CN203553913U - Main controller overvoltage protection circuit and large-screen splicing system - Google Patents

Main controller overvoltage protection circuit and large-screen splicing system Download PDF

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Publication number
CN203553913U
CN203553913U CN201320628478.XU CN201320628478U CN203553913U CN 203553913 U CN203553913 U CN 203553913U CN 201320628478 U CN201320628478 U CN 201320628478U CN 203553913 U CN203553913 U CN 203553913U
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China
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external power
resistance
output
power source
module
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CN201320628478.XU
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Chinese (zh)
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伊超超
黄忠山
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Shenzhen Skyworth Qunxin Security Technology Co Ltd
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Chuangwei Quanxin Safety And Protection Science And Technology Co Ltd Shenzh
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Abstract

This utility model discloses a main controller overvoltage protection circuit and a large-screen splicing system having the same. The overvoltage protection circuit is used for performing overvoltage protection on a main controller. The main controller is connected to an external power supply. The overvoltage protection circuit comprises a voltage stabilization module, a comparison module and a protection module. The input terminal of the voltage stabilization module is connected to the external power supply, and the output terminal of the voltage stabilization module is connected to the input terminal of the reference voltage of the comparison. The input terminal of the external power supply of the comparison module is connected to the external power supply and the output terminal of the comparison is connected to the protection circuit. When the overvoltage is appeared on the external power supply, the comparison module outputs level signals and the control protection module cuts off the connection between the main controller and the external power supply so as to prevent the main controller from the overvoltage damage and improve the reliability of the whole circuit system.

Description

Master controller overvoltage crowbar and large-screen splicing system
Technical field
The utility model relates to technical field of electronic equipment, particularly relates to a kind of master controller overvoltage crowbar and large-screen splicing system.
Background technology
Existing in large-screen splicing system, often by the voltage of voltage stabilizing circuit stable output, system (control chip) is powered.When voltage stabilizing circuit occurs that overvoltage or large electric current appear in special circumstances or power supply, voltage or large electric current can burn out control chip or matrix switching chip.Chip is impaired cannot normally splice large-screen splicing by causing large-screen to lose Liao Yi road signal or multiple signals in splicing, even makes whole splicing system integral body break down, thereby reduces the reliability of whole system.
Utility model content
Main purpose of the present utility model is to provide a kind of master controller overvoltage crowbar, is intended to realize to master controller the overvoltage protection under circuit abnormality situation, improves the reliability of whole circuit or system.
To achieve these goals, the utility model provides a kind of master controller overvoltage crowbar, and for master controller is carried out to overvoltage protection, described master controller is connected with external power source, and described overvoltage crowbar comprises:
Voltage stabilizing module, receives the voltage that described external power source is exported, and stable output voltage;
Comparison module, comprise reference voltage input terminal, external power source input and output, described reference voltage input terminal receives the burning voltage of described Voltage stabilizing module output and using this voltage as with reference to voltage, described external power source input receives the voltage of described external power source output, the voltage of the more described reference voltage of described comparison module and external power source input, and according to comparative result the output outputs level signals by described comparison module;
Protection module, receives the level signal that described comparison module is exported, and when the voltage of described external power source input is greater than described reference voltage, described protection module controls described master controller and described external power source disconnects;
The input of described Voltage stabilizing module is connected with described external power source, and output is connected with the reference voltage input terminal of described comparison module; The external power source input of described comparison module is connected with described external power source, and output is connected with described protective circuit.
Preferably, described comparison module comprises the first dividing potential drop submodule, the second dividing potential drop submodule, feedback resistance and operational amplifier, described first input of dividing potential drop submodule and the output of described Voltage stabilizing module are connected, and described first output of dividing potential drop submodule and the first input end of described operational amplifier are connected; The input of described the second dividing potential drop submodule is connected with described external power source, the output of described the second dividing potential drop submodule is connected with the second input of described operational amplifier, the output of described operational amplifier is as the output of described comparison module, and the output of described operational amplifier is connected with the second input through feedback resistance.
Preferably, described the first dividing potential drop submodule comprises the first resistance and the second resistance, one end of described the first resistance is connected with the output of described Voltage stabilizing module, the other end of described the first resistance is connected with the second resistance, described the second grounding through resistance, described the first resistance is connected with described operational amplifier first input end with the node between described the second resistance.
Preferably, described the second dividing potential drop submodule comprises the 3rd resistance and the 4th resistance, one end of described the 3rd resistance is connected with described external power source, the other end of described the 3rd resistance is connected with the 4th resistance, described the 4th grounding through resistance, described the 3rd resistance is connected with the second input of described operational amplifier with the node between described the 4th resistance.
Preferably; described protection module comprises switch submodule and power supply connexon module; the input of described switch submodule is connected with the output of described comparison module; the output of described switch submodule is connected with described power supply connexon module, and controls the connecting and disconnecting of described power supply connexon module according to the level signal of comparison module output.
Preferably, described switch submodule comprises the 5th resistance and triode, described the 5th resistance one end is as the input of switch submodule, described the 5th other end of resistance and the base stage of described triode are connected, the collector electrode of described triode is as the output of switch submodule, the grounded emitter of described triode.
Preferably, described power supply connexon module comprises the relay being switched on or switched off for controlling described master controller and described external power source, described relay comprises two control ends, one control end is connected with the output of described Voltage stabilizing module, another control end is through described switch submodule ground connection, and by controlling, obtaining of described relay is electric or dead electricity is controlled described master controller and described external power source is switched on or switched off.
The utility model provides a kind of large-screen splicing system, and this large-screen splicing system has master controller overvoltage crowbar, and described master controller is connected with external power source, and described overvoltage crowbar comprises:
Voltage stabilizing module, receives the voltage that described external power source is exported, and stable output voltage;
Comparison module, comprise reference voltage input terminal, external power source input and output, described reference voltage input terminal receives the burning voltage of described Voltage stabilizing module output and as with reference to voltage, described external power source input receives the voltage of described external power source output, the voltage of the more described reference voltage of described comparison module and external power source input, and according to comparative result the output outputs level signals by described comparison module;
Protection module, receives the level signal that described comparison module is exported, and when the voltage of described external power source input is greater than described reference voltage, described protection module controls described master controller and described external power source disconnects;
The input of described Voltage stabilizing module is connected with described external power source, and output is connected with the reference voltage input terminal of described comparison module; The external power source input of described comparison module is connected with described external power source, and output is connected with described protective circuit.
The utility model is by Voltage stabilizing module, comparison module and protection module are set, and the burning voltage that Voltage stabilizing module is exported is the reference voltage of module as a comparison, and external power source exports another input of comparison module to.Comparison module carries out differential comparison by external power source and reference voltage, detects in real time the voltage status of external power source.When overvoltage appears in external power source, comparison module is by outputs level signals, and control protection module cut-out master controller is connected with external power source, thereby avoided master controller to be subject to overvoltage, damages, and has improved the reliability of whole Circuits System.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model master controller overvoltage crowbar one embodiment;
Fig. 2 is the module diagram of Voltage stabilizing module one embodiment in Fig. 1.
The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
With reference to Fig. 1 and 2, Fig. 1 is the structural representation of the utility model master controller overvoltage crowbar one embodiment; Fig. 2 is the module diagram of Voltage stabilizing module one embodiment in Fig. 1.A kind of master controller overvoltage crowbar that the present embodiment provides, master controller is connected with external power source VCC, and overvoltage crowbar comprises Voltage stabilizing module 1, comparison module 2 and protection module 3.Wherein, comparison module 2 comprises reference voltage input terminal, external power source input and output, reference voltage input terminal receives the burning voltage of Voltage stabilizing module 1 output and using this voltage as with reference to voltage, external power source input receives the voltage of external power source VCC output.The input of Voltage stabilizing module 1 is connected with external power source VCC, and output is connected with the reference voltage input terminal of comparison module 2.The external power source input of comparison module 2 is connected with external power source VCC, and output is connected with protective circuit.
Voltage stabilizing module 1, receives the voltage that external power source VCC exports, and stable output voltage.Voltage stabilizing module 1 comprises voltage stabilizing chip.This chip should be noted that voltage stabilizing chip can select according to actual conditions, as long as can be realized the voltage stabilizing by external power source VCC.Voltage stabilizing module 1 also comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7 and the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9 and inductance L.In the present embodiment, voltage stabilizing chip is selected RT8292, and this voltage stabilizing chip comprises power input VIN, Enable Pin EN, soft start end SS, earth terminal GND, compensation node side COMP, feedback input end FB, switching node end SW, and leading end BOOT.Described power input VIN is through the first capacitor C 1 ground connection, and power input VIN is connected with Enable Pin EN through the 6th resistance R 6.Soft start end SS is through the second capacitor C 2 ground connection.Earth terminal GND ground connection.Compensation node COMP is through the 3rd capacitor C 3 and the 7th resistance R 7 ground connection, and compensation node COMP is through the 4th capacitor C 4 ground connection.Leading end BOOT is connected with switching node SW through the 5th capacitor C 5, and leading end BOOT is through the 5th capacitor C 5, inductance L, the 8th resistance R 8, the 9th resistance R 9 ground connection.Node between the 8th resistance R 8 and the 9th resistance R 9 is connected to feedback input end FB.Node between inductance L and the 8th resistance R 8 is through the 6th capacitor C 6 ground connection.The 7th capacitor C 7 is in parallel with the 6th capacitor C 6.The power input VIN of Voltage stabilizing module 1 receives external power source VCC, and external power source VCC is carried out to voltage stabilizing processing, the voltage of the node stable output between inductance L and the 6th capacitor C 6.
Comparison module 2, the burning voltage of reference voltage input terminal reception Voltage stabilizing module 1 output of comparison module 2 conduct are with reference to voltage, and external power source input receives the voltage that external power source VCC exports.The voltage of reference voltage and external power source input compares, comparison module 2 according to the result of two voltage differential comparisons in its output outputs level signals.It should be noted that comparison module 2 has following two schemes: the one, when the voltage of external power source input is greater than reference voltage, output output high level; Otherwise output low level.The 2nd, when the voltage of external power source input is greater than reference voltage, output output low level; Otherwise, output high level.Specifically can select according to actual conditions.
Protection module 3, receives the level signal of comparison module 2 outputs, and is connected with being switched on or switched off of external power source VCC according to the level signal control master controller receiving.When the voltage of external power source input is greater than reference voltage (when overvoltage appears in external power source VCC), if during comparison module 2 output high level, 3 of protection modules, according to high level signal, are controlled master controller and external power source VCC and are disconnected.When the voltage of external power source input is greater than reference voltage, if during comparison module 2 output low level, 3 of protection modules, according to low level signal, are controlled master controller and external power source VCC and are disconnected.
The utility model is by arranging Voltage stabilizing module 1, comparison module 2 and protection module 3; the burning voltage that Voltage stabilizing module 1 is exported is the reference voltage of module 2 as a comparison; comparison module 2 carries out differential comparison by external power source VCC and reference voltage, detects in real time the voltage status of external power source VCC.When there is overvoltage in external power source VCC; comparison module 2 is by outputs level signals; protection module 3, according to the level signal cut-out master controller of comparison module 2 outputs and being connected of external power source VCC, damages thereby avoided master controller to be subject to overvoltage, has improved the reliability of whole Circuits System.
Particularly, described comparison module 2 comprises the first dividing potential drop submodule 21, the second dividing potential drop submodule 22, feedback resistance Rfb and operational amplifier OP, the input of the first dividing potential drop submodule 21 is connected with the output of Voltage stabilizing module 1, and the output of the first dividing potential drop submodule 21 is connected with the first input end of operational amplifier OP.The input of the second dividing potential drop submodule 22 is connected with external power source VCC, the output of the second dividing potential drop submodule 22 is connected with the second input of operational amplifier OP, the output of operational amplifier OP is the output of module 2 as a comparison, and the output of operational amplifier OP is connected with the second input through feedback resistance Rfb.
In the present embodiment, the output of Voltage stabilizing module 1 is through the first dividing potential drop submodule 21 dividing potential drops, then exports the first input end of operational amplifier OP to; External power source VCC is through the second dividing potential drop submodule 22 dividing potential drops, then exports the second input of operational amplifier OP to.The magnitude of voltage of operational amplifier OP differential comparison two inputs.It should be noted that first input end as operational amplifier OP is positive input terminal, the second input while being negative input end, and external power source VCC is while occurring overvoltage, operational amplifier OP is by output low level.Low level signal exports protection module 3 to, and protection module 3 controls master controller according to low level signal and external power source VCC disconnects.When the first input end of operational amplifier OP is negative input end, the second input while being positive input terminal, and while there is overvoltage in external power source VCC, and operational amplifier OP will export high level.High level signal exports protection module 3 to, and protection module 3 controls master controller according to high level signal and external power source VCC disconnects.Concrete connected mode can be selected according to actual conditions.
Based on above-described embodiment, particularly, the first dividing potential drop submodule 21 comprises the first resistance R 1 and the second resistance R 2, one end of the first resistance R 1 is connected with the output of Voltage stabilizing module 1, the other end of the first resistance R 1 is connected with the second resistance R 2, the second resistance R 2 ground connection, the first resistance R 1 is connected with operational amplifier OP first input end with the node between the second resistance R 2.
Based on above-described embodiment, particularly, the second dividing potential drop submodule 22 comprises the 3rd resistance R 3 and the 4th resistance R 4, one end of the 3rd resistance R 3 is connected with external power source VCC, the other end of the 3rd resistance R 3 is connected with the 4th resistance R 4, the 4th resistance R 4 ground connection, the 3rd resistance R 3 is connected with the second input of operational amplifier OP with the node between the 4th resistance R 4.
Further; protection module 3 comprises switch submodule 31 and power supply connexon module 32; the input of switch submodule 31 is connected with the output of comparison module 2; the output of switch submodule 31 is connected with power supply connexon module 32, and controls 32 connecting and disconnecting of power supply connexon module according to the level signal of comparison module 2 outputs.
In the present embodiment, switch submodule 31 is for receiving the level signal of comparison module 2, the break-make of level signal control switch submodule 31 and then control the break-make of power supply connexon module 32, thus control the break-make of master controller and external power source VCC.By following specific embodiment, set forth.
Switch submodule 31 comprises the 5th resistance R 5 and NPN triode Q, the 5th resistance R 5 one end are as the input of switch submodule 31, the other end of the 5th resistance R 5 is connected with the base stage of NPN triode Q, the collector electrode of NPN triode Q is as the output of switch submodule 31, the grounded emitter of NPN triode Q.Power supply connexon module 32 is relay K.In this definition relay K, there is the first control end, the second control end, tip side, the first link and the second link.The first control end is connected with the output of Voltage stabilizing module 1, and the second control end is connected with the collector electrode of NPN triode Q.Tip side is connected with master controller.When relay K obtains electric adhesive, tip side is connected with the first link.When relay K dead electricity, tip side is connected with the second link.
The first embodiment, the first link is free end, the second link is connected with external power source VCC.When there is overvoltage in external power source VCC, the output of comparison module 2 output high level, high level makes the conducting of NPN triode Q collector junction, thereby makes relay K obtain electric adhesive, and tip side is connected with the first link.From the above, the first link is free end, thereby master controller and external power source VCC are disconnected.
The second embodiment, the first link is connected with external power source VCC, and the second link is free end.When there is overvoltage in external power source VCC, the output output low level of comparison module 2, relay K dead electricity, makes tip side be connected with the second link (free end).Thereby master controller and external power source VCC are disconnected.
The utility model also provides a kind of large-screen splicing system, and this large-screen splicing system comprises master controller overvoltage crowbar.The structure of this master controller overvoltage crowbar can be with reference to above-described embodiment; this master controller overvoltage crowbar is by arranging Voltage stabilizing module 1, comparison module 2 and protection module 3; the burning voltage that Voltage stabilizing module 1 is exported is the reference voltage of module 2 as a comparison; comparison module 2 carries out differential comparison by external power source VCC and reference voltage, detects in real time the voltage status of external power source VCC.When overvoltage appears in external power source VCC, comparison module 2 is by outputs level signals, and control protection module 3 cut-out master controllers are connected with external power source VCC's, thereby avoided master controller to be subject to overvoltage, damage, and have improved the reliability of whole Circuits System.
These are only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.

Claims (8)

1. a master controller overvoltage crowbar, for master controller is carried out to overvoltage protection, described master controller is connected with external power source, it is characterized in that, and described overvoltage crowbar comprises:
Voltage stabilizing module, receives the voltage that described external power source is exported, and stable output voltage;
Comparison module, comprise reference voltage input terminal, external power source input and output, described reference voltage input terminal receives the burning voltage of described Voltage stabilizing module output and using this voltage as with reference to voltage, described external power source input receives the voltage of described external power source output, the voltage of the more described reference voltage of described comparison module and external power source input, and according to comparative result the output outputs level signals by described comparison module;
Protection module, receives the level signal that described comparison module is exported, and when the voltage of described external power source input is greater than described reference voltage, described protection module controls described master controller and described external power source disconnects;
The input of described Voltage stabilizing module is connected with described external power source, and output is connected with the reference voltage input terminal of described comparison module; The external power source input of described comparison module is connected with described external power source, and output is connected with described protective circuit.
2. overvoltage crowbar as claimed in claim 1, it is characterized in that, described comparison module comprises the first dividing potential drop submodule, the second dividing potential drop submodule, feedback resistance and operational amplifier, described first input of dividing potential drop submodule and the output of described Voltage stabilizing module are connected, and described first output of dividing potential drop submodule and the first input end of described operational amplifier are connected; The input of described the second dividing potential drop submodule is connected with described external power source, the output of described the second dividing potential drop submodule is connected with the second input of described operational amplifier, the output of described operational amplifier is as the output of described comparison module, and the output of described operational amplifier is connected with described the second input through described feedback resistance.
3. overvoltage crowbar as claimed in claim 2; it is characterized in that; described the first dividing potential drop submodule comprises the first resistance and the second resistance; one end of described the first resistance is connected with the output of described Voltage stabilizing module; the other end of described the first resistance is connected with described the second resistance; described the second grounding through resistance, described the first resistance is connected with described operational amplifier first input end with the node between described the second resistance.
4. overvoltage crowbar as claimed in claim 2; it is characterized in that; described the second dividing potential drop submodule comprises the 3rd resistance and the 4th resistance; one end of described the 3rd resistance is connected with described external power source; the other end of described the 3rd resistance is connected with the 4th resistance; described the 4th grounding through resistance, described the 3rd resistance is connected with the second input of described operational amplifier with the node between described the 4th resistance.
5. overvoltage crowbar as claimed in claim 1; it is characterized in that; described protection module comprises switch submodule and power supply connexon module; the input of described switch submodule is connected with the output of described comparison module; the output of described switch submodule is connected with described power supply connexon module, and controls the connecting and disconnecting of described power supply connexon module according to the level signal of described comparison module output.
6. overvoltage crowbar as claimed in claim 5; it is characterized in that; described switch submodule comprises the 5th resistance and triode; described the 5th resistance one end is as the input of switch submodule; described the 5th other end of resistance and the base stage of described triode are connected; the collector electrode of described triode is as the output of switch submodule, the grounded emitter of described triode.
7. overvoltage crowbar as claimed in claim 5; it is characterized in that; described power supply connexon module comprises the relay being switched on or switched off for controlling described master controller and described external power source; described relay comprises two control ends; wherein; one control end is connected with the output of described Voltage stabilizing module, and another control end is through described switch submodule ground connection, and by controlling, obtaining of described relay is electric or dead electricity is controlled described master controller and described external power source is switched on or switched off.
8. a large-screen splicing system, comprises master controller, it is characterized in that, also comprises the master controller overvoltage crowbar as described in claim 1 to 7 any one.
CN201320628478.XU 2013-10-11 2013-10-11 Main controller overvoltage protection circuit and large-screen splicing system Expired - Fee Related CN203553913U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104270009A (en) * 2014-09-23 2015-01-07 广东美的制冷设备有限公司 Multi-output power circuit and air conditioner
CN106340865A (en) * 2016-09-30 2017-01-18 成都尚智恒达科技有限公司 Router power source protection circuit
CN106441061A (en) * 2016-09-27 2017-02-22 珠海格力节能环保制冷技术研究中心有限公司 Detection circuit, preposed device, and electrical vortex sensor
CN107122034A (en) * 2016-02-25 2017-09-01 中国长城科技集团股份有限公司 The apparatus and method of voltage monitoring
CN108459218A (en) * 2018-02-05 2018-08-28 天地融电子（天津）有限公司 A kind of test circuit
TWI668932B (en) * 2018-02-14 2019-08-11 友達光電股份有限公司 Over current protection system and over current protection method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104270009A (en) * 2014-09-23 2015-01-07 广东美的制冷设备有限公司 Multi-output power circuit and air conditioner
CN107122034A (en) * 2016-02-25 2017-09-01 中国长城科技集团股份有限公司 The apparatus and method of voltage monitoring
CN107122034B (en) * 2016-02-25 2023-10-10 中国长城科技集团股份有限公司 Apparatus and method for voltage monitoring
CN106441061A (en) * 2016-09-27 2017-02-22 珠海格力节能环保制冷技术研究中心有限公司 Detection circuit, preposed device, and electrical vortex sensor
CN106441061B (en) * 2016-09-27 2019-07-09 珠海格力电器股份有限公司 Detector circuit, preamplifier, and eddy current sensor
CN106340865A (en) * 2016-09-30 2017-01-18 成都尚智恒达科技有限公司 Router power source protection circuit
CN108459218A (en) * 2018-02-05 2018-08-28 天地融电子（天津）有限公司 A kind of test circuit
CN108459218B (en) * 2018-02-05 2021-05-14 天地融电子（天津）有限公司 Test circuit
TWI668932B (en) * 2018-02-14 2019-08-11 友達光電股份有限公司 Over current protection system and over current protection method

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Address after: Baolong Baolong Industrial City six road in Longgang District of Shenzhen City, Guangdong Province, No. 1 518116

Patentee after: SHENZHEN SKYWORTH QUNXIN SECURITY TECHNOLOGY Co.,Ltd.

Address before: 518031 Guangdong city in Shenzhen Province, Futian District Huaqiang North Shijiezhichuang building block A 08G

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