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CN207851235U - IC short-circuit protection voltage threshold detection circuits - Google Patents

IC short-circuit protection voltage threshold detection circuits Download PDF

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Publication number
CN207851235U
CN207851235U CN201721466203.5U CN201721466203U CN207851235U CN 207851235 U CN207851235 U CN 207851235U CN 201721466203 U CN201721466203 U CN 201721466203U CN 207851235 U CN207851235 U CN 207851235U
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China
Prior art keywords
pins
voltage
detected
modules
short
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Active
Application number
CN201721466203.5U
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Chinese (zh)
Inventor
尤斌
梁米华
杨亭亭
李武岐
袁唯
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Sunwoda Electronic Co Ltd
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Sunwoda Electronic Co Ltd
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Priority to CN201721466203.5U priority Critical patent/CN207851235U/en
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Abstract

The utility model is related to a kind of IC short-circuit protections voltage threshold detection circuits; the working power module of operating voltage is provided including IC modules to be detected and for IC modules to be detected; IC modules to be detected include VM pins, VSS pins and DO pins; detection circuit further includes that both ends are respectively connected to the first resistor R1 of VSS pins and VM pins and are connected to test power module of the VM pins for providing test voltage for VM pins; VSS pins are grounded, and VM pins connect voltage waveform monitoring modular with DO pins.The utility model embodiment is by being equipped with operating voltage module to IC modules output services voltage to be detected; then pass through the first resistor R1 that connects between VSS pins and VM pins; ensure not fall when testing power module output test voltage to VM pins while the normal work for maintaining IC modules to be detected; IC modules to be detected are enable normally to start short-circuit protection, the purpose of voltage threshold and delay when accurately measuring IC module short circuits protection to be detected to realize.

Description

IC short-circuit protection voltage threshold detection circuits
Technical field
The utility model is related to detection circuit technical field, more particularly to a kind of IC short-circuit protections voltage threshold detection electricity Road.
Background technology
It needs to carry out a series of performance test to IC in the production process of IC, such as:To the short of IC used in lithium battery Road protection test, existing testing scheme use between the VM pins and VSS pins in IC connection DC power supply by the way of, By the way that DC power output voltage is adjusted to 1V from 0V moments, changed according to the DO pin voltage waveforms of IC to judge whether IC opens Dynamic short-circuit protection.
But above-mentioned test method cannot accurately measure voltage threshold and the delay of IC short-circuit protections, measurement effect is paid no attention to Think.
Utility model content
The technical problem to be solved by the present invention is to aiming at the deficiencies in the prior art, provide a kind of IC short circuits Protect voltage threshold detection circuit.Voltage threshold and the delay of IC short-circuit protections can accurately be measured.
The utility model solves the technological means that technical problem uses and is to provide a kind of IC short-circuit protections voltage threshold detection Circuit, including IC modules to be detected and the working power module that operating voltage is provided for the IC modules to be detected, it is described to wait for Detection IC modules include VM pins, VSS pins and DO pins, and the detection circuit further includes described in both ends are respectively connected to The first resistor R1 of VSS pins and VM pins and it is connected to test of the VM pins for providing test voltage for VM pins Power module, the VSS pins ground connection, the VM pins connect voltage waveform monitoring modular with DO pins.
Further, the test power module includes the direct voltage source in parallel with the first resistor R1, described straight Cathode is connected to the VSS pins to the anode of galvanic electricity potential source by switch is connected to VM pins.
Further, the output voltage of the direct voltage source is adjustable.
Further, the IC modules to be detected further include VDD pins, and the cathode output end of the operating voltage module connects The VDD pins are connected to, the cathode output end of the operating voltage module is connected to the VSS pins.
Further, the voltage waveform monitoring modular includes oscillograph.
Using above-mentioned technical proposal, the utility model at least has the advantages that:The utility model is by being equipped with work Make voltage module to IC modules output services voltage to be detected, then passes through the VSS pins and VM pins in IC modules to be detected Between connect first resistor R1, the normal operating conditions for maintaining IC modules to be detected while, ensures that testing power module output surveys It tries not fall when voltage to VM pins, IC modules to be detected is enable normally to start short-circuit protection, to realize that accurate measure is waited for Detect the purpose of the voltage threshold and delay when the protection of IC module short circuits.
Description of the drawings
Fig. 1 is the structure diagram of the utility model IC short-circuit protection voltage threshold detection circuits.
Fig. 2 is the electrical block diagram of the utility model IC short-circuit protection voltage threshold detection circuits.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work The every other embodiment obtained, shall fall within the protection scope of the present invention.
It please refers to Fig.1 to Fig. 2, the utility model provides a kind of technical solution:A kind of IC short-circuit protections voltage threshold detection Circuit, including the IC modules U1 to be detected and working power module U2 that operating voltage is provided for the IC modules U1 to be detected, The IC modules U1 to be detected includes VM pins, VSS pins and DO pins, and the detection circuit further includes that both ends connect respectively It is connected to the first resistor R1 of the VSS pins and VM pins and is connected to the VM pins for providing test electricity for VM pins The test power module U3 of pressure, the VSS pins ground connection, the VM pins connect voltage waveform monitoring modular (figure with DO pins Do not show).
In the specific implementation, the IC modules U1 to be detected further includes VDD pins, wherein VDD pins are for connecting The pin of the operating voltage of IC modules U1 to be detected, VSS pins are common ground end pins, and the working power module U2 is used The anode of D.C. regulated power supply V1, the D.C. regulated power supply V1 are connected to the VDD pins, and cathode is connected to the VSS Pin for IC modules U1 to be detected so that provide operating voltage.The voltage waveform monitoring modular uses oscillograph or other use In the instrument of monitoring VM pins and the voltage waveform of DO pins.
The present embodiment by circuit be equipped with working power module U2 give IC modules U1 output services voltages to be detected, Then by the first resistor R1 that connects between the VSS pins and VM pins of IC modules U1 to be detected, IC modules to be detected are maintained Ensure not fall when testing power module V1 output test voltage to VM pins while the normal operating conditions of U1, make to be detected IC modules U1 can normally start short-circuit protection, to realize voltage when accurately measuring IC modules U1 short-circuit protections to be detected The purpose of threshold value and delay.
In one alternate embodiment, the test power module U3 includes the direct current in parallel with the first resistor R1 Cathode is connected to the VSS pins to the anode of potential source V2, the direct voltage source V2 by switch K1 is connected to VM pins. In the specific implementation, the output voltage of the direct voltage source V2 is adjustable.
The present embodiment is designed to the adjustable direct voltage source V2 of output voltage, the direct current by that will test power module U3 Anode output test voltage to VM pins and the cathode of voltage source V2 is grounded, when IC modules U1 to be detected is in normal operating conditions When, the switch K1, which is disconnected, makes the anode of direct voltage source V2 hanging, the voltage value that the direct voltage source V2 is initially exported The minimum value that voltage threshold is protected for the nominal short-circuit of IC modules U1 to be detected, makes direct voltage source V2 by closure switch K1 Apply test voltage to the VM pins of IC modules U1 to be detected and detect the voltage waveform of DO pins and VM pins by oscillograph, Judge whether IC modules U1 to be detected starts short-circuit protection according to the delay length of DO pin voltages overturning, then gradually with The precision of 1mv increases the output voltage of direct voltage source V2 until IC modules U1 to be detected starts short-circuit protection action, at this time directly The output voltage of galvanic electricity potential source V2 is the voltage threshold of the short-circuit protection of IC modules U1 to be detected.
The operation principle of the utility model IC short-circuit protection voltage threshold detection circuits is as follows:
D.C. regulated power supply V1 anode connect with the VDD pins of IC modules U1 to be detected and cathode ground connection while connect To the VSS pins of IC modules U1 to be detected, it is normal that D.C. regulated power supply V1 output voltages 3.8V makes IC modules U1 to be detected enter Working condition, the DO pins and VM pins of IC modules U1 to be detected are connected to oscillograph.
The both ends first resistor R1 be respectively connected to VSS pins and VM pins and the negative pole end of the direct voltage source V2 with VSS pins connect, and the positive terminal of the direct voltage source V2 is connected to VM pins by switch K1 and switch K1 is in and disconnects shape State, setting direct voltage source V2 out-put supplies are that the nominal short-circuit of IC modules U1 to be detected protects the minimum value of voltage threshold, are closed Combination switch K1 makes direct voltage source V2 apply test voltage to the VM pins of IC modules U1 to be detected, while being supervised with oscillograph The voltage waveform for surveying DO pins and VM pins during this judges IC to be detected according to the delay length of DO pin voltages overturning Whether module U1 starts short-circuit protection.
If what IC modules U1 to be detected started is overcurrent protection, by the output voltage of direct voltage source V2 with 1mv precision Gradually it is incremented by, until IC modules U1 to be detected starts short-circuit protection, then the voltage of direct voltage source V2 outputs at this time is as to be checked Survey the voltage threshold of the short-circuit protection of IC modules U1.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention, Equivalent structure or equivalent flow shift made by using the description of the utility model and the drawings, is directly or indirectly transported Used in other related technical areas, similarly it is included in the scope of patent protection of the utility model.

Claims (5)

1. a kind of IC short-circuit protections voltage threshold detection circuit, it is characterised in that:It is waited for including IC modules to be detected and to be described The working power module that IC modules provide operating voltage is detected, the IC modules to be detected include VM pins, VSS pins and DO Pin, the detection circuit further include first resistor R1 and the connection that both ends are respectively connected to the VSS pins and VM pins It is used to provide the test power module of test voltage, the VSS pins ground connection, the VM pins for VM pins to the VM pins Voltage waveform monitoring modular is connected with DO pins.
2. IC short-circuit protections voltage threshold detection circuit according to claim 1, it is characterised in that:The test power supply mould Block includes the direct voltage source in parallel with the first resistor R1, and the anode of the direct voltage source is connected to VM by switch and draws Foot and cathode is connected to the VSS pins.
3. IC short-circuit protections voltage threshold detection circuit according to claim 2, it is characterised in that:The direct voltage source Output voltage it is adjustable.
4. IC short-circuit protections voltage threshold detection circuit according to claim 1, it is characterised in that:The IC moulds to be detected Block further includes VDD pins, and the cathode output end of the working power module is connected to the VDD pins, the working power mould The cathode output end of block is connected to the VSS pins.
5. IC short-circuit protections voltage threshold detection circuit according to claim 1, it is characterised in that:The voltage waveform prison It includes oscillograph to survey module.
CN201721466203.5U 2017-11-03 2017-11-03 IC short-circuit protection voltage threshold detection circuits Active CN207851235U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721466203.5U CN207851235U (en) 2017-11-03 2017-11-03 IC short-circuit protection voltage threshold detection circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721466203.5U CN207851235U (en) 2017-11-03 2017-11-03 IC short-circuit protection voltage threshold detection circuits

Publications (1)

Publication Number Publication Date
CN207851235U true CN207851235U (en) 2018-09-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721466203.5U Active CN207851235U (en) 2017-11-03 2017-11-03 IC short-circuit protection voltage threshold detection circuits

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738791A (en) * 2019-01-29 2019-05-10 郑州云海信息技术有限公司 Device and method for short-circuit protection test before VR chip is powered on

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109738791A (en) * 2019-01-29 2019-05-10 郑州云海信息技术有限公司 Device and method for short-circuit protection test before VR chip is powered on
CN109738791B (en) * 2019-01-29 2021-03-12 苏州浪潮智能科技有限公司 Device and method for testing short-circuit protection before power-on of VR chip

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