Forward converter voltage error feedback magnetic isolation method and magnetic isolation circuit
A forward converter, voltage error technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve the problem of low stability of magnetic isolation power supply, low output voltage stability, and difficult components Obtaining and other issues, to achieve the effect of low cost, high reliability, and easy components
Active Publication Date: 2012-09-26
BEIJING INST OF CONTROL ENG
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Problems solved by technology
Some existing magnetically isolated power supplies use the main transformer winding feedback method to control the output voltage. Due to the differences between the transformer winding voltage and the output voltage, there are rectifier diodes, filter inductance and load differences, resulting in low output voltage stability. In addition, some The magnetic isolation power supply uses a dedicated chip plus a PWM chip to achieve magnetic isolation. It needs a special auxiliary power supply to power it and the peripheral components of the chip to make it work normally. Therefore, the existing magnetic isolation power supply has low stability or complex circuits. High, high cost, and the disadvantages that components are not easy to obtain
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[0023] Such as figure 1 As shown, a forward converter voltage error magnetic isolation method, the steps are as follows:
[0024] (1) Collect the square wave and output voltage formed after the secondary rectification of the forward converter;
[0025] (2) converting the above output voltage into an output voltage error signal;
[0026] (3) utilize the square wave signal described in step (1) to form a square wave with an output voltage error signal on the primary side winding of the isolation magnetic ring;
[0027] (4) The isolation magnetic ring couples the square wave of the output voltage error signal to the secondary side, and forms a DC signal with the output voltage error signal through rectification;
[0028] (5) Send the DC signal to the control terminal of the forward converter. The output voltage of the forward converter can be precisely controlled through the direct current signal, so as to achieve the purpose of isolating the primary and secondary sides of the...
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The invention relates to a forward converter voltage error feedback magnetic isolation method and a magnetic isolation circuit. The magnetic isolation circuit comprises a rectification circuit (2) and an output voltage error signal circuit (3) consisting of an isolation magnetic ring L1, a dynatron Q1 and a three terminal regulator. A forward converter secondary rectification output end is connected to a base electrode of the dynatron Q1 after being connected with a resistor R1 in series, a collector electrode of the dynatron Q1 is connected to one end of a primary side of the isolation magnetic ring L1, the other end of the primary side of the isolation magnetic ring L1 is connected to a forward converter output voltage end, the primary side of the isolation magnetic ring L1 is connectedto the rectification circuit (2), the rectification circuit (2) is connected to a control end of a forward converter, one end of a demagnetization winding side of the isolation magnetic ring L1 is connected to the forward converter output voltage end, the other end is connected to a cathode of a diode D2, an anode of the diode D2 is connected to a forward converter output end, an emitting electrode of the dynatron Q1 is connected to an output end of the output voltage error signal circuit (3), and the forward converter output voltage end is an input end of the output voltage error signal circuit (3).
Description
technical field [0001] The invention relates to a voltage error feedback magnetic isolation circuit and an isolation method, which can be used as a secondary power supply for all space satellites, ships, etc., and ground secondary power supplies that require magnetic isolation and high stability. Background technique [0002] The key to the high stability of the voltage error feedback magnetic isolation circuit is to send the error signal of the output voltage of the secondary side through the magnetic isolation ring to the primary side to participate in the control of the power supply. Some existing magnetically isolated power supplies use the main transformer winding feedback method to control the output voltage. Due to the differences between the transformer winding voltage and the output voltage, there are rectifier diodes, filter inductance and load differences, resulting in low output voltage stability. In addition, some The magnetic isolation power supply uses a dedic...
Claims
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IPC IPC(8): H02M3/338
Inventor 孙定浩彭政彭勃杜建华李山
Owner BEIJING INST OF CONTROL ENG