CN211878452U - MOEMS photoswitch drive circuit - Google Patents

Abstract

The utility model discloses a MOEMS photoswitch drive circuit, including the singlechip, insert the alternating current and carry out the rectification to the alternating current, step-down processing and in the output direct current rectification step-down module of output, carry out the isolation noise reduction processing to the direct current that comes from rectification step-down module, and in the output direct current isolation module of the direct current that goes out the noise reduction, carry out boost processing to the direct current that comes from direct current isolation module, and in the output direct current that goes out the boost for MOEMS photoswitch direct current boost module, MOS pipe switch module, be used for inputing a key control signal so that the singlechip is according to the frequency key module of this key control signal control PWM control signal and the display module who is used for showing the frequency of PWM control signal in real time; the single chip microcomputer outputs a PWM control signal, and the MOS tube switch module controls the output voltage of the direct current boosting module according to the PWM control signal so as to drive the MOEMS optical switch to work.

Description

MOEMS photoswitch drive circuit

Technical Field

The utility model relates to an optical communication technical field especially relates to a MOEMS photoswitch drive circuit.

Background

Micro-Opto-Electro-Mechanical systems (MOEMS) technology is an emerging technology, and Micro-scale Mechanical, optical and other devices can be integrated with microelectronic circuits to complete sensing, signal processing, computing, executing and other functions. The MOEMS optical switch mainly comprises an input optical fiber, an output optical fiber, a micro-mirror array, a laser transmitter and a laser receiver, and on-off control of the MOEMS optical switch is realized by controlling on-off of a reflection type optical path consisting of the optical fiber and the micro-mirror array.

The existing MOEMS optical switch driving mode generally controls the on-off of a high-voltage-resistant MOS tube by outputting a low-voltage PWM control signal through a singlechip, thereby providing a current signal input of a high-voltage PWM wave with the same frequency as the PWM control signal for the MOEMS optical switch to drive the MOEMS optical switch. Because the frequency of the high-voltage current signal input to the MOEMS optical switch is the same as the frequency of the PWM control signal output by the single chip microcomputer, the working frequency of the MOEMS optical switch is the same as the frequency of the PWM control signal output by the single chip microcomputer. However, the MOEMS optical switch is driven by adopting the above manner, and the working frequency of the MOEMS optical switch cannot be controlled, adjusted and displayed in real time; in addition, the direct current isolation module of the existing MOEMS optical switch driving circuit is simple, and the power supply noise is not filtered thoroughly, so that the stability of a control system of a single chip microcomputer is seriously influenced, and the MOEMS optical switch cannot be driven normally and effectively.

Disclosure of Invention

The utility model aims to solve the technical problem that a MOEMS photoswitch drive circuit that can real time control adjust and show MOEMS photoswitch's operating frequency is provided.

In order to solve the technical problem, the utility model discloses a as follows technical scheme:

a MOEMS optical switch driving circuit comprises a single chip microcomputer, a rectification voltage reduction module, a direct current isolation module, a direct current boosting module, an MOS tube switch module, a key module and a display module; the single chip microcomputer outputs a PWM control signal to the MOS tube switch module to control the on-off of the MOS tube switch module; the input end of the rectification voltage reduction module is connected with alternating current and used for rectifying and reducing the voltage of the alternating current so as to output direct current at the output end; the input end of the direct current isolation module is connected with the output end of the rectification voltage reduction module and is used for carrying out isolation and noise reduction treatment on the direct current from the rectification voltage reduction module and outputting the noise-reduced direct current at the output end; the input end of the direct current boosting module is connected with the output end of the direct current isolation module and is used for boosting the direct current from the direct current isolation module, outputting the boosted direct current to the MOEMS optical switch at the output end and driving the MOEMS optical switch to work; the MOS tube switch module controls the output voltage of the direct current boosting module according to a PWM control signal from the singlechip to drive the MOEMS optical switch to work; the key module inputs a key control signal to the singlechip so that the singlechip controls the frequency of the PWM control signal according to the key control signal; the display module is connected with the single chip microcomputer and used for acquiring and displaying the frequency of the PWM control signal output by the single chip microcomputer in real time.

Preferably, the singlechip is a singlechip with model number STC15W401AS _ SOP28_ SKDIP 28.

Preferably, the rectifying and voltage reducing module comprises a three-terminal regulator U4, a three-terminal regulator U5, a diode D10, a diode D11, a diode D12, a diode D13, an electrolytic capacitor C50, an electrolytic capacitor C51, a capacitor C52, a capacitor C53, an electrolytic capacitor C54, an electrolytic capacitor C55, a capacitor C56, and a capacitor C56, wherein an anode of the diode D56 and a cathode of the diode D56 are connected to an L line of alternating current, an anode of the diode D56 and a cathode of the diode D56 are connected to an N line of alternating current, a cathode of the diode D56 and a cathode of the diode D56 are connected to an input terminal of the three-terminal regulator U56, an anode of the diode D56 and an anode of the diode D56 are connected to three terminals of the regulator U56, an anode of the electrolytic capacitor C56 is connected to the input terminal of the three-terminal regulator U56, a cathode of the electrolytic capacitor C56 is grounded, the electrolytic capacitor C56 is connected in parallel to two ends of the capacitor, the anode of the electrolytic capacitor C55 is connected with the output end of the three-terminal regulator U4, the cathode of the electrolytic capacitor C55 is grounded, the capacitor C56 is connected in parallel with the two ends of the electrolytic capacitor C55, the cathode of the electrolytic capacitor C51 is connected with the input end of the three-terminal regulator U5, the anode of the electrolytic capacitor C51 is grounded, the capacitor C53 is connected in parallel with the two ends of the electrolytic capacitor C51, the cathode of the electrolytic capacitor C54 is connected with the output end of the three-terminal regulator U5, the anode of the electrolytic capacitor C54 is grounded, the capacitor C57 is connected in parallel with the two ends of the electrolytic capacitor C54, the ground terminal of the three-terminal regulator U4 is connected with the ground terminal of the three-terminal regulator U5, and the output end of the three-terminal regulator U4 is connected with the input end of the dc.

Preferably, the DC isolation module comprises a DC isolation chip U3, an inductor L5, an inductor L6, a capacitor C98 and a capacitor C99, the voltage input end of the direct current isolation chip U3 is connected with one end of the inductor L5, the other end of the inductor L5 is respectively connected with the output end of the rectification voltage-reduction module and one end of the capacitor C98, the input grounding end of the DC isolation chip U3 and the other end of the capacitor C98 are both grounded, the voltage output end of the DC isolation chip U3 is connected with one end of the inductor L6, the other end of the inductor L6 is connected with one end of the capacitor C99, the output ground terminal of the DC isolation chip U3 and the other end of the capacitor C99 are both grounded, and the voltage output end of the direct current isolation chip U3 is used as the output end of the direct current isolation module and is respectively connected with the single chip microcomputer, the direct current boosting module, the key module and the display module.

Preferably, the DC boost module includes a boost DC/DC converter U2, an inductor L1, a resistor R12, a resistor R13, a resistor R14, an adjustable resistor Rc, a zener diode D3, a capacitor C5, a capacitor C6, and a capacitor C7, wherein the 1 st pin of the boost DC/DC converter U2, the 2 nd pin of the boost DC/DC converter U2, the 3 rd pin of the boost DC/DC converter U2, the 4 th pin of the boost DC/DC converter U2, two ends of the inductor L1, one end of the resistor R13, the 1 st end of the adjustable resistor Rc, one end of the capacitor C6, and the anode of the zener diode D3 are all connected to the output end of the DC isolation module, the cathode of the zener diode D3 is connected to one end of the MOEMS optical switch and the resistor R14, respectively, and the other end of the resistor R14 is connected to the 2 nd end of the adjustable resistor Rc, the 3 rd end of the adjustable resistor Rc is connected to one end of a capacitor C7, the other end of the capacitor C7, the other end of the capacitor C6, the 5 th pin of the boost DC/DC converter U2, the 8 th pin of the boost DC/DC converter U2, the 9 th pin of the boost DC/DC converter U2, and the other end of the resistor R13 are all grounded, the resistor R12 is connected between the 6 th pin of the boost DC/DC converter U2 and ground, and the capacitor C5 is connected between the 7 th pin of the boost DC/DC converter U2 and ground.

Preferably, the MOS transistor switch module includes a resistor R16, a resistor R17, and an NMOS transistor Q1, a drain of the NMOS transistor Q1 is connected to an output terminal of the dc boost module, a source of the NMOS transistor Q1 is grounded, a gate of the NMOS transistor Q1 is connected to one end of the resistor R16 and one end of the resistor R17, the other end of the resistor R16 is connected to one pin of the single chip, and the other end of the resistor R17 is grounded.

Preferably, the key module includes a key S1, a key S2, a key S3, a capacitor C1 and a resistor R3, one end of the capacitor C1 is connected to the output end of the dc isolation module, the other end of the capacitor C1 is grounded through a resistor R3, the key S1 is connected in parallel to the capacitor C1, a connection node between the capacitor C1 and the resistor R3 is connected to one pin of the single chip microcomputer, one end of the key S2 and one end of the key S3 are both grounded, and the other end of the key S2 and the other end of the key S3 are connected to one pin of the single chip microcomputer.

Preferably, the display module includes a common-cathode four-digit nixie tube, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a resistor R10, a 1 st pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R7, a 4 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R4, a 5 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R5, a 7 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R10, an 8 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R6, a 9 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R11, a 11 th pin of the common-cathode four-digit nixie tube is connected to one end of the resistor R9, a 12 th pin of the common-cathode four-digit tube is connected to one, The 6 th pin of the totally-shaded four-bit nixie tube and the 10 th pin of the totally-shaded four-bit nixie tube are respectively connected with one pin of the single chip microcomputer, and the other end of the resistor R4, the other end of the resistor R54, the other end of the resistor R64, the other end of the resistor R74, the other end of the resistor R84, the other end of the resistor R94 and the other end of the resistor R104 are connected to the output end of the direct current isolation module.

Preferably, the MOEMS optical switch driving circuit includes a status indication module, and the status indication module includes a power indication unit for indicating a working status of the dc isolation module and a single chip indication unit for indicating a working status of the single chip.

Preferably, the power indication unit comprises a resistor R2 and a light emitting diode D2, one end of the resistor R2 is connected to the output end of the dc isolation module, the other end of the resistor R2 is connected to the anode of the light emitting diode D2, and the cathode of the light emitting diode D2 is grounded; the single chip microcomputer indicating unit comprises a resistor R1 and a light emitting diode D1, one end of the resistor R1 is connected with the output end of the direct current isolation module, the other end of the resistor R1 is connected with the anode of the light emitting diode D1, and the cathode of the light emitting diode D1 is connected with one pin of the single chip microcomputer.

The utility model has the advantages of: the MOEMS optical switch driving circuit comprises a key module and a display module, wherein a key control signal is input to the single chip microcomputer through the key module so that the single chip microcomputer controls the frequency of the PWM control signal according to the key control signal; and the display module acquires and displays the frequency of the PWM control signal output by the singlechip in real time, so that the real-time display of the working frequency of the MOEMS optical switch is realized.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a block diagram of a circuit structure of a MOEMS optical switch driving circuit according to the present invention;

FIG. 2 is a pin wiring diagram of the single chip microcomputer of the present invention;

FIG. 3 is a schematic circuit diagram of the rectification and voltage reduction module of the present invention;

fig. 4 is a schematic circuit diagram of the dc isolation module of the present invention;

fig. 5 is a schematic circuit diagram of the dc boost module of the present invention;

fig. 6 is a schematic circuit diagram of a MOS transistor switch module of the present invention;

fig. 7 is a schematic circuit diagram of the key module of the present invention;

fig. 8 is a schematic circuit diagram of a display module according to the present invention;

fig. 9 is a schematic circuit diagram of a status indication module according to the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.

As shown in fig. 1, in an embodiment of the present invention, the MOEMS optical switch driving circuit includes a single chip microcomputer 10, a rectifying and voltage-reducing module 20, a dc isolation module 30, a dc voltage-increasing module 40, a MOS transistor switch module 60, a key module 70, and a display module. The single chip microcomputer 10 outputs a PWM control signal to the MOS switch module 60 to control the on/off of the MOS switch module 60. The input end of the rectification voltage reduction module 20 is connected with the alternating current, and rectifies and reduces the voltage of the alternating current to output the direct current at the output end. The input end of the dc isolation module 30 is connected to the output end of the rectification and voltage reduction module 20, and is configured to perform isolation and noise reduction processing on the dc power from the rectification and voltage reduction module 20, and output the noise-reduced dc power at the output end. The input end of the dc boost module 40 is connected to the output end of the dc isolation module 30, and is configured to boost the dc power from the dc isolation module 30, and output the boosted dc power to the MOEMS optical switch 50 at the output end, so as to drive the MOEMS optical switch to operate. The MOS switch module 60 controls the output voltage of the dc boost module 40 according to the PWM control signal from the single chip microcomputer 10 to drive the MOEMS optical switch 50 to operate. The key module 70 inputs a key control signal to the single chip microcomputer 10 so that the single chip microcomputer 10 controls the frequency of the PWM control signal according to the key control signal. The display module 80 is connected to the single chip microcomputer 10, and acquires and displays the frequency of the PWM control signal output by the single chip microcomputer 10 in real time.

As shown in fig. 2, the single chip microcomputer 10 is a single chip microcomputer of STC15W401AS _ SOP28_ SKDIP28 type, a 12 th pin of the single chip microcomputer is connected with the direct current isolation module 30, and the direct current isolation module 30 outputs a gentle 5V direct current containing a very small amount of noise to supply power to the single chip microcomputer. In other embodiments of the present invention, the single chip microcomputer may also select a single chip microcomputer of another model, for example, another model single chip microcomputer of STC15W401AS series.

As shown in fig. 3, the rectifying and voltage-reducing module 20 includes a three-terminal regulator U4 of LM7805, a three-terminal regulator U5 of LM7905, a diode D10, a diode D11, a diode D12, a diode D13, an electrolytic capacitor C50, an electrolytic capacitor C51, a capacitor C52, a capacitor C53, an electrolytic capacitor C54, an electrolytic capacitor C55, a capacitor C56, and a capacitor C57, an anode of the diode D10 and a cathode of the diode D11 are connected to an L line of an alternating current, an anode of the diode D12 and a cathode of the diode D13 are connected to an N line of an alternating current, a cathode of the diode D10 and a cathode of the diode D10 are connected to an input terminal of the three-terminal regulator U10, an anode of the diode D10 and an anode of the diode D10 are connected to an input terminal of the three-terminal regulator U10, a cathode of the electrolytic capacitor C10 is connected to a ground, the capacitor C52 is connected in parallel to two ends of the electrolytic capacitor C50, the anode of the electrolytic capacitor C55 is connected to the output end of the three-terminal regulator U4, the cathode of the electrolytic capacitor C55 is grounded, the capacitor C56 is connected in parallel to two ends of the electrolytic capacitor C55, the cathode of the electrolytic capacitor C51 is connected to the input end of the three-terminal regulator U5, the anode of the electrolytic capacitor C51 is grounded, the capacitor C53 is connected in parallel to two ends of the electrolytic capacitor C51, the cathode of the electrolytic capacitor C54 is connected to the output end of the three-terminal regulator U5, the anode of the electrolytic capacitor C54 is grounded, the capacitor C57 is connected in parallel to two ends of the electrolytic capacitor C54, and the ground terminal of the three-terminal regulator U4 is connected to the ground terminal of the three-terminal regulator U5.

The output end of the three-terminal voltage regulator U4 outputs positive 5V direct current, and the output end of the three-terminal voltage regulator U5 outputs negative 5V direct current. The diode D10, the diode D11, the diode D12 and the diode D13 are rectifier diodes; the electrolytic capacitor C50, the electrolytic capacitor C51, the electrolytic capacitor C54 and the electrolytic capacitor C55 change the rectified pulsating direct current voltage into relatively stable direct current voltage by utilizing the charging and discharging characteristics of the electrolytic capacitor C50, the electrolytic capacitor C51, the electrolytic capacitor C54 and the electrolytic capacitor C55; the capacitor C52, the capacitor C53, the capacitor C56 and the capacitor C57 are used for filtering high frequency and pulse interference.

As shown in fig. 4, the input end of the dc isolation module 30 is connected to a terminal P2, the output end of the rectifying and voltage-reducing module 20 is connected to a terminal P1, and the terminal P1 and the terminal P2 are connected, so that the input end of the dc isolation module 30 is connected to the output end of the rectifying and voltage-reducing module 20. The dc isolation module 30 includes a dc isolation chip U3, an inductor L5, an inductor L6, a capacitor C98, and a capacitor C99, a voltage input end (Vin end) of the dc isolation chip U3 is connected to one end of the inductor L5, the other end of the inductor L5 is connected to the output end of the rectification step-down module 20 and one end of the capacitor C98, an input ground end (GND end) of the dc isolation chip U3 and the other end of the capacitor C98 are both grounded, a voltage output end (VOUT end) of the dc isolation chip U3 is connected to one end of the inductor L6, the other end of the inductor L6 is connected to one end of the capacitor C99, an output ground end (0V end) of the dc isolation chip U3 and the other end of the capacitor C99 are both grounded, and a voltage output end of the dc isolation chip U3 is connected to the output end of the dc isolation module 30 as a terminal P3.

The direct current isolation chip U3 can be G0505D, IB0505LS-1W or direct current isolation chips of other models, the output end of the rectification voltage reduction module 20 outputs positive 5V direct current, and after the direct current isolation chip U3 is subjected to isolation and noise reduction processing, 5V direct current gently containing a very small amount of noise is obtained, and current input is provided for the direct current boosting module 40 and the single chip microcomputer 10.

As shown in fig. 5, the input end of the dc boost module 40 is connected to the terminal P4, and the terminal P4 is connected to the terminal P3, so that the input end of the dc boost module 40 is connected to the output end of the dc isolation module 30. The DC boost module 40 includes a boost DC/DC converter U2, an inductor L1, a resistor R12, a resistor R13, a resistor R14, an adjustable resistor Rc, a zener diode D3, a capacitor C5, a capacitor C6, and a capacitor C7, wherein the 1 st pin of the boost DC/DC converter U2, the 2 nd pin of the boost DC/DC converter U2, the 3 rd pin of the boost DC/DC converter U2, the 4 th pin of the boost DC/DC converter U2, two ends of the inductor L1, one end of the resistor R13, the 1 st end of the adjustable resistor Rc, one end of the capacitor C6, and the anode of the zener diode D3 are all connected to the output terminal of the DC isolation module 30, the cathode of the zener diode D3 is connected to one end of the MOEMS optical switch 50 and the resistor R14, respectively, and the other end of the resistor R14 is connected to the 2 nd end of the adjustable resistor Rc, the 3 rd end of the adjustable resistor Rc is connected to one end of a capacitor C7, the other end of the capacitor C7, the other end of the capacitor C6, the 5 th pin of the boost DC/DC converter U2, the 8 th pin of the boost DC/DC converter U2, the 9 th pin of the boost DC/DC converter U2, and the other end of the resistor R13 are all grounded, the resistor R12 is connected between the 6 th pin of the boost DC/DC converter U2 and ground, and the capacitor C5 is connected between the 7 th pin of the boost DC/DC converter U2 and ground.

The boost DC/DC converter U2 inputs a voltage of 5V and outputs a high voltage of 40V from an output terminal (Vout) to drive the MOEMS optical switch 50 to operate. The voltage of the output end (Vout) of the boost type DC/DC converter U2 can be set by adjusting the adjustable resistor Rc, which has an adjustable resistance value ranging from 1k Ω to 20k Ω.

As shown in fig. 5, in a preferred embodiment of the present invention, the dc boost module 40 further includes a filter capacitor C3 and a filter capacitor C4, which respectively filter noise at the input end and the output end of the dc boost module 40.

As shown in fig. 6, the MOS transistor switch module 60 includes a resistor R16, a resistor R17, and an NMOS transistor Q1, a drain of the NMOS transistor Q1 is connected to an output terminal of the dc boost module 40, a source of the NMOS transistor Q1 is grounded, a gate of the NMOS transistor Q1 is connected to one end of the resistor R16 and one end of the resistor R17, the other end of the resistor R16 is connected to one pin (pin 22) of the single chip 10, and the other end of the resistor R17 is grounded.

The single chip microcomputer 10 outputs a PWM wave control signal with a duty ratio of 50% to control the on and off of the high voltage resistant NMOS transistor Q1, when the PWM wave control signal is in the last half period, the NMOS transistor Q1 is turned on to ground the output terminal of the dc boost module 40, and the voltage at the output terminal of the dc boost module 40 is pulled down to zero; when the PWM control signal is in the next half cycle, the NMOS transistor Q1 is turned off, and the voltage at the output terminal of the dc boost module 40 is pulled down to 40V. And alternately switching on and off the NMOS tube Q1 to obtain a high-voltage PWM wave scanning signal to drive the MOEMS optical switch 50 to work.

As shown in fig. 7, the key module 70 includes a key S1, a key S2, a key S3, a capacitor C1, and a resistor R3, one end of the capacitor C1 is connected to the output end of the dc isolation module 30, the other end of the capacitor C1 is grounded through a resistor R3, the key S1 is connected in parallel to the capacitor C1, a connection node between the capacitor C1 and the resistor R3 is connected to a pin (11 th pin) of the single chip microcomputer 10, both one end of the key S2 and one end of the key S3 are grounded, the other end of the key S2 is connected to a pin (10 th pin) of the single chip microcomputer 10, and the other end of the key S3 is connected to a pin (18 th pin) of the single chip microcomputer 10.

A control program is burned in the single chip microcomputer 10, the single chip microcomputer 10 identifies the pressing action of the key S2 by detecting the voltage of the 10 th pin, and the frequency of the PWM wave is controlled to increase by 1Hz when the key S2 is identified to be pressed once; if the button S2 is recognized to be pressed for 3S, the frequency of the PWM wave is controlled to automatically step to the maximum frequency. The single chip microcomputer 10 identifies the pressing action of the key S3 by detecting the voltage of the 18 th pin, and controls the frequency of the PWM wave to be reduced by 1Hz when the key S3 is identified to be pressed once; if the button S3 is recognized to be pressed for 3S, the frequency of the PWM wave is automatically stepped down to the minimum frequency. The single chip microcomputer 10 recognizes the pressing action of the key S1 by detecting the voltage of the 11 th pin, and controls the frequency of the PWM wave to return to the original frequency value and resets the frequency of the PWM wave when recognizing that the key S1 is pressed.

As shown in fig. 8, the display module 80 includes a common-cathode four-digit nixie tube LED, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, the 1 st pin of the common-cathode four-digit nixie tube LED is connected to one end of the resistor R7, the 4 th pin of the common-cathode four-digit nixie tube LED is connected to one end of the resistor R4, the 5 th pin of the common-cathode four-digit nixie tube LED is connected to one end of the resistor R5, the 7 th pin of the common-cathode four-digit nixie tube LED is connected to one end of the resistor R10, the 8 th pin of the common-cathode four-digit tube LED is connected to one end of the resistor R6, the 9 th pin of the common-cathode four-digit tube LED is connected to one end of the resistor R11, the 11 th pin of the common-cathode four-digit tube LED is connected to one end of the resistor R9, the 12 th pin of the common-cathode four-digit tube LED is connected to one, The other end of the resistor R64, the other end of the resistor R74, the other end of the resistor R84, the other end of the resistor R94 and the other end of the resistor R104 are all connected to the output end of the DC isolation module 30.

The 2 nd pin of the totally-shaded four-digit nixie tube LED is connected with one pin (the 4 th pin) of the single chip microcomputer 10, the 3 rd pin of the totally-shaded four-digit nixie tube LED is connected with one pin (the 5 th pin) of the single chip microcomputer 10, the 6 th pin of the totally-shaded four-digit nixie tube LED is connected with one pin (the 6 th pin) of the single chip microcomputer 10, and the 10 th pin of the totally-shaded four-digit nixie tube LED is connected with one pin (the 7 th pin) of the single chip microcomputer 10, so that the totally-shaded four-digit nixie tube LED is in communication connection with the single chip microcomputer 10, and the frequency of the PWM control signal output.

As shown in fig. 1, the MOEMS optical switch driving circuit further includes a status indication module 90, where the status indication module 90 includes a power indication unit and a single chip indication unit.

As shown in fig. 9, the power indication unit includes a resistor R2 and a light emitting diode D2, one end of the resistor R2 is connected to the output terminal of the dc isolation module 30, the other end of the resistor R2 is connected to the anode of the light emitting diode D2, and the cathode of the light emitting diode D2 is grounded. The power supply indicating unit is used for indicating the working state of the dc isolation module 30, and when the light emitting diode D2 is turned on, it indicates that the dc isolation module 30 is working normally. The single chip microcomputer indicating unit comprises a resistor R1 and a light emitting diode D1, one end of the resistor R1 is connected with the output end of the direct current isolation module 30, the other end of the resistor R1 is connected with the anode of the light emitting diode D1, and the cathode of the light emitting diode D1 is connected with one pin (13 th pin) of the single chip microcomputer 10. The single chip microcomputer indicating unit is used for indicating the working state of the single chip microcomputer 10, and when the light emitting diode D1 is lightened, the single chip microcomputer 10 is indicated to work normally.

As shown in fig. 9, in a preferred embodiment of the present invention, the status indication module 90 further includes a capacitor C2, one end of the capacitor C2 is connected to the output end of the dc isolation module 30, and the other end is grounded, and the capacitor C2 is a filtering capacitor and plays a role of filtering out noise waves.

The utility model has the advantages that:

1. the MOEMS optical switch driving circuit comprises a key module and a display module, wherein a key control signal is input into the singlechip through the key module so that the singlechip controls the frequency of the PWM control signal according to the key control signal; and the display module acquires and displays the frequency of the PWM control signal output by the singlechip in real time, so that the real-time display of the working frequency of the MOEMS optical switch is realized.

2. The direct current isolation module 30 comprises a direct current isolation chip U3, and the direct current isolation chip U3 can filter power supply noise, so that a gentle 5V direct current containing a very small amount of noise is obtained to supply power to the single chip microcomputer 10, the influence of the power supply noise on the stability of a control system of the single chip microcomputer is avoided, and the MOEMS optical switch can be normally and effectively driven.

3. The single chip microcomputer 10 outputs a PWM wave control signal with a duty ratio of 50% to control the on and off of a high-voltage-resistant NMOS tube Q1, and the NMOS tube Q1 is alternately switched on and off to obtain a high-voltage PWM wave scanning signal, so that the MOEMS optical switch 50 is driven to work, a control mode of controlling a large signal by a small signal is realized, and the safety and the actual operability of the device are improved.

4. The MOEMS optical switch driving circuit of the utility model has the characteristics of simple structure, low cost, portability, simple use mode and the like.

The foregoing is considered as illustrative of the preferred embodiments of the invention and is not intended to limit the invention in any way. Various equivalent changes and modifications can be made on the basis of the above embodiments by those skilled in the art, and all equivalent changes and modifications within the scope of the claims should fall within the protection scope of the present invention.

Claims (10)

1. A MOEMS optical switch driving circuit is characterized by comprising:

the singlechip is used for outputting a PWM control signal;

the rectification voltage reduction module is used for accessing alternating current, rectifying and reducing the voltage of the alternating current and outputting direct current at an output end;

the input end of the direct current isolation module is connected with the output end of the rectification voltage reduction module, and the direct current isolation module is used for carrying out isolation and noise reduction treatment on the direct current from the rectification voltage reduction module and outputting the noise-reduced direct current at the output end;

the input end of the direct current boosting module is connected with the output end of the direct current isolation module and is used for boosting the direct current from the direct current isolation module and outputting the boosted direct current to the MOEMS optical switch;

the MOS tube switch module controls the output voltage of the direct current boosting module according to a PWM control signal from the singlechip to drive the MOEMS optical switch to work;

the key module inputs a key control signal to the single chip microcomputer so that the single chip microcomputer controls the frequency of the PWM control signal according to the key control signal;

and the display module is connected with the singlechip and is used for displaying the frequency of the PWM control signal in real time.

2. The MOEMS optical switch driver circuit of claim 1, wherein the MOEMS optical switch driver circuit comprises a status indication module, the status indication module comprising:

the power supply indicating unit is used for indicating the working state of the direct current isolation module;

and the singlechip indicating unit is used for indicating the working state of the singlechip.

3. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the rectifying buck module comprises a three-terminal regulator U4, a three-terminal regulator U5, a diode D10, a diode D11, a diode D12, a diode D13, an electrolytic capacitor C50, an electrolytic capacitor C51, a capacitor C52, a capacitor C53, an electrolytic capacitor C54, an electrolytic capacitor C55, a capacitor C56 and a capacitor C57, wherein an anode of the diode D10 and a cathode of the diode D11 are connected with an L line of alternating current, an anode of the diode D12 and a cathode of the diode D13 are connected with an N line of alternating current, a cathode of the diode D10 and a cathode of the diode D12 are connected with an input terminal of the three-terminal regulator U4, an anode of the diode D11 and an anode of the diode D13 are connected with an input terminal of the three-terminal regulator U5, an anode of the electrolytic capacitor C50 is connected with an input terminal regulator U4, the negative electrode of the electrolytic capacitor C50 is grounded, the capacitor C52 is connected in parallel with the two ends of the electrolytic capacitor C50, the anode of the electrolytic capacitor C55 is connected with the output end of the three-terminal voltage regulator U4, the cathode of the electrolytic capacitor C55 is grounded, the capacitor C56 is connected in parallel with two ends of the electrolytic capacitor C55, the negative electrode of the electrolytic capacitor C51 is connected with the input end of the three-terminal voltage regulator U5, the anode of the electrolytic capacitor C51 is grounded, the capacitor C53 is connected in parallel with the two ends of the electrolytic capacitor C51, the negative electrode of the electrolytic capacitor C54 is connected with the output end of the three-terminal voltage regulator U5, the positive electrode of the electrolytic capacitor C54 is grounded, the capacitor C57 is connected in parallel with two ends of the electrolytic capacitor C54, the grounding end of the three-terminal regulator U4 is connected with the grounding end of the three-terminal regulator U5, and the output end of the three-terminal regulator U4 is connected with the input end of the direct-current isolation module.

4. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the dc isolation module comprises a dc isolation chip U3, an inductor L5, an inductor L6, a capacitor C98 and a capacitor C99, a voltage input terminal of the dc isolation chip U3 is connected to one end of the inductor L5, another end of the inductor L5 is connected to an output terminal of the rectifying and voltage-dropping module and one end of the capacitor C98, an input ground terminal of the dc isolation chip U3 and another end of the capacitor C98 are both grounded, a voltage output terminal of the dc isolation chip U3 is connected to one end of the inductor L6, another end of the inductor L6 is connected to one end of the capacitor C99, an output ground terminal of the dc isolation chip U3 and another end of the capacitor C99 are both grounded, a voltage output terminal of the dc isolation chip U3 is used as the dc isolation module output terminal and is connected to the single chip microcomputer, and the single chip microcomputer respectively, The direct current boosting module, the key module and the display module are connected.

5. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the DC boost module comprises a boost DC/DC converter U2, an inductor L1, a resistor R12, a resistor R13, a resistor R14, an adjustable resistor Rc, a zener diode D3, a capacitor C5, a capacitor C6 and a capacitor C7, wherein the 1 st pin of the boost DC/DC converter U2, the 2 nd pin of the boost DC/DC converter U2, the 3 rd pin of the boost DC/DC converter U2, the 4 th pin of the boost DC/DC converter U2, two ends of an inductor L1, one end of the resistor R13, the 1 st end of the adjustable resistor Rc, one end of a capacitor C6 and the anode of a zener diode D3 are all connected to the output end of the DC isolation module, the cathode of the zener diode D3 is respectively connected to one end of the MOEMS optical switch and one end of the resistor R14, and the other end of the adjustable resistor R14 is connected to the first end of the adjustable resistor R14, the 3 rd end of the adjustable resistor Rc is connected to one end of a capacitor C7, the other end of the capacitor C7, the other end of the capacitor C6, the 5 th pin of the boost DC/DC converter U2, the 8 th pin of the boost DC/DC converter U2, the 9 th pin of the boost DC/DC converter U2, and the other end of the resistor R13 are all grounded, the resistor R12 is connected between the 6 th pin of the boost DC/DC converter U2 and ground, and the capacitor C5 is connected between the 7 th pin of the boost DC/DC converter U2 and ground.

6. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the MOS transistor switch module comprises a resistor R16, a resistor R17 and an NMOS transistor Q1, a drain of the NMOS transistor Q1 is connected to the output terminal of the dc boost module, a source of the NMOS transistor Q1 is grounded, a gate of the NMOS transistor Q1 is connected to one end of the resistor R16 and one end of the resistor R17, the other end of the resistor R16 is connected to one pin of the single chip, and the other end of the resistor R17 is grounded.

7. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the key module comprises a key S1, a key S2, a key S3, a capacitor C1 and a resistor R3, one end of the capacitor C1 is connected with the output end of the DC isolation module, the other end of the capacitor C1 is grounded after passing through the resistor R3, the key S1 is connected in parallel with the capacitor C1, a connection node between the capacitor C1 and the resistor R3 is connected with a pin of the single chip microcomputer, one end of the key S2 and one end of the key S3 are both grounded, and the other end of the key S2 and the other end of the key S3 are each connected with a pin of the single chip microcomputer.

8. The MOEMS optical switch driving circuit as claimed in claim 1, wherein the display module comprises a common-cathode four-digit nixie tube, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, the 1 st pin of the common-cathode four-digit nixie tube is connected with one end of the resistor R7, the 4 th pin of the common-cathode four-digit nixie tube is connected with one end of the resistor R4, the 5 th pin of the common-cathode four-digit nixie tube is connected with one end of the resistor R5, the 7 th pin of the common-cathode four-digit nixie tube is connected with one end of the resistor R10, the 8 th pin of the common-cathode four-digit tube is connected with one end of the resistor R6, the 9 th pin of the common-cathode four-digit nixie tube is connected with one end of the resistor R11, the 11 th pin of the common-cathode four-digit tube is connected with one end of the resistor R9, the 12 th pin of the common-cathode nixie tube is connected with, The 3 rd pin of the totally-negative four-bit nixie tube, the 6 th pin of the totally-negative four-bit nixie tube and the 10 th pin of the totally-negative four-bit nixie tube are respectively connected with one pin of the single chip microcomputer, and the other end of the resistor R4, the other end of the resistor R54, the other end of the resistor R64, the other end of the resistor R74, the other end of the resistor R84, the other end of the resistor R94 and the other end of the resistor R104 are connected to the output end of the direct current isolation module.

9. The MOEMS optical switch drive circuit of claim 2, wherein:

the power supply indicating unit comprises a resistor R2 and a light emitting diode D2, one end of the resistor R2 is connected with the output end of the direct current isolation module, the other end of the resistor R2 is connected with the anode of the light emitting diode D2, and the cathode of the light emitting diode D2 is grounded;

the single chip microcomputer indicating unit comprises a resistor R1 and a light emitting diode D1, one end of the resistor R1 is connected with the output end of the direct current isolation module, the other end of the resistor R1 is connected with the anode of the light emitting diode D1, and the cathode of the light emitting diode D1 is connected with one pin of the single chip microcomputer.

10. The MOEMS optical switch drive circuit as claimed in any of claims 1-9, wherein said single chip microcomputer is a model STC15W401AS _ SOP28_ SKDIP28 single chip microcomputer.

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