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Hysteresis protective circuit of device power source

A technology for protecting circuits and power supplies, applied in electrical components, output power conversion devices, etc., can solve problems such as troublesome power supply of operational amplifiers or comparators, and achieve the effect of low cost and simple circuit

Active Publication Date: 2014-01-01
XIAMEN YAXON NETWORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solution is to realize the hysteresis protection function by controlling the switch of the device power supply by forming a hysteresis comparator through an op amp. However, when the device power supply (such as: DCDC converter) is not working, the power supply of the op amp or comparator is troublesome. question

Method used

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  • Hysteresis protective circuit of device power source
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  • Hysteresis protective circuit of device power source

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Embodiment Construction

[0018] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0019] figure 1 Shown is the principle of the equipment power supply hysteresis protection circuit of the present invention, which is composed of resistors, diodes and triodes. The circuit diagram is specifically: two resistor divider networks are connected in parallel between the positive pole POWER and the negative pole PGND of the equipment power supply, in which the first path is composed of the third resistor R3 and the fifth resistor R5 in series, and the second path is composed of the first resistor R1 and the fifth resistor R5. The four resistors R4 and the sixth resistor R6 are connected in series in sequence, and the positive pole POWER of the equipment power supply is also connected in series with a second resistor R2, which are respectively connected to the collector c of the first triode Q1 and the base of the second triode Q2 Pole b, t...

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Abstract

The invention relates to the field of electronic circuits. According to a hysteresis protective circuit of a device power source, two resistor potential-divider networks are connected in parallel between a positive electrode and a negative electrode of the device power source, the first resistor potential-divider network is formed by a resistor R3 and a resistor R5 which are connected in series, the second resistor potential-divider network is formed by a resistor R1, a resistor R4 and a resistor R6, wherein the resistor R1, the resistor R4 and the resistor R6 are sequentially connected in series, after a resistor R2 is further connected with the positive electrode of the device power source in series, the positive electrode of the device power source is respectively connected to a collector electrode of a triode Q1 and a base electrode of a triode Q2, an emitting electrode of the triode Q1 and an emitting electrode of the triode Q2 are respectively connected to the negative electrode of the device power source, after the middle end of the resistor R3 and the middle end of the resistor R5 are in series connection with a diode D1 which is in forward connection, the middle end of the resistor R3 and the middle end of the resistor R5 are connected to a base electrode of the triode Q1, the middle end of the resistor R1 and the middle end of the resistor R4 are connected to a collector electrode of the triode Q2, after the middle end of the resistor R4 and the middle end of the resistor R6 are in series connection with a diode D2 which is in forward connection, the middle end of the resistor R4 and the middle end of the resistor R6 are connected to the base electrode of the triode Q1, the collector electrode of the triode Q2 is an output control end of the circuit and controls the device power source to be switched on or off. According to the hysteresis protective circuit of the device power source, the functions of hysteresis protection and under-voltage protection are achieved.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a control circuit of a power supply. Background technique [0002] When the power supply of the existing equipment fluctuates, due to the frequent switching of the power supply of the whole machine, the equipment resets, impacts the power supply and the internal circuit, and often causes damage to the equipment; Voltage cut-off protection (that is, the battery power is turned off when the battery voltage is insufficient). Therefore, an effective means to prevent this problem is needed. The traditional solution is to realize the hysteresis protection function by controlling the switch of the device power supply by forming a hysteresis comparator through an op amp. However, when the device power supply (such as: DCDC converter) is not working, the power supply of the op amp or comparator is troublesome. question. Contents of the invention [0003] Therefore, the present inve...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 叶志聪蔡运文吴振达肖振隆蔡炎平
Owner XIAMEN YAXON NETWORKS CO LTD
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