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High-power negative pressure numerical control constant current module

A constant-current module, high-power technology, applied in the field of power ASIC, can solve the problems of effectively isolating the digital circuit part and the analog circuit part, and cannot work under negative voltage conditions, and achieves low power consumption and adjustable current range. Wide, easily adjustable effect

Inactive Publication Date: 2011-07-13
浙江财经学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The application of the above-mentioned devices works under the condition of positive voltage, and cannot work under the condition of negative voltage, and does not solve the effective isolation of the digital circuit part and the analog circuit part

Method used

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  • High-power negative pressure numerical control constant current module
  • High-power negative pressure numerical control constant current module
  • High-power negative pressure numerical control constant current module

Examples

Experimental program
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Embodiment Construction

[0020] As shown in the figure, a high-power negative-voltage numerical control constant-current module includes a D / A conversion chip U1, a photoelectric isolator U2, an operational amplifier A, a feedback unit B, and a VMOS field effect transistor VT. The input digital signal is sequentially converted by the D / A conversion chip U1 and the photoelectric isolator U2 into the positive phase terminal of the operational amplifier A, and the feedback unit feeds back the gate voltage and source voltage of the VMOS field effect transistor VT to the negative terminal of the operational amplifier A At the phase end, the operational amplifier A outputs a control signal to the gate of the VMOS field effect transistor VT after comparison operation, and controls the drain of the VMOS field effect transistor VT to output a constant current.

[0021] The D / A conversion chip adopts serial digital-to-analog conversion, and the external resistor R10 makes the D / A reference power supply adjustabl...

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PUM

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Abstract

The invention discloses a high-power negative pressure numerical control constant current module, comprising a D / A (Digital / Analog) conversion chip, a photoelectronic isolator, an operational amplifier, a feedback unit and a VMOS (Vertical Metal Oxide Semiconductor) field effect transistor. An input digital signal is sequentially converted by the D / A conversion chip and the photoelectronic isolator and is then input to the positive phase terminal of the operational amplifier, the feedback unit feeds the grid voltage and the source voltage of the VMOS field effect transistor back to the negative phase terminal of the operational amplifier, and the operational amplifier outputs a control signal to the grid of the VMOS field effect transistor after comparison operation so as to control the drain of the VMOS field effect transistor to output a constant current. In the module provided by the invention, under the condition that the resolution of the input digital signal is 10 bits, an output current is varied in 1024 levels in the current range of 0-3A and the input control range of 0-1024 level digital signal, the initial voltage is more than or equal to minus 0.5V, the current stability is 9.9*10<-5>, the current temperature coefficient is 4.8*10<-5>, and the maximum power consumption is 30W.

Description

technical field [0001] The invention belongs to the technical field of power ASICs, and in particular relates to a high-power negative pressure numerical control constant current module. Background technique [0002] The numerical control constant current module is proposed under the condition that the traditional constant current device cannot be replaced. It is a constant current module characterized by digital signal control output current. It not only has a wide adjustable range of output current, a wide range of allowable operating voltage changes, and a circuit interface compatible with TTL, but also has a small size, easy adjustment, and excellent electrical performance. It can be widely used in technical fields that traditional constant current devices cannot set foot in, and has unique advantages in the application of digital circuit technology. [0003] Sheng Fasheng and others disclosed a DCM02 constant current module (Sheng Fasheng, Fan Yajun, Lu Pinzhen. Design...

Claims

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Application Information

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IPC IPC(8): G05F1/46
Inventor 盛法生
Owner 浙江财经学院
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