An acousto-optic alarm circuit for monitoring faults in a broadcast transmitter
Patent Information
- Application Number
- CN202522009399.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-18
- Publication Date
- 2026-09-18
- Estimated Expiration
- 2035-09-18
AI Technical Summary
[0002]广播发射台站通过广播发射机将广播信号以电磁波的形式发射出去，为保障安全优质播出，发射台站会通过传感器采集发射机运行参数，然后通过通信电缆将传感器采集到的参数送到监控设备进行分析，来判断发射机运行状态是否正常，目前监测设备体积大，造价高，只能固定安装在监控室内，为此本申请提出一种监测广播发射机故障用声光报警电路来解决上述问题
[0016] This type of audible and visual alarm circuit for monitoring radio transmitter faults can solve the problems of high cost, large size, and fixed installation required for current radio transmitter fault monitoring equipment. Although this circuit monitors less data, it monitors the core indicator of "transmission power". This circuit is inexpensive, does not require connection to the transmitter via communication cable, and does not require fixed installation. It allows radio transmitter station staff to monitor the transmitter's operating status in real time, providing a simple monitoring method for radio transmitter stations.
Smart Images
Figure CN224773484U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of broadcast transmission technology, specifically to an audible and visual alarm circuit for monitoring broadcast transmitter malfunctions. Background Technology
[0002] Broadcast transmission stations transmit broadcast signals in the form of electromagnetic waves through broadcast transmitters. To ensure safe and high-quality broadcasting, the transmission station collects transmitter operating parameters through sensors and then sends the collected parameters to monitoring equipment via communication cables for analysis to determine whether the transmitter is operating normally. Currently, the monitoring equipment is large and expensive, and can only be fixedly installed in the monitoring room. Therefore, this application proposes an audible and visual alarm circuit for monitoring broadcast transmitter faults to solve the above problems. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this invention provides an audible and visual alarm circuit for monitoring radio transmitter malfunctions, thus solving the technical problems mentioned in the background. Although this circuit monitors limited data, it focuses on the core indicator of "transmission power," providing a simple monitoring method for radio transmission stations.
[0005] (II) Technical Solution
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: an audible and visual alarm circuit for monitoring radio transmitter faults, comprising a receiving antenna, a frequency selection circuit, an RF amplifier circuit, a rectifier circuit, a common-emitter transistor amplifier circuit, a comparator circuit, and an audible and visual alarm circuit. The receiving antenna, frequency selection circuit, RF amplifier circuit, rectifier circuit, common-emitter transistor amplifier circuit, comparator circuit, and audible and visual alarm circuit are sequentially electrically connected to form a complete signal path for fault monitoring and alarm.
[0007] Preferably, the receiving antenna is used to receive electromagnetic waves emitted by the broadcast transmitter. The frequency selection circuit works in conjunction with the receiving antenna to filter out the target radio frequency signal from the electromagnetic waves. The frequency selection circuit is a parallel resonant circuit composed of capacitor C1 and inductor L1. The resonant frequency can be changed by adjusting the capacitance value of capacitor C1, which is compatible with the full frequency band of medium wave and FM broadcasts.
[0008] Preferably, the radio frequency amplifier circuit uses two identical field-effect transistors Q1 and Q2, and also includes inductors L2 and L3, with the current directions of inductors L2 and L3 being opposite. During the positive half-cycle of the radio frequency signal, field-effect transistor Q1 conducts to amplify the signal, and during the negative half-cycle, field-effect transistor Q2 conducts to amplify the signal, thereby achieving full-cycle signal amplification.
[0009] Preferably, a capacitor C4 and an inductor L4 are connected in series between the RF amplifier circuit and the rectifier circuit, and the series resonant circuit composed of capacitor C4 and inductor L4 has the same resonant frequency as the parallel resonant circuit composed of capacitor C1 and inductor L1 in the frequency selection circuit.
[0010] Preferably, the rectifier circuit consists of a rectifier diode D1 and a filter capacitor C5, which can convert the AC radio frequency signal output by the radio frequency amplifier circuit into a stable DC signal.
[0011] Preferably, the common-emitter amplifier circuit includes a transistor V1, a resistor R5, and a resistor R6. The resistor R5 is the base bias resistor of the transistor V1, and one end of the resistor R6 is connected to the collector of the transistor V1 and the other end is connected to the power supply. It can amplify both the current and voltage of the DC signal output by the rectifier circuit.
[0012] Preferably, the comparison circuit consists of a comparator U1, a resistor R7, and an adjustable resistor R8. The resistor R7 and the adjustable resistor R8 are connected in series, with one end connected to the power supply and the other end grounded. The connection node of the two is connected to the inverting input terminal of the comparator U1 to provide an adjustable reference level. The output terminal of the common-emitter amplifier circuit of the transistor is connected to the non-inverting input terminal of the comparator U1. The comparator U1 outputs high and low levels by comparing the signals at both ends.
[0013] Preferably, the audible and visual alarm circuit includes a light-emitting diode (LED1), a transistor (V2), and a buzzer (BZ1). The base of transistor V2 is connected to the output of the comparator circuit. LED1 is connected to the collector of transistor V2 via a series current-limiting resistor. The emitter of transistor V2 is grounded through buzzer (BZ1). When the comparator circuit outputs a high level, transistor V2 is turned on, LED1 emits light, and buzzer (BZ1) sounds. When the output is low, transistor V2 is turned off, and the alarm component does not work.
[0014] (III) Beneficial Effects
[0015] The beneficial effects of this utility model are as follows:
[0016] This type of audible and visual alarm circuit for monitoring radio transmitter faults can solve the problems of high cost, large size, and fixed installation required for current radio transmitter fault monitoring equipment. Although this circuit monitors less data, it monitors the core indicator of "transmission power". This circuit is inexpensive, does not require connection to the transmitter via communication cable, and does not require fixed installation. It allows radio transmitter station staff to monitor the transmitter's operating status in real time, providing a simple monitoring method for radio transmitter stations. Attached Figure Description
[0017] Figure 1 This is the schematic diagram of the circuit of this utility model. Detailed Implementation
[0018] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0019] like Figure 1 As shown, this utility model provides a technical solution: a schematic diagram of an audible and visual alarm circuit for monitoring radio transmitter faults, including a receiving antenna, a frequency selection circuit, an RF amplifier circuit, a rectifier circuit, a common-emitter transistor amplifier circuit, a comparator circuit, and an audible and visual alarm circuit, wherein the receiving antenna, the frequency selection circuit, the RF amplifier circuit, the rectifier circuit, the common-emitter transistor amplifier circuit, the comparator circuit, and the audible and visual alarm circuit are all electrically connected to each other;
[0020] The receiving antenna is used to receive electromagnetic waves transmitted by the broadcast transmitter. The frequency selection circuit works with the receiving antenna to filter out the target radio frequency signal from the electromagnetic waves. The frequency selection circuit is a parallel resonant circuit composed of capacitor C1 and inductor L1. The resonant frequency can be changed by adjusting the capacitance value of capacitor C1, which is compatible with the full frequency band of medium wave and FM broadcasts.
[0021] The radio frequency amplifier circuit uses two identical field-effect transistors Q1 and Q2, and also includes inductors L2 and L3. The current directions of inductors L2 and L3 are opposite. During the positive half-cycle of the radio frequency signal, field-effect transistor Q1 conducts to amplify the signal, and during the negative half-cycle, field-effect transistor Q2 conducts to amplify the signal, thus achieving full-cycle signal amplification.
[0022] A capacitor C4 and an inductor L4 are connected in series between the RF amplifier circuit and the rectifier circuit. The series resonant circuit formed by capacitor C4 and inductor L4 has the same resonant frequency as the parallel resonant circuit formed by capacitor C1 and inductor L1 in the frequency selection circuit.
[0023] The rectifier circuit consists of rectifier diode D1 and filter capacitor C5, which can convert the AC RF signal output by the RF amplifier circuit into a stable DC signal.
[0024] The common-emitter amplifier circuit includes a transistor V1, resistors R5 and R6. Resistor R5 is the base bias resistor of transistor V1, and resistor R6 is connected to the collector of transistor V1 at one end and the power supply at the other end. It can amplify both the current and voltage of the DC signal output by the rectifier circuit.
[0025] The comparator circuit consists of comparator U1, resistor R7, and adjustable resistor R8. Resistor R7 and adjustable resistor R8 are connected in series, with one end connected to the power supply and the other end grounded. The connection node is connected to the inverting input of comparator U1 to provide an adjustable reference level. The output of the common-emitter amplifier circuit is connected to the non-inverting input of comparator U1. Comparator U1 outputs high and low levels by comparing the signals at both ends.
[0026] The audible and visual alarm circuit includes an LED1, a transistor V2, and a buzzer BZ1. The base of transistor V2 is connected to the output of the comparator circuit. The LED1 is connected to the collector of transistor V2 via a current-limiting resistor. The emitter of transistor V2 is grounded through the buzzer BZ1. When the comparator circuit outputs a high level, transistor V2 is turned on, LED1 lights up, and buzzer BZ1 sounds. When the output is low, transistor V2 is turned off, and the alarm component does not work.
[0027] The working principle of an audible and visual alarm circuit for monitoring radio transmitter malfunctions in this embodiment is as follows:
[0028] The broadcast signal to be monitored is received by the receiving antenna ANT and a parallel resonant frequency selection circuit composed of capacitor C1 and inductor L1. The broadcast signal received by the receiving antenna and frequency selection circuit is amplified by the radio frequency amplifier circuit. Then, the broadcast signal in AC state is converted into DC signal by the rectifier circuit. The DC signal is sent to the common emitter transistor amplifier circuit for dual current and voltage amplification. The amplified DC signal is sent to the comparator for comparison with the reference level. If the comparator outputs a high level, it indicates that there is a fault in the broadcast transmitter. The transistor V2 in the sound and light alarm circuit is turned on, the light-emitting diode LED1 brightens, and the buzzer BZ1 emits a buzzing sound.
[0029] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0030] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An audible and visual alarm circuit for monitoring radio transmitter malfunctions, characterized in that: The system includes a receiving antenna, a frequency selection circuit, an RF amplifier circuit, a rectifier circuit, a common-emitter transistor amplifier circuit, a comparator circuit, and an audible and visual alarm circuit. These components are sequentially connected to form a complete signal path for fault monitoring and alarm. The RF amplifier circuit uses two identical field-effect transistors Q1 and Q2, and also includes inductors L2 and L3, with the currents in inductors L2 and L3 flowing in opposite directions. During the positive half-cycle of the RF signal, field-effect transistor Q1 conducts and amplifies the signal, while during the negative half-cycle, field-effect transistor Q2 conducts and amplifies the signal, achieving full-cycle signal amplification.
2. The audible and visual alarm circuit for monitoring broadcast transmitter malfunctions according to claim 1, characterized in that: The receiving antenna is used to receive electromagnetic waves transmitted by the broadcast transmitter. The frequency selection circuit works with the receiving antenna to filter out the target radio frequency signal from the electromagnetic waves. The frequency selection circuit is a parallel resonant circuit composed of capacitor C1 and inductor L1. The resonant frequency can be changed by adjusting the capacitance value of capacitor C1, which is compatible with the full frequency band of medium wave and FM broadcasts.
3. The audible and visual alarm circuit for monitoring broadcast transmitter malfunctions according to claim 1, characterized in that: The rectifier circuit consists of a rectifier diode D1 and a filter capacitor C5, which can convert the AC radio frequency signal output by the radio frequency amplifier circuit into a stable DC signal.
4. The audible and visual alarm circuit for monitoring broadcast transmitter malfunctions according to claim 1, characterized in that: The common-emitter amplifier circuit includes a transistor V1, resistors R5 and R6. Resistor R5 is the base bias resistor of transistor V1, and resistor R6 is connected to the collector of transistor V1 at one end and the power supply at the other end. It can amplify both the current and voltage of the DC signal output by the rectifier circuit.
5. The audible and visual alarm circuit for monitoring broadcast transmitter malfunctions according to claim 1, characterized in that: The comparison circuit consists of comparator U1, resistor R7 and adjustable resistor R8. Resistor R7 and adjustable resistor R8 are connected in series, with one end connected to the power supply and the other end grounded. The connection node is connected to the inverting input of comparator U1 to provide an adjustable reference level. The output of the common emitter amplifier circuit of the transistor is connected to the non-inverting input of comparator U1. Comparator U1 outputs high and low levels by comparing the signals at both ends.
6. The audible and visual alarm circuit for monitoring broadcast transmitter malfunctions according to claim 1, characterized in that: The audible and visual alarm circuit includes a light-emitting diode (LED1), a transistor (V2), and a buzzer (BZ1). The base of transistor V2 is connected to the output of the comparator circuit. LED1 is connected to the collector of transistor V2 via a current-limiting resistor. The emitter of transistor V2 is grounded through buzzer (BZ1). When the comparator circuit outputs a high level, transistor V2 is turned on, LED1 illuminates, and buzzer (BZ1) sounds. When the output is low, transistor V2 is turned off, and the alarm component does not work.