Current sharing circuit of isolated current-sharing bus and power supply circuit

A technology of isolating circuit and current sharing bus, which is applied in the direction of converting DC power input to DC power output, electrical components, adjusting electrical variables, etc. problems, to avoid mutual influence, improve the accuracy of current sharing, and ensure independence.

Inactive Publication Date: 2022-01-18
HAWUN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this case, the ground of the current sharing bus (share) cannot be isolated from the power ground. When the loads are different, the power circuit will generate line loss on the power ground network, which w

Method used

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  • Current sharing circuit of isolated current-sharing bus and power supply circuit
  • Current sharing circuit of isolated current-sharing bus and power supply circuit
  • Current sharing circuit of isolated current-sharing bus and power supply circuit

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Specific Example 1

[0036] An isolating type of the application flow are sharing circuit bus, such as image 3 Shown, including current sampling isolation amplifier circuit, the second isolation circuit, current sharing control processing circuits, each processing circuit respectively control the flow of the second isolation circuit, current sampling isolation amplifier circuit, a current sampling circuit for sampling a current isolation amplifier signal and amplified, while sample isolated from ground; current controlled current processing circuit for sampling the amplified signal are flow control process are output stream signal, outputting a second isolation circuit for power sharing circuit with between isolates, the average flow signal to the subsequent processing circuit.

[0037] Wherein, where the current sample represents a sampling circuit ground.

[0038] like Figure 4As shown, the current sampling isolation amplifier circuit includes a current isolation amplific...

Example Embodiment

[0048] Specific Example 2

[0049] A power supply circuit with an isolation type average flow circuit, such as Figure 5 As shown, including a current sampling isolation amplifying circuit, a current flow control process circuit, an output voltage sampling circuit, an output voltage feedback loop, a first isolation circuit, a second isolation circuit, a PWM control circuit, a power isolation conversion circuit, and a power isolation conversion circuit. The primary connection of the power supply input, the secondary connection power supply output, connected in series resistance on the negative output of the power supply output, the current sampling isolation amplification of the two ends of the sampling resistor, performs current sampling, current sampling isolation amplification circuit output connection The input of the current flow control processing circuit is used to output a current signal, and the second end is connected to the input terminal of the second isolation circuit, ...

Example Embodiment

[0052] Specific Example 3

[0053] A power supply circuit with an isolation type average flow circuit, such as Figure 7 As shown, including a current sampling isolation amplifying circuit, a current flow control process circuit, an output voltage sampling circuit, an output voltage feedback loop, a first isolation circuit, a second isolation circuit, a PWM control circuit, a power isolation conversion circuit, and a power isolation conversion circuit. The primary connection of the power supply input, the secondary connection power supply output, sampling resistors on the negative input of the power input, the current sampling isolation amplification of the two ends of the sampling resistor, performing current sampling, current sampling isolation amplification circuit output connection The input of the current flow control processing circuit is used to output a current signal, and the second end is connected to the input terminal of the second isolation circuit, and the output of t...

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PUM

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Abstract

The invention discloses a current sharing circuit of an isolated current sharing bus and a power supply circuit, and the current sharing circuit comprises a current sampling isolation amplification circuit, a second isolation circuit, and a current sharing control processing circuit which is connected with the second isolation circuit and the current sampling isolation amplification circuit. The second isolation circuit is used for isolation between an output power ground and a current-sharing circuit ground, the current-sharing control processing circuit is used for carrying out current-sharing control processing so as to output current-sharing signals, and the current sampling isolation amplification circuit is used for sampling and amplifying current signals and simultaneously isolating from a sampling ground. The power supply circuit comprises a current sharing circuit which is used for carrying out current sharing among multiple power supplies when the multiple switching power supplies are used in parallel. The sampling end of the current sharing circuit is isolated from the sampling ground, and the output end of the current sharing circuit is isolated from the control ground, so that the independence of the current sharing circuit is ensured, the mutual influence between the circuits is avoided, and the current sharing precision is improved.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a current sharing circuit and a power supply circuit of an isolated current sharing bus. Background technique [0002] At present, in the parallel use of switching power supplies, sampling current is used to control the output current. One of the sampling currents is sampling at the primary side of switching power supplies, and the other is sampling at the secondary After a series of circuit processing, the duty cycle of the power device of the switching power supply is controlled, so as to realize the control of the output current of each power supply in the parallel application. [0003] In the prior art, neither the primary sampling nor the secondary sampling, the current sharing control circuit is not isolated from the power ground. [0004] Specifically, such as figure 1 , 2 shown, where figure 1 in the secondary sampling current, figure 2 where is the...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/44H02M1/00
CPCH02M3/33523H02M1/44H02M1/00
Inventor 崔荣明宋栋梁王跃斌
Owner HAWUN ELECTRONICS CO LTD
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