A switching resonant tank conversion circuit, chip, main board, and electronic device

Abstract

The present invention provides a switching resonant tank conversion circuit, a chip, a main board, and an electronic device, relating to the technical field of chip power supplies. Multiple groups of circuit units are topologically implemented in a parallel manner; a single transformer is provided between two adjacent parallel circuit units; the turns ratio of each transformer is 1:1; the first circuit unit in two adjacent parallel circuit units is connected to the first winding of the target transformer, and the second circuit unit in two adjacent parallel circuit units is connected to the second winding of the target transformer. The present invention realizes parallel connection through a transformer with a turns ratio of 1:1, achieving the output current balance of each group of switching resonant tank conversion circuits. Overall, the cost of the switching resonant tank conversion circuit is reduced. The structure of the switching resonant tank conversion circuit is simplified, making it less prone to errors. While improving the power cycle and efficiency of the switching resonant tank conversion circuit, the reliability of the switching resonant tank conversion circuit is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and particularly to a switched tank converter circuit, a chip, a main board, and an electronic device. Background Art

[0002] With the development of big data, cloud computing, and the Internet of Things, the power supply systems of large servers and the power supply systems of chips in servers have an increasing demand for high power quality, as well as high-efficiency and high-power-density DC / DC converters. The switched tank converter (abbreviated as STC) is a new type of power circuit structure that combines a voltage multiplier and a resonant circuit and is gradually widely used.

[0003] The switched tank converter circuit eliminates the problem of voltage and current spikes existing during the switching instant, and has the advantages of light weight, small volume, high efficiency, high power density, and integrability. It has a fixed buck or boost ratio, a maximum efficiency of up to 98%, extremely small LAYOUT (layout) area requirements, and zero current switching (ZCS), etc., and is widely used in occasions such as the power supply systems of large servers and the power supply systems of chips in servers.

[0004] In practical applications, according to requirements, the switched tank converter circuit may need to perform structural topology. For example, multiple groups of switched tank converter circuits need to be used in parallel. However, when multiple switched tank converter circuits are used in parallel, due to reasons such as errors in the input voltage of each group of switched tank converter circuits, differences in the output equivalent impedance of each group of switched tank converter circuits, or errors in component parameters, the output current values of each group of switched tank converter circuits are not equal, that is, the output currents of each group of switched tank converter circuits are unbalanced. This will cause poor power circulation, reduce the overall efficiency, and reduce the reliability of the switched tank converter circuit. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a switched tank converter circuit, a chip, a main board, and an electronic device that solve the above problems or partially solve the above problems.

[0006] The first aspect of the embodiments of the present invention provides a switched tank converter circuit, where the switched tank converter circuit includes: multiple groups of circuit units and multiple transformers, and each group of circuit units can achieve the function of the switched tank converter circuit when used alone;

[0007] Between multiple groups of the circuit units, topology is achieved through a parallel connection method;

[0008] Between two adjacent groups of circuit units connected in parallel, a single transformer is provided;

[0009] Among them, the turns ratio of each transformer is 1:1;

[0010] In the two adjacent parallel circuit units, the first circuit unit is connected to the first winding of the single transformer, and the second circuit unit in the two adjacent parallel circuit units is connected to the second winding of the single transformer.

[0011] Optionally, the single transformer includes: a T_Balance integrated transformer with a turns ratio of 1:1 or a coil transformer with a turns ratio of 1:1.

[0012] Optionally, the inductance values of the equivalent inductances of the two windings in each transformer are equal or unequal;

[0013] Among the multiple groups of the parallel circuit units, the voltage value of the input voltage of each group of circuit units is equal to or unequal to the voltage value of the input voltage of other groups of circuit units;

[0014] Among the multiple groups of the parallel circuit units, the impedance value of the output equivalent impedance of each group of circuit units is equal to or unequal to the impedance value of the output equivalent impedance of other groups of circuit units;

[0015] Among the multiple groups of the parallel circuit units, the parameters of the resonant components used in each group of circuit units have no error or the error is within a preset range compared with the parameters of the resonant components used in other groups of circuit units.

[0016] Optionally, among the multiple groups of the parallel circuit units, the current value of the output current of each group of circuit units is equal to the current value of the output current of other groups of circuit units.

[0017] Optionally, one end of the first winding is connected to the first switch group in the first circuit unit, and the other end of the first winding is connected to the second switch group in the first circuit unit;

[0018] One end of the second winding is connected to the third switch group in the second circuit unit, and the other end of the second winding is connected to the fourth switch group in the second circuit unit.

[0019] Optionally, the first switch group, the second switch group, the third switch group, and the fourth switch group each include: two field effect transistors connected in series; the first circuit unit further includes: a first resonant capacitor; the second circuit unit further includes: a second resonant capacitor;

[0020] One end of the first resonant capacitor is connected to the connection point of the first switch group, the other end of the first resonant capacitor is connected to one end of the first winding, and the other end of the first winding is connected to the connection point of the second switch group;

[0021] One end of the second resonant capacitor is connected to the connection point of the third switch group, the other end of the second resonant capacitor is connected to one end of the second winding, and the other end of the second winding is connected to the connection point of the fourth switch group, where the connection point is the position where two series-connected field effect transistors in each switch group are interconnected.

[0022] Optionally, after n groups of the circuit units are topologically connected in parallel based on n - 1 transformers, the input voltage value is increased to a preset high voltage value and then output; or,

[0023] After n groups of the circuit units are topologically connected in parallel based on n - 1 transformers, the input voltage value is decreased to a preset low voltage value and then output.

[0024] In a second aspect of the embodiments of the present invention, a chip is provided, and the power supply structure of the chip adopts the switched resonant tank conversion circuit according to any one of the first aspect.

[0025] In a third aspect of the embodiments of the present invention, a main board is provided, and the main board includes the switched resonant tank conversion circuit according to any one of the first aspect;

[0026] The switched resonant tank conversion circuit is used to adjust the output voltage of the power supply terminal in the main board to meet the power supply voltage requirements of the chips in the main board.

[0027] In a fourth aspect of the embodiments of the present invention, an electronic device is provided, and the electronic device includes the switched resonant tank conversion circuit according to any one of the first aspect;

[0028] The switched resonant tank conversion circuit is used to adjust the output voltage of the main board power supply terminal in the electronic device to meet the power supply voltage requirements of the chips in the main board.

[0029] The switched resonant tank conversion circuit provided by the present invention includes: multiple groups of circuit units and multiple transformers. Each group of circuit units can achieve the function of the switched resonant tank conversion circuit when used alone; when multiple groups of circuit units need to be topologically connected in parallel, the multiple groups of circuit units are topologically connected in parallel, and a single transformer is provided between two adjacent parallel-connected groups of circuit units; wherein, the turns ratio of each transformer is 1:1. Moreover, in two adjacent parallel-connected groups of circuit units, the first circuit unit is connected to the first winding of the single transformer, and the second circuit unit in the two adjacent parallel-connected groups of circuit units is connected to the second winding of the single transformer. The first circuit unit does not include a resonant inductor element, and the equivalent inductor of the first winding is used to replace the resonant inductor element. The second circuit unit does not include a resonant inductor element, and the equivalent inductor of the second winding is used to replace the resonant inductor element.

[0030] Since the parallel connection between two parallel circuit units is achieved through a transformer with a turns ratio of 1:1, regardless of whether there are errors in the input voltage of each switching resonant tank conversion circuit, or whether there are differences in the output equivalent impedance of each switching resonant tank conversion circuit, or whether there are errors in the parameters of the resonant components, the output currents of each circuit unit can be made equal through the transformer with a turns ratio of 1:1, achieving the output current balance of each switching resonant tank conversion circuit.

[0031] In addition, since there is no longer a need for a resonant inductor element in each switching resonant tank conversion circuit, but the equivalent inductance of the transformer winding replaces the original resonant inductor, the cost of the switching resonant tank conversion circuit is reduced as a whole. And there is no increase in control logic or control circuit, simplifying the structure of the switching resonant tank conversion circuit. Also, due to the characteristics of simply using passive components, it is not easy to make mistakes. While improving the power cycle and efficiency of the switching resonant tank conversion circuit, the reliability of the switching resonant tank conversion circuit is enhanced. Brief Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 It is a modular schematic diagram of the switching resonant tank conversion circuit according to the embodiment of the present invention;

[0034] Figure 2 It is an exemplary modular connection structure diagram in the embodiment of the present invention;

[0035] Figure 3 It is a schematic structural diagram of the first common switching resonant tank conversion circuit in the embodiment of the present invention;

[0036] Figure 4 It is in the embodiment of the present invention Figure 3 Waveform diagrams of the input voltage and two sets of output currents corresponding to the circuit structure;

[0037] Figure 5 It is a schematic structural diagram of the second common switching resonant tank conversion circuit in the embodiment of the present invention;

[0038] Figure 6 It is in the embodiment of the present invention Figure 5 Waveform diagrams of the input voltage and two sets of output currents corresponding to the circuit structure;

[0039] Figure 7It is a schematic structural diagram of the third common switching resonant tank conversion circuit in the embodiments of the present invention;

[0040] Figure 8 in the embodiments of the present invention Figure 7 Waveform diagrams of the input voltage and two sets of output currents corresponding to the circuit structure;

[0041] Figure 9 It is a schematic structural diagram of the fourth common switching resonant tank conversion circuit in the embodiments of the present invention;

[0042] Figure 10 in the embodiments of the present invention Figure 9 Waveform diagrams of the input voltage and two sets of output currents corresponding to the circuit structure;

[0043] Figure 11 It is a schematic structural diagram of the switching resonant tank conversion circuit in the embodiments of the present invention;

[0044] Figure 12 in the embodiments of the present invention Figure 11 Waveform diagrams of the input voltage and two sets of output currents corresponding to the circuit structure. Specific embodiments

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0046] The inventor found that in the actual application of the switching resonant tank conversion circuit, it may be necessary to use multiple sets of switching resonant tank conversion circuits in parallel. However, when multiple sets of switching resonant tank conversion circuits are used in parallel, due to reasons such as errors in the input voltage of each set of switching resonant tank conversion circuits, differences in the output equivalent impedance of each set of switching resonant tank conversion circuits, or errors in component parameters, the output current values of each set of switching resonant tank conversion circuits are not equal, that is, the output currents of each set of switching resonant tank conversion circuits are unbalanced.

[0047] In view of the above problems, how to balance the output currents of the switching resonant tank conversion circuit in the case of errors in the input voltage of each set of switching resonant tank conversion circuits, differences in the output equivalent impedance of each set of switching resonant tank conversion circuits, or errors in component parameters, etc., the inventor creatively proposed the switching resonant tank conversion circuit of the present invention, and the following is a detailed description of the switching resonant tank conversion circuit of the present invention.

[0048] The switched resonant tank conversion circuit proposed by the present invention includes: multiple groups of circuit units and multiple transformers. Each group of circuit units can achieve the function of the switched resonant tank conversion circuit when used alone; therefore, the way to implement the parallel topology is to achieve the topology through parallel connection between multiple groups of circuit units. In order to achieve the goal that the output current of the switched resonant tank conversion circuit can be balanced under non-perfect ideal conditions, a single transformer is provided between two adjacent parallel-connected groups of circuit units, and the turns ratio of each transformer is 1:1. For example, if there are n groups of circuit units in total, then n - 1 transformers need to be provided between two adjacent parallel-connected groups of circuit units.

[0049] In terms of the specific connection relationship, the first circuit unit in two adjacent parallel-connected groups of circuit units is connected to the first winding of the single transformer. This so-called single transformer refers to the transformer provided between the first circuit unit and the second circuit unit. And the second circuit unit in two adjacent parallel-connected groups of circuit units is connected to the second winding of the single transformer. Since the windings of the transformer can be regarded as inductive components in terms of electrical characteristics, a resonant inductor may not be provided in the first circuit unit, that is, the first circuit unit does not include a resonant inductor component, but the equivalent inductance of the first winding in terms of electrical characteristics is used to replace the resonant inductor component that should be included in the first circuit unit. For the same reason, the second circuit unit also does not include the resonant inductor component that should be provided in it, but the equivalent inductance of the second winding in terms of electrical characteristics is used to replace the resonant inductor component that should be included in the second circuit unit. In this circuit structure, since each circuit unit no longer requires a resonant inductor component, but the equivalent inductance of the winding of the transformer is used to replace the resonant inductor that should be included in each original circuit unit, the cost of the switched resonant tank conversion circuit is reduced as a whole.

[0050] The above structure can be exemplarily understood better by Figure 1 the modular schematic diagram of the switched resonant tank conversion circuit shown in Figure 1 which includes: the first circuit unit, the second circuit unit, the third circuit unit, the nth circuit unit, the input voltage of the first circuit unit, the input voltage of the second circuit unit, the input voltage of the third circuit unit, the input voltage of the nth circuit unit, and n - 1 transformers.

[0051] A single transformer 1 is provided between the first circuit unit and the second circuit unit. The first circuit unit is connected to the first winding of the single transformer, and the second circuit unit is connected to the second winding of the single transformer; a single transformer is provided between the second circuit unit and the third circuit unit. The second circuit unit is connected to the first winding of the single transformer, and the third circuit unit is connected to the second winding of the single transformer. And so on, the (n - 1)th circuit unit ( Figure 1A single transformer is provided between the (not shown in the figure) and the nth circuit unit, and finally a structure of n circuit units and n - 1 transformers is obtained.

[0052] Since parallel connection between multiple groups of circuit units is achieved through a transformer with a turns ratio of 1:1, regardless of whether there are errors in the input voltage of each switching resonant tank conversion circuit, or whether there are differences in the output equivalent impedance of each switching resonant tank conversion circuit, or whether there are errors in the parameters of the resonant components, the output current of each circuit unit can be made equal through a transformer with a turns ratio of 1:1, achieving the balance of the output current of each switching resonant tank conversion circuit.

[0053] In addition, since there is no longer a need for a resonant inductor element in each switching resonant tank conversion circuit, but the equivalent inductance of the winding of the voltage transformer replaces the resonant inductor that should originally be included in terms of electrical characteristics, the cost of the switching resonant tank conversion circuit is reduced as a whole. And there is no increase in control logic or control circuit, simplifying the structure of the switching resonant tank conversion circuit. Also, due to the characteristics of simply using passive components, it is not easy to make mistakes. While improving the power cycle and efficiency of the switching resonant tank conversion circuit, the reliability of the switching resonant tank conversion circuit is improved.

[0054] In a possible embodiment, the transformers provided for adjacent parallel circuit units include: a T_Balance integrated transformer with a turns ratio of 1:1 or a coil transformer with a turns ratio of 1:1. Of course, it can be understood that other structural forms of transformers that can achieve a 1:1 turns ratio can be applied to the switching resonant tank conversion circuit of the present invention.

[0055] Since the output current of each circuit unit is made equal through a transformer with a turns ratio of 1:1, that is, in multiple groups of parallel circuit units, the current value of the output current of each group of circuit units is equal to the current value of the output current of other groups of circuit units. Due to the manufacturing process of the transformer itself, the equivalent inductance of its two windings may be equal or may not be equal in terms of electrical characteristics, which can be regarded as the inductance value of the resonant inductor in each group of circuit units being equal or not equal, but it does not affect the realization of its function.

[0056] By the same principle, in multiple parallel circuit units, the voltage value of the input voltage of each group of circuit units can be equal to or different from that of other groups of circuit units; in multiple parallel circuit units, the impedance value of the output equivalent impedance of each group of circuit units can be equal to or different from that of other groups of circuit units; in multiple parallel circuit units, the parameters of the resonant components used in each group of circuit units can be without error or the error can be within a preset range. It should be noted here that since each group of circuit units no longer contains a resonant inductor component, the resonant component is essentially only a resonant capacitor. No matter which of the above situations occurs, it does not affect the goal of making the output currents of each circuit unit equal through a transformer with a turns ratio of 1:1.

[0057] Taking two adjacent parallel circuit units as an example: In one possible implementation, each group of circuit units includes two switch groups. One end of the first winding of the transformer is connected to the first switch group in the first circuit unit, and the other end of the first winding is connected to the second switch group in the first circuit unit; one end of the second winding is connected to the third switch group in the second circuit unit, and the other end of the second winding is connected to the fourth switch group in the second circuit unit.

[0058] In one possible implementation, the above-mentioned first switch group, second switch group, third switch group, and fourth switch group each include: two field effect transistors connected in series; the first circuit unit further includes: a first resonant capacitor; the second circuit unit further includes: a second resonant capacitor. It should be noted that other components with the same function as the field effect transistor can replace the field effect transistor to achieve the function of the switch group.

[0059] One end of the first resonant capacitor is connected to the connection point of the first switch group, the other end of the first resonant capacitor is connected to one end of the first winding, and the other end of the first winding is connected to the connection point of the second switch group; one end of the second resonant capacitor is connected to the connection point of the third switch group, the other end of the second resonant capacitor is connected to one end of the second winding, and the other end of the second winding is connected to the connection point of the fourth switch group. Here, the so-called connection point of the switch group refers to: the position where the two field effect transistors connected in series in each switch group are connected to each other.

[0060] Take Figure 2 an exemplary modular connection structure diagram shown as an example. Figure 2In the first circuit unit, a path of input voltage is received. In the first circuit unit, the first switch group is two series-connected field effect transistors 1 and 2, the second switch group is two series-connected field effect transistors 3 and 4, and the first resonant capacitor. In the second circuit unit, a path of input voltage is received. In the second circuit unit, the third switch group is two series-connected field effect transistors 5 and 6, the fourth switch group is two series-connected field effect transistors 7 and 8, and the second resonant capacitor.

[0061] One end of the first resonant capacitor is connected to the connection point of field effect transistors 1 and 2, the other end of the first resonant capacitor is connected to one end of the first winding, and the other end of the first winding is connected to the connection point of field effect transistors 3 and 4; One end of the second resonant capacitor is connected to the connection point of field effect transistors 5 and 6, the other end of the second resonant capacitor is connected to one end of the second winding, and the other end of the second winding is connected to the connection point of field effect transistors 7 and 8. Figure 2 For the sake of simplicity of illustration, the structure of the switched resonant tank converter circuit is shown in an exemplary modular structure of two sets of circuit units and a transformer. The modular structure of the remaining n sets of circuit units and n - 1 transformers can be obtained by simple reasoning and will not be elaborated here. Figure 2 It can be obtained by simple reasoning and will not be elaborated here.

[0062] In actual applications, according to its circuit characteristics, the switched resonant tank converter circuit can either boost the input voltage and then output it, or reduce the input voltage and then output it. Therefore, after n sets of circuit units are based on the parallel topology of n - 1 transformers, the input voltage value can be increased to a preset high voltage value and then output; for example, if the input voltage value is 1V and the preset high voltage value is 2 times or 2.5 times or 3 times... of the input voltage value, then after n sets of circuit units are based on the parallel topology of n - 1 transformers, the input voltage value of 1V can be increased to the preset high voltage value of 2V or 2.5V or 3V... and then output.

[0063] Or, after n sets of circuit units are based on the parallel topology of n - 1 transformers, the input voltage value can be reduced to a preset low voltage value and then output. For example, if the input voltage value is 1V and the preset low voltage value is 1 / 2 times or 1 / 2.5 times or 1 / 3 times... of the input voltage value, then after n sets of circuit units are based on the parallel topology of n - 1 transformers, the input voltage value of 1V can be reduced to the preset low voltage value of 0.5V or 0.4V or 0.33V... and then output.

[0064] In order to more clearly illustrate the problems existing in the current conventional switched resonant tank converter circuit and the specific structure of the switched resonant tank converter circuit proposed by the present invention, the following takes the specific circuit structure of a certain conventional switched resonant tank converter circuit as an example for explanation.

[0065] Referring to Figure 3 the structure of the common first switching resonant tank conversion circuit shown Figure 3 For the sake of simplicity of illustration, a parallel structure of two sets of switching resonant tank conversion circuits is exemplarily shown. In practical applications, the parallel connection of more than two sets of switching resonant tank conversion circuits can be obtained by simple structural transformation with reference to Figure 3 In addition Figure 3 only the key components and their connection structures are exemplarily shown, which does not mean that the structure of the switching resonant tank conversion circuit is only realized by the combination of the components shown in the figure

[0066] Figure 3 In one set of the switching resonant tank conversion circuits, the drain of the field effect transistor MOS3 receives the voltage V1 = 48V, and in the other set of the switching resonant tank conversion circuits, the drain of the field effect transistor MOS3 receives the voltage V2 = 48V. The structures of the two sets of switching resonant tank conversion circuits are exactly the same. Taking one set of the switching resonant tank conversion circuits that receives the voltage V1 = 48V as an example, the drain of the field effect transistor MOS3 receives the voltage V1, and the source of the field effect transistor MOS3 is respectively connected to the drain of the field effect transistor MOS1 and the first end of the resonant capacitor C1. The capacitance value of the resonant capacitor C1 is exemplarily defined as 2.82u

[0067] The second end of the resonant capacitor C1 is connected to the first end of the resonant inductor L1, and the inductance value of the resonant inductor L1 is exemplarily defined as 78n. The second end of the resonant inductor L1 is respectively connected to the drain of the field effect transistor MOS5 and the source of the field effect transistor MOS6. The source of the field effect transistor MOS5 is grounded. The drain of the field effect transistor MOS6 is respectively connected to the drain of the field effect transistor MOS10, the source of the field effect transistor MOS1, the first end of the clamping capacitor C3, and the first end of the voltage stabilizing capacitor Cout. The second end of the voltage stabilizing capacitor Cout is grounded, and the second end of the clamping capacitor C3 is connected to the source of the field effect transistor MOS10. The structure of the other set of switching resonant tank conversion circuits is the same and will not be elaborated here. The output ends of the two sets of switching resonant tank conversion circuits are connected in parallel, that is, the first end of the voltage stabilizing capacitor Cout is connected in parallel with the first end of the voltage stabilizing capacitor Cout0 as the final output end of the two sets of switching resonant tank conversion circuits. The gates of all the field effect transistors are controlled by the control signals sent by the control circuit. The control signals can be PWM duty cycle signals or any other signals that can control the on and off states of the field effect transistors. In the figure, a square wave represents the control signal

[0068] I1 represents the output current of this set of switching resonant tank conversion circuits, which is measured by the ammeter A. Vout represents the output voltage after the parallel connection of the two sets of switching resonant tank conversion circuits, which is measured by the voltmeter V. Iout represents the output current after the parallel connection of the two sets of switching resonant tank conversion circuits. Through calculation, it can be obtained that the output current after the parallel connection of the two sets of switching resonant tank conversion circuits is 50A

[0069] Figure 3 Since the input voltages of the two groups of switch resonant tank conversion circuits are both equal to 48V, the capacitance values of the resonant capacitors are both equal to 2.82u, the inductance values of the resonant inductors are both equal to 78n, the capacitance values of the remaining clamping capacitors and voltage stabilizing capacitors are also equal, and the output impedances of each group of switch resonant tank conversion circuits are equal, the calculated output current value of each group of switch resonant tank conversion circuits is 25A through operation, that is, I1 = I2 = 25A. The output current values of the two groups of switch resonant tank conversion circuits are the same, and the current sharing degree is quite good, that is, the balance degree is quite good.

[0070] Figure 4 For Figure 3 the waveforms of the input voltage and the two groups of output currents corresponding to the circuit structure. The waveform diagram at the top is the waveform diagram of the output voltage value Vout after the two groups of switch resonant tank conversion circuits are connected in parallel. It can be seen that the output voltage value Vout is stable at about 24V, and the fluctuation is less than plus or minus 0.04V. The output current value I1 ( Figure 4 in the middle waveform diagram) of one group of switch resonant tank conversion circuits is 25A without fluctuation, and the output current value I2 ( Figure 4 in the bottom waveform diagram) of the other group of switch resonant tank conversion circuits is also 25A without fluctuation.

[0071] It can be seen from this that when the input voltages are equal, the output impedances are equal, and the parameters of the resonant components (generally referring to the resonant capacitor and the resonant inductor) are equal, the output currents of the two groups of switch resonant tank conversion circuits are balanced.

[0072] However, in actual applications, the conditions of equal input voltages, equal output impedances, and equal parameters of the resonant components are perfect ideal conditions, and these conditions may not necessarily be achieved. For example, the input voltages may not be equal, or the output impedances may not be equal, or the parameters of the resonant components may not be equal.

[0073] Take Figure 5 the structure of the common second type of switch resonant tank conversion circuit shown as an example. Figure 5 The circuit structure is the same as Figure 3 and will not be elaborated here. And Figure 5 in it, the input voltages of the two groups of switch resonant tank conversion circuits are not equal. The input voltage of one group of switch resonant tank conversion circuits is V1 = 50.4V, and the input voltage of the other group of switch resonant tank conversion circuits is V2 = 45.6V. The remaining conditions: the output impedances are equal, and the parameters of the resonant components are equal. However, the output currents of the two groups of switch resonant tank conversion circuits are not equal, and the current oscillation is severe.

[0074] Figure 6 For Figure 5Waveform diagrams of the input voltage corresponding to the circuit structure and two sets of output currents. The waveform diagram at the top shows the waveform of the output voltage value Vout after the parallel connection of two sets of switched resonant tank conversion circuits. It can be seen that the output voltage value Vout is stable between 22.9V and 23V, with a fluctuation less than ±0.01V. However, the output current value I1 ( Figure 6 the middle waveform diagram) of the switched resonant tank conversion circuit with an input voltage V1 = 50.4V oscillates violently between -30A and 180A, with a strong fluctuation. The output current value I2 ( Figure 6 the bottom waveform diagram) of the switched resonant tank conversion circuit with an input voltage V2 = 45.6V oscillates violently between 80A and -130A, with a strong fluctuation.

[0075] It can be seen that when the input voltages are not equal, but the output impedances are equal and the parameters of the resonant components are equal, the output currents of the two sets of switched resonant tank conversion circuits are seriously unbalanced, with a huge gap, and the current fluctuations of each are strong.

[0076] Take Figure 7 the structure of the common third type of switched resonant tank conversion circuit shown as an example. Figure 7 The circuit structure in Figure 3 is the same as that in Figure 5 and will not be elaborated here. However, Figure 7 the output impedances of the two sets of switched resonant tank conversion circuits in

[0077] Figure 8 are not equal. The output impedance of one set of switched resonant tank conversion circuits is R1 = 1mΩ, and the input-output impedance of the other set of switched resonant tank conversion circuits is R2 = 10mΩ. The remaining conditions: the input voltages are equal, and the parameters of the resonant components are equal. However, the output currents of the two sets of switched resonant tank conversion circuits are not equal, and the current oscillations are relatively large, and the oscillation of the output voltage Vout of the entire circuit is relatively large. Figure 7 Waveform diagrams of the input voltage corresponding to the circuit structure and two sets of output currents. The waveform diagram at the top shows the waveform of the output voltage value Vout after the parallel connection of two sets of switched resonant tank conversion circuits. It can be seen that the output voltage value Vout oscillates between 23.85V and 23.91V. The output current value I1 ( Figure 8 the middle waveform diagram) of the switched resonant tank conversion circuit with an output impedance R1 = 1mΩ oscillates between 39A and 41.5A, with a relatively large fluctuation. The output current value I2 ( Figure 8 the bottom waveform diagram) of the switched resonant tank conversion circuit with an output impedance R2 = 10mΩ oscillates between 8.5A and -10.5A, with a relatively large fluctuation.

[0078] It can be seen that when the output impedances are not equal, but the input voltages are equal and the parameters of the resonant components are equal, there is a large imbalance in the output currents of the two groups of switched resonant tank conversion circuits, with a large difference and significant fluctuations for each. Compared with the case where the input voltages are not equal, the inequality of the output impedances also leads to an imbalance in the output currents of the two groups of switched resonant tank conversion circuits, but the current difference is relatively small and the fluctuations are relatively small.

[0079] Take Figure 9 the structure of the common fourth switched resonant tank conversion circuit shown as an example. Figure 9 The circuit structure in Figure 3 is the same as that in Figure 5 and Figure 7 and will not be elaborated further. However, Figure 9 the parameters of the resonant components of the two groups of switched resonant tank conversion circuits in Figure 9 are not equal. For one group of switched resonant tank conversion circuits, the capacitance value of the resonant capacitor C1 is no longer 2.82u but becomes 3.1u, and the inductance value of the resonant inductor L1 is no longer 78n but becomes 85.8n, which all meet the error requirements generated during the manufacturing of capacitors and inductors; for the other group of switched resonant tank conversion circuits, the capacitance value of the resonant capacitor C2 is no longer 2.82u but becomes 2.54u, and the inductance value of the resonant inductor L2 is no longer 78n but becomes 70.2n, which also meet the error requirements generated during the manufacturing of capacitors and inductors. The remaining conditions are: equal input voltages and equal output impedances. However, the output currents of the two groups of switched resonant tank conversion circuits are not equal, and the current oscillations are significant.

[0080] Figure 10 For Figure 9 the circuit structure, the waveform diagrams of the input voltage and the two groups of output currents are shown. The waveform diagram at the top is the waveform diagram of the output voltage value Vout after the parallel connection of the two groups of switched resonant tank conversion circuits. It can be seen that the output voltage value Vout oscillates between 23.75V and 23.8V. The output current value I1 of the switched resonant tank conversion circuit with a resonant capacitor C1 capacitance value of 3.1u and a resonant inductor L1 inductance value of 85.8n ( Figure 10 the middle waveform diagram in Figure 10 ) oscillates between 25A and 38A, with large fluctuations; the output current value I2 of the switched resonant tank conversion circuit with a resonant capacitor C2 capacitance value of 2.54u and a resonant inductor L2 inductance value of 70.2n ( Figure 10 the bottom waveform diagram in Figure 10 ) oscillates between 12A and -25A, with large fluctuations.

[0081] It can be seen from this that when the parameters of the resonant components are not equal, but the input voltages are equal and the output impedances are equal, there is a large imbalance in the output currents of the two groups of switched resonant tank conversion circuits, with a large gap and significant fluctuations in each. Compared with the case where the input voltages are not equal, when the parameters of the resonant components are not equal, it also leads to an imbalance in the output currents of the two groups of switched resonant tank conversion circuits, but the current gap is relatively small and the fluctuations are relatively small.

[0082] Based on the above Figures 3 to 10 structure and the corresponding explanatory content, it can be clearly understood that for the current parallel use of switched resonant tank conversion circuits, only under perfect ideal conditions: equal input voltages, equal output impedances, and equal parameters of the resonant components, can the output currents of the two groups of switched resonant tank conversion circuits be balanced. As long as any one of the conditions is not met, such as unequal input voltages, or unequal output impedances, or unequal parameters of the resonant components, the output currents of the two groups of switched resonant tank conversion circuits cannot be balanced, and the fluctuations in their respective output currents are large or even severe. This obviously cannot meet the daily use conditions.

[0083] The structure of the switched resonant tank conversion circuit proposed in the present invention is as Figure 11 shown, Figure 11 The circuit structure in Figure 3 , Figure 5 , Figure 7 , Figure 9 is similar. The difference is that the two original resonant inductors L1 and L2 are omitted, and a transformer with a turns ratio of 1:1 is set in the two groups of switched resonant tank conversion circuits. Based on the equivalent inductances Lk1 and Lk2 of the two windings N1 and N2 of the transformer in electrical characteristics, the two original resonant inductors L1 and L2 are replaced. It should be noted that Figure 11 the equivalent inductances Lk1 and Lk2 in Figure 11 are essentially the equivalent inductances corresponding to the windings N1 and N2, and do not represent physically existing components.

[0084] Figure 11 In , the field effect transistors MOS1 and MOS3 are equivalent to the first switch group. The drain of the field effect transistor MOS3 receives the input voltage V1 of 50.4V. The field effect transistors MOS5 and MOS6 are equivalent to the second switch group. The first end of the first resonant capacitor C1 is respectively connected to the drain of the field effect transistor MOS1 and the source of the field effect transistor MOS3. The second end of the first resonant capacitor C1 is connected to one end of the first winding N1 of the transformer. The other end of the first winding N1 is respectively connected to the drain of the field effect transistor MOS5 and the source of the field effect transistor MOS6.

[0085] The field-effect transistors MOS2 and MOS4 are equivalent to the third switch group. The drain of the field-effect transistor MOS4 receives an input voltage V2 of 45.6V. The field-effect transistors MOS8 and MOS9 are equivalent to the fourth switch group. The first end of the second resonant capacitor C2 is respectively connected to the drain of the field-effect transistor MOS2 and the source of the field-effect transistor MOS4. The second end of the second resonant capacitor C2 is connected to one end of the second winding N2 in the transformer. The other end of the second winding N2 in the transformer is respectively connected to the drain of the field-effect transistor MOS8 and the source of the field-effect transistor MOS9. The remaining connection structures are the same as those in Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 and will not be elaborated here.

[0086] Figure 11 In Figure 11 and

[0087] Figure 12 , the parameters of the resonant capacitors C1 and C2 of the two groups of switch-resonant tank conversion circuits are not equal: C1 = 3.1u, C2 = 2.54u; the equivalent inductances Lk1 and Lk2 of the two windings of the transformer in electrical characteristics are not equal: Lk1 = 85.8n, Lk2 = 75.2n, which means the inductance values of the resonant inductors in each group of switch-resonant tank conversion circuits are not equal; the output impedances of the two groups of switch-resonant tank conversion circuits are not equal: R1 = 10mΩ, R2 = 100mΩ; the input voltages of the two groups of switch-resonant tank conversion circuits are not equal: V1 = 50.4V, V2 = 45.6V. That is Figure 11 a relatively extreme situation where the input voltages are not equal, the output impedances are not equal, and the parameters of the resonant components are not equal is simulated. However, the output currents of the two groups of switch-resonant tank conversion circuits are equal, and the current is stable without oscillation fluctuations. Figure 12 in the middle waveform diagram in Figure 12 is stable at 25A without fluctuations; the output current value I2 of the switch-resonant tank conversion circuit with a capacitance value of 2.54u for the resonant capacitor C2, an inductance value of 75.2n for the equivalent inductance Lk2, an impedance value of 100mΩ for the output impedance R2, and a voltage value of 45.6V for the input voltage V2 (

[0088] It can be seen from this that the switched resonant tank conversion circuit proposed by the present invention, under non-ideal conditions: for example, the parameters of the resonant components, the input voltage, and the output impedance are not equal, or one of the conditions of the parameters of the resonant components, the input voltage, and the output impedance is not equal, or two of the conditions of the parameters of the resonant components, the input voltage, and the output impedance are not equal, can achieve the output current balance of two sets of switched resonant tank conversion circuits. And the output current of each is stable without fluctuation, and the output voltage of the entire circuit is basically stable. It well solves the problems existing when the target conventional switched resonant tank conversion circuits are used in parallel.

[0089] Based on the above switched resonant tank conversion circuit, an embodiment of the present invention further proposes a chip, and the power supply structure of the chip adopts the switched resonant tank conversion circuit described in any one of the above.

[0090] Based on the above switched resonant tank conversion circuit, an embodiment of the present invention further proposes a main board, and the main board includes the switched resonant tank conversion circuit described in any one of the above;

[0091] The switched resonant tank conversion circuit is used to adjust the output voltage of the power supply terminal in the main board to meet the power supply requirements of the chips in the main board.

[0092] Based on the above switched resonant tank conversion circuit, an embodiment of the present invention further proposes an electronic device, and the electronic device includes the switched resonant tank conversion circuit described in any one of the above;

[0093] The switched resonant tank conversion circuit is used to adjust the output voltage of the main board power supply terminal in the electronic device to meet the power supply requirements of the chips in the main board.

[0094] Through the above examples, the switched resonant tank conversion circuit provided by the present invention includes: multiple groups of circuit units and multiple transformers. Each group of circuit units can achieve the function of the switched resonant tank conversion circuit when used alone; when multiple groups of circuit units need to be topologically connected in parallel, the multiple groups of circuit units are topologically connected in parallel, and between two adjacent parallel-connected groups of circuit units, a single transformer is provided; wherein, the turns ratio of each transformer is 1:1. Moreover, in two adjacent parallel-connected groups of circuit units, the first circuit unit is connected to the first winding of the target transformer, and the second circuit unit in the two adjacent parallel-connected groups of circuit units is connected to the second winding of the target transformer. The first circuit unit does not include a resonant inductor element, and the equivalent inductor of the first winding in terms of electrical characteristics is used to replace the original resonant inductor element that should be in the first circuit unit. The second circuit unit does not include a resonant inductor element, and the equivalent inductor of the second winding in terms of electrical characteristics is used to replace the original resonant inductor element that should be in the second circuit unit.

[0095] Since the parallel connection between two parallel circuit units is achieved through a transformer with a turns ratio of 1:1, regardless of whether there are errors in the input voltage of each switch resonant tank conversion circuit, or whether there are differences in the output equivalent impedance of each switch resonant tank conversion circuit, or whether there are errors in the parameters of the resonant components, the output currents of each circuit unit can be made equal through the transformer with a turns ratio of 1:1, achieving the output current balance of each switch resonant tank conversion circuit.

[0096] In addition, since there is no longer a need for a resonant inductor element in each switch resonant tank conversion circuit, but the equivalent inductance of the transformer winding in terms of electrical characteristics replaces the original resonant inductor, the cost of the switch resonant tank conversion circuit is reduced as a whole. And there is no increase in control logic or control circuit, simplifying the structure of the switch resonant tank conversion circuit. Moreover, due to the characteristics of simply using passive components, it is not easy to make mistakes. While improving the power cycle and efficiency of the switch resonant tank conversion circuit, the reliability of the switch resonant tank conversion circuit is improved.

[0097] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0098] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A switched resonant tank conversion circuit, characterized in that The switching resonant tank conversion circuit includes: multiple groups of circuit units and multiple transformers. Each group of circuit units can achieve the functions of the switching resonant tank conversion circuit when used alone; Among multiple groups of the circuit units, the topology is realized in a parallel connection manner; Between two adjacent parallel-connected groups of circuit units, a single transformer is provided; Among them, the turns ratio of each transformer is 1:1; In the two adjacent parallel-connected groups of circuit units, the first circuit unit is connected to the first winding of the single transformer, and the second circuit unit in the two adjacent parallel-connected groups of circuit units is connected to the second winding of the single transformer; One end of the first winding is connected to the first switch group in the first circuit unit, and the other end of the first winding is connected to the second switch group in the first circuit unit; One end of the second winding is connected to the third switch group in the second circuit unit, and the other end of the second winding is connected to the fourth switch group in the second circuit unit; The first switch group, the second switch group, the third switch group, and the fourth switch group each include: two series-connected field effect transistors; the first circuit unit further includes: a first resonant capacitor; the second circuit unit further includes: a second resonant capacitor; One end of the first resonant capacitor is connected to the connection point of the first switch group, the other end of the first resonant capacitor is connected to one end of the first winding, and the other end of the first winding is connected to the connection point of the second switch group; One end of the second resonant capacitor is connected to the connection point of the third switch group, the other end of the second resonant capacitor is connected to one end of the second winding, and the other end of the second winding is connected to the connection point of the fourth switch group. The connection point is the position where two series-connected field effect transistors in each switch group are connected to each other.

2. The switched resonant tank conversion circuit according to claim 1, wherein The single transformer includes: a T_Balance integrated transformer with a turns ratio of 1:1 or a coil-type transformer with a turns ratio of 1:

1.

3. The switched resonant tank conversion circuit according to claim 1, wherein, In each transformer, the inductance values of the equivalent inductances of the two windings are equal or not equal; Among multiple groups of parallel-connected circuit units, the voltage value of the input voltage of each group of circuit units is equal or not equal to the voltage value of the input voltage of other groups of circuit units; Among multiple groups of parallel-connected circuit units, the impedance value of the output equivalent impedance of each group of circuit units is equal or not equal to the impedance value of the output equivalent impedance of other groups of circuit units; Among multiple groups of parallel-connected circuit units, the parameters of the resonant components used in each group of circuit units have no error or the error is within a preset range compared with the parameters of the resonant components used in other groups of circuit units.

4. The switched resonant tank conversion circuit according to claim 1, wherein, Among multiple groups of parallel-connected circuit units, the current value of the output current of each group of circuit units is equal to the current value of the output current of other groups of circuit units.

5. The switching resonant tank conversion circuit according to claim 1, wherein After n groups of the circuit units are topologically connected in parallel based on n - 1 transformers, the input voltage value is increased to a preset high voltage value and then output; or, After n groups of the circuit units are topologically connected in parallel based on n - 1 transformers, the input voltage value is reduced to a preset low voltage value and then output.

6. A chip, characterized in that, The power supply structure of the chip adopts the switching resonant tank conversion circuit as described in any one of claims 1 - 5.

7. A main board, characterized in that, The main board includes the switched resonant tank conversion circuit as described in any one of claims 1-5; The switched resonant tank conversion circuit is used to adjust the output voltage of the power supply terminal in the main board to meet the power supply voltage requirements of the chips in the main board.

8. An electronic device, characterized in that, The electronic device includes the switched resonant tank conversion circuit as described in any one of claims 1-5; The switched resonant tank conversion circuit is used to adjust the output voltage of the main board power supply terminal in the electronic device to meet the power supply voltage requirements of the chips in the main board.

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