CN102176181B - A kind of constant current source power supply circuit of Point type optical smoke detector - Google Patents
A kind of constant current source power supply circuit of Point type optical smoke detector Download PDFInfo
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- CN102176181B CN102176181B CN201110009436.3A CN201110009436A CN102176181B CN 102176181 B CN102176181 B CN 102176181B CN 201110009436 A CN201110009436 A CN 201110009436A CN 102176181 B CN102176181 B CN 102176181B
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Abstract
本发明公开了一种点型光电感烟探测器的恒流源供电电路，包括放大电路，放大电路的电源输入端和放大电路之间接入了电流基准电路。在本发明解决了现有点型火灾探测器的稳压电路消耗电流过大，造成回路负载下降，导致较大误差的问题，且具有较高的耐压值，没有使用特殊的元件，易于搭建和调试，有利于降低产品的成本。
The invention discloses a constant current source power supply circuit of a point-type photoelectric smoke detector, which includes an amplifier circuit, and a current reference circuit is connected between the power input end of the amplifier circuit and the amplifier circuit. The invention solves the problem that the current consumption of the voltage stabilizing circuit of the existing point-type fire detector is too large, which causes the load of the circuit to drop, resulting in a large error, and has a high withstand voltage value, without using special components, and is easy to build and install. Debugging is conducive to reducing the cost of the product.
Description
技术领域 technical field
本发明涉及一种光电感烟探测器供电电路，尤其涉及一种点型光电感烟探测器的恒流源供电电路。The invention relates to a power supply circuit for a photoelectric smoke detector, in particular to a constant current source power supply circuit for a point-type photoelectric smoke detector.
背景技术 Background technique
现有的点型光电感烟探测器(点型火灾探测器)的工作原理是：通过红外光线传感器来测量烟的浓度，探测器的迷宫在结构设计时红外光束是偏离传感器的。当烟雾进入到迷宫内，烟雾粒子会将部分光束散射到传感器上。若烟雾的浓度逐渐增加，就会有更多的光束被散射到传感器上。在到达传感器的光束达到一定的程度探测器就会报警，报警时探测器指示灯常亮，并向控制器反馈火警信号，直到复位控制器为止。控制器通过检测回路中探测器反馈的火警信号启动控制设备。在对这些探测器进行供电的过程中，通常采用稳压源进行供电，由于稳压源的功耗较高，而在火灾报警系统中所使用的点型火灾探测器的数量较多，且24小时工作，因此总的功耗浪费非常大。The operating principle of existing point-type photoelectric smoke detectors (point-type fire detectors) is: the concentration of smoke is measured by infrared light sensors, and the infrared light beam deviates from the sensor during the structural design of the labyrinth of the detector. When smoke enters the maze, smoke particles scatter part of the light beam onto the sensor. As the concentration of smoke increases, more light beams are scattered onto the sensor. When the light beam reaching the sensor reaches a certain level, the detector will alarm, and the indicator light of the detector is always on when the alarm occurs, and feeds back the fire alarm signal to the controller until the controller is reset. The controller activates the control equipment through the fire alarm signal fed back by the detector in the detection circuit. In the process of supplying power to these detectors, a stabilized voltage source is usually used for power supply. Due to the high power consumption of the stabilized voltage source, the number of point-type fire detectors used in the fire alarm system is large, and 24 Hours of work, so the total waste of power consumption is very large.
如图1所示，为现有的点型火灾探测器电路构成示意图，从图中可以看出，该电路给单片机供电电源为稳压电路，由于点型火灾探测器都是在微安极以下工作的，而稳压电路本身消耗电流过大(不适合太小的电流)，会造回路负载下降，从而导致较大的误差。As shown in Figure 1, it is a schematic diagram of the existing point-type fire detector circuit. It can be seen from the figure that the power supply of the circuit to the single-chip microcomputer is a voltage-stabilizing circuit. Since the point-type fire detectors are all below the microampere Working, and the voltage regulator circuit itself consumes too much current (not suitable for too small current), which will cause the load of the circuit to drop, resulting in a large error.
发明内容 Contents of the invention
本发明提供了一种点型光电感烟探测器的恒流源供电电路，以解决现有点型火灾探测器的稳压电路消耗电流过大，造成回路负载下降，导致较大误差的问题。The invention provides a constant current source power supply circuit of a point-type photoelectric smoke detector to solve the problem that the current consumption of the voltage stabilizing circuit of the existing point-type fire detector is too large, which causes the load of the circuit to drop and causes a large error.
为达上述目的，本发明提供了一种点型光电感烟探测器的恒流源供电电路，包括放大电路，所述放大电路的电源输入端和放大电路之间接入了电流基准电路。To achieve the above purpose, the present invention provides a constant current source power supply circuit for a point-type photoelectric smoke detector, including an amplifying circuit, and a current reference circuit is connected between the power input terminal of the amplifying circuit and the amplifying circuit.
在本发明的一种点型光电感烟探测器的恒流源供电电路中，上述放大电路是由一NPN型的三极管及设置在其基极上的用于调节电流的第一电阻和第二电阻构成，其中，第一电阻与第二电阻一端均接至该一NPN型的三极管的基极，第一电阻的另一端接地。In a constant current source power supply circuit of a point-type photoelectric smoke detector of the present invention, the amplifying circuit is composed of an NPN transistor and a first resistor and a second The resistor is formed, wherein, one end of the first resistor and the second resistor are both connected to the base of the NPN transistor, and the other end of the first resistor is grounded.
在本发明的一种点型光电感烟探测器的恒流源供电电路中，上述电流基准电路主要由两只同型的PNP型三极管集电极和基极相联而成，其中一PNP型三极管的基极与另一PNP型三极管的发射极串接后通过第三电阻串接至电源输入端和NPN型的三极管的集电极的节点，该一PNP型三极管的发射极接至该节点，该一PNP型三极管的集电极与另一PNP型三极管的基极串接后通过第四电阻接地；该另一PNP型三极管的集电极串接至第二电阻与稳压管的节点，该稳压管的另一端接地。In the constant current source power supply circuit of a point-type photoelectric smoke detector of the present invention, the above-mentioned current reference circuit is mainly formed by connecting the collector and base of two PNP transistors of the same type, and one of the PNP transistors The base is connected in series with the emitter of another PNP transistor and then connected in series to the node of the power supply input terminal and the collector of the NPN transistor through a third resistor, and the emitter of the PNP transistor is connected to the node. The collector of the PNP transistor is connected in series with the base of another PNP transistor and grounded through the fourth resistor; the collector of the other PNP transistor is connected in series to the node of the second resistor and the voltage regulator tube The other end of the ground.
在本发明的一种点型光电感烟探测器的恒流源供电电路中，上述电源输入端和一PNP型三极管的集电极之间串接有一二极管。In the constant current source power supply circuit of the point photoelectric smoke detector of the present invention, a diode is connected in series between the input end of the power supply and the collector of a PNP transistor.
在本发明的一种点型光电感烟探测器的恒流源供电电路中，上述电源输入端和NPN型的三极管的集电极的节点之间串接一二极管。In the constant current source power supply circuit of the point photoelectric smoke detector of the present invention, a diode is connected in series between the node of the power input terminal and the collector of the NPN triode.
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:
本发明中，通过将两只同型的三极管B，C极相联，利用三极管相对稳定的be电压作为基准，降低了电源电路的本身电流消耗，能够满足点型火灾探测器都是在微安极以下工作的要求；通过第一电阻和第二电阻调节电流大小，实现电流的数值的可以自由控制，具有较高的耐压值。也没有使用特殊的元件，有利于降低产品的成本，除了足够的精度和可调性之外，使用的元件也都是很普遍的，易于搭建和调试。In the present invention, by connecting two triodes B and C poles of the same type, and using the relatively stable be voltage of the triode as a reference, the current consumption of the power supply circuit itself is reduced, and it is possible to meet the requirements of point-type fire detectors that operate at microamperes. The requirements of the following work: adjust the magnitude of the current through the first resistor and the second resistor, realize the free control of the value of the current, and have a higher withstand voltage value. No special components are used, which is beneficial to reduce the cost of the product. In addition to sufficient precision and adjustability, the components used are also very common, easy to build and debug.
附图说明 Description of drawings
图1是现有点型火灾探测器电路构成示意图。Fig. 1 is a schematic diagram of the existing point type fire detector circuit.
图2是改进后的点型火灾探测器电路构成示意图。Figure 2 is a schematic diagram of the improved point-type fire detector circuit.
图3是改进后的点型火灾探测器的供电电路图。Figure 3 is a power supply circuit diagram of the improved point-type fire detector.
具体实施方式 detailed description
下面将结合本发明中的附图，对本发明中的技术方案进行清楚、完整的描述，显然，所描述的实施例是本发明的一部分实施例，而不是全部的实施例。基于本发明的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所获得的所有其他实施例，都属于本发明保护的范围。The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
如图2所示，本发明提供的点型火灾探测器的供电电路主要由单片机、收发数据电路、发射电路、接收电路、运放电路、启振电路和恒流源供电电路构成。As shown in Figure 2, the power supply circuit of the point-type fire detector provided by the present invention is mainly composed of a single-chip microcomputer, a data sending and receiving circuit, a transmitting circuit, a receiving circuit, an operational amplifier circuit, an initiating vibration circuit and a constant current source power supply circuit.
如图3所示，本发明提供的点型光电感烟探测器的恒流源供电电路，主要由放大电路和电流基准电路构成，具体讲，放大电路是由一NPN型的三极管V3及设置在其基极上的用于调节电流的第一电阻R6和第二电阻R5构成，其中第一电阻R6与第二电阻R5一端均接至三极管V3的基极，第一电阻R6的另一端接地；而电流基准电路主要由两只同型的PNP型三极管V1、V2构成，其中三极管V1的基极与三极管V2的发射极串接后通过第三电阻R3串接至电源输入端和NPN型的三极管V3的集电极的节点，三极管V1的发射极接至该节点，其集电极与另一三极管V2的基极串接后通过第四电阻R4接地；该另一PNP型三极管V2的集电极串接至第二电阻R5与稳压管DW1的节点，该稳压管DW1的另一端接地。As shown in Figure 3, the constant current source power supply circuit of the point-type photoelectric smoke detector provided by the present invention is mainly composed of an amplifying circuit and a current reference circuit. Specifically, the amplifying circuit is composed of an NPN type transistor V3 and a Its base is composed of a first resistor R6 and a second resistor R5 for adjusting the current, wherein both ends of the first resistor R6 and the second resistor R5 are connected to the base of the triode V3, and the other end of the first resistor R6 is grounded; The current reference circuit is mainly composed of two PNP transistors V1 and V2 of the same type, in which the base of the transistor V1 is connected in series with the emitter of the transistor V2, and then connected in series to the input terminal of the power supply and the NPN transistor V3 through the third resistor R3 The node of the collector, the emitter of the triode V1 is connected to this node, the collector is connected in series with the base of another triode V2 and grounded through the fourth resistor R4; the collector of the other PNP transistor V2 is connected in series to The node between the second resistor R5 and the regulator DW1, the other end of the regulator DW1 is grounded.
同时，为了降低该电路的干扰，提高其坑干扰性，本电路的三极管V3的发射极与单片机的电源输入脚之间设置了滤波电容C2和C3。At the same time, in order to reduce the interference of this circuit and improve its pit interference, filter capacitors C2 and C3 are set between the emitter of the triode V3 of this circuit and the power input pin of the single-chip microcomputer.
值得注意的是，该电路中的三极管V3起电流放大的作用。It is worth noting that the triode V3 in this circuit plays the role of current amplification.
同时，为了防止电路接反，在电源输入端串接了一二极管R32，同时起隔离的作用。At the same time, in order to prevent the reverse connection of the circuit, a diode R32 is connected in series at the input end of the power supply, which also plays the role of isolation.
本技术方案通过将两只同型的三极管B，C极相联，利用三极管相对稳定的be电压作为基准，降低了电源电路的本身电流消耗，能够满足点型火灾探测器都是在微安极以下工作的要求；通过第一电阻和第二电阻调节电流大小，实现电流的数值的可以自由控制，具有较高的耐压值。也没有使用特殊的元件，有利于降低产品的成本，除了足够的精度和可调性之外，使用的元件也都是很普遍的，易于搭建和调试。This technical solution connects two triodes B and C poles of the same type, and uses the relatively stable be voltage of the triode as a reference to reduce the current consumption of the power circuit itself, which can meet the requirements of point-type fire detectors below microamperes. Requirements for work: adjust the magnitude of the current through the first resistor and the second resistor, realize the free control of the value of the current, and have a higher withstand voltage value. No special components are used, which is beneficial to reduce the cost of the product. In addition to sufficient precision and adjustability, the components used are also very common, easy to build and debug.
上面结合附图对本发明进行了示例性的描述，显然本发明的实现并不受上述方式的限制，只要采用了本发明的方法构思和技术方案进行的各种改进，或未经改进将本发明的构思和技术方案直接应用于其它场合的，均在本发明的保护范围内。Above, the present invention has been exemplarily described in conjunction with the accompanying drawings. Obviously, the realization of the present invention is not limited by the above-mentioned manner, as long as various improvements of the method concept and technical solutions of the present invention are adopted, or the present invention is implemented without improvement. The ideas and technical schemes directly applied to other occasions are within the protection scope of the present invention.
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| CN103578218B (en) * | 2012-07-31 | 2016-05-18 | 西门子瑞士有限公司 | The line drive circuit of fire alarm system and corresponding fire alarm system |
| CN107834850A (en) * | 2017-11-17 | 2018-03-23 | 广东乐心医疗电子股份有限公司 | DC linear voltage-stabilized power supply circuit |
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