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High-voltage starting circuit and high-voltage starting method

A high-voltage startup and startup capacitor technology, applied in electrical components, output power conversion devices, etc., can solve the problem that the startup circuit cannot directly obtain the control instructions of the controller, and cannot directly obtain the working information of the controller, etc., and achieves easy miniaturization. , saving power consumption, simple logic effect

Active Publication Date: 2018-07-03
SHENZHEN NANYUN MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the above-mentioned controllers that do not integrate the startup circuit generally do not leave extra pins to control the external startup circuit. The starting circuit needs to design an independent control module to realize the opening and closing of the starting circuit

Method used

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  • High-voltage starting circuit and high-voltage starting method

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Embodiment 1

[0049] figure 2 Shown is a schematic diagram of the application circuit of the high-voltage starting circuit 100 in Embodiment 1 of the present invention. One end of the high-voltage starting circuit 100 is directly connected to the output of the rectifier 10, that is, connected to the rectified power input voltage, and the other end VDD is connected through the starting capacitor C3 In addition, the port VDD is also connected to the controller 20 as a power supply port of the controller 20 . like figure 2 As shown, the high-voltage starting circuit 100 is separated from the controller 20, and is not integrated on the same silicon substrate, that is, the controller 20 is a controller that is not integrated with a starting circuit on the market as introduced in the background of the present invention. It can be seen that even if the high-voltage starting circuit 100 counts the port connected to "ground" ( figure 2 not shown), and only needs 3 pins, which is completely suit...

Embodiment 2

[0067] Figure 4 Shown is a schematic diagram of the application circuit of the high-voltage starting circuit 200 of Embodiment 2 of the present invention, as Figure 4 As shown, different from Embodiment 1, the control module 220 of Embodiment 2 has three terminals, and one end is connected to the first terminal of the starting module 210, and the first terminal of the starting module 210 is connected through the primary winding NP of the transformer T To the rectified power input voltage, in addition, the first end of the start-up module 210 is also connected to the drain of the power switch SW to form a node VD. The meanings of the pins of the high-voltage starting circuit 200 are the same as those in Embodiment 1, and will not be repeated here.

[0068] Figure 5 Shown is the circuit block diagram of the high-voltage start-up circuit 200 of Embodiment 2 of the present invention, as Figure 5 The control module 220 shown includes a detection module 221, a sampling circui...

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Abstract

The invention discloses a high voltage starting circuit and a control method thereof. Electricity can be directly taken from an input voltage, and a controller is started, and self-turn-off can be realized under the condition of not receiving any external signal, so that the starting power consumption can be saved; besides, during power failure protection, the high voltage starting circuit can be self-opened, so that the high voltage starting circuit can be guaranteed to be self-recovered after power failures are removed. Meanwhile, the high voltage starting circuit is simple in structure, small in size and miniature encapsulation can be carried out.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a high-voltage starting circuit and a high-voltage starting method of the switching power supply. Background technique [0002] Generally speaking, the switching power supply (hereinafter referred to as "power supply") circuit will include a start-up circuit to start the controller when the power supply is powered on, drive the transformer to convert the voltage, and realize the normal operation of the power supply. At this time, the power supply of the controller can be provided by the auxiliary winding. . [0003] At present, most of the controllers on the market do not have an integrated start-up circuit, so power supply manufacturers using these controllers usually design an independent start-up circuit outside the controller to complete the start-up of the controller. For example, figure 1 Shown is the most common type of stand-alone startup circuit. like figure 1 As shown, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 唐盛斌符威
Owner SHENZHEN NANYUN MICROELECTRONICS CO LTD
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