WO2016050127A1 - Mos tube-based constant current circuit - Google Patents

Mos tube-based constant current circuit Download PDF

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Publication number
WO2016050127A1
WO2016050127A1 PCT/CN2015/088156 CN2015088156W WO2016050127A1 WO 2016050127 A1 WO2016050127 A1 WO 2016050127A1 CN 2015088156 W CN2015088156 W CN 2015088156W WO 2016050127 A1 WO2016050127 A1 WO 2016050127A1
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resistor
power supply
input end
constant current
output end
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PCT/CN2015/088156
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French (fr)
Chinese (zh)
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张�杰
谭建
熊振华
王勇
崔万恒
冷永林
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中兴通讯股份有限公司
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Publication of WO2016050127A1 publication Critical patent/WO2016050127A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers

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  • Embodiments of the present invention relate to, but are not limited to, the field of power supply load control, and in particular, to a constant current circuit based on a MOS tube.
  • the embodiment of the invention provides a constant current circuit based on a MOS tube, which can overcome more problems of energy loss caused by high power resistance in the power load circuit.
  • the embodiment of the invention provides a constant current circuit based on a MOS tube, comprising: a constant current load circuit and a control circuit, wherein
  • the control circuit includes: a first power supply terminal connected to the circuit to be tested, and a first differential circuit and a first branch respectively connected between the input end and the output end of the first power supply end;
  • the first branch includes a second resistor a second voltage regulator tube and a triode tube, the input end of the second resistor is connected to the output end of the first power source end, the output end of the second resistor is connected to the input end of the second voltage regulator tube, and the output end of the second voltage regulator tube is The base of the triode is connected, and the emitter of the triode is connected to the input end of the first power terminal;
  • the constant current load circuit includes: a second power supply terminal connected to the external power source, a second differential circuit, a second branch and a third branch respectively connected in parallel with the second power supply end; and the second branch includes: a fourth resistor a MOS transistor and a sixth resistor, wherein the input end of the fourth resistor is connected to the output end of the second power supply terminal, the output end of the fourth resistor is connected to the drain of the MOS transistor, and the source of the MOS transistor is connected to the input end of the sixth resistor The output end of the sixth resistor is connected to the input end of the second power terminal;
  • the third branch includes: a third resistor and a seventh resistor, wherein the input end of the third resistor is connected to the output end of the second power terminal, the output end of the third resistor is connected to the input end of the seventh resistor, and the seventh resistor
  • the input end is connected in parallel with the gate of the MOS tube and the collector of the triode, and the output end of the seventh resistor is connected to the input end of the second power terminal; the first voltage regulator is connected in parallel with both ends of the seventh resistor.
  • the triode is an NPN type triode.
  • the MOS transistor is an N-channel type MOS transistor.
  • the first differential circuit is formed by connecting the first capacitor and the first resistor in parallel, and the input end of the first capacitor and the input end of the first resistor are respectively connected to the output end of the first power terminal, and the output end of the first capacitor is The output ends of the first resistors are respectively connected to the input terminals of the first power supply terminal.
  • the second differential circuit is formed by the second capacitor and the fifth resistor being connected in parallel, and the input end of the second capacitor and the fifth resistor input are respectively connected to the output end of the second power source, and the output end of the second capacitor is The output terminals of the five resistors are respectively connected to the input terminals of the second power source.
  • the first power terminal is a current collecting circuit
  • the current collecting circuit is composed of a current transformer and a first rectifier; the input end of the current transformer is set to be connected with the circuit to be tested, the output end of the current transformer and the first rectifier The input is connected, and the output of the first rectifier is connected in parallel with the first differentiating circuit.
  • the first rectifier is a bridge rectifier.
  • the rectifying element of the first rectifier is a diode.
  • the first power terminal is a current monitoring circuit provided with a current monitoring chip.
  • the second power terminal comprises: a transformer and a second rectifier.
  • the second power terminal is connected to the primary of the transformer.
  • the transformer is provided with a transformer that is a load winding, and the second power terminal is connected in parallel to the load winding.
  • the second rectifier is a bridge rectifier.
  • the rectifying element of the second rectifier is a diode.
  • the MOS tube-based constant current circuit provided by the embodiment of the invention can adjust the configuration of the resistor
  • the current in the control circuit limits the current to the required range; when the current reaches a certain value, the constant current load circuit can be turned off to avoid excessive energy loss and improve the working efficiency of the power supply.
  • FIG. 1 is a schematic circuit diagram of a MOS tube-based constant current circuit according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of circuit connection of a second power terminal connected to a primary of a transformer according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of circuit connection of a second power terminal of a transformer provided with a load winding according to an embodiment of the invention.
  • R1 first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; VD1, first voltage regulator; VD2, second voltage regulator; VT1, triode; VT2, MOS tube; C1, first capacitor; C2, second capacitor; T1, current transformer; T2, transformer; D1, first rectifier; D2, second rectifier .
  • the embodiment provides a constant current circuit based on a MOS tube, including: a constant current load circuit and a control circuit, wherein
  • the control circuit includes: a first power supply terminal connected to the circuit to be tested, and a first differential circuit and a first branch respectively connected between the input end and the output end of the first power supply end; wherein, the first power supply end
  • the power monitoring circuit or the current collecting circuit is provided with a current monitoring chip; the current monitoring circuit can transmit the current of the circuit to be tested to the first differential circuit and the first branch; the current collecting circuit is composed of the current transformer T1 and the first rectifier D1
  • the first rectifier D1 is a bridge rectifier, and the rectifying component of the first rectifier D1 is a diode.
  • the current transformer T1 converts the collected current into a voltage and transmits it to the first rectifier D1, and the first rectifier D1 converts the alternating current. It is DC.
  • the first differential circuit is formed by the first capacitor C1 being connected in parallel with the first resistor R1, and the first The input end of the capacitor C1 and the input end of the first resistor R1 are respectively connected to the output end of the first power terminal, and the output end of the first capacitor C1 and the output end of the first resistor R1 are respectively connected to the input end of the first power terminal, first The voltage supplied from the power supply is filtered by the first differential circuit and transmitted to the first branch.
  • the first branch includes a second resistor R2, a second Zener diode VD2, and a transistor VT1.
  • the input end of the second resistor R2 is connected to the output end of the first power terminal, and the output end of the second resistor R2 is connected to the second Zener diode VD2.
  • the input end is connected, the output end of the second Zener diode VD2 is connected to the base of the triode VT1, and the emitter of the triode VT1 is connected to the input end of the first power supply terminal; optionally, the triode VT1 is an NPN type triode.
  • the constant current load circuit includes: a second power supply terminal connected to the external power source, and a second differential circuit, a second branch and a third branch between the input end and the output end of the second power supply terminal; optionally
  • the second power terminal includes a transformer T2 and a second rectifier D2;
  • the second power terminal can be connected to the primary of the transformer T2 to take power from the primary of the transformer T2; see FIG. 3, the transformer T2 can be a transformer with a load winding, and the second power terminal can be connected in parallel to the load winding;
  • the second rectifier D2 is a bridge rectifier, and the rectifying element of the second rectifier D2 is a diode.
  • the second differential circuit is formed by the second capacitor C2 and the fifth resistor R5 being connected in parallel.
  • the input end of the second capacitor C2 and the input end of the fifth resistor R5 are respectively connected to the output end of the second power source, and the second capacitor is connected.
  • the output end of C2 and the output end of the fifth resistor R5 are respectively connected to the input end of the second power supply end.
  • the second branch includes: a fourth resistor R4, a MOS transistor VT2, and a sixth resistor R6.
  • the input end of the fourth resistor R4 is connected to the output end of the second power terminal, and the output terminal of the fourth resistor R4 and the drain of the MOS transistor VT2 Connected, the source of the MOS transistor VT2 is connected to the input end of the sixth resistor R6, and the output end of the sixth resistor R6 is connected to the input end of the second power supply terminal; alternatively, the MOS transistor VT2 is an N-channel type MOS transistor.
  • the third branch includes: a third resistor R3 and a seventh resistor R7, wherein the input end of the third resistor R3 is connected to the output end of the second power terminal, and the output end of the third resistor R3 is connected to the input end of the seventh resistor R7
  • the input end of the seventh resistor R7 is connected in parallel with the gate of the MOS transistor VT2 and the collector of the transistor VT1, and the output end of the seventh resistor R7 is connected to the input end of the second power supply terminal; the two ends of the seventh resistor R7 are connected in parallel A Zener tube VD1.
  • the third resistor R3 and the seventh resistor R7 are selected from a large resistance chip resistor, and the fourth resistor R4 and the sixth resistor R6 are selected from a metal film resistor having a relatively small resistance value.
  • the three-stage tube VT1 When the current collected by the current collecting circuit is converted by the first rectifier D1, and the supplied voltage does not reach the threshold voltage of the three-stage tube VT1, the three-stage tube VT1 is in an off state; at this time, the MOS tube VT2 is in an on state,
  • the two branches have current passing through; and the third branch is a large resistance resistor in the third resistor R3 and the seventh resistor R7, and the current is very small and negligible.
  • the voltage supplied by the second power supply terminal be U
  • the voltage of the gate of MOS transistor VT2 be U g
  • the voltage between the gate and the source of MOS transistor VT2 be U gs
  • the threshold voltage of MOS transistor VT2 be U gs(th)
  • the current I in the constant current load circuit can be adjusted by the third resistor R3 and the seventh resistor R7, and the current maximum value I a is:
  • the three-stage tube VT1 When the current collected by the current collecting circuit is converted by the first rectifier D1, and the supplied voltage reaches the threshold voltage of the three-stage tube VT1, the three-stage tube VT1 is in an on state, and the collector of the three-stage tube VT1 is turned to the MOS.
  • the VT2 gate provides voltage, the MOS transistor VT2 is turned off, no current flows through the second branch, and the constant current load circuit is turned off, which reduces energy loss and improves the efficiency of the power supply.
  • the MOS tube-based constant current circuit provided by the embodiment of the invention can control the current in the circuit by adjusting the configuration of the resistor to limit the current within the required range; when the current reaches a certain value, the constant current load can be turned off.
  • the circuit avoids excessive loss of energy and improves the working efficiency of the power supply.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

An MOS tube-based constant current circuit, comprising: a constant current load circuit and a control circuit. The control circuit comprises: a first power supply end used for being connected to a circuit to be detected, and a first differential circuit and a first branch circuit respectively connected between an input end and an output end of the first power supply end in parallel. The first branch circuit comprises a second resistor (R2), a second voltage-regulator tube (VD2) and a triode (VT1), wherein an input end of the second resistor is connected to the output end of the first power supply end; an output end of the second resistor is connected to an input end of the second voltage-regulator tube; an output end of the second voltage-regulator tube is connected to a base electrode of the triode; and an emitter electrode of the triode is connected to the input end of the first power supply end. The constant current load circuit comprises: a second power supply end used for being connected to an external power supply, and a second differential circuit, a second branch circuit and a third branch circuit respectively connected to the second power supply end in parallel. The second branch circuit comprises: a fourth resistor (R4), an MOS tube (VT2) and a sixth resistor (R6), wherein an output end of the fourth resistor is connected to a drain electrode of the MOS tube, and a source electrode of the MOS tube is connected to an input end of the sixth resistor. The third branch circuit comprises: a third resistor (R3) and a seventh resistor (R7), wherein an input end of the third resistor is connected to an output end of the second power supply end, an input end of the seventh resistor is connected to a gate electrode of the MOS tube and a collector electrode of the triode in parallel, and an output end of the seventh resistor is connected to an input end of the second power supply end. According to the MOS tube-based constant current circuit, by adjusting the configurations of the resistors, the magnitude of a current in the circuit can be controlled, and the current is limited within a required range; and when the current reaches a certain value, the constant current load circuit can be closed, thereby avoiding excessive energy losses, and improving the working efficiency of the power supply.

Description

一种基于MOS管的恒流电路A constant current circuit based on MOS tube 技术领域Technical field
本发明实施例涉及但不限于电源负载控制领域，尤其涉及一种基于MOS管的恒流电路。Embodiments of the present invention relate to, but are not limited to, the field of power supply load control, and in particular, to a constant current circuit based on a MOS tube.
背景技术Background technique
在相关技术中，电源的固定负载电路中，多采用较大功率的定值电阻，然而大功率电阻本身消耗热能较多，会造成较多的能量的损耗，且不利于电源内部散热，影响电源的安全性能。In the related art, in a fixed load circuit of a power source, a large-power fixed-value resistor is often used. However, the high-power resistor itself consumes more heat energy, which causes more energy loss, and is not conducive to internal heat dissipation of the power supply, affecting the power supply. Security performance.
发明内容Summary of the invention
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.
本发明实施例提供了一种基于MOS管的恒流电路，能够克服电源负载电路中大功率电阻造成能量损耗的较多的问题。The embodiment of the invention provides a constant current circuit based on a MOS tube, which can overcome more problems of energy loss caused by high power resistance in the power load circuit.
本发明实施例提供了一种基于MOS管的恒流电路，包括：恒流负载电路和控制电路，其中，The embodiment of the invention provides a constant current circuit based on a MOS tube, comprising: a constant current load circuit and a control circuit, wherein
控制电路包括：设置为与待测电路连接的第一电源端，分别并联在第一电源端的输入端与输出端之间的第一微分电路和第一支路；第一支路包括第二电阻、第二稳压管以及三极管，第二电阻的输入端与第一电源端的输出端连接，第二电阻的输出端与第二稳压管的输入端连接，第二稳压管的输出端与三极管的基极连接，三极管的发射极与第一电源端的输入端连接；The control circuit includes: a first power supply terminal connected to the circuit to be tested, and a first differential circuit and a first branch respectively connected between the input end and the output end of the first power supply end; the first branch includes a second resistor a second voltage regulator tube and a triode tube, the input end of the second resistor is connected to the output end of the first power source end, the output end of the second resistor is connected to the input end of the second voltage regulator tube, and the output end of the second voltage regulator tube is The base of the triode is connected, and the emitter of the triode is connected to the input end of the first power terminal;
恒流负载电路包括：设置为与外界电源连接的第二电源端，分别与第二电源端并联的第二微分电路、第二支路与第三支路；第二支路包括：第四电阻、MOS管以及第六电阻，第四电阻的输入端与第二电源端的输出端连接，第四电阻的输出端与MOS管的漏极连接，MOS管的源极与第六电阻的输入端连接，第六电阻的输出端与第二电源端的输入端连接； The constant current load circuit includes: a second power supply terminal connected to the external power source, a second differential circuit, a second branch and a third branch respectively connected in parallel with the second power supply end; and the second branch includes: a fourth resistor a MOS transistor and a sixth resistor, wherein the input end of the fourth resistor is connected to the output end of the second power supply terminal, the output end of the fourth resistor is connected to the drain of the MOS transistor, and the source of the MOS transistor is connected to the input end of the sixth resistor The output end of the sixth resistor is connected to the input end of the second power terminal;
第三支路包括：第三电阻和第七电阻，其中，第三电阻的输入端与第二电源端的输出端连接，第三电阻的输出端与第七电阻的输入端连接，且第七电阻的输入端与MOS管的栅极、三极管的集电极并联，第七电阻的输出端与第二电源端的输入端连接；第七电阻的两端并联有第一稳压管。The third branch includes: a third resistor and a seventh resistor, wherein the input end of the third resistor is connected to the output end of the second power terminal, the output end of the third resistor is connected to the input end of the seventh resistor, and the seventh resistor The input end is connected in parallel with the gate of the MOS tube and the collector of the triode, and the output end of the seventh resistor is connected to the input end of the second power terminal; the first voltage regulator is connected in parallel with both ends of the seventh resistor.
可选地，三极管为NPN型三极管。Optionally, the triode is an NPN type triode.
可选地，MOS管为N通道型MOS管。Optionally, the MOS transistor is an N-channel type MOS transistor.
可选地，第一微分电路由第一电容与第一电阻并联而成，第一电容的输入端与第一电阻的输入端分别与第一电源端的输出端连接，第一电容的输出端与第一电阻的输出端分别与第一电源端的输入端连接。Optionally, the first differential circuit is formed by connecting the first capacitor and the first resistor in parallel, and the input end of the first capacitor and the input end of the first resistor are respectively connected to the output end of the first power terminal, and the output end of the first capacitor is The output ends of the first resistors are respectively connected to the input terminals of the first power supply terminal.
可选地，第二微分电路由第二电容与第五电阻并联而成，第二电容的输入端与第五电阻输入端分别与第二电源的输出端连接，第二电容的输出端与第五电阻的输出端分别与第二电源端的输入端连接。Optionally, the second differential circuit is formed by the second capacitor and the fifth resistor being connected in parallel, and the input end of the second capacitor and the fifth resistor input are respectively connected to the output end of the second power source, and the output end of the second capacitor is The output terminals of the five resistors are respectively connected to the input terminals of the second power source.
可选地，第一电源端为电流采集电路，电流采集电路由电流互感器和第一整流器组成；电流互感器的输入端设置为与待测电路连接，电流互感器的输出端与第一整流器的输入端连接，第一整流器的输出端与第一微分电路并联。Optionally, the first power terminal is a current collecting circuit, and the current collecting circuit is composed of a current transformer and a first rectifier; the input end of the current transformer is set to be connected with the circuit to be tested, the output end of the current transformer and the first rectifier The input is connected, and the output of the first rectifier is connected in parallel with the first differentiating circuit.
可选地，第一整流器为桥式整流器。Optionally, the first rectifier is a bridge rectifier.
可选地，第一整流器的整流元件为二极管。Optionally, the rectifying element of the first rectifier is a diode.
可选地，第一电源端为设有电流监控芯片的电流监控电路。Optionally, the first power terminal is a current monitoring circuit provided with a current monitoring chip.
可选地，第二电源端包括：变压器和第二整流器。Optionally, the second power terminal comprises: a transformer and a second rectifier.
可选地，第二电源端与所述变压器的初级连接。Optionally, the second power terminal is connected to the primary of the transformer.
可选地，变压器设有为负载绕组的变压器，第二电源端并联在负载绕组上。Optionally, the transformer is provided with a transformer that is a load winding, and the second power terminal is connected in parallel to the load winding.
可选地，第二整流器为桥式整流器。Optionally, the second rectifier is a bridge rectifier.
可选地，第二整流器的整流元件为二极管。Optionally, the rectifying element of the second rectifier is a diode.
本发明实施例提供的基于MOS管的恒流电路，通过调整电阻的配置，可 控制电路中电流的大小，将电流限制在所需范围之内；当电流达到一定值时，可关闭恒流负载电路，避免造成能量的过多损耗，提升电源的工作效率。The MOS tube-based constant current circuit provided by the embodiment of the invention can adjust the configuration of the resistor The current in the control circuit limits the current to the required range; when the current reaches a certain value, the constant current load circuit can be turned off to avoid excessive energy loss and improve the working efficiency of the power supply.
在阅读并理解了附图和详细描述后，可以明白其他方面。Other aspects will be apparent upon reading and understanding the drawings and detailed description.
附图概述BRIEF abstract
图1为本发明实施例所述的基于MOS管的恒流电路的电路连接示意图；1 is a schematic circuit diagram of a MOS tube-based constant current circuit according to an embodiment of the present invention;
图2为本发明实施例所述的与变压器的初级连接的第二电源端的电路连接示意图；2 is a schematic diagram of circuit connection of a second power terminal connected to a primary of a transformer according to an embodiment of the present invention;
图3为本发明实施例所述的设有负载绕组的变压器的第二电源端的电路连接示意图。FIG. 3 is a schematic diagram of circuit connection of a second power terminal of a transformer provided with a load winding according to an embodiment of the invention.
附图标记说明：Description of the reference signs:
R1、第一电阻；R2、第二电阻；R3、第三电阻；R4、第四电阻；R5、第五电阻；R6、第六电阻；R7、第七电阻；VD1、第一稳压管；VD2、第二稳压管；VT1、三极管；VT2、MOS管；C1、第一电容；C2、第二电容；T1、电流互感器；T2、变压器；D1、第一整流器；D2、第二整流器。R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; VD1, first voltage regulator; VD2, second voltage regulator; VT1, triode; VT2, MOS tube; C1, first capacitor; C2, second capacitor; T1, current transformer; T2, transformer; D1, first rectifier; D2, second rectifier .
本发明的实施方式Embodiments of the invention
下面将结合附图对本发明实施例进行详细描述。The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
参见图1，本实施例提供了一种基于MOS管的恒流电路，包括：恒流负载电路和控制电路，其中，Referring to FIG. 1, the embodiment provides a constant current circuit based on a MOS tube, including: a constant current load circuit and a control circuit, wherein
控制电路包括：设置为与待测电路连接的第一电源端，分别并联在所述第一电源端的输入端与输出端之间的第一微分电路和第一支路；其中，第一电源端为设有电流监控芯片的电源监控电路或电流采集电路；电流监控电路可将待测电路的电流传输给第一微分电路和第一支路；电流采集电路由电流互感器T1和第一整流器D1组成，其中，第一整流器D1为桥式整流器，第一整流器D1的整流元件为二极管，电流互感器T1将采集到的电流转换为电压，传输给第一整流器D1，第一整流器D1将交流电转换为直流电。The control circuit includes: a first power supply terminal connected to the circuit to be tested, and a first differential circuit and a first branch respectively connected between the input end and the output end of the first power supply end; wherein, the first power supply end The power monitoring circuit or the current collecting circuit is provided with a current monitoring chip; the current monitoring circuit can transmit the current of the circuit to be tested to the first differential circuit and the first branch; the current collecting circuit is composed of the current transformer T1 and the first rectifier D1 The first rectifier D1 is a bridge rectifier, and the rectifying component of the first rectifier D1 is a diode. The current transformer T1 converts the collected current into a voltage and transmits it to the first rectifier D1, and the first rectifier D1 converts the alternating current. It is DC.
可选地，第一微分电路由第一电容C1与第一电阻R1并联而成，第一电 容C1的输入端与第一电阻R1的输入端分别与第一电源端的输出端连接，第一电容C1的输出端与第一电阻R1的输出端分别与第一电源端的输入端连接，第一电源端提供的电压经过第一微分电路的滤波，传输给第一支路。Optionally, the first differential circuit is formed by the first capacitor C1 being connected in parallel with the first resistor R1, and the first The input end of the capacitor C1 and the input end of the first resistor R1 are respectively connected to the output end of the first power terminal, and the output end of the first capacitor C1 and the output end of the first resistor R1 are respectively connected to the input end of the first power terminal, first The voltage supplied from the power supply is filtered by the first differential circuit and transmitted to the first branch.
第一支路包括第二电阻R2、第二稳压管VD2以及三极管VT1，第二电阻R2的输入端与第一电源端的输出端连接，第二电阻R2的输出端与第二稳压管VD2的输入端连接，第二稳压管VD2的输出端与三极管VT1的基极连接，三极管VT1的发射极与第一电源端的输入端连接；可选地，三极管VT1为NPN型三极管。The first branch includes a second resistor R2, a second Zener diode VD2, and a transistor VT1. The input end of the second resistor R2 is connected to the output end of the first power terminal, and the output end of the second resistor R2 is connected to the second Zener diode VD2. The input end is connected, the output end of the second Zener diode VD2 is connected to the base of the triode VT1, and the emitter of the triode VT1 is connected to the input end of the first power supply terminal; optionally, the triode VT1 is an NPN type triode.
恒流负载电路包括：设置为与外界电源连接的第二电源端，并列在第二电源端输入端与输出端之间的第二微分电路、第二支路与第三支路；可选地，第二电源端包括变压器T2和第二整流器D2；The constant current load circuit includes: a second power supply terminal connected to the external power source, and a second differential circuit, a second branch and a third branch between the input end and the output end of the second power supply terminal; optionally The second power terminal includes a transformer T2 and a second rectifier D2;
参见图2，第二电源端可与变压器T2的初级连接，从变压器T2的初级取电；参见图3，变压器T2可为设有负载绕组的变压器，第二电源端可以并联在负载绕组上；第二整流器D2为桥式整流器，第二整流器D2的整流元件为二极管。Referring to FIG. 2, the second power terminal can be connected to the primary of the transformer T2 to take power from the primary of the transformer T2; see FIG. 3, the transformer T2 can be a transformer with a load winding, and the second power terminal can be connected in parallel to the load winding; The second rectifier D2 is a bridge rectifier, and the rectifying element of the second rectifier D2 is a diode.
继续参见图1，第二微分电路由第二电容C2与第五电阻R5并联而成，第二电容C2的输入端与第五电阻R5输入端分别与第二电源的输出端连接，第二电容C2的输出端与第五电阻R5的输出端分别与第二电源端的输入端连接。Referring to FIG. 1 , the second differential circuit is formed by the second capacitor C2 and the fifth resistor R5 being connected in parallel. The input end of the second capacitor C2 and the input end of the fifth resistor R5 are respectively connected to the output end of the second power source, and the second capacitor is connected. The output end of C2 and the output end of the fifth resistor R5 are respectively connected to the input end of the second power supply end.
第二支路包括：第四电阻R4、MOS管VT2以及第六电阻R6，第四电阻R4的输入端与第二电源端的输出端连接，第四电阻R4的输出端与MOS管VT2的漏极连接，MOS管VT2的源极与第六电阻R6的输入端连接，第六电阻R6的输出端与第二电源端的输入端连接；可选地，MOS管VT2为N通道型MOS管。The second branch includes: a fourth resistor R4, a MOS transistor VT2, and a sixth resistor R6. The input end of the fourth resistor R4 is connected to the output end of the second power terminal, and the output terminal of the fourth resistor R4 and the drain of the MOS transistor VT2 Connected, the source of the MOS transistor VT2 is connected to the input end of the sixth resistor R6, and the output end of the sixth resistor R6 is connected to the input end of the second power supply terminal; alternatively, the MOS transistor VT2 is an N-channel type MOS transistor.
第三支路包括：第三电阻R3和第七电阻R7，其中，第三电阻R3的输入端与第二电源端的输出端连接，第三电阻R3的输出端与第七电阻R7的输入端连接，且第七电阻R7的输入端与MOS管VT2的栅极、三极管VT1的集电极并联，第七电阻R7的输出端与第二电源端的输入端连接；第七电阻R7的两端并联有第一稳压管VD1。 The third branch includes: a third resistor R3 and a seventh resistor R7, wherein the input end of the third resistor R3 is connected to the output end of the second power terminal, and the output end of the third resistor R3 is connected to the input end of the seventh resistor R7 The input end of the seventh resistor R7 is connected in parallel with the gate of the MOS transistor VT2 and the collector of the transistor VT1, and the output end of the seventh resistor R7 is connected to the input end of the second power supply terminal; the two ends of the seventh resistor R7 are connected in parallel A Zener tube VD1.
可选地，第三电阻R3和第七电阻R7选用大阻值的贴片电阻，第四电阻R4和第六电阻R6选用阻值相对小的金属膜电阻。Optionally, the third resistor R3 and the seventh resistor R7 are selected from a large resistance chip resistor, and the fourth resistor R4 and the sixth resistor R6 are selected from a metal film resistor having a relatively small resistance value.
当电流采集电路采集到的电流经过第一整流器D1的转换，提供的电压没有达到三级管VT1的门限电压时，三级管VT1处于截止状态；此时，MOS管VT2处于导通状态，第二支路有电流通过；而第三支路由于第三电阻R3和第七电阻R7均为大阻值电阻，其电流非常微小，可忽略不计。When the current collected by the current collecting circuit is converted by the first rectifier D1, and the supplied voltage does not reach the threshold voltage of the three-stage tube VT1, the three-stage tube VT1 is in an off state; at this time, the MOS tube VT2 is in an on state, The two branches have current passing through; and the third branch is a large resistance resistor in the third resistor R3 and the seventh resistor R7, and the current is very small and negligible.
令第二电源端提供的电压为U，MOS管VT2栅极的电压为Ug，MOS管VT2栅极与源极之间的电压为Ugs，MOS管VT2的门限电压为Ugs(th)，恒流负载电路的功率为P，电流为I，电流最大值为Ia，则有Let the voltage supplied by the second power supply terminal be U, the voltage of the gate of MOS transistor VT2 be U g , the voltage between the gate and the source of MOS transistor VT2 be U gs , and the threshold voltage of MOS transistor VT2 be U gs(th) The power of the constant current load circuit is P, the current is I, and the current maximum is I a , then there is
Figure PCTCN2015088156-appb-000001
Figure PCTCN2015088156-appb-000001
Ug＝Ugs+I×R6 U g =U gs +I×R 6
则有恒流负载电路的电流I：Then there is a current I of the constant current load circuit:
Figure PCTCN2015088156-appb-000002
Figure PCTCN2015088156-appb-000002
则有恒流负载电路的功率P：Then there is the power P of the constant current load circuit:
P＝U×IP=U×I
则有恒流负载电路的电流I：Then there is a current I of the constant current load circuit:
Figure PCTCN2015088156-appb-000003
Figure PCTCN2015088156-appb-000003
那么恒流负载电路中的电流I可通过第三电阻R3和第七电阻R7来调节，电流最大值Ia为：Then the current I in the constant current load circuit can be adjusted by the third resistor R3 and the seventh resistor R7, and the current maximum value I a is:
Figure PCTCN2015088156-appb-000004
Figure PCTCN2015088156-appb-000004
当电流采集电路采集到的电流经过第一整流器D1的转换，提供的电压有达到三级管VT1的门限电压时，三级管VT1处于导通状态，此时三级管VT1的集电极向MOS管VT2栅极提供电压，MOS管VT2关闭，第二支路中无电流通过，恒流负载电路关闭，减少了能量的损耗，提升了电源的效率。 When the current collected by the current collecting circuit is converted by the first rectifier D1, and the supplied voltage reaches the threshold voltage of the three-stage tube VT1, the three-stage tube VT1 is in an on state, and the collector of the three-stage tube VT1 is turned to the MOS. The VT2 gate provides voltage, the MOS transistor VT2 is turned off, no current flows through the second branch, and the constant current load circuit is turned off, which reduces energy loss and improves the efficiency of the power supply.
工业实用性Industrial applicability
本发明实施例提供的基于MOS管的恒流电路，通过调整电阻的配置，可控制电路中电流的大小，将电流限制在所需范围之内；当电流达到一定值时，可关闭恒流负载电路，避免造成能量的过多损耗，提升电源的工作效率。 The MOS tube-based constant current circuit provided by the embodiment of the invention can control the current in the circuit by adjusting the configuration of the resistor to limit the current within the required range; when the current reaches a certain value, the constant current load can be turned off. The circuit avoids excessive loss of energy and improves the working efficiency of the power supply.

Claims (14)

  1. 一种基于MOS管的恒流电路，包括：恒流负载电路和控制电路，其中，A constant current circuit based on a MOS tube, comprising: a constant current load circuit and a control circuit, wherein
    所述控制电路包括：设置为与待测电路连接的第一电源端，分别并联在所述第一电源端的输入端与输出端之间的第一微分电路和第一支路；所述第一支路包括第二电阻(R2)、第二稳压管(VD2)以及三极管(VT1)，所述第二电阻(R2)的输入端与所述第一电源端的输出端连接，所述第二电阻(R2)的输出端与所述第二稳压管(VD2)的输入端连接，所述第二稳压管(VD2)的输出端与所述三极管(VT1)的基极连接，所述三极管(VT1)的发射极与所述第一电源端的输入端连接；The control circuit includes: a first power supply terminal connected to the circuit to be tested, and a first differential circuit and a first branch respectively connected between the input end and the output end of the first power supply end; The branch includes a second resistor (R2), a second Zener diode (VD2), and a triode (VT1), and an input end of the second resistor (R2) is connected to an output end of the first power terminal, the second An output end of the resistor (R2) is connected to an input end of the second Zener diode (VD2), and an output end of the second Zener diode (VD2) is connected to a base of the triode (VT1), An emitter of the triode (VT1) is connected to an input end of the first power terminal;
    所述恒流负载电路包括：设置为与外界电源连接的第二电源端，分别与所述第二电源端并联的第二微分电路、第二支路与第三支路；所述第二支路包括：第四电阻(R4)、MOS管(VT2)以及第六电阻(R6)，所述第四电阻(R4)的输入端与所述第二电源端的输出端连接，所述第四电阻(R4)的输出端与所述MOS管(VT2)的漏极连接，所述MOS管(VT2)的源极与所述第六电阻(R6)的输入端连接，所述第六电阻(R6)的输出端与所述第二电源端的输入端连接；The constant current load circuit includes: a second power supply terminal that is connected to an external power source, a second differential circuit, a second branch, and a third branch that are respectively connected in parallel with the second power supply terminal; the second branch The circuit includes: a fourth resistor (R4), a MOS transistor (VT2), and a sixth resistor (R6), wherein an input end of the fourth resistor (R4) is connected to an output end of the second power terminal, and the fourth resistor An output end of (R4) is connected to a drain of the MOS transistor (VT2), a source of the MOS transistor (VT2) is connected to an input end of the sixth resistor (R6), and the sixth resistor (R6) The output end is connected to the input end of the second power terminal;
    所述第三支路包括：第三电阻(R3)和第七电阻(R7)，其中，所述第三电阻(R3)的输入端与所述第二电源端的输出端连接，所述第三电阻(R3)的输出端与所述第七电阻(R7)的输入端连接，且所述第七电阻(R7)的输入端与所述MOS管(VT2)的栅极、所述三极管(VT1)的集电极并联，所述第七电阻(R7)的输出端与所述第二电源端的输入端连接；所述第七电阻(R7)的两端并联有第一稳压管(VD1)。The third branch includes: a third resistor (R3) and a seventh resistor (R7), wherein an input end of the third resistor (R3) is connected to an output end of the second power terminal, and the third An output end of the resistor (R3) is connected to an input end of the seventh resistor (R7), and an input end of the seventh resistor (R7) is connected to a gate of the MOS transistor (VT2), and the triode (VT1) The collector of the seventh resistor (R7) is connected to the input end of the second power supply terminal; the first voltage regulator tube (VD1) is connected in parallel with the two ends of the seventh resistor (R7).
  2. 如权利要求1所述的基于MOS管的恒流电路，其中，所述三极管(VT1)为NPN型三极管。The MOS tube-based constant current circuit according to claim 1, wherein said triode (VT1) is an NPN type triode.
  3. 如权利要求1所述的基于MOS管的恒流电路，其中，所述MOS管(VT2)为N通道型MOS管。The MOS tube-based constant current circuit according to claim 1, wherein said MOS transistor (VT2) is an N-channel type MOS transistor.
  4. 如权利要求1所述的基于MOS管的恒流电路，其中，所述第一微分电路由第一电容(C1)与第一电阻(R1)并联而成，所述第一电容(C1)的 输入端与第一电阻(R1)的输入端分别与所述第一电源端的输出端连接，所述第一电容(C1)的输出端与第一电阻(R1)的输出端分别与所述第一电源端的输入端连接。The MOS tube-based constant current circuit according to claim 1, wherein said first differential circuit is formed by a first capacitor (C1) connected in parallel with a first resistor (R1), said first capacitor (C1) The input end and the input end of the first resistor (R1) are respectively connected to the output end of the first power supply end, and the output end of the first capacitor (C1) and the output end of the first resistor (R1) respectively and the first end The input of a power supply is connected.
  5. 如权利要求1所述的基于MOS管的恒流电路，其中，所述第二微分电路由第二电容(C2)与第五电阻(R5)并联而成，所述第二电容(C2)的输入端与第五电阻(R5)输入端分别与所述第二电源的输出端连接，所述第二电容(C2)的输出端与第五电阻(R5)的输出端分别与所述第二电源端的输入端连接。The MOS tube-based constant current circuit according to claim 1, wherein the second differentiating circuit is formed by a second capacitor (C2) and a fifth resistor (R5) connected in parallel, and the second capacitor (C2) The input end and the fifth resistor (R5) input end are respectively connected to the output end of the second power source, and the output end of the second capacitor (C2) and the output end of the fifth resistor (R5) are respectively opposite to the second end The input of the power supply is connected.
  6. 如权利要求1所述的基于MOS管的恒流电路，其中，所述第一电源端为电流采集电路，所述电流采集电路由电流互感器(T1)和第一整流器(D1)组成；所述电流互感器(T1)的输入端设置为与待测电路连接，所述电流互感器(T1)的输出端与所述第一整流器(D1)的输入端连接，所述第一整流器(D1)的输出端与所述第一微分电路并联。The MOS tube-based constant current circuit according to claim 1, wherein the first power supply terminal is a current collecting circuit, and the current collecting circuit is composed of a current transformer (T1) and a first rectifier (D1); The input end of the current transformer (T1) is arranged to be connected to the circuit to be tested, and the output end of the current transformer (T1) is connected to the input end of the first rectifier (D1), the first rectifier (D1) The output of the ) is connected in parallel with the first differentiating circuit.
  7. 如权利要求6所述的基于MOS管的恒流电路，其中，所述第一整流器(D1)为桥式整流器。The MOS tube-based constant current circuit according to claim 6, wherein said first rectifier (D1) is a bridge rectifier.
  8. 如权利要求6所述的基于MOS管的恒流电路，其中，所述第一整流器(D1)的整流元件为二极管。The MOS tube-based constant current circuit according to claim 6, wherein the rectifying element of the first rectifier (D1) is a diode.
  9. 如权利要求1所述的基于MOS管的恒流电路，其中，所述第一电源端为设有电流监控芯片的电流监控电路。The MOS tube-based constant current circuit according to claim 1, wherein said first power supply terminal is a current monitoring circuit provided with a current monitoring chip.
  10. 如权利要求1所述的基于MOS管的恒流电路，其中，所述第二电源端包括：变压器(T2)和第二整流器(D2)。The MOS tube-based constant current circuit according to claim 1, wherein said second power supply terminal comprises: a transformer (T2) and a second rectifier (D2).
  11. 如权利要求10所述的基于MOS管的恒流电路，其中，所述第二电源端与所述变压器(T2)的初级连接。A MOS tube-based constant current circuit according to claim 10, wherein said second power supply terminal is connected to a primary of said transformer (T2).
  12. 如权利要求10所述的基于MOS管的恒流电路，其中，所述变压器(T2)为设有负载绕组的变压器，所述第二电源端并联在所述负载绕组上。A MOS tube-based constant current circuit according to claim 10, wherein said transformer (T2) is a transformer provided with a load winding, and said second power supply terminal is connected in parallel to said load winding.
  13. 如权利要求10所述的基于MOS管的恒流电路，其中，所述第二整流器(D2)为桥式整流器。The MOS tube-based constant current circuit according to claim 10, wherein said second rectifier (D2) is a bridge rectifier.
  14. 如权利要求10所述的基于MOS管的恒流电路，其中，所述第二整流器(D2)的整流元件为二极管。 The MOS tube-based constant current circuit according to claim 10, wherein the rectifying element of said second rectifier (D2) is a diode.
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CN112271923A (en) * 2020-10-28 2021-01-26 中山市柏科电源有限公司 Linear constant current and constant voltage circuit

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