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Buck-boost constant current source load driving device

A technology of load drive and drive device, which is applied in the field of constant current source load drive device, can solve the problems of large error, rough open circuit protection, and failure to realize output voltage detection, etc., and achieves the effect of low cost and improved protection accuracy

Pending Publication Date: 2019-12-27
北京模电半导体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this open-circuit protection method cannot achieve accurate output voltage detection, the implemented open-circuit protection is rough with considerable error (greater than + / -25%)

Method used

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  • Buck-boost constant current source load driving device
  • Buck-boost constant current source load driving device
  • Buck-boost constant current source load driving device

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Embodiment Construction

[0023] The inventor considers that it is necessary to reduce the peripheral components, and the control chip must be simple and low in cost, so he can only find a way to design a new circuit structure. refer to image 3 , image 3 It is a circuit structure diagram of a buck-boost type constant current source load driving device according to an embodiment of the present invention. and figure 1 , figure 2 The topology of the constant current controller is different. The drive device is not a buck topology; it is not a boost topology, and it is also different from the general buck-boost topology, but a new variant of the buck-boost topology.

[0024] Such as image 3 As shown, the driving device for driving the LED load 111 includes a controller integrated circuit 300, a power supply resistor 103, and a power conversion stage, and the power conversion stage is composed of a power switch 307, an inductor 309, a freewheeling diode 308, a capacitor 304, and a detection resistor...

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Abstract

The invention discloses a buck-boost constant-current source load driving device. The device comprises a controller integrated circuit, a power conversion stage and a power supply resistor; and a power conversion stage comprises a power switch, an inductor, a fly-wheel diode, a capacitor and a detection resistor. According to the buck-boost constant-current source load driving device of the invention, peripheral elements can be reduced; the controller integrated circuit can be designed and produced by adopting a common process, so that cost is effectively reduced; and an output voltage VCC isdirectly detected, so that open-circuit protection is realized, and protection precision is greatly improved.

Description

technical field [0001] The present invention relates to a constant current source load drive device, in particular to a buck-boost type constant current source load drive device and a lighting fixture including the drive device. Background technique [0002] Currently, Light Emitting Diode (LED) lighting sources have been widely used. As the main drive power supply for LED light sources, a variety of professional LED constant-current switching power supply controllers have appeared in the early stage of the market; then, gradually mature professional drive integrated circuits have greatly promoted the start-up and growth of the LED lighting market. [0003] The circuit structure of the first generation of relatively mature non-isolated LED step-down constant current controller, such as figure 1 shown. With the rapid increase in shipments in the low-end market, the market has put forward new requirements for the cost of LED drive power. The circuit structure of a new gener...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCY02B20/30
Inventor 许瑞清刘立国
Owner 北京模电半导体有限公司