A Voltage Sampling Circuit Applied to Primary Side Feedback Flyback Converter
A technology of flyback converter and primary side feedback, which is applied in the direction of converting DC power input to DC power output, instruments, electronic switches, etc. It can solve the problems of complex circuit structure and difficulty in achieving high precision, and achieve simple circuit structure , The effect of high sampling accuracy
Active Publication Date: 2020-01-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF1 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] Digital control methods can provide high sampling accuracy, but the circuit structure is often very complex
The circuit structure of the analog method is simple, but it is difficult to achieve high precision
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 Construction
[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0042] Such as figure 2 Shown is a schematic structural diagram of a voltage sampling circuit applied to the primary side feedback flyback converter proposed by the present invention, including a sampling control signal generation circuit, a sampling signal gating circuit and at least two parallel sampling units, the sampling unit It includes a sampling switch, a sampling and holding capacitor and a transmission switch. The sampling switch and the transmission switch are connected in series. The series point is grounded after passing through the sampling and holding capacitor. The other end of the sampling switch is used as the input terminal of the sampling unit, and the other end of the transmission switch is used as the output of the sampling unit. terminal; the input terminals of each sampling unit are connected and connected as the input ...
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 relates to a voltage sampling circuit applied to a primary-side feedback flyback converter, which belongs to the technical field of power electronics. It includes a sampling control signal generation circuit, a sampling signal gating circuit and at least two parallel sampling units. The sampling unit includes a sampling switch, a sampling and holding capacitor and a transmission switch. The sampling switch transmits the signal to be sampled at the power level to the sampling and holding capacitor; the sampling and holding The capacitor stores the sampling voltage; the transmission switch outputs the appropriate sampling voltage; the sampling control signal generation circuit is used to generate control signals to respectively control the sampling switches in the sampling unit to turn on sequentially, so that the sampling and holding capacitor stores the corresponding sampling voltage; the sampling signal is gated The circuit judges that the system works in CCM or DCM mode, generates a strobe signal to control the transmission switch in the corresponding sampling unit to be turned on, and sends out the sampling value closest to the real value. The circuit structure of the invention is simple, the sampling precision is high, and it can work normally in the current continuous mode CCM and the current discontinuous mode DCM.
Description
technical field [0001] The invention belongs to the technical field of power electronics and relates to a voltage sampling circuit applied to a primary-side feedback flyback converter. Background technique [0002] The flyback converter has been widely used due to its advantages of simultaneous step-up and step-down, and electrical isolation between input and output. The primary side feedback technology detects the change of the output voltage by adding an auxiliary winding on the transformer. The voltage sampling accuracy is high, which can achieve higher output accuracy and faster dynamic response. The key to high-precision voltage sampling lies in the search for the sampling point. When the energy of the primary side is transferred to the secondary side, the secondary side current flows through the secondary side rectifier diode, which will cause a significant voltage drop on the diode, thus affecting the accuracy of the sampling voltage. . In order to improve the sampl...
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 Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H03K17/96
CPCH02M3/335H03K17/962
Inventor 罗萍缪昕昊张辽周泽坤张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA