CN207234751U - A kind of trigger circuit for breaker - Google Patents
A kind of trigger circuit for breaker Download PDFInfo
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- CN207234751U CN207234751U CN201720913803.5U CN201720913803U CN207234751U CN 207234751 U CN207234751 U CN 207234751U CN 201720913803 U CN201720913803 U CN 201720913803U CN 207234751 U CN207234751 U CN 207234751U
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Abstract
本实用新型公开了一种用于断路器的触发电路,包括加速电容回路、光耦隔离芯片和触发回路,其中,触发电压信号通过加速电容回路触发光耦隔离芯片,光耦隔离芯片通过触发回路发出触发信号。本实用新型不仅有效的减少了触发延时,使触发反应时间缩短到大约100nS,而且能够接受的触发电压范围更宽,本实用新型中的触发电压能够达到DC30V~DC300V。
The utility model discloses a trigger circuit for a circuit breaker, which comprises an accelerating capacitor circuit, an optocoupler isolation chip and a trigger circuit, wherein the trigger voltage signal triggers the optocoupler isolation chip through the acceleration capacitor circuit, and the optocoupler isolation chip passes through the trigger circuit Send a trigger signal. The utility model not only effectively reduces the trigger delay, shortens the trigger reaction time to about 100nS, but also has a wider range of acceptable trigger voltages, and the trigger voltage in the utility model can reach DC30V-DC300V.
Description
技术领域technical field
本实用新型涉及一种触发电路,特别涉及一种用于断路器的触发电路。The utility model relates to a trigger circuit, in particular to a trigger circuit for a circuit breaker.
背景技术Background technique
断路器操动机构动作电压测试技术是电力系统安全运行的重要保障之一,其动作电压的触发电路设计至关重要,目前国内外,常用的触发回路都是不包括加速电容的电路。The operating voltage test technology of the circuit breaker operating mechanism is one of the important guarantees for the safe operation of the power system. The trigger circuit design of the operating voltage is very important. At present, the commonly used trigger circuits at home and abroad are circuits that do not include accelerating capacitors.
现有技术中的触发电路结构图,如图1所示,包括光耦隔离芯片1和触发回路2,触发电压信号经过电阻R1,然后进入光耦隔离芯片的第二引脚,并从光耦隔离芯片的第三引脚形成回路。正常情况下光耦隔离芯片的第六引脚因为上拉电阻R2而输出高电平,当有触发电压信号时,该引脚变为低电平,此信号为触发信号。The trigger circuit structure diagram in the prior art, as shown in Figure 1, includes an optocoupler isolation chip 1 and a trigger circuit 2, the trigger voltage signal passes through the resistor R1 , then enters the second pin of the optocoupler isolation chip, and is transmitted from the optocoupler The third pin of the coupled isolation chip forms a loop. Under normal circumstances, the sixth pin of the optocoupler isolation chip outputs a high level because of the pull-up resistor R2 . When there is a trigger voltage signal, this pin becomes a low level, and this signal is a trigger signal.
此触发电路的缺点在于,由于PCB封装尺寸的限制,现电阻R1的功率选择2W,为了使触发电路在DC300V触发电压下正常工作,电阻R1的阻值必须大于R=U2/P=3002/2=45KΩ,常见光耦隔离芯片典型导通电流为2mA~15mA,为了使光耦隔离芯片正常工作,所以最低电流为2mA,所以使得最小触发电压只有U=IR=90V。The disadvantage of this trigger circuit is that due to the limitation of the PCB package size, the current power of resistor R1 is 2W. In order to make the trigger circuit work normally under the trigger voltage of DC300V, the resistance value of resistor R1 must be greater than R=U 2 /P= 300 2 /2=45KΩ, the typical conduction current of the common optocoupler isolation chip is 2mA~15mA, in order to make the optocoupler isolation chip work normally, the minimum current is 2mA, so the minimum trigger voltage is only U=IR=90V.
综上所述市面上普遍触发电路的触发电压范围窄,已不满足某些动作电压低的断路器低电压动作测试的要求。In summary, the trigger voltage range of common trigger circuits on the market is narrow, which no longer meets the requirements of low-voltage actuation tests for circuit breakers with low actuation voltages.
实用新型内容Utility model content
实用新型目的:本实用新型针对现有技术存在的问题,提供了一种反应速度快,触发电压范围宽的用于断路器的触发电路。Purpose of the utility model: The utility model aims at the problems existing in the prior art, and provides a trigger circuit for a circuit breaker with a fast response speed and a wide trigger voltage range.
技术方案:本实用新型提供了一种用于断路器的触发电路,包括加速电容回路、光耦隔离芯片和触发回路,其中,触发电压信号通过加速电容回路触发光耦隔离芯片,光耦隔离芯片通过触发回路发出触发信号;所述加速电容回路包括第三电阻R3、第四电阻R4、第一电容C1和二极管D1,其中,第三电阻R3的一端分别与触发电压和第四电阻R4的一端连接,第三电阻R3的另一端与第一电容C1的一端连接,第一电容C1的另一端分别与第四电阻R4、二极管D1的负极和光耦隔离芯片的第二引脚连接,二极管D1的正极分别与光耦隔离芯片的第三引脚、触发电压和地连接。Technical solution: The utility model provides a trigger circuit for a circuit breaker, including an accelerating capacitor circuit, an optocoupler isolation chip and a trigger circuit, wherein the trigger voltage signal triggers the optocoupler isolation chip through the acceleration capacitor circuit, and the optocoupler isolation chip The trigger signal is sent through the trigger loop; the accelerating capacitor loop includes a third resistor R 3 , a fourth resistor R 4 , a first capacitor C 1 and a diode D 1 , wherein one end of the third resistor R 3 is connected to the trigger voltage and the first capacitor respectively. One end of the four resistors R4 is connected, the other end of the third resistor R3 is connected to one end of the first capacitor C1 , and the other end of the first capacitor C1 is respectively isolated from the fourth resistor R4 , the cathode of the diode D1 and the optocoupler The second pin of the chip is connected, and the anode of the diode D1 is respectively connected to the third pin of the optocoupler isolation chip, the trigger voltage and the ground.
进一步,所述第三电阻R3为5.1KΩ,第四电阻R4为27KΩ,第二电阻R2为1KΩ。这样能够有效的保护光耦隔离芯片,同时使触发电压能够达到DC30V~DC300V,保证触发电路的正常工作。Further, the third resistor R3 is 5.1KΩ, the fourth resistor R4 is 27KΩ, and the second resistor R2 is 1KΩ. In this way, the optocoupler isolation chip can be effectively protected, and the trigger voltage can reach DC30V-DC300V at the same time, so as to ensure the normal operation of the trigger circuit.
进一步,第一电容C1的容值为0.1uF。在保证能够正常产生触发信号的同时有效减小了整个触发电路的体积。Further, the capacitance of the first capacitor C1 is 0.1uF. While ensuring that the trigger signal can be normally generated, the volume of the entire trigger circuit is effectively reduced.
进一步,所述二极管D1的型号为1N4148。二极管D1为反向保护二极管,采用这个型号的二极管,当触发电压接反时,能够更好的保护光耦隔离芯片不被损坏。Further, the model of the diode D 1 is 1N4148. Diode D1 is a reverse protection diode. Using this type of diode can better protect the optocoupler isolation chip from being damaged when the trigger voltage is reversed.
进一步,所述光耦隔离芯片的型号为6N137。光耦隔离芯片6N137为高速光耦,转换延时典型值小于30纳秒,有利于降低触发延时时间。Further, the model of the optocoupler isolation chip is 6N137. The optocoupler isolation chip 6N137 is a high-speed optocoupler, and the typical conversion delay is less than 30 nanoseconds, which is beneficial to reduce the trigger delay time.
有益效果:与现有技术相比,本实用新型不仅有效的减少了触发延时,使触发反应时间缩短到大约100nS,而且能够接受的触发电压范围更宽,本实用新型中的触发电压能够达到DC30V~DC300V;同时,有效减小了整个触发电路的体积。Beneficial effects: Compared with the prior art, the utility model not only effectively reduces the trigger delay, shortens the trigger reaction time to about 100nS, but also has a wider range of acceptable trigger voltages. The trigger voltage in the utility model can reach DC30V ~ DC300V; at the same time, effectively reducing the size of the entire trigger circuit.
附图说明Description of drawings
图1为现有技术中采用的触发电路;Fig. 1 is the trigger circuit adopted in the prior art;
图2为本实用新型提供的触发电路的电路图。Fig. 2 is a circuit diagram of the trigger circuit provided by the utility model.
具体实施方式Detailed ways
下面结合附图对本实用新型做更进一步的解释。Below in conjunction with accompanying drawing, the utility model is further explained.
如图2所示,本实用新型公开了一种用于断路器的触发电路,包括加速电容回路3、光耦隔离芯片1和触发回路2,其中,触发电压信号通过加速电容回路3触发光耦隔离芯片1,光耦隔离芯片1通过触发回路2发出触发信号。As shown in Figure 2, the utility model discloses a trigger circuit for a circuit breaker, including an accelerating capacitor circuit 3, an optocoupler isolation chip 1 and a trigger circuit 2, wherein the trigger voltage signal triggers the optocoupler through the accelerating capacitor circuit 3 The isolation chip 1, the optocoupler isolation chip 1 sends a trigger signal through the trigger circuit 2.
其中,加速电容回路3包括第三电阻R3、第四电阻R4、第一电容C1和二极管D1,第三电阻R3的一端分别与触发电压和第四电阻R4的一端连接,第三电阻R3的另一端与第一电容C1的一端连接,第一电容C1的另一端分别与第四电阻R4、二极管D1的负极和光耦隔离芯片的第二引脚连接,二极管D1的正极分别与光耦隔离芯片的第三引脚、触发电压和地连接。触发回路2包括第二电阻R2,第二电阻R2的一端与光耦隔离芯片的第六引脚连接,第二电阻R2的另一端与光耦隔离芯片的第七引脚、第八引脚和3.3V的电源连接。光耦隔离芯片的第六引脚为触发信号输出端,光耦隔离芯片的第五引脚接地。Wherein, the accelerating capacitor circuit 3 includes a third resistor R 3 , a fourth resistor R 4 , a first capacitor C 1 and a diode D 1 , one end of the third resistor R 3 is respectively connected to the trigger voltage and one end of the fourth resistor R 4 , The other end of the third resistor R3 is connected to one end of the first capacitor C1 , and the other end of the first capacitor C1 is respectively connected to the fourth resistor R4 , the cathode of the diode D1 and the second pin of the optocoupler isolation chip, The anode of the diode D1 is respectively connected to the third pin of the optocoupler isolation chip, the trigger voltage and the ground. The trigger circuit 2 includes a second resistor R 2 , one end of the second resistor R 2 is connected to the sixth pin of the optocoupler isolation chip, and the other end of the second resistor R 2 is connected to the seventh pin, the eighth pin of the optocoupler isolation chip. pin and a 3.3V power supply connection. The sixth pin of the optocoupler isolation chip is the trigger signal output end, and the fifth pin of the optocoupler isolation chip is grounded.
在本实施例中,第三电阻R3为5.1KΩ,第四电阻R4为27KΩ,第二电阻R2为1KΩ;第一电容C1和第一电容C1的容值同为0.1uF;二极管D1的型号为1N4148;光耦隔离芯片的型号为6N137。其中,光耦隔离芯片6N137的引脚功能如表1所示。In this embodiment, the third resistor R3 is 5.1KΩ, the fourth resistor R4 is 27KΩ, and the second resistor R2 is 1KΩ; the capacitance values of the first capacitor C1 and the first capacitor C1 are both 0.1uF; the diode D The model of 1 is 1N4148; the model of optocoupler isolation chip is 6N137. Among them, the pin functions of the optocoupler isolation chip 6N137 are shown in Table 1.
表1Table 1
触发电压信号经过第三电阻R3,第四电阻R4和第一电容C1,然后进入光耦隔离芯片的第二引脚,并从光耦隔离芯片的第三引脚形成回路。光耦隔离芯片第七引脚和第八引脚并联,正常情况下光耦隔离芯片的第六引脚因为上拉电阻,即第二电阻R2而输出高电平,当有触发电压信号时,第六引脚变为低电平,此信号为触发信号。The trigger voltage signal passes through the third resistor R 3 , the fourth resistor R 4 and the first capacitor C 1 , and then enters the second pin of the optocoupler isolation chip, and forms a loop from the third pin of the optocoupler isolation chip. The seventh pin of the optocoupler isolation chip is connected in parallel with the eighth pin. Under normal circumstances, the sixth pin of the optocoupler isolation chip outputs a high level because of the pull-up resistor, that is, the second resistor R2 . When there is a trigger voltage signal , the sixth pin becomes low level, this signal is a trigger signal.
一般DC110V动作电压的断路器,由于低压动作电压测试的动作电压为额定动作电压的30%,所以其低压动作测试的电压为DC30V。为了兼顾DC30V的触发电压,设计加速电容电路,第三电阻R3的阻值为5.1KΩ,当触发电压发生的一瞬间,第一电容C1相当于短路,此时触发电流为30V/5.1K=6mA,从而可以瞬间满足光耦隔离芯片的导通。当第一电容C1充电饱和后,该支路电流截止,电压信号经过第四电阻R4加载到光耦隔离芯片上,保证在触发整个过程中光耦隔离芯片均处在导通状态。Generally, for circuit breakers with DC110V operating voltage, since the operating voltage of the low-voltage operating voltage test is 30% of the rated operating voltage, the voltage of the low-voltage operating voltage test is DC30V. In order to take into account the trigger voltage of DC30V, an accelerating capacitor circuit is designed. The resistance of the third resistor R 3 is 5.1KΩ. When the trigger voltage occurs, the first capacitor C 1 is equivalent to a short circuit. At this time, the trigger current is 30V/5.1K =6mA, so that the conduction of the optocoupler isolation chip can be met instantly. When the first capacitor C1 is charged and saturated, the branch current is cut off, and the voltage signal is loaded to the optocoupler isolation chip through the fourth resistor R4 to ensure that the optocoupler isolation chip is in the conduction state during the whole triggering process.
以上所述仅是本实用新型的优选实施方式,应当指出:对于本技术领域的普通技术人员来说,在不脱离本实用新型原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本实用新型的保护范围。The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.
Claims (5)
- A kind of 1. trigger circuit for breaker, it is characterised in that:Including speed-up capacitor circuit, light-coupled isolation chip and triggering Circuit, wherein, trigger voltage signal triggers light-coupled isolation chip by speed-up capacitor circuit, and light-coupled isolation chip is by triggering back Road sends trigger signal;The speed-up capacitor circuit includes 3rd resistor R3, the 4th resistance R4, the first capacitance C1With diode D1, Wherein, 3rd resistor R3One end respectively with trigger voltage and the 4th resistance R4One end connection, 3rd resistor R3The other end with First capacitance C1One end connection, the first capacitance C1The other end respectively with the 4th resistance R4, diode D1Anode and optocoupler every The second pin connection of off-chip piece, diode D1Cathode the 3rd pin, trigger voltage and the ground with light-coupled isolation chip respectively Connection.
- 2. the trigger circuit according to claim 1 for breaker, it is characterised in that:The trigger circuit includes second Resistance R2, second resistance R2One end and light-coupled isolation chip the 6th pin connect, second resistance R2The other end and optocoupler every The 7th pin, the 8th pin of off-chip piece are connected with the power supply of 3.3V, the 3rd resistor R3For 5.1K Ω, the 4th resistance R4For 27K Ω, second resistance R2For 1K Ω.
- 3. the trigger circuit according to claim 1 for breaker, it is characterised in that:First capacitance C1Capacitance be 0.1uF。
- 4. the trigger circuit according to claim 1 for breaker, it is characterised in that:The diode D1Model 1N4148。
- 5. the trigger circuit according to claim 1 for breaker, it is characterised in that:The type of the light-coupled isolation chip Number it is 6N137.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108736872A (en) * | 2018-04-26 | 2018-11-02 | 西安微电子技术研究所 | A kind of ignition drive circuit |
CN109556871A (en) * | 2018-12-13 | 2019-04-02 | 西安航天动力研究所 | A kind of liquid-propellant rocket engine Timing Signal detection system and method |
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2017
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108736872A (en) * | 2018-04-26 | 2018-11-02 | 西安微电子技术研究所 | A kind of ignition drive circuit |
CN109556871A (en) * | 2018-12-13 | 2019-04-02 | 西安航天动力研究所 | A kind of liquid-propellant rocket engine Timing Signal detection system and method |
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