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Power supply for functional safety product

A functional safety and product technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of isolation transformers such as easy magnetic saturation, achieve the effect of saving windings and turns, improving the utilization rate of magnetic cores, and reducing volume

Inactive Publication Date: 2015-05-13
NANJING NEW POWER ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] Purpose of the invention: The present invention proposes a functionally safe power supply, which solves the problem that the isolation transformer is easily magnetically saturated

Method used

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  • Power supply for functional safety product
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Embodiment Construction

[0039] Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

[0040] Such as figure 1 As shown, the first EMC circuit includes a second common-mode inductor L2 and a third common-mode inductor L3 connected in series, and a thirty-first capacitor C31 and a thirty-third capacitor C33 connected in parallel at the output ends of the second and third common-mode inductors . These common-mode inductors and capacitors filter out the common-mode electromagnetic interference on the signal line on the one hand, and on the other hand suppres...

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Abstract

The invention discloses a power supply for a functional safety product. The power supply comprises an isolation transformer. Input voltage is input into a primary coil of the isolation transformer after passing through a first EMC circuit, a voltage limit current limit protection circuit, a DC / DC chip and a full-bridge overload protection driving circuit. The isolation transformer has two secondary coils which are closed in turn in two working hours and are connected with a 25th rectifier bridge and a 29th rectifier bridge, and voltage is filtered by a first filtering circuit and a second filtering circuit to be output. The power supply solves the problem that the existing isolation transformer is easy to saturate.

Description

technical field [0001] The invention relates to a power supply for functional safety products, belonging to the field of power supply for functional safety products of industrial process measurement and control systems. Background technique [0002] At present, the design of functional safety power supply combined with the requirements of IEC61508 needs to be as follows: [0003] 1. Overvoltage protection and safety cut off or switch to backup power supply. [0004] 2. Voltage control and safety shutdown or switching to backup power unit (secondary). [0005] 3. With safety power off or switch to backup power supply unit. [0006] 4. Protection measures to prevent voltage breakdown, voltage fluctuation, overvoltage and low voltage. [0007] 5. Separate the power line and the information line. [0008] 6. Measures against physical environment (such as temperature, humidity, water, vibration, dust, corrosion). [0009] 7. Electromagnetic compatibility meets the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M1/32
CPCH02M1/40
Inventor 董健谢忠诚董伟
Owner NANJING NEW POWER ELECTRIC