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Soft switch circuit and method for adjusting output power by digital wave method

A technology of output power and soft switching, applied in output power conversion devices, electronic switches, control/regulation systems, etc., can solve problems such as adverse effects on the normal operation of the power grid, and achieve the effect of convenient power regulation and wide application fields.

Pending Publication Date: 2020-02-07
邢台子中电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, every time half-wave is taken from the power grid, it will also have a negative impact on the normal operation of the power grid

Method used

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  • Soft switch circuit and method for adjusting output power by digital wave method

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Embodiment

[0019] like figure 1 As shown, the soft switching circuit proposed in this embodiment uses the wave counting method to adjust the output power, including the AC voltage zero-crossing detection circuit and the related main circuit.

[0020] Further, the main circuit includes MOS transistors Q1, Q2, a freewheeling CBB capacitor Cx, and a load RL. The D pin of the MOS transistor Q1 is connected to the live wire (or neutral wire) of the single-phase electricity, and there is an antiparallel diode D1 for freewheeling inside the MOS transistor Q1, and the S pin of the MOS transistor Q1 is connected to the capacitor Cx and one end of the load RL ; The other end of the capacitor Cx and the load RL is connected to the S pin of the MOS tube Q2; the D pin of the MOS tube Q2 is connected to the neutral line (or live line) of the single-phase electricity, and the inside of the MOS tube Q2 has a reverse circuit for freewheeling Parallel diode D2.

[0021] According to another aspect of th...

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Abstract

The invention discloses a soft switch circuit and method for adjusting an output power by a digital wave method, and belongs to the technical field of power electronics. According to the method, the energy transmission characteristic of a alternating current is fully utilized, a singlechip microcomputer or a DSP in an AC voltage zero-crossing detection circuit is controlled to judge a zero-crossing moment of a single-phase alternating current, a switch device is controlled to perform on / off operation each time when an AC voltage cross zero, perfect zero-voltage on / off of the switch device is ensured, and moreover, almost no zero-harmonic pollution on a power supply grid is generated. The singlechip microcomputer or the DSP is used for extracting energy from the power grid according to a relevant proportion and percent ratio between an output power and a rated power, a period of a single-phase power voltage is used as minimum unit, and an MOS tube is switched on / off according to the same proportion; and if a load is a motor needed to be maintained with stable rotation, a plurality of continuous on / off unit times can be combined again, so that each on / off time is possibly short, andstable rotation of the motor is ensured.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a soft switching circuit and a method for adjusting output power by using a counting wave method. Background technique [0002] In various household or industrial appliances that use resistance wires or electric motors as loads, how to ensure continuous and adjustable output power at a low cost has always been a major technical problem in this industry. The most commonly used adjustment method is level adjustment, which cannot achieve continuous adjustment. Only in relatively high-end motor speed control systems, expensive frequency converters are used for speed control and power adjustment. Moreover, frequency converters are used in the circuit to control the motor. This not only increases the cost of the system, but also makes the power factor of the system very low, the efficiency decreases, and the harmonic pollution to the power grid is also increased. [0003] Th...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02P1/26H02P1/42G05B19/042G01R19/175H03K17/687
CPCG01R19/175G05B19/042H02M1/08H02P1/26H02P1/42H03K17/687Y02B70/10
Inventor 易智勇王德斌
Owner 邢台子中电子科技有限公司
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