Switching power supply control circuit, switching power supply, leading edge detection circuit and method
A switching power supply and control circuit technology, which is applied in the direction of conversion equipment without intermediate conversion to AC, conversion equipment with intermediate conversion to AC, irreversible conversion of AC power input into DC power output, etc., which can solve the problem of high packaging cost and integration Low density, large number of circuit components, etc., to achieve the effect of reducing the number of components and improving circuit integration
Active Publication Date: 2016-08-24
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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Problems solved by technology
[0004] The existing switching power supply requires a special bus sampling circuit and pins are specially set in the switching power supply control circuit for inputting the bus voltage, which leads to a large number of circuit components, low integration, and high packaging cost
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[0068] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.
[0069] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
[0070] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...
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The invention discloses a switch power supply control circuit, a switch power supply, a leading-edge detection circuit and a method. The switch power supply control circuit comprises a zero-cross detection signal input end, a proportion signal obtaining circuit, a zero-cross detection circuit and the leading-edge detection circuit. The proportion signal obtaining circuit is connected with the zero-cross detection signal input end so as to output a first proportion signal and a second proportion signal. The leading-edge detection circuit obtains a bus voltage sampling signal of a preceding switch cycle and a bus voltage sampling signal of a current switch cycle according to switch control signals and the first proportional signal and outputs a leading-edge detection signal when the difference value of the bus voltage sampling signal of the current switch cycle and the bus voltage sampling signal of the preceding switch cycle exceeds a set threshold value. According to the switch power supply control circuit, the switch power supply, the leading-edge detection circuit and the method, the number of components of the switch power supply circuit with a silicon controlled rectifier regulator can be reduced, and circuit integration is improved.
Description
technical field [0001] The invention relates to power electronics technology, in particular to a switching power supply control circuit, a switching power supply, a leading edge detection circuit and a method. Background technique [0002] Thyristor dimming is a commonly used dimming method at present. The thyristor regulator adopts the method of phase control to realize dimming, that is, the conduction of the thyristor regulator is controlled every half cycle of the sine wave to obtain the same conduction phase angle. By adjusting the chopping phase of the thyristor regulator, the conduction phase angle can be changed to realize dimming. [0003] figure 1 It is a schematic circuit diagram of an existing switching power supply with a thyristor regulator. The switching power supply 10 samples the bus voltage to detect the leading edge of the conduction phase angle, which includes the AC input terminal v in , a thyristor regulator 11 , a rectifier bridge 12 , a bus samplin...
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IPC IPC(8): H02M3/28H02M3/10H02M7/12
Inventor 金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD