Power supply and current sampling method

Abstract

This application provides a power supply and a current sampling method. The power supply includes an input power source, a multiphase interleaved parallel converter, and a current sampling device. The input power source supplies power to the input terminal of the multiphase interleaved parallel converter, which includes at least two phases connected in parallel. The current sampling device is connected to the switching transistors of each phase converter in the at least two phases connected in parallel. The current sampling device includes a first sampling resistor connected to either the input or output terminal of the multiphase interleaved parallel converter. The at least two phases connected in parallel include a first phase converter. The current sampling device determines the inductor current of the first phase converter based on the first current collected by the first sampling resistor at a first moment. At the first moment, the operating circuit of the first phase converter passes through the first sampling resistor. Using this application can reduce the circuit cost of the current sampling device and improve its applicability.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a power supply and current sampling method. Background Technology

[0002] Multiphase interleaved parallel converters have broad application prospects due to their advantages such as high efficiency, small size, high power density, and low cost. In existing technologies, the current of each phase converter connected in series with the primary winding of the current transformer is collected separately using current transformers. This current is then processed to obtain the inductor current of each phase converter in a two-phase interleaved parallel converter. However, this approach uses relatively large current transformers and can only sample AC current, resulting in high circuit cost and poor applicability. Summary of the Invention

[0003] This application provides a power supply and current sampling method, which can determine the inductor current of each phase converter based on the current of the first sampling resistor connected to the input or output terminal of the multi-phase interleaved parallel converter at a specific time. The circuit has low cost and strong applicability.

[0004] In a first aspect, this application provides a power supply including an input power supply, a multiphase interleaved parallel converter, and a current sampling device. The input power supply supplies power to the input terminal of the multiphase interleaved parallel converter, which includes at least two phases connected in parallel. The current sampling device is connected to the switching transistors of each phase converter in the at least two phases connected in parallel. The current sampling device includes a first sampling resistor connected to either the input or output terminal of the multiphase interleaved parallel converter. The at least two phases connected in parallel include a first phase converter. The current sampling device collects a first current from the first sampling resistor at a first moment and determines the inductor current of the first phase converter based on the first current from the first sampling resistor at the first moment. The operating circuit of the first phase converter passes through the first sampling resistor at the first moment.

[0005] In this embodiment, the current sampling device determines the inductor current of the first phase converter based on the current of the first sampling resistor connected to the input or output terminal of the multiphase interleaved parallel converter at the first moment. This reduces the circuit cost of the current sampling device, increases support for DC current sampling of the multiphase interleaved parallel converter, and has strong applicability.

[0006] In conjunction with the first aspect, in a first possible implementation, the current sampling device determines the first current of the first sampling resistor at the first moment as the inductor current of the first phase converter when it determines that only the working circuit of the first phase converter passes through the first sampling resistor at the first moment.

[0007] In conjunction with the first aspect, in a second possible implementation, when the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter and the second sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, the current sampling device, upon determining that the operating circuits of all converters pass through the first sampling resistor at the first moment, and that the operating circuits of other converters except the first phase converter pass through the second sampling resistor, collects the second current of the second sampling resistor at the first moment, and determines the difference between the first current of the first sampling resistor at the first moment and the second current of the second sampling resistor at the first moment as the inductor current of the first phase converter.

[0008] In this embodiment of the application, when the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, the second sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, and the currents on the first sampling resistor and the second sampling resistor at the first moment are not just the operating current of the first phase converter, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor and the current of the second sampling resistor at the first moment.

[0009] In conjunction with the first aspect, in a third possible implementation, when the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter and the second sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, the current sampling device, upon determining that the operating circuits of all converters pass through the first sampling resistor at the first moment, and that the operating circuits of other converters besides the first phase converter pass through the second sampling resistor, collects the second current of the second sampling resistor at the first moment, and determines the difference between the first current of the first sampling resistor at the first moment and the second current of the second sampling resistor at the first moment as the inductor current of the first phase converter.

[0010] In this embodiment of the application, when the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, the second sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, and the current on the first sampling resistor and the second sampling resistor at the first moment is not just the operating current of the first phase converter, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor at the first moment and the current of the second sampling resistor at the first moment.

[0011] In conjunction with the first aspect, in the fourth possible implementation, the current sampling device, after determining that the working circuits of all converters at the first moment pass through the first sampling resistor, samples the second current of the first sampling resistor at the second moment, and determines the difference between the first current of the first sampling resistor at the first moment and the second current of the first sampling resistor at the second moment as the inductor current of the first phase converter. In the second moment, the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of other converters in the multi-phase interleaved parallel converter all pass through the first sampling resistor.

[0012] In this embodiment of the application, when not only the working circuit of the first phase converter passes through the first sampling resistor at the first moment, but also the working circuits of other converters pass through the first sampling resistor, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor at the first moment and the current of the first sampling resistor at the second moment.

[0013] In conjunction with the first aspect, in the fifth possible implementation, the current sampling device acquires the inductor current of each phase converter in the multiphase interleaved parallel converter, and controls the on or off duration of the switching transistors of each phase converter based on the inductor current of each phase converter.

[0014] In this embodiment of the application, after acquiring the inductor current of each phase converter, the current sampling device can calculate the average value of the inductor current of all converters, and use the average value as the target inductor current to adjust the on or off time of the switching transistor of each phase converter, so as to achieve the same inductor current of each phase converter.

[0015] In conjunction with the first aspect, in the sixth possible implementation, the current sampling device determines the circuit state value of the first phase converter based on the inductor current of the first phase converter, and controls the on or off duration of the switching transistor of the first phase converter based on the circuit state value of the first phase converter.

[0016] In this embodiment, the current sampling device can calculate the circuit state value of the first phase converter based on the inductor current of the first phase converter. Here, the circuit state value may include the input current value, the output current value, the input power value, or the output power value. When the circuit state value of the first phase converter is greater than or equal to the preset circuit state value, the first phase converter can be stopped from working by controlling the duration of the switching transistor of the first phase converter being turned on or off, thereby realizing circuit protection for the first phase converter.

[0017] In conjunction with the first aspect, in the seventh possible implementation, the current sampling device includes a sampling module and a processing module, wherein the sampling module collects the first current of the first sampling resistor, the processing module obtains the first current of the first sampling resistor at a first moment, and determines the inductor current of the first phase converter based on the first current of the first sampling resistor at the first moment.

[0018] In conjunction with the first aspect, in any possible implementation, the first phase converter can be an H-bridge converter, a Buck converter, a Boost converter, or a Buck-Boost converter.

[0019] Secondly, this application provides a current sampling method applicable to a power supply. The power supply includes an input power supply, a multiphase interleaved parallel converter, and a current sampling device. The input power supply supplies power to the input terminal of the multiphase interleaved parallel converter. The multiphase interleaved parallel converter includes at least two phases connected in parallel. The current sampling device is connected to the switching transistors of each phase converter in the at least two phases connected in parallel. The current sampling device includes a first sampling resistor connected to either the input or output terminal of the multiphase interleaved parallel converter. The at least two phases connected in parallel include a first phase converter. In this method, the current sampling device acquires the first current of the first sampling resistor at the first moment when the working circuit of the first phase converter passes through the first sampling resistor, and determines the inductor current of the first phase converter based on the first current of the first sampling resistor.

[0020] In this embodiment, the current sampling device determines the inductor current of the first phase converter based on the current of the first sampling resistor connected to the input or output terminal of the multiphase interleaved parallel converter at the first moment. This reduces the circuit cost of the current sampling device, increases support for DC current sampling of the multiphase interleaved parallel converter, and has strong applicability.

[0021] In conjunction with the second aspect, in the first possible implementation, if the current sampling device determines at the first moment that only the working circuit of the first phase converter passes through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter.

[0022] In conjunction with the second aspect, in a second possible implementation, when the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter and the second sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, the current sampling device collects the first current of the first sampling resistor and the second current of the second sampling resistor at the first moment, and determines the difference between the first current of the first sampling resistor and the second current of the second sampling resistor as the inductor current of the first phase converter. In this case, at the first moment, the operating circuits of all converters pass through the first sampling resistor, and the operating circuits of other converters except the first phase converter pass through the second sampling resistor.

[0023] In this embodiment of the application, when the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, the second sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, and the currents on the first sampling resistor and the second sampling resistor at the first moment are not just the operating current of the first phase converter, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor and the current of the second sampling resistor at the first moment.

[0024] In conjunction with the second aspect, in a third possible implementation, when the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter and the second sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, the current sampling device collects the first current of the first sampling resistor and the second current of the second sampling resistor at the first moment, and determines the difference between the first current of the first sampling resistor and the second current of the second sampling resistor as the inductor current of the first phase converter. In this case, at the first moment, the operating circuits of all converters pass through the first sampling resistor, and the operating circuits of other converters except the first phase converter pass through the second sampling resistor.

[0025] In this embodiment of the application, when the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter, the second sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter, and the currents on the first sampling resistor and the second sampling resistor at the first moment are not just the operating current of the first phase converter, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor and the current of the second sampling resistor at the first moment.

[0026] In conjunction with the second aspect, in the fourth possible implementation, the current sampling device collects the first current of the first sampling resistor at a first moment, collects the second current of the first sampling resistor at a second moment, and determines the difference between the first current and the second current of the first sampling resistor as the inductor current of the first phase converter. In the first moment, the working circuits of all converters pass through the first sampling resistor, and in the second moment, the working circuits of the first phase converter do not pass through the first sampling resistor, while the working circuits of other converters pass through the first sampling resistor.

[0027] In this embodiment of the application, when not only the working circuit of the first phase converter passes through the first sampling resistor at the first moment, but also the working circuits of other converters pass through the first sampling resistor, the current sampling device determines the inductor current of the first phase converter based on the difference between the current of the first sampling resistor at the first moment and the current of the first sampling resistor at the second moment.

[0028] In conjunction with the second aspect, in the fifth possible implementation, the current sampling device acquires the inductor current of each phase converter in the multiphase interleaved parallel converter, and controls the on or off duration of the switching transistors of each phase converter based on the inductor current of each phase converter.

[0029] In this embodiment of the application, after acquiring the inductor current of each phase converter, the current sampling device can calculate the average value of the inductor current of all converters, and use the average value as the target inductor current to adjust the on or off time of the switching transistor of each phase converter, so as to achieve the same inductor current of each phase converter.

[0030] In conjunction with the second aspect, in the sixth possible implementation, the current sampling device determines the circuit state value of the first phase converter based on the inductor current of the first phase converter, and controls the on or off duration of the switching transistor of the first phase converter based on the circuit state value of the first phase converter.

[0031] In this embodiment, the current sampling device can calculate the circuit state value of the first phase converter based on the inductor current of the first phase converter. If the circuit state value of the first phase converter is greater than or equal to the preset circuit state value, the first phase converter can be stopped from working by controlling the on or off duration of the switching transistor of the first phase converter, thereby realizing circuit protection of the first phase converter.

[0032] In conjunction with the second aspect, in any possible implementation, the first phase converter can be an H-bridge converter, a Buck converter, a Boost converter, or a Buck-Boost converter.

[0033] In this application, the inductor current of each phase converter can be determined by the current of the first sampling resistor connected to the input or output terminal of the multiphase interleaved parallel converter at a specific time. The current sampling device has low circuit cost and strong applicability. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the power supply provided in this application;

[0035] Figure 2a This is a schematic diagram of the power supply structure of the power supply using a two-phase interleaved parallel H-bridge converter provided in this application;

[0036] Figure 2b This is a schematic diagram of the power supply structure provided in this application, which uses a two-phase interleaved parallel Buck converter;

[0037] Figure 2c This is a schematic diagram of the power supply structure provided in this application, which uses a two-phase interleaved parallel Boost converter;

[0038] Figure 3 This is a schematic diagram of the power supply structure provided in this application, which uses a two-phase interleaved parallel Buck-Boost converter;

[0039] Figure 4a This is a schematic diagram of the power supply structure provided in this application, which uses a three-phase interleaved parallel H-bridge converter;

[0040] Figure 4b This is a schematic diagram of the power supply structure provided in this application, which uses a three-phase interleaved parallel Buck converter;

[0041] Figure 4c This is a schematic diagram of the power supply structure provided in this application, which uses a three-phase interleaved parallel Boost converter.

[0042] Figure 5 This is a schematic diagram of the power supply structure provided in this application, which uses a three-phase interleaved parallel Buck-Boost converter. Detailed Implementation

[0043] The current sampling device in the power supply provided in this application can also be called the inductor current sampling device of a multiphase interleaved parallel converter. This multiphase interleaved parallel converter current sampling device is applicable to various fields of power conversion, such as new energy electric vehicles (e.g., in the forward process, the multiphase interleaved parallel converter supplies the load motor with energy after the battery is converted into electricity, and in the reverse process, it charges the battery), photovoltaic power generation (e.g., when the light intensity is sufficient, the multiphase interleaved parallel converter stores the excess electrical energy generated by the solar panel by charging the battery), and energy storage systems. The specific application scenario can be determined according to the actual application scenario, and there are no restrictions here.

[0044] Multiphase interleaved parallel converters have broad application prospects due to their advantages such as high efficiency, small size, high power density, and low cost. For non-isolated power supply topologies, the power inductor is the core component for power conversion. Therefore, obtaining the inductor current of each phase converter in a multiphase interleaved parallel converter is crucial for power conversion.

[0045] See Figure 1 , Figure 1 This is a schematic diagram of the power supply provided in this application. Figure 1As shown, the power supply includes a DC input power supply Vin, a multiphase interleaved parallel converter, and a current sampling device. The two ends of the DC input power supply Vin are connected to the first input terminal in1 and the second input terminal in2 of the multiphase interleaved parallel converter, respectively, to supply power to the converter. The multiphase interleaved parallel converter includes phase converters 1 to n, where n is an integer greater than or equal to 2. Phase converters 1 to n are connected in parallel through the first input terminal in1, the second input terminal in2, the first output terminal out1, and the second output terminal out2. The first output terminal out1 and the second output terminal out2 are connected to the load. Furthermore, the current sampling device is connected to the switching transistors of each phase converter in the multiphase interleaved parallel converter to control the on / off time of each phase converter's switching transistors, thereby controlling the operating state of each phase converter. The current sampling device includes a first sampling resistor, which is connected to either the input or output terminal of the multiphase interleaved parallel converter. The first sampling resistor can be R1 or R2, such as... Figure 1 As shown, R1 is located between in2 and Vin, and R2 is located between out2 and the load. In other alternative embodiments, R1 can also be located between in1 and Vin, and R2 can also be located between out1 and the load.

[0046] Optional, such as Figure 1 As shown, capacitor C1 can also be connected in parallel between in1 and in2 to filter out noise components of the power supply and smooth pulsating DC voltage, and capacitor C2 can be connected in parallel between out1 and out2 to filter out noise components in the current and make the voltage across the load more stable.

[0047] The current sampling device can determine the inductor current of each phase converter based on the current of the first sampling resistor at a specific moment. The current sampling device may include a sampling module 11 and a processing module 12. The sampling module 11 is connected to both ends of the first sampling resistor. Specifically, the sampling module 11 can be an independent analog-to-digital converter (ADC) or an ADC module built into a microcontroller unit (MCU).

[0048] Optional, such as Figure 1 As shown, a signal conditioning circuit 10 can also be added before the sampling module 11 to amplify the current of the first sampling resistor before supplying it to the sampling module 11, thereby improving the resolution. In a specific implementation, the signal conditioning circuit 10 can be an operational amplifier or other amplification circuit.

[0049] In one possible implementation, the sampling module 11 is used to continuously send the current of the first sampling resistor to the processing module 12. The processing module 12 is used to output control signals (such as PWM waves) to the switching transistors of each phase converter to control the operating state of each phase converter, and to obtain the current of the first sampling resistor at a first moment from the current of the first sampling resistor sent by the sampling module 11. The inductor current of the first phase converter is determined according to the current of the first sampling resistor at the first moment, wherein the working circuit of the first phase converter passes through the first sampling resistor at the first moment.

[0050] In another possible implementation, the processing module 12 outputs control signals to the switching transistors of each phase converter to control the operating state of each phase converter, and sends sampling control signals to the sampling module 11. The sampling module 11 collects the current of the first sampling resistor at the first moment according to the received sampling control signals, and returns the collected current of the first sampling resistor at the first moment to the processing module 12. The processing module 12 determines the inductor current of the first phase converter according to the current of the first sampling resistor at the first moment, wherein the working circuit of the first phase converter passes through the first sampling resistor at the first moment.

[0051] The first time point can be a specific time within the conduction or turn-off period of the controllable switch Q1 in the first phase converter, such as the midpoint time or the middle time. The midpoint time can be the middle of the aforementioned period. For example, if the conduction period of controllable switch Q1 and the turn-off period of controllable switch Q2 in the first phase converter both start from 9:10:00 and end at 9:10:20, then the midpoint time is 9:10:10. The middle time can be the time when the inductor current value during the aforementioned period is (I... Lmax +I Lmin The time corresponding to ) / 2, where I Lmax and I Lmin These represent the maximum and minimum inductor currents during the aforementioned periods, respectively. For example, if there is only one midpoint during the aforementioned period, and if I... Lmax The corresponding time is 9:10:20, I Lmin The corresponding time is 9:10:40, (I) Lmax +I Lmin Since the time corresponding to ) / 2 is 9:10:25, the median time is 9:10:25. In subsequent embodiments, this application uses the first time as the midpoint of the conduction period of the controllable switch in the first phase converter for illustrative purposes.

[0052] based on Figure 1In addition to the power supply shown, this application also provides a current sampling method. In this method, the processing module 12 obtains the first current of the first sampling resistor at the first moment when the working circuit of the first phase converter passes through the first sampling resistor, and determines the inductor current of the first phase converter based on the first current of the first sampling resistor.

[0053] For example, if only the working circuit of the first phase converter passes through the first sampling resistor, a switch in the first phase converter is in the conducting state, and the inductor in the first phase converter is in the charging state. During this period, the current of the first sampling resistor obtained by the processing module 12 is the working current of the first phase converter, that is, the charging current of the inductor in the first phase converter. Since the inductor current of each phase converter in this application can be the average current of the inductor in each phase converter in one charge-discharge cycle, the average inductor current can be calculated by dividing the area enclosed by the current curve of the inductor in one charge-discharge cycle and the time axis by the cycle. For example, when the circuit of the multi-phase interleaved parallel converter is in continuous conduction mode (CCM), the area enclosed by the current curve of the inductor in the first phase converter and the time axis in one charge-discharge cycle is the sum of the areas of the first trapezoid and the second trapezoid, where the upper and lower bases of the first trapezoid and the second trapezoid are both I. Lmin and I Lmax The height of the first trapezoid is T1, the height of the second trapezoid is T2, and T1 + T2 = T. Lmin and I Lmax Let I be the maximum and minimum inductor currents within one charge / discharge cycle, and let T be the charge / discharge cycle. Then, the average inductor current in the first phase converter is (Imax)min. Lmin +I Lmax ) / 2. According to the trapezoidal median theorem, the average current of the inductor is equal to the inductor current at the midpoint of the charging or discharging state. Since the charging or discharging state of the inductor is determined by the on or off state of the controllable switches in each phase converter, the processing module 12 can determine the inductor current value of the first phase converter as the midpoint of the on or off state of the controllable switches in the first phase converter, based on the current value of the first sampling resistor at the midpoint of the on or off state of the controllable switches in the first phase converter. Furthermore, the above conclusion also applies when the circuit containing the multiphase interleaved parallel converter is in Boundary Conduction Mode (BCM).

[0054] The power supply and corresponding current sampling method provided in this application embodiment reduce the circuit cost of the current sampling device, increase support for DC current sampling of multiphase interleaved parallel converters, and have strong applicability.

[0055] The power supply provided by the present application and its corresponding current sampling method can be adapted to different application scenarios, which are mainly divided into two application scenarios: current sharing regulation and circuit protection.

[0056] For the current sharing regulation scenario, the current sampling device can calculate the inductor currents of each phase converter in the multi-phase interleaved parallel converter according to the method of calculating the inductor current of the first-phase converter as described above, and control the on-time or off-time of the switching tubes of each phase converter according to the inductor currents of each phase converter, so as to make the inductor currents of each phase converter equal.

[0057] Specifically, assume that the inductor currents of the first-phase converter, the second-phase converter, …, the n-phase converter in the multi-phase interleaved parallel converter calculated by the current sampling device are x1, x2, …, x n , respectively. The target inductor current x = (x1 + x2 + … + x n ) / n is calculated according to the inductor currents of each phase converter. If x1 > x, the current sampling device shortens the on-time of the switching tube of the first-phase converter, or prolongs the off-time of the switching tube of the first-phase converter until x1 = x; if x1 < x, the current sampling device prolongs the on-time of the switching tube of the first-phase converter, or shortens the off-time of the switching tube of the first-phase converter until x1 = x. The equality of the inductor currents of each phase converter can be achieved according to the above method.

[0058] For the circuit protection scenario, the current sampling device determines the circuit state value of the first-phase converter according to the inductor current of the first-phase converter, and controls the on-time or off-time of the switching tube of the first-phase converter according to the circuit state value of the first-phase converter. Among them, the circuit state value can include input current value, output current value, input power value or output power value.

[0059] Specifically, if the first-phase converter is a Buck converter or an H-bridge converter operating in Buck mode, the current sampling device determines the inductor current value of the first-phase converter as its output current value. If the output current value of the first-phase converter is greater than or equal to the output current threshold, the device controls the on-time of the first-phase converter's switch to be 0, or controls the off-time of the first-phase converter's switch to be the entire cycle T, so that the first-phase converter stops working, thereby achieving output overcurrent protection for the first-phase converter. Furthermore, after determining the inductor current value of the first-phase converter as its output current value, the current sampling device can obtain the output voltage of the first-phase converter through a voltage sampling circuit, and calculate the product of the output current value and the output voltage of the first-phase converter to obtain the output power value of the first-phase converter. If the output power value of the first-phase converter is greater than or equal to the output power threshold, the device can control the first-phase converter to stop working in the above manner, thereby achieving output overpower protection for the first-phase converter.

[0060] If the first-phase converter is a Boost converter or an H-bridge converter operating in Boost mode, the current sampling device determines the inductor current value of the first-phase converter as its input current value. If the input current value of the first-phase converter is greater than or equal to the input current threshold, the device controls the on-time of the first-phase converter's switch to be 0, or controls the off-time of the first-phase converter's switch to be the entire cycle T, so that the first-phase converter stops working, thereby achieving input overcurrent protection for the first-phase converter. Furthermore, after determining the inductor current value of the first-phase converter as its input current value, the current sampling device can obtain the input voltage of the first-phase converter through a voltage sampling circuit, and calculate the input power value of the first-phase converter by multiplying the input current value and the input voltage. If the input power value of the first-phase converter is greater than or equal to the input power threshold, the device can control the first-phase converter to stop working in the above manner, thereby achieving input overpower protection for the first-phase converter.

[0061] If the first phase converter is a Buck-Boost converter or an H-bridge converter operating in Buck-Boost mode, such as Figure 1As shown, when the first sampling resistor is R1, the current sampling device determines the inductor current value of the first phase converter as the output current value of the first phase converter. If the output current value of the first phase converter is greater than or equal to the output current threshold, the first phase converter is controlled to stop working in the above manner, thereby realizing output overcurrent protection for the first phase converter. Furthermore, after determining the inductor current value of the first phase converter as the output current value of the first phase converter, the current sampling device obtains the output voltage of the first phase converter, and then obtains the output power value of the first phase converter. If the output power value of the first phase converter is greater than or equal to the output power threshold, the first phase converter is controlled to stop working in the above manner, thereby realizing output overpower protection for the first phase converter. With the first sampling resistor being R2, the current sampling device determines the inductor current value of the first-phase converter as the input current value of the first-phase converter. If the input current value of the first-phase converter is greater than or equal to the input current threshold, the first-phase converter is controlled to stop working in the above manner, thereby achieving input overcurrent protection for the first-phase converter. Furthermore, after determining the inductor current value of the first-phase converter as the input current value of the first-phase converter, the current sampling device obtains the input voltage of the first-phase converter, and then obtains the input power value of the first-phase converter. If the input power value of the first-phase converter is greater than or equal to the input power threshold, the first-phase converter is controlled to stop working in the above manner, thereby achieving input overpower protection for the first-phase converter.

[0062] In the specific implementation Figure 1 The number n of converters connected in parallel can be determined according to the actual application scenario and is not limited here. Furthermore, Figure 1 The schematic diagram shown is a connection diagram of some components of a multiphase parallel converter. A multiphase parallel converter may also include more components. The connection method of each component can be set according to the converter function required by the actual application scenario, and there are no restrictions here.

[0063] For example, see Figure 2a , Figure 2a This is a schematic diagram of the power supply structure provided in this application, which employs a two-phase interleaved parallel H-bridge converter. (See attached diagram.) Figure 2aAs shown, the power supply includes Vin, a two-phase interleaved parallel H-bridge converter, and a current sampling device. The two-phase interleaved parallel H-bridge converter includes a first-phase H-bridge converter and a second-phase H-bridge converter. The first-phase H-bridge converter includes switching transistors Q1, Q2, Q5, and Q6 and a power inductor L1. The second-phase H-bridge converter includes switching transistors Q3, Q4, Q7, and Q8 and a power inductor L2. The two-phase H-bridge converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the two-phase interleaved parallel H-bridge converter is connected to a first sampling resistor, which can be R1 or R2. That is, the current sampling device in this embodiment may include R1 / R2, or both R1 and R2. In addition, the current sampling device in this embodiment may also include a sampling module 20 and a processing module 21.

[0064] Q1-Q8 can be switching transistors including but not limited to MOSFETs, IGBTs, diodes, and transistors. L1 and L2 can be independent inductors or two-phase integrated inductors.

[0065] The H-bridge converter operates in Buck mode:

[0066] Processing module 21 controls Q5 and Q7 to remain normally on, and Q6 and Q8 to remain normally off, respectively outputting control signals with a period of 1 / f to Q1-Q4. Furthermore, the control signals output to Q1 and Q3 are 180° out of phase, and the control signals output to Q2 and Q4 are 180° out of phase, where f is the switching frequency of the switching transistors, so that Q1-Q4 switch at the switching frequency.

[0067] When the H-bridge converter operates in Buck mode, the power supply for the two-phase interleaved parallel H-bridge converter can be simplified as follows: Figure 2b The power supply shown employs a two-phase interleaved parallel Buck converter. For example... Figure 2b As shown, the power supply includes Vin, a two-phase interleaved parallel Buck converter, and a current sampling device. The two-phase interleaved parallel Buck converter includes a first-phase Buck converter and a second-phase Buck converter. The first-phase Buck converter includes switching transistors Q1 and Q2 and a power inductor L1, and the second-phase Buck converter includes switching transistors Q3 and Q4 and a power inductor L2. The two-phase Buck converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the two-phase interleaved parallel Buck converter is connected to a first sampling resistor, which can be R1 or R2. That is, the current sampling device in this embodiment may include R1, or both R1 and R2. In addition, the current sampling device in this embodiment may also include a sampling module 20 and a processing module 21. The processing module 21 is used to output control signals with a period of 1 / f and a phase difference of 180° to Q1 and Q3, respectively.

[0068] In one embodiment, the sampling module 20 is used to collect the current of the first sampling resistor R1, and the processing module 21 is used to obtain the current of R1 at a first moment, and determine the inductor current of the first phase Buck converter based on the current of R1 at the first moment.

[0069] Specifically, during the conduction period of Q1, L1 in the first-phase Buck converter is in a charging state. The current flowing from the positive terminal of Vin reaches the load through Q1 and L1, and then from the load through R1 to the negative terminal of Vin, forming the working circuit of the first-phase Buck converter. Vin stores energy for L1 through the working circuit of the first-phase Buck converter. During the conduction period of Q1, there is a period when Q3 is in the off state and Q4 is in the on state. This period includes the midpoint of the conduction period of Q1. During this period, L2 in the second-phase Buck converter is in a discharging state. The energy stored in L2 can supply energy to the load through the working circuit of the second-phase Buck converter composed of L2 and Q4. That is, at the first moment, the working circuit of the first-phase Buck converter passes through R1, while the working circuit of the second-phase Buck converter does not pass through R1. The processing module 21 can obtain the current of R1 at the first moment and determine the current value of R1 at the first moment as the inductor current value of the first-phase Buck converter. The first moment can be the midpoint of the conduction period of Q1.

[0070] Similarly, at the first moment, the operating circuit of the first-phase Buck converter does not pass through R1, while the operating circuit of the second-phase Buck converter does pass through R1. The processing module 21 can obtain the current of R1 at the first moment and determine the current value of R1 at the first moment as the inductor current value of the second-phase Buck converter. Here, the first moment can be the midpoint of the conduction period of Q3.

[0071] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0072] When the processing module 21 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0073] In another embodiment, sampling module 20 is used to collect the current of the first sampling resistor R2 and the current of the second sampling resistor R1. Processing module 21 is used to obtain the current of R1 and the current of R2 at a first moment, and determine the inductor current of the first phase Buck converter based on the difference between the current of R2 and the current of R1 at the first moment.

[0074] Specifically, during the conduction of Q2, L1 in the first-phase Buck converter is in a discharging state, and the energy stored in L1 can supply power to the load through the working circuit of the first-phase Buck converter composed of L1, R2, and Q2. During the conduction of Q2, there is a period when Q4 is in a turning-off state and Q3 is in a conducting state. This period includes the midpoint of the conduction of Q2. During this time, L2 in the second-phase Buck converter is in a charging state. The current flowing out of the positive terminal of Vin reaches the load through Q3 and L2, and then from the load through R2 and R1 to the negative terminal of Vin, forming the working circuit of the second-phase Buck converter. Vin stores energy for L2 through the working circuit of the second-phase Buck converter. At the first instant, the operating circuits of both the first-phase Buck converter and the second-phase Buck converter pass through R2, while the operating circuit of the second-phase Buck converter passes through R1. The processing module 21 can obtain the current values ​​of R2 and R1 at the first instant and determine the difference between them as the inductor current value of the first-phase Buck converter. The first instant can be the midpoint of the conduction period of Q2.

[0075] Similarly, at the first moment, the operating circuits of both the first-phase Buck converter and the second-phase Buck converter pass through R2, while the operating circuit of the first-phase Buck converter passes through R1. The processing module 21 can obtain the current values ​​of R2 and R1 at the first moment, and determine the difference between the current values ​​of R2 and R1 at the first moment as the inductor current value of the second-phase Buck converter. The first moment can be the midpoint of the conduction period of Q4.

[0076] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0077] When processing module 21 determines at a first moment that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it acquires the first current of the first sampling resistor, wherein the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter; it acquires the second current of the second sampling resistor at a first moment, wherein the working circuits of other converters in the multiphase interleaved parallel converter pass through the second sampling resistor at the first moment, and the second sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter; and it determines the difference between the first current of the first sampling resistor and the second current of the second sampling resistor as the inductor current of the first phase converter.

[0078] The H-bridge converter operates in Boost mode:

[0079] Processing module 21 controls Q1 and Q3 to remain normally on, and Q2 and Q4 to remain normally off. It outputs control signals with a period of 1 / f to the switching transistors Q5, Q6, Q7 and Q8 respectively. The control signals output to Q5 and Q7 are 180° out of phase, and the control signals output to Q6 and Q8 are 180° out of phase. Here, f is the switching frequency of the switching transistors, so that Q5, Q6, Q7 and Q8 switch at the switching frequency.

[0080] When the H-bridge converter operates in Boost mode, the power supply for the two-phase interleaved parallel H-bridge converter can be simplified as follows: Figure 2c The power supply shown employs a two-phase interleaved parallel Boost converter. For example... Figure 2c As shown, the power supply includes Vin, a two-phase interleaved parallel Boost converter, and a current sampling device. The two-phase interleaved parallel Boost converter includes a first-phase Boost converter and a second-phase Boost converter. The first-phase Boost converter includes switching transistors Q5 and Q6 and a power inductor L1, and the second-phase Boost converter includes switching transistors Q7 and Q8 and a power inductor L2. The two-phase Boost converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the two-phase interleaved parallel Boost converter is connected to a first sampling resistor, which can be R1 or R2. That is, the current sampling device in this embodiment may include R2, or both R1 and R2. In addition, the current sampling device in this embodiment may also include a sampling module 20 and a processing module 21. The processing module 21 is used to output control signals with a period of 2πf and a phase difference of 180° to Q6 and Q8, respectively.

[0081] In one embodiment, the sampling module 20 is used to collect the current of the first sampling resistor R2, and the processing module 21 is used to obtain the current of R2 at a first moment, and determine the inductor current of the first phase Boost converter based on the current of R2 at the first moment.

[0082] Specifically, during the conduction period of Q5, L1 in the first-phase Boost converter is in a discharging state. The current flowing out of the positive terminal of Vin reaches Q5 through L1, and then from Q5 through the load and R2 to the negative terminal of Vin, forming the working circuit of the first-phase Boost converter. Vin supplies power to the load through the working circuit of the first-phase Boost converter. During the conduction period of Q5, there is a period when Q7 is in a turning-off state and Q8 is in a conducting state. This period includes the midpoint of the conduction period of Q5. During this time, L2 in the second-phase Boost converter is in a charging state. The current flowing out of the positive terminal of Vin reaches the negative terminal of Vin through L2 through Q8, forming the working circuit of the second-phase Boost converter. Vin stores energy for L2 through the working circuit of the second-phase Boost converter. That is, at the first moment, the working circuit of the first-phase Boost converter passes through R2, while the working circuit of the second-phase Boost converter does not pass through R2. The processing module 21 can obtain the current of R2 at the first moment and determine the current value of R2 at the first moment as the inductor current value of the first-phase Boost converter. The first moment can be the midpoint of the Q5 conduction period.

[0083] Similarly, at the first moment, the operating circuit of the first-phase Boost converter does not pass through R2, while the operating circuit of the second-phase Boost converter does pass through R2. The processing module 21 can obtain the current of R2 at the first moment and determine the current value of R2 at the first moment as the inductor current value of the second-phase Boost converter. Here, the first moment can be the midpoint of the conduction period of Q7.

[0084] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0085] When the processing module 21 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0086] In another embodiment, the sampling module 20 is used to collect the current of the first sampling resistor R1 and the current of the second sampling resistor R2, and the processing module 21 is used to obtain the current of R1 and the current of R2 at the first moment, and determine the inductor current of the first phase Boost converter based on the difference between the current of R1 and the current of R2 at the first moment.

[0087] Specifically, during the conduction period of Q6, L1 in the first-phase Boost converter is in a charging state. The current flowing out of the positive terminal of Vin reaches Q6 through L1, and then from Q6 through R1 to the negative terminal of Vin, forming the working circuit of the first-phase Boost converter. Vin stores energy for L1 through the working circuit of the first-phase Boost converter. During the conduction period of Q6, there is a period when Q8 is in a turning-off state and Q7 is in a conducting state. This period includes the midpoint of the conduction period of Q6. During this period, L2 in the second-phase Boost converter is in a discharging state. The current flowing out of the positive terminal of Vin reaches Q7 through L2, and then from Q7 through R2 and R1 to the negative terminal of Vin, forming the working circuit of the second-phase Boost converter. Vin supplies energy to the load through the working circuit of the second-phase Boost converter. At the first instant, the operating circuits of both the first-phase Boost converter and the second-phase Boost converter pass through R1, while the operating circuit of the second-phase Boost converter passes through R2. The processing module 21 can obtain the current values ​​of R1 and R2 at the first instant and determine the difference between them as the inductor current value of the first-phase Boost converter. The first instant can be the midpoint of the conduction period of Q6.

[0088] Similarly, at the first moment, the operating circuits of both the first-phase Boost converter and the second-phase Boost converter pass through R1, and the operating circuit of the first-phase Boost converter passes through R2. The processing module 21 can obtain the current values ​​of R1 and R2 at the first moment, and determine the difference between the current values ​​of R1 and R2 at the first moment as the inductor current value of the second-phase Boost converter. The first moment can be the midpoint of the conduction period of Q8.

[0089] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0090] When processing module 21 determines at a first moment that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it acquires the first current of the first sampling resistor, wherein the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter; it acquires the second current of the second sampling resistor at a first moment, wherein the working circuits of other converters in the multiphase interleaved parallel converter pass through the second sampling resistor at the first moment, and the second sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter; and it determines the difference between the first current of the first sampling resistor and the second current of the second sampling resistor as the inductor current of the first phase converter.

[0091] See also Figure 2a The H-bridge converter operates in Buck-Boost mode:

[0092] Processing module 21 outputs control signals with a period of 1 / f to the switching transistors Q1-Q8 respectively. The control signals output to Q1 and Q6 are 0° out of phase, the control signals output to Q2 and Q5 are 0° out of phase, the control signals output to Q3 and Q8 are 0° out of phase, the control signals output to Q4 and Q7 are 0° out of phase, the control signals output to Q1 and Q3 are 180° out of phase, the control signals output to Q2 and Q4 are 180° out of phase, the control signals output to Q5 and Q7 are 180° out of phase, and the control signals output to Q6 and Q8 are 180° out of phase. Here, f is the switching frequency of the switching transistors, so that Q1-Q8 switch at the switching frequency.

[0093] In one embodiment, the sampling module 20 is used to collect the current of the first sampling resistor R1, and the processing module 21 is used to obtain the current of R1 at a first moment, and determine the inductor current of the first phase H-bridge converter based on the current of R1 at the first moment.

[0094] Specifically, during the conduction period of Q1 and Q6, L1 in the first phase H-bridge converter is in a charging state. The current flowing out of the positive terminal of Vin reaches L1 through Q1, and then from L1 through Q6 and R1 to the negative terminal of Vin, forming the working circuit of the first phase H-bridge converter. Vin stores energy for L1 through the working circuit of the first phase H-bridge converter. During the conduction period of Q1 and Q6, there is a period when Q3 and Q8 are in the off state and Q4 and Q7 are in the on state. This period includes the midpoint of the conduction period of Q1 and Q6. During this period, L2 in the second phase H-bridge converter is in a discharging state. The energy stored on L2 can supply power to the load through the working circuit of the second phase H-bridge converter composed of L2, Q7 and Q4. That is, at the first moment, the working circuit of the first phase H-bridge converter passes through R1, while the working circuit of the second phase H-bridge converter does not pass through R1. The processing module 21 can obtain the current of R1 at the first moment and determine the current value of R1 at the first moment as the inductor current value of the first phase H-bridge converter. Here, the first moment can be the midpoint of the conduction period of Q1 and Q6.

[0095] Similarly, at the first moment, the working circuit of the first-phase H-bridge converter does not pass through R1, while the working circuit of the second-phase H-bridge converter does pass through R1. The processing module 21 can obtain the current of R1 at the first moment and determine the inductor current value of the second-phase H-bridge converter from the current value of R1 at the first moment. Here, the first moment can be the midpoint of the conduction period of Q3 and Q8.

[0096] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0097] When the processing module 21 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0098] In another embodiment, the sampling module 20 is used to collect the current of the first sampling resistor R2, and the processing module 21 is used to obtain the current of R2 at a first moment, and determine the inductor current of the first phase H-bridge converter based on the current of R2 at the first moment.

[0099] Specifically, during the conduction period of Q2 and Q5, L1 in the first phase H-bridge converter is in a discharging state. The energy stored in L1 can supply power to the load through the working circuit of the first phase H-bridge converter composed of L1, Q5, R2 and Q2. During the conduction period of Q2 and Q5, there is a period when Q4 and Q7 are in a turning-off state and Q3 and Q8 are in a conducting state. This period includes the midpoint of the conduction period of Q2 and Q5. During this period, L2 in the second phase H-bridge converter is in a charging state. The current flowing out of the positive terminal of Vin reaches L2 through Q3, and then from L2 through Q8 to the negative terminal of Vin, forming the working circuit of the second phase H-bridge converter. Vin stores energy for L2 through the working circuit of the second phase H-bridge converter. That is, at the first moment, the working circuit of the first phase H-bridge converter passes through R2, while the working circuit of the second phase H-bridge converter does not pass through R2. The processing module 21 can obtain the current of R2 at the first moment and determine the current value of R2 at the first moment as the inductor current value of the first phase H-bridge converter. Here, the first moment can be the midpoint of the conduction period of Q2 and Q5.

[0100] Similarly, at the first moment, the working circuit of the first-phase H-bridge converter does not pass through R2, while the working circuit of the second-phase H-bridge converter does pass through R2. The processing module 21 can obtain the current of R2 at the first moment and determine the inductor current value of the second-phase H-bridge converter from the current value of R2 at the first moment. Here, the first moment can be the midpoint of the conduction period of Q4 and Q7.

[0101] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0102] When the processing module 21 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0103] In this embodiment, when the processing module 21 determines that only the working circuit of the first phase H-bridge converter passes through the first sampling resistor R1 or R2 at the first moment, it determines the current value of the first sampling resistor at the first moment as the inductor current value of the first phase H-bridge converter; when the currents on the first sampling resistor R1 and the second sampling resistor R2 at the first moment are not only the working current of the first phase H-bridge converter, it determines the difference between the current value of R1 and the current value of R2 at the first moment as the inductor current value of the first phase H-bridge converter; when the currents on the first sampling resistor R2 and the second sampling resistor R1 at the first moment are not only the working current of the first phase H-bridge converter, it determines the difference between the current value of R2 and the current value of R1 at the first moment as the inductor current value of the first phase H-bridge converter.

[0104] For example, see Figure 3 , Figure 3 This is a schematic diagram of the power supply structure provided in this application, which employs a two-phase interleaved parallel Buck-Boost converter. (See attached diagram.) Figure 3 As shown, the power supply includes Vin, a two-phase interleaved parallel Buck-Boost converter, and a current sampling device. The two-phase interleaved parallel Buck-Boost converter includes a first-phase Buck-Boost converter and a second-phase Buck-Boost converter. The first-phase Buck-Boost converter includes switching transistors Q1 and Q2 and a power inductor L1, while the second-phase Buck-Boost converter includes switching transistors Q3 and Q4 and a power inductor L2. The two-phase Buck-Boost converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the two-phase interleaved parallel Buck-Boost converter is connected to a first sampling resistor, which can be R1 or R2. That is, the current sampling device in this embodiment may include R1 / R2. In addition, the current sampling device in this embodiment may also include a sampling module 30 and a processing module 31. The processing module 31 is used to output control signals with a period of 1 / f and a phase difference of 180° to Q1 and Q3, respectively, where f is the switching frequency of the switching transistors.

[0105] Q1-Q4 can be switching transistors including but not limited to MOSFETs, IGBTs, diodes, and transistors. L1 and L2 can be independent inductors or two-phase integrated inductors.

[0106] In one embodiment, the sampling module 30 is used to collect the current of the first sampling resistor R1, and the processing module 31 is used to obtain the current of R1 at a first moment, and determine the inductor current of the first phase Buck-Boost converter based on the current of R1 at the first moment.

[0107] Specifically, during the conduction period of Q1, L1 in the first-phase Buck-Boost converter is in a charging state. The current flowing from the positive terminal of Vin reaches L1 through Q1, and then from L1 through R1 to the negative terminal of Vin, forming the working circuit of the first-phase H-bridge converter. Vin stores energy for L1 through the working circuit of the first-phase H-bridge converter. During the conduction period of Q1, there is a period when Q3 is in the off state and Q4 is in the on state. This period includes the midpoint of the conduction period of Q1. During this time, L2 in the second-phase Buck-Boost converter is in a discharging state. The energy stored in L2 can supply power to the load through the working circuit of the second-phase Buck-Boost converter composed of L2 and Q4. That is, at the first moment, the working circuit of the first-phase Buck-Boost converter passes through R1, while the working circuit of the second-phase Buck-Boost converter does not pass through R1. The processing module 31 can obtain the current of R1 at the first moment and determine the current value of R1 at the first moment as the inductor current value of the first-phase Buck-Boost converter. The first moment can be the midpoint of the Q1 conduction period.

[0108] Similarly, at the first moment, the operating circuit of the first-phase Buck-Boost converter does not pass through R1, while the operating circuit of the second-phase Buck-Boost converter does pass through R1. The processing module 31 can obtain the current of R1 at the first moment and determine the current value of R1 at the first moment as the inductor current value of the second-phase Buck-Boost converter. Here, the first moment can be the midpoint of the conduction period of Q3.

[0109] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0110] When the processing module 31 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0111] In another embodiment, the sampling module 30 is used to collect the current of the first sampling resistor R2, and the processing module 31 is used to obtain the current of R2 at a first moment, and determine the inductor current of the first phase Buck-Boost converter based on the current of R2 at the first moment.

[0112] Specifically, during the conduction period of Q2, L1 in the first-phase Buck-Boost converter is in a discharging state. The energy stored in L1 can supply power to the load through the working circuit of the first-phase Buck-Boost converter, which consists of L1, Q2, and R2. During the conduction period of Q2, there is a time interval when Q4 is in a turned-off state and Q3 is in a conducting state. This time interval includes the midpoint of the conduction period of Q2. During this period, L2 in the second-phase Buck-Boost bridge converter is in a charging state. The current flowing out of the positive terminal of Vin reaches L2 through Q3, and then reaches the negative terminal of Vin from L2, forming the working circuit of the second-phase H-bridge converter. Vin stores energy for L2 through the working circuit of the second-phase H-bridge converter. That is, at the first moment, the working circuit of the first-phase Buck-Boost converter passes through R2, while the working circuit of the second-phase Buck-Boost converter does not pass through R2. The processing module 31 can obtain the current of R2 at the first moment and determine the current value of R2 at the first moment as the inductor current value of the first-phase Buck-Boost converter. The first moment can be the midpoint of the Q2 conduction period.

[0113] Similarly, at the first moment, the operating circuit of the first-phase Buck-Boost converter does not pass through R2, while the operating circuit of the second-phase Buck-Boost converter does pass through R2. The processing module 31 can obtain the current of R2 at the first moment and determine the current value of R2 at the first moment as the inductor current value of the second-phase Buck-Boost converter. Here, the first moment can be the midpoint of the conduction period of Q4.

[0114] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0115] When the processing module 31 determines at the first moment that the working circuits of other converters in the multiphase interleaved parallel converter do not pass through the first sampling resistor, the first current of the first sampling resistor is determined as the inductor current of the first phase converter. At the first moment, the working circuit of the first phase converter passes through the first sampling resistor, and the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0116] In this embodiment of the application, when the processing module 31 determines that only the working circuit of the first phase Buck-Boost converter passes through the first sampling resistor R1 or R2 at the first moment, the current value of the first sampling resistor at the first moment is determined as the inductor current value of the first phase Buck-Boost converter.

[0117] For example, see Figure 4a , Figure 4a This is a schematic diagram of the power supply structure provided in this application, which uses a three-phase interleaved parallel H-bridge converter. (See attached diagram.) Figure 4aAs shown, the power supply includes Vin, a three-phase interleaved parallel H-bridge converter, and a current sampling device. The three-phase interleaved parallel H-bridge converter includes phase 1 to phase 3 H-bridge converters. Phase 1 includes transistors Q1, Q2, Q7, and Q8 and a power inductor L1; phase 2 includes transistors Q3, Q4, Q9, and Q10 and a power inductor L2; and phase 3 includes transistors Q5, Q6, Q11, and Q12 and a power inductor L3. The three-phase H-bridge converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the three-phase interleaved parallel H-bridge converter is connected to a first sampling resistor, which can be R1 or R2. That is, the current sampling device in this embodiment may include R1 / R2. Additionally, the current sampling device in this embodiment may also include a sampling module 40 and a processing module 41.

[0118] Q1-Q12 can be switching transistors including but not limited to MOSFETs, IGBTs, diodes, and transistors. L1, L2, and L3 can be independent inductors or three-phase integrated inductors.

[0119] The H-bridge converter operates in Buck mode:

[0120] Processing module 41 controls Q7, Q9, and Q11 to remain normally on, and Q8, Q10, and Q12 to remain normally off. It outputs control signals with a period of 1 / f to Q1-Q6 respectively. Furthermore, the control signals output to any two switches among Q1, Q3, and Q5 are 120° out of phase, and the control signals output to any two switches among Q2, Q4, and Q6 are 120° out of phase, where f is the switching frequency of the switches, so that Q1-Q6 switch at the switching frequency.

[0121] When the H-bridge converter operates in Buck mode, the power supply for the three-phase interleaved parallel H-bridge converter can be simplified as follows: Figure 4b The power supply shown employs a three-phase interleaved parallel Buck converter. For example... Figure 4bAs shown, the power supply includes Vin, a three-phase interleaved parallel Buck converter, and a current sampling device. The three-phase interleaved parallel Buck converter includes three phase Buck converters: the first phase Buck converter and the third phase Buck converter. The first phase Buck converter includes switches Q1 and Q2 and a power inductor L1; the second phase Buck converter includes switches Q3 and Q4 and a power inductor L2; and the third phase Buck converter includes switches Q5 and Q6 and a power inductor L3. The three phase Buck converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the three-phase interleaved parallel Buck converter is connected to a first sampling resistor R1. The current sampling device in this embodiment may include R1, and may also include a sampling module 40 and a processing module 41. The processing module 41 is used to output control signals with a phase difference of 120° to the switches (such as Q1 and Q3) at the same position in any two phases of the three-phase Buck converter.

[0122] In one embodiment, the sampling module 40 is used to collect the current of the first sampling resistor R1, and the processing module 41 is used to obtain the current of R1 at a first time and the current of R1 at a second time, and determine the difference between the current of R1 at the first time and the current of R1 at the second time as the inductor current of the first phase Buck converter. Specifically, at the first time, the operating circuits of all three phase Buck converters pass through R1; at the second time, the operating circuit of the first phase Buck converter does not pass through R1; and the operating circuits of the second and third phase Buck converters both pass through R1. For example, if the first time is the midpoint of the conduction period of the switch in the first phase Buck converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase Buck converter; if the first time is the midpoint of the turn-off period of the switch in the first phase Buck converter, then the second time is the midpoint of the conduction period of the same switch in the first phase Buck converter.

[0123] Specifically, during the conduction period of Q1, L1 in the first-phase Buck converter is in a charging state. The current flowing from the positive terminal of Vin reaches L1 through Q1, and then from L1 through the load and R1 to the negative terminal of Vin, forming the working circuit of the first-phase Buck converter. Vin stores energy for L1 through the working circuit of the first-phase Buck converter. During the conduction period of Q1, there is a period when Q3 is in a conducting state, which includes the midpoint of the conduction period of Q1. During this period, L2 in the second-phase Buck converter is in a charging state. The current flowing from the positive terminal of Vin reaches L2 through Q3, and then from L2 through the load and R1 to the negative terminal of Vin, forming the working circuit of the first-phase Buck converter. The load and R1 reach the negative terminal of Vin, forming the working circuit of the second-phase Buck converter. Vin stores energy for L2 through the working circuit of the second-phase Buck converter. During the conduction period of Q1, there is a period when Q5 is in the conduction state. This period includes the midpoint of the conduction period of Q1. In the third-phase Buck converter, L3 is in the charging state. The current flowing out of the positive terminal of Vin reaches L3 through Q5, and then from L3 through the load and R1 to the negative terminal of Vin, forming the working circuit of the third-phase Buck converter. Vin stores energy for L3 through the working circuit of the third-phase Buck converter.

[0124] During the off-state of Q1, Q2 is in the on-state, and L1 in the first-phase Buck converter is in the discharging state. The energy stored in L1 can supply power to the load through the working circuit of the first-phase Buck converter composed of L1 and Q2. During the off-state of Q1, there is a period during which Q3 is in the on-state, which includes the midpoint of the off-state of Q1. During this period, L2 in the second-phase Buck converter is in the charging state. During the off-state of Q1, there is a period during which Q5 is in the on-state, which includes the midpoint of the off-state of Q1. During this period, L3 in the third-phase Buck converter is in the charging state.

[0125] It is understood that during the Q1 turn-on period, there is a time interval during which all Buck converter operating circuits pass through R1, including the midpoint of the Q1 turn-on period. During the Q1 turn-off period, there is a time interval during which the operating circuit of the first-phase Buck converter does not pass through R1, while the operating circuits of the second-phase and third-phase Buck converters both pass through R1, including the midpoint of the Q1 turn-off period. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the inductor current value of the first-phase Buck converter as the difference between the current value of R1 at the first moment and the current value of R1 at the second moment. The first moment can be the midpoint of the Q1 turn-on period, and the second moment can be the midpoint of the Q1 turn-off period.

[0126] Similarly, during the Q3 conduction period, there is a time interval during which all Buck converter operating circuits pass through R1, including the midpoint of the Q3 conduction period. During the Q3 turn-off period, the operating circuit of the second-phase Buck converter does not pass through R1, while the operating circuits of the first-phase and third-phase Buck converters pass through R1, including the midpoint of the Q3 turn-off period. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the difference between the current value of R1 at the first moment and the current value of R1 at the second moment as the inductor current value of the second-phase Buck converter. The first moment can be the midpoint of the Q3 conduction period, and the second moment can be the midpoint of the Q3 turn-off period.

[0127] Furthermore, since the current values ​​of R1 at the midpoint of Q1's conduction period and at the midpoint of Q3's conduction period are equal, representing the total current of the three-phase Buck converter, the processing module 41 can obtain the current value of R1 at the second moment. The difference between the current value of R1 at the first moment and the current value of R1 at the second moment is determined as the inductor current value of the second-phase Buck converter. The first moment can be the midpoint of Q1's conduction period, and the second moment can be the midpoint of Q3's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0128] Similarly, during the Q5 conduction period, there is a time interval during which all Buck converter operating circuits pass through R1, including the midpoint of the Q5 conduction period. During the Q5 turn-off period, the operating circuit of the third-phase Buck converter does not pass through R1, while the operating circuits of the first-phase and second-phase Buck converters pass through R1, including the midpoint of the Q5 turn-off period. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the difference between the current value of R1 at the first moment and the current value of R1 at the second moment as the inductor current value of the third-phase Buck converter. The first moment can be the midpoint of the Q5 conduction period, and the second moment can be the midpoint of the Q5 turn-off period.

[0129] Furthermore, since the current values ​​of R1 at the midpoint of Q1's conduction period and at the midpoint of Q5's conduction period are equal, representing the total current of the three-phase Buck converter, the processing module 41 can obtain the current value of R1 at the second moment. The difference between the current value of R1 at the first moment and the current value of R1 at the second moment is determined as the inductor current value of the third-phase Buck converter. The first moment can be the midpoint of Q1's conduction period, and the second moment can be the midpoint of Q5's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0130] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0131] In the first moment, when the processing module 41 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor; in the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor; the difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0132] The H-bridge converter operates in Boost mode:

[0133] Processing module 41 controls Q1, Q3, and Q5 to remain normally on, and Q2, Q4, and Q6 to remain normally off. It outputs control signals with a period of 1 / f to the switching transistors Q7-Q12 respectively. Furthermore, the control signals output to any two switching transistors Q7, Q9, and Q11 are 120° out of phase, and the control signals output to any two switching transistors Q8, Q10, and Q12 are 120° out of phase. Here, f is the switching frequency of the switching transistors, so that Q7-Q12 switch at the switching frequency.

[0134] When the H-bridge converter operates in Boost mode, the power supply for the three-phase interleaved parallel H-bridge converter can be simplified as follows: Figure 4c The power supply shown employs a three-phase interleaved parallel Boost converter. For example... Figure 4c As shown, the power supply includes Vin, a three-phase interleaved parallel Boost converter, and a current sampling device. The three-phase interleaved parallel Boost converter includes three phases: Phase 1 Boost converter to Phase 3 Boost converter. Phase 1 Boost converter includes switches Q7 and Q8 and a power inductor L1; Phase 2 Boost converter includes switches Q9 and Q10 and a power inductor L2; and Phase 3 Boost converter includes switches Q11 and Q12 and a power inductor L3. The three-phase Boost converter is connected in parallel via in1, in2, out1, and out2. Furthermore, the three-phase interleaved parallel Boost converter is connected to a first sampling resistor R2. The current sampling device in this embodiment may include R2, and may also include a sampling module 40 and a processing module 41. The processing module 41 is used to output control signals with a phase difference of 120° to the switches (such as Q8 and Q10) at the same position in any two phases of the three-phase Boost converter.

[0135] In one embodiment, the sampling module 40 is used to collect the current of the first sampling resistor R2, and the processing module 41 is used to obtain the current of R2 at a first time and the current of R2 at a second time, and determine the difference between the current of R2 at the first time and the current of R2 at the second time as the inductor current of the first phase Boost converter. Specifically, at the first time, the operating circuits of all three phase Boost converters pass through R2; at the second time, the operating circuit of the first phase Boost converter does not pass through R2; and the operating circuits of the second and third phase Boost converters both pass through R2. For example, if the first time is the midpoint of the conduction period of the switch in the first phase Boost converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase Boost converter; if the first time is the midpoint of the turn-off period of the switch in the first phase Boost converter, then the second time is the midpoint of the conduction period of the same switch in the first phase Boost converter.

[0136] Specifically, during the conduction period of Q7, L1 in the first-phase Boost converter is in a discharging state. The current flowing out of the positive terminal of Vin reaches Q7 through L1, and then from Q7 through R2 to the negative terminal of Vin, forming the working circuit of the first-phase Boost converter. Vin supplies power to the load through the working circuit of the first-phase Boost converter. During the conduction period of Q7, there is a period when Q9 is in a conducting state, including the midpoint of the conduction period of Q7. During this period, L2 in the second-phase Boost converter is in a discharging state. The current flowing out of the positive terminal of Vin reaches Q9 through L2, and then from Q9 through R2 to the negative terminal of Vin, forming the working circuit of the first-phase Boost converter. R2 reaches the negative terminal of Vin, forming the working circuit of the second-phase Boost converter. Vin supplies power to the load through the working circuit of the second-phase Boost converter. During the conduction period of Q7, there is a period when Q11 is in the conducting state. This period includes the midpoint of the conduction period of Q7. In the third-phase Boost converter, L3 is in the discharging state. The current flowing out of the positive terminal of Vin reaches Q11 through L3, and then from Q11 through R2 to the negative terminal of Vin, forming the working circuit of the third-phase Boost converter. Vin supplies power to the load through the working circuit of the third-phase Boost converter.

[0137] During the off period of Q7, Q8 is in the on state, and L1 in the first phase Boost converter is in the charging state. The current flowing out of the positive terminal of Vin passes through L1 and Q8 to reach the negative terminal of Vin, forming the working circuit of the first phase Boost converter. Vin stores energy for L1 through the working circuit of the first phase Boost converter. During the off period of Q7, there is a period when Q9 is in the on state, which includes the midpoint of the off period of Q7. During this period, L2 in the second phase Boost converter is in the discharging state. During the off period of Q7, there is a period when Q11 is in the on state, which includes the midpoint of the off period of Q7. During this period, L3 in the third phase Boost converter is in the discharging state.

[0138] It is understood that during the Q7 conduction period, there is a time interval during which all Boost converter operating circuits pass through R2, including the midpoint of the Q7 conduction period. During the Q7 turn-off period, there is a time interval during which the operating circuit of the first phase Boost converter does not pass through R2, while the operating circuits of the second and third phase Boost converters both pass through R2, including the midpoint of the Q7 turn-off period. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the first phase Boost converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. The first moment can be the midpoint of the Q7 conduction period, and the second moment can be the midpoint of the Q7 turn-off period.

[0139] Similarly, during the Q9 conduction period, there is a time interval during which all Boost converter operating circuits pass through R2, including the midpoint of the Q9 conduction period. During the Q9 turn-off period, the operating circuit of the second-phase Boost converter does not pass through R2, while the operating circuits of the first-phase and third-phase Boost converters pass through R2, including the midpoint of the Q9 turn-off period. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the second-phase Boost converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. The first moment can be the midpoint of the Q9 conduction period, and the second moment can be the midpoint of the Q9 turn-off period.

[0140] Furthermore, since the current values ​​of R2 at the midpoint of Q7's conduction period and at the midpoint of Q9's conduction period are equal, representing the total current of the three-phase Boost converter, the processing module 41 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the second-phase Boost converter. The first moment can be the midpoint of Q7's conduction period, and the second moment can be the midpoint of Q9's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0141] Similarly, during the Q11 conduction period, there is a time interval during which all Boost converter operating circuits pass through R2, including the midpoint of the Q11 conduction period. During the Q11 turn-off period, the operating circuit of the third-phase Boost converter does not pass through R2, while the operating circuits of the first-phase and second-phase Boost converters pass through R2, including the midpoint of the Q11 turn-off period. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the third-phase Boost converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. The first moment can be the midpoint of the Q11 conduction period, and the second moment can be the midpoint of the Q11 turn-off period.

[0142] Furthermore, since the current values ​​of R2 at the midpoint of Q7's conduction period and at the midpoint of Q11's conduction period are equal, representing the total current of the three-phase Boost converter, the processing module 41 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the third-phase Boost converter. The first moment can be the midpoint of Q7's conduction period, and the second moment can be the midpoint of Q11's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0143] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0144] In the first moment, when the processing module 41 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor; in the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor; the difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0145] See also Figure 4a The H-bridge converter operates in Buck-Boost mode:

[0146] The processing module 41 outputs control signals with a period of 1 / f to the switching transistors Q1-Q12 respectively. Furthermore, the control signals output to two switching transistors in diagonal positions in the same converter (such as Q1 and Q8, Q2 and Q7) are 0° out of phase, and the control signals output to two switching transistors in the same position in any two phases of the three-phase H-bridge converter (such as Q1 and Q3, Q1 and Q5, Q3 and Q5) are 120° out of phase, where f is the switching frequency of the switching transistor.

[0147] In one embodiment, the sampling module 40 is used to collect the current of the first sampling resistor R1, and the processing module 41 is used to obtain the current of R1 at a first time and the current of R1 at a second time, and determine the difference between the current of R1 at the first time and the current of R1 at the second time as the inductor current of the first phase H-bridge converter. Specifically, at the first time, the operating circuits of all three phases of the H-bridge converter pass through R1; at the second time, the operating circuit of the first phase H-bridge converter does not pass through R1; and the operating circuits of the second and third phases of the H-bridge converter both pass through R1. For example, if the first time is the midpoint of the conduction period of the switch in the first phase H-bridge converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase H-bridge converter; if the first time is the midpoint of the turn-off period of the switch in the first phase H-bridge converter, then the second time is the midpoint of the conduction period of the same switch in the first phase H-bridge converter.

[0148] Specifically, during the conduction period of Q1 and Q8, L1 in the first phase H-bridge converter is in a charging state. The current flowing out of the positive terminal of Vin reaches L1 through Q1, and then from L1 through Q8 and R1 to the negative terminal of Vin, forming the working circuit of the first phase H-bridge converter. Vin stores energy for L1 through the working circuit of the first phase H-bridge converter. During the conduction period of Q1 and Q8, there is a period when Q3 and Q10 are in a conducting state. This period includes the midpoint of the conduction period of Q1 and Q8. During this time, L2 in the second phase H-bridge converter is in a charging state. The current flowing out of the positive terminal of Vin reaches L2 through Q3, and then from L2... The current flows through Q10 and R1 to the negative terminal of Vin, forming the working circuit of the second-phase H-bridge converter. Vin stores energy for L2 through the working circuit of the second-phase H-bridge converter. During the conduction period of Q1 and Q8, there is a period when Q5 and Q12 are in the conducting state. This period includes the midpoint of the conduction period of Q1 and Q8. L3 in the third-phase H-bridge converter is in the charging state. The current flowing out of the positive terminal of Vin reaches L3 through Q5, and then from L3 through Q12 and R1 to the negative terminal of Vin, forming the working circuit of the third-phase H-bridge converter. Vin stores energy for L3 through the working circuit of the third-phase H-bridge converter.

[0149] During the off-state of Q1 and Q8, Q2 and Q7 are on-state, and L1 in the first-phase H-bridge converter is in a discharging state. The energy stored in L1 can supply power to the load through the working circuit of the first-phase H-bridge converter, which consists of L1, Q7, the load, and Q2. During the off-state of Q1 and Q8, there is a period during which Q3 and Q10 are on-state, including the midpoint of the off-state of Q1 and Q8. During this period, L2 in the second-phase H-bridge converter is in a charging state. During the off-state of Q1 and Q8, there is a period during which Q5 and Q12 are on-state, including the midpoint of the off-state of Q1 and Q8. During this period, L3 in the third-phase H-bridge converter is in a charging state.

[0150] It is understood that during the conduction period of Q1 and Q8, there is a time period during which the operating circuits of all H-bridge converters pass through R1. This time period includes the midpoint of the conduction period of Q1 and Q8. During the turn-off period of Q1 and Q8, there is a time period during which the operating circuit of the first phase H-bridge converter does not pass through R1, and the operating circuits of the second and third phase H-bridge converters both pass through R1. This time period includes the midpoint of the turn-off period of Q1 and Q8. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the inductor current value of the first phase H-bridge converter as the difference between the current value of R1 at the first moment and the current value of R1 at the second moment. Here, the first moment can be the midpoint of the conduction period of Q1 and Q8, and the second moment can be the midpoint of the turn-off period of Q1 and Q8.

[0151] Similarly, during the conduction period of Q3 and Q10, there is a time period during which the operating circuits of all H-bridge converters pass through R1. This time period includes the midpoint of the conduction period of Q3 and Q10. During the turn-off period of Q3 and Q10, the operating circuit of the second-phase H-bridge converter does not pass through R1, and the operating circuits of the first-phase and third-phase H-bridge converters both pass through R1. This time period includes the midpoint of the turn-off period of Q3 and Q10. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the difference between the current value of R1 at the first moment and the current value of R1 at the second moment as the inductor current value of the second-phase H-bridge converter. Here, the first moment can be the midpoint of the conduction period of Q3 and Q10, and the second moment can be the midpoint of the turn-off period of Q3 and Q10.

[0152] Furthermore, since the current values ​​of R1 at the midpoint of the conduction periods of Q1 and Q8 and at the midpoint of the conduction periods of Q3 and Q10 are equal, representing the total current of the three-phase H-bridge converter, the processing module 41 can obtain the current value of R1 at the second moment. The difference between the current value of R1 at the first moment and the current value of R1 at the second moment is determined as the inductor current value of the second-phase H-bridge converter. The first moment can be the midpoint of the conduction period of Q1 and Q8, and the second moment can be the midpoint of the turn-off period of Q3 and Q10. This reduces the number of samplings and improves efficiency.

[0153] Similarly, during the conduction period of Q5 and Q12, there is a time period during which the operating circuits of all H-bridge converters pass through R1. This time period includes the midpoint of the conduction period of Q5 and Q12. During the turn-off period of Q5 and Q12, the operating circuit of the third-phase H-bridge converter does not pass through R1, and the operating circuits of the first-phase and second-phase H-bridge converters both pass through R1. This time period includes the midpoint of the turn-off period of Q5 and Q12. The processing module 41 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the inductor current value of the third-phase H-bridge converter as the difference between the current value of R1 at the first moment and the current value of R1 at the second moment. Here, the first moment can be the midpoint of the conduction period of Q5 and Q12, and the second moment can be the midpoint of the turn-off period of Q5 and Q12.

[0154] Furthermore, since the current values ​​of R1 at the midpoint of the conduction periods of Q1 and Q8 and at the midpoint of the conduction periods of Q5 and Q12 are equal, representing the total current of the three-phase H-bridge converter, the processing module 41 can obtain the current value of R1 at the second moment. The difference between the current value of R1 at the first moment and the current value of R1 at the second moment is determined as the inductor current value of the third-phase H-bridge converter. The first moment can be the midpoint of the conduction period of Q1 and Q8, and the second moment can be the midpoint of the turn-off period of Q5 and Q12. This reduces the number of sampling operations and improves efficiency.

[0155] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0156] In the first moment, when the processing module 41 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor; in the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor; the difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0157] In another embodiment, the sampling module 40 is used to collect the current of the first sampling resistor R2, and the processing module 41 is used to obtain the current of R2 at a first time and the current of R2 at a second time, and determine the difference between the current of R2 at the first time and the current of R2 at the second time as the inductor current of the first phase H-bridge converter. Specifically, at the first time, the operating circuits of all three phases of the H-bridge converter pass through R2; at the second time, the operating circuit of the first phase H-bridge converter does not pass through R2; and the operating circuits of the second and third phases of the H-bridge converter both pass through R2. For example, if the first time is the midpoint of the conduction period of the switch in the first phase H-bridge converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase H-bridge converter; if the first time is the midpoint of the turn-off period of the switch in the first phase H-bridge converter, then the second time is the midpoint of the conduction period of the same switch in the first phase H-bridge converter.

[0158] Specifically, during the conduction periods of Q2 and Q7, L1 in the first-phase H-bridge converter is in a discharging state, and the energy stored in L1 can supply power to the load through the working circuit of the first-phase H-bridge converter composed of L1, Q7, R2, and Q2. During the conduction periods of Q2 and Q7, there is a period during which Q4 and Q9 are in a conducting state, which includes the midpoint of the conduction period of Q2 and Q7. During this period, L2 in the second-phase H-bridge converter is in a discharging state, and the energy stored in L2 can supply power to the load through the working circuit of the second-phase H-bridge converter composed of L2, Q9, R2, and Q4. During the conduction periods of Q2 and Q7, there is a period during which Q6 and Q11 are in a conducting state, which includes the midpoint of the conduction period of Q2 and Q7. During this period, L3 in the third-phase H-bridge converter is in a discharging state, and the energy stored in L3 can supply power to the load through the working circuit of the third-phase H-bridge converter composed of L3, Q11, R2, and Q6.

[0159] During the off-state of Q2 and Q7, Q1 and Q8 are in the on-state, and L1 in the first-phase H-bridge converter is in the charging state. The current flowing from the positive terminal of Vin reaches L1 through Q1, and then from L1 through Q8 to the negative terminal of Vin, forming the working circuit of the first-phase H-bridge converter. Vin stores energy for L1 through the working circuit of the first-phase H-bridge converter. During the off-state of Q2 and Q7, there is a period when Q4 and Q9 are in the on-state, which includes the midpoint of the off-state of Q2 and Q7. During this period, L2 in the second-phase H-bridge converter is in the discharging state. During the off-state of Q2 and Q7, there is a period when Q6 and Q11 are in the on-state, which includes the midpoint of the off-state of Q2 and Q7. During this period, L3 in the third-phase H-bridge converter is in the discharging state.

[0160] It is understood that during the conduction period of Q2 and Q7, there is a time period during which the operating circuits of all H-bridge converters pass through R2. This time period includes the midpoint of the conduction period of Q2 and Q7. During the turn-off period of Q2 and Q7, there is a time period during which the operating circuit of the first phase H-bridge converter does not pass through R2, and the operating circuits of the second and third phase H-bridge converters both pass through R2. This time period includes the midpoint of the turn-off period of Q2 and Q7. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the first phase H-bridge converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. Here, the first moment can be the midpoint of the conduction period of Q2 and Q7, and the second moment can be the midpoint of the turn-off period of Q2 and Q7.

[0161] Similarly, during the conduction period of Q4 and Q9, there is a time period during which the operating circuits of all H-bridge converters pass through R2. This time period includes the midpoint of the conduction period of Q4 and Q9. During the turn-off period of Q4 and Q9, the operating circuit of the second-phase H-bridge converter does not pass through R2, and the operating circuits of the first-phase and third-phase H-bridge converters both pass through R2. This time period includes the midpoint of the turn-off period of Q4 and Q9. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the second-phase H-bridge converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. Here, the first moment can be the midpoint of the conduction period of Q4 and Q9, and the second moment can be the midpoint of the turn-off period of Q4 and Q9.

[0162] Furthermore, since the current values ​​of R2 at the midpoints of the conduction periods of Q2 and Q7 and the midpoints of the conduction periods of Q4 and Q9 are equal, representing the total current of the three-phase H-bridge converter, the processing module 41 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the second-phase H-bridge converter. The first moment can be the midpoint of the conduction period of Q2 and Q7, and the second moment can be the midpoint of the turn-off period of Q4 and Q9. This reduces the number of sampling operations and improves efficiency.

[0163] Similarly, during the conduction period of Q6 and Q11, there is a time period during which the operating circuits of all H-bridge converters pass through R2. This time period includes the midpoint of the conduction period of Q6 and Q11. During the turn-off period of Q6 and Q11, the operating circuit of the third-phase H-bridge converter does not pass through R2. Furthermore, the operating circuits of the first-phase and second-phase H-bridge converters both pass through R2. This time period includes the midpoint of the turn-off period of Q6 and Q11. The processing module 41 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the difference between the current value of R2 at the first moment and the current value of R2 at the second moment as the inductor current value of the third-phase H-bridge converter. Here, the first moment can be the midpoint of the conduction period of Q6 and Q11, and the second moment can be the midpoint of the turn-off period of Q6 and Q11.

[0164] Furthermore, since the current values ​​of R2 at the midpoints of the conduction periods of Q2 and Q7 and the midpoints of the conduction periods of Q6 and Q11 are equal, representing the total current of the three-phase H-bridge converter, the processing module 41 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the third-phase H-bridge converter. The first moment can be the midpoint of the conduction period of Q2 and Q7, and the second moment can be the midpoint of the turn-off period of Q6 and Q11. This reduces the number of samplings and improves efficiency.

[0165] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0166] In the first moment, when the processing module 41 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor; in the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor; the difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0167] In this embodiment of the application, when the working circuit of the first phase H-bridge converter passes through the first sampling resistor R1 or R2 at the first moment, and the working circuits of the second phase H-bridge converter and the third phase H-bridge converter both pass through the first sampling resistor, the processing module 41 determines the inductor current value of the first phase H-bridge converter by the difference between the current value of the first sampling resistor at the first moment and the current value of the first sampling resistor at the second moment.

[0168] For example, see Figure 5 , Figure 5 This is a schematic diagram of the power supply structure provided in this application, which employs a three-phase interleaved parallel Buck-Boost converter. (See attached diagram.) Figure 5As shown, the power supply includes Vin, a three-phase interleaved parallel Buck-Boost converter, and a current sampling device. The three-phase interleaved parallel Buck-Boost converter includes phase 1 to phase 3 Buck-Boost converters. Phase 1 Buck-Boost converter includes transistors Q1 and Q2 and a power inductor L1; phase 2 Buck-Boost converter includes transistors Q3 and Q4 and a power inductor L2; and phase 3 Buck-Boost converter includes transistors Q5 and Q6 and a power inductor L3. The three-phase Buck-Boost converters are connected in parallel via in1, in2, out1, and out2. Furthermore, the three-phase parallel Buck-Boost converters are connected to a first sampling resistor, which can be either R1 or R2. That is, the current sampling device in this embodiment can include R1 / R2. In addition, the current sampling device in this embodiment may also include a sampling module 50 and a processing module 51. The processing module 51 is used to output control signals with a phase difference of 120° to the switching transistors (such as Q1 and Q3) at the same position of any two phases of the three-phase Buck-Boost converter.

[0169] Q1-Q6 can be switching transistors including but not limited to MOSFETs, IGBTs, diodes, and transistors. L1, L2, and L3 can be independent inductors or three-phase integrated inductors.

[0170] In one embodiment, the sampling module 50 is used to collect the current of the first sampling resistor R1, and the processing module 51 is used to obtain the current of R1 at a first time and the current of R1 at a second time, and determine the difference between the current of R1 at the first time and the current of R1 at the second time as the inductor current of the first phase Buck-Boost converter. Specifically, at the first time, the operating circuits of all three phase Buck-Boost converters pass through R1; at the second time, the operating circuit of the first phase Buck-Boost converter does not pass through R1; and the operating circuits of the second and third phase Buck-Boost converters both pass through R1. For example, if the first time is the midpoint of the conduction period of the switch in the first phase Buck-Boost converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase Buck-Boost converter; if the first time is the midpoint of the turn-off period of the switch in the first phase Buck-Boost converter, then the second time is the midpoint of the conduction period of the same switch in the first phase Buck-Boost converter.

[0171] Specifically, during the conduction period of Q1, L1 in the first-phase Buck-Boost converter is in a charging state. The current flowing from the positive terminal of Vin reaches L1 through Q1, and then from L1 through R1 to the negative terminal of Vin, forming the working circuit of the first-phase Buck-Boost converter. Vin stores energy for L1 through the working circuit of the first-phase Buck-Boost converter. During the conduction period of Q1, there is a period when Q3 is in a conducting state. This period includes the midpoint of the conduction period of Q1, during which L2 in the second-phase Buck-Boost converter is in a charging state. The current flowing from the positive terminal of Vin reaches L2 through Q3, and then from L2 through R1 to the negative terminal of Vin. The current from Q1 reaches the negative terminal of Vin, forming the working circuit of the second-phase Buck-Boost converter. Vin stores energy for L2 through the working circuit of the second-phase Buck-Boost converter. During the conduction period of Q1, there is a period when Q5 is in the conduction state. During this period, there is a midpoint of the conduction period of Q1. L3 in the third-phase Buck-Boost converter is in the charging state. The current flowing out of the positive terminal of Vin reaches L3 through Q5, and then from L3 through R1 to the negative terminal of Vin, forming the working circuit of the third-phase Buck-Boost converter. Vin stores energy for L3 through the working circuit of the third-phase Buck-Boost converter.

[0172] During the off period of Q1, Q2 is in the on state, and L1 in the first phase Buck-Boost converter is in the discharging state. The energy stored in L1 can supply power to the load through the working circuit of the first phase H-bridge converter composed of L1 and Q2. During the off period of Q1, there is a period when Q3 is in the on state, which includes the midpoint of the off period of Q1. During this period, L2 in the second phase Buck-Boost converter is in the charging state. When Q1 is in the off state, there is a period when Q5 is in the on state, which includes the midpoint of the off period of Q1. During this period, L3 in the third phase Buck-Boost converter is in the charging state.

[0173] It is understood that during the Q1 turn-on period, there is a time interval during which the operating circuits of all Buck-Boost converters pass through R1, and this time interval includes the midpoint of the Q1 turn-on period. During the Q1 turn-off period, there is a time interval during which the operating circuits of the first-phase Buck-Boost converter do not pass through R1, while the operating circuits of the second-phase and third-phase Buck-Boost converters both pass through R1, and this time interval includes the midpoint of the Q1 turn-off period. The processing module 51 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the inductor current value of the first-phase Buck-Boost converter as the difference between the current value of R1 at the first moment and the current value of R1 at the second moment. The first moment can be the midpoint of the Q1 turn-on period, and the second moment can be the midpoint of the Q1 turn-off period.

[0174] Similarly, during the Q3 turn-on period, there is a time interval during which all Buck-Boost converter operating circuits pass through R1, and this time interval includes the midpoint of the Q3 turn-on period. During the Q3 turn-off period, there is a time interval during which the operating circuit of the second-phase Buck-Boost converter does not pass through R1, and the operating circuits of the first-phase and third-phase Buck-Boost converters both pass through R1, and this time interval includes the midpoint of the Q3 turn-off period. The processing module 51 can obtain the current value of R1 at the first time and the current value of R1 at the second time, and determine the inductor current value of the second-phase Buck-Boost converter as the difference between the current value of R1 at the first time and the current value of R1 at the second time. The first time can be the midpoint of the Q3 turn-on period, and the second time can be the midpoint of the Q3 turn-off period.

[0175] During the Q5 conduction period, there is a time interval during which the operating circuits of all Buck-Boost converters pass through R1. This time interval includes the midpoint of the Q5 conduction period. During the Q5 turn-off period, the operating circuit of the third-phase Buck-Boost converter does not pass through R1, while the operating circuits of the first-phase and second-phase Buck-Boost converters both pass through R1. This time interval includes the midpoint of the Q5 turn-off period. The processing module 51 can obtain the current value of R1 at the first moment and the current value of R1 at the second moment, and determine the inductor current value of the third-phase Buck-Boost converter as the difference between the current values ​​of R1 at the first moment and the current values ​​of R1 at the second moment. The first moment can be the midpoint of the Q5 conduction period, and the second moment can be the midpoint of the Q5 turn-off period.

[0176] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0177] In the first moment, when the processing module 51 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor; in the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor; the difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the input terminal of the multiphase interleaved parallel converter.

[0178] In another embodiment, the sampling module 50 is used to collect the current of the first sampling resistor R2, and the processing module 51 is used to obtain the current of R2 at a first time and the current of R2 at a second time, and determine the difference between the current of R2 at the first time and the current of R2 at the second time as the inductor current of the first phase Buck-Boost converter. Specifically, at the first time, the operating circuits of all three phase Buck-Boost converters pass through R2; at the second time, the operating circuit of the first phase Buck-Boost converter does not pass through R2; and the operating circuits of the second and third phase Buck-Boost converters both pass through R2. For example, if the first time is the midpoint of the conduction period of the switch in the first phase Buck-Boost converter, then the second time is the midpoint of the turn-off period of the same switch in the first phase Buck-Boost converter; if the first time is the midpoint of the turn-off period of the switch in the first phase Buck-Boost converter, then the second time is the midpoint of the conduction period of the same switch in the first phase Buck-Boost converter.

[0179] Specifically, during the conduction period of Q2, L1 in the first-phase Buck-Boost converter is in a discharging state, and the energy stored in L1 can supply power to the load through the working circuit of the first-phase Buck-Boost converter composed of L1, Q2, and R2. During the conduction period of Q2, there is a period when Q4 is in a conducting state, which is the midpoint of the conduction period of Q2. During this period, L2 in the second-phase Buck-Boost converter is in a discharging state, and the energy stored in L2 can supply power to the load through the working circuit of the second-phase Buck-Boost converter composed of L2, Q4, and R2. During the conduction period of Q2, there is a period when Q6 is in a conducting state, which is the midpoint of the conduction period of Q2. During this period, L3 in the third-phase Buck-Boost converter is in a discharging state, and the energy stored in L3 can supply power to the load through the working circuit of the third-phase Buck-Boost converter composed of L3, Q6, and R2.

[0180] During the Q2 off period, Q1 is in the on state, and L1 in the first phase Buck-Boost converter is in the charging state. The current flowing from the positive terminal of Vin goes through Q1 to L1, and then from L1 to the negative terminal of Vin, forming the working circuit of the first phase Buck-Boost converter. Vin stores energy for L1 through the working circuit of the first phase Buck-Boost converter. During the Q2 off period, there is a time when Q4 is in the on state, which is the midpoint of the Q2 off period. During this time, L2 in the second phase Buck-Boost converter is in the discharging state. During the Q2 off period, there is a time when Q6 is in the on state, which is the midpoint of the Q2 off period. During this time, L3 in the third phase Buck-Boost converter is in the discharging state.

[0181] It is understood that during the Q2 turn-on period, there is a time interval during which the operating circuits of all Buck-Boost converters pass through R2, and this time interval includes the midpoint of the Q2 turn-on period. During the Q2 turn-off period, there is a time interval during which the operating circuits of the first-phase Buck-Boost converter do not pass through R2, and the operating circuits of the second-phase and third-phase Buck-Boost converters both pass through R2, and this time interval includes the midpoint of the Q2 turn-off period. The processing module 51 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the first-phase Buck-Boost converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. The first moment can be the midpoint of the Q2 turn-on period, and the second moment can be the midpoint of the Q2 turn-off period.

[0182] Similarly, during the Q4 conduction period, there is a time interval during which all Buck-Boost converter operating circuits pass through R2, and this time interval includes the midpoint of the Q4 conduction period. During the Q4 turn-off period, there is a time interval during which the operating circuit of the second-phase Buck-Boost converter does not pass through R2, and the operating circuits of the first-phase and third-phase Buck-Boost converters both pass through R2, and this time interval includes the midpoint of the Q4 turn-off period. The processing module 51 can obtain the current value of R2 at the first time and the current value of R2 at the second time, and determine the inductor current value of the second-phase Buck-Boost converter as the difference between the current value of R2 at the first time and the current value of R2 at the second time. The first time can be the midpoint of the Q4 conduction period, and the second time can be the midpoint of the Q4 turn-off period.

[0183] Furthermore, since the current values ​​of R2 at the midpoint of Q2's conduction period and at the midpoint of Q4's conduction period are equal, representing the total current of the three-phase Buck-Boost converter, the processing module 51 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the second-phase Buck-Boost converter. The first moment can be the midpoint of Q2's conduction period, and the second moment can be the midpoint of Q4's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0184] Similarly, during the Q6 conduction period, there is a time interval during which all Buck-Boost converter operating circuits pass through R2, and this time interval includes the midpoint of the Q6 conduction period. During the Q6 turn-off period, the operating circuit of the third-phase Buck-Boost converter does not pass through R2, and the operating circuits of the first-phase and second-phase Buck-Boost converters both pass through R2, and this time interval includes the midpoint of the Q6 turn-off period. The processing module 51 can obtain the current value of R2 at the first moment and the current value of R2 at the second moment, and determine the inductor current value of the third-phase Buck-Boost converter as the difference between the current value of R2 at the first moment and the current value of R2 at the second moment. The first moment can be the midpoint of the Q6 conduction period, and the second moment can be the midpoint of the Q6 turn-off period.

[0185] Furthermore, since the current values ​​of R2 at the midpoint of Q2's conduction period and at the midpoint of Q6's conduction period are equal, representing the total current of the three-phase Buck-Boost converter, the processing module 51 can obtain the current value of R2 at the second moment. The difference between the current value of R2 at the first moment and the current value of R2 at the second moment is determined as the inductor current value of the third-phase Buck-Boost converter. The first moment can be the midpoint of Q2's conduction period, and the second moment can be the midpoint of Q6's turn-off period. This reduces the number of sampling operations and improves efficiency.

[0186] Based on the aforementioned power supply, this application also provides a current sampling method, including:

[0187] In the first moment, when the processing module 51 determines that the working circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor, it obtains the first current of the first sampling resistor. In the second moment, when the working circuit of the first phase converter does not pass through the first sampling resistor, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, it obtains the second current of the first sampling resistor. The difference between the first current and the second current of the first sampling resistor is determined as the inductor current of the first phase converter, wherein the first sampling resistor is connected to the output terminal of the multiphase interleaved parallel converter.

[0188] In this embodiment of the application, when the processing module 51 determines the inductor current value of the first phase Buck-Boost converter by the difference between the current value of the first sampling resistor at the first moment and the current value of the first sampling resistor at the second moment, not only the working circuit of the first phase Buck-Boost converter passes through the first sampling resistor R1 or R2, but also the working circuits of the second phase Buck-Boost converter and the third phase Buck-Boost converter.

[0189] The power supply and corresponding current sampling method provided in this application can both reduce the circuit cost of the current sampling device and increase support for DC current sampling of multiphase interleaved parallel converters, making it highly applicable.

[0190] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A power supply, characterized by, The power supply includes an input power supply, a multiphase interleaved parallel converter, and a current sampling device. The input power supply is used to supply power to the input terminal of the multiphase interleaved parallel converter. The multiphase interleaved parallel converter includes at least two phase converters connected in parallel. The current sampling device is connected to the switching transistors of each phase converter in the at least two phase converters connected in parallel. The current sampling device includes a first sampling resistor, which is connected to the input terminal or the output terminal of the multiphase interleaved parallel converter. The at least two phase converters connected in parallel include a first phase converter. When all the working circuits of the multiphase interleaved parallel converter pass through the first sampling resistor at the first moment, and when the working circuit of the first phase converter does not pass through the first sampling resistor at the second moment, and the working circuits of the other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor, the current sampling device is used to collect the first current of the first sampling resistor at the first moment, collect the second current of the first sampling resistor at the second moment, and determine the difference between the first current of the first sampling resistor at the first moment and the second current of the first sampling resistor at the second moment as the inductor current of the first phase converter.

2. The power supply of claim 1, wherein, The current sampling device includes a sampling module and a processing module, wherein: The sampling module is used to collect the first current of the first sampling resistor at the first moment and the second current of the first sampling resistor at the second moment. The processing module is used to determine the difference between the first current of the first sampling resistor at the first time and the second current of the first sampling resistor at the second time as the inductor current of the first phase converter.

3. The power supply of claim 1 or 2, wherein, The first phase converter is any one of an H-bridge converter, a Buck converter, a Boost converter, and a Buck-Boost converter.

4. A current sampling method, characterized by, The current sampling method is applicable to a power supply, which includes an input power supply, a multiphase interleaved parallel converter, and a current sampling device. The input power supply supplies power to the input terminal of the multiphase interleaved parallel converter, which includes at least two phases connected in parallel. The current sampling device is connected to the switching transistors of each phase converter in the at least two phases connected in parallel. The current sampling device includes a first sampling resistor connected to either the input or output terminal of the multiphase interleaved parallel converter. The at least two phases connected in parallel include a first phase converter. The method includes: At the first moment, the operating circuits of all converters in the multiphase interleaved parallel converter pass through the first sampling resistor. At the second moment, the operating circuit of the first phase converter does not pass through the first sampling resistor, and the operating circuits of other converters in the multiphase interleaved parallel converter all pass through the first sampling resistor. The current sampling device collects the first current of the first sampling resistor at the second moment, collects the second current of the first sampling resistor at the second moment, and determines the difference between the first current of the first sampling resistor at the first moment and the second current of the first sampling resistor at the second moment as the inductor current of the first phase converter.

5. The method of claim 4, wherein, The first phase converter is any one of an H-bridge converter, a Buck converter, a Boost converter, and a Buck-Boost converter.

Images