Current Ripple Cancellation IC
An integrated circuit and ripple technology, applied in the field of constant current source load drive devices, can solve the problems of troublesome design, manufacture, application and maintenance, lack of over-temperature protection of power components, short-circuit protection and open-circuit protection, and high cost
Active Publication Date: 2016-05-18
中山市模电电子科技有限公司
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Problems solved by technology
However, image 3 The disadvantages of the scheme are also obvious
First, image 3 The solution is composed of discrete components. This figure is only a schematic diagram. The actual number of components is more than 10, which makes the design, manufacture, application and maintenance more troublesome.
Second, since it is composed of discrete components, image 3 It is impossible to have perfect protection measures in the scheme, for example, without over-temperature protection, short-circuit protection, and open-circuit protection of power components
In this way, once a certain link goes wrong, it is likely to cause the system to burn out, which will cause great trouble in the process of mass production and installation
third, image 3 The cost of the program is still high
fourth, image 3 The solution is an open-loop system, which has high requirements on the application environment and is not conducive to commercial promotion
Method used
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[0036] refer to Figure 5 , Figure 5 An LED driving device according to an embodiment of the present invention is shown. In this device, the LED load 105 is driven by a single-stage APFC constant current DC / DC circuit 102, and the single-stage APFC constant current DC / DC circuit 102 independently implements power factor correction (PFC) and constant current control of the entire device. The current ripple elimination integrated circuit 510 is connected in series with the LED load 105 , and then connected to both ends of the filter capacitor 103 . The function of the integrated circuit 510 is to eliminate the 100 / 120 Hz current ripple generated by the previous single-stage APFC constant current DC / DC circuit 102 .
[0037] Inside the integrated circuit 510 , there are a voltage compression shaping circuit 516 , an error amplifier circuit 530 , a low-gain inverting amplifier 517 and an NMOS transistor 518 . The integrated circuit 510 has three pins, wherein, the first pin LB...
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The invention discloses an integrated circuit capable of eliminating a current ripple of a constant-current source load. The integrated circuit comprises a constant-current source load drive unit of the integrated circuit and an illumination lamp containing the drive unit. According to the invention, the integrated circuit is used for eliminating a current ripple according to a single stage active power factor correction (APFC) constant-current LED driving scheme; and a minimalism requirement of minimum discrete components is met. Moreover, with the circuit, the LED ripple current can be reduced to less than 1.5% substantially.
Description
technical field [0001] The present invention relates to a current ripple elimination circuit, in particular, to an integrated circuit for eliminating load current ripple of a constant current source, a constant current source load drive device comprising the integrated circuit, and a drive device comprising the drive device lighting fixtures. 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 f...
Claims
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IPC IPC(8): H05B37/00
Inventor 许瑞清金红涛刘立国
Owner 中山市模电电子科技有限公司