CN105529972A - Detection circuit for intermediate-frequency low current - Google Patents

Detection circuit for intermediate-frequency low current Download PDF

Info

Publication number
CN105529972A
CN105529972A CN201610100483.1A CN201610100483A CN105529972A CN 105529972 A CN105529972 A CN 105529972A CN 201610100483 A CN201610100483 A CN 201610100483A CN 105529972 A CN105529972 A CN 105529972A
Authority
CN
China
Prior art keywords
connected
pin
inverter bridge
phase inverter
detection circuit
Prior art date
Application number
CN201610100483.1A
Other languages
Chinese (zh)
Inventor
魏振
傅隽
赵武玲
Original Assignee
核工业理化工程研究院
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 核工业理化工程研究院 filed Critical 核工业理化工程研究院
Priority to CN201610100483.1A priority Critical patent/CN105529972A/en
Publication of CN105529972A publication Critical patent/CN105529972A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices

Abstract

The present invention discloses a detection circuit for an intermediate-frequency low current, comprising a DC (Direct Current) power supply, wherein a positive terminal of the DC power supply is connected with a pin 1 of a Buck converter; a negative terminal of the DC power supply is connected with a pin 2 of the Buck converter; a pin 3 of the Buck converter is connected with the pin 1 of a three-phase inverter bridge; a pin 4 of the Buck converter is connected with one end of a current detection resistor; the other end of the current detection resistor is connected with the pin 2 of the three-phase inverter bridge; a pin 3 of the three-phase inverter bridge is connected with an A-phase winding of a brushless DC motor; a pin 4 of the three-phase inverter bridge is connected with a B-phase winding of the brushless DC motor; a pin 5 of the three-phase inverter bridge is connected with a C-phase winding of the brushless DC motor; and the current detection circuit outputs an acquired voltage signal to a DSP (Digital Signal Processor) control board. The current detection circuit of the present invention is high in measurement accuracy, can accurately measure the intermediate-frequency low current of the brushless DC motor, is low in manufacturing cost, and can greatly reduce development cost.

Description

中频小电流的检测电路 IF low current detection circuit

技术领域 FIELD

[0001 ]本发明属于一种检测电路,具体涉及一种中频小电流的检测电路。 [0001] The present invention belongs to a detecting circuit, particularly relates to an intermediate frequency detection circuit for small current.

背景技术 Background technique

[0002]高速无刷直流电机由于结构特殊,其相电流非常小,最大不超过1A,同时相电流频率正比于电机转速,由于直流电机转速较高,电机相电流频率变化范围为0-2000HZ,因此直流电机的相电流为中频小电流,必须采用测量范围小、精度较高的电流传感器进行测量。 [0002] High speed brushless DC motor due to the special structure, a phase current which is very small, not more than the maximum. 1A, while the phase current frequency proportional to the motor speed, DC motor due to the high speed, the motor phase current frequency range of 0-2000HZ, Thus DC motor phase current low current intermediate frequency, must be small measuring range and high precision current sensor measurement.

发明内容 SUMMARY

[0003]本发明为解决现有技术存在的问题而提出,其目的是提供一种中频小电流的检测电路。 [0003] The present invention is to solve the problems of the prior art, and has an object to provide a low current intermediate frequency detection circuit.

[0004]本发明的技术方案是:一种中频小电流的检测电路,包括直流电源,直流电源的正端与Buck变换器的I脚连接,直流电源的负端与Buck变换器的2脚连接,Buck变换器的3脚与三相逆变桥的I脚连接,Buck变换器的4脚与电流检测电阻的一端连接,电流检测电阻的另一端与三相逆变桥的2脚连接,三相逆变桥的3脚与无刷直流电机的A相绕组连接、三相逆变桥的4脚与无刷直流电机的B相绕组连接,三相逆变桥的5脚与无刷直流电机的C相绕组连接,电流检测电路将采集的电压信号输出到DSP控制板中,DSP控制板分别与Buck变换器、电流检测电路、三相逆变桥、无刷直流电机相连。 [0004] aspect of the present invention is: A low current intermediate frequency detection circuit, the positive terminal pin 2 includes a DC power supply, DC power supply pin connected to the I Buck converter, the negative terminal of the DC power supply is connected to Buck converter , pin 3 connected to pin the I Buck converter with three-phase inverter bridge, Buck converter 4 is connected to the foot end of the current sensing resistor, a current detection resistor connected to pin 2 of the other end of the three-phase inverter bridge, tris a 3 foot brushless DC motor with phase winding phase inverter bridge connected to pin 4 of the brushless DC motor with three-phase inverter bridge B-phase winding is connected to pin 5 of the three-phase inverter bridge brushless DC motor C-phase output winding connected to the current detection circuit acquired the voltage signal to the DSP control board, the control board DSP Buck converter are connected to the current detection circuit, a three-phase inverter bridge, a brushless DC motor.

[0005] 所述的Buck变换器由+50V直流电源、可控硅T1、二极管D3、滤波电感组以及滤波电容组组成,可控硅Tl的PWM驱动信号由外部输入,电阻R6、电容C5、二极管D3组成R⑶吸收电路,用于吸收可控硅Tl两端的高频信号,以降低可控硅Tl的开关损耗。 Buck converter [0005] The DC power from the + 50V, Tl thyristor, a diode D3, a filter inductor and a filter capacitor group the group consisting of thyristor Tl PWM drive signal from the external input resistor R6, capacitor C5, R⑶ absorbing circuit consisting of diode D3, Tl for absorbing high frequency signals across the SCR, to reduce switching losses in the thyristor Tl.

[0006 ]所述的三相逆变桥中包括三个桥臂的六个可控硅Ql -Q6,三相逆变桥的I脚、2脚并行连接于串联后的可控硅Ql、可控硅Q2,串联后的可控硅Q3、可控硅Q4,串联后的可控硅Q5、可控硅Q6,三相逆变桥的3脚与可控硅Ql、可控硅Q2的连线中点处相接,三相逆变桥的4脚与可控硅Q3、可控硅Q4的连线中点处相接,三相逆变桥的5脚与可控硅Q5、可控硅Q6的连线中点处相接。 [0006] The three-phase inverter bridge including six thyristors Ql -Q6 three bridge arms, the I-phase inverter bridge legs, two legs connected in parallel to the thyristor Ql series, may thyristor Q2, Q3 SCR in series after the SCR Q4, Q5 after a series SCR, Q6 are SCR, three-phase inverter bridge SCR Ql, and 3 feet, even SCR Q2 line midpoint phase, 4-phase inverter bridge legs thyristor Q3, meet at the midpoint of SCR, three-phase inverter bridge 5 feet thyristor Q5 Q4 and controllable contact at the midpoint of the silicon Q6.

[0007]所述的电流检测电路包括运算放大器,运算放大器的2脚通过电阻Rl与FKDL端口连接,运算放大器的3脚通过电阻R2与GND端口连接,通过电阻R4与AGND连接,电阻R2与AGND之间连接有电容C2,运算放大器的I脚、2脚之间并联有电容Cl、电阻R3,运算放大器的I脚依次与电阻R5、二极管Dl、3.3VA连接,电阻R5、二极管Dl之间设置有相互并联的电容C3、电容C4、二极管D2,电容C3、电容C4、二极管D2的另一端与AGND连接。 The current detection circuit [0007] The operational amplifier comprises, connected to pin 2 of the operational amplifier via a resistor R4 to the resistor Rl to the AGND by FKDL port connected to pin 3 of the operational amplifier via a resistor R2 to GND port, resistor R2 and AGND a capacitor connected between the C2, an operational amplifier I foot, 2 feet between parallel capacitance Cl, the resistor R3, an operational amplifier I and foot sequentially resistor R5, a diode Dl, 3.3VA connected resistor R5, a diode Dl is provided between the connected in parallel with a capacitor C3, capacitor C4, diode D2, capacitor C3, capacitor C4, the diode D2 and the other end connected to AGND.

[0008]运算放大器的4脚与+15VA连接,运算放大器的11脚与-15VA连接。 4 feet [0008] + 15VA operational amplifier is connected to pin 11 of the operational amplifier is connected with -15VA.

[0009]本发明测量精度高,能准确测量无刷直流电机的中频小电流,本发明的电流检测电路造价较低,可大大降低开发成本。 [0009] The present invention, high precision, can accurately measure the small current IF brushless DC motor, the current detection circuit of the present invention, a lower cost, can greatly reduce the development cost.

附图说明 BRIEF DESCRIPTION

[0010]图1是本发明的结构框图; [0010] FIG. 1 is a block diagram of the present invention;

图2是本发明中Buck变换器的电路图图3是本发明中三相逆变桥的内部结构图; FIG 2 is a circuit diagram of the present invention Buck converter 3 is an internal configuration diagram of the present invention, the three-phase inverter bridge;

图4是本发明中电流检测电路的电路图; FIG 4 is a circuit diagram of the present invention, the current detection circuit;

其中: among them:

I直流电源 2 Buck变换器 2 Buck Converter DC power I

3三相逆变桥 4 无刷直流电机 3-phase brushless DC motor inverter bridge 4

5 DSP控制板 6 电流检测电阻 5 DSP board current detection resistor 6

7电流检测电路 8 运算放大器 The current detection circuit 7 an operational amplifier 8

9滤波电感组 10滤波电容组。 9 filter inductor filter pack 10 capacitor bank.

具体实施方式 Detailed ways

[0011]以下,参照附图和实施例对本发明进行详细说明: [0011] Referring to the drawings and embodiments of the present invention in detail:

如图1所示,一种中频小电流的检测电路,包括直流电源1、Buck变换器2、三相逆变桥3、无刷直流电机4、DSP控制板5、电流检测电阻6以及电流检测电路7,直流电源I的正端与Buck变换器2的I脚连接,直流电源I的负端与Buck变换器2的2脚连接,Buck变换器2的3脚与三相逆变桥3的I脚连接,Buck变换器2的4脚与电流检测电阻6的一端连接,电流检测电阻6的另一端与三相逆变桥3的2脚连接,三相逆变桥3的3脚与无刷直流电机4的A相绕组连接、三相逆变桥3的4脚与无刷直流电机4的B相绕组连接,三相逆变桥3的5脚与无刷直流电机4的C相绕组连接,电流检测电路7将采集的电压信号输出到DSP控制板5中,DSP控制板5分别与Buck变换器2、电流检测电路7、三相逆变桥3、无刷直流电机4相连。 As shown a small current IF detection circuit includes a DC power source 1, the Buck converter 2, three-phase inverter bridge, a brushless DC motor 4, DSP control board 5, the current detecting resistor and a current detector 6 1 circuit 7, the positive terminal of the DC power supply I I Buck converter is connected to pin 2, the negative terminal of the DC power source I 2 Buck converter connected to pin 2, pin 3 Buck converter 2 and the 3-phase inverter bridge I-pin connector, the Buck converter 4 feet and a current detection resistor 6 is connected to one end 2, the other end of the current detecting resistor 6 is three-phase inverter bridge connecting pin 2, pin 3 phase inverter bridge 3 with and without 3 brush DC motors a 4-phase winding is connected to pin 4 3-phase inverter bridge brushless DC motor with phase winding connected to B 4, 5-phase inverter bridge brushless DC motor 3 and the pin 4 of the C-phase winding connection, the voltage signal output current detection circuit 7 will be collected to the DSP control board 5, the control board 5, respectively, DSP 2, the current detection circuit 7, the three-phase inverter bridge 3, the brushless DC motor 4 is connected to the Buck converter.

[0012] 如图2所示,所述的Buck变换器2由+50V直流电源、可控硅T1、二极管D3、滤波电感组9以及滤波电容组1组成,可控硅TI的PWM驱动信号由外部输入,电阻R6、电容C5、二极管D3组成RCD吸收电路,用于吸收可控硅Tl两端的高频信号,以降低可控硅Tl的开关损耗。 [0012], the Buck converter according to a + 50V DC power supply 2, the thyristor Tl, the diode D3, the filter inductor and a filter capacitor 9 group consisting of Group 1, the TI thyristor shown in Figure 2 by the PWM drive signal external input, resistor R6, capacitor C5, a diode D3 composition RCD snubber circuit for absorbing a high-frequency signal across the thyristor Tl, to reduce switching losses in the thyristor Tl.

[0013]本发明中Buck变换器2的电路图连接关系如下:+50 V直流电源端口与电阻R6、可控硅TI的集电极、二极管D3的阳极连接,电阻R6的另一端以及二极管D3的阴极与电容C5连接,电容C5的另一端与可控硅TI的发射极连接。 [0013] The present invention is a circuit diagram of connection relationship Buck converter 2 is as follows: cathode +50 V DC power supply port and the resistor R6, the collector of TI thyristor, connected to the anode of the diode D3, the other end of the resistor R6 and a diode D3 connected to the capacitor C5, the other end of the capacitor C5 is connected to the emitter of the thyristor TI. 驱动信号GPffM、EPffM分别与可控硅TI的基极、发射极连接。 Drive signal GPffM, EPffM respectively TI thyristor base, emitter connected. 二极管D4的阳极与GND连接,二极管D4的阴极与可控硅TI的发射极、电容C5的另一端连接。 The anode of diode D4 is connected to GND, and the cathode of diode D4 TI thyristor emitter, the other end of the capacitor C5 is connected. 滤波电感组9由三个电感串联组成,其一端同时与二极管D4的阴极、可控硅TI的发射极、电容C5的另一端连接,另一端与滤波电容组1连接,滤波电容组1由两个电容并联组成,其一端与滤波电感组9连接,另一端与GND连接。 Group 9 of the filter inductor in series three inductors, one end while the cathode of diode D4, TI thyristor emitter, the other end of the capacitor C5 and the other end connected to the filter capacitor group 1, group 1 consists of two filter capacitor capacitors connected in parallel, one end of the filter inductor group 9 and the other end connected to GND.

[0014]如图3所示,所述的三相逆变桥中包括三个桥臂的六个可控硅Q1-Q6,三相逆变桥的I脚、2脚并行连接于串联后的可控硅Ql、可控硅Q2,串联后的可控硅Q3、可控硅Q4,串联后的可控硅Q5、可控硅Q6,三相逆变桥的3脚与可控硅Ql、可控硅Q2的连线中点处相接,三相逆变桥的4脚与可控硅Q3、可控硅Q4的连线中点处相接,三相逆变桥的5脚与可控硅Q5、可控硅Q6的连线中点处相接。 [0014] As shown, the three-phase inverter bridge including six thyristors Q1-Q6, the I-phase inverter bridge leg three bridge arms 3, pin 2 is connected in parallel to the series Ql, SCR, SCR Q2, Q3 SCR in series after the SCR Q4, Q5 after a series SCR, SCR Q6, 3-phase inverter bridge legs SCR Ql, and, SCR Q2 is in contact at the midpoint, the three-phase inverter bridge 4 feet thyristor Q3, Q4 is at the midpoint of the thyristor in contact, with the pin 5 may be a three-phase inverter bridge thyristor Q5, Q6 SCR at the midpoint of the contact.

[0015]本发明中三相逆变桥的结构连接关系如下:三相逆变桥3的I脚与可控硅Ql、可控硅Q3、可控硅Q5的集电极连接,三相逆变桥3的2脚与可控硅Q2、可控硅Q4、可控硅Q6的发射极连接,可控硅Ql的发射极与可控硅Q2的集电极连接,可控硅Q3的发射极与可控硅Q4的集电极连接,可控硅Q5的发射极与可控硅Q6的集电极连接。 [0015] The structure of the present invention, the connection relationship of the three-phase inverter bridge as follows: I-phase inverter bridge with SCR Ql, pin 3, SCR Q3, Q5 is connected to the collector SCR, three-phase inverter 2 and 3 foot bridge SCR Q2, SCR Q4, Q6 emitter connected thyristors, SCR Ql emitter connected to the collector of the thyristor Q2, Q3 and the emitter of the thyristor SCR connected to the collector of Q4, the emitter SCR thyristor Q6 is connected to the collector of Q5. 三相逆变桥3的3脚与可控硅Ql的发射极、可控硅Q2的集电极连接,三相逆变桥3的4脚与可控硅Q3的发射极、可控硅Q4的集电极连接,三相逆变桥3的5脚与可控硅Q5的发射极、可控硅Q6的集电极连接。 3 phase inverter bridge legs 3 and the emitter electrode of the SCR Ql, Q2 is connected to the collector SCR, three-phase inverter bridge 4 and the pin 3 of Q3 emitting thyristor, the thyristor Q4 connected to the collector, 3-phase inverter bridge legs 5 and Q5 is emitting thyristor SCR connected to the collector of Q6.

[0016]如图4所示,所述的电流检测电路7包括运算放大器8,运算放大器8的2脚通过电阻Rl与FKDL端口连接,运算放大器8的3脚通过电阻R2与GND端口连接,通过电阻R4与AGND连接,电阻R2与AGND之间连接有电容C2,运算放大器8的I脚、2脚之间并联有电容Cl、电阻R3,运算放大器8的I脚依次与电阻R5、二极管DU3.3VA连接,电阻R5、二极管Dl之间设置有相互并联的电容C3、电容C4、二极管D2,电容C3、电容C4、二极管D2的另一端与AGND连接。 [0016] As shown, the current detection circuit 7 comprises an operational amplifier 8, the operational amplifier 2 feet 8 GND through a resistor R2 connected to port 4 through a resistor Rl and FKDL port connected to pin 3 of the operational amplifier 8 by resistor R4 and AGND, connecting a capacitor C2, an operational amplifier 8 I foot AGND between resistor R2, a capacitor Cl, a resistor R3, an operational amplifier 8 feet I sequentially with resistor R5, a diode connected in parallel between pin 2 DU3. 3VA connected resistor R5, a capacitor is provided in parallel with each other C3, capacitor C4, diode D2, capacitor C3, capacitor C4, the diode D2 is connected between the other end and AGND diode Dl.

[0017] 其中,电阻Rl连接FKDL端口,电阻Rl另一端与电阻R3、电容Cl以及运算放大器8的2脚相接,电阻R3、电容Cl的另一端则与运算放大器8的I脚连接,电阻R2连接GND端口,电阻R2另一端与电阻R4、电容C2以及运算放大器8的3脚相接,电阻R4、电容C2的另一端与AGND连接,电阻R5与运算放大器8的I脚连接,电阻R5的另一端与电容C3、电容C4、二极管Dl的阳极、二极管D2的阴极连接,电容C3、电容C4的另一端、二极管D2的阳极与AGND连接,二极管DI的阴极与3.3VA连接。 [0017] wherein, the resistance Rl is connected FKDL port, the other end of the resistor Rl and the resistor R3, a capacitor Cl and an operational amplifier 2 of the contact pin 8, the resistor R3, the other terminal of the capacitor Cl is connected to pin I of the operational amplifier 8, resistors R2 GND connection port, the other end of the resistor R2 and the resistor R4, a capacitor C2 and an operational amplifier 8 of the contact pin 3, the resistor R4, the other end of the capacitor C2 is connected AGND, resistor R5 and the operational amplifier 8 is connected to pin I, resistor R5 the other end of the capacitor C3, capacitor C4, the anode of the diode Dl, connected to the cathode of the diode D2, the capacitor C3, the other terminal of the capacitor C4, the anode of diode D2 is connected to the AGND, and the cathode of the diode DI is connected 3.3VA.

[0018]运算放大器8的4脚与+15VA连接,运算放大器8的11脚与-15VA连接。 [0018] The pin 4 of the operational amplifier 8 is connected to the + 15VA, an operational amplifier 11 connected to pin 8 of the -15VA.

[0019]本发明中的DSP控制板5选用TI公司生产的以TMS320F2812芯片为核心的系统控制板。 [0019] In the present invention, the control board 5 use TI DSP produced TMS320F2812 chip as the core to the system control panel.

[0020] 本发明的工作过程如下: [0020] The operation of the present invention is as follows:

中频小电流的检测电路首先将直流电机的相电流通过电流检测电阻转换为电压信号,转换后的电压信号经差分放大器按比例进行调节,差分放大器的输出信号经RC滤波电路滤波后,再将其幅值限制在3.3V内,用于DSP控制板的A/D转换。 IF detection circuit first low current DC motor phase currents by the current detecting resistor into a voltage signal, the converted voltage signal is adjusted in proportion to the differential amplifier, the output signal of the differential amplifier via a RC filter circuit after filtering, which is then amplitude limited to 3.3V, for a DSP board a / D conversion.

[0021 ]本发明测量精度高,能准确测量无刷直流电机的中频小电流,本发明的电流检测电路造价较低,可大大降低开发成本。 [0021] The present invention high precision, can accurately measure the small current IF brushless DC motor, the current detection circuit of the present invention, a lower cost, can greatly reduce the development cost.

Claims (5)

1.一种中频小电流的检测电路,包括直流电源(I),其特征在于:直流电源(I)的正端与Buck变换器(2)的I脚连接,直流电源(I)的负端与Buck变换器(2)的2脚连接,Buck变换器(2 )的3脚与三相逆变桥(3 )的I脚连接,Buck变换器(2 )的4脚与电流检测电阻(6 )的一端连接,电流检测电阻(6 )的另一端与三相逆变桥(3)的2脚连接,三相逆变桥(3)的3脚与无刷直流电机(4)的A相绕组连接、三相逆变桥(3)的4脚与无刷直流电机(4)的B相绕组连接,三相逆变桥(3)的5脚与无刷直流电机(4)的C相绕组连接,电流检测电路(7)将采集的电压信号输出到DSP控制板(5 )中,DSP控制板(5)分别与Buck变换器(2)、电流检测电路(7 )、三相逆变桥(3)、无刷直流电机(4)相连。 A low current intermediate frequency detection circuit including a DC power supply (I), wherein: the positive terminal of a DC power supply (I) and the Buck converter (2) I-pin connector, a DC power supply (I) to the negative terminal (2) is connected to the pin 2 Buck converter, Buck converter (2) with a 3-phase inverter bridge feet (3) I-pin connector, Buck converter (2) a current detecting resistor 4 and the pin (6 ) connected to one end, a current detection resistor (6) and the other end of the three-phase inverter bridge (3) is connected to pin 2, a three-phase inverter bridge (3) is 3 feet and brushless DC motor (4) phase a winding connection, three-phase inverter bridge (3) is 4 feet and brushless DC motor (4) connected to the B-phase winding, three-phase inverter bridge (3) and 5 feet brushless DC motor (4) phase C voltage signal output winding connected to the current detection circuit (7) is collected to the DSP control board (5), DSP control board (5) respectively Buck converter (2), the current detection circuit (7), three-phase inverter bridge (3), the brushless DC motor (4) is connected.
2.根据权利要求1所述的中频小电流的检测电路,其特征在于:所述的Buck变换器(2)由+50V直流电源、可控硅T1、二极管D3、滤波电感组(9 )以及滤波电容组(1 )组成,可控硅Tl的PWM驱动信号由外部输入,电阻R6、电容C5、二极管D3组成RCD吸收电路,用于吸收可控硅Tl两端的高频信号,以降低可控硅Tl的开关损耗。 The low current intermediate frequency detection circuit according to claim 1, wherein: said Buck converter (2) by a + 50V DC power source, thyristor Tl, the diode D3, the filter inductor (9) and filter capacitor group (1), with the thyristor Tl PWM drive signal from the external input resistor R6, capacitor C5, a diode D3 composition RCD snubber circuit for absorbing the high frequency signal Tl across the SCR to reduce controllable Tl silicon switching losses.
3.根据权利要求1所述的中频小电流的检测电路,其特征在于:所述的三相逆变桥(3)中包括三个桥臂的六个可控硅Q1-Q6,三相逆变桥(3)的I脚、2脚并行连接于串联后的可控硅Ql、可控硅Q2,串联后的可控硅Q3、可控硅Q4,串联后的可控硅Q5、可控硅Q6,三相逆变桥(3 )的3脚与可控硅Ql、可控硅Q2的连线中点处相接,三相逆变桥(3 )的4脚与可控硅Q3、可控硅Q4的连线中点处相接,三相逆变桥(3)的5脚与可控硅Q5、可控硅Q6的连线中点处相接。 The low current intermediate frequency detection circuit according to claim 1, wherein: said three-phase inverter bridge (3) comprises six thyristors Q1-Q6 three bridge arms, reverse-phase variable bridge (3) I-feet, pin 2 is connected in parallel to the thyristor Ql series SCR Q2, Q3 SCR in series after the SCR Q4, Q5 after a series SCR, controllable Q6 are silicon, a three-phase inverter bridge (3) and 3 feet SCR Ql, midpoint connection, SCR Q2 is connected, three-phase inverter bridge (3) is 4 feet thyristor Q3, SCR Q4 is at the midpoint phase, three-phase inverter bridge (3) is 5 feet thyristor Q5, Q6 SCR in contact at the midpoint.
4.根据权利要求1所述的中频小电流的检测电路,其特征在于:所述的电流检测电路(7)包括运算放大器(8),运算放大器(8)的2脚通过电阻Rl与FKDL端口连接,运算放大器(8)的3脚通过电阻R2与GND端口连接,通过电阻R4与AGND连接,电阻R2与AGND之间连接有电容C2,运算放大器(8)的I脚、2脚之间并联有电容Cl、电阻R3,运算放大器(8)的I脚依次与电阻R5、二极管Dl、3.3VA连接,电阻R5、二极管Dl之间设置有相互并联的电容C3、电容C4、二极管D2,电容C3、电容C4、二极管D2的另一端与AGND连接。 The low current intermediate frequency detection circuit according to claim 1, wherein: said current detection circuit (7) comprises an operational amplifier (8), an operational amplifier (8) of the pin 2 through the resistor Rl and port FKDL connecting the operational amplifier (8) is 3 feet GND through a resistor R2 to the port, via a resistor R4 to AGND, connecting a capacitor C2, an operational amplifier (8) feet I AGND between resistor R2, connected in parallel between pin 2 a capacitor Cl, a resistor R3, an operational amplifier (8) and the I feet sequentially resistor R5, a diode Dl, 3.3VA connection, the resistor R5, connected in parallel is provided with capacitor C3, capacitor C4 between the diode Dl, the diode D2, capacitor C3 , capacitor C4, the diode D2 and the other end connected to AGND.
5.根据权利要求4所述的中频小电流的检测电路,其特征在于:运算放大器(8)的4脚与+15VA连接,运算放大器(8)的11脚与-15VA连接。 The low current intermediate frequency detection circuit as claimed in claim 4, wherein: an operational amplifier (8) is connected to pin 4 and + 15VA, an operational amplifier (8) and pin 11 is connected -15VA.
CN201610100483.1A 2016-02-24 2016-02-24 Detection circuit for intermediate-frequency low current CN105529972A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610100483.1A CN105529972A (en) 2016-02-24 2016-02-24 Detection circuit for intermediate-frequency low current

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610100483.1A CN105529972A (en) 2016-02-24 2016-02-24 Detection circuit for intermediate-frequency low current

Publications (1)

Publication Number Publication Date
CN105529972A true CN105529972A (en) 2016-04-27

Family

ID=55772012

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610100483.1A CN105529972A (en) 2016-02-24 2016-02-24 Detection circuit for intermediate-frequency low current

Country Status (1)

Country Link
CN (1) CN105529972A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106771480A (en) * 2016-11-30 2017-05-31 旋智电子科技(上海)有限公司 Induction current detection system and method and inverter driving device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102832833A (en) * 2012-09-24 2012-12-19 核工业理化工程研究院 Alternating current to direct current conversion device of intermediate frequency converter
US20140111131A1 (en) * 2012-10-24 2014-04-24 Marvell World Trade Ltd. Method and apparatus for windowless bemf detection
US20140232311A1 (en) * 2013-02-20 2014-08-21 Microchip Technology Incorporated Method and System for Determining the Position of a Synchronous Motor's Rotor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102832833A (en) * 2012-09-24 2012-12-19 核工业理化工程研究院 Alternating current to direct current conversion device of intermediate frequency converter
US20140111131A1 (en) * 2012-10-24 2014-04-24 Marvell World Trade Ltd. Method and apparatus for windowless bemf detection
US20140232311A1 (en) * 2013-02-20 2014-08-21 Microchip Technology Incorporated Method and System for Determining the Position of a Synchronous Motor's Rotor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
樊平: "无刷直流电机宽范围调速系统研究", 《电力电子技术》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106771480A (en) * 2016-11-30 2017-05-31 旋智电子科技(上海)有限公司 Induction current detection system and method and inverter driving device

Similar Documents

Publication Publication Date Title
CN100521485C (en) LCL filtering based voltage type active rectifier steady control system and method
CN200994112Y (en) Three-phase photovaltaic grid-connected inverter
CN103248255B (en) Tri-phase modular multi-level converter and fault-tolerate detecting method for IGBT (insulated gate bipolar translator) open circuit fault in sub-modules thereof
CN101951716A (en) Constant-on-time primary side constant-current control device for LED driver with high power factor
CN101882799A (en) Control method of alternating voltage sensorless high voltage direct current transmission converter
He et al. A novel control strategy of suppressing DC current injection to the grid for single-phase PV inverter
Stogerer et al. Implementation of a novel control concept for reliable operation of a VIENNA rectifier under heavily unbalanced mains voltage conditions
CN102638043A (en) APF (Active Power Filter)parallel system and control method thereof
CN102739033B (en) Staggered parallel three-phase circuits pfc
CN105515003A (en) Active power filter for detecting harmonic wave and wattless current and detecting method thereof
CN101951168A (en) Alternating current (AC) converter for converting high voltage to low voltage
CN202333930U (en) Totally-digitalized efficient multi-frequency quick charging power supply
CN100530891C (en) Sampling circuit and voltage sampling method for three-level power factor calibration circuit
CN100471016C (en) Three phase rectifying bridge DC side parallel type active electric power filter
Chen et al. Design and control for three-phase grid-connected photovoltaic inverter with LCL filter
CN101877548B (en) A photovoltaic power generation three-phase four-leg inverter and grid-connected PV system
CN102243263A (en) Alternating current value detection and current zero crossing point detection circuit
CN100386938C (en) Unified constant frequency integral controlled 3-phase 4-line active power filter control method
CN102624277B (en) Dead-zone-free three-phase AC/DC converter with high-frequency rectifier bridge
CN2854922Y (en) Single-phase variable frequency constant-current source
CN204103797U (en) Quasi Z source three-level T-type inverter
CN102163927A (en) Multi-level converter employing multi-winding intermediate-high frequency transformer
CN204597799U (en) Three-phase VIENNA rectifier based on 60 coordinate system
CN101938127B (en) Single-phase and three-phase dual buck full-bridge parallel active power filter
CN101833029B (en) Method and circuit for detecting bus voltage of wind power current transformer

Legal Events

Date Code Title Description
C06 Publication
C10 Entry into substantive examination