Portable adjustable attenuator

Abstract

The utility model discloses a portable adjustable attenuator, comprising a power supply circuit used for providing working voltage for the adjustable attenuator; the dial switch is used for adjusting the attenuation precision unit of the adjustable attenuator so as to carry out signal attenuation on a circuit signal required to be attenuated; the signal input port is used for inputting a circuit signal before attenuation; the signal output port is used for outputting the attenuated circuit signal; the step attenuator is electrically connected with the power supply circuit, the dial switch, the signal input port and the signal output port, and the step attenuator is configured to perform adjustment based on the dial switch so as to attenuate a circuit signal transmitted by the signal input port; wherein the position of the adjustment precision of the step attenuator is 0.25 db. Through the design, the structure and the size of the attenuator can be simplified, the attenuator is convenient to carry, and the attenuation adjustment precision of the attenuator is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency microwave devices, in particular to a convenient adjustable attenuator. Background Art

[0002] The adjustable attenuator is a kind of RF microwave device that can flexibly change the attenuation. It can adjust the signal size by changing the attenuation. It has a wide range of applications in RF circuit systems. The adjustable attenuator is easy to carry, does not require complex control circuits, and does not require the connection of external adapters. It is very helpful for field testing and locating problems. It can be used in radar, wireless communication, test and measurement, and mass consumer electronics.

[0003] Currently, the main type of adjustable attenuators are passive mechanical attenuators, which use mechanical switch structures to switch different attenuation branches to achieve the purpose of attenuation adjustment. This type of attenuator does not require an external control circuit or external power supply;

[0004] However, the problem is that currently adjustable attenuators usually use a mechanical switch structure, which is large in size, heavy, and inconvenient to carry; and the attenuation step usually starts at 1dB, which is not small enough and is not suitable for occasions requiring finer attenuation precision.

[0005] Therefore, the above problems need to be solved urgently by those skilled in the art. Utility Model Content

[0006] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the utility model is to provide a portable adjustable attenuator, which can simplify the structure and volume of the attenuator, facilitate carrying, and at the same time make the attenuation adjustment more precise.

[0007] The utility model adopts the following technical solutions:

[0008] A portable adjustable attenuator, comprising:

[0009] A power supply circuit, used for providing an operating voltage for the adjustable attenuator;

[0010] The dip switch is used to adjust the attenuation precision unit of the adjustable attenuator so as to attenuate the circuit signal that needs to be attenuated;

[0011] A signal input port, used to input the circuit signal before attenuation;

[0012] A signal output port, used to output the attenuated circuit signal;

[0013] A step attenuator is electrically connected to the power supply circuit, the dip switch, the signal input port and the signal output port, respectively. The step attenuator is configured to: adjust based on the dip switch to attenuate the circuit signal transmitted from the signal input port; wherein the adjustment accuracy of the step attenuator is 0.25db.

[0014] Optionally, a swing switch is electrically connected between the power supply circuit and the step attenuator.

[0015] Optionally, a linear regulator is also included, one end of which is electrically connected to the swing switch, and the other end of which is electrically connected to the step attenuator, so as to stabilize the working voltage delivered by the power supply circuit.

[0016] Optionally, a first DC blocking capacitor, one end of which is electrically connected to the signal input terminal, and the other end of which is electrically connected to the step attenuator;

[0017] A second DC blocking capacitor has one end electrically connected to the step attenuator and the other end electrically connected to the signal output end.

[0018] Optionally, the power supply circuit includes:

[0019] A first power supply unit, the first power supply unit comprises a button battery and a first protection diode, an anode of the first protection diode is electrically connected to the button battery, and a cathode of the first protection diode is electrically connected to the wave switch;

[0020] a second power supply unit, the second power supply unit comprising a solar panel, a first current limiting resistor and a second protection diode, one end of the first current limiting resistor is electrically connected to the solar panel, the other end of the first current limiting resistor is electrically connected to the anode of the second protection diode, and the cathode of the second protection diode is electrically connected to the fluctuation switch;

[0021] a third power supply unit, the third power supply unit comprising a charging port, a second current limiting resistor and a third protection diode, one end of the second current limiting resistor is electrically connected to the charging port, the other end of the second current limiting resistor is electrically connected to the anode of the third protection diode, and the cathode of the third protection diode is electrically connected to the fluctuation switch;

[0022] A charging capacitor, one end of which is electrically connected to the cathodes of the second protection diode and the third protection diode, and the other end of which is grounded.

[0023] In summary, the beneficial effects of the utility model are:

[0024] 1. Provide the working voltage to the step attenuator through the power supply circuit, and electrically connect the step attenuator by setting the dip switch, so that the precision unit of the step attenuator can be adjusted by the dip switch to attenuate the circuit signal input to the signal input port;

[0025] 2. By setting the attenuation accuracy unit of the step attenuator to 0.25db, it can be more accurate than the attenuation unit of the traditional step attenuator of 1db.

[0026] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the circuit structure of an embodiment of the utility model.

[0028] Description of reference numerals in the figures:

[0029] 1. Power supply circuit; 11. First power supply unit; 12. Second power supply unit; 13. Third power supply unit; 2. DIP switch; 3. Signal input port; 4. Signal output port; 5. Step attenuator; 6. Swing switch; D1. First protection diode; R1. First current limiting resistor; D2. Second protection diode;

[0030] R2, the second current limiting resistor; D3, the third protection diode; LDO, the linear regulator; C1, the first DC blocking capacitor; C2, the second DC blocking capacitor; C3, the charging capacitor; D4, the fourth protection diode. DETAILED DESCRIPTION

[0031] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0032] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0033] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0034] like Figure 1 As shown, an embodiment of the present application provides a portable adjustable attenuator, including a power supply circuit 1, a dip switch 2, a signal input port 3, a signal output port 4 and a step attenuator 5, wherein the power supply circuit 1 is used to provide a working voltage for the entire adjustable attenuator; the dip switch 2 is used to adjust the attenuation accuracy unit of the entire adjustable attenuator so that the circuit signal to be attenuated is attenuated; the signal input port 3 is used to input the circuit signal before attenuation; the signal output port 4 is used to output the circuit signal after attenuation; the step attenuator 5 is electrically connected to the power supply circuit 1, the dip switch 2, the signal input port 3 and the signal output port 4 respectively, and the step attenuator 5 is configured to: adjust based on the dip switch 2 to attenuate the circuit signal transmitted from the signal input port 3.

[0035] In the embodiment of the present application, the power supply circuit 1 can provide a working voltage for the portable adjustable attenuator of the entire embodiment. Since the traditional attenuator is usually a passive mechanical attenuator, it is large in size and inconvenient to carry. At the same time, the traditional attenuator does not require an external control circuit or an external power supply. The embodiment of the present application sets the power supply circuit 1 to provide a working voltage for the entire portable adjustable attenuator, so as to achieve a convenient effect. The above-mentioned dip switch 2 is electrically connected to the step attenuator 5. The dip switch 2 is also called a DIP switch. By setting the dip switch 2 to be electrically connected to the step attenuator 5, the attenuation accuracy unit of the step attenuator 5 can be adjusted, so that the circuit signal transmitted from the signal input port 3 can be attenuated by the step attenuator 5 and then output by the signal output port 4, replacing the mechanical switch structure to switch different attenuation branches to achieve the purpose of attenuation adjustment, reducing the volume and making it more convenient to carry.

[0036] Furthermore, the adjustment precision unit of the step attenuator 5 is 0.25db. The adjustment precision unit adopted in this embodiment is smaller than the adjustment precision unit of the traditional adjustable attenuator of 1db, thereby enabling the circuit signal attenuation accuracy to be higher; specifically, the model of the above-mentioned step attenuator 5 can be PE43704.

[0037] like Figure 1As shown, a swing switch 6 is electrically connected between the power supply circuit 1 and the step attenuator 5, one end of the swing switch 6 is electrically connected to the voltage output end of the power supply circuit 1, and the other end is electrically connected to the step attenuator 5. By setting the swing switch 6, the on / off control of the working voltage transmitted from the power supply circuit 1 to the step attenuator 5 can be performed; specifically, by controlling the on / off of the circuit between the power supply circuit 1 and the linear regulator LDO, the linear regulator LDO and the step attenuator 5 can be protected.

[0038] like Figure 1 As shown, the embodiment of the present application also includes a linear regulator LDO, one end of which is electrically connected to the fluctuation switch 6, and the other end is electrically connected to the step attenuator 5, for stabilizing the working voltage delivered by the power supply circuit 1.

[0039] In an embodiment of the present application, one end of the linear regulator LDO is electrically connected to the fluctuation switch 6, and the other end of the linear regulator LDO is electrically connected to the step attenuator 5. The linear regulator LDO can be a low voltage difference linear regulator LDO, so that the working voltage output by the power supply circuit 1 can be stabilized. Specifically, the working voltage output by the power supply circuit 1 can be stabilized at 2.8V, so that the step attenuator 5 can be powered.

[0040] like Figure 1 As shown, the embodiment of the present application also includes a first DC blocking capacitor C1 and a second DC blocking capacitor C2, one end of the first DC blocking capacitor C1 is electrically connected to the signal input end, and the other end is electrically connected to the step attenuator 5; one end of the second DC blocking capacitor C2 is electrically connected to the step attenuator 5, and the other end is electrically connected to the signal output end.

[0041] In the embodiment of the present application, the first DC blocking capacitor C1 is used to isolate the DC voltage of the circuit signal transmitted from the signal input end, thereby preventing the DC voltage from damaging the step attenuator 5. The second DC blocking capacitor C2 is used to isolate the DC voltage of the circuit signal after attenuation by the step attenuator 5, thereby smoothing the attenuated circuit signal and ensuring the stability of the circuit signal output from the signal output end.

[0042] like Figure 1 As shown, the power supply circuit 1 includes a first power supply unit 11, a second power supply unit 12, a third power supply unit 13 and a charging capacitor C3. The first power supply unit 11 includes a 3V button battery and a first protection diode D1. The anode of the first protection diode D1 is connected to the button battery, and the cathode is electrically connected to the wave switch 6. By setting the first protection diode D1, it is possible to prevent the current from flowing back to the button battery, thereby damaging the button battery.

[0043] Furthermore, the second power supply unit 12 includes a solar panel, a first current limiting resistor R1 and a second protection diode D2. One end of the first current limiting resistor R1 is electrically connected to the solar panel so as to receive the solar panel, and the other end is electrically connected to the anode of the second protection diode D2. The solar panel is provided to limit the current generated by the first current limiting resistor R1, and then the current is transmitted to the charging capacitor C3 through the second protection diode D2 for charging. At the same time, a fourth protection diode D4 is also provided at the cathode of the second protection diode D2. By providing the fourth protection diode D4, the current backflow of the button battery can be prevented. The third power supply unit 13 includes a charging port, a second current limiting resistor R2 and a third protection diode D3. By providing the charging port, the charging capacitor C3 can be charged. At the same time, the current passes through the second current limiting resistor R2 and the third protection diode D3. Among them, the second protection diode D2 and the third protection diode D3 form a line-and-circuit, so as to prevent the current between the solar panel and the charging port from flowing back to each other; one end of the charging capacitor C3 is electrically connected to the second protection diode D2 and the third protection diode D3, so that the current transmitted by the solar panel and the charging port can charge the charging capacitor C3; specifically, the working voltage provided by the solar panel and the charging port is 5V; it should be noted that the charging capacitor C3 can be a farad capacitor. When the output working voltage of the farad capacitor is less than 3V, the 3V button battery supplies power to the linear regulator LDO through the first protection diode D1 and the closed wave switch 6, so as to power the step attenuator 5, avoiding the traditional way of powering the attenuator, simplifying the structure, reducing the volume and weight, and thus convenient to carry.

[0044] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A portable adjustable attenuator, characterized in that: include: A power supply circuit (1), used for providing an operating voltage for the adjustable attenuator; A dip switch (2) is used to adjust the attenuation precision unit of the adjustable attenuator so as to attenuate the circuit signal to be attenuated; A signal input port (3) for inputting a circuit signal before attenuation; A signal output port (4), used for outputting the attenuated circuit signal; The step attenuator (5) is electrically connected to the power supply circuit (1), the dip switch (2), the signal input port (3) and the signal output port (4) respectively. The step attenuator (5) is configured to: adjust based on the dip switch (2) to attenuate the circuit signal transmitted from the signal input port (3); wherein the adjustment accuracy of the step attenuator (5) is 0.25db.

2. A portable adjustable attenuator according to claim 1, characterized in that: A swing switch (6) is also electrically connected between the power supply circuit (1) and the step attenuator (5).

3. A portable adjustable attenuator according to claim 2, characterized in that: It also includes a linear regulator (LDO), one end of which is electrically connected to the fluctuation switch (6) and the other end of which is electrically connected to the step attenuator (5), and is used to stabilize the working voltage delivered by the power supply circuit (1).

4. A portable adjustable attenuator according to claim 1, characterized in that: Also includes: A first DC blocking capacitor (C1), one end of which is electrically connected to the signal input terminal, and the other end of which is electrically connected to the step attenuator (5); A second DC blocking capacitor (C2) has one end electrically connected to the step attenuator (5) and the other end electrically connected to the signal output end.

5. A portable adjustable attenuator according to claim 2, characterized in that: The power supply circuit (1) comprises: A first power supply unit (11), the first power supply unit (11) comprising a button battery and a first protection diode (D1), an anode of the first protection diode (D1) being electrically connected to the button battery, and a cathode of the first protection diode (D1) being electrically connected to the wave switch (6); A second power supply unit (12), the second power supply unit (12) comprising a solar panel, a first current limiting resistor (R1) and a second protection diode (D2), one end of the first current limiting resistor (R1) being electrically connected to the solar panel, the other end of the first current limiting resistor (R1) being electrically connected to an anode of the second protection diode (D2), and a cathode of the second protection diode (D2) being electrically connected to the wave switch (6); a third power supply unit (13), the third power supply unit (13) comprising a charging port, a second current limiting resistor (R2) and a third protection diode (D3), one end of the second current limiting resistor (R2) being electrically connected to the charging port, the other end of the second current limiting resistor (R2) being electrically connected to an anode of the third protection diode (D3), and a cathode of the third protection diode (D3) being electrically connected to the wave switch (6); A charging capacitor (C3), one end of the charging capacitor (C3) is electrically connected to the cathodes of the second protection diode (D2) and the third protection diode (D3), and the other end is grounded.

Images