A current sampling CT multiplexing circuit, its control method, device, and medium

Abstract

The present invention relates to the field of sampling technology, and in particular to a current sampling CT multiplexing circuit, its control method, device, and medium, including: a half-bridge inverter circuit, an inverter inductor, a bypass inverter switching relay, a current transformer, and a load connected in sequence; the bypass inverter switching relay is used to switch the circuit between a bypass working mode and an inverter mode, so as to sample the output current corresponding to different working modes through the current transformer; it solves the problem that existing UPS power supplies need to install current samplers at the inverter output end and the system output end respectively, which not only increases the system cost and the demand for the control chip's IO ports, but also is not conducive to the miniaturization trend. The present invention realizes the switching between the bypass working mode and the inverter mode by controlling the double-switch state of the bypass inverter switching relay, thereby realizing the flexible switching of the sampled current in different modes, saving hardware costs, and reducing the demand for control IO ports.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling, and in particular to a current sampling CT multiplexing circuit and its control method, device, and medium. Background Art

[0002] UPS, namely Uninterruptible Power Supply, is an uninterruptible power supply containing an energy storage device, which is mainly used to provide uninterrupted power for some devices with high requirements for power stability, such as Figure 1 As shown, the existing UPS power supply usually has a current transformer CT1 at the inverter output end and a current transformer CT2 at the system output end. Among them, the current transformer CT1 at the inverter output end is used to sample the working current of the inverter inductor in real time and feedback it to the control chip to drive and adjust the current transformer CT2; the current transformer CT2 at the system output end is used to sample the output current when the USP is operating in the inverter mode or the bypass mode and feedback it to the control chip for identification.

[0003] However, the existing UPS power supply with current samplers installed at the inverter output end and the system output end respectively has the following defects:

[0004] (1) Since current samplers need to be installed at the inverter output end and the system output end respectively, the system cost is relatively high;

[0005] (2) It increases the required layout space and is not conducive to the trend of miniaturization;

[0006] (3) It increases the requirement for the IO ports of the control chip. Summary of the Invention

[0007] The present invention provides a current sampling CT multiplexing circuit and its control method, device, and medium, and the technical problem to be solved is that the existing UPS power supply needs to install current samplers at the inverter output end and the system output end respectively, which not only increases the system cost and the requirement for the IO ports of the control chip, but also is not conducive to the trend of miniaturization.

[0008] To solve the above technical problems, the present invention provides a current sampling CT multiplexing circuit and its control method, device, and medium.

[0009] In a first aspect, the present invention provides a current sampling CT multiplexing circuit, including: a half-bridge inverter circuit, an inverter inductor, a bypass inverter switching relay, a current transformer, and a load connected in sequence;

[0010] The bypass inverter switching relay includes first to fifth pins. The third, fourth, and fifth pins form a double switch. Among them, the third pin is connected to the bypass voltage terminal, the fifth pin is connected to the output terminal of the inverter inductor, the fourth pin is the common output terminal of the double switch, and the fourth pin is connected to the first primary winding of the current transformer to provide load current for the load through the first primary winding of the current transformer;

[0011] The output terminal of the inverter inductor is also connected to the second primary winding of the current transformer, so that the inverter voltage output from the output terminal of the inverter inductor obtains an inverter capacitor current through the second primary winding.

[0012] In a further embodiment, the double switch is used to switch working modes, and the working modes include a bypass working mode and an INV working mode.

[0013] In a further embodiment, it further includes an inverter capacitor connected to the second primary winding of the current transformer.

[0014] In a further embodiment, it further includes: a controller connected to the secondary winding of the current transformer;

[0015] The current transformer is used to superimpose, sample, and attenuate the provided load current and inverter capacitor current to obtain an attenuated current, and feedback the attenuated current to the controller;

[0016] The controller is used to obtain the working current of the inverter inductor according to the attenuated current, so as to control the working state of the half-bridge inverter circuit according to the working current of the inverter inductor.

[0017] In a further embodiment, the half-bridge inverter circuit includes a first capacitor, a second capacitor, a first IGBT tube, and a second IGBT tube.

[0018] In a second aspect, the present invention provides a control method for a current sampling CT multiplexing circuit. The method includes the following steps:

[0019] Control the switching of the working mode through the double switch of the bypass inverter switching relay. The working modes include a bypass working mode and an INV working mode;

[0020] Based on different working modes, provide corresponding load current for the load through a current sensor, and control the operation of the multiplexing circuit in the corresponding working mode.

[0021] In a further embodiment, the method specifically includes:

[0022] When the control switches to the bypass working mode, the third and fourth pins of the drive bypass inverter switching relay are turned on, so that after the bypass voltage passes through the bypass inverter switching relay and the current transformer, it provides load current for the load;

[0023] When the load is in stable operation or dynamic change, the current transformer feeds back the load current after sampling and attenuation to the controller, so as to monitor the load status in real time through the controller.

[0024] In a further embodiment, the method specifically includes:

[0025] When the control switches to the INV working mode, the fourth and fifth pins of the drive bypass inverter switching relay are turned on, so that the inverter voltage output by the inverter inductor provides load current for the load after passing through the bypass inverter switching relay and the current transformer. At the same time, the inverter voltage output by the inverter inductor also provides inverter capacitor current for the inverter capacitor through the second input terminal of the current transformer;

[0026] In the INV working mode, the current transformer samples and attenuates the superposition of the load current and the inverter capacitor current to obtain a superimposed and attenuated current, and feeds back the superimposed and attenuated current to the controller, so that the controller obtains the working current of the inverter inductor according to the superimposed and attenuated current, and controls the working state of the half-bridge inverter circuit according to the working current of the inverter inductor.

[0027] In a third aspect, the present invention also provides a computer device, including a processor and a memory. The processor is connected to the memory. The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the computer device executes the steps of implementing the above method.

[0028] In a fourth aspect, the present invention also provides a computer-readable storage medium. A computer program is stored in the computer-readable storage medium, and when the computer program is executed by a processor, the steps of implementing the above method are realized.

[0029] The present invention provides a current sampling CT multiplexing circuit, its control method, device, and medium. By installing a current transformer CT at the system output end, and sampling and attenuating the corresponding current under different working modes, and feeding the sampled and attenuated current signal back to the controller, the technical solution is realized that it can sample the output current in the bypass working mode, and can also sample the INV inductor current in the INV working mode. At the same time, in the INV working mode, the working current of the inverter inductor is sampled by the same current transformer and fed back to the controller. Compared with the prior art, by sampling the output current under different working modes, this circuit can better control the INV drive operation, and the present invention has the advantages of simple structure, low production cost, and saving the IO ports for control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a simple schematic diagram of the traditional UPS power supply structure provided by the background art of the present invention;

[0031] Figure 2 is a schematic diagram of the structure of a current sampling CT multiplexing circuit provided by an embodiment of the present invention;

[0032] Figure 3 is a schematic diagram of the current flow direction of the current sampling CT multiplexing circuit provided by an embodiment of the present invention;

[0033] Figure 4 is a schematic diagram of the flow of the control method of a current sampling CT multiplexing circuit provided by an embodiment of the present invention;

[0034] Figure 5 is a schematic diagram of the structure of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The embodiments of the present invention will be specifically described below in conjunction with the drawings. The given embodiments are only for illustrative purposes and should not be construed as limiting the present invention. The drawings are only for reference and illustration, and do not constitute a limitation to the scope of patent protection of the present invention, because many changes can be made to the present invention without departing from the spirit and scope of the present invention.

[0036] Refer to Figure 2 , an embodiment of the present invention provides a current sampling CT multiplexing circuit. As Figure 2 shown, the circuit includes: a half-bridge inverter circuit, an inverter inductor L01, a bypass inverter switching relay RY2, a current transformer CT02, and a load R01 connected in sequence.

[0037] In one embodiment, the half-bridge inverter circuit includes a first capacitor C01, a second capacitor C02, a first IGBT transistor Q01, and a second IGBT transistor Q02. Among them, the common terminal of the first capacitor C01 and the second capacitor C02 is grounded. One end of the inverter inductor L01 is connected to the first capacitor C01 through the first IGBT transistor Q01, and one end of the inverter inductor L01 is connected to the second capacitor C02 through the second IGBT transistor Q02.

[0038] As Figure 3 shown, in this embodiment, when the first IGBT transistor Q01 is turned on and the second IGBT transistor Q02 is turned off, the circuit stores energy in the inverter inductor L01 and supplies power to the load; when both the first IGBT transistor Q01 and the second IGBT transistor Q02 are turned off, the inverter inductor L01 releases energy and supplies power to the load; when the first IGBT transistor Q01 is turned off and the second IGBT transistor Q02 is turned on, the inverter inductor L01 releases energy and supplies power to the load; when both the first IGBT transistor Q01 and the second IGBT transistor Q02 are turned off, the inverter inductor L01 releases energy and supplies power to the load.

[0039] In one embodiment, the bypass inverter switching relay RY2 includes first to fifth pins. The third pin 3, the fourth pin 4, and the fifth pin 5 form a double switch. Among them, the third pin 3 is connected to the bypass voltage terminal BYP_ASS, the fifth pin 5 is connected to the output terminal of the inverter inductor, the fourth pin 4 is the common output terminal of the double switch, and the fourth pin 4 is connected to the first primary winding CT_3 pin of the current transformer CT02 to provide load current for the load through the first primary winding (CT_3 pin, CT_2 pin) of the current transformer.

[0040] In this embodiment, the double switch in the bypass inverter switching relay RY2 is used to switch the working mode, and the working mode includes a bypass working mode and an INV working mode.

[0041] In one embodiment, the second primary winding CT_5 pin of the current transformer is connected to the output terminal of the inverter inductor, so that the inverter voltage output from the output terminal of the inverter inductor obtains an inverter capacitor current through the second primary winding; the second primary winding CT_6 pin of the current transformer is grounded through an inverter capacitor C03; the secondary winding (CT_1 pin, CT_4 pin) of the current transformer is connected to a controller.

[0042] In this embodiment, the current transformer is used to superimpose and sample and attenuate the provided load current and inverter capacitor current to obtain an attenuated current, and feedback the attenuated current to the controller.

[0043] The controller is configured to obtain the operating current of the inverter inductor based on the decaying current, so as to control the operating state of the half-bridge inverter circuit according to the operating current of the inverter inductor.

[0044] The working principle of the current sampling CT multiplexing circuit in this embodiment will be described below:

[0045] In Figure 2 when it is necessary to switch to the bypass operating mode, the relay driving unit controls the 3rd and 4th pins of the bypass inverter switching relay RY2 to conduct. At this time, the bypass voltage BYP_ASS directly supplies power to the load R01 through the bypass inverter switching relay RY2 and the CT_3 pin and CT_2 pin of the current transformer CT02.

[0046] When the load R01 is in a stable operation or dynamic change state, the current transformer CT02 can sample and attenuate the load current flowing through it, and output and feedback it to the controller through the CT_1 pin and CT_4 pin, so as to monitor the load state in real time. At this time, since the INV terminal of the inverter capacitor C03 is not loaded and the current is small, the influence on the load can be basically ignored. At the same time, in the bypass operating mode, extremely small differences in the load amount will not have an adverse impact on the system operation.

[0047] The current sampled in the bypass operating mode is only used to judge the load amount in the bypass and is not used to control the operation of the inverter.

[0048] In Figure 2 when it is necessary to switch to the INV operating mode, the relay driving unit controls the 5th and 4th pins of the relay RY2 to conduct. At this time, the inverted voltage output after system inversion will supply power to the load R01 through the bypass inverter switching relay RY2 and the CT_3 pin and CT_2 pin of the current transformer CT02. At the same time, the output inverted voltage also supplies power to the inverter capacitor C03 through the CT_5 pin and CT_6 pin of the current transformer CT02.

[0049] At this time, the current transformer CT02 will sample and attenuate the superposition of the load current Ir and the inverter capacitor current Ic, and feedback it to the controller through the CT_1 pin and CT_4 pin of the current transformer CT02, so as to obtain the operating current I L of the inverter inductor L01, thereby controlling the operation of the half-bridge inverter circuit.

[0050] At the same time, the inverted current value sampled in the INV operating mode is also used as the load current as a condition for load amount detection.

[0051] In this circuit, since the inverter inductor current I L, there is a phase relationship among the inverter capacitor current Ic and the load current Ir. Therefore, when the current sampling CT02 is respectively connected to the two main current terminals on the primary side, attention should be paid to the relationship between the same-name terminals of the two input traces on the primary side.

[0052] A current sampling CT multiplexing circuit provided in this embodiment includes a half-bridge inverter circuit, an inverter inductor, a bypass inverter switching relay, a current transformer, and a load. Among them, the bypass inverter switching relay controls the switching between the bypass working mode and the INV working mode through its double switches, so that the current transformer can sample the output current in the bypass mode and the INV inductor current in the INV working mode, simplifying the circuit design and the hardware installation link, and reducing the usage requirements of the IO ports.

[0053] In one embodiment, as Figure 4 shown, an embodiment of the present invention provides a control method for a current sampling CT multiplexing circuit, and the method includes the following steps:

[0054] S1. Control the switching of the working mode through the double switches of the bypass inverter switching relay, and the working mode includes the bypass working mode and the INV working mode;

[0055] S2. Based on different working modes, provide corresponding load currents for the load through a current sensor, and control the operation of the multiplexing circuit in the corresponding working mode.

[0056] In one embodiment, the method specifically includes:

[0057] When controlling the switching to the bypass working mode, drive the third pin and the fourth pin of the bypass inverter switching relay to conduct, so that after the bypass voltage passes through the bypass inverter switching relay and the current transformer, it provides a load current for the load;

[0058] When the load is in stable operation or dynamic change, the current transformer feeds back the load current after sampling and attenuation to the controller to monitor the load status in real time through the controller.

[0059] In one embodiment, the method specifically includes:

[0060] When controlling the switching to the INV working mode, drive the fourth pin and the fifth pin of the bypass inverter switching relay to conduct, so that the inverter voltage output by the inverter inductor provides a load current for the load after passing through the bypass inverter switching relay and the current transformer, and at the same time, the inverter voltage output by the inverter inductor also provides an inverter capacitor current for the inverter capacitor through the second input terminal of the current transformer;

[0061] In the INV operating mode, the current transformer samples and attenuates the sum of the load current and the inverter capacitor current to obtain a superimposed and attenuated current, and feeds the superimposed and attenuated current back to the controller, so that the controller obtains the operating current of the inverter inductor based on the superimposed and attenuated current, and controls the operating state of the half-bridge inverter circuit based on the operating current of the inverter inductor.

[0062] It should be noted that the magnitudes of the sequence numbers of the above processes do not imply the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0063] For the specific limitations on a control method of a current sampling CT multiplexing circuit, reference can be made to the above limitations on a current sampling CT multiplexing circuit, which will not be elaborated here. Those of ordinary skill in the art can realize that the various modules and steps described in combination with the embodiments disclosed in the present application can be implemented by hardware, software, or a combination of both. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0064] The embodiment of the present invention provides a control method for a current sampling CT multiplexing circuit. The method switches the circuit to a bypass operating mode and an INV operating mode respectively through a dual switch. In the bypass operating mode, the bypass voltage supplies power to the load through a bypass inverter switching relay and a current transformer. In the INV operating mode, the inverter voltage output by the inverter inductor supplies power to the load through a bypass inverter switching relay and a current transformer, and supplies power to the inverter capacitor through the current transformer at the same time. Compared with the prior art, the present application realizes sampling of the current in the bypass operating mode and the INV operating mode respectively, has a simple control logic, is easy to implement, has high reliability, and reduces the hardware cost and occupied space.

[0065] Figure 5 A computer device provided by an embodiment of the present invention includes a memory, a processor, and a transceiver, which are connected through a bus. The memory is used to store a set of computer program instructions and data, and can transmit the stored data to the processor. The processor can execute the program instructions stored in the memory to execute the steps of the above method.

[0066] Among them, the memory may include volatile memory or non-volatile memory, or may include both volatile and non-volatile memory; the processor may be a central processing unit, a microprocessor, an application specific integrated circuit, a programmable logic device, or a combination thereof. By way of example but not limitation, the above programmable logic device may be a complex programmable logic device, a field programmable gate array, a generic array logic, or any combination thereof.

[0067] In addition, the memory may be a physically independent unit or may be integrated with the processor.

[0068] Those of ordinary skill in the art can understand that Figure 5 the structure shown in is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have the same component arrangement.

[0069] In one embodiment, the embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above method are implemented.

[0070] A current sampling CT multiplexing circuit, its control method, device, and medium provided by the embodiment of the present invention. A current sampling CT multiplexing circuit only needs to use one current transformer CT to realize current sampling in different working modes and feedback the sampled inverter voltage to the controller for drive control adjustment. Compared with the prior art, the present invention saves the use of one current transformer, reduces the hardware cost and occupied space, and at the same time reduces the requirements for the controller IO ports.

[0071] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that the computer can access or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as an SSD), etc.

[0072] Those skilled in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods.

[0073] The above embodiments only represent several preferred implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the protection scope of the claims.

Claims

1. A current sampling CT multiplexing circuit, characterized in that, it includes: a half-bridge inverter circuit, an inverter inductor, a bypass inverter switching relay, a current transformer, and a load connected in sequence; the bypass inverter switching relay includes first to fifth pins, and the third pin, the fourth pin, and the fifth pin form a double switch, wherein the third pin is connected to a bypass voltage terminal, the fifth pin is connected to the output terminal of the inverter inductor, the fourth pin is the common output terminal of the double switch, and the fourth pin is connected to the first primary winding of the current transformer to provide a load current for the load through the first primary winding of the current transformer; the output terminal of the inverter inductor is also connected to the second primary winding of the current transformer, so that the inverter voltage output from the output terminal of the inverter inductor obtains an inverter capacitor current through the second primary winding; the double switch is used to switch working modes, and the working modes include a bypass working mode and an INV working mode.

2. The current sampling CT multiplexing circuit according to claim 1, characterized in that: it further includes an inverter capacitor connected to the second primary winding of the current transformer.

3. The current sampling CT multiplexing circuit according to claim 1, characterized in that, it further includes: a controller connected to the secondary winding of the current transformer; the current transformer is used to superimpose and sample and attenuate the provided load current and inverter capacitor current to obtain an attenuated current, and feedback the attenuated current to the controller; the controller is used to obtain the working current of the inverter inductor according to the attenuated current, so as to control the working state of the half-bridge inverter circuit according to the working current of the inverter inductor.

4. The current sampling CT multiplexing circuit according to claim 1, characterized in that: the half-bridge inverter circuit includes a first capacitor, a second capacitor, a first IGBT tube, and a second IGBT tube.

5. A control method for a current sampling CT multiplexing circuit, characterized in that, applying the current sampling CT multiplexing circuit according to any one of claims 1 to 4, the method includes the following steps: controlling the switching of the working mode through the double switch of the bypass inverter switching relay, and the working modes include a bypass working mode and an INV working mode; based on different working modes, providing a corresponding load current for the load through a current sensor, and controlling the working of the multiplexing circuit in the corresponding working mode.

6. The control method for a current sampling CT multiplexing circuit according to claim 5, characterized in that, the method specifically includes: when controlling the switching to the bypass working mode, driving the third pin and the fourth pin of the bypass inverter switching relay to conduct, so that the bypass voltage provides a load current for the load after passing through the bypass inverter switching relay and the current transformer; when the load is in stable operation or dynamic change, the current transformer feeds back the sampled and attenuated load current to the controller to monitor the load state in real time through the controller.

7. The control method for a current sampling CT multiplexing circuit according to claim 6, characterized in that, the method specifically includes: When the control switches to the INV operating mode, drive the fourth and fifth pins of the bypass inverter switching relay to conduct, so that the inverter voltage output by the inverter inductor, after passing through the bypass inverter switching relay and the current transformer, provides load current for the load. At the same time, the inverter voltage output by the inverter inductor also provides inverter capacitor current for the inverter capacitor through the second input terminal of the current transformer; In the INV operating mode, the current transformer samples and attenuates the superposition of the load current and the inverter capacitor current to obtain a superimposed and attenuated current, and feeds the superimposed and attenuated current back to the controller, so that the controller obtains the operating current of the inverter inductor according to the superimposed and attenuated current, and controls the operating state of the half-bridge inverter circuit according to the operating current of the inverter inductor.

8. A computer device, characterized in that: It includes a processor and a memory. The processor is connected to the memory. The memory is used to store a computer program. The processor is used to execute the computer program stored in the memory, so that the computer device executes the method according to any one of claims 5 to 7.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is run, the method according to any one of claims 5 to 7 is implemented.

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