CN107947108A - Over-current detection applied to fire alarm control system protects circuit and implementation method - Google Patents
Over-current detection applied to fire alarm control system protects circuit and implementation method Download PDFInfo
- Publication number
- CN107947108A CN107947108A CN201711445515.2A CN201711445515A CN107947108A CN 107947108 A CN107947108 A CN 107947108A CN 201711445515 A CN201711445515 A CN 201711445515A CN 107947108 A CN107947108 A CN 107947108A
- Authority
- CN
- China
- Prior art keywords
- circuit
- chip
- voltage
- pin
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for DC applications
Landscapes
- Fire-Detection Mechanisms (AREA)
Abstract
Description
技术领域technical field
本发明涉及消防技术领域，具体涉及的是一种应用于火灾报警控制系统的过流检测保护电路及实现方法。The invention relates to the technical field of fire protection, in particular to an overcurrent detection and protection circuit applied to a fire alarm control system and an implementation method.
背景技术Background technique
现有的火灾报警控制系统电路在发生过流后的自我保护方式，基本是依靠硬件来实现，例如采用自恢复保险丝结合外围电路布置。现有的这种自我保护方式，主要缺陷在于：The self-protection mode of the existing fire alarm control system circuit after an overcurrent is basically realized by hardware, for example, a self-recovery fuse combined with peripheral circuit layout. Existing this self-protection mode, main defect is:
(1)驱动能力不足。现有的火灾报警控制系统，因其在电路中存在着自恢复保险丝(其具有一定的阻值)，并且无实现电流放大的功能，所以驱动能力不强(约500mA左右)，无法负载较大的设备。(1) Insufficient driving ability. The existing fire alarm control system, because there is a self-recovery fuse (which has a certain resistance value) in the circuit, and has no function of realizing current amplification, so the driving ability is not strong (about 500mA), and it cannot be used for large loads. device of.
(2)检测过流及保护耗费的时间较长。自恢复保险丝的动作原理是一种能量的动态平衡，流过自恢复保险丝的电流因电流热效应的关系会产生一定程度的热量，当自恢复保险丝处于低阻状态时，自恢复保险丝不动作；当流过自恢复保险丝元件的电流增加时，自恢复保险丝会达到较高的温度，此时，自恢复保险丝会处于高阻保护状态，阻抗的增加限制了电流，使得电流在很短时间内急剧下降，从而起到电路设备保护的作用。不难看出，当系统电路发生过流时，自恢复保险丝阻起到断阻电流作用需要耗费一定的时间(约需要1～2秒)，从而，增加了故障切除响应的时间。(2) It takes a long time to detect overcurrent and protect. The action principle of the resettable fuse is a dynamic balance of energy. The current flowing through the resettable fuse will generate a certain degree of heat due to the thermal effect of the current. When the resettable fuse is in a low resistance state, the resettable fuse does not operate; when When the current flowing through the resettable fuse element increases, the resettable fuse will reach a higher temperature. At this time, the resettable fuse will be in a high-impedance protection state. The increase in impedance limits the current, making the current drop sharply in a short time , thus playing the role of circuit equipment protection. It is not difficult to see that when an overcurrent occurs in the system circuit, it takes a certain amount of time (about 1 to 2 seconds) for the self-recovery fuse to block the current, thus increasing the time for fault removal and response.
因此，有必要设计一种软硬件结合的过流检测及保护电路，以便增强火灾报警控制系统驱动能力的同时，缩短过流后的保护响应时间。Therefore, it is necessary to design an overcurrent detection and protection circuit combining software and hardware, so as to enhance the drive capability of the fire alarm control system and shorten the protection response time after overcurrent.
发明内容Contents of the invention
针对上述技术的不足，本发明提供了一种应用于火灾报警控制系统的过流检测保护电路及实现方法，可在增强火灾报警控制系统驱动能力的同时，缩短系统发生过流后的保护响应时间。Aiming at the deficiencies of the above technologies, the present invention provides an overcurrent detection and protection circuit applied to a fire alarm control system and its implementation method, which can shorten the protection response time after an overcurrent occurs in the system while enhancing the drive capability of the fire alarm control system .
为实现上述目的，本发明采用的技术方案如下：To achieve the above object, the technical scheme adopted in the present invention is as follows:
应用于火灾报警控制系统的过流检测保护电路，包括单片机，具有电流输入引脚、电源引脚、模拟电压输出引脚、滤波引脚的电流检测芯片D5，以及比较器D4、第一光耦电路D9、第二光耦电路D10和半桥驱动集成电路；An overcurrent detection and protection circuit applied to a fire alarm control system, including a single-chip microcomputer, a current detection chip D5 with a current input pin, a power supply pin, an analog voltage output pin, and a filter pin, and a comparator D4, a first optocoupler Circuit D9, the second optocoupler circuit D10 and the half-bridge driver integrated circuit;
所述电流检测芯片D5的电流输入引脚接Ucc+；电流检测芯片D5的电源引脚和滤波引脚均接VDD；模拟电压输出引脚接比较器D4的IN-端，并且在模拟电压输出引脚与比较器D4的IN-端之间接有电容C16，该电容C16通过引线接入单片机，由单片机采集该电容C16处的电压信号；The current input pin of the current detection chip D5 is connected to Ucc + ; the power supply pin and the filter pin of the current detection chip D5 are connected to VDD; the analog voltage output pin is connected to the IN - end of the comparator D4, and the analog voltage output A capacitor C16 is connected between the pin and the IN - end of the comparator D4, and the capacitor C16 is connected to the single-chip microcomputer through a lead wire, and the voltage signal at the capacitor C16 is collected by the single-chip computer;
所述比较器D4的IN+端经电阻R15接VDD，同时还经电阻R16接地；比较器D4输出端接入单片机的外部中断；The IN + end of the comparator D4 is connected to VDD through the resistor R15, and is also grounded through the resistor R16; the output end of the comparator D4 is connected to the external interrupt of the single-chip microcomputer;
所述第一光耦电路D9同时接半桥驱动集成电路的脉冲输入端和单片机，并接12V+和VDD；The first optocoupler circuit D9 is simultaneously connected to the pulse input end of the half-bridge drive integrated circuit and the single-chip microcomputer, and connected to 12V + and VDD;
所述第二光耦电路D10接单片机，并通过三极管V11接半桥驱动集成电路的SD信号输入端，并接12V+和VDD；三极管V11发射极接Ucc-；The second optocoupler circuit D10 is connected to the single-chip microcomputer, and connected to the SD signal input end of the half-bridge driving integrated circuit through the triode V11, and connected to 12V + and VDD; the emitter of the triode V11 is connected to Ucc- ;
所述半桥驱动集成电路接电流检测芯片D5的电流输入引脚。The half-bridge driving integrated circuit is connected to the current input pin of the current detection chip D5.
具体地说，所述第一光耦电路D9和第二光耦电路D10均包括一个发光二极管、一个光敏二极管和一个NPN型三极管，发光二极管与光敏二极管互相匹配，并且光敏二极管与NPN型三极管的基极连接，其中，发光二极管正极接VDD，负极接单片机；光敏二极管正极接12V+，负极接NPN型三极管的基极；第一光耦电路D9中的NPN型三极管的集电极接半桥驱动集成电路的激励脉冲输入端，发射极接Ucc-；第二光耦电路D10中的NPN型三极管的集电极接12V+，发射极接三极管V11的基极。Specifically, the first optocoupler circuit D9 and the second optocoupler circuit D10 each include a light-emitting diode, a photosensitive diode and an NPN transistor, the light-emitting diode and the photodiode match each other, and the photosensitive diode and the NPN transistor Base connection, wherein, the anode of the light-emitting diode is connected to VDD, and the cathode is connected to the microcontroller; the anode of the photodiode is connected to 12V + , and the cathode is connected to the base of the NPN transistor; the collector of the NPN transistor in the first optocoupler circuit D9 is connected to the half-bridge drive The excitation pulse input end of the integrated circuit, the emitter is connected to Ucc - ; the collector of the NPN transistor in the second optocoupler circuit D10 is connected to 12V + , and the emitter is connected to the base of the transistor V11.
进一步地，所述半桥驱动集成电路包括驱动芯片D8、二极管V5、电容C22、高压mos管V6、高压mos管V9；所述第一光耦电路D9中的NPN型三极管的集电极接驱动芯片D8的激励脉冲输入端，所述驱动芯片D8的SD信号输入端同时接三极管V11的集电极和12V+，高端输出端接高压mos管V6的栅极，低端输出端接高压mos管V9的栅极，反馈输入端同时接高压mos管V6的源极、高压mos管V9的漏极，公共接地端接Ucc-，VCC端口则接12V+，并经由电容C21接Ucc-；所述的二极管V5正极接电容C21，负极接驱动芯片D8的自举电压输入端，并且该二极管V5负极还经电容C22接驱动芯片D8的反馈输入端；所述高压mos管V6的漏极接电流检测芯片D5的电流输入引脚；所述高压mos管V9的源极接Ucc-。Further, the half-bridge driving integrated circuit includes a driving chip D8, a diode V5, a capacitor C22, a high-voltage mos tube V6, and a high-voltage mos tube V9; the collector of the NPN transistor in the first optocoupler circuit D9 is connected to the driving chip The excitation pulse input terminal of D8, the SD signal input terminal of the driver chip D8 is connected to the collector of the triode V11 and 12V + at the same time, the high-end output terminal is connected to the gate of the high-voltage mos tube V6, and the low-end output terminal is connected to the high-voltage mos tube V9. The gate and the feedback input terminal are simultaneously connected to the source of the high-voltage mos tube V6 and the drain of the high-voltage mos tube V9, the common ground terminal is connected to Ucc - , the VCC port is connected to 12V + , and connected to Ucc - through the capacitor C21; the diode The positive pole of V5 is connected to the capacitor C21, the negative pole is connected to the bootstrap voltage input terminal of the driver chip D8, and the negative pole of the diode V5 is also connected to the feedback input terminal of the driver chip D8 through the capacitor C22; the drain of the high-voltage mos tube V6 is connected to the current detection chip D5 The current input pin; the source of the high-voltage mos tube V9 is connected to Ucc - .
基于上述电路，本发明还提供了其实现方法，包括以下步骤：Based on the above circuit, the present invention also provides its realization method, comprising the following steps:
(1)单片机输出高电平并接通第一光耦电路D9，驱动芯片D8的高端输出端置高电平，驱动高压mos管V6导通；(1) The single-chip microcomputer outputs a high level and connects the first optocoupler circuit D9, the high-end output terminal of the driver chip D8 is set to a high level, and drives the high-voltage mos tube V6 to conduct;
(2)电流检测芯片D5采集电流信号；(2) The current detection chip D5 collects the current signal;
(3)比较器D4比较IN+端与IN-端的电压值，当IN+端的电压值小于IN-端的电压值时，比较器D4输出电平翻转；(3) The comparator D4 compares the voltage values of the IN + terminal and the IN - terminal, and when the voltage value of the IN + terminal is less than the voltage value of the IN - terminal, the output level of the comparator D4 is reversed;
(4)单片机根据比较器D4的IN-端的电压信号，判定此时系统故障的类型，并接通第二光耦电路D10；(4) single-chip microcomputer judges the type of system failure at this moment according to the voltage signal of the IN - end of comparator D4, and connects the second optocoupler circuit D10;
(5)第二光耦电路D10触发三极管V11的集电极与发射极导通，驱动芯片D8的高端输出端置低电平，高压mos管V6截止，实现过流保护。(5) The second optocoupler circuit D10 triggers the collector and emitter of the triode V11 to conduct, the high-end output terminal of the driver chip D8 is set to low level, and the high-voltage mos tube V6 is cut off to realize over-current protection.
与现有技术相比，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
(1)本发明通过设计电流检测芯片、比较器、第一光耦电路、第二光耦电路和半桥驱动集成电路，比较器输出电平的性质取决于电流检测芯片流经的电流值大小，通过单片机控制第一光耦电路、第二光耦电路的导通与断开状态，从而，驱动控制半桥驱动集成电路的高压mos管导通或断开，当系统发生过载或短路故障时，保护的响应时间极短(约10us)，很好地保护了设备，消除了安全隐患。如此一来，本发明通过软硬件的有效结合，不仅确保了火灾报警控制系统的正常工作，而且，利用高压mos管输入电流极小、温度稳定性能良好、抗辐射能力强、放大能力强等优点，驱动芯片只需输出较小的信号便能驱动高压mos管，实现信号的放大，从而大幅提高了整个系统的驱动能力(可达到10A左右)，可谓一举两得。(1) The present invention is by designing current detection chip, comparator, the first optocoupler circuit, the second optocoupler circuit and half-bridge drive integrated circuit, the character of comparator output level depends on the current value size that current detection chip flows through , control the on and off state of the first optocoupler circuit and the second optocoupler circuit through the single-chip microcomputer, thereby driving and controlling the high-voltage mos tube of the half-bridge drive integrated circuit to turn on or off, when the system is overloaded or short-circuited , The response time of the protection is extremely short (about 10us), which protects the equipment well and eliminates potential safety hazards. In this way, the present invention not only ensures the normal operation of the fire alarm control system through the effective combination of software and hardware, but also utilizes the advantages of extremely small input current of the high-voltage mos tube, good temperature stability, strong anti-radiation ability, and strong amplification ability. , the driver chip only needs to output a small signal to drive the high-voltage mos tube to achieve signal amplification, thereby greatly improving the driving capability of the entire system (up to about 10A), which can be said to kill two birds with one stone.
(2)本发明根据系统故障时电流电压变化情况巧妙地设置电流检测芯片，实时采集系统运行电流，并利用比较器进行电流变化判定。通过在比较器D4的IN-端并接电容C16进行充放电，一方面，作为比较器的输入电压，为高压mos管准确响应提供了保障，避免发生故障(例如过载或短路)时，比较器D4向单片机输出高电平信号，导致半桥驱动集成电路与电流检测芯片导通；另一方面，在保证保护响应时间的同时，也能防止系统电流波动造成的高压mos管误动作，使保护动作更准确。(2) The present invention skillfully arranges the current detection chip according to the current and voltage changes when the system fails, collects the operating current of the system in real time, and uses the comparator to judge the current change. By connecting the capacitor C16 to the IN - terminal of the comparator D4 for charging and discharging, on the one hand, as the input voltage of the comparator, it provides a guarantee for the accurate response of the high-voltage mos tube, and prevents the comparator from D4 outputs a high-level signal to the microcontroller, causing the half-bridge drive integrated circuit and the current detection chip to be turned on; on the other hand, while ensuring the protection response time, it can also prevent the high-voltage mos tube from malfunctioning caused by system current fluctuations, so that Actions are more accurate.
(3)本发明的比较器与单片机外部中断连接，仅系统发生故障时，单片机才执行中断程序，用于判断此时故障的类型，为后期维护处理提供依据。本发明通过软硬件的结合，驱动控制第一光耦电路、第二光耦电路导通或截止，实现系统快速自我保护响应。(3) The comparator of the present invention is connected with the external interrupt of the single-chip microcomputer, and only when the system breaks down, the single-chip microcomputer just executes the interrupt program, which is used to judge the type of the failure at this time, and provides a basis for the later maintenance process. The invention drives and controls the first optocoupler circuit and the second optocoupler circuit to be turned on or off through the combination of software and hardware, so as to realize the fast self-protection response of the system.
(4)本发明各个环节环环相扣、相辅相成，其通过整体的电路结构设计，结合软件的逻辑判断，巧妙地实现了“大电流-小电压”(即：未过流时输出大电流，发生过载或短路时自我保护)，从而更好地满足了火灾报警控制系统的实际工作需要。(4) The various links of the present invention are interlocking and complement each other. Through the design of the overall circuit structure and the logical judgment of the software, it skillfully realizes "large current-small voltage" (that is, outputting a large current when there is no overcurrent, Self-protection in the event of overload or short circuit), thus better meeting the actual work needs of the fire alarm control system.
附图说明Description of drawings
图1为本发明的电路原理图。Fig. 1 is the circuit schematic diagram of the present invention.
具体实施方式Detailed ways
下面结合附图说明和实施例对本发明作进一步说明，本发明的方式包括但不仅限于以下实施例。The present invention will be further described below with reference to the accompanying drawings and embodiments, and the mode of the present invention includes but not limited to the following embodiments.
实施例Example
如图1所示，本发明提供了一种过流检测保护电路，可应用于火灾报警控制系统中，其主要由单片机、电流检测芯片D5、比较器D4、第一光耦电路D9、第二光耦电路D10和半桥驱动集成电路组成。As shown in Figure 1, the present invention provides an overcurrent detection and protection circuit, which can be applied to a fire alarm control system, which mainly consists of a single chip microcomputer, a current detection chip D5, a comparator D4, a first optocoupler circuit D9, a second The optocoupler circuit D10 is composed of a half-bridge driving integrated circuit.
所述的电流检测芯片D5具有电流输入引脚(IP+和IP-)、电源引脚(VCC)、模拟电压输出引脚(VIOUT)、滤波引脚(FILTER)，其中，电流输入引脚(IP+)接Ucc+；电流检测芯片D5的电源引脚和滤波引脚均接VDD；模拟电压输出引脚接比较器D4的IN-端，并且在模拟电压输出引脚与比较器D4的IN-端之间接有电容C16，该电容C16通过引线接入单片机。Described current detecting chip D5 has current input pin (IP+ and IP-), power supply pin (VCC), analog voltage output pin (VIOUT), filtering pin (FILTER), wherein, current input pin (IP+ ) is connected to Ucc + ; the power supply pin and the filter pin of the current detection chip D5 are connected to VDD; the analog voltage output pin is connected to the IN - end of the comparator D4, and the analog voltage output pin is connected to the IN - end of the comparator D4 A capacitor C16 is connected between them, and the capacitor C16 is connected to the single-chip microcomputer through a lead wire.
所述比较器D4的IN+端经电阻R15接VDD，同时还经电阻R16接地；比较器D4输出端则接入单片机的外部中断。The IN + terminal of the comparator D4 is connected to VDD via the resistor R15, and is also grounded via the resistor R16; the output terminal of the comparator D4 is connected to the external interrupt of the single-chip microcomputer.
所述的第一光耦电路D9和第二光耦电路D10用于控制半桥驱动集成电路与电流检测芯片D5的连通或断开。The first optocoupler circuit D9 and the second optocoupler circuit D10 are used to control the connection or disconnection of the half-bridge driving integrated circuit and the current detection chip D5.
具体地说，所述的第一光耦电路D9和第二光耦电路D10均包括一个发光二极管、一个光敏二极管和一个NPN型三极管，其中，发光二极管正极接VDD，负极接单片机；光敏二极管正极接12V+，负极接NPN型三极管的基极；第一光耦电路D9中的发射极接Ucc-；第二光耦电路D10中的NPN型三极管的集电极接12V+，发射极接三极管V11的基极。Specifically, the first optocoupler circuit D9 and the second optocoupler circuit D10 both include a light-emitting diode, a photosensitive diode and an NPN transistor, wherein the positive pole of the light-emitting diode is connected to VDD, and the negative pole is connected to the single-chip microcomputer; the positive pole of the photosensitive diode is Connect to 12V + , the negative pole to the base of the NPN transistor; the emitter in the first optocoupler circuit D9 to Ucc - ; the collector of the NPN transistor in the second optocoupler circuit D10 to 12V + , and the emitter to the transistor V11 base.
所述的半桥驱动集成电路则包括驱动芯片D8、二极管V5、电容C22、高压mos管V6、V9。所述的第一光耦电路D9中的NPN型三极管的集电极接驱动芯片D8的激励脉冲输入端(IN)，驱动芯片D8的SD信号输入端同时接三极管V11的集电极和12V+，高端输出端(HO)接高压mos管V6的栅极(两者串联有一个驱动电阻R26)，低端输出端(LO)接高压mos管V9的栅极(两者串联有一个驱动电阻R31)，反馈输入端(VS)同时接高压mos管V6的源极、高压mos管V9的漏极，公共接地端(COM)接Ucc-，VCC端口则接12V+，并经由电容C21接Ucc-。所述的二极管V5正极接电容C21，负极接驱动芯片D8的自举电压输入端(VB)，并且该二极管V5负极还经电容C22接驱动芯片D8的反馈输入端；所述高压mos管V6的漏极接电流检测芯片D5的电流输入引脚(IP-)；所述高压mos管V9的源极接Ucc-。其中，Ucc-和Ucc+为火灾报警控制系电源，VDD为保护电路内部供电电源。The half-bridge driving integrated circuit includes a driving chip D8, a diode V5, a capacitor C22, and high-voltage mos tubes V6 and V9. The collector of the NPN type transistor in the first optocoupler circuit D9 is connected to the excitation pulse input terminal (IN) of the driver chip D8, and the SD signal input terminal of the driver chip D8 Connect the collector of the triode V11 and 12V + at the same time, the high-end output terminal (HO) is connected to the gate of the high-voltage mos tube V6 (the two are connected in series with a driving resistor R26), and the low-end output terminal (LO) is connected to the gate of the high-voltage mos tube V9 pole (there is a driving resistor R31 in series), the feedback input terminal (VS) is connected to the source of the high-voltage mos tube V6 and the drain of the high-voltage mos tube V9 at the same time, the common ground terminal (COM) is connected to Ucc - , and the VCC port is connected to 12V + , and connected to Ucc - via capacitor C21. The positive pole of the diode V5 is connected to the capacitor C21, the negative pole is connected to the bootstrap voltage input terminal (VB) of the driver chip D8, and the negative pole of the diode V5 is also connected to the feedback input terminal of the driver chip D8 through the capacitor C22; The drain is connected to the current input pin (IP-) of the current detection chip D5; the source of the high-voltage mos tube V9 is connected to Ucc − . Among them, Ucc - and Ucc + are the power supply of the fire alarm control system, and VDD is the internal power supply of the protection circuit.
本发明可实现系统电流增大及过流后的自我保护，其具体实现过程如下：The present invention can realize system current increase and self-protection after overcurrent, and its specific realization process is as follows:
初始时，单片机输出高电平信号驱动第一光耦电路D9，第一光耦电路D9内的三极管的发射极与集电极导通，从而驱动高压mos管V6导通，使得火灾报警控制系统的电源回路接通，并且系统驱动能力可达到10A左右，与此同时，单片机采集电容C16处的电压信号。Initially, the microcontroller outputs a high-level signal to drive the first optocoupler circuit D9, and the emitter and collector of the triode in the first optocoupler circuit D9 are turned on, thereby driving the high-voltage mos tube V6 to turn on, making the fire alarm control system The power supply circuit is connected, and the system drive capacity can reach about 10A. At the same time, the single-chip microcomputer collects the voltage signal at the capacitor C16.
电流检测芯片D5采集电流信号，并将该电流信号传输至电容C16处，由比较器D4进行IN+端电压与IN-端电压对比，比较器D4的IN-端电压值大小由流过电流检测芯片D5的电流值决定。如果IN+端电压大于IN-端电压，则说明此时系统为正常运行状态，比较器输出高电平。The current detection chip D5 collects the current signal, and transmits the current signal to the capacitor C16, and the comparator D4 compares the voltage of the IN + terminal with the voltage of the IN - terminal, and the voltage value of the IN - terminal of the comparator D4 is detected by the flowing current The current value of chip D5 is determined. If the voltage at the IN + terminal is greater than the voltage at the IN - terminal, it means that the system is in a normal operating state at this time, and the comparator outputs a high level.
如果IN+端电压小于IN-端电压，则比较器D4输出电平翻转并作为单片机的外部中断信号，单片机接收外部中断信号后采集电容C16处的电压信号，然后将该电压信号进行AD转换，判定此时系统故障的类型。若AD转换的电压值大于预设值，则该系统故障为过载；若AD转换的电压值小于预设值，则该系统故障为短路。If the voltage at the IN + terminal is less than the voltage at the IN - terminal, the output level of the comparator D4 is reversed and used as an external interrupt signal of the single-chip microcomputer. After the single-chip microcomputer receives the external interrupt signal, it collects the voltage signal at the capacitor C16, and then performs AD conversion on the voltage signal. Determine the type of system failure at this time. If the voltage value of the AD conversion is greater than the preset value, the system failure is overload; if the voltage value of the AD conversion is lower than the preset value, the system failure is a short circuit.
确认系统故障的同时，单片机驱动第二光耦电路D10工作，触发三极管V11的集电极与发射极导通，此时，高压mos管V6截止，从而断开火灾报警控制系统的电源回路。While confirming the system failure, the microcontroller drives the second optocoupler circuit D10 to work, and triggers the collector and emitter of the triode V11 to conduct. At this time, the high-voltage mos tube V6 is cut off, thereby disconnecting the power circuit of the fire alarm control system.
本发明通过合理的电路结构及流程设计，很好地实现了系统驱动能力增强及发生过流后的自我保护。相比现有技术来说，本发明有效地实现了对系统过载或短路检测以及“大电流-小电压”的目的，更好地满足了火灾报警控制系统的实际工作需要。因此，本发明适于在火灾消防技术领域中大规模推广应用。Through reasonable circuit structure and process design, the present invention well realizes the enhancement of system drive capability and self-protection after overcurrent occurs. Compared with the prior art, the present invention effectively realizes the purpose of system overload or short circuit detection and "high current-low voltage", and better meets the actual working needs of the fire alarm control system. Therefore, the present invention is suitable for large-scale popularization and application in the technical field of fire fighting.
上述实施例仅为本发明的优选实施方式之一，不应当用于限制本发明的保护范围，但凡在本发明的主体设计思想和精神上作出的毫无实质意义的改动或润色，其所解决的技术问题仍然与本发明一致的，均应当包含在本发明的保护范围之内。The above-mentioned embodiment is only one of the preferred implementation modes of the present invention, and should not be used to limit the scope of protection of the present invention, but any modification or embellishment without substantive significance made on the main design concept and spirit of the present invention shall be solved by it. If the technical problems are still consistent with the present invention, all should be included in the protection scope of the present invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711445515.2A CN107947108A (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711445515.2A CN107947108A (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107947108A true CN107947108A (en) | 2018-04-20 |
Family
ID=61939417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711445515.2A Pending CN107947108A (en) | 2017-12-27 | 2017-12-27 | Over-current detection applied to fire alarm control system protects circuit and implementation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107947108A (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565070A (en) * | 2001-10-05 | 2005-01-12 | 美蓓亚株式会社 | Motor control circuit overcurrent protection |
| CN101060291A (en) * | 2007-05-25 | 2007-10-24 | 哈尔滨工业大学 | Transformer-free ultrasonic motor driver |
| CN101128079A (en) * | 2006-08-16 | 2008-02-20 | 联昌电子企业股份有限公司 | Lamp tube driving system using electric isolation control |
| CN201393196Y (en) * | 2009-04-03 | 2010-01-27 | 华南理工大学 | A drive module to realize the control of industrial DC motor by remote control of aircraft model |
| CN102263536A (en) * | 2011-07-25 | 2011-11-30 | 李军科 | Stepping motor subdivided driving device for current vector constant amplitude control |
| CN202331701U (en) * | 2011-11-21 | 2012-07-11 | 蚌埠依爱消防电子有限责任公司 | Universal relay module of automatic fire alarm system |
| CN102946191A (en) * | 2012-11-15 | 2013-02-27 | 无锡商业职业技术学院 | Digital boost switching mode power supply device based on DSP (digital signal processor) |
| CN202886478U (en) * | 2012-11-21 | 2013-04-17 | 保定金迪科学仪器有限公司 | Large-current and direct-current resistor tester |
| CN104868731A (en) * | 2014-02-21 | 2015-08-26 | 东莞钜威新能源有限公司 | Bidirectional isolation DC-DC converter |
| CN204855662U (en) * | 2015-06-23 | 2015-12-09 | 国网青海省电力公司 | Passive dc -to -ac converter experimental apparatus of single -phase photovoltaic |
| CN205319987U (en) * | 2015-12-24 | 2016-06-15 | 上海力申科学仪器有限公司 | Electronic operating table oil pump timing control drive circuit |
| CN105720641A (en) * | 2016-03-30 | 2016-06-29 | 四川中科智慧智能系统有限公司 | Subsection track charging system and control method therefor |
| CN106877756A (en) * | 2017-03-21 | 2017-06-20 | 新疆大学 | Group control motor driven electric door system based on CAN bus |
| CN106981986A (en) * | 2017-04-13 | 2017-07-25 | 佛山科学技术学院 | Charging device based on the two-way DC DC converters of non-isolation type |
| CN107072020A (en) * | 2017-02-06 | 2017-08-18 | 珠海美光原科技股份有限公司 | A kind of single-stage HID digital ballast circuits based on piezoelectric transformer |
| CN107336775A (en) * | 2017-07-24 | 2017-11-10 | 西安科技大学 | A kind of double single wheel Self-balance electric vehicles and its control method for coordinating |
| CN207664592U (en) * | 2017-12-27 | 2018-07-27 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit |
| CN208353215U (en) * | 2018-04-28 | 2019-01-08 | 浙江师范大学 | SCM Based digitlization circuit of power factor correction |
-
2017
- 2017-12-27 CN CN201711445515.2A patent/CN107947108A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565070A (en) * | 2001-10-05 | 2005-01-12 | 美蓓亚株式会社 | Motor control circuit overcurrent protection |
| CN101128079A (en) * | 2006-08-16 | 2008-02-20 | 联昌电子企业股份有限公司 | Lamp tube driving system using electric isolation control |
| CN101060291A (en) * | 2007-05-25 | 2007-10-24 | 哈尔滨工业大学 | Transformer-free ultrasonic motor driver |
| CN201393196Y (en) * | 2009-04-03 | 2010-01-27 | 华南理工大学 | A drive module to realize the control of industrial DC motor by remote control of aircraft model |
| CN102263536A (en) * | 2011-07-25 | 2011-11-30 | 李军科 | Stepping motor subdivided driving device for current vector constant amplitude control |
| CN202331701U (en) * | 2011-11-21 | 2012-07-11 | 蚌埠依爱消防电子有限责任公司 | Universal relay module of automatic fire alarm system |
| CN102946191A (en) * | 2012-11-15 | 2013-02-27 | 无锡商业职业技术学院 | Digital boost switching mode power supply device based on DSP (digital signal processor) |
| CN202886478U (en) * | 2012-11-21 | 2013-04-17 | 保定金迪科学仪器有限公司 | Large-current and direct-current resistor tester |
| CN104868731A (en) * | 2014-02-21 | 2015-08-26 | 东莞钜威新能源有限公司 | Bidirectional isolation DC-DC converter |
| CN204855662U (en) * | 2015-06-23 | 2015-12-09 | 国网青海省电力公司 | Passive dc -to -ac converter experimental apparatus of single -phase photovoltaic |
| CN205319987U (en) * | 2015-12-24 | 2016-06-15 | 上海力申科学仪器有限公司 | Electronic operating table oil pump timing control drive circuit |
| CN105720641A (en) * | 2016-03-30 | 2016-06-29 | 四川中科智慧智能系统有限公司 | Subsection track charging system and control method therefor |
| CN107072020A (en) * | 2017-02-06 | 2017-08-18 | 珠海美光原科技股份有限公司 | A kind of single-stage HID digital ballast circuits based on piezoelectric transformer |
| CN106877756A (en) * | 2017-03-21 | 2017-06-20 | 新疆大学 | Group control motor driven electric door system based on CAN bus |
| CN106981986A (en) * | 2017-04-13 | 2017-07-25 | 佛山科学技术学院 | Charging device based on the two-way DC DC converters of non-isolation type |
| CN107336775A (en) * | 2017-07-24 | 2017-11-10 | 西安科技大学 | A kind of double single wheel Self-balance electric vehicles and its control method for coordinating |
| CN207664592U (en) * | 2017-12-27 | 2018-07-27 | 四川赛科安全技术有限公司 | Over-current detection applied to fire alarm control system protects circuit |
| CN208353215U (en) * | 2018-04-28 | 2019-01-08 | 浙江师范大学 | SCM Based digitlization circuit of power factor correction |
Non-Patent Citations (1)
| Title |
|---|
| 何明霞: "基于PCI18F4523的电磁激振器驱动系统设计", 嵌入式系统, vol. 31, no. 4, pages 1 - 3 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202676816U (en) | Photoelectric coupling device, photoelectric isolation detection circuit and notification circuit | |
| CN106569015B (en) | AC load detection circuit | |
| CN106505513B (en) | A kind of LED drive power and its output end short-circuit protection circuit | |
| CN207664592U (en) | Over-current detection applied to fire alarm control system protects circuit | |
| CN208508514U (en) | A kind of short-circuit protection circuit of switching circuit | |
| CN106924925B (en) | A kind of active output driving circuit and its implementation of input/output module | |
| CN209218057U (en) | A kind of field-effect tube driving circuit | |
| CN104897955A (en) | Intelligent current voltmeter | |
| CN104331111B (en) | A kind of active, passive intake adaptive circuit for relay-protection tester | |
| CN103381757A (en) | Fault latch circuit of electric vehicle controller | |
| CN107947108A (en) | Over-current detection applied to fire alarm control system protects circuit and implementation method | |
| CN105116200B (en) | A kind of detection circuit of compatible switch amount and level amount | |
| CN201604575U (en) | A Flasher Circuit with Current-Limiting and Voltage-Limiting Function | |
| CN104426120A (en) | Overcurrent and overvoltage protection circuit and lamp | |
| CN206340954U (en) | A kind of LED drive power and its output end short-circuit protection circuit | |
| CN207764338U (en) | A kind of fuse detection circuit | |
| CN106246586A (en) | A kind of DC fan failure detector circuit | |
| CN208367166U (en) | A kind of LM317 failure of chip detection circuit based on single-chip microcontroller control and calculus of differences circuit sampling | |
| CN105811357B (en) | Current foldback circuit and the AI modules that the current foldback circuit is set | |
| CN105337484B (en) | A kind of upper and lower bridge arm of H bridge inverters leads directly to protection circuit | |
| CN209151406U (en) | The protection circuit of low ripple LED control device | |
| CN209592617U (en) | A kind of level meter mode of laser group driving circuit | |
| CN102664125B (en) | Double high driving level-resistant magnetic latching relay driving circuit | |
| CN102843531A (en) | Drive control circuit and television | |
| CN201332464Y (en) | Switch power supply circuit and television |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180420 |
|
| RJ01 | Rejection of invention patent application after publication |