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Diode absorption circuit for bridge rectifier circuit

A technology of bridge rectifier circuit and snubber circuit, which is applied in the electronic field and can solve the problem of large loss of snubber resistor R1

Active Publication Date: 2008-10-08
O&C ELECTRIC TECHN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of the traditional snubber circuit is that the loss on the snubber resistor R1 is quite large, and the snubber resistor R1 should use a larger power resistor

Method used

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  • Diode absorption circuit for bridge rectifier circuit
  • Diode absorption circuit for bridge rectifier circuit
  • Diode absorption circuit for bridge rectifier circuit

Examples

Experimental program
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Embodiment 1

[0021] Diode snubber circuits used in bridge rectifier circuits such as image 3 As shown, the diode snubber circuit is composed of C3, D9, R2, and D10. C3 is generally a non-inductive absorbing capacitor between 1nF and 10nF, and R2 is generally a absorbing resistor ranging from 10 ohms to 100 ohms. D9 and D10 cooperate with C3 and R2 to complete the absorbing function. L2 is a filter inductor, which together with the filter capacitor C4 completes the smooth filtering of the pulsating voltage after bridge rectification on the secondary side of the transformer to ensure that the output voltage Vo2 is a smooth DC.

[0022] In this example, the primary and secondary side voltage waveforms of transformer T2 are as follows Figure 4 shown.

[0023] The advantage of the diode snubber circuit in this example is that the loss on the resistor R2 is smaller than that of the traditional circuit, and the snubber effect is almost the same. The specific analysis is as follows:

[0024]...

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PUM

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Abstract

The invention discloses a diode absorbing circuit in bridge type rectification circuit, which comprises a rectification bridge, an inductance L2 and a capacitance C4, one end of the inductance L2 is connected with an output end P of the rectification bridge, the other end M of the inductance L2 is connected with the positive pole of the capacitance C4, the negtive pole of the capacitance C4 is connected with the other output end Q of the rectification bridge, the diode absorbing circuit also comprises a capacitance C3, a resistance R2, diodes D9 and D10; one end of the capacitance C3 is connected with an output end P of the rectification bridge, the other end of the capacitance C3 is connected with the negtive pole of the diode D9, the positive pole of the diode D9 is connected with the output end Q of the rectification bridge; one end of the resistance R2 is connected with the negtive pole of the diode D9, the other end of the resistance R2 is connected with the positive pole of the diode D10, the negtive pole of the diode D10 is connected with the M end of the inductance L2. The diode absorbing circuit in bridge type rectification circuit can evidently reduce the energy consumption of dead resistance in the bridge type rectification circuit.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to a diode absorbing circuit used in a bridge rectifier circuit. Background technique [0002] In a switching power supply with high voltage output, if the output voltage is greater than 100V, the secondary output is often used in a bridge rectifier circuit. Due to the existence of transformer leakage inductance, the diode will generate a high voltage spike when it is turned off, and the excessive voltage The spike will damage the diode, so a spike suppression circuit is often added to absorb the voltage spike to protect the diode. [0003] In the traditional bridge conversion circuit, the conventional voltage spike suppression circuit (that is, the diode snubber circuit) is to add an RC resistance-capacitance snubber circuit to the secondary winding of the transformer. Traditional diode snubber circuits such as figure 1 R1 and C1 in the circuit shown. In the traditional bridge ...

Claims

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Application Information

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IPC IPC(8): H02M7/06H02M1/32
Inventor 赵林冲汤世娟
Owner O&C ELECTRIC TECHN CO LTD
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