Vehicle-mounted radio antenna power supply circuit

Abstract

The utility model relates to a vehicle-mounted radio antenna power supply circuit, which comprises a capacitor C01, a capacitor C02, a capacitor C03, a resistor R01, a resistor R02, a resistor R03, a resistor R04, a resistor R05, a resistor R06, a triode Q01, a field effect transistor Q02, an inductor L01, an inductor L01, an inductor L02, a diode D01, a diode D02, a bidirectional diode D03 and a thermistor PTC1. The circuit adopts simple triodes, field effect transistors, resistors, capacitors and other elements, does not need a special chip, reduces BOM cost, and has a perfect protection function and stable power supply capability.

Description

Technical Field

[0001] This utility model relates to a power supply circuit for a vehicle radio antenna, specifically a high-efficiency and stable power supply circuit for vehicle electronic devices. Background Technology

[0002] With the increasing number of in-vehicle electronic devices, the requirements for the stability and safety of power supply circuits are becoming increasingly stringent. Current technology often presents the following problems with the power supply circuits of in-vehicle radio antennas: firstly, the cost is high, with the use of dedicated chips leading to increased BOM costs; secondly, there is a lack of effective overcurrent protection, undervoltage protection mechanisms, and electrostatic discharge protection, which can easily cause equipment damage and affect the normal operation of the equipment.

[0003] Therefore, a power supply circuit for a car radio antenna that can solve the above problems is needed. Utility Model Content

[0004] The purpose of this utility model is to provide a power supply circuit for a car radio antenna to solve the aforementioned technical problems.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a power supply circuit for a car radio antenna, including capacitor C01, capacitor C02, capacitor C03, resistor R01, resistor R02, resistor R03, resistor R04, resistor R05, resistor R06, transistor Q01, field-effect transistor Q02, inductor L01, inductor L01, inductor L02, diode D01, diode D02, bidirectional diode D03, and thermistor PTC1;

[0006] The anode of diode D01 is connected to a +12V power supply, and the cathode of diode D01 is connected to the subsequent circuit. Diode D01 is connected to resistor R03 through resistor R01.

[0007] The base of transistor Q02 is connected to the EN signal through resistor R02, which is used to control whether field-effect transistor Q01 is turned on.

[0008] The gate of the field-effect transistor Q01 is connected to the collector of the transistor Q02 through a resistor R03, which is used to control the opening and closing of the circuit.

[0009] The capacitor C01 and resistor R04 are connected between the gate and source of the field-effect transistor Q01 to absorb voltage spikes caused by the switching of the field-effect transistor.

[0010] The field-effect transistor Q01 is connected to the diode D02 via the thermistor PTC1 for overcurrent protection of the power supply circuit.

[0011] The anode of the diode D02 is connected to the 12V reference level, and the cathode is connected to the circuit output terminal for overvoltage protection of the circuit.

[0012] The field-effect transistor Q01 and the diode D02 are connected by resistors R05 and R06, which are connected in series and grounded. A voltage detection point V_DET is set between the two resistors and connected to the analog input port of the control chip for monitoring the circuit output voltage.

[0013] A bidirectional diode D03 is set between diode D02 and the radio antenna load. One end of the bidirectional diode D03 is grounded and the other end is connected to the power output terminal for electrostatic protection of the circuit.

[0014] Preferably, the thermistor PTC1 and the diode D02 are configured with inductors L01 and L02, and capacitors C02 and C03, which are used for filtering and stabilizing the output voltage.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. Low cost: It uses simple transistors, resistors, capacitors and other components, without the need for dedicated chips, which reduces BOM cost.

[0017] 2. Comprehensive protection functions: It has overcurrent protection, undervoltage protection, voltage monitoring and electrostatic discharge protection functions, which can effectively protect circuits and equipment and improve safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the power supply circuit for the vehicle radio antenna of this utility model; Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown:

[0021] This utility model discloses a power supply circuit for a car radio antenna, comprising capacitors C01, C02, and C03; resistors R01, R02, R03, R04, R05, and R06; transistor Q01; field-effect transistor Q02; inductors L01, L02; diodes D01 and D02; bidirectional diode D03; and thermistor PTC1.

[0022] The anode of diode D01 is connected to a +12V power supply, and the cathode of diode D01 is connected to the subsequent circuit. Diode D01 is connected to resistor R03 via resistor R01. The base of transistor Q02 is connected to the EN signal via resistor R02 to control whether the field-effect transistor Q01 is turned on. The gate of the field-effect transistor Q01 is connected to the collector of transistor Q02 via resistor R03 to control the circuit's on and off states. Capacitor C01 and resistor R04 are connected between the gate and source of the field-effect transistor Q01 to absorb voltage spikes caused by the switching of the field-effect transistor.

[0023] The field-effect transistor Q01 is connected to diode D02 via a thermistor PTC1 for overcurrent protection of the power supply circuit. The anode of diode D02 is connected to a 12V reference level, and the cathode is connected to the circuit output terminal for overvoltage protection. Resistors R05 and R06 are connected between the field-effect transistor Q01 and diode D02. Resistors R05 and R06 are connected in series and grounded, and a voltage detection point V_DET is set between the two resistors and connected to the analog input port of the control chip for monitoring the circuit output voltage. A bidirectional diode D03 is connected between diode D02 and the radio antenna load. One end of the bidirectional diode D03 is grounded, and the other end is connected to the power output terminal for electrostatic discharge protection of the circuit.

[0024] Preferably, the thermistor PTC1 and the diode D02 are configured with inductors L01 and L02, and capacitors C02 and C03, which are used for filtering and stabilizing the output voltage.

[0025] The circuit principle is as follows: Diode D01, with its anode connected to the +12V power supply and its cathode connected to the subsequent circuit, is used for polarity protection to prevent damage to the electrical equipment caused by reverse power connection. The base of transistor Q02 is connected to the EN signal through resistor R02 to control whether the field-effect transistor Q01 is turned on. The gate of MOSFET Q01 is connected to the collector of transistor Q02 through resistor R03 to control the circuit's switching on and off. C01 and R04 are connected between the gate and source of the MOSFET to absorb voltage spikes caused by the MOSFET's switching. PTC1 is a thermistor used for overcurrent protection of the power supply circuit. Inductors L01 and L02, and capacitors C02 and C03 are used for filtering and stabilizing the output voltage. R05 and R06 are connected in series to ground, and a voltage detection point is set between the two resistors, connected to the analog input port of the control chip for monitoring the circuit's output voltage. The anode of D02 is connected to the 12V reference level, and the cathode is connected to the circuit output terminal for overvoltage protection. One end of the bidirectional diode D03 is grounded, and the other end is connected to the power output terminal for electrostatic discharge protection.

Claims

1. A power supply circuit for a vehicle-mounted radio antenna, characterized in that, This includes transistor Q01, field-effect transistor Q02, inductor L01, inductor L02, diode D01, diode D02, bidirectional diode D03, thermistor PTC1, and capacitor C01; The anode of diode D01 is connected to a +12V power supply, and the cathode of diode D01 is connected to the subsequent circuit. Diode D01 is connected to resistor R03 through resistor R01. The base of transistor Q02 is connected to the EN signal through resistor R02, which is used to control whether field-effect transistor Q01 is turned on. The gate of the field-effect transistor Q01 is connected to the collector of the transistor Q02 through a resistor R03, which is used to control the opening and closing of the circuit. The capacitor C01 and resistor R04 are connected between the gate and source of the field-effect transistor Q01 to absorb voltage spikes caused by the switching of the field-effect transistor. The field-effect transistor Q01 is connected to the diode D02 via the thermistor PTC1 for overcurrent protection of the power supply circuit. The anode of the diode D02 is connected to the 12V reference level, and the cathode is connected to the circuit output terminal for overvoltage protection of the circuit. The field-effect transistor Q01 and the diode D02 are connected by resistors R05 and R06, which are connected in series and grounded. A voltage detection point V_DET is set between the two resistors and connected to the analog input port of the control chip for monitoring the circuit output voltage. A bidirectional diode D03 is set between diode D02 and the radio antenna load. One end of the bidirectional diode D03 is grounded and the other end is connected to the power output terminal for electrostatic protection of the circuit.

2. The vehicle radio antenna power supply circuit according to claim 1, characterized in that, The thermistor PTC1 and the diode D02 are connected by inductors L01 and L02, and capacitors C02 and C03. The inductors L01 and L02, and capacitors C02 and C03 are used for filtering and stabilizing the output voltage.

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