Pulse width adjustable magneto-optical switch driving circuit

Abstract

The invention discloses a magneto-optical switch driving circuit with adjustable pulse width, which can output a pulse width signal matched with a magneto-optical switch circuit to drive a magneto-optical switch through the cooperative arrangement of a shaping and protecting module, a pulse adjusting module and a bipolar voltage generating module. And the magneto-optical switch driving circuit is used for replacing a positive and negative pulse generator to drive the magneto-optical switch, so that the cost is effectively reduced, and the function integrity of the circuit can be ensured while the circuit simplicity is improved.

Description

Technical Field

[0001] The invention relates to the technical field of magneto-optical switch driving circuits, in particular to a magneto-optical switch driving circuit with adjustable pulse width. Background Art

[0002] In the prior art, most magneto-optical switch driving circuits require the use of positive and negative pulse generators to output pulse signals, and in order to achieve isolation between the magneto-optical switch and the magneto-optical switch driving circuit, a photoelectric coupler or an isolation transformer is usually used to isolate the magneto-optical switch from the magneto-optical switch driving circuit. Currently, using a positive and negative pulse generator to output pulse signals to drive a magnetic switch is simple and reliable, but the cost of driving a magneto-optical switch is high. Summary of the invention

[0003] Based on this, it is necessary to provide a magneto-optical switch driving circuit with adjustable pulse width. By replacing the positive and negative pulse generators driving the magneto-optical switch with the magneto-optical switch driving circuit with adjustable pulse width, the cost is effectively reduced.

[0004] A magneto-optical switch driving circuit with adjustable pulse width comprises a signal shaping and protection module, a pulse regulation module and a bipolar voltage generating module, wherein the signal input end of the signal shaping and protection module is connected to the output end of a signal generator for receiving a control signal from the signal generator, the signal output end of the signal shaping and protection module is connected to the signal input end of the pulse regulation module, the signal output end of the pulse regulation module is connected to the signal input end of the bipolar voltage generating module, the pulse regulation module is used to adjust the width of an output pulse signal, and the bipolar voltage generating module controls the on and off of the magneto-optical switch by adjusting the output voltage polarity.

[0005] In one of the embodiments, the signal shaping and protection module includes a signal shaping unit and a protection unit, and the signal input ends of the signal shaping unit and the protection unit are respectively connected to the output end of the signal generator.

[0006] In one embodiment, the signal shaping unit includes at least one first Schmitt trigger inverter, a second pull-down resistor and a third power supply, one end of the second pull-down resistor is connected to the input end of the first Schmitt trigger inverter, and the other end is connected to the ground, the first Schmitt trigger inverter is used to shape the input irregular signal waveform into a standard rectangular wave, and the third power supply is used to power the first Schmitt trigger inverter.

[0007] In one embodiment, the protection unit includes a recoverable fuse, a fifth capacitor and a first voltage-stabilizing diode, one end of the recoverable fuse is connected to the VCC terminal, and the other end is respectively connected to the VDD terminal and one end of the fifth capacitor, the other end of the fifth capacitor is connected to the ground, the positive electrode of the first voltage-stabilizing diode is connected to the input terminal of the first Schmitt trigger inverter, and the negative electrode is connected to the ground.

[0008] In one embodiment, the pulse adjustment module includes a first output signal control unit, a second output signal control unit, a third output signal control unit, a second capacitor, a fourth capacitor, a first adjustable resistor, a third adjustable resistor, and a first power supply. The input end of the first output signal control unit is respectively connected to one end of the second capacitor and the output end of the first Schmitt trigger inverter, the output end of the first output signal control unit is connected to the bipolar voltage generating module, the input end of the second output signal control unit is respectively connected to the other end of the second capacitor and the output end of the first Schmitt trigger inverter, the input end of the third output signal control unit is respectively connected to the output end of the second output signal control unit and one end of the fourth capacitor, the output end of the third output signal control unit is connected to the bipolar voltage generating module, the first end of the first adjustable resistor is connected to one end of the second capacitor, and the third end is connected to the ground, the first end of the third adjustable resistor is connected to one end of the fourth capacitor, and the third end is connected to the ground, and the first power supply is used to supply power to the first output signal control unit, the second output signal control unit, and the third output signal control unit, respectively.

[0009] In one embodiment, the first output signal control unit, the second output signal control unit, and the third output signal control unit are NAND gate logic components.

[0010] In one embodiment, the pulse adjustment module further includes a second clamping diode, wherein an anode of the second clamping diode is connected to a first end of the first adjustable resistor, and a cathode of the second clamping diode is connected to a ground.

[0011] In one of the embodiments, the pulse regulation module further includes a third clamping diode, wherein an anode of the third clamping diode is connected to the first end of the third adjustable resistor, and a cathode of the third clamping diode is connected to the ground.

[0012] In one embodiment, the bipolar voltage generating module includes at least one group of bipolar voltage control units, and the bipolar voltage control unit includes a first control subunit and a second control subunit, the control end of the first control subunit is connected to the output end of the first output signal control unit, and the control end of the second control subunit is connected to the output end of the third output signal control unit.

[0013] In one embodiment, the first control subunit is an N-MOS transistor, and the second control subunit is a P-MOS transistor.

[0014] The beneficial effects of the above-mentioned magneto-optical switch driving circuit with adjustable pulse width are as follows: through the coordinated arrangement of the shaping and protection module, the pulse adjustment module and the bipolar voltage generating module, a pulse width signal compatible with the magneto-optical switch circuit can be output to drive the magneto-optical switch, and the magneto-optical switch driving circuit replaces the positive and negative pulse generators to drive the magneto-optical switch, which effectively reduces the cost and improves the simplicity of the circuit while ensuring the functional integrity of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a magneto-optical switch driving circuit with adjustable pulse width according to the present invention; Figure 2 for Figure 1 The circuit principle diagram of the magneto-optical switch driving circuit with adjustable pulse width of the present invention; Figure 3 for Figure 1 A set of pulse waveform diagrams of the magneto-optical switch driving circuit with adjustable pulse width of the present invention; Figure 4 for Figure 1 Another set of pulse waveform diagrams of the magneto-optical switch driving circuit with adjustable pulse width of the present invention. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0017] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. On the contrary, when an element is said to be "directly" connected to another element, there is no intermediate element.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] like Figure 1 and Figure 2 As shown, a magneto-optical switch driving circuit with adjustable pulse width includes a signal shaping and protection module 1, a pulse regulation module 2 and a bipolar voltage generating module 3. The signal input end of the signal shaping and protection module 1 is connected to the output end of the signal generator for receiving a control signal from the signal generator. The signal output end of the signal shaping and protection module 1 is connected to the signal input end of the pulse regulation module 2. The signal output end of the pulse regulation module 2 is connected to the signal input end of the bipolar voltage generating module 3. The pulse regulation module 2 is used to adjust the width of the output pulse signal. The bipolar voltage generating module 3 controls the on and off of the magneto-optical switch by adjusting the output voltage polarity.

[0020] The signal generator sends a signal to the signal shaping and protection module 1. After receiving the signal, the signal shaping and protection module 1 shapes the signal into a standard rectangular wave and sends it to the pulse adjustment module 2. The pulse adjustment module 2 adjusts the pulse signal width to match the magneto-optical switch circuit according to the requirements of the magneto-optical switch circuit and sends it to the bipolar voltage generating module 3. The bipolar voltage generating module 3 controls the on and off of the magneto-optical switch by the output voltage polarity.

[0021] In this way, a magneto-optical switch driving circuit with adjustable pulse width can output a pulse width signal compatible with the magneto-optical switch circuit to drive the magneto-optical switch through the coordinated arrangement of the shaping and protection module 1, the pulse adjustment module 2 and the bipolar voltage generating module 3. Moreover, the magneto-optical switch driving circuit replaces the positive and negative pulse generators to drive the magneto-optical switch, which effectively reduces the cost and improves the simplicity of the circuit while ensuring the functional integrity of the circuit.

[0022] In one embodiment, the signal shaping and protection module 1 comprises a signal shaping unit 11 and a protection unit 12, and the signal input ends of the signal shaping unit 11 and the protection unit 12 are respectively connected to the output end of the signal generator.

[0023] The signal shaping unit 11 includes at least one first Schmitt trigger inverter U1, a second pull-down resistor R2 and a third power supply C3, one end of the second pull-down resistor R2 is connected to the input end of the first Schmitt trigger inverter U1, and the other end is connected to the ground GND, the first Schmitt trigger inverter U1 is used to shape the input irregular signal waveform into a standard rectangular wave, and the third power supply C3 is used to power the first Schmitt trigger inverter U1.

[0024] The third power supply C3 is a capacitor C3. The signal shaping unit 11 in the present application can use a single first Schmitt trigger inverter U1, or a first Schmitt trigger inverter U1 and a second Schmitt trigger inverter U2. The signal output end of the first Schmitt trigger inverter U1 is connected to the signal input end of the second Schmitt trigger inverter U2, and the signal output end of the second Schmitt trigger inverter U2 is connected to the second pin of the first output signal control unit 21. A second pull-down resistor R2 is matched between the first Schmitt trigger inverter U1 and the second Schmitt trigger inverter U2, so that there is an input determined level signal before startup, ensuring that the back end can receive a determined signal, enhancing the driving capability, and shaping the waveform.

[0025] In one embodiment, the protection unit 12 includes a recoverable fuse F1, a fifth capacitor C5 and a first voltage-stabilizing diode D1, one end of the recoverable fuse F1 is connected to the VCC end, and the other end is respectively connected to the VDD end and one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected to the ground GND, the positive electrode of the first voltage-stabilizing diode D1 is connected to the input end of the first Schmitt trigger inverter U1, and the negative electrode is connected to the ground GND.

[0026] By filtering through the fifth capacitor C5, the AC ripple coefficient can be reduced, thereby improving the efficient and smooth DC output. The recoverable fuse F1 is used for current limiting. When the first control subunit 311 and the second control subunit 312 are turned on and off, because the first control subunit 311 is an N-MOS tube and the second control subunit 312 is a P-MOS tube, the N\P channel two tubes have mutually exclusive switching characteristics and a slight difference in switching time. When one MOS tube is turned on, the other MOS tube may not be completely turned off, which may cause a large instantaneous current. Due to the high frequency of the magneto-optical switch, the large current will generate heat accumulation on the recoverable fuse F1, thereby increasing the fuse resistance and clamping the current to a suitable range, ensuring that the circuit is not damaged, and ensuring that there is no short circuit when the back end turns on and off the first control subunit 311 and the second control subunit 312, and the first voltage regulator diode D1 protects the circuit by anti-static.

[0027] In one embodiment, the pulse adjustment module 2 includes a first output signal control unit 21, a second output signal control unit 22, a third output signal control unit 23, a second capacitor C2, a fourth capacitor C4, a first adjustable resistor R1, a third adjustable resistor R3, and a first power supply C1. The input end of the first output signal control unit 21 is respectively connected to one end of the second capacitor C2 and the output end of the first Schmitt trigger inverter U1, the output end of the first output signal control unit 21 is connected to the bipolar voltage generating module 3, and the input end of the second output signal control unit 22 is respectively connected to the other end of the second capacitor C2 and the output end of the first Schmitt trigger inverter U1. The output end of the third output signal control unit 23 is connected to the output end of the second output signal control unit 22 and one end of the fourth capacitor C4, respectively; the output end of the third output signal control unit 23 is connected to the bipolar voltage generating module 3; the first end of the first adjustable resistor R1 is connected to one end of the second capacitor C2, and the third end is connected to the ground GND; the first end of the third adjustable resistor R3 is connected to one end of the fourth capacitor C4, and the third end is connected to the ground GND; the first power supply C1 is used to supply power to the first output signal control unit 21, the second output signal control unit 22, and the third output signal control unit 23, respectively.

[0028] The first output signal control unit 21, the second output signal control unit 22, and the third output signal control unit 23 are NAND gate logic components. The first output signal control unit 21 is a first NAND gate logic component Y1, the second output signal control unit 22 is a second NAND gate logic component Y2, and the third output signal control unit 23 is a third NAND gate logic component Y3.

[0029] like Figure 3 and Figure 4 As shown, the preset resistance value is R, and the resistance value adjusted by the first adjustable resistor R1 is the same as the resistance value adjusted by the third adjustable resistor R3.

[0030] When the resistance value of the first adjustable resistor R1 is adjusted to R, the second capacitor C2 outputs a high-level signal to the first pin of the first NAND gate logic component Y1, the first Schmitt trigger inverter U1 or the second Schmitt trigger inverter U2 outputs a high-level signal to the second pin of the first NAND gate logic component Y1, and after being acted upon by the first NAND gate logic component Y1, a low-level signal is output, and after being rectified by the second control subunit 312, a rising edge pulse is output (see Figure 3Output E1-1); After receiving two high-level signals, the second NAND gate logic component Y2 outputs a low-level signal, and after the NAND gate logic action, the first NAND gate logic component Y1 and the third NAND gate logic component Y3 output opposite pulses. The third NAND gate logic component Y3 inputs two low-level signals. After the NAND gate logic action, the third NAND gate logic component Y3 outputs a high-level signal, and after rectification by the first control subunit 311, it outputs a falling edge pulse (see Figure 3 Output E2-1).

[0031] When the first adjustable resistor R1 has an adjusted resistance greater than R, the impedance of the first adjustable resistor R1 increases, and the circuit current decreases, so that the charging time of the second capacitor C2 is prolonged, and the high level time is prolonged. The first NAND gate logic component Y1 inputs two high level signals, and the second capacitor C2 outputs a high level signal with a relatively long duration to the first pin of the first NAND gate logic component Y1. The first Schmitt trigger inverter U1 or the second Schmitt trigger inverter U2 outputs a high level signal to the second pin of the first NAND gate logic component Y1, and after the logic action with the first NAND gate logic component Y1, a low level signal with a relatively long duration is output; after rectification by the back-end second control subunit 312, a rising edge pulse with a relatively wide pulse width is output (see Figure 4 Output E1-2); After receiving two high-level signals, the second NAND gate logic component Y2 outputs a low-level signal. After the second NAND gate logic component Y2 has a logic action, the first NAND gate logic component Y1 and the third NAND gate logic component Y3 output opposite pulses. The third NAND gate logic component Y3 inputs two low-level signals. Because the third adjustable resistor R3 is grounded, the third pin of the second NAND gate logic component Y2 outputs a low-level signal. Therefore, the second pin of the third NAND gate logic component Y3 inputs a low level. After the NAND gate logic action, the third NAND gate logic component Y3 outputs a high-level signal for a long time. After being rectified by the back-end first control subunit 311, it outputs a falling edge pulse with a wide pulse width (see Figure 4 Output E2-2)).

[0032] The resistance impedance is adjusted by the first adjustable resistor R1 to adjust the circuit current, change the charging and discharging time of the second capacitor C2, and the resistance impedance is adjusted by the third adjustable resistor R3 to adjust the circuit current, change the charging and discharging time of the fourth capacitor C4, extend or shorten the high level duration, and the signal is output after being acted upon by the first NAND gate logic component Y1, the second NAND gate logic component Y2, and the third NAND gate logic component Y3, thereby achieving the effect of adjusting the pulse signal width.

[0033] In one embodiment, the pulse adjustment module 2 further includes a second clamping diode D2 , wherein the anode of the second clamping diode D2 is connected to the first end of the first adjustable resistor R1 , and the cathode of the second clamping diode D2 is connected to the ground GND.

[0034] In this way, by setting the second clamping diode D2, when the current in the circuit changes, the first adjustable resistor R1 can be well protected.

[0035] In one embodiment, the pulse adjustment module 2 further includes a third clamping diode D3 , wherein an anode of the third clamping diode D3 is connected to a first end of the third adjustable resistor R3 , and a cathode of the third clamping diode D3 is connected to a ground GND.

[0036] In this way, by setting the second clamping diode D3, when the current in the circuit changes, the third adjustable resistor R3 can be well protected.

[0037] In one embodiment, the bipolar voltage generating module 3 includes at least one group of bipolar voltage control units, and the bipolar voltage control unit includes a first control subunit 311 and a second control subunit 312, the control end of the first control subunit 311 is connected to the output end of the first output signal control unit 21, and the control end of the second control subunit 312 is connected to the output end of the third output signal control unit 23.

[0038] The first control subunit 311 is an N-MOS tube, and the second control subunit 312 is a P-MOS tube. The bipolar voltage control unit can be one group or two groups. Each group of bipolar voltage control units includes a first control subunit 311 and a second control subunit 312, which are respectively controlled by voltages of opposite polarities. The first control subunit 311 is an N-MOS tube D4 and an N-MOS tube D6, and the second control subunit 312 is a P-MOS tube D5 and a P-MOS tube D7. N-MOS tubes D4 and N-MOS tubes D6 are turned on when a positive voltage is applied, and P-MOS tubes D5 and P-MOS tubes D7 are turned on when a negative voltage is applied. After outputting positive and negative voltages, the magneto-optical crystal is controlled to rotate the polarization plane of the optical signal by changing the direction of the external magnetic field, and jointly determines the on and off of the next-level magneto-optical switch, thereby realizing rapid switching of the optical path.

[0039] The working principle of the present application is as follows: the signal generator sends a signal to the signal shaping and protection module 1, the first Schmitt trigger inverter U1 and the second Schmitt trigger inverter U2 of the signal shaping and protection module 1 shape the signal into a standard rectangular wave and send it to the pulse adjustment module 2, the pulse adjustment module 2 controls the current to change the charging and discharging time of the second capacitor C2 and the fourth capacitor C4 by adjusting the resistance value of the first adjustable resistor R1 and the resistance value of the third adjustable resistor R3 according to the requirements of the magneto-optical switch circuit, so that the voltage continues to maintain a high level state, and is combined with the first NAND gate logic component Y1, the second NAND gate logic component Y2 and the third NAND gate logic component Y3 to adjust the pulse signal width that is compatible with the magneto-optical switch circuit and send it to the bipolar voltage generation module 3, the bipolar voltage generation module 3 controls the on and off of the magneto-optical switch through the first control subunit 311 and the second control subunit 312 with opposite voltage polarities.

[0040] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A magneto-optical switch driving circuit with adjustable pulse width, characterized in that: It includes a signal shaping and protection module, a pulse regulation module and a bipolar voltage generating module. The signal input end of the signal shaping and protection module is connected to the output end of the signal generator and is used to receive the control signal sent by the signal generator. The signal output end of the signal shaping and protection module is connected to the signal input end of the pulse regulation module. The signal output end of the pulse regulation module is connected to the signal input end of the bipolar voltage generating module. The pulse regulation module is used to adjust the width of the output pulse signal. The bipolar voltage generating module controls the on and off of the magneto-optical switch by adjusting the output voltage polarity.

2. The magneto-optical switch driving circuit with adjustable pulse width according to claim 1, characterized in that: The signal shaping and protection module comprises a signal shaping unit and a protection unit, and the signal input ends of the signal shaping unit and the protection unit are respectively connected to the output end of the signal generator.

3. The magneto-optical switch driving circuit with adjustable pulse width according to claim 2, characterized in that: The signal shaping unit includes at least one first Schmitt trigger inverter, a second pull-down resistor and a third power supply, one end of the second pull-down resistor is connected to the input end of the first Schmitt trigger inverter, and the other end is connected to the ground electrode, the first Schmitt trigger inverter is used to shape the input irregular signal waveform into a standard rectangular wave, and the third power supply is used to power the first Schmitt trigger inverter.

4. The magneto-optical switch driving circuit with adjustable pulse width according to claim 3, characterized in that: The protection unit includes a recoverable fuse, a fifth capacitor and a first zener diode, one end of the recoverable fuse is connected to the VCC end, and the other end is respectively connected to the VDD end and one end of the fifth capacitor, the other end of the fifth capacitor is connected to the ground, the anode of the first zener diode is connected to the input end of the first Schmitt trigger inverter, and the cathode is connected to the ground.

5. The magneto-optical switch driving circuit with adjustable pulse width according to claim 4, characterized in that: The pulse adjustment module includes a first output signal control unit, a second output signal control unit, a third output signal control unit, a second capacitor, a fourth capacitor, a first adjustable resistor, a third adjustable resistor, and a first power supply. The input end of the first output signal control unit is respectively connected to one end of the second capacitor and the output end of the first Schmitt trigger inverter, the output end of the first output signal control unit is connected to the bipolar voltage generating module, the input end of the second output signal control unit is respectively connected to the other end of the second capacitor and the output end of the first Schmitt trigger inverter, the input end of the third output signal control unit is respectively connected to the output end of the second output signal control unit and one end of the fourth capacitor, the output end of the third output signal control unit is connected to the bipolar voltage generating module, the first end of the first adjustable resistor is connected to one end of the second capacitor, and the third end is connected to the ground, the first end of the third adjustable resistor is connected to one end of the fourth capacitor, and the third end is connected to the ground, and the first power supply is used to supply power to the first output signal control unit, the second output signal control unit, and the third output signal control unit, respectively.

6. The magneto-optical switch driving circuit with adjustable pulse width according to claim 5, characterized in that: The first output signal control unit, the second output signal control unit and the third output signal control unit are NAND gate logic components.

7. The magneto-optical switch driving circuit with adjustable pulse width according to claim 6, characterized in that: The pulse adjustment module further includes a second clamping diode, wherein the anode of the second clamping diode is connected to the first end of the first adjustable resistor, and the cathode of the second clamping diode is connected to the ground.

8. The magneto-optical switch driving circuit with adjustable pulse width according to claim 7, characterized in that: The pulse adjustment module further includes a third clamping diode, wherein an anode of the third clamping diode is connected to the first end of the third adjustable resistor, and a cathode of the third clamping diode is connected to the ground.

9. The magneto-optical switch driving circuit with adjustable pulse width according to claim 8, characterized in that: The bipolar voltage generating module includes at least one group of bipolar voltage control units, and the bipolar voltage control unit includes a first control subunit and a second control subunit, the control end of the first control subunit is connected to the output end of the first output signal control unit, and the control end of the second control subunit is connected to the output end of the third output signal control unit.

10. The magneto-optical switch driving circuit with adjustable pulse width according to claim 9, characterized in that: The first control subunit is an N-MOS tube, and the second control subunit is a P-MOS tube.

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