary-side coil A of the transformer is given a positive voltage, and the current increases. The inductance of the second primary-side coil B of the transformer is equivalent to freewheeling, which is a negative voltage, and the current decreases. At the same time, the two inductors are coupled, and the current slope is different from that of a traditional half-bridge.

[0046] Modal V such Figure 6 , 8 As shown, the second primary-side control switch S2 is turned on, the second full-bridge secondary-side power switch S6 and the third full-bridge secondary-side power switch S7 are turned on, the fourth primary-side control switch S4 is turned on, and S10 and S11 are turned on. The first primary-side coil A of the transformer is given a negative voltage, and the second primary-side coil B of the transformer is also given a negative voltage. The inductor of the first primary-side coil A of the transformer is given a positive voltage, and the current increases. The inductor of the second primary-side coil B of the transformer is given a positive voltage, and the current increases. At the same time, the two inductors are coupled, and the current slope is different from that of a traditional half-bridge.

[0047] Modal VI such as Figure 7 , 8 As shown, switches S5, S6, S7, and S8 are turned on, the fourth primary-side control switch S4 is turned on, and the sixth full-bridge secondary-side power switch S10 and the seventh full-bridge secondary-side power switch S11 are turned on. The first primary-side coil A of the transformer is given zero voltage, and the second primary-side coil B of the transformer is given positive voltage. The inductance of the first primary-side coil A of the transformer is equivalent to freewheeling, which is a negative voltage, and the current decreases. The inductance of the second primary-side coil B of the transformer is given positive voltage, and the current increases. At the same time, the two inductors are coupled, and the current slope is different from that of a traditional half-bridge.

[0048] like Figure 9 The diagram shown is a schematic of a reverse-coupled inductor. Equations (1) and (2) can be obtained from the basic formula for coupled inductors:

[0049]

[0050] Using a symmetrical design, let L1 = L2 = L, then the mutual inductance is M = kL, where k < 0 is the coupling coefficient. Further derivation yields equation (3):

[0051]

[0052] Based on the relationship between v1 and v2, equation (3) is simplified to the form of equation (4), which is similar to the Buck circuit formula in general.

[0053]

[0054] For ease of subsequent derivation, let va and vb be defined as equations (5) and (6) respectively: v b =-V o <0(6);

[0055] When the duty cycle D > 0.25, there are three voltage conditions for the two inductors: First, L1 is positive and L2 is negative; the voltages are given by equations (7) and (8) respectively: v1 = v a (7); v2 = v b =-V o (8);

[0056] The relationship between v2 and v1 can be derived as equation (9):

[0057] Combining equation (3) with equation (10), the equivalent inductance Leq1 for this stage is given by equation (10):

[0058] The second type: L1 positive voltage, L2 positive voltage; their voltages are respectively Equation (11) and Equation (12): v1 = v a (11); v2 = v a(12);

[0059] It can be derived that the relationship between v2 and v1 is expressed as formula (13): v2=v1(13);

[0060] By combining with formula (3), the equivalent inductance Leq2 of this stage is obtained as formula (14): L eq2 =(1+k)L (14).

[0061] Third case: L1 has negative voltage and L2 has positive voltage; their voltages are expressed as formula (15) and formula (16) respectively: v1=v b =-V o <0(15); v2=v a (16);

[0062] It can be derived that the relationship between v2 and v1 is expressed as formula (17):

[0063] By combining with formula (3), the equivalent inductance Leq3 of this stage is obtained as formula (18):

[0064] When the duty cycle is greater than 0.25, the current ripple is determined by Leq3; setting Leq3>L gives the condition for increasing the equivalent inductance (that is, the condition for reducing ripple) expressed as formula (19):

[0065] Analyzing the dynamic equivalent inductance, the factors affecting the current rising rate are: duty cycle increment, input voltage, and equivalent inductance Leq2;

[0066] Since reverse coupling satisfies k<0, it can be known that Leq2=(1+k)L<L, so the dynamic equivalent inductance decreases, which means that the proposed topology using coupled inductance significantly improves the dynamic performance of the converter.

[0067] Embodiment 2 is as Figure 10 shown, an isolated voltage stabilizing circuit includes an input end component and an output end component; the input end component includes a first input unit and a second input unit arranged in parallel; the output end component includes a first output unit and a second output unit arranged in parallel;

[0068] The first input unit includes a first input capacitor Cin1 connected between the input port Vin and the ground port, a pair of first power switches Sa1 and Sa2 are connected in series and then connected in parallel across the two ends of the first input capacitor Cin1, a first primary power switch S1 and a second primary power switch S2 are connected in series and then connected in parallel across the two ends of the first input capacitor Cin1; one end of the first primary coil A of the transformer is connected between the pair of first power switches Sa1 and Sa2; the other end of the first primary coil A of the transformer is connected between the first primary control switch S1 and the second primary control switch S2;

[0069] The second input unit includes a second input capacitor Cin2 connected between the input port Vin and the ground port; a pair of second power switches Sa3 and Sa4 connected in series and then in parallel across the second input capacitor Cin2; a third primary power switch S3 and a fourth primary power switch S4 connected in series and then in parallel across the second input capacitor Cin2; one end of the second primary coil B of the transformer is connected between the pair of second power switches Sa3 and Sa4; the other end of the second primary coil B of the transformer is connected between the third primary control switch S3 and the fourth primary control switch S4.

[0070] A filter inductor Lin is connected to the input port Vin. The other end of the filter inductor Lin is connected to the first input unit and the second input unit via wires. A filter capacitor Cin is connected to the input port Vin on the side of the filter inductor away from the first and second input units via wires. The other end of the filter capacitor Cin is grounded via a wire.

[0071] Both the first output unit and the second output unit are full-bridge rectifier modules. The first output unit includes a first full-bridge secondary power switch S5 and a second full-bridge secondary power switch S6 connected in series, as well as a third full-bridge secondary power switch S7 and a fourth full-bridge secondary power switch S8 connected in series. One end of the second full-bridge secondary power switch S6 is grounded. One end of the third full-bridge secondary power switch S7 is connected to the same-name terminal of the first coupling inductor L1, and the other end of the fourth full-bridge secondary power switch S8 is grounded. One end of the first full-bridge secondary power switch S5 is connected to the same-name terminal of the first coupling inductor L1, and the opposite-name terminal of the first coupling inductor L1 is connected to the output capacitor C0. The other end of the output capacitor C0 is grounded. One end of the first secondary coil of the transformer is connected between the first full-bridge secondary power switch S5 and the second full-bridge secondary power switch S6, and the other end of the first secondary coil of the transformer is connected between the third full-bridge secondary power switch S7 and the fourth full-bridge secondary power switch S8.

[0072] The second output unit includes a fifth full-bridge secondary power switch S9 and a sixth full-bridge secondary power switch S10 connected in series, and a seventh full-bridge secondary power switch S11 and an eighth full-bridge secondary power switch S12 connected in series. One end of the sixth full-bridge secondary power switch S10 is grounded; one end of the seventh full-bridge secondary power switch S11 is connected to the opposite-named terminal of the second coupling inductor L2, and the other end of the eighth full-bridge secondary power switch S12 is grounded; one end of the fifth full-bridge secondary power switch S9 is connected to the same-named terminal of the second coupling inductor L2, and the same-named terminal of the second coupling inductor L2 is connected to the end of the output capacitor C0 furthest from ground; the first coupling inductor L1 and the second coupling inductor L2 share a common magnetic core. One end of the second secondary coil of the transformer is connected between the fifth full-bridge secondary power switch S9 and the sixth full-bridge secondary power switch S10, and the other end of the second secondary coil of the transformer is connected between the seventh full-bridge secondary power switch S11 and the eighth full-bridge secondary power switch S12.

[0073] Example 3 Figure 11 As shown, an isolated voltage regulator circuit includes an input component and an output component; the input component includes a first input unit and a second input unit arranged in parallel; the output component includes a first output unit and a second output unit arranged in parallel.

[0074] The first input unit includes a first input capacitor Cin1 connected between the input port Vin and the ground port; a pair of first primary capacitors C1 and C2 connected in series and then in parallel across the first input capacitor Cin1; a first primary power switch S1 and a second primary power switch S2 connected in series and then in parallel across the first input capacitor Cin1; one end of the first primary coil A of the transformer is connected between the pair of first primary capacitors C1 and C2; the other end of the first primary coil A of the transformer is connected between the first primary control switch S1 and the second primary control switch S2.

[0075] The second input unit includes a second input capacitor Cin2 connected between the input port Vin and the ground port; a pair of second primary capacitors C3 and C4 connected in series and then in parallel across the second input capacitor Cin2; a third primary power switch S3 and a fourth primary power switch S4 connected in series and then in parallel across the second input capacitor Cin2; one end of the second primary coil B of the transformer is connected between the pair of second primary capacitors C3 and C4; the other end of the second primary coil B of the transformer is connected between the third primary control switch S3 and the fourth primary control switch S4.

[0076] A filter inductor Lin is connected to the input port Vin. The other end of the filter inductor Lin is connected to the first input unit and the second input unit via wires. A filter capacitor Cin is connected to the input port Vin on the side of the filter inductor away from the first and second input units via wires. The other end of the filter capacitor Cin is grounded via a wire.

[0077] Both the first output unit and the second output unit are full-wave rectifier modules; the first output unit includes a first full-wave secondary power switch Sb1 and a second full-wave secondary power switch Sb2 respectively connected to the two ends of the first secondary coil of the transformer. The other ends of the first full-wave secondary power switch Sb1 and the second full-wave secondary power switch Sb2 are grounded. The middle part of the first secondary coil of the transformer is connected to the same-name terminal of the first coupling inductor L1 through a wire. The opposite-name terminal of the first coupling inductor L1 is connected to the output capacitor C0. The other end of the output capacitor C0 is grounded.

[0078] The second output unit includes a third full-wave secondary power switch Sb3 and a fourth full-wave secondary power switch Sb4 connected to the two ends of the second secondary coil of the transformer, respectively. The other ends of the third full-wave secondary power switch Sb3 and the fourth full-wave secondary power switch Sb4 are grounded. The middle part of the second secondary coil of the transformer is connected to the opposite end of the second coupling inductor L2 through a wire. The same-name end of the second coupling inductor L2 is connected to the end of the output capacitor C0 away from ground. The first coupling inductor L1 and the second coupling inductor L2 share a common magnetic core.

[0079] Example 4 Figure 12 As shown, an isolated voltage regulator circuit includes an input component and an output component; the input component includes a first input unit and a second input unit arranged in parallel; the output component includes a first output unit and a second output unit arranged in parallel.

[0080] The first input unit includes a first input capacitor Cin1 connected between the input port Vin and the ground port; a pair of first power switches Sa1 and Sa2 connected in series and then in parallel across the first input capacitor Cin1; a first primary-side power switch S1 and a second primary-side power switch S2 connected in series and then in parallel across the first input capacitor Cin1; one end of the first primary-side coil A of the transformer is connected between the pair of first power switches Sa1 and Sa2; the other end of the first primary-side coil A of the transformer is connected between the first primary-side control switch S1 and the second primary-side control switch S2.

[0081] The second input unit includes a second input capacitor Cin2 connected between the input port Vin and the ground port; a pair of second power switches Sa3 and Sa4 connected in series and then in parallel across the second input capacitor Cin2; a third primary power switch S3 and a fourth primary power switch S4 connected in series and then in parallel across the second input capacitor Cin2; one end of the second primary coil B of the transformer is connected between the pair of second power switches Sa3 and Sa4; the other end of the second primary coil B of the transformer is connected between the third primary control switch S3 and the fourth primary control switch S4.

[0082] A filter inductor Lin is connected to the input port Vin. The other end of the filter inductor Lin is connected to the first input unit and the second input unit via wires. A filter capacitor Cin is connected to the input port Vin on the side of the filter inductor away from the first and second input units via wires. The other end of the filter capacitor Cin is grounded via a wire.

[0083] Both the first output unit and the second output unit are full-wave rectifier modules; the first output unit includes a first full-wave secondary power switch Sb1 and a second full-wave secondary power switch Sb2 respectively connected to the two ends of the first secondary coil of the transformer. The other ends of the first full-wave secondary power switch Sb1 and the second full-wave secondary power switch Sb2 are grounded. The middle part of the first secondary coil of the transformer is connected to the same-name terminal of the first coupling inductor L1 through a wire. The opposite-name terminal of the first coupling inductor L1 is connected to the output capacitor C0. The other end of the output capacitor C0 is grounded.

[0084] The second output unit includes a third full-wave secondary power switch Sb3 and a fourth full-wave secondary power switch Sb4 connected to the two ends of the second secondary coil of the transformer, respectively. The other ends of the third full-wave secondary power switch Sb3 and the fourth full-wave secondary power switch Sb4 are grounded. The middle part of the second secondary coil of the transformer is connected to the opposite end of the second coupling inductor L2 through a wire. The same-name end of the second coupling inductor L2 is connected to the end of the output capacitor C0 away from ground. The first coupling inductor L1 and the second coupling inductor L2 share a common magnetic core.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the protection scope of the present invention.

Claims

1. An isolated voltage regulator circuit, comprising an input component and an output component; the input component includes a first input unit and a second input unit arranged in parallel; the output component includes a first output unit and a second output unit arranged in parallel. Its features are: The first input unit includes a first input capacitor connected between the input port and the ground port; a pair of first primary capacitors or a pair of first power switches connected in series and then in parallel across the first input capacitor; a first primary power switch and a second primary power switch connected in series and then in parallel across the first input capacitor; one end of the first primary coil of the transformer is connected between the pair of first primary capacitors or the pair of first power switches; the other end of the first primary coil of the transformer is connected between the first primary control switch and the second primary control switch. The second input unit includes a second input capacitor connected between the input port and the ground port; a pair of second primary capacitors or a pair of second power switches connected in series and then in parallel across the second input capacitor; a third primary power switch and a fourth primary power switch connected in series and then in parallel across the second input capacitor; one end of the second primary coil of the transformer is connected between the pair of second primary capacitors or the pair of second power switches; the other end of the second primary coil of the transformer is connected between the third primary control switch and the fourth primary control switch. Both the first output unit and the second output unit are full-bridge rectifier modules or full-wave rectifier modules; When both the first output unit and the second output unit are full-bridge rectifier modules; the first output unit includes a first full-bridge secondary power switch and a second full-bridge secondary power switch connected in series, as well as a third full-bridge secondary power switch and a fourth full-bridge secondary power switch connected in series, with one end of the second full-bridge secondary power switch grounded; one end of the third full-bridge secondary power switch is connected to the same-name terminal of the first coupling inductor, and the other end of the fourth full-bridge secondary power switch is grounded; one end of the first full-bridge secondary power switch is connected to the same-name terminal of the first coupling inductor, and the opposite-name terminal of the first coupling inductor is connected to the output capacitor, with the other end of the output capacitor grounded; one end of the first secondary coil of the transformer is connected between the first full-bridge secondary power switch and the second full-bridge secondary power switch, and the other end of the first secondary coil of the transformer is connected between the third full-bridge secondary power switch and the fourth full-bridge secondary power switch; The second output unit includes a fifth full-bridge secondary power switch and a sixth full-bridge secondary power switch connected in series, as well as a seventh full-bridge secondary power switch and an eighth full-bridge secondary power switch connected in series. One end of the sixth full-bridge secondary power switch is grounded; one end of the seventh full-bridge secondary power switch is connected to the opposite-named terminal of the second coupling inductor, and the other end of the eighth full-bridge secondary power switch is grounded; one end of the fifth full-bridge secondary power switch is connected to the same-named terminal of the second coupling inductor, and the same-named terminal of the second coupling inductor is connected to the end of the output capacitor furthest from ground; one end of the second secondary coil of the transformer is connected between the fifth full-bridge secondary power switch and the sixth full-bridge secondary power switch, and the other end of the second secondary coil of the transformer is connected between the seventh full-bridge secondary power switch and the eighth full-bridge secondary power switch; When both the first output unit and the second output unit are full-wave rectifier modules; the first output unit includes a first full-wave secondary power switch and a second full-wave secondary power switch respectively connected to the two ends of the first secondary coil of the transformer. The other ends of the first full-wave secondary power switch and the second full-wave secondary power switch are both grounded. The middle part of the first secondary coil of the transformer is connected to the same-name terminal of the first coupling inductor through a wire. The opposite-name terminal of the first coupling inductor is connected to the output capacitor. The other end of the output capacitor is grounded. The second output unit includes a third full-wave secondary power switch and a fourth full-wave secondary power switch, which are respectively connected to the two ends of the second secondary coil of the transformer. The other ends of the third full-wave secondary power switch and the fourth full-wave secondary power switch are grounded. The middle part of the second secondary coil of the transformer is connected to the opposite end of the second coupling inductor through a wire. The same end of the second coupling inductor is connected to the end of the output capacitor away from ground.

2. The isolated voltage regulator circuit as described in claim 1, characterized in that: The first coupled inductor and the second coupled inductor share the same magnetic core.

3. The isolated voltage regulator circuit as described in claim 1, characterized in that: A filter inductor is connected to the input port, and the other end of the filter inductor is connected to the first input unit and the second input unit respectively via wires.

4. The isolated voltage regulator circuit as described in claim 3, characterized in that: The input port is located on the side of the filter inductor away from the first input unit and the second input unit, and a filter capacitor is connected to it via a wire. The other end of the filter capacitor is grounded via a wire.

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