A TTL-controlled magnetic latching coaxial switch control circuit with a load terminal

Abstract

The present invention discloses a TTL-controlled magnetic latching coaxial switch control circuit with a load end, which includes a power coil, a radio frequency input port, a radio frequency output port, and an opto-isolated relay. The two ends of the light-emitting diode of the opto-isolated relay are respectively connected to the TTL control end and the ground. The two ends of the photo-detector of the opto-isolated relay are respectively connected to one end of the power coil and the ground. The other end of the power coil is connected to the positive power supply. A radio frequency switch is connected between the radio frequency input port and the radio frequency output port, and the radio frequency switch is a normally open contact corresponding to the power coil. The present invention uses an opto-isolated relay to achieve physical isolation between the TTL voltage and the power supply voltage, eliminating the influence of circuit noise and back peak voltage on the TTL circuit and meeting the requirements of electromagnetic compatibility (EMC).

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency coaxial relays, and specifically to a TTL-controlled magnetic latching coaxial switch control circuit with a load end. Background Art

[0002] A coaxial switch is a component that uses coaxial connectors as radio frequency output terminals, switches / selects microwave signal channels as needed, and realizes high-quality signal transmission. It is widely used in satellite communication, electronic countermeasures, radar, automated test equipment, mobile communication systems, etc. in China. The coaxial switch structure is divided into types such as single-pole double-throw, double-pole double-throw, single-pole multi-throw, double-pole multi-throw, etc. The working methods are magnetic latching and self-resetting types, and its circuit control methods include DC power supply, magnetic latching self-shutdown, TTL control, etc. In the TTL control circuit, generally, a TTL circuit and a coil rated power supply circuit are used. The two circuits share the same ground. The TTL voltage controls the conduction of the triode, thereby turning on the power supply voltage to control the coil and realizing the switching of the radio frequency channel and auxiliary contacts.

[0003] In the currently commonly used coaxial switch TTL circuit, the rated voltage and the TTL voltage must share the same ground, that is, the negative poles of the two externally connected power supply voltages need to be connected. The two power supplies cannot be physically isolated. When the circuit works, the power supply voltage and the back-peak voltage of the switch coil will affect the TTL voltage, and it cannot meet the requirements for electromagnetic compatibility (EMC) in special environments. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a TTL-controlled magnetic latching coaxial switch control circuit with a load end, which can meet the isolation and dual-power supply functions at the same time.

[0005] The technical solution of the present invention is as follows:

[0006] A TTL-controlled magnetic latching coaxial switch control circuit with a load end includes a power coil, a radio frequency input port, a radio frequency output port, and an opto-isolated relay. The two ends of the light-emitting diode of the opto-isolated relay are respectively connected to the TTL control end and the ground. The two ends of the light detector of the opto-isolated relay are respectively connected to one end of the power coil and the ground. The other end of the power coil is connected to the positive power supply. A radio frequency switch is connected between the radio frequency input port and the radio frequency output port. The radio frequency switch is a normally open contact corresponding to the power coil, that is, when the power coil is energized, the radio frequency switch is attracted.

[0007] The TTL controlled magnetic holding type load-end coaxial switch control circuit also includes a reset coil and a reset switch, the photoelectric isolation relay includes a TTL controlled photoelectric isolation relay and a reset photoelectric isolation relay, the two ends of the light emitting diode of the TTL controlled photoelectric isolation relay are respectively connected to the TTL control end and the ground, the two ends of the photodetector of the TTL controlled photoelectric isolation relay are respectively connected to one end of the power coil and the ground, the two ends of the light emitting diode of the reset photoelectric isolation relay are respectively connected to the positive pole and the negative pole of the reset switch, the two ends of the photodetector of the reset photoelectric isolation relay are respectively connected to one end of the reset coil and the ground, the other end of the reset coil is connected to the positive pole of the power supply, the radio frequency switch is a double-throw switch, the active end of the radio frequency switch is connected to the radio frequency output port, the two fixed ends of the radio frequency switch are respectively connected to the radio frequency input port and the ground end, the power coil is energized, the radio frequency input port and the radio frequency output port are connected, the reset coil is energized, and the radio frequency output port and the ground end are connected.

[0008] The TTL controlled magnetic holding type load-end coaxial switch control circuit comprises a plurality of photoelectric isolation relays, a plurality of TTL control ends, a plurality of reset switches, a plurality of power supply coils, a plurality of reset coils and a plurality of radio frequency switches, each photoelectric isolation relay comprises a corresponding TTL controlled photoelectric isolation relay and a reset photoelectric isolation relay, and each photoelectric isolation relay is correspondingly connected to a TTL control end, a reset switch, a power supply coil, a reset coil and a radio frequency switch to form a TTL control circuit.

[0009] The TTL controlled magnetic holding type load-end coaxial switch control circuit also includes an auxiliary indication switch, which is connected to the indication circuit and is a normally open contact corresponding to the power coil, that is, when the power coil is energized, the auxiliary indication switch is closed.

[0010] The TTL controlled magnetic holding type load-end coaxial switch control circuit also includes a backup power supply, the positive pole of the power supply and the positive pole of the backup power supply are both connected to the other end of the power coil, and the positive pole of the power supply and the positive pole of the backup power supply are both connected to the other end of the reset coil.

[0011] The power supply coil and the reset coil are respectively connected in parallel with corresponding diodes, and the cathodes of the diodes are connected to the anode of the power supply.

[0012] Advantages of the present invention:

[0013] (1) The present invention uses a photoelectric isolation relay to achieve physical isolation between the TTL voltage and the power supply voltage, eliminates the influence of circuit noise and reverse peak voltage on the TTL circuit, and meets the requirements of electromagnetic compatibility (EMC).

[0014] (2) The present invention is provided with a backup power supply. When the main power supply is abnormal, the backup power supply is automatically connected, which will not affect the normal operation of the coaxial switch and improves the reliability of the circuit use.

[0015] (3) The present invention is provided with diodes connected in parallel with the power coil and the reset coil, which play a role in suppressing the reverse peak voltage of the coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the circuit diagram of the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] See Figure 1 , a TTL-controlled magnetic latching coaxial switch control circuit with a load end, including two power coils L1 and L2, two reset coils L3 and L4, two reset switches, a radio frequency input port JC, two radio frequency output ports J1 and J2, two radio frequency switches, two opto-isolated relays, two auxiliary indicating switches T1 and T2, and a backup power supply. Each opto-isolated relay includes a corresponding TTL-controlled opto-isolated relay and a reset opto-isolated relay. The two TTL-controlled opto-isolated relays and the two reset opto-isolated relays form four groups of opto-isolated relays V1;

[0019] Both ends of the light-emitting diode of each TTL-controlled opto-isolated relay are respectively connected to the TTL control terminal (terminal 1 or 2) and the ground. Both ends of the light detector of each TTL-controlled opto-isolated relay are respectively connected to one end of the power coil L1 or L2 and the ground. The other end of the power coil L1 is respectively connected to the positive pole of the +28V power supply (terminal 6) and the positive pole of the +28V backup power supply (terminal 5). The other end of the power coil L2 is respectively connected to the positive pole of the +28V power supply (terminal 6) and the positive pole of the +28V backup power supply (terminal 5);

[0020] The two ends of the light-emitting diode of each reset opto-isolated relay are respectively connected to the positive electrode (terminal 3) and the negative electrode (terminal 4) of the reset switch. The two ends of the light detector of each reset opto-isolated relay are respectively connected to one end of the reset coil L3 or L4 and the ground. The other end of the reset coil L3 is respectively connected to the positive electrode of the +28V power supply (terminal 6) and the positive electrode of the +28V backup power supply (terminal 5). The other end of the reset coil L4 is respectively connected to the positive electrode of the +28V power supply (terminal 6) and the positive electrode of the +28V backup power supply (terminal 5);

[0021] Each RF switch is a double-throw switch. The movable end of each RF switch is connected to the RF output port JC. The two fixed ends of each RF switch are respectively connected to the RF input port J1 or J2 and the ground terminal. When the power coils L1 or L2 are energized, the RF input port JC and the RF output port J1 or J2 are conducted. When the reset coils L3 or L4 are energized, the RF output port J1 or J2 is conducted to the ground terminal through a 50-ohm resistor, and the RF input port JC and the RF output port J1 or J2 are disconnected; among them, corresponding diodes D1-D4 are respectively connected in parallel on the power coils L1 and L2 and the reset coils L3 and L4. The negative electrodes of the diodes D1-D4 are all connected to the positive electrode of the +28V power supply (terminal 6) and the positive electrode of the +28V backup power supply (terminal 5);

[0022] Each auxiliary indication switch T1 or T2 is connected to the corresponding indication circuit. Each auxiliary indication switch is a normally open contact corresponding to the power coil L1 or L2, that is, when the power coil L1 or L2 is energized, the auxiliary indication switch T1 or T2 is attracted.

[0023] The control principle of the present invention:

[0024] (1). Working state: Terminal 6 and 7 are respectively connected to the positive electrode of the +28V power supply and the ground. Terminal 4 is connected to the ground of TTL (5Vd.c.). When a high-level (5Vd.c.) pulse is applied to terminal 1, the TTL control opto-isolated relay connected to terminal 1 of the relay V1 is conducted. 28Vd.c. is applied to the power coil L1 through the diode D6, driving the coaxial switch to act, so that the RF input port JC and the RF output port J1 are connected and maintained in this state. At this time, the RF signal is transmitted through JC-J1; at the same time, the auxiliary indication switch T1 is connected and maintained in this state, and terminals 8 and 10 are conducted to perform telemetry feedback on the conduction of JC-J1; when a high-level (5Vd.c.) pulse is applied to terminal 2, similarly, the RF input port JC and the RF output port J2 are connected and maintained in this state, and the auxiliary indication switch T2 is connected and maintained in this state;

[0025] (2) Reset state: When a high-level (5V d.c.) pulse is applied to terminal 3, the reset opto-isolated relay connected to terminal 3 of relay V1 conducts, and 28V d.c. is applied to the reset coil L3 through diode D6 to drive the coaxial switch to operate, disconnecting the RF input port JC from the RF output port J1. The RF output port J1 is grounded through a resistor and remains in this state. At this time, the RF switch is in the reset state. At the same time, the auxiliary indication switch T1 is disconnected, and terminals 8 and 10 are disconnected to provide telemetry feedback on the disconnection of JC-J1.

[0026] (3) Terminal 5 is connected to the positive pole of the +28V backup power supply. When the main power supply connected to terminal 6 fails, the 28V d.c. on terminal 5 is automatically connected to the control circuit for power supply.

[0027] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A TTL-controlled magnetic latching coaxial switch control circuit with a load terminal, characterized in that: It includes a power coil, a radio frequency input port, a radio frequency output port, and an opto-isolated relay. The two ends of the light-emitting diode of the opto-isolated relay are respectively connected to the TTL control terminal and the ground of the TTL. The two ends of the light detector of the opto-isolated relay are respectively connected to one end of the power coil and the ground. The other end of the power coil is connected to the positive power supply. A radio frequency switch is connected between the radio frequency input port and the radio frequency output port. The radio frequency switch is a normally open contact corresponding to the power coil, that is, when the power coil is energized, the radio frequency switch closes. The TTL-controlled magnetic latching coaxial switch control circuit with a load terminal further includes a reset coil and a reset switch. The opto-isolated relay includes a TTL control opto-isolated relay and a reset opto-isolated relay. The two ends of the light-emitting diode of the TTL control opto-isolated relay are respectively connected to the TTL control terminal and the ground of the TTL. The two ends of the light detector of the TTL control opto-isolated relay are respectively connected to one end of the power coil and the ground. The two ends of the light-emitting diode of the reset opto-isolated relay are respectively connected to the positive and negative poles of the reset switch. The two ends of the light detector of the reset opto-isolated relay are respectively connected to one end of the reset coil and the ground. The other end of the reset coil is connected to the positive power supply. The radio frequency switch is a double-throw switch. The movable end of the radio frequency switch is connected to the radio frequency output port. The two fixed ends of the radio frequency switch are respectively connected to the radio frequency input port and the ground terminal. When the power coil is energized, the radio frequency input port and the radio frequency output port are conducted. When the reset coil is energized, the radio frequency output port and the ground terminal are conducted. The TTL-controlled magnetic latching coaxial switch control circuit with a load terminal further includes an auxiliary indication switch. The auxiliary indication switch is connected to the indication circuit. The auxiliary indication switch is a normally open contact corresponding to the power coil, that is, when the power coil is energized, the auxiliary indication switch closes.

2. The coaxial switch control circuit with magnetic holding and load terminal controlled by TTL according to claim 1, characterized in that: The TTL-controlled magnetic latching coaxial switch control circuit with a load terminal includes multiple opto-isolated relays, multiple TTL control terminals, multiple reset switches, multiple power coils, multiple reset coils, and multiple radio frequency switches. Each opto-isolated relay includes a corresponding TTL control opto-isolated relay and a reset opto-isolated relay. Each opto-isolated relay is correspondingly connected to a TTL control terminal, a reset switch, a power coil, a reset coil, and a radio frequency switch to form a path of TTL control circuit.

3. A TTL-controlled magnetic latching coaxial switch control circuit according to claim 1, characterized in that: The TTL-controlled magnetic latching coaxial switch control circuit with a load terminal further includes a backup power supply. The positive pole of the power supply and the positive pole of the backup power supply are both connected to the other end of the power coil. The positive pole of the power supply and the positive pole of the backup power supply terminal are both connected to the other end of the reset coil.

4. A TTL-controlled magnetic latching coaxial switch control circuit according to claim 1, characterized in that: Corresponding diodes are respectively connected in parallel to the power coil and the reset coil. The negative poles of the diodes are all connected to the positive power supply.

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