CN111769540A - Current sharing circuit of parallel power supply, power supply module and integrated circuit test system - Google Patents

Abstract

The application relates to a current equalizing circuit, a power supply module and an integrated circuit testing system of parallel power supplies. Wherein, this parallel power supply's current-sharing circuit includes: the device comprises a main direct current power supply module, a slave direct current power supply module, a main current detection module and a slave current detection module; the slave direct current power supply module comprises a slave current adjusting unit; the input end of the main current detection module is electrically connected to the output end of the main direct current power supply module, and the output end of the main current detection module is electrically connected to the first input end of the slave current adjustment unit; the input end of the slave current detection module is electrically connected to the output end of the slave direct-current power supply module, and the output end of the slave current detection module is electrically connected to the second input end of the slave current adjusting unit; the slave current adjusting unit is used for adjusting the output current of the slave direct current power supply module according to the current difference value between the current value detected by the main current detecting module and the current value detected by the slave current detecting module. Through the application, the power loss of the parallel power supply is reduced.

Description

Current sharing circuit of parallel power supply, power supply module and integrated circuit test system

technical field

The present application relates to the field of power supply current sharing, in particular to a parallel power supply current sharing circuit, a power supply module and an integrated circuit test system.

Background technique

With the development and application of power electronic technology, the power supply system has higher and higher requirements for high-power power supply systems. In the actual application process, the output power and reliability of a single DC power supply cannot meet the user's requirements. Once a single power supply fails , the power supply system is paralyzed and cannot operate. The parallel operation of multiple power modules can meet different output power requirements, and their capacity can be flexibly expanded according to actual needs, and it is easy to realize the redundancy of the power supply system. reliability of the power system.

In the related art, when multiple power supplies are connected in parallel, the output voltage of each parallel power supply is usually controlled by voltage feedback. However, in the process of research, it was found that due to the differences in the parameters such as the internal resistance of each power supply in the parallel power supply, when the output voltage of each parallel power supply was controlled by voltage feedback, the output current of each power supply was inconsistent, resulting in a circulating current between the power supplies. In turn, the power loss of the power supply increases.

Aiming at the problem of large power loss of parallel power supplies in the related art, no effective solution has been proposed yet.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a current sharing circuit, a power supply module, and an integrated circuit testing system for parallel power supplies, so as to at least solve the problem of large power loss of parallel power supplies in the related art.

In a first aspect, an embodiment of the present application provides a current sharing circuit for parallel power supplies, where the current sharing circuit for parallel power supplies includes: a master DC power supply module, a slave DC power supply module, a master current detection module, and a slave current detection module, so The output end of the master DC power module is electrically connected to the output end of the slave DC power module; the slave DC power module includes a slave current adjustment unit; the input end of the master current detection module is electrically connected to the master The output end of the DC power supply module, the output end of the master current detection module is electrically connected to the first input end of the slave current adjustment unit; the input end of the slave current detection module is electrically connected to the slave DC power supply the output end of the module, the output end of the slave current detection module is electrically connected to the second input end of the slave current adjustment unit; the slave current adjustment unit is used for the current value detected by the master current detection module The output current of the slave DC power supply module is adjusted according to the current difference value between the current value detected by the slave current detection module and the slave current detection module.

In some of these embodiments, the main current detection module includes a main sampling resistor and a main sampling voltage detection unit, the main sampling resistor is connected in series with the output end of the main DC power supply module, and the main sampling voltage detection unit is used for Detect the voltage value at both ends of the master sampling resistor; the slave current detection module includes a slave sampling resistor and a slave sampling voltage detection unit, the slave sampling resistor is connected in series with the output end of the slave DC power supply module, and the slave sampling voltage The detection unit is used to detect the voltage value across the slave sampling resistor.

In some of these embodiments, the resistance values of the master sampling resistor and the slave sampling resistor are the same; and/or the accuracy of the master sampling resistor and the slave sampling resistor are not lower than 0.25%, and the temperature drift is not lower than 0.25%. above 25ppm.

In some of the embodiments, the main DC power module includes a main voltage adjustment unit and a main voltage detection unit, two detection ends of the main voltage detection unit are electrically connected to two ends of the load, and the main voltage detection unit The output terminal of the main voltage adjustment unit is electrically connected to the first input terminal of the main voltage adjustment unit, the second input terminal of the main voltage adjustment unit is electrically connected to the voltage control terminal, and the voltage on the voltage control terminal is the set voltage value; the output terminal of the main voltage adjustment unit is electrically connected to one end of the load, and the other end of the load is electrically connected to the ground terminal; the main voltage adjustment unit is used for detecting according to the main voltage detection unit The voltage difference between the obtained voltage value and the set voltage value of the voltage control terminal is used to adjust the output voltage of the main DC power supply module.

In some of the embodiments, the master sampling voltage detection unit and the slave sampling voltage detection unit are both comparators, and the master voltage adjustment unit is a power amplifier.

In some of the embodiments, the main voltage adjustment unit is a power amplifier, and the main voltage detection unit is a comparator.

In some of the embodiments, the master DC power module and the slave DC power module are respectively powered by independent power chips.

In some of the embodiments, the current sharing circuit of the parallel power supply further includes a first switch unit, the first switch unit is connected in series between the output end of the master DC power supply module and the output end of the slave DC power supply module between.

In some embodiments, the number of the slave DC power modules is multiple, and the output terminals of the multiple slave DC power modules are respectively electrically connected to the output terminals of the master DC power module.

In some of the embodiments, the current sharing circuit of the parallel power supply further includes a plurality of second switch units, the plurality of second switch units are respectively connected in series with the output end of the master DC power supply module and each slave DC power supply between the outputs of the module.

In a second aspect, an embodiment of the present application further provides a power supply module, the power supply module includes: a PCB board, a power supply interface unit, and the current sharing circuit of the parallel power supply according to the first aspect; the power supply interface unit and the The current sharing circuit of the parallel power supply is arranged on the PCB board, and the output end of the current sharing circuit of the parallel power supply is connected in parallel to the power supply interface unit.

In some of the embodiments, the power supply module includes a plurality of current sharing circuits for the parallel power supplies; the power supply module further includes: a third switch unit, the third switch unit is disposed on the PCB board, and the The third switch unit is connected in series between the power supply interface unit and the output terminals of the current sharing circuits of the multiple parallel power supplies, and the third switching unit is used to control the output terminals of the current sharing circuits of each parallel power supply respectively. On-off with the power supply interface unit.

In a third aspect, an embodiment of the present application further provides an integrated circuit testing system, where the integrated circuit testing system includes the power supply module according to the second aspect.

Compared with the related art, the parallel power supply current sharing circuit, the power supply module and the integrated circuit test system provided by the embodiments of the present application, by setting the main DC power supply module, the secondary DC power supply module, the main current detection system in the current sharing circuit of the parallel power supply. The module and the slave current detection module, the output end of the master DC power supply module is electrically connected with the output end of the slave DC power supply module; the slave DC power supply module includes a slave current adjustment unit; the input end of the master current detection module is electrically connected to the master DC power supply The output end of the module, the output end of the main current detection module is electrically connected to the first input end of the slave current adjustment unit; the input end of the slave current detection module is electrically connected to the output end of the slave DC power supply module, and the output end of the slave current detection module The output terminal is electrically connected to the second input terminal of the slave current adjustment unit; the slave current adjustment unit is used for adjusting the current value according to the current difference between the current value detected by the master current detection module and the current value detected by the slave current detection module The method of outputting current from the DC power supply module solves the problem of large power loss of the parallel power supply in the related art, and reduces the power loss of the parallel power supply.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below in order to make other features, objects and advantages of the application more apparent.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a structural block diagram of a current sharing circuit of a parallel power supply according to an embodiment of the present application;

FIG. 2 is a topological structure diagram of a current sharing circuit of a parallel power supply according to a preferred embodiment of the present application;

3 is a structural block diagram of a power module according to an embodiment of the present application;

FIG. 4 is a topological structure diagram of a power module according to a preferred embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

Reference in this application to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

Unless otherwise defined, the technical or scientific terms involved in this application shall have the usual meanings understood by those with ordinary skill in the technical field to which this application belongs. Words such as "a", "an", "an", "the" and the like mentioned in this application do not denote a quantitative limitation, and may denote the singular or the plural. The terms "comprising", "comprising", "having" and any of their variants referred to in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or process comprising a series of steps or modules (units) The apparatus is not limited to the steps or units listed, but may further include steps or units not listed, or may further include other steps or units inherent to the process, method, product or apparatus. Words like "connected," "connected," "coupled," and the like referred to in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" referred to in this application refers to two or more. "And/or" describes the association relationship between associated objects, indicating that there can be three kinds of relationships. For example, "A and/or B" can mean that A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the associated objects are an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only to distinguish similar objects, and do not represent a specific order for the objects.

This embodiment provides a current sharing circuit of parallel power supplies. 1 is a structural block diagram of a current sharing circuit of a parallel power supply according to an embodiment of the present application. As shown in FIG. 1 , the current sharing circuit of the parallel power supply includes: a master DC power supply module 10 , a slave DC power supply module 30 , and a master current detection module 20 and the slave current detection module 40, the output terminal of the master DC power module 10 is electrically connected to the output terminal of the slave DC power module 30; the slave DC power module 30 includes a slave current adjustment unit 31; the input terminal of the master current detection module 20 is electrically connected is electrically connected to the output terminal of the master DC power supply module 10, the output terminal of the master current detection module 20 is electrically connected to the first input terminal of the slave current adjustment unit 31; the input terminal of the slave current detection module 40 is electrically connected to the slave DC power supply The output end of the module 30 is electrically connected to the output end of the slave current detection module 40 to the second input end of the slave current adjustment unit 31; the slave current adjustment unit 31 is used for the current value detected by the master current detection module 20 and the slave current The current difference between the current values detected by the detection module 40 adjusts the output current from the DC power module 30 .

Compared with the related art, in this embodiment, the main current detection module 20 detects the current value output by the main DC power supply module 10, and the slave current detection module 40 detects the current value output from the DC power supply module 30, and then according to the main current detection module 20 The current difference between the detected current value and the current value detected from the current detection module 40 is used to adjust the output current mode from the DC power supply module 30, without the need to control the output voltage of each parallel power supply through voltage feedback, directly by The main DC power module 10 and the output current from the DC power module 30 are used as feedback, which solves the problem of large power loss of the parallel power supply in the related art, and reduces the power loss of the parallel power supply.

The master DC power module 10 and the slave DC power module 30 in this embodiment may be DPSIC chips. The DPSIC chip can be integrated with a digital-to-analog converter DAC, a power amplifier, a comparator, and the like.

In some of the embodiments, the main current detection module 20 includes a main sampling resistor and a main sampling voltage detection unit, the main sampling resistor is connected in series with the output end of the main DC power supply module 10, and the main sampling voltage detection unit is used to detect the voltage between the two ends of the main sampling resistor. Voltage value; the slave current detection module 40 includes a slave sampling resistor and a slave sampling voltage detection unit, the slave sampling resistor is connected in series with the output end of the slave DC power supply module 30, and the slave sampling voltage detection unit is used to detect the voltage value across the slave sampling resistor.

In this embodiment, the main current detection module 20 includes a main sampling resistor and a main sampling voltage detection unit. The main sampling voltage detection unit detects the voltage difference between the two ends of the main sampling resistor. However, the current value of the main sampling resistor is determined according to the voltage difference, and then the current value of the main sampling resistor is determined. By determining the current value of the main DC power supply module 10 according to the current value of the main sampling resistor, the detection of the current value output by the main DC power supply module 10 is realized. And the slave current detection module 40 includes a slave sampling resistor and a slave sampling voltage detection unit, by detecting the voltage difference between the two ends of the slave sampling resistor from the sampling voltage detection unit, and then determining the current value of the slave sampling resistor according to the voltage difference, and then according to the slave sampling resistor. The way of determining the current value from the DC power supply module 30 realizes the detection of the current value output from the DC power supply module 30 .

In some of these embodiments, the resistance values of the master sampling resistor and the slave sampling resistor are the same.

In some of these embodiments, the accuracy of both the master sampling resistor and the slave sampling resistor is not less than 0.25%.

In some of these embodiments, the temperature drift of both the master sampling resistor and the slave sampling resistor is not higher than 25ppm.

In this embodiment, in order to ensure the current sharing effect of the master DC power module 10 and the slave DC power module 30, and the accuracy of the acquired current value output by the master DC power module 10 and the current value output from the slave DC power module 30 , the resistance value of the master sampling resistor and the slave sampling resistor are the same, and the master sampling resistor and the slave sampling resistor both use sampling resistors with an accuracy of not less than 0.25% and a temperature drift of not higher than 25ppm.

In order to ensure that the output voltages of the respective DC power modules are equal, in some embodiments, the main DC power module 10 includes a main voltage adjustment unit and a main voltage detection unit, and two detection ends of the main voltage detection unit are electrically connected to two terminals of the load. terminal, the output terminal of the main voltage detection unit is electrically connected to the first input terminal of the main voltage adjustment unit, the second input terminal of the main voltage adjustment unit is electrically connected to the voltage control terminal, and the voltage on the voltage control terminal is the set voltage The output terminal of the main voltage adjustment unit is electrically connected to one end of the load, and the other end of the load is electrically connected to the ground terminal; the main voltage adjustment unit is used to set the voltage value according to the voltage value detected by the main voltage detection unit and the voltage control terminal The voltage difference between the voltage values adjusts the output voltage of the main DC power module 10 .

In this embodiment, the voltage value detected by the main voltage detection unit is then adjusted by the voltage adjustment unit according to the voltage value detected by the main voltage detection unit and the voltage difference between the voltage on the voltage control terminal and the set voltage value. The mode of the output voltage of the master DC power supply module 10 can realize the voltage balance of the master DC power supply module 10 and the slave DC power supply module 30, ensure that the output voltage of each DC power supply module is equal, and at the same time improve the main DC power supply module 10 and the slave DC power supply. Balance accuracy of the output voltage of the power module 30 .

It should be noted that the voltage control terminal may be an output terminal of the digital-to-analog converter DAC, and the digital-to-analog converter DAC controls the output voltage of the main DC power module by outputting a voltage signal with a preset voltage value at the voltage control terminal.

In some of the embodiments, the master sampling voltage detection unit and the slave sampling voltage detection unit are both comparators, and the master voltage adjustment unit is a power amplifier. In this embodiment, by using the power amplifier to realize the voltage adjustment, the beneficial effect of the voltage of the master DC power supply module 10 and the slave DC power supply module 30 being equal can be achieved. And the voltage difference across the slave sampling resistor is determined by comparing the voltage across the slave sampling resistor through the comparator, thereby achieving the beneficial effect of detecting the current of the slave sampling resistor.

In some of the embodiments, the main voltage adjustment unit is a power amplifier, and the main voltage detection unit is a comparator. In this embodiment, by implementing the voltage adjustment method through the power amplifier, the output voltages of the master DC power supply module 10 and the slave DC power supply module 30 can be equalized. The voltage difference between the two ends of the main sampling resistor is determined by comparing the voltages across the main sampling resistor through the comparator, thereby achieving the beneficial effect of detecting the voltage of the main sampling resistor.

It should be noted that, the comparators in the above embodiments may be differential comparators.

In order to ensure that the output ripple of the master DC power module 10 and the slave DC power module 30 is small, in some embodiments, the master DC power module 10 and the slave DC power module 30 are powered by independent power chips respectively.

In this embodiment, the main DC power supply module 10 and the slave DC power supply module 30 are provided with independent power supply chips to supply power, so that the total output current ripple of the current sharing circuit of the parallel power supply can be reduced.

It should be noted that the power chip in this embodiment may be a packaged power chip, such as a power chip with a model of LTM8074. The power chip has the characteristics of small package, less peripheral circuits and small ripple, and can meet the requirements of multiple DC power channels. , high current and small ripple requirements.

In some of the embodiments, the current sharing circuit of the parallel power supply further includes a first switch unit, and the first switch unit is connected in series between the output end of the master DC power supply module 10 and the output end of the slave DC power supply module 30 . In this embodiment, by connecting the first switch unit in series between the output end of the master DC power supply module 10 and the output end of the slave DC power supply module 30, the connection between the master DC power supply module 10 and the slave DC power supply module 30 can be realized. Parallel on-off control.

In some of the embodiments, the number of the slave DC power modules 30 is multiple, and the output terminals of the multiple slave DC power modules 30 are electrically connected to the output terminals of the master DC power module 10 respectively; the current sharing circuit of the parallel power supply further includes A plurality of second switch units are respectively connected in series between the output end of the master DC power supply module 10 and the output end of each of the slave DC power supply modules 30 . In this embodiment, by connecting a plurality of second switching units in series between the output end of the master DC power supply module 10 and the output end of each slave DC power supply module 30, it is achieved that each slave DC power supply module 30 is connected in parallel with the main DC power supply module 10 for on-off control.

The current sharing circuit of the parallel power supply in the embodiment of the present application will be described below with reference to the accompanying drawings and preferred embodiments.

In this embodiment, the master DC power module 10 may be implemented by a packaged first DPSIC chip, and the slave DC power module 30 may be implemented by a packaged second DPSIC chip. In this case, the master voltage detection unit of the master current detection module 20 may be implemented by the first DPSIC chip, and the slave voltage detection unit of the slave current detection module 40 may also be implemented by the second DPSIC chip.

FIG. 2 is a topological structure diagram of a current sharing circuit of a parallel power supply according to a preferred embodiment of the present application. As shown in FIG. 2 , the current sharing circuit of the parallel power supply includes: a first DPSIC chip S1 (equivalent to the above-mentioned main DC power supply) module and the main voltage detection unit), the second DPSIC chip S2 (equivalent to the above-mentioned slave DC power supply module and the slave voltage detection unit), the main sampling resistor R1, the slave sampling resistor R2, the first LTM8074 power supply Q1, the second LTM8074 power supply Q2 .

The first DPSIC chip S1 includes: a digital-to-analog converter DAC (the digital-to-analog converter has the above-mentioned voltage control terminal), a first power amplifier G1 (equivalent to the above-mentioned main voltage adjustment unit), and a first differential comparator C1 (equivalent to the above-mentioned main voltage detection unit), a third differential comparator C3.

Wherein, the second DPSIC chip S2 includes: a second power amplifier G2 and a second differential comparator C2 (equivalent to the above-mentioned slave voltage detection unit).

The digital-to-analog converter is electrically connected to the positive input terminal of the first power amplifier; the negative input terminal of the first power amplifier is electrically connected to the output terminal of the third differential comparator, and the output terminal of the first power amplifier is electrically connected to One end of the main sampling resistor; one end of the main sampling resistor is also electrically connected to the positive input end of the first differential comparator, and the other end is electrically connected to the negative input end of the first differential comparator and the other end of the slave sampling resistor; The output terminal of the first differential comparator is electrically connected to the positive input terminal of the second power amplifier; the negative input terminal of the second power amplifier is electrically connected to the output terminal of the second differential comparator, and the output terminal of the second power amplifier is electrically connected to the output terminal of the second differential comparator. is electrically connected to one end of the second resistor; one end of the sampling resistor is also electrically connected to the positive input terminal of the second differential comparator, and the other end of the sampling resistor is also electrically connected to the negative input terminal of the second differential comparator; The negative input terminal of the third differential comparator is electrically connected to one end of the load R3 and grounded, and the positive input terminal of the third differential comparator is electrically connected to the other end of the main sampling resistor and the other end of the load R3 respectively; the first LTM8074 The power supply is electrically connected to the positive power supply terminal of the first power amplifier; the second LTM8074 power supply is electrically connected to the positive power supply terminal of the second power amplifier.

In this embodiment, the second DPSIC chip can take the current feedback of the first DPSIC chip as an input, but a power amplifier is used to compare and adjust the current feedback of the second DPSIC chip and the current feedback of the first DPSIC chip, so that The current output of the second DPSIC chip remains the same as the current output of the first DPSIC chip, which realizes the current sharing between the main DC power supply module and the slave DC power supply module, and does not need to control the output voltage of each parallel power supply through voltage feedback. In the technology, the power loss of the parallel power supply is large, and the power loss of the parallel power supply is reduced.

In the above embodiment, the power amplifier of each first DPSIC chip is powered by a separate LTM8074 power supply, which also reduces the ripple of the output current and improves the accuracy of the output current.

In this embodiment, the third differential comparator C3 is used to detect the voltage across the load R3, that is, the output voltage of the main DC power supply module. In order to improve the detection accuracy, the four-wire method is used to measure the voltage value of the load R3 in the embodiment of the present application. Referring to FIG. 2, the upper end of the load R3 is electrically connected to the output terminal HF of the main DC power supply module, the positive input terminal HS of the third differential comparator is also electrically connected to the upper end of the load R3, and the negative input terminal LS of the third differential comparator is electrically connected. The lower end of the load R3 is electrically connected to the lower end of the load R3, and the lower end of the load R3 is electrically connected to the ground terminal to form a loop. Using the above-mentioned four-wire connection method, the current between the two input terminals of the third differential comparator C3 is zero. Therefore, the voltage value measured by the third differential comparator C3 is the voltage across the load, without introducing The trace resistance improves the detection accuracy of the load voltage.

In the above embodiment, the second DPSIC chip measures the output current of the second DPSIC chip through the two-wire method, which can reduce the difficulty and cost of layout of the current sharing circuit of the parallel power supply.

In some of the embodiments, the current sharing circuit of the parallel power supply further includes a first switch unit, and the first switch unit is connected in series between the output end of the first DPSIC chip and the output end of the second DPSIC chip. Through the first switch unit, the on-off control between the output end of the second DPSIC chip and the output end of the first DPSIC chip is realized.

In some of the embodiments, the number of the second DPSIC chips is multiple, and the output terminals of the multiple second DPSIC chips are respectively electrically connected to the output terminals of the first DPSIC chip. Each second DPSIC chip has a maximum output current. In order to obtain a larger total output current, multiple second DPSIC chips can be provided, and the output terminals of the multiple second DPSIC chips can be electrically connected to the output terminals of the first DPSIC chip, so as to improve the current sharing circuit of the parallel power supply of load capacity.

In some of the embodiments, the current sharing circuit of the parallel power supply further includes a plurality of second switch units, and the plurality of second switch units are respectively connected in series between the output end of the first DPSIC chip and the output end of each second DPSIC chip , so as to realize the on-off control between the output end of each second DPSIC chip and the output end of the first DPSIC chip.

This embodiment also provides a power supply module. FIG. 3 is a structural block diagram of a power supply module according to an embodiment of the present application. As shown in FIG. 3 , the power supply module includes: a PCB board (not shown in the figure), a power supply interface unit 110 and the current sharing circuit 120 of the parallel power supply as in the above-mentioned embodiment; the power supply interface unit 110 and the current sharing circuit 120 of the parallel power supply are arranged on the PCB board, and the output end of the current sharing circuit 120 of the parallel power supply is connected in parallel to the power supply interface unit 110 .

In some of these embodiments, the power module includes a current sharing circuit 120 of a plurality of parallel power supplies. The power module further includes: a third switch unit 130, the third switch unit 130 is arranged on the PCB board, and the third switch unit 130 is connected in series between the power supply interface unit 110 and the output ends of the current sharing circuits 120 of the multiple parallel power supplies. The three switch units 130 are used to respectively control the on/off of the output end of the current sharing circuit 120 of each parallel power supply and the power supply interface unit 110 . By arranging a plurality of parallel power supply current sharing circuits in the power supply module, the load capacity of the power supply module can be further improved.

In the above embodiment, the third switch unit 130 controls the on-off mode of the output end of the current sharing circuit 120 of each parallel power supply and the power supply interface unit 110 respectively, so that the parallel state of the current sharing circuits 120 of the multiple parallel power supplies can be ensured Switching flexibility.

It should be noted that the switch unit in the embodiment of the present application may be a controllable switch unit, including but not limited to a relay, a switch tube or other controllable switch unit, and the switch unit in the embodiment of the present application may be composed of One or more switching devices. For example, the third switching unit 130 may be a multiplexer composed of a plurality of switching devices.

The description and illustration will be made below in conjunction with the accompanying drawings and the preferred embodiments.

FIG. 4 is a topological structure diagram of a power supply module according to a preferred embodiment of the present application. As shown in FIG. 4 , the power supply module includes: a current sharing circuit 120 of four parallel power supplies, a third switch unit 130 , and a power supply interface unit 110 , wherein, The current sharing circuit 120 of each parallel power supply can be provided with one master DC power supply module 10 and fifteen slave DC power supply modules 30, and the fifteen slave DC power supply modules 30 and the master DC power supply module 10 are all in parallel state, the master DC power supply The input terminal of the module 10 is the input terminal of the current sharing circuit 120 of the parallel power supply, and the output terminal of the main DC power supply module 10 is the output terminal of the current sharing circuit 120 of the parallel power supply; the input terminal of the current sharing circuit 120 of each parallel power supply and the The output ends are all electrically connected to the power supply interface unit 110 , and the third switch unit 130 is connected in series between the power supply interface unit 110 and the output ends of the current sharing circuits 120 of the multiple parallel power supplies. The power supply interface unit 110 may include multiple bus interfaces electrically connected to multiple buses, such as BUS1 , BUS2 , BUS3 and BUS4 shown in FIG. 4 , a total of four bus interfaces. Wherein, the bus interface of the power supply interface unit 110 is connected to the output end of the current sharing circuit of one or more parallel power supplies through the third switch unit 130 .

For convenience of description, the current sharing circuits of the four parallel power supplies may be the current sharing circuits of the first parallel power supply, the current sharing circuit of the second parallel power supply, the current sharing circuit of the third parallel power supply, and the current sharing circuit of the fourth parallel power supply. For example, to form two parallel output power modules with 32 DC power modules, the current sharing circuit of the first parallel power supply and the current sharing circuit of the second parallel power supply can be connected to BUS1, and the current sharing circuit of the third parallel power supply and the current sharing circuit of the second parallel power supply can be connected to BUS1. The current sharing circuit of the fourth parallel power supply is connected to BUS2, so that BUS1 and BUS2 are respectively connected to the output terminals of the current sharing circuits of the two parallel power supplies, so that two parallel output power supply modules with 32 DC power supply modules can be formed.

In some embodiments, the parallel output capability of a large current (eg, a current greater than or equal to 128A) can also be achieved by the above method.

Embodiments of the present application further provide an integrated circuit testing system, where the integrated circuit testing system includes the power module in the above-mentioned embodiments.

The above-mentioned power module can be applied to an integrated circuit test system, so as to improve the current output capability of the integrated circuit test system.

In the related art, when the integrated circuit test system needs to output a large current, it is necessary to insert another power chip capable of realizing high current into the chassis of the integrated circuit test system. the problem of poor flexibility.

In the present application, the power supply module is applied to the integrated circuit test system, and the current output capability of the integrated circuit test system can be changed by switching the parallel state of the current sharing circuit of the parallel power supply in the power supply module. For example, when a large current output is required, the current sharing circuits of the parallel power supplies in the power module can be switched to the parallel state, so as to realize the high current output of the integrated circuit test system, and there is no need to integrate another large current in the integrated circuit test system. It saves the cost, solves the problem of poor flexibility of the integrated circuit test system in the related art, and improves the flexibility of the integrated circuit test system.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the present application should be determined by the appended claims.

Claims (13)

1. The current sharing circuit of the parallel power supply is characterized by comprising the following components: the device comprises a main direct-current power supply module, a slave direct-current power supply module, a main current detection module and a slave current detection module, wherein the output end of the main direct-current power supply module is electrically connected with the output end of the slave direct-current power supply module; the slave direct current power supply module comprises a slave current adjusting unit;

the input end of the main current detection module is electrically connected to the output end of the main direct current power supply module, and the output end of the main current detection module is electrically connected to the first input end of the slave current adjustment unit;

the input end of the slave current detection module is electrically connected to the output end of the slave direct current power supply module, and the output end of the slave current detection module is electrically connected to the second input end of the slave current adjusting unit;

the slave current adjusting unit is used for adjusting the output current of the slave direct current power supply module according to the current difference value between the current value detected by the main current detecting module and the current value detected by the slave current detecting module.

2. The current sharing circuit for parallel power supplies according to claim 1,

the main current detection module comprises a main sampling resistor and a main sampling voltage detection unit, the main sampling resistor is connected in series with the output end of the main direct current power supply module, and the main sampling voltage detection unit is used for detecting the voltage values at two ends of the main sampling resistor;

the slave current detection module comprises a slave sampling resistor and a slave sampling voltage detection unit, the slave sampling resistor is connected in series with the output end of the slave direct current power supply module, and the slave sampling voltage detection unit is used for detecting the voltage value at two ends of the slave sampling resistor.

3. The current sharing circuit for parallel power supplies according to claim 2,

the resistance values of the master sampling resistor and the slave sampling resistor are the same; and/or

The precision of the main sampling resistor and the precision of the auxiliary sampling resistor are not lower than 0.25%, and the temperature drift is not higher than 25 ppm.

4. The current sharing circuit of claim 1, wherein the main dc power module comprises a main voltage adjusting unit and a main voltage detecting unit, two detecting terminals of the main voltage detecting unit are electrically connected to two terminals of a load, an output terminal of the main voltage detecting unit is electrically connected to a first input terminal of the main voltage adjusting unit, a second input terminal of the main voltage adjusting unit is electrically connected to a voltage control terminal, and a voltage at the voltage control terminal is a set voltage value; the output end of the main voltage adjusting unit is electrically connected to one end of the load, and the other end of the load is electrically connected to a grounding end; the main voltage adjusting unit is used for adjusting the output voltage of the main direct current power supply module according to a voltage difference value between the voltage value detected by the main voltage detecting unit and the set voltage value of the voltage control end.

5. The current sharing circuit of claim 2, wherein the master sampling voltage detection unit and the slave sampling voltage detection unit are both comparators, and the master voltage adjustment unit is a power amplifier.

6. The current sharing circuit of claim 4, wherein the main voltage adjusting unit is a power amplifier, and the main voltage detecting unit is a comparator.

7. The current sharing circuit of parallel power supplies according to claim 1, wherein the master dc power supply module and the slave dc power supply module are respectively powered by independent power chips.

8. The current-sharing circuit of any one of claims 1 to 7, further comprising a first switch unit connected in series between the output terminal of the master DC power supply module and the output terminal of the slave DC power supply module.

9. The current sharing circuit of claim 1, wherein the number of the slave dc power modules is multiple, and the output terminals of the multiple slave dc power modules are electrically connected to the output terminal of the master dc power module respectively.

10. The current-sharing circuit of parallel power supplies according to claim 9, further comprising a plurality of second switch units respectively connected in series between the output terminal of the master dc power supply module and the output terminal of each slave dc power supply module.

11. A power module, characterized in that the power module comprises: a PCB, a power supply interface unit and a current equalizing circuit of the parallel power supply of any one of claims 1 to 10; the power supply interface unit and the current equalizing circuit of the parallel power supply are arranged on the PCB, and the output end of the current equalizing circuit of the parallel power supply is connected to the power supply interface unit in parallel.

12. The power module of claim 11, wherein the power module comprises a plurality of current sharing circuits of the parallel power supplies; the power module further includes: the third switch unit is arranged on the PCB and is connected in series between the power supply interface unit and the output ends of the current-sharing circuits of the plurality of parallel power supplies, and the third switch unit is used for respectively controlling the on-off of the output end of the current-sharing circuit of each parallel power supply and the power supply interface unit.

13. An integrated circuit test system comprising a power supply module as claimed in any one of claims 11 or 12.

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