Self-turn-off microwave switch driving circuit

Abstract

The utility model relates to the technical field of microwave switch driving, and discloses a self-turn-off microwave switch driving circuit, which is used for driving a coil of an electromagnetic driving device and comprises an energy storage unit, a first follow current unit, a voltage dividing unit, a switch tube and a second follow current unit. In actual use, when a control signal enters to drive the microwave switch, the energy storage unit begins to charge, current flows to the voltage dividing unit, and the current forms voltage drop on the voltage dividing unit, so that the switch tube is driven to be conducted, and the coil is connected to a power supply to act; when the energy storage unit is fully charged and no current flows to the voltage dividing unit, the switching tube is switched off, and the coil is powered off, so that current is prevented from flowing through the coil all the time, and heat production and temperature rise are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave switch driving, in particular to a self-shutoff microwave switch driving circuit. Background Art

[0002] Microwave switches, also known as radio frequency switches, are used to switch microwave signal channels and are widely used in communications systems, radar systems, broadcasting, and television. In wireless communications, satellite communications, and base stations, microwave switches are used for signal switching and distribution, improving system flexibility and reliability. In radar systems, microwave switches select different antennas or signal paths for target detection and tracking. In broadcasting and television systems, microwave switches select and distribute signals, ensuring signal stability and clarity.

[0003] During channel switching, a microwave switch typically uses an electromagnetic drive mechanism to move a connector up and down to select the corresponding channel. The connector is typically an RF reed. Microwave switches can be divided into latching and non-latching switches based on whether the electromagnetic drive mechanism maintains its action. For latching switches, a drive voltage is only required when the electromagnetic drive mechanism is in operation; after power is removed, the switch remains in its pre-deactivation position. If the applied drive voltage is not removed, current continues to flow through the electromagnetic drive mechanism's coil, causing it to heat up and, in turn, causing the microwave switch's temperature to rise. This temperature increase can affect the switch's operation and degrade its performance. Utility Model Content

[0004] In view of the shortcomings of the background technology, the utility model provides a self-shutoff microwave switch driving circuit. The technical problem to be solved is that the driving circuit of the existing holding type microwave switch will allow the coil of the electromagnetic driving device to continue to heat up when the driving voltage is not removed during actual use, causing the temperature of the microwave switch to rise, affecting the normal use of the microwave switch.

[0005] In order to solve the above technical problems, the present utility model provides the following technical solutions: a self-shutoff microwave switch driving circuit for driving the coil of an electromagnetic driving device, comprising an energy storage unit, a first freewheeling unit, a voltage dividing unit, a switch tube and a second freewheeling unit;

[0006] One end of the energy storage unit is used to input a control signal, and the other end of the energy storage unit is electrically connected to the input end of the voltage divider unit and one end of the first freewheeling unit respectively, and the other end of the first freewheeling unit is electrically connected to one end of the energy storage unit;

[0007] The output end of the voltage dividing unit is grounded, the voltage dividing end of the voltage dividing unit is electrically connected with the control end of the switch tube, the output end of the switch tube is grounded, the input end of the switch tube is electrically connected with one end of the coil, and the other end of the coil is used for inputting a driving power supply.

[0008] The second freewheeling unit is electrically connected with both ends of the coil to form a second freewheeling loop.

[0009] In some embodiments, the energy storage unit comprises a capacitor C1, one end of the capacitor C1 is used for inputting a control signal, and the other end of the capacitor C1 is electrically connected with the input end of the voltage dividing unit and the voltage stabilizing unit respectively.

[0010] In some embodiments, the first freewheeling unit comprises a freewheeling diode ZD1 and a freewheeling resistor R1, one end of the freewheeling resistor R1 is electrically connected with one end of the capacitor C1, the other end of the freewheeling resistor R1 is electrically connected with the anode of the freewheeling diode ZD1 and grounded, and the cathode of the freewheeling diode ZD1 is electrically connected with the other end of the capacitor C1.

[0011] In some embodiments, the voltage dividing unit comprises N voltage dividing resistors, N is a positive integer greater than 1, all the voltage dividing resistors are connected in series, one end of the first voltage dividing resistor is electrically connected with the other end of the capacitor C1, and the other end of the last voltage dividing resistor is grounded.

[0012] In some embodiments, N is three.

[0013] In some embodiments, when N is two, the resistance ratio of the first voltage dividing resistor to the last voltage dividing resistor is 1:10.

[0014] In some embodiments, when N is two, the resistance of the freewheeling resistor R1 is the same as that of the last voltage dividing resistor.

[0015] In some embodiments, the switch tube is an NMOS tube, the gate of the NMOS tube is the control end of the switch tube, the drain of the NMOS tube is the input end of the switch tube, and the source of the NMOS tube is the output end of the switch tube.

[0016] In some embodiments, the second freewheeling unit comprises a diode D1, the anode of the diode D1 is electrically connected with one end of the coil, and the cathode of the diode D1 is electrically connected with the other end of the coil.

[0017] The utility model discloses a microwave switch drive circuit of self -turning off has the beneficial effect that compared with prior art: when having control signal CON to drive microwave switch, the energy storage unit starts charging, and the current flows to the voltage division unit, and the current forms the voltage drop on the voltage division unit, thereby drive switch tube conduction, and the coil is connected to the power source and acts. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The circuit diagram of the utility model in the embodiment. DETAILED DESCRIPTION

[0019] The utility model will be further explained in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only the basic structure of the utility model is schematically shown, so it only shows the structure related to the utility model.

[0020] As Figure 1 Shown, a kind of self-turning off's microwave switch drive circuit, for driving the coil of electromagnetic drive device, including energy storage unit 1, first freewheeling unit 3, voltage division unit 4, switch tube Q1 and second freewheeling unit 5;

[0021] Energy storage unit 1 one end is used to input control signal CON, and the other end of energy storage unit 1 is electrically connected with the input end of voltage division unit 4 and the one end of first freewheeling unit 3 respectively, and the other end of first freewheeling unit 3 is electrically connected with the one end of energy storage unit 1;

[0022] The output end of voltage division unit 4 is grounded, and the voltage division end of voltage division unit 4 is electrically connected with the control end of switch tube Q1, the output end of switch tube Q1 is grounded, and the input end of switch tube Q1 is electrically connected with the one end of coil L, and the other end of coil L is used to input drive power supply VCC;

[0023] Second freewheeling unit 5 is electrically connected with the both ends of coil, and forms second freewheeling loop.

[0024] When control signal CON comes to drive microwave switch in actual use, energy storage unit 1 starts charging, and the current flows to voltage division unit 4, and the current forms the voltage drop on voltage division unit 4, thereby drive switch tube Q1 conduction, and coil L is connected to drive power supply VCC and acts;When energy storage unit 1 is fully charged, no current flows to voltage division unit 4, and switch tube Q1 is off at this time, and coil L is de-energized, thereby avoiding that coil L has current flowing through all the time, and further avoiding heat production, avoiding temperature rise.

[0025] Specifically, in the embodiment, energy storage unit 1 includes capacitor C1, and one end of capacitor C1 is used to input control signal CON, and the other end of capacitor C1 is electrically connected with the input end of voltage division unit 4 and voltage stabilizing unit 2 respectively.

[0026] Specifically, in this embodiment, the first freewheeling unit 3 includes a freewheeling diode ZD1 and a freewheeling resistor R1, one end of the freewheeling resistor R1 is electrically connected to one end of the capacitor C1, and the other end of the freewheeling resistor R1 is electrically connected to the anode of the freewheeling diode ZD1 and is grounded; the cathode of the freewheeling diode ZD1 is electrically connected to the other end of the capacitor C1.

[0027] In actual use, when the control signal CON is removed, the charge on the capacitor C1 can be released through the freewheeling resistor R1 and the freewheeling diode ZD1.

[0028] Specifically, in this embodiment, the voltage divider unit 4 includes two voltage divider resistors, namely resistor R2 and resistor R3. One end of resistor R2 is electrically connected to the other end of capacitor C1, and the other end of resistor R2 is electrically connected to the control end of switch tube Q1 and one end of resistor R3 respectively. The other end of resistor R3 is grounded.

[0029] Specifically, in this embodiment, the resistance ratio of the resistor R2 to the resistor R3 is 1:10, and the resistance of the freewheeling resistor R1 is the same as the resistance of the resistor R2.

[0030] Exemplarily, the resistance values ​​of the resistor R3 and the freewheeling resistor R1 may be 100 KΩ, and the resistance value of the resistor R2 may be 10 KΩ accordingly.

[0031] In some embodiments, the voltage dividing unit 4 may be provided with other number of voltage dividing resistors to achieve different voltage dividing ratios, which is not limited here. For example, the number of voltage dividing resistors may be 3, 4, 5 or 6.

[0032] In actual use, by setting the resistance values ​​of the resistors R2 and R3 , the charging speed of the capacitor C1 can be set, thereby setting the start-up time of the switch tube Q1 .

[0033] Specifically, in this embodiment, the switch tube Q1 is an NMOS tube, the gate of the NMOS tube is the control end of the switch tube Q1, the drain of the NMOS tube is the input end of the switch tube Q1, and the source of the NMOS tube is the output end of the switch tube Q1.

[0034] Specifically, in this embodiment, the second freewheeling unit 5 includes a diode D1 , an anode of the diode D1 is electrically connected to one end of the coil L, and a cathode of the diode D1 is electrically connected to the other end of the coil L.

[0035] In actual use, when the switch tube Q1 is turned off, the charge on the coil L is released through the diode D1.

[0036] The above is disclosed by the utility model, through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A self-shutoff microwave switch driving circuit for driving the coil of an electromagnetic driving device, characterized in that: It includes an energy storage unit, a first freewheeling unit, a voltage dividing unit, a switch tube and a second freewheeling unit; One end of the energy storage unit is used to input a control signal, and the other end of the energy storage unit is electrically connected to the input end of the voltage divider unit and one end of the first freewheeling unit respectively, and the other end of the first freewheeling unit is electrically connected to one end of the energy storage unit; The output end of the voltage divider unit is grounded, the voltage divider end of the voltage divider unit is electrically connected to the control end of the switch tube, the output end of the switch tube is grounded, the input end of the switch tube is electrically connected to one end of the coil, and the other end of the coil is used to input a driving power supply; The second freewheeling unit is electrically connected to both ends of the coil to form a second freewheeling loop.

2. The self-shutoff microwave switch driving circuit according to claim 1, characterized in that: The energy storage unit includes a capacitor C1 , one end of the capacitor C1 is used to input a control signal, and the other end of the capacitor C1 is electrically connected to the input end of the voltage divider unit and the voltage stabilizing unit respectively.

3. The self-shutoff microwave switch driving circuit according to claim 2, characterized in that: The first freewheeling unit includes a freewheeling diode ZD1 and a freewheeling resistor R1, one end of the freewheeling resistor R1 is electrically connected to one end of the capacitor C1, and the other end of the freewheeling resistor R1 is electrically connected to the anode of the freewheeling diode ZD1 and grounded; the cathode of the freewheeling diode ZD1 is electrically connected to the other end of the capacitor C1.

4. A self-shutoff microwave switch driving circuit according to any one of claims 1 to 3, characterized in that: The voltage divider unit includes N voltage divider resistors, where N is a positive integer greater than 1. All voltage divider resistors are connected in series in sequence, one end of the first voltage divider resistor is electrically connected to the other end of the capacitor C1, and the other end of the terminal voltage divider resistor is grounded.

5. The self-shutoff microwave switch driving circuit according to claim 4, characterized in that: N is three.

6. The self-shutoff microwave switch driving circuit according to claim 4, characterized in that: When N is 2, the resistance ratio of the first-end voltage divider resistor to the end-end voltage divider resistor is 1:

10.

7. The self-shutoff microwave switch driving circuit according to claim 6, characterized in that: When N is 2, the resistance of the freewheeling resistor R1 is the same as the resistance of the terminal voltage divider resistor.

8. The self-shutoff microwave switch driving circuit according to claim 1, characterized in that: The switch tube is an NMOS tube, the gate of the NMOS tube is the control end of the switch tube, the drain of the NMOS tube is the input end of the switch tube, and the source of the NMOS tube is the output end of the switch tube.

9. The self-shutoff microwave switch driving circuit according to claim 1, characterized in that: The second freewheeling unit includes a diode D1 , wherein an anode of the diode D1 is electrically connected to one end of the coil, and a cathode of the diode D1 is electrically connected to the other end of the coil.

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