Startup and shutdown key circuit of satellite antenna

Abstract

The utility model discloses an on-off key circuit of a satellite antenna, which belongs to the field of circuits and is characterized in that divider resistors arranged in the circuit comprise resistors R1, R2 and R4; the input end of the power supply is connected with one end of the R1, the other end of the R1 is connected in series with the antenna key switches S1 and R4, and the resistor R4 is connected in parallel with the Vgs of the switch Q2; the input end of the power supply is connected with one end of the R2, the switch Q1 and the R2 are connected in parallel and are connected with the resistor R3 in series, and the other end of the R3 is connected with the switch Q2; when a satellite antenna is connected with a power supply and an antenna key switch S1 on the satellite antenna is pressed down and closed, R1, S1 and R4 are connected and grounded, the voltage of the R4 is consistent with the Vgs voltage of a switch Q2, and the switch Q2 is saturated and conducted; and the resistor R2, the resistor R3 and the NMOS tube of the switch Q2 are communicated and grounded, so that the resistor R2 and the resistor R3 form partial voltage. The resistors R1, R2, R3 and R4 arranged in the circuit are used for dividing voltage, so that the power supply switch does not need to bear the risk of large current, and the safety and reliability of the satellite antenna are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit field more specifically relates to a satellite antenna's switch on button circuit. BACKGROUND

[0002] On the satellite antenna equipment, the power supply switch of antenna is usually in series in the power supply circuit. When the power of satellite antenna equipment is very big, the power supply switch bears very high overcurrent capacity, which can cause the current through the circuit too large, affecting the safety and reliability of satellite antenna. SUMMARY

[0003] In view of the problems existing in the above field, the utility model provides a satellite antenna's switch on button circuit, through the resistance R1, R2, R3 and R4 for dividing voltage, so that the power supply switch does not need to bear the risk of large current, improves the safety and reliability of satellite antenna.

[0004] To solve the above technical problem, the utility model discloses a satellite antenna's switch on button circuit, including the input and output of power supply, voltage dividing resistance, antenna button switch S1, switch Q1 and switch Q2, voltage dividing resistance includes resistance R1, R2 and R4,

[0005] The input of power supply is connected with one end of resistance R1, and the other end is connected with antenna button switch S1 and resistance R4 in series, and the other end of resistance R4 is grounded, and resistance R4 is connected with the Vgs of switch Q2 in parallel.

[0006] The input of power supply is connected with one end of resistance R2, and the Vgs of switch Q1 is connected with resistance R2 in parallel, and resistance R3 is connected in series, and the other end of resistance R3 is connected with switch Q2.

[0007] When satellite antenna is connected with power supply, and antenna button switch S1 on satellite antenna is closed, resistance R1, antenna button switch S1 and resistance R4 are connected with ground, then switch Q2 is saturated and turns on, resistance R2, resistance R3 and the NMOS pipe of switch Q2 are connected with ground, then resistance R2 and resistance R3 form voltage division.

[0008] Preferably, the PMOS pipe Vds of switch Q1 is disconnected, when satellite antenna is connected with power supply, switch Q1 is disconnected, and the output of power supply does not output voltage.

[0009] Preferably, the voltage of resistance R4 is:

[0010]

[0011] Preferably, the voltage of resistance R3 is:

[0012]

[0013] Preferably, the voltage across the resistor R2 is the difference between the power input voltage and the resistor R3.

[0014] Preferably, the voltage of the PMOS tube Vgs of the switch Q1 is opposite to the voltage across the resistor R2 and has a negative value.

[0015] Preferably, the threshold voltage of the switch Q2 is 0.7V.

[0016] Preferably, the threshold voltage of the switch Q1 is -0.7V.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The satellite antenna power on / off key circuit proposed in this utility model overcomes the technical drawback that when the satellite antenna device is high-power, the power switch must withstand a high current flow rate, which can result in excessive current flowing through the circuit. The resistors R1, R2, R3, and R4 provided in this circuit are used for voltage division. The key switch first turns on the low-current, low-power circuit, which then triggers the high-power electronic switching device to turn on. This improves the satellite antenna power supply circuit, eliminating the risk of the power switch withstanding high current, thereby enhancing the safety and reliability of the satellite antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the circuit diagram of the power button of the satellite antenna of the utility model;

[0020] Figure 2 This is a circuit diagram of a satellite antenna power button in the prior art;

[0021] Figure 3 This is a circuit diagram of a satellite antenna power on / off button provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The following is a combination of the appended examples of the present invention Figures 1-3 , the technical solutions in the embodiments of the present invention are clearly and completely described. It should be understood that the terms used in the present invention are only used to describe specific implementation methods and are not intended to limit the present invention.

[0023] like Figure 1 As shown, an embodiment of the present invention provides a satellite antenna power on / off button circuit, including a power input and output terminal, a voltage divider resistor, an antenna button switch S1, a switch Q1 and a switch Q2; the voltage divider resistor includes a resistor R1, a resistor R2, a resistor R3, and a resistor R4.

[0024] C1 is voltage filter, C2 is switch filter, D1 is electrostatic diode ESD.

[0025] The input end of the power supply is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the antenna button switch S1 and the resistor R4 in series, the resistor R4 is connected with the Vgs of the switch Q2 in parallel.

[0026] The input end of the power supply is connected with one end of the resistor R2, the switch Q1 and the resistor R2 are connected in parallel, and the resistor R2 is connected with the resistor R3 in series, the other end of the resistor R3 is connected with the switch Q2.

[0027] When the satellite antenna is connected with the power supply, the power button S1 on the satellite antenna is pressed to close, the resistor R1, the antenna button switch S1 and the resistor R4 are connected with the ground, the voltage of the resistor R4 is consistent with the Vgs voltage of the switch Q2, and is greater than the threshold voltage of the switch Q2, the switch Q2 is saturated and turned on, and the output end of the power supply outputs the voltage. The resistor R2, the resistor R3 and the NMOS tube of the switch Q2 are connected with the ground, the resistor R2 and the resistor R3 form a voltage divider, the resistor R2 is connected with the switch Q1 in parallel, the Vgs voltage of the PMOS tube of the switch Q1 is less than the threshold voltage of the switch Q1, the PMOS tube of the switch Q1 is saturated and turned on, the output end of the power supply outputs the voltage, and the circuit works normally.

[0028] The Vds of the PMOS tube of the switch Q1 is disconnected, when the satellite antenna is connected with the power supply, the switch Q1 is disconnected, and the output end of the power supply does not output the voltage.

[0029] The voltage of the resistor R4 is:

[0030]

[0031] The voltage of the resistor R3 is:

[0032]

[0033] The voltage value between the resistor R2 is the difference between the input voltage of the power supply and the resistor R3.

[0034] The Vgs voltage of the PMOS tube of the switch Q1 is opposite to the voltage between the resistor R2, and the value is the negative voltage value between the resistor R2.

[0035] The threshold voltage of the switch Q2 is 0.7V, and the threshold voltage of the switch Q1 is -0.7V.

[0036] When the antenna button switch S1 is disconnected, the base electrode Vgs voltage value of the switch Q2 is the same as the voltage value of the resistor R4, and the power supply voltage becomes low level through the discharge of the resistor R4, the switch Q2 is disconnected, the PMOS tube Vgs of the switch Q1 is 0V, which is greater than the threshold voltage of the switch Q1, the switch Q1 is disconnected, and the output end of the power supply does not output voltage, so that the circuit stops working.

[0037] The switch-on button circuit of the satellite antenna provided by the utility model realizes the application improvement circuit of the satellite antenna power supply by the button switch, the small current leading on and the low-power circuit, and the large-power electronic switch device triggering, can solve the risk of the power supply switch bearing large current, and improves the safety and reliability of the satellite antenna.

[0038] Embodiment

[0039] As Figure 2 shown, the satellite antenna switch-on button circuit provided by the prior art is provided on the satellite antenna equipment, the power supply switch of the antenna is connected in series in the power supply circuit, when the power of the satellite antenna equipment is large, the power supply switch bears high overcurrent capacity, cannot solve the risk of the power supply switch bearing large current, and the safety and reliability of the power supply equipment are affected.

[0040] In order to solve the risk of the power supply switch bearing large current and improve the safety and reliability of the equipment, the power supply switch circuit provided by the utility model adds the voltage dividing resistor, the capacitor and the MOS tube to improve and optimize the satellite antenna switch-on button circuit.

[0041] As Figure 3 shown, when the satellite antenna is connected to the 48V power supply, the PMOS tube Vds (voltage between the left and right ends) of the switch Q1 is disconnected, that is, the switch Q1 is disconnected, and the output end of the power supply has no voltage.

[0042] When the antenna button switch S1 on the satellite antenna is pressed and closed, the 48V voltage passes through the voltage dividing network resistor R1, the antenna button switch S1 and the resistor R4 to GND. The voltage of the resistor R4 is about 48 / (51+4)×4=3.49V, and the threshold voltage Vth of the switch Q2 is usually 0.7V. At this time, the Vgs (voltage between the left and bottom) of the switch Q2 is 3.49V, which is greater than the threshold voltage Vth of the switch Q2, and the switch Q2 is saturated and turned on.

[0043] 48V voltage through the voltage dividing network resistance R2, resistance R3, switch Q2 NMOS tube to GND. The voltage of resistance R3 is about 48 / (10+36) * 36=37.56V, the voltage across resistance R2 is 48V-37.56V=10.44V, that is, the PMOS switch Q1 Vgs (the voltage of the lower and left side) voltage is -10.43V. The threshold voltage Vth of switch Q1 is -0.7V, at this time, the Vgs voltage of switch Q1 is -10.44V, which is less than the threshold voltage Vth of switch Q1 -0.7V, the PMOS of switch Q1 is saturated and turned on, that is, the antenna device is powered on, and enters the normal working mode.

[0044] When the antenna needs to be turned off, the power button switch S1 on the antenna is disconnected, the base Vgs voltage of switch Q2 is 3.49V, which is discharged through resistance R4 and becomes low level, and switch Q2 is cut off. At this time, since the Vgs of the PMOS of switch Q1 is 0V, which is greater than the threshold voltage Vth of the PMOS of switch Q1 -0.7V, the Vds of switch Q1 is open, and the switch Q1 is disconnected, and the power output end has no voltage, and the device is powered off.

[0045] The switch-on and switch-off button circuit of the satellite antenna can solve the risk that the power supply switch bears large current when the antenna switch is disconnected, and improves the safety and reliability of the device.

[0046] The above is only a preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A satellite antenna power on / off button circuit, characterized in that: It includes the input and output ends of the power supply, a voltage divider resistor, an antenna key switch S1, a switch Q1 and a switch Q2; the voltage divider resistor includes resistors R1, R2 and R4; The input end of the power supply is connected to one end of the resistor R1, and the other end is connected in series with the antenna key switch S1 and the resistor R4. The other end of the resistor R4 is grounded. The resistor R4 is connected in parallel with the Vgs of the switch Q2. The input end of the power supply is connected to one end of the resistor R2, the Vgs of the switch Q1 and the resistor R2 are connected in parallel, and a resistor R3 is connected in series, and the other end of the resistor R3 is connected to the switch Q2; When the satellite antenna is powered on and the antenna key switch S1 on the satellite antenna is closed, the resistor R1, the antenna key switch S1, and the resistor R4 are connected to the ground, and the switch Q2 is saturated and turned on; the resistor R2, the resistor R3, and the NMOS transistor of the switch Q2 are connected to the ground, and the resistor R2 and the resistor R3 form a voltage divider.

2. The satellite antenna power on / off button circuit according to claim 1, characterized in that: The PMOS tube Vds of the switch Q1 is disconnected. When the satellite antenna is powered on, the switch Q1 is disconnected, and the output end of the power supply does not output voltage.

3. The satellite antenna power on / off button circuit according to claim 2, characterized in that: The voltage of the resistor R4 is:

4. The satellite antenna power on / off button circuit according to claim 3, characterized in that: The voltage of the resistor R3 is:

5. The satellite antenna power on / off key circuit according to claim 4, characterized in that: The voltage across the resistor R2 is the difference between the power input voltage and the resistor R3.

6. The satellite antenna power on / off key circuit according to claim 5, characterized in that: The voltage Vgs of the PMOS tube of the switch Q1 is opposite to the voltage across the resistor R2 and is negative.

7. The satellite antenna power on / off key circuit according to claim 6, characterized in that: The threshold voltage of the switch Q2 is 0.7V.

8. The satellite antenna power on / off key circuit according to claim 7, characterized in that: The threshold voltage of the switch Q1 is -0.7V.

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