CN112600636B - Standby power amplifier switching circuit and method and broadcasting system - Google Patents
Standby power amplifier switching circuit and method and broadcasting system Download PDFInfo
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- CN112600636B CN112600636B CN202011455406.0A CN202011455406A CN112600636B CN 112600636 B CN112600636 B CN 112600636B CN 202011455406 A CN202011455406 A CN 202011455406A CN 112600636 B CN112600636 B CN 112600636B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/29—Arrangements for monitoring broadcast services or broadcast-related services
- H04H60/32—Arrangements for monitoring conditions of receiving stations, e.g. malfunction or breakdown of receiving stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/09—Arrangements for device control with a direct linkage to broadcast information or to broadcast space-time; Arrangements for control of broadcast-related services
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The disclosure relates to a switching circuit and a switching method for a standby power amplifier and a broadcasting system, which are used for solving the problem that the standby power amplifier cannot be switched to under the condition that a main power amplifier core control chip is halted. The method comprises the following steps: the power amplifier comprises a main power amplifier fault detection sub-circuit, a control sub-circuit connected with the main power amplifier fault detection sub-circuit, a standby power amplifier state detection sub-circuit connected with the control sub-circuit, a driving sub-circuit connected with the control sub-circuit and a relay connected with the driving sub-circuit; the main power amplifier fault detection sub-circuit is used for outputting a first state level signal according to the fault state of the main power amplifier circuit; the standby power amplifier state detection sub-circuit is used for outputting a second state level signal according to the working state of the standby power amplifier circuit; the control sub-circuit is used for controlling the working state of the driving sub-circuit according to the first state level signal and the second state level signal so as to control the on-off state of the coil of the relay. Therefore, the standby power amplifier circuit can be switched to under the condition that the main power amplifier main chip is halted.
Description
Technical Field
The present disclosure relates to the field of multimedia broadcasting technologies, and in particular, to a circuit and a method for switching a standby power amplifier, and a broadcasting system.
Background
In a broadcasting system, a standby power amplifier circuit needs to be configured for a main power discharge circuit, so that when the main power discharge circuit fails and cannot be played, the main power discharge circuit can be switched to the standby power amplifier circuit, and the broadcasting system can be ensured to be played normally. In a related scene, the function of switching the standby power amplifier circuit is arranged on a core chip of the digital power amplifier circuit for configuration, and the core chip of the digital power amplifier circuit controls the playing function to be switched to the standby circuit under the condition that the main power amplifier circuit fails.
Disclosure of Invention
The disclosure aims to provide a switching circuit and a switching method for a standby power amplifier and a broadcasting system, so as to solve the problem that the switching to the standby power amplifier cannot be performed under the condition that a main power amplifier core control chip is halted in the related art.
In order to achieve the above object, in a first aspect of the embodiments of the present disclosure, a standby power amplifier switching circuit is provided, including:
the power amplifier comprises a main power amplifier fault detection sub-circuit, a control sub-circuit connected with the main power amplifier fault detection sub-circuit, a standby power amplifier state detection sub-circuit connected with the control sub-circuit, a driving sub-circuit connected with the control sub-circuit and a relay connected with the driving sub-circuit;
the main power amplifier fault detection sub-circuit is used for outputting a first state level signal according to the fault state of the main power amplifier circuit;
the standby power amplifier state detection sub-circuit is used for outputting a second state level signal according to the working state of the standby power amplifier circuit;
and the control sub-circuit is used for controlling the working state of the driving sub-circuit according to the first state level signal and the second state level signal so as to control the on-off state of the coil of the relay.
Optionally, the main power amplifier fault detection sub-circuit includes a first micro-control chip, a first resistor R1, a second resistor R2, and a transistor Q1;
the watchdog signal input end of the first micro-control chip is connected with the main power discharge circuit, and the watchdog signal output end of the first micro-control chip is connected with the base electrode of the triode Q1;
the base of the triode Q1 is connected with the power supply through the first resistor R1, the collector of the triode Q1 is connected with the power supply through the second resistor R2, and the emitter of the triode Q1 is constructed as the signal output end of the main power amplifier fault detection sub-circuit and is connected with the first signal input end of the control sub-circuit;
the first microcontroller chip is configured to turn on the transistor Q1 if the main power discharge circuit is in a fault state.
Optionally, the standby power amplifier state detection sub-circuit includes a third resistor R3, a fourth resistor R4, and a first optical coupler;
the anode of the first optical coupler is connected with the anode output end of the standby power amplifier circuit through the third resistor R3, and the cathode of the first optical coupler is connected with the cathode output end of the standby power amplifier circuit;
the emitter of the first optical coupler is connected with the second signal end of the control sub-circuit, and the collector of the first optical coupler is connected with a power supply;
the emitter of the first optocoupler is connected to ground via the fourth resistor R4;
the first optical coupler is configured to conduct when the backup power amplifier circuit is in a non-operational state.
Optionally, the driving sub-circuit comprises a second optocoupler, a fifth resistor R5, a sixth resistor R6 and a diode D1;
the anode of the second optical coupler is connected with the signal output end of the control sub-circuit through the fifth resistor R5, and the cathode of the second optical coupler is grounded;
the emitter of the second optical coupler is connected with the first end of the coil of the relay, and the collector of the second optical coupler is connected with a power supply through the sixth resistor R6;
the cathode of the diode D1 is connected with the first end of the coil of the relay, the anode of the diode D1 is connected with the second end of the coil of the relay, and the second end of the coil is grounded;
the second optocoupler is configured to be turned on when receiving a high-level signal of the control sub-circuit, and the coil of the relay is energized when the second optocoupler is in a conducting state.
Optionally, the driving sub-circuit further comprises a light emitting diode LED and a seventh resistor R7;
the anode of the light emitting diode LED is connected with the first end of the seventh resistor R7, the cathode of the light emitting diode LED is grounded, and the second end of the seventh resistor R7 is connected with the emitter of the second optical coupler;
the light emitting diode LED is configured to emit light when the coil of the relay is energized.
Optionally, the driving sub-circuit further comprises a zener diode D2;
the anode of the zener diode D2 is connected to the cathode of the diode D1, and the cathode of the zener diode D2 is connected to the end of the sixth resistor R6 away from the power supply.
Optionally, the control sub-circuit comprises a second micro-control chip and a nand gate;
wherein the non-inverting input of the nand gate is configured as a first signal input of the control sub-circuit;
the inverting input of the nand gate is configured as the second signal input of the control sub-circuit;
the data input end of the second micro control chip is connected with the output end of the NAND gate;
the signal output of the second microcontroller chip is designed as a signal output of the control subcircuit;
the second micro control chip is configured to output a control signal from the signal output terminal in case the data input terminal receives a target level signal, the control signal being used to control the driving sub-circuit to switch to an operating state.
In a second aspect of the embodiments of the present disclosure, a method for switching a standby power amplifier is provided, including:
detecting the fault state of the main power amplifier circuit through a main power amplifier fault detection sub-circuit, and outputting a first state level signal;
detecting the working state of the standby power amplifier circuit through the standby power amplifier state detection sub-circuit and outputting a second state level signal;
and controlling the working state of the driving sub-circuit through the control sub-circuit based on the first state level signal and the second state level signal so as to control the power-on and power-off state of the coil of the relay.
Optionally, the controlling the operating state of the driving sub-circuit through a control sub-circuit based on the first state level signal and the second state level signal to control the power on/off state of the coil of the relay includes:
under the condition that the first state level signal is a high level signal and the second state level signal is a high level signal, the driving sub-circuit is controlled to be switched to a working state so as to control the coil of the relay to be electrified, under the condition that the coil of the relay is electrified, the standby power amplifier circuit is conducted with a line of a load, and the main power amplifier circuit is disconnected with the line of the load;
and under the condition that the first state level signal is a low level signal and/or the second state level signal is a low level signal, controlling the driving sub-circuit to be switched to a non-working state so as to control the coil of the relay to be powered off, under the condition that the coil of the relay is powered off, the standby power amplifier circuit is disconnected with the circuit of the load, and the main power amplifier circuit is connected with the circuit of the load.
In a third aspect of the embodiments of the present disclosure, a broadcast system is provided, where the broadcast system includes at least one main power amplifier circuit, a standby power amplifier circuit, and the standby power amplifier switching circuit in any one of the first aspect.
Through above-mentioned reserve power amplifier switching circuit, can reach following technological effect at least:
detecting the fault state of the main power amplifier circuit through a main power amplifier fault detection sub-circuit, and outputting a first state level signal; the working state of the standby power amplifier circuit is detected through the standby power amplifier state detection sub-circuit, a second state level signal is output, and then the working state of the driving sub-circuit is controlled through the control sub-circuit based on the first state level signal and the second state level signal so as to control the power on-off state of a coil of the relay, and further the main power amplifier circuit or the standby power amplifier circuit is controlled to be conducted with a circuit of a load. Therefore, even if the core chip of the digital power amplifier circuit is halted, the standby power amplifier can be switched smoothly, the playing stability of the broadcasting system is improved, and the broadcasting system can be ensured to play smoothly.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a circuit diagram illustrating a standby power amplifier switching circuit according to an example embodiment.
Fig. 2 is a flowchart illustrating a method for switching a standby power amplifier according to an exemplary embodiment.
Description of the reference numerals
10-standby power amplifier switching circuit 14-driving sub-circuit 121-second micro-control chip
11-main power amplifier fault detection subcircuit 15-relay 131-first optocoupler
12-control subcircuit 111-first microcontrol chip 141-second optocoupler
13-Standby power amplifier state detection subcircuit 122-NAND gate
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
It should be noted that in the present disclosure, the terms "first", "second", and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. Likewise, the terms "S11", "S12", and the like are used to distinguish steps and are not necessarily to be construed as performing method steps in a particular order or sequence.
Before introducing the backup power amplifier switching circuit, the backup power amplifier switching method, and the broadcasting system provided by the present disclosure, an application scenario of each embodiment of the present disclosure is first introduced. The embodiments of the disclosure can be applied to broadcast systems such as vehicle-mounted multimedia playing systems, electronic device sound playing systems, and the like, and realize that the broadcast system is switched from a main power discharge circuit in a fault state to a standby power amplifier circuit.
However, the inventor found that, in the related art, when a core chip of the digital power amplifier circuit is halted, the main power amplifier circuit cannot be switched to the standby power amplifier, which results in that the broadcasting system cannot play smoothly, and the stability of the broadcasting system is reduced.
For this reason, the present disclosure provides a standby power amplifier switching circuit 10, where the standby power amplifier switching circuit 10 may be applied to, for example, a subway broadcasting system, and referring to a block diagram of a standby power amplifier switching circuit shown in fig. 1, the standby power amplifier switching circuit 10 includes:
the power amplifier fault detection circuit comprises a main power amplifier fault detection sub-circuit 11, a control sub-circuit 12 connected with the main power amplifier fault detection sub-circuit 11, a standby power amplifier state detection sub-circuit 13 connected with the control sub-circuit 12, a driving sub-circuit 14 connected with the control sub-circuit 12 and a relay 15 connected with the driving sub-circuit 14.
The main power amplifier fault detection sub-circuit 11 is configured to output a first state level signal according to a fault state of the main power amplifier circuit.
The standby power amplifier state detection sub-circuit 13 is configured to output a second state level signal according to a working state of the standby power amplifier circuit.
The control sub-circuit 12 is configured to control the working state of the driving sub-circuit 14 according to the first state level signal and the second state level signal, so as to control the power on/off state of the coil of the relay 15.
In specific implementation, the relay 15 is HF 115F-012-2Z. The first end of the coil of the relay 15 is connected with the signal output end of the driving sub-circuit 14, the second end of the coil of the relay 15 is grounded, pin 2 of the relay 15 is connected with the audio output end M-IN + of the main power discharge circuit, pin 7 of the relay 15 is connected with the audio output end M-IN-of the main power discharge circuit, pin 4 of the relay 15 is connected with the audio output end P-IN + of the standby power amplifier circuit, pin 5 of the relay 15 is connected with the audio output end P-IN-of the standby power amplifier circuit, pin 3 of the relay 15 is connected with the anode OUT + of the load, and pin 6 of the relay 15 is connected with the cathode OUT-of the load. Illustratively, the load may be a speaker.
Specifically, when the coil of the relay 15 is powered off, the line of the standby power amplifier circuit and the loudspeaker is cut off, the line of the main power amplifier circuit and the loudspeaker is connected, and the broadcasting system can drive the loudspeaker to broadcast through the main power amplifier circuit. When the coil of the relay 15 is energized, the standby power amplifier circuit is connected to the line of the speaker, the main power amplifier circuit is disconnected from the line of the speaker, and the broadcasting system can drive the speaker to broadcast through the standby power amplifier circuit.
Detecting the fault state of the main power amplifier circuit through a main power amplifier fault detection sub-circuit, and outputting a first state level signal; the working state of the standby power amplifier circuit is detected through the standby power amplifier state detection sub-circuit, a second state level signal is output, and then the working state of the driving sub-circuit is controlled through the control sub-circuit based on the first state level signal and the second state level signal so as to control the power on-off state of a coil of the relay, and further the main power amplifier circuit or the standby power amplifier circuit is controlled to be conducted with a circuit of a load. Therefore, even if the core chip of the digital power amplifier circuit is halted, the standby power amplifier can be switched smoothly, the playing stability of the broadcasting system is improved, and the broadcasting system can be ensured to play smoothly.
Optionally, referring to fig. 1, the main power amplifier fault detection sub-circuit 11 includes a first micro-control chip 111, a first resistor R1, a second resistor R2, and a transistor Q1;
the watchdog signal input end of the first micro control chip 111 is connected with the main power discharge circuit, and the watchdog signal output end of the first micro control chip 111 is connected with the base electrode of the triode Q1;
the base of the transistor Q1 is connected to the power supply via the first resistor R1, the collector of the transistor Q1 is connected to the power supply via the second resistor R2, and the emitter of the transistor Q1 is configured as the signal output terminal of the main power amplifier failure detection sub-circuit 11 and is connected to the first signal input terminal of the control sub-circuit 12;
the first microcontrol chip 111 is configured to turn on the transistor Q1 in the event that the main power discharge circuit is in a fault condition.
Specifically, the first micro-control chip 111 is MAX706, a watchdog signal input end of the MAX706 is connected to the core control chip WD of the main power amplifier circuit, and is configured to receive a fault state of the main power amplifier circuit, a VCC pin of the MAX706 is connected to a 3.3V power supply, a GND pin of the MAX706 is grounded, and a watchdog signal output end of the MAX706 is connected to a base of the transistor Q1.
The resistance of the first resistor R1 is 10K +/-5% omega, the resistance of the second resistor R2 is 100K +/-5% omega, and the resistance of the triode Q1 is 2N 3906.
Specifically, when the main power discharge circuit normally operates, the main power discharge circuit switches the level of the level signal once according to a preset time interval, for example, the main power amplifier circuit outputs a high level signal to the first micro control chip 111 every 1.6 seconds, outputs a low level signal to the first micro control chip 111 after 1.6 seconds of counting, further outputs a high level signal to the first micro control chip 111 after the 1.6 seconds of counting, and so on.
When the first micro control chip 111 is kept at the high level or the low level for 1.6 seconds, the watchdog timer is exhausted, a low level signal is output to the base of the triode Q1, the triode Q1 is turned on, and the emitter of the triode Q1 outputs a high level signal to the control sub-circuit.
By adopting the circuit, whether the main power amplifier main chip is in a fault state or not can be determined according to the level signal switching of the main power amplifier circuit, and the switching of the standby power amplifier circuit can be completed even if the main power amplifier main chip is halted, so that the playing stability of the broadcasting system is improved, and the broadcasting system can be ensured to play smoothly.
Optionally, referring to fig. 1, the standby power amplifier state detection sub-circuit 13 includes a third resistor R3, a fourth resistor R4, and a first optical coupler 131;
the anode of the first optical coupler 131 is connected to the audio output terminal P-IN + of the standby power amplifier circuit through the third resistor R3, and the cathode of the first optical coupler 131 is connected to the audio output terminal P-IN + of the standby power amplifier circuit;
the emitter of the first optical coupler 131 is connected to the second signal terminal of the control sub-circuit 12, and the collector of the first optical coupler 131 is connected to the power supply;
the emitter of the first optocoupler 131 is connected to ground via the fourth resistor R4;
the first optical coupler 131 is configured to be turned on when the standby power amplifier circuit is in a non-operating state.
In specific implementation, the resistance of the third resistor R3 is 4.7K Ω, the resistance of the fourth resistor R4 is 10K Ω, the first optocoupler 131 is a TLP127, and the collector of the first optocoupler 131 is connected to a 3.3V power supply.
Specifically, when the standby circuit is in the operating state, the anode of the first photo-coupler 131 has no voltage signal, the first photo-coupler 131 is in the off state, and the emitter of the first photo-coupler 131 outputs a low level signal to the second signal terminal of the control sub-circuit 12.
In the case where the standby circuit is in the non-operating state, the anode of the first photo-coupler 131 receives the 24V voltage signal, the first photo-coupler 131 is in the conducting state, and the emitter of the first photo-coupler 131 outputs a high level signal to the second signal terminal of the control sub-circuit 12.
By adopting the circuit, under the condition that the standby power amplifier circuit is in a working state, the fact that other main power amplifier circuits have faults and occupy the standby power amplifier circuit can be represented, and the situation that the standby power amplifier circuit is switched in to cause disorder of playing of the standby power amplifier circuit is avoided.
Alternatively, referring to fig. 1, the driving sub-circuit 14 includes a second photo-coupler 141, a fifth resistor R5, a sixth resistor R6, and a diode D1;
the anode of the second optical coupler 141 is connected to the signal output terminal of the control sub-circuit 12 through the fifth resistor R5, and the cathode of the second optical coupler 141 is grounded;
an emitter of the second optocoupler 141 is connected to a first end of the coil of the relay 15, and a collector of the second optocoupler 141 is connected to a power supply via the sixth resistor R6;
the cathode of the diode D1 is connected with the first end of the coil of the relay 15, the anode of the diode D1 is connected with the second end of the coil of the relay 15, and the second end of the coil is grounded;
the second optocoupler 141 is configured to be turned on when receiving a high level signal of the control sub-circuit 12, and the coil of the relay 15 is energized when the second optocoupler 141 is in a conductive state.
In specific implementation, the second optocoupler 141 is TLP127, the fifth resistor R5 has a resistance of 1K Ω, the sixth resistor R6 has a resistance of 0R, the sixth resistor R6 is connected to a 24V power supply, and the diode D1 is RS 1M.
Specifically, when the control sub-circuit 12 outputs the signal to the main power discharge circuit, the second photocoupler 141 is turned off, the emitter of the second photocoupler 141 does not output a signal, and the driving sub-circuit 14 controls the coil of the relay 15 to be in the power-off state.
When the output of the control sub-circuit 12 is switched to the standby power amplifier circuit, the second photocoupler 141 is turned on, the emitter of the second photocoupler 141 outputs a high level signal, and the drive sub-circuit 14 controls the coil of the relay 15 to be in a power-on state.
For example, when the control sub-circuit 12 outputs a low level, the second photocoupler 141 is in a conducting state, the emitter of the second photocoupler 141 outputs a high level signal, and the drive sub-circuit 14 controls the coil of the relay 15 to be in a conducting state.
When the control sub-circuit 12 outputs a high level, the second photocoupler 141 is turned off, the emitter of the second photocoupler 141 outputs a low level signal, and the drive sub-circuit 14 controls the coil of the relay 15 to be in a power-off state.
Optionally, referring to fig. 1, the driving sub-circuit 14 further includes a light emitting diode LED and a seventh resistor R7;
wherein the anode of the light emitting diode LED is connected to the first end of the seventh resistor R7, the cathode of the light emitting diode LED is grounded, and the second end of the seventh resistor R7 is connected to the emitter of the second optocoupler 141;
the light emitting diode LED is configured to emit light when the coil of the relay 15 is energized.
In specific implementation, the light emitting diode LED is a red light emitting diode, and the resistance of the seventh resistor R7 is 10K Ω.
Specifically, under the condition that the coil of the relay 15 is in the energized state, the light emitting diode LED is turned on, and the representation broadcasting system plays the broadcast through the standby power amplifier circuit. Under the condition that the coil of the relay 15 is in a power-off state, the light-emitting diode LED is turned off, and the broadcasting system is represented to play the broadcast through the main power discharge circuit. Therefore, the power amplifier circuit used by the broadcasting system can be displayed to the user in real time.
Optionally, referring to fig. 1, the driving sub-circuit 14 further includes a zener diode D2;
the anode of the zener diode D2 is connected to the cathode of the diode D1, and the cathode of the zener diode D2 is connected to the end of the sixth resistor R6 away from the power supply.
In specific implementation, the zener diode D2 is SMBJ 24A.
By adopting the circuit, the circuit can be prevented from being burnt out by peak voltage and current, and the stability of the driving sub-circuit is improved.
Optionally, referring to fig. 1, the control sub-circuit 12 includes a second micro-control chip 121 and a nand gate 122;
wherein the non-inverting input of the nand gate 122 is configured as a first signal input of the control sub-circuit 12;
the inverting input of the nand-gate 122 is configured as a second signal input of the control sub-circuit 12;
the data input end of the second micro control chip 121 is connected to the output end of the nand gate 122;
the signal output of the second microcontroller chip 121 is designed as a signal output of the control sub-circuit 12;
the second micro control chip 121 is configured to output a control signal from the signal output terminal in case the data input terminal receives a target level signal, the control signal being used to control the driving sub-circuit 14 to switch to the working state.
In one embodiment, the non-inverting input of the nand gate 122 is configured as the first signal input of the control sub-circuit 12, and is connected to the signal output of the main power amplifier failure detection sub-circuit 11, i.e., to the emitter of the transistor Q1.
The inverting input of the nand-gate 122 is configured as a second signal input of the control sub-circuit 12, connected to the emitter of the first optocoupler 131.
The second mcu 121 is 74LVC1G125GV, the OE _ n enable input terminal of the second mcu 121 is configured as the enable signal input terminal of the control sub-circuit 12, the OE _ n enable input terminal is grounded, the ground terminal GND of the second mcu 121 is grounded, VCC of the second mcu 121 is connected to the 3.3V power supply, and Y of the second mcu 121 is connected to the signal input terminal of the driving sub-circuit 14.
The nand gate 122 outputs a low level signal to drive the second micro control chip 121 to output a low level when the non-inverting input terminal and the inverting input terminal both receive the high level signal; the nand gate 122 outputs a high level signal to drive the second micro-control chip 121 to output a high level when the non-inverting input terminal receives a low level signal and/or the inverting input terminal receives a low level signal.
The second micro control chip 121 is configured to output a high level from the signal output end when the data input end receives a high level signal of the target level signal, where the high level is used to control the driving sub-circuit 14 to switch to a working state, and the standby power amplifier circuit is connected to the load circuit; and under the condition that the target level signal received by the data input end is a low level signal, outputting a low level from the signal output end, wherein the low level is used for controlling the driving sub-circuit 14 to be switched to a non-working state, and the main power amplifier circuit is communicated with a load circuit.
The fault state of the main power amplifier circuit, the working state of the standby power amplifier circuit and the power on/off state of the relay are shown in table 1:
| main power amplifier circuit | Standby power amplifier circuit | Relay with a movable contact |
| Normal state | Occupancy state | Coil power-off |
| Normal state | Idle state | Coil power-off |
| Fault state | Occupancy state | Coil power-off |
| Fault state | Idle state | Energizing the coil |
TABLE 1
In the case of switching the drive sub-circuit 14 to the operating state, the coil of the relay 15 is energized; in case the drive sub-circuit 14 is switched to the inactive state, the coil of the relay 15 is de-energized.
Based on the same inventive concept, an embodiment of the present disclosure further provides a method for switching a standby power amplifier, and fig. 2 is a flowchart of the method for switching a standby power amplifier according to an exemplary embodiment. As shown in fig. 2, the method includes the following steps.
In step S11, a fault state of the main power amplifier circuit is detected by the main power amplifier fault detection sub-circuit, and a first state level signal is output.
In step S12, the operating state of the standby power amplifier circuit is detected by the standby power amplifier state detection sub-circuit, and a second state level signal is output.
In step S13, the operating state of the driving sub-circuit is controlled by the control sub-circuit based on the first state level signal and the second state level signal to control the on/off state of the coil of the relay.
Detecting the fault state of the main power amplifier circuit through a main power amplifier fault detection sub-circuit, and outputting a first state level signal; the working state of the standby power amplifier circuit is detected through the standby power amplifier state detection sub-circuit, a second state level signal is output, and then the working state of the driving sub-circuit is controlled through the control sub-circuit based on the first state level signal and the second state level signal so as to control the power on-off state of a coil of the relay, and further the main power amplifier circuit or the standby power amplifier circuit is controlled to be conducted with a circuit of a load. Therefore, even if the main chip of the main power amplifier circuit is halted, the main chip can be smoothly switched to the standby power amplifier circuit, the playing stability of the broadcasting system is improved, and the broadcasting system can be ensured to play smoothly.
Optionally, in step S13, the controlling the on/off state of the coil of the relay by controlling the operating state of the driving sub-circuit through the control sub-circuit based on the first state level signal and the second state level signal includes:
under the condition that the first state level signal is a high level signal and the second state level signal is a high level signal, the driving sub-circuit is controlled to be switched to a working state so as to control the coil of the relay to be electrified, under the condition that the coil of the relay is electrified, the standby power amplifier circuit is conducted with a line of a load, and the main power amplifier circuit is disconnected with the line of the load;
and under the condition that the first state level signal is a low level signal and/or the second state level signal is a low level signal, controlling the driving sub-circuit to be switched to a non-working state so as to control the coil of the relay to be powered off, under the condition that the coil of the relay is powered off, the standby power amplifier circuit is disconnected with the circuit of the load, and the main power amplifier circuit is connected with the circuit of the load.
The embodiment of the disclosure further provides a broadcasting system, which includes at least one main power amplifier circuit, a standby power amplifier circuit and the standby power amplifier switching circuit.
Optionally, the broadcast system further comprises a power supply, a speaker, etc.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A standby power amplifier switching circuit, comprising:
the power amplifier state detection circuit comprises a main power amplifier fault detection sub-circuit (11), a control sub-circuit (12) connected with the main power amplifier fault detection sub-circuit (11), a standby power amplifier state detection sub-circuit (13) connected with the control sub-circuit (12), a driving sub-circuit (14) connected with the control sub-circuit (12), and a relay (15) connected with the driving sub-circuit (14);
the main power amplifier fault detection sub-circuit (11) is used for outputting a first state level signal according to the fault state of the main power amplifier circuit;
the standby power amplifier state detection sub-circuit (13) is used for outputting a second state level signal according to the working state of the standby power amplifier circuit;
the control sub-circuit (12) is used for controlling the working state of the driving sub-circuit (14) according to the first state level signal and the second state level signal so as to control the on-off state of the coil of the relay (15), wherein when the main power amplification circuit is in a fault state and the standby power amplification circuit is in an idle state, the driving sub-circuit (14) is controlled to be switched to the working state, and the coil of the relay (15) is electrified.
2. The standby power amplifier switching circuit according to claim 1, wherein the main power amplifier failure detection sub-circuit (11) comprises a first micro-control chip (111), a first resistor R1, a second resistor R2, and a transistor Q1;
the watchdog signal input end of the first micro-control chip (111) is connected with the main power discharge circuit, and the watchdog signal output end of the first micro-control chip (111) is connected with the base electrode of the triode Q1;
the base of the triode Q1 is connected with the power supply through the first resistor R1, the collector of the triode Q1 is connected with the power supply through the second resistor R2, and the emitter of the triode Q1 is constructed as the signal output end of the main power amplifier fault detection sub-circuit (11) and is connected with the first signal input end of the control sub-circuit (12);
the first microcontroller chip (111) is configured to turn on the transistor Q1 if the main power discharge circuit is in a fault state.
3. The standby power amplifier switching circuit according to claim 1, wherein the standby power amplifier state detection sub-circuit (13) comprises a third resistor R3, a fourth resistor R4 and a first optical coupler (131);
the anode of the first optical coupler (131) is connected with the anode output end of the standby power amplifier circuit through the third resistor R3, and the cathode of the first optical coupler (131) is connected with the cathode output end of the standby power amplifier circuit;
the emitter of the first optical coupler (131) is connected with the second signal end of the control sub-circuit (12), and the collector of the first optical coupler (131) is connected with a power supply;
the emitter of the first optocoupler (131) is connected to ground via the fourth resistor R4;
the first optical coupler (131) is configured to conduct when the backup power amplifier circuit is in a non-operational state.
4. The standby power amplifier switching circuit according to claim 1, wherein the driving sub-circuit (14) comprises a second optocoupler (141), a fifth resistor R5, a sixth resistor R6, and a diode D1;
wherein the anode of the second optical coupler (141) is connected with the signal output end of the control sub-circuit (12) through the fifth resistor R5, and the cathode of the second optical coupler (141) is grounded;
the emitter of the second optical coupler (141) is connected with the first end of the coil of the relay (15), and the collector of the second optical coupler (141) is connected with a power supply through the sixth resistor R6;
the cathode of the diode D1 is connected with the first end of the coil of the relay (15), the anode of the diode D1 is connected with the second end of the coil of the relay (15), and the second end of the coil is grounded;
the second optocoupler (141) is configured to be switched on when receiving a high-level signal of the control sub-circuit (12), and the coil of the relay (15) is energized when the second optocoupler (141) is in a switched-on state.
5. The standby power amplifier switching circuit according to claim 4, wherein the driving sub-circuit (14) further comprises a Light Emitting Diode (LED) and a seventh resistor R7;
wherein the anode of the light emitting diode LED is connected with the first end of the seventh resistor R7, the cathode of the light emitting diode LED is grounded, and the second end of the seventh resistor R7 is connected with the emitter of the second optical coupler (141);
the light emitting diode LED is configured to emit light when the coil of the relay (15) is energized.
6. The standby power amplifier switching circuit according to claim 4 or 5, wherein the driving sub-circuit (14) further comprises a zener diode D2;
the anode of the zener diode D2 is connected to the cathode of the diode D1, and the cathode of the zener diode D2 is connected to the end of the sixth resistor R6 away from the power supply.
7. The standby power amplifier switching circuit according to claim 1, wherein the control sub-circuit (12) comprises a second micro-control chip (121) and a nand gate (122);
wherein the non-inverting input of the NAND gate (122) is designed as a first signal input of the control sub-circuit (12);
the inverting input of the NAND gate (122) is designed as a second signal input of the control sub-circuit (12);
the data input end of the second micro control chip (121) is connected with the output end of the NAND gate (122);
the signal output of the second microcontroller chip (121) is designed as a signal output of the control sub-circuit (12);
the second microcontroller chip (121) is configured to output a control signal from the signal output in the event that the data input receives a target level signal, the control signal being used to control the driver sub-circuit (14) to switch to an operating state.
8. A method for switching a standby power amplifier is characterized by comprising the following steps:
detecting the fault state of the main power amplifier circuit through a main power amplifier fault detection sub-circuit, and outputting a first state level signal;
detecting the working state of the standby power amplifier circuit through the standby power amplifier state detection sub-circuit and outputting a second state level signal;
and controlling the working state of a driving sub-circuit through a control sub-circuit based on the first state level signal and the second state level signal so as to control the power on/off state of a coil of the relay, wherein the driving sub-circuit is controlled to be switched to the working state and the coil of the relay is electrified under the condition that the main power amplifier circuit is in a fault state and the standby power amplifier circuit is in an idle state.
9. The method of claim 8, wherein controlling the on/off state of the coil of the relay by controlling the operating state of a driving sub-circuit through a control sub-circuit based on the first state level signal and the second state level signal comprises:
under the condition that the first state level signal is a high level signal and the second state level signal is a high level signal, the driving sub-circuit is controlled to be switched to a working state so as to control the coil of the relay to be electrified, under the condition that the coil of the relay is electrified, the standby power amplifier circuit is conducted with a line of a load, and the main power amplifier circuit is disconnected with the line of the load;
and under the condition that the first state level signal is a low level signal and/or the second state level signal is a low level signal, controlling the driving sub-circuit to be switched to a non-working state so as to control the coil of the relay to be powered off, under the condition that the coil of the relay is powered off, the standby power amplifier circuit is disconnected with the circuit of the load, and the main power amplifier circuit is connected with the circuit of the load.
10. A broadcast system, characterized in that the broadcast system comprises at least one main power amplifier circuit, a standby power amplifier circuit and the standby power amplifier switching circuit of any one of claims 1 to 7.
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| CN202011455406.0A CN112600636B (en) | 2020-12-10 | 2020-12-10 | Standby power amplifier switching circuit and method and broadcasting system |
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| CN117834066A (en) * | 2023-12-22 | 2024-04-05 | 广州市迪士普音响科技有限公司 | Automatic switching method and system of main and standby power amplifiers, electronic equipment and medium |
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| US8829998B2 (en) * | 2012-10-23 | 2014-09-09 | Airspan Networks Inc. | Doherty power amplifier |
| CN104393943A (en) * | 2013-11-20 | 2015-03-04 | 广州市保伦电子有限公司 | Emergency voice broadcast evacuation system |
| CN204089781U (en) * | 2014-10-12 | 2015-01-07 | 咸阳直标机电设备有限公司 | A kind of PDM standard double-core medium wave broadcast transmitter |
| CN206272834U (en) * | 2016-08-29 | 2017-06-20 | 天津渤海奥立电子有限公司 | Power amplifier handover module |
| CN111901728A (en) * | 2020-08-05 | 2020-11-06 | 广州市迪士普音响科技有限公司 | Frequency selection circuit and power amplifier switching system |
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Address after: 100040 Room 203, building 5, 13 Fuqian 1st Street, Tianzhu District, Shunyi District, Beijing Patentee after: Beijing Urban Construction Intelligent Control Technology Co.,Ltd. Address before: 100040 Room 203, building 5, 13 Fuqian 1st Street, Tianzhu District, Shunyi District, Beijing Patentee before: BEIJING URBAN CONSTRUCTION INTELLIGENT CONTROL TECHNOLOGY Co.,Ltd. |