Current source circuit and control system
A current source and circuit technology, applied in the field of electronics, can solve the problems of high natural cost, complex circuit structure, and large number of components, and achieve the effects of high operational reliability, strong compatibility, and rich choices
Active Publication Date: 2021-07-16
苏州福瑞思信息科技有限公司 +1
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Problems solved by technology
[0004] Various control methods in the current technology have their own disadvantages. Some cannot realize precise control of the output current, and some cannot realize continuous and intelligent current regulation. The circuit structure that can realize both functions at the same time is relatively complex, with a large number of components The larger the territory, the higher the natural cost
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[0049] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, only a part of the embodiments of the present invention, not all the embodiments, and are not intended to limit the present invention.
[0050]The inventors have found that there are various ways to realize the circuit that provides the gate voltage for the power switch electrically connected to the current half-bridge drive circuit, and these circuits either cannot realize the precise control of the output current of the half-bridge drive circuit, and the output current is easy to control. Affected by different external devices, voltage or temperature; or the output current of the half-bridge drive circuit is limited ...
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The invention provides a current source circuit and a control system, and relates to the field of electronics. The current source circuit is used for controlling the output current of a half-bridge drive circuit and comprises a reference current module, a pulse width modulation module and a mirror current module. The reference current module is electrically connected with the pulse width modulation module and the mirror current module respectively, the pulse width modulation module is electrically connected with the reference current module and the mirror current module respectively, and the mirror current module is electrically connected with the reference current module and the pulse width modulation module respectively and used for generating the output current of the half-bridge drive circuit according to reference current and a pulse width modulation signal. The current source circuit disclosed by the invention not only can output a continuous and accurate current, but also can realize intelligent and automatic regulation and control of the output current; and the whole current source circuit uses few components, the circuit is simple, the operation reliability is very high, the compatibility of the current source circuit is strong, and the choices of users are greatly enriched.
Description
technical field [0001] The invention relates to the field of electronics, in particular to a current source circuit and a control system. Background technique [0002] The half-bridge drive circuit is a power integrated circuit, which is widely used in electronic ballasts, motor drives and other DC-AC circuits. The half-bridge drive circuit receives digital control signals from the CPU or MCU, and outputs signals to control and drive the gates of power MOSFET devices or IGBT devices. [0003] The core part of the half-bridge drive circuit is the output gate drive circuit, which has various implementations, such as: figure 1 The simple switch driving circuit shown in (a), the working power supply V GATE A PMOS transistor 10 and an NMOS transistor 11 are connected in series to output, and an NMOS transistor 12 with a diode is controlled to control the output current V of the half-bridge drive circuit. DRAIN goals; such as figure 1 (b) The digitally controlled current drive...
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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 裘伟光刘志
Owner 苏州福瑞思信息科技有限公司