Further linearization circuit based on linear photoelectric coupler, and realization method thereof
A technology of optocoupler and realization method, which is applied in the direction of logic circuits using optoelectronic devices, logic circuits using specific components, etc., can solve the problems of high cost, large volume, and complex isolation amplifier circuits, and achieves improved accuracy and improved linearity. degree of effect
Active Publication Date: 2016-10-26
叶克江
View PDF4 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The internal circuit of the integrated isolation amplifier is complex, large in size and high in cost, so it is not suitable for large-scale applications
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0037] This embodiment is based on figure 2 A typical application schematic diagram of a linear optocoupler HCNR201 to achieve isolation and further linearization of some of the actual circuit such as image 3shown. U6 is a linear optocoupler HCNR201, U2, U3, and U7 are dual operational amplifiers (referred to as operational amplifiers) AD822, U1 is a quad operational amplifier AD824, U8 is a dual 100K digital potentiometer MAX5415, U4 is a quad analog switch MAX4604, and U5 is a dual 10-bit digital-to-analog voltage converter LTC1661, G15V is the isolated 15V power supply of the input terminal (isolated terminal or front end), N is the ground wire of the input terminal, L is the input point of the input terminal current 4 ~ 20mA, and the current passes through the resistor R6 = 250 ohms are converted to a voltage of 1-5V (when the resistor R6 is canceled, L becomes the input point of the isolated voltage signal). Resistor R7 = 550 kilohms equivalent figure 2 In R1, the w...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a further linearization circuit based on a linear photoelectric coupler, and a realization method thereof. The circuit comprises the linear photoelectric coupler (called an optocoupler for short) U6, a first dual-operation amplifier (called an operational amplifier for short) U2, a second dual-operation amplifier U3, a third dual-operation amplifier U7, a fourth operational amplifier U1, a digital potentiometer U8, fourth analogue switches U4 and a digital-to-analogue voltage converter U5; the B set of potentiometers of the U8 is used for roughly adjusting the slope of the original output voltage V3; the B set of output voltage TJD of the U5 is a critical point voltage value; the first set of operational amplifiers of the U7 forms a comparator; V3 is compared with the TJD, such that whether the VK is high level or low level can be determined; therefore, the first set of analogue switches of the U4 is invalidly disconnected or effectively closed; the VY and the V3 are not communicated or connected; the A set of potentiometer taps of the U8 outputs WA, which is buffered by the second set of operational amplifiers of the U7 and then coupled to the VA through a resistor R13; and thus, further linear compensation is realized. According to the further linearization circuit based on the linear photoelectric coupler, and the realization method thereof disclosed by the invention, ultra-high-precision analogue signal isolation is realized by utilizing the linear photoelectric coupler; and thus, the limit precision is better than 0.01%.
Description
technical field [0001] The invention relates to the research field of linear optocoupler, in particular to a further linearized circuit based on linear optocoupler and its realization method. Background technique [0002] Wherever signal isolation or conversion is required, a signal isolator is required. Its application field has almost nothing to do with the industry, because any industry may require signal isolation transmission, transformation transmission or acquisition control. There are three types of linear isolation methods for analog signals: electromagnetic isolation, capacitive coupling isolation, and photoelectric isolation. Their own physical characteristics, that is, the limit linearity is 0.1%, which determines the limit accuracy of various signal isolator products. Both are 0.1%. The function of signal isolation is to solve the problem of ground circulation interference (especially the problem that strong and weak current ground wires cannot be directly con...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H03K19/14
CPCH03K19/14
Inventor 叶克江
Owner 叶克江