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Single-particle transient effect resistance circuit for SCR pulse width modulator

A pulse width modulator, single-event transient technology, applied in electrical components, output power conversion devices, etc., can solve problems such as affecting C1 charging time and large resistance

Inactive Publication Date: 2017-10-10
LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, adding resistor R1 in series with capacitor C1 will not work, this is because the SCR required to maintain the current is particularly small, the resistance required by R1 will be surprisingly large, and it will also affect the resistance of C1 charging time

Method used

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  • Single-particle transient effect resistance circuit for SCR pulse width modulator
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Embodiment 1

[0017] Embodiment 1. This embodiment provides a single event transient effect resistance circuit for an SCR pulse width modulator, including an SCR pulse width modulator with a thyristor SCR structure, an RC buffer, a PNP transistor Q1 and an NPN transistor Transistor Q2.

[0018] The RC buffer is composed of a soft-start capacitor C1, a first resistor R1 and a second resistor R2, wherein R1 and C1 are connected in series between the reference voltage vref of the SCR pulse width modulator and the common ground, and R2 and Q2 are connected in parallel to C1 ends.

[0019] The emitter of the PNP transistor Q1 is connected to the COM terminal of the pulse width modulator, the collector is connected to the common ground, and the base is connected to the soft-start capacitor C1.

[0020] The SCR pulse width modulator targeted in this embodiment is UC1846 / 7.

[0021] The circuit provided in this embodiment refers to figure 2 , figure 2 A circuit for preventing the discharge of...

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Abstract

The invention discloses a single-particle transient effect resistance circuit for an SCR pulse width modulator, which comprises an SCR pulse width modulator with an SCR structure, an RC buffer, a PNP-type triode Q1 and an NPN-type triode Q2. The RC buffer consists of a soft-start capacitor C1, a first resistor R1 and a second resistor R2, wherein R1 and C1 are connected in series between a reference voltage vref of the SCR pulse width modulator and a common ground; after R2 is connected in series with the Q2, they are connected in parallel with the two ends of the C1. The emitting electrode of the PNP-type triode Q1 is connected to the COM terminal of the pulse width modulator; the collecting electrode is connected to the common ground, and the base electrode is connected to the soft-start capacitor C1. The invention can prevent a working pulse-width modulator from discharging the soft-start capacitor when it encounters an SEU event and at the same time allows the time required for the charging of the soft-start capacitor when it is restarted to be consistent with the time for the charging of the soft-start capacitor when it is started normally.

Description

technical field [0001] The invention provides a single-event transient effect resistance circuit for an SCR pulse width modulator, which belongs to the technical field of switching power supplies. Background technique [0002] UC1846 / 7 pulse width modulator is a commonly used controller in switching power supply at present, its use can greatly reduce the complexity of switching power supply circuit and reduce the number of circuit components used. The UC1846 / 7 pulse width modulator integrates a soft start circuit and a protection circuit inside. Just connect an external soft-start resistor, voltage divider resistor, and soft-start capacitor to realize that UC1846 / 7 slowly charges the soft-start capacitor at startup to control the startup speed of the switching power supply; when the output is short-circuited or overvoltage, UC1846 / 7 can discharge the external soft-start capacitor and restart the power supply to protect the power supply and load. However, the UC1846 / 7 inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/36
CPCH02M1/32H02M1/36H02M1/325
Inventor 王其岗李毅军赵斌荣焱李斌马文博
Owner LANZHOU INST OF PHYSICS CHINESE ACADEMY OF SPACE TECH
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