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Method and device for automatically equalizing bus voltage by power factor correction pfc circuit

A power factor correction and automatic equalization technology, applied in the circuit field, can solve problems such as positive and negative bus voltage imbalance, achieve the effect of increasing output power and enhancing the ability of bus voltage equalization regulation

Active Publication Date: 2016-12-21
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a method and device for automatically balancing bus voltage in a power factor correction PFC circuit to solve the problem of unbalanced positive and negative bus voltages when the PFC circuit is working in an uncontrolled rectification state or the load is light

Method used

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  • Method and device for automatically equalizing bus voltage by power factor correction pfc circuit
  • Method and device for automatically equalizing bus voltage by power factor correction pfc circuit
  • Method and device for automatically equalizing bus voltage by power factor correction pfc circuit

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Embodiment 1

[0098] This embodiment provides a device for automatically balancing the bus voltage by a PFC circuit, such as Figure 6 As shown, the device includes: a voltage deviation module 61 and a speed control module 62;

[0099] Wherein, the voltage deviation module 61 specifically includes: a sampling module 611, a calculation module 612; the calculation module 612 provides a set voltage value ΔVref, and the set voltage value is a real voltage magnitude;

[0100] The speed control module 62 specifically includes: a superposition duty ratio module 621, an original duty ratio module 622, a first duty ratio module 623, and a first pulse width modulation module 624;

[0101] The superimposed duty ratio module 621 includes: a first superimposed wave-emitting calculation module 6211 and a superimposed duty-cycle calculation module 6212; the first superimposed wave-emitting calculation module 6211 is realized by a proportional controller (ie, a P controller), and the P controller A propor...

Embodiment 2

[0115] This embodiment provides a device for automatically balancing the bus voltage by a PFC circuit, such as Figure 8 As shown, the device includes: a voltage deviation module 81 and a speed control module 82;

[0116] Wherein, the voltage deviation module 81 specifically includes: a sampling module 811, a calculation module 812; the calculation module 812 provides a set voltage value ΔVref, the set voltage value is an analog voltage magnitude, and the analog voltage magnitude is consistent with the real voltage The magnitude has a proportional relationship 1:n, where n>0;

[0117] The speed control module 82 specifically includes: a superimposed wave sending module 821, an original wave sending module 822, a wave sending comparison module 823, a second duty cycle module 824, and a second pulse width modulation module 825;

[0118] The superimposed wave sending module 821 is realized by a proportional-integral controller (ie, a PI controller).

[0119] Such as Figure 9 ...

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Abstract

The invention discloses a PFC circuit bus voltage automatic equalization method and device. The method includes the steps of calculating a voltage deviation of a positive bus and a negative bus, and quickening the rotation speed of a fan in a PFC circuit according to the voltage deviation of the positive bus and the negative bus until the voltage of the positive bus and the voltage of the negative bus are balanced. The PFC circuit bus voltage automatic equalization method and device are based on the principle that when the PFC circuit works in an uncontrolled-rectification state or low-load state, the output power is increased, the PWM wave generating amount can be increased, and the capacity of a bias voltage ring for balancing the voltage of the positive bus and the voltage of the negative bus is accordingly improved. The mode that the rotation speed of the fan is quickened is adopted to increase the output power of the PFC circuit, the capacity of the bias voltage ring for balancing the voltage of the buses is further improved, and the aims of balancing the voltage of the positive bus and the voltage of the negative bus is achieved. According to the PFC circuit bus voltage automatic equalization method and device, other hardware circuits are not required to be additionally arranged, an original circuit structure of the PFC circuit is not required to be changed, and the problem that the voltage of the positive bus and the voltage of the negative bus are not balanced when the PFC circuit works in the uncontrolled-rectification state or low-load state is effectively solved.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a method and a device for automatically equalizing bus voltage in a PFC (Power Factor Correction, power factor correction) circuit. Background technique [0002] In a high-power power supply, in order to improve the power factor of the power supply, a PFC circuit is usually used. For a PFC circuit with a positive and negative busbar structure, whether the voltage of the positive and negative busbars is balanced will affect the voltage stress of the switching tube in the PFC circuit structure and the overvoltage protection strategy. Therefore, it is necessary to take positive and negative busbar voltage equalization measures , so that the voltages of the positive bus and the negative bus are in a balanced state. [0003] In the PFC circuit, a bias voltage loop is used to control the voltage of the positive and negative busbars to be in a balanced state. The biasing loop mainly adjusts the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/28H02J3/18
CPCY02E40/30Y02P80/10
Inventor 孙静吕华军孙景
Owner EMERSON NETWORK POWER CO LTD
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