CN207559852U - Constant current-supplying circuit capable of fast starting - Google Patents
Constant current-supplying circuit capable of fast starting Download PDFInfo
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Abstract
可快速启动的恒流供电电路，属于节能供电技术领域。本实用新型是为了解决现有供电电路在启动过程中会额外增加用电回路功耗的问题。它包括交流输入插座AC、保险丝FS1 、电容CX1、杂讯滤波器LF1、交流直流转换器BD1、滤波电容CK1、快速启动回路、变压器T1B、电阻RH1、二极管DH1、滤波电容CH1和电源芯片PWM IC，快速启动回路连接在杂讯滤波器LF1和交流直流转换器BD1之间。本实用新型用于恒流供电。
A constant-current power supply circuit capable of quick start belongs to the technical field of energy-saving power supply. The utility model aims to solve the problem that the power consumption of the power consumption circuit will be additionally increased during the start-up process of the existing power supply circuit. It includes AC input socket AC, fuse FS1, capacitor CX1, noise filter LF1, AC-DC converter BD1, filter capacitor CK1, fast start circuit, transformer T1B, resistor RH1, diode DH1, filter capacitor CH1 and power chip PWM IC , the quick start loop is connected between the noise filter LF1 and the AC-DC converter BD1. The utility model is used for constant current power supply.
Description
技术领域technical field
本实用新型涉及可快速启动的恒流供电电路，属于节能供电技术领域。The utility model relates to a constant-current power supply circuit capable of quick start, and belongs to the technical field of energy-saving power supply.
背景技术Background technique
随着能效升级，对供电的节能模式要求愈发严苛。现有供电电路在启动过程中供电电流逐渐增大，然后进入到正常工作状态，而对于整个用电回路，电流逐渐增大的启动过程增加了用电功耗。With the upgrading of energy efficiency, the requirements for energy-saving mode of power supply are becoming more and more stringent. The current of the existing power supply circuit gradually increases during the start-up process, and then enters into a normal working state, but for the entire power consumption circuit, the start-up process with the current gradually increasing increases the power consumption.
实用新型内容Utility model content
本实用新型是为了解决现有供电电路在启动过程中会额外增加用电回路功耗的问题，提供了一种可快速启动的恒流供电电路。The utility model aims to solve the problem that the power consumption of the power consumption circuit will be additionally increased during the start-up process of the existing power supply circuit, and provides a constant current power supply circuit capable of quick start.
本实用新型所述可快速启动的恒流供电电路，它包括交流输入插座AC、保险丝FS1、电容CX1、杂讯滤波器LF1、交流直流转换器BD1、滤波电容CK1、快速启动回路、变压器T1B、电阻RH1、二极管DH1、滤波电容CH1和电源芯片PWM IC，The quick-start constant current power supply circuit of the utility model includes an AC input socket AC, a fuse FS1, a capacitor CX1, a noise filter LF1, an AC-DC converter BD1, a filter capacitor CK1, a quick-start circuit, a transformer T1B, Resistor RH1, diode DH1, filter capacitor CH1 and power chip PWM IC,
交流输入插座AC的火线端L连接保险丝FS1的一端，保险丝FS1的另一端连接电容CX1的一端，电容CX1的另一端连接交流输入插座AC的零线端N；The live wire terminal L of the AC input socket AC is connected to one end of the fuse FS1, the other end of the fuse FS1 is connected to one end of the capacitor CX1, and the other end of the capacitor CX1 is connected to the neutral terminal N of the AC input socket AC;
电容CX1的两端与杂讯滤波器LF1的两个输入端一一对应连接，杂讯滤波器LF1的输出端连接交流直流转换器BD1的交流输入端，交流直流转换器BD1的直流输出端正极连接滤波电容CK1的正极，交流直流转换器BD1的直流输出端负极连接滤波电容CK1的负极，滤波电容CK1的负极接地；The two ends of the capacitor CX1 are connected to the two input terminals of the noise filter LF1 in one-to-one correspondence, the output terminal of the noise filter LF1 is connected to the AC input terminal of the AC-DC converter BD1, and the positive pole of the DC output terminal of the AC-DC converter BD1 Connect the positive pole of the filter capacitor CK1, the negative pole of the DC output terminal of the AC-DC converter BD1 is connected to the negative pole of the filter capacitor CK1, and the negative pole of the filter capacitor CK1 is grounded;
快速启动回路包括二极管DX1、二极管DX2、电阻RX1、电阻RX2、电阻RX3、电阻RX4、三极管QX1、三极管QX2、二极管DX3、二极管DX4、电阻RX5、电阻RX6、电阻RX7和电容CX2，The quick start circuit includes diode DX1, diode DX2, resistor RX1, resistor RX2, resistor RX3, resistor RX4, transistor QX1, transistor QX2, diode DX3, diode DX4, resistor RX5, resistor RX6, resistor RX7 and capacitor CX2,
杂讯滤波器LF1的输出端正极连接二极管DX1的正极，杂讯滤波器LF1的输出端负极连接二极管DX2的正极，二极管DX1的负极与二极管DX2的负极连接；二极管DX1的负极与三极管QX1的集电极C之间依次串联电阻RX3和电阻RX4，二极管DX1的负极与三极管QX1的基极B之间依次串联电阻RX1和电阻RX2，三极管QX1的基极B连接三极管QX2的集电极C，三极管QX2的发射极E与三极管QX1的发射极E之间连接电阻RX5，三极管QX1的发射极E连接二极管DX4的正极，二极管DX4的负极连接三极管QX2的基极B；三极管QX2的基极B连接电阻RX6的一端，电阻RX6的另一端连接电容CX2的一端，电容CX2的另一端连接三极管QX2的发射极E；电阻RX6的另一端与二极管DX3的负极之间连接电阻RX7，二极管DX3的正极连接变压器T1B副边的正极，变压器T1B副边的负极接地；变压器T1B副边的正极与二极管DH1的正极之间连接电阻RH1，二极管DH1的负极连接滤波电容CH1的正极，滤波电容CH1的负极接地；滤波电容CH1的正极连接电源芯片PWM IC的Vcc引脚，电源芯片PWM IC的Vcc引脚连接三极管QX2的发射极E。The positive pole of the output terminal of the noise filter LF1 is connected to the positive pole of the diode DX1, the negative pole of the output terminal of the noise filter LF1 is connected to the positive pole of the diode DX2, the negative pole of the diode DX1 is connected to the negative pole of the diode DX2; the negative pole of the diode DX1 is connected to the set of the triode QX1 The resistor RX3 and the resistor RX4 are connected in series between the electrodes C, the resistor RX1 and the resistor RX2 are connected in series between the cathode of the diode DX1 and the base B of the transistor QX1, the base B of the transistor QX1 is connected to the collector C of the transistor QX2, and the transistor QX2’s The resistor RX5 is connected between the emitter E and the emitter E of the transistor QX1, the emitter E of the transistor QX1 is connected to the anode of the diode DX4, the cathode of the diode DX4 is connected to the base B of the transistor QX2; the base B of the transistor QX2 is connected to the resistor RX6 One end, the other end of the resistor RX6 is connected to one end of the capacitor CX2, and the other end of the capacitor CX2 is connected to the emitter E of the triode QX2; the other end of the resistor RX6 is connected to the resistor RX7 between the negative electrode of the diode DX3, and the positive electrode of the diode DX3 is connected to the transformer T1B pair The positive pole of the secondary side of the transformer T1B is grounded; the positive pole of the secondary side of the transformer T1B is connected to the positive pole of the diode DH1 with a resistor RH1, the negative pole of the diode DH1 is connected to the positive pole of the filter capacitor CH1, and the negative pole of the filter capacitor CH1 is grounded; the filter capacitor CH1 The anode of the power chip PWM IC is connected to the Vcc pin of the power chip PWM IC, and the Vcc pin of the power chip PWM IC is connected to the emitter E of the triode QX2.
本实用新型的优点：本实用新型在电源供电电路中增加了快速启动回路，快速启动回路在电源启动后能被自动关闭，使电源在快速启动的同时实现了节能模式供电。本实用新型有效减少了供电电路的接通时间，并降低了启动电路的功率损失。Advantages of the utility model: the utility model adds a quick start circuit in the power supply circuit, and the quick start circuit can be automatically closed after the power is started, so that the power supply can be powered in an energy-saving mode while the power is started quickly. The utility model effectively reduces the connection time of the power supply circuit and reduces the power loss of the starting circuit.
附图说明Description of drawings
图1是本实用新型所述可快速启动的恒流供电电路的电路原理图；Fig. 1 is the circuit schematic diagram of the constant current power supply circuit that can start quickly described in the utility model;
图2是可快速启动的恒流供电电路的另一种具体实施方式的电路原理图。Fig. 2 is a schematic circuit diagram of another embodiment of a fast-start constant current power supply circuit.
具体实施方式Detailed ways
具体实施方式一：下面结合图1说明本实施方式，本实施方式所述可快速启动的恒流供电电路，它包括交流输入插座AC、保险丝FS1、电容CX1、杂讯滤波器LF1、交流直流转换器BD1、滤波电容CK1、快速启动回路、变压器T1B、电阻RH1、二极管DH1、滤波电容CH1和电源芯片PWM IC，Specific Embodiment 1: The present embodiment will be described below in conjunction with FIG. 1. The constant current power supply circuit that can be quickly started in this embodiment includes an AC input socket AC, a fuse FS1, a capacitor CX1, a noise filter LF1, and an AC-DC converter. Device BD1, filter capacitor CK1, fast start circuit, transformer T1B, resistor RH1, diode DH1, filter capacitor CH1 and power chip PWM IC,
交流输入插座AC的火线端L连接保险丝FS1的一端，保险丝FS1的另一端连接电容CX1的一端，电容CX1的另一端连接交流输入插座AC的零线端N；The live wire terminal L of the AC input socket AC is connected to one end of the fuse FS1, the other end of the fuse FS1 is connected to one end of the capacitor CX1, and the other end of the capacitor CX1 is connected to the neutral terminal N of the AC input socket AC;
电容CX1的两端与杂讯滤波器LF1的两个输入端一一对应连接，杂讯滤波器LF1的输出端连接交流直流转换器BD1的交流输入端，交流直流转换器BD1的直流输出端正极连接滤波电容CK1的正极，交流直流转换器BD1的直流输出端负极连接滤波电容CK1的负极，滤波电容CK1的负极接地；The two ends of the capacitor CX1 are connected to the two input terminals of the noise filter LF1 in one-to-one correspondence, the output terminal of the noise filter LF1 is connected to the AC input terminal of the AC-DC converter BD1, and the positive pole of the DC output terminal of the AC-DC converter BD1 Connect the positive pole of the filter capacitor CK1, the negative pole of the DC output terminal of the AC-DC converter BD1 is connected to the negative pole of the filter capacitor CK1, and the negative pole of the filter capacitor CK1 is grounded;
快速启动回路包括二极管DX1、二极管DX2、电阻RX1、电阻RX2、电阻RX3、电阻RX4、三极管QX1、三极管QX2、二极管DX3、二极管DX4、电阻RX5、电阻RX6、电阻RX7和电容CX2，杂讯滤波器LF1的输出端正极连接二极管DX1的正极，杂讯滤波器LF1的输出端负极连接二极管DX2的正极，二极管DX1的负极与二极管DX2的负极连接；二极管DX1的负极与三极管QX1的集电极C之间依次串联电阻RX3和电阻RX4，二极管DX1的负极与三极管QX1的基极B之间依次串联电阻RX1和电阻RX2，三极管QX1的基极B连接三极管QX2的集电极C，三极管QX2的发射极E与三极管QX1的发射极E之间连接电阻RX5，三极管QX1的发射极E连接二极管DX4的正极，二极管DX4的负极连接三极管QX2的基极B；三极管QX2的基极B连接电阻RX6的一端，电阻RX6的另一端连接电容CX2的一端，电容CX2的另一端连接三极管QX2的发射极E；电阻RX6的另一端与二极管DX3的负极之间连接电阻RX7，二极管DX3的正极连接变压器T1B副边的正极，变压器T1B副边的负极接地；变压器T1B副边的正极与二极管DH1的正极之间连接电阻RH1，二极管DH1的负极连接滤波电容CH1的正极，滤波电容CH1的负极接地；滤波电容CH1的正极连接电源芯片PWM IC的Vcc引脚，电源芯片PWM IC的Vcc引脚连接三极管QX2的发射极E。The quick start circuit includes diode DX1, diode DX2, resistor RX1, resistor RX2, resistor RX3, resistor RX4, transistor QX1, transistor QX2, diode DX3, diode DX4, resistor RX5, resistor RX6, resistor RX7 and capacitor CX2, noise filter The positive pole of the output terminal of LF1 is connected to the positive pole of the diode DX1, the negative pole of the output terminal of the noise filter LF1 is connected to the positive pole of the diode DX2, and the negative pole of the diode DX1 is connected to the negative pole of the diode DX2; between the negative pole of the diode DX1 and the collector C of the transistor QX1 Resistor RX3 and resistor RX4 are connected in series in series, resistor RX1 and resistor RX2 are connected in series between the cathode of diode DX1 and base B of transistor QX1, base B of transistor QX1 is connected to collector C of transistor QX2, emitter E of transistor QX2 is connected to The emitter E of the transistor QX1 is connected to the resistor RX5, the emitter E of the transistor QX1 is connected to the anode of the diode DX4, the cathode of the diode DX4 is connected to the base B of the transistor QX2; the base B of the transistor QX2 is connected to one end of the resistor RX6, and the resistor RX6 The other end of the capacitor CX2 is connected to one end of the capacitor CX2, and the other end of the capacitor CX2 is connected to the emitter E of the transistor QX2; the other end of the resistor RX6 is connected to the negative electrode of the diode DX3, and the resistor RX7 is connected, and the positive electrode of the diode DX3 is connected to the positive electrode of the secondary side of the transformer T1B. The negative pole of the transformer T1B secondary side is grounded; the resistor RH1 is connected between the positive pole of the transformer T1B secondary side and the positive pole of the diode DH1, the negative pole of the diode DH1 is connected to the positive pole of the filter capacitor CH1, and the negative pole of the filter capacitor CH1 is grounded; the positive pole of the filter capacitor CH1 is connected to the power supply The Vcc pin of the chip PWM IC, the Vcc pin of the power chip PWM IC is connected to the emitter E of the transistor QX2.
所述杂讯滤波器LF1可以由共模电感LF1B和LF1A组成，电容CX1的一端连接电感LF1B的一端，电容CX1的另一端连接电感LF1A的一端，电感LF1B的另一端连接二极管DX1的正极，电感LF1A的另一端连接二极管DX2的正极。The noise filter LF1 may be composed of common mode inductors LF1B and LF1A, one end of the capacitor CX1 is connected to one end of the inductor LF1B, the other end of the capacitor CX1 is connected to one end of the inductor LF1A, the other end of the inductor LF1B is connected to the anode of the diode DX1, and the inductor The other end of LF1A is connected to the anode of diode DX2.
结合图1中所示的快速启动回路，当交流输入插座AC插入市电时，电压通过二极管DX1和二极管DX2整流，并给三极管QX1提供偏置电压，三极管QX1导通；此时通过由电阻RX3、电阻RX4、三极管QX1和电阻RX5形成的低阻抗通路给滤波电容CH1充电。Combined with the quick start circuit shown in Figure 1, when the AC input socket AC is plugged into the mains, the voltage is rectified by the diode DX1 and the diode DX2, and the bias voltage is provided to the transistor QX1, and the transistor QX1 is turned on; at this time, the resistor RX3 , resistor RX4, triode QX1 and resistor RX5 form a low-impedance path to charge the filter capacitor CH1.
当电阻RX5的电压大于三极管QX2的基极与发射极之间电压Vbe与二极管DX4的电压和时，三极管QX2导通，QX1截止。然后电阻RX5的电压为零，三极管QX2截止，QX1导通。重复该过程，即达到恒流启动的效果。当滤波电容CH1上的电压充电到电源芯片PWM IC的开启门限电压时，电源启动完成。When the voltage of the resistor RX5 is greater than the sum of the voltage Vbe between the base and emitter of the transistor QX2 and the voltage of the diode DX4, the transistor QX2 is turned on and QX1 is turned off. Then the voltage of resistor RX5 is zero, transistor QX2 is cut off, and QX1 is turned on. Repeat this process to achieve the effect of constant current startup. When the voltage on the filter capacitor CH1 is charged to the turn-on threshold voltage of the power chip PWM IC, the power supply is started.
在电源启动后，变压器T1B通过二极管DH1给电源芯片PWM IC供电；因变压器漏感原因，图1中Vaux处的电压将大于Vcc处电压，Vaux通过二极管DX3和电阻RX7给电容CX2充电，电容CX2通过电阻RX6为三极管QX2提供基极电流，使三极管QX2导通；QX2导通后把三极管QX1的Vbe电压拉低，从而使三极管QX1关断，断开由电阻RX3、电阻RX4、三极管QX1_CE和电阻RX5组成的启动电阻回路，从而减少回路功耗。After the power is turned on, the transformer T1B supplies power to the power chip PWM IC through the diode DH1; due to the leakage inductance of the transformer, the voltage at Vaux in Figure 1 will be greater than the voltage at Vcc, and Vaux charges the capacitor CX2 through the diode DX3 and the resistor RX7, and the capacitor CX2 Provide base current for transistor QX2 through resistor RX6, so that transistor QX2 is turned on; after QX2 is turned on, the Vbe voltage of transistor QX1 is pulled down, so that transistor QX1 is turned off, and the resistor RX3, resistor RX4, transistor QX1_CE and resistor The starting resistor loop composed of RX5 reduces loop power consumption.
图2是本实用新型的一种衍生线路：图1中快速启动回路连接在杂讯滤波器LF1和交流直流转换器BD1之间，图2中速启动回路连接在滤波电容CK1的输出端。将二者进行比较可知，图1所示供电电路可以快速重启，而图2所示供电电路在一次启动结束后，需要等待滤波电容CK1的电压释放完毕后才可以重新启动。Fig. 2 is a derivative circuit of the present invention: in Fig. 1, the fast start-up circuit is connected between the noise filter LF1 and the AC-DC converter BD1, and in Fig. 2, the medium-speed start-up circuit is connected to the output end of the filter capacitor CK1. Comparing the two, it can be seen that the power supply circuit shown in Figure 1 can be quickly restarted, while the power supply circuit shown in Figure 2 needs to wait for the voltage of the filter capacitor CK1 to be released before restarting after a start-up.
所述电阻RX1~RX5的取值范围可以为：1Ω~20MΩ。The value range of the resistors RX1~RX5 may be: 1Ω~20MΩ.
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