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Low-EMI booster circuit and device using same

A technology of booster circuit and booster device, which is applied in the field of electric power, can solve problems such as high cost, complex structure, and large EMI noise, and achieve the effects of reducing EMI noise, simplifying the circuit, and reducing costs

Active Publication Date: 2013-09-04
SHENZHEN ZHENBANG TECH
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide a low-EMI boost circuit, aiming to solve the problem that the existing boost circuit has relatively large EMI noise and needs to perform slope compensation, so that not only the structure is complex, but also the cost is high

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  • Low-EMI booster circuit and device using same

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0017] The low EMI step-up circuit provided by the present invention is mainly used in occasions where the input DC voltage is boosted, the output power is relatively large, and the requirement for EMI is relatively high. This circuit adopts the bang-bang control principle to directly control the current in the boost inductor, thereby indirectly controlling the output voltage. Due to the soft characteristics of the control loop, the on-cycle and off-cycle of the control signal will vary according to the load, resulting in control frequency, jitter, and thus greatly reducing EMI noise.

[0018] f...

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Abstract

The invention is applicable in the power field, and provides a low-EMI booster circuit and a device using the same. In the embodiment of the invention, current in a booster inductor is directly controlled so as to indirectly control the output voltage. A special current loop is adopted, and the opening period and the closing period of a control signal are changed according to the change of a load to cause jittering of control frequency, so the EMI noise is greatly reduced. The gradient when the current is raised and reduced is not changed, so gradient compensation is not needed, the circuit is simplified, and the cost is reduced.

Description

technical field [0001] The invention belongs to the field of electric power, in particular to a low-EMI step-up circuit and a device using the circuit. Background technique [0002] Boost circuits are used in a wide range of applications, especially in applications where batteries are used but the target voltage is higher than the supply voltage. At present, there are two main boosting technologies: 1. Use a low-voltage power supply to charge multiple capacitors one by one, and then use an electronic switch to connect them in series to output a higher voltage. Through the control of the electronic switch, the charging and discharging are carried out regularly and alternately, so that the power source is continuously sent to the load. This control method is generally called a charge pump method. Its main disadvantages are: it is limited to low-power applications, such as RS232 drive circuits; the circuit has a lot of noise, due to the fact that there is a large injection cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/44
Inventor 邓伟陈志杰
Owner SHENZHEN ZHENBANG TECH
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