CN107317635B

CN107317635B - Multi-channel electrooptical signal integrated circuit conversion board

Info

Publication number: CN107317635B
Application number: CN201710578528.0A
Authority: CN
Inventors: 杨璐; 王雷; 李守蓉; 赵艳斌
Original assignee: CRRC Yongji Electric Co Ltd
Current assignee: CRRC Yongji Electric Co Ltd
Priority date: 2017-07-17
Filing date: 2017-07-17
Publication date: 2020-02-11
Anticipated expiration: 2037-07-17
Also published as: CN107317635A

Abstract

The invention relates to an electro-optical signal integrated circuit conversion board, in particular to a multi-channel electro-optical signal integrated circuit conversion board, which solves the problems that the existing signal control integrated circuit board is easily interfered by electromagnetic interference, cannot simultaneously carry out multi-channel control, is asynchronous in transmission, is easy to insert wrong components and has larger volume, and the scheme is as follows: a plurality of pairs of upper and lower bridge arm driving circuits are arranged on the plate body, and each driving circuit comprises an electric-to-optical transmission circuit, an optical-to-electric feedback circuit and a power circuit; the electric signal is converted into an optical signal through an electric signal transmission circuit, and then a driving pulse input signal is transmitted to the driving plate through an optical fiber, so that reliable on and off of the IGBT is ensured; the drive plate state feedback signal is converted into an electric signal through the optical-to-electric feedback circuit and is output to the control unit, so that the real-time state of the IGBT can be accurately monitored. The advantages are that: the multi-channel electro-optical integrated circuit distributes signals, is not easy to be interfered by electromagnetism, has simple layout and saves space; the signal input synchronism is good; the whole structure is compact and the plugging and unplugging are convenient.

Description

Multi-channel electrooptical signal integrated circuit conversion board

Technical Field

The invention relates to an electro-optical signal integrated circuit conversion board, in particular to a multi-channel electro-optical signal integrated circuit conversion board.

Background

In a high-power alternating-current transmission electric locomotive or a high-speed motor train unit, an IGBT power device is a key part for completing function conversion, and the working reliability of the IGBT power device directly influences the working performance of a core part, namely a converter, of the high-power alternating-current transmission electric locomotive or the high-speed motor train unit. However, in the inverter, due to the existence of various high-voltage electric signals and low-voltage signals and the influence of the overall layout of the inverter, the electromagnetic environment is also complicated, which means that the switching signals transmitted to the IGBT by the control system are easily interfered by various electromagnetic environments. As a driving unit for directly controlling and protecting the IGBT, the quality of input and feedback signals plays an important role in controlling and protecting the IGBT. If the input signal is interfered, the IGBT is directly damaged and even exploded; if the feedback signal is interfered, the fault signal cannot be accurately transmitted to the control unit, so that the IGBT cannot be protected in time when a fault occurs. At present, the electromagnetic interference is serious by transmitting the electric signals from the control unit to the power module in a pulse mode, and the problems of time difference, component connection position errors and the like exist when multiple paths of electric signals are transmitted simultaneously. Therefore, it is necessary to design a miniaturized multi-channel electro-optical signal integrated circuit conversion board capable of correctly and reliably transmitting internal signals synchronously without electromagnetic interference and with a function of preventing wrong insertion.

Disclosure of Invention

The invention solves the problems that the existing signal control integrated circuit board is easily interfered by electromagnetic interference, can not carry out multi-path control simultaneously, is asynchronous in transmission, is easy to insert wrong components and parts and has larger volume, and provides the multi-path electro-optical signal integrated circuit conversion board.

The invention is realized by the following technical scheme: the multi-path electro-optical signal integrated circuit conversion board comprises a board body, wherein a plurality of pairs of upper and lower bridge arm driving circuits which are respectively connected with an upper bridge arm and a lower bridge arm of a half-bridge circuit are arranged on the board body, and each upper and lower bridge arm driving circuit comprises an electric signal-to-optical signal transmission circuit, an optical signal-to-electric signal feedback circuit and a power circuit; the electric signal-to-light signal transmission circuit comprises a first resistor, one end of the first resistor is used as an IH input end and connected with an electric signal of an upper bridge arm sent by a system control unit or used as an IB input end and connected with an electric signal of a lower bridge arm sent by the system control unit, the other end of the first resistor is grounded after passing through a first capacitor, the other end of the first resistor is also connected with a cathode of a voltage stabilizing diode, an anode of the voltage stabilizing diode is respectively connected with one end of a second resistor, a cathode of a first diode and an input end of an optical fiber emitter, and the other ends of the second resistor, the anode of the first diode and the rest ends of the optical fiber emitter are all connected with the ground; the optical signal to electrical signal feedback circuit comprises an optical fiber receiver, the input end of the optical fiber receiver is connected with an optical signal source of a state feedback optical signal from an upper bridge arm or a state feedback optical signal from a lower bridge arm, the output end of the optical fiber receiver is connected with one end of a pull-up resistor, the other end of the pull-up resistor is connected with a power circuit, the output end of the optical fiber receiver is also connected with the input end of a Schmitt trigger, the power end of the Schmitt trigger is connected with an external power supply, the power end of the Schmitt trigger is connected with the ground after passing through a second capacitor, the grounding end of the Schmitt trigger is connected with the ground, the output end of the Schmitt trigger is used as the FH end of the optical signal to electrical signal feedback circuit of the upper bridge arm and is transmitted to the system control unit or used as the FB end of the optical signal to electrical signal feedback circuit of the lower bridge arm, the voltage end of the optical fiber receiver is connected with an external power supply, the grounding end of the optical fiber receiver is connected with the ground, and a third capacitor is connected between the voltage end of the optical fiber receiver and the grounding end; the power supply circuit comprises a voltage stabilizing chip, wherein the input end of the voltage stabilizing chip is respectively connected with an external power supply and one end of a fourth capacitor, the output end of the voltage stabilizing chip is respectively connected with the other end of the pull-up resistor, one end of a fifth capacitor and one end of a sixth capacitor, and the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the sixth capacitor and the grounding end of the voltage stabilizing chip are connected with the ground. The upper and lower bridge arm driving circuits are arranged on the integrated circuit conversion board in pairs, so that the problem of synchronous electric signal simultaneous input when a multi-path IGBT parallel circuit is applied is solved. The electro-optical conversion unit circuit is adopted to convert the electric signals into optical signals for transmission, so that the problem that the electric signals are easily subjected to electromagnetic interference in the transmission process is solved. The multi-channel electro-optical signals are integrated together, so that the space is saved, the layout is simplified, and the miniaturization design is facilitated. The differential mode connection method is beneficial to inhibiting common mode interference in a line transmission process, the electric signal is converted into an optical signal through an electric signal-to-optical signal transmission circuit through an optical fiber transmitter, then a driving pulse input signal is transmitted to a driving plate through an optical fiber, and reliable turn-on and turn-off of the IGBT are guaranteed. The transmission of the feedback signal of the driving plate is just opposite to the transmission of the input pulse signal, the state feedback optical signal of the upper bridge arm is converted into an electric signal to be accessed into FH (frequency hopping) through the optical fiber receiver, and the state feedback optical signal of the lower bridge arm of the same bridge arm is converted into an electric signal to be accessed into FB and transmitted out of the FB to the system control unit, so that the system control unit can accurately monitor the real-time state of the IGBT. The input end of the power circuit inputs a certain direct current voltage from an external power supply to be used as a reference power supply of the pull-up resistor, and simultaneously provides the required direct current voltage for the optical fiber receiver through the voltage stabilizing chip.

The invention has the following advantages: 1. signals are distributed by adopting a multi-path electro-optical integrated circuit conversion board, so that the problem of electromagnetic interference is easily caused in the process of transmitting electric signals, the circuit layout is simplified, and the space is saved; 2. the problem that synchronous electric signals are input simultaneously when a multi-path IGBT parallel circuit is applied is solved by adopting a multi-path electro-optical integrated circuit conversion board; 3. the multi-channel electro-optical integrated circuit conversion board is adopted, so that the problem that the low-voltage connector of the power unit is inconvenient to plug and unplug due to compact integral structure and high power density is solved; 4. the number of conversion circuits can be expanded in pairs according to system requirements.

Drawings

FIG. 1 is a schematic diagram of an electrical signal-to-optical signal transmission circuit of an upper bridge arm driving circuit;

FIG. 2 is a schematic diagram of a feedback circuit for converting optical signals into electrical signals of the upper bridge arm driving circuit;

FIG. 3 is a schematic diagram of an electrical signal to optical signal transmission circuit of the lower bridge arm driving circuit;

FIG. 4 is a schematic diagram of a feedback circuit for converting optical signals into electrical signals of the lower bridge arm driving circuit;

FIG. 5 is a schematic diagram of a power supply circuit;

fig. 6 is a schematic diagram of the external structure of the conversion board of the multi-channel electro-optical signal integrated circuit.

Detailed Description

The multi-path electro-optical signal integrated circuit conversion board comprises a board body, wherein a plurality of pairs of upper and lower bridge arm driving circuits which are respectively connected with an upper bridge arm and a lower bridge arm of a half-bridge circuit are arranged on the board body, and each upper and lower bridge arm driving circuit comprises an electric signal-to-optical signal transmission circuit, an optical signal-to-electric signal feedback circuit and a power circuit; the electric signal-to-optical signal transmission circuit comprises a first resistor R1, one end of the first resistor R1 is used as an IH input end and connected with an electric signal of an upper bridge arm sent by a system control unit or used as an IB input end and connected with an electric signal of a lower bridge arm sent by the system control unit, the other end of the first resistor R1 is grounded after passing through a first capacitor C1, the other end of the first resistor R1 is also connected with a cathode of a voltage stabilizing diode D, an anode of the voltage stabilizing diode D is respectively connected with one end of a second resistor R2, a cathode of a first diode D1 and an input end of an optical fiber emitter, and the other ends of the second resistor R2, the anode of the first diode D1 and the rest ends of the optical emitter are all connected with; the optical signal to electrical signal feedback circuit comprises an optical fiber receiver, the input end of the optical fiber receiver is connected with an optical signal source of a state feedback optical signal from an upper bridge arm or a state feedback optical signal from a lower bridge arm, the output end of the optical fiber receiver is connected with one end of a pull-up resistor, the other end of the pull-up resistor is connected with a power circuit, the output end of the optical fiber receiver is also connected with the input end of a Schmitt trigger, the power end of the Schmitt trigger is connected with an external power supply, the power end of the Schmitt trigger is connected with the ground after passing through a second capacitor C2, the grounding end of the Schmitt trigger is connected with the ground, the output end of the Schmitt trigger is used as the FH end of the optical signal to electrical signal feedback circuit of the upper bridge arm and is transmitted to the system control unit or used as the FB end of the optical signal to electrical signal feedback circuit of the lower bridge arm, the voltage end of the optical fiber receiver is connected with an external power supply, the grounding end of the optical fiber receiver is connected with the ground, and a third capacitor C3 is further connected between the voltage end of the optical fiber receiver and the grounding end; the power supply circuit comprises a voltage stabilizing chip, wherein the input end of the voltage stabilizing chip is respectively connected with an external power supply and one end of a fourth capacitor C4, the output end of the voltage stabilizing chip is respectively connected with the other end of a pull-up resistor, one end of a fifth capacitor C5 and one end of a sixth capacitor C6, and the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, the other end of the sixth capacitor C6 and the grounding end of the voltage stabilizing chip are connected with the ground.

When the IGBT driving circuit is installed and used, the IH end is in signal connection with an upper bridge arm control unit of a half-bridge circuit through a low-voltage connector, the IB end is in signal connection with a lower bridge arm control unit of the same bridge arm through the low-voltage connector, an electric signal of the upper bridge arm sent by the control unit is converted into an optical signal through an optical fiber head through an electric signal transmission circuit, then a driving pulse input signal is transmitted to a driving plate through an optical fiber, and reliable on and off of the IGBT are guaranteed. The feedback signal transmission of the driving plate is just opposite to the transmission of the input pulse signal, the state feedback optical signal of the upper bridge arm is connected into the FH through the optical fiber, the state feedback optical signal of the lower bridge arm of the same bridge arm is connected into the FB, and the optical signal is converted into an electric signal through the optical signal feedback circuit and is output to the control unit, so that the control unit can accurately monitor the real-time state of the IGBT. The input end of the power circuit inputs a certain direct current voltage from an external power supply to be used as a reference power supply of the pull-up resistor, and simultaneously provides the required direct current voltage for the optical signal transmission circuit through the voltage stabilizing chip.

Claims

1. A multi-channel electro-optical signal integrated circuit conversion board comprises a board body, and is characterized in that: the plate body is provided with a plurality of pairs of upper and lower bridge arm driving circuits which are respectively connected with an upper bridge arm and a lower bridge arm of a half-bridge circuit, and each upper and lower bridge arm driving circuit comprises an electric signal-to-optical signal transmission circuit, an optical signal-to-electric signal feedback circuit and a power circuit; the electric signal-to-optical signal transmission circuit comprises a first resistor R1, one end of the first resistor R1 is used as an IH input end and connected with an electric signal of an upper bridge arm sent by a system control unit or used as an IB input end and connected with an electric signal of a lower bridge arm sent by the system control unit, the other end of the first resistor R1 is grounded after passing through a first capacitor C1, the other end of the first resistor R1 is also connected with a cathode of a voltage stabilizing diode D, an anode of the voltage stabilizing diode D is respectively connected with one end of a second resistor R2, a cathode of a first diode D1 and an input end of an optical fiber emitter, and the other ends of the second resistor R2, the anode of the first diode D1 and the rest ends of the optical emitter are all connected with; the optical signal to electrical signal feedback circuit comprises an optical fiber receiver, the input end of the optical fiber receiver is connected with an optical signal source of a state feedback optical signal from an upper bridge arm or a state feedback optical signal from a lower bridge arm, the output end of the optical fiber receiver is connected with one end of a pull-up resistor, the other end of the pull-up resistor is connected with a power circuit, the output end of the optical fiber receiver is also connected with the input end of a Schmitt trigger, the power end of the Schmitt trigger is connected with an external power supply, the power end of the Schmitt trigger is connected with the ground after passing through a second capacitor C2, the grounding end of the Schmitt trigger is connected with the ground, the output end of the Schmitt trigger is used as the FH end of the optical signal to electrical signal feedback circuit of the upper bridge arm and is transmitted to the system control unit or used as the FB end of the optical signal to electrical signal feedback circuit of the lower bridge arm, the voltage end of the optical fiber receiver is connected with an external power supply, the grounding end of the optical fiber receiver is connected with the ground, and a third capacitor C3 is further connected between the voltage end of the optical fiber receiver and the grounding end; the power supply circuit comprises a voltage stabilizing chip, wherein the input end of the voltage stabilizing chip is respectively connected with an external power supply and one end of a fourth capacitor C4, the output end of the voltage stabilizing chip is respectively connected with the other end of a pull-up resistor, one end of a fifth capacitor C5 and one end of a sixth capacitor C6, and the other end of the fourth capacitor C4, the other end of the fifth capacitor C5, the other end of the sixth capacitor C6 and the grounding end of the voltage stabilizing chip are connected with the ground.