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apfc constant current controller integrated circuit

A technology of integrated circuits and flow controllers, which is applied in the field of driving devices and APFC constant current controller integrated circuits, can solve the problems of not increasing the manufacturing cost and so on.

Active Publication Date: 2016-09-28
许瑞清
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In view of the above-mentioned defects of the existing APFC scheme, the purpose of the present invention is to solve the moisture-proof problem of LED lighting fixtures without substantially increasing the manufacturing cost

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Embodiment Construction

[0044] As mentioned above, in order to ensure the stable operation of the drive circuit, APFC technology requires that the unity gain bandwidth of the feedback control loop must be below 10Hz, which makes the capacitance of the frequency compensation capacitor larger, generally around 1uF. Those skilled in the art understand that it is unrealistic to directly integrate a 1uF capacitor into the chip. According to the level of modern microelectronic semiconductor technology, only 1uF capacitor needs 100mm 2 The silicon chip area above is equivalent to the silicon chip area of ​​the most advanced computer CPU of the time. This is not possible due to the high cost.

[0045] refer to Figure 4 , Figure 4 The structure of the integrated circuit of the APFC constant current controller according to an embodiment of the present invention is shown. In this embodiment, the preprocessing circuit 121 and the APFC logic control circuit 123 still maintain figure 2 The structure and fu...

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Abstract

The invention discloses an APFC constant current controller integrated circuit which comprises a preprocessing circuit, an integrating amplifier and an APFC logic control circuit. The preprocessing circuit receives current feedback signals from an external DC / DC power conversion level. The DC / DC power conversion level converts alternating-current input voltage after full-wave rectification into direct-current output current which is provided for a constant current source load. The integrating amplifier comprises an error amplifier, an integrating resistor and an integrating capacitor. A first input end of the error amplifier receives current feedback signals processed by the preprocessing circuit through the integrating resistor, a second input end of the error amplifier receives a reference signal, and the output end of the error amplifier generates amplified error signals. One end of the integrating capacitor is connected with a node between the first input end of the error amplifier and the integrating resistor, and the other end of the integrating capacitor is connected with the output end of the error amplifier. The APFC logic control circuit is connected with the output end of the error amplifier and is used for generating driving signals on the DC / DC power conversion level so that PFC and constant current control can be carried out. The moisture proof performance of an LED lighting lamp is effectively improved.

Description

technical field [0001] The present invention relates to an APFC constant current controller, in particular to an APFC constant current controller integrated circuit for driving a constant current source load, a drive device comprising the controller integrated circuit, and a lighting comprising the drive device lamps. Background technique [0002] As a new generation of lighting sources, light-emitting diodes (LEDs) are gradually being widely used. At present, the switching power supply used as the main driving power supply of LED has gone through two stages of development. In the first stage, a variety of professional LED constant-current switching power supply controllers appeared on the market, and the gradually mature driver integrated circuits greatly promoted the start-up and growth of the LED lighting market. This stage is the initial stage of LED lighting, basically facing the low-end lighting market. With the penetration of LED lighting fixtures into the high-end...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 许瑞清金红涛刘立国
Owner 许瑞清
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