CN221553109U - Power supply circuit and fire emergency broadcasting system - Google Patents
Power supply circuit and fire emergency broadcasting system Download PDFInfo
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- CN221553109U CN221553109U CN202420036550.8U CN202420036550U CN221553109U CN 221553109 U CN221553109 U CN 221553109U CN 202420036550 U CN202420036550 U CN 202420036550U CN 221553109 U CN221553109 U CN 221553109U
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Abstract
The utility model discloses a power supply circuit and audio equipment, which comprises a first power supply conversion circuit, a second power supply conversion circuit, a third power supply conversion circuit, a fourth power supply conversion circuit and a fifth power supply conversion circuit; the first power supply conversion circuit, the second power supply conversion circuit and the third power supply conversion circuit are electrically connected in sequence; the third power supply conversion circuit is used for outputting +/-5V reference voltage; the input end of the fourth power conversion circuit is electrically connected with the output end of the third power conversion circuit, and the output end of the fourth power conversion circuit is connected with the input end of the fifth power conversion circuit. The power supply circuit can realize power supply of the audio power amplifier, and has the advantages of simple circuit structure, low failure rate, strong universality of elements and high utilization rate.
Description
Technical Field
The utility model relates to the technical field of audio equipment, in particular to a power supply circuit and a fire emergency broadcasting system.
Background
Emergency broadcast circuitry in a fire emergency broadcast system requires power to an audio power amplifier. In the application process of the audio power amplifier, the output power of the audio power amplifier is limited by the output voltage of a power supply of the audio power amplifier, and a boost type direct current-to-direct current (English can be expressed as DC-DC) circuit or a Charge Pump (English can be expressed as Charge-Pump) circuit is generally used as the power supply circuit of the audio power amplifier. The power supply circuit can increase the power supply voltage of the audio power amplifier so as to achieve the purpose of increasing the output signal amplitude of the audio power amplifier and further increasing the output power.
However, in the related art, the power supply circuit of the audio power amplifier needs to be optimized, so that the power supply circuit of the audio power amplifier and other circuits in the audio device are often two independent power supply circuits, which results in complex circuit structure in the whole audio device and high failure rate.
Disclosure of utility model
The utility model provides a power circuit and a fire emergency broadcasting system, which aim to solve the problems of complex power circuit and high failure rate of audio equipment in the prior art.
In order to achieve the above purpose of the present utility model, the following technical scheme is adopted:
A power supply circuit includes a first power supply conversion circuit for converting 220V commercial power into 24V DC power, a second power supply conversion circuit for converting 24V DC power into 12V DC power, a third power supply conversion circuit for converting 12V DC power into + -5V reference voltage, a fourth power supply conversion circuit for converting 12V DC power into 5V DC voltage, and a fifth power supply conversion circuit for converting 5V DC power into 3.3V DC voltage;
The first power supply conversion circuit, the second power supply conversion circuit and the third power supply conversion circuit are electrically connected in sequence;
the third power supply conversion circuit is used for outputting +/-5V reference voltage;
The input end of the fourth power conversion circuit is electrically connected with the output end of the third power conversion circuit, and the output end of the fourth power conversion circuit is connected with the input end of the fifth power conversion circuit.
Preferably, the first power conversion circuit comprises a rectifier bridge, a first filter circuit and a choke coil;
The input end of the rectifier bridge is used for being externally connected with 220V mains supply;
The output end of the rectifier bridge is electrically connected with the first filter circuit and the choke coil in sequence;
the output end of the choke coil outputs 24V direct current.
Further, the first filter circuit comprises a fuse, a diode D1, a diode D3, a capacitor EC1, a capacitor EC2, a capacitor C5 and a gas discharge tube;
One end of the fuse is electrically connected with the positive output end of the rectifier bridge; the other end of the fuse is electrically connected with one end of the diode D1, one end of the capacitor EC2 and the first input end of the choke coil respectively;
The negative output end of the rectifier bridge is respectively and electrically connected with the other end of the diode D1, the other end of the capacitor EC2, one end of the capacitor C5, one end of the diode D3, one end of the gas discharge tube and the second input end of the choke coil;
The other end of the capacitor C5, the other end of the diode D3 and the other end of the gas discharge tube are grounded.
Preferably, the second power conversion circuit includes a second filter circuit, a first DC/DC converter for converting 24V DC power into 12V DC power, a third filter circuit, a capacitor C9, a capacitor C10, a capacitor C11, and a resistor R5;
The VIN pin of the first DC/DC converter is electrically connected with the output end of the first power conversion circuit through the second filter circuit;
The output end of the second filter circuit is electrically connected with the first DC/DC converter and the third filter circuit in sequence;
The output end of the third filter circuit is used as the output end of the second power supply conversion circuit;
The SS pin of the first DC/DC converter is grounded through a capacitor C9;
the DP pin of the first DC/DC converter is grounded;
the COMP pin of the first DC/DC converter is respectively connected with one end of a capacitor C10 and one end of a capacitor C11;
the other end of the capacitor C10 is grounded through a resistor R5;
the other end of the capacitor C11 is grounded and electrically connected to one end of the resistor R5.
Further, the second filter circuit comprises a capacitor C6, a capacitor C7, a capacitor C8, a resistor R2, a resistor R4 and a capacitor C12;
The VIN pin of the first DC/DC converter is electrically connected with one end of the capacitor C6, one end of the capacitor C7, one end of the capacitor C8 and one end of the resistor R2 respectively;
The other end of the capacitor C6, the other end of the capacitor C7 and the other end of the capacitor C8 are connected with each other and grounded;
The other end of the resistor R2 is electrically connected with one end of the resistor R4, one end of the capacitor C12 and an EN pin of the first DC/DC converter respectively;
The EN pin of the first DC/DC converter is electrically connected with one end of the capacitor C12;
the other end of the resistor R4 and the other end of the capacitor C12 are connected with each other and grounded.
Further, the third filter circuit includes a capacitor C1, a diode D2, an inductor L2, a capacitor C3, a capacitor C4, a resistor R1, and a resistor R2;
One end of the capacitor C1 is electrically connected with a BOOT pin of the first DC/DC converter;
The other end of the capacitor C1 is electrically connected with the PH pin of the first DC/DC converter, one end of the diode D2 and one end of the inductor L2 respectively;
The other end of the inductor L2 is used as an output end of the second power supply conversion circuit and is electrically connected with one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4 and one end of the resistor R1 respectively;
The GND pin of the first DC/DC converter is respectively and electrically connected with the other end of the diode D2, the other end of the capacitor C3 and the other end of the capacitor C4, and is grounded;
The VSNS pin of the first DC/DC converter is respectively and electrically connected with the other end of the resistor R1 and one end of the resistor R3;
the other end of the resistor R1 is grounded through a resistor R3.
Preferably, the third power conversion circuit includes a fourth filter circuit, a second DC/DC converter, and a fifth filter circuit;
the input end of the fourth filter circuit is used as the input end of the third power supply conversion circuit;
The output end of the fifth filter circuit is used as the output end of the third power supply conversion circuit and outputs +/-5V reference voltage;
the fourth filter circuit, the second DC/DC converter and the fifth filter circuit are electrically connected in sequence.
Further, the fourth filter circuit comprises a first filter, a capacitor C22 and a capacitor C23;
one end of the first filter is used as an input end of the third power supply conversion circuit;
the other end of the first filter is electrically connected with the VIN pin of the second DC/DC converter;
One end of the first filter is also electrically connected with one end of the capacitor C22 and one end of the capacitor C23 respectively;
The other end of the capacitor C22, the other end of the capacitor C23 and the GND pin of the second DC/DC converter are connected with each other and are grounded.
Further, the fifth filter circuit comprises a capacitor C17, a capacitor C18, a capacitor C27, a capacitor C28, a second filter and a third filter;
One end of the second filter is electrically connected with one end of the capacitor C17, one end of the capacitor C18 and the VOUT3 pin of the second DC/DC converter respectively;
the other end of the second filter is used as a first output end of the third power supply conversion circuit and outputs +5V reference voltage;
The other end of the capacitor C17, the other end of the capacitor C18 and the OV pin of the second DC/DC converter are connected with each other and grounded;
One end of the third filter is electrically connected with one end of the capacitor C27, one end of the capacitor C28 and the VOUT1 pin of the second DC/DC converter respectively;
The other end of the third filter is used as a second output end of the third power supply conversion circuit to output-5V reference voltage;
The other end of the capacitor C27, the other end of the capacitor C28 and the OV pin of the second DC/DC converter are connected with each other and grounded.
An audio device comprises the power supply circuit, an audio power amplifying circuit and an audio player;
The output end of the third power supply conversion circuit is electrically connected with the audio power amplification circuit and provides +/-5V reference voltage for the audio power amplification circuit; the audio power amplifying circuit is in telecommunication electrical connection with the audio player.
The beneficial effects of the utility model are as follows:
the power supply circuit can realize power supply of the audio power amplifier, and has the advantages of simple circuit structure, low failure rate, strong universality of elements and high utilization rate. The power supply circuit provided by the utility model can gradually convert the commercial power into 24V and 12V, and can also convert the 12V into 5V and 3.3V voltages in a fire emergency broadcasting system for other circuit modules to use.
Drawings
Fig. 1 is a schematic block diagram of a power supply circuit according to the present utility model.
Fig. 2 is a schematic circuit connection diagram of the first power conversion circuit according to the present utility model.
Fig. 3 is a schematic circuit connection diagram of the second power conversion circuit according to the present utility model.
Fig. 4 is a schematic circuit connection diagram of a third power conversion circuit according to the present utility model.
Fig. 5 is a schematic circuit connection diagram of the fourth power conversion circuit according to the present utility model.
Fig. 6 is a schematic circuit connection diagram of a fifth power conversion circuit according to the present utility model.
Detailed Description
Further advantages and effects of the present utility model will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.
It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
Example 1
As shown in fig. 1, a power supply circuit includes a first power supply conversion circuit for converting 220V commercial power into 24V direct current, a second power supply conversion circuit for converting 24V direct current into 12V direct current, a third power supply conversion circuit for converting 12V direct current into ±5V reference voltage, a fourth power supply conversion circuit for converting 12V direct current into 5V direct current voltage, and a fifth power supply conversion circuit for converting 5V direct current into 3.3V direct current voltage;
The first power supply conversion circuit, the second power supply conversion circuit and the third power supply conversion circuit are electrically connected in sequence;
the third power supply conversion circuit is used for outputting +/-5V reference voltage;
The input end of the fourth power conversion circuit is electrically connected with the output end of the third power conversion circuit, and the output end of the fourth power conversion circuit is connected with the input end of the fifth power conversion circuit.
The power supply circuit can realize power supply of the audio power amplifier, and has the advantages of simple circuit structure, low failure rate, strong universality of elements and high utilization rate. The power supply circuit provided by the utility model can gradually convert the commercial power into 24V and 12V, and can convert the 24V and 12V into other voltages for other circuit modules in audio equipment.
In a specific embodiment, as shown in fig. 2, the first power conversion circuit includes a rectifier bridge, a first filter circuit, and a choke coil;
The input end of the rectifier bridge is used for being externally connected with 220V mains supply;
The output end of the rectifier bridge is electrically connected with the first filter circuit and the choke coil in sequence;
the output end of the choke coil outputs 24V direct current.
In this embodiment, the rectifier bridge may be of model DB207S; the choke may be of the type ACM4520-231-2P-T000.
In this embodiment, the first filter circuit includes a fuse, a diode D1, a diode D3, a capacitor EC1, a capacitor EC2, a capacitor C5, and a gas discharge tube;
One end of the fuse is electrically connected with the positive output end of the rectifier bridge; the other end of the fuse is electrically connected with one end of the diode D1, one end of the capacitor EC2 and the first input end of the choke coil respectively;
The negative output end of the rectifier bridge is respectively and electrically connected with the other end of the diode D1, the other end of the capacitor EC2, one end of the capacitor C5, one end of the diode D3, one end of the gas discharge tube and the second input end of the choke coil;
The other end of the capacitor C5, the other end of the diode D3 and the other end of the gas discharge tube are grounded.
As shown in fig. 2, the present embodiment further provides a first prompting circuit including a resistor R6 and a light emitting diode D4. Specifically, a resistor R6 and a light emitting diode D4 are sequentially connected to the first output end of the choke coil. When the fuse is operating normally, the light emitting diode D4 emits light. When the fuse is blown, the light emitting diode D4 does not emit light, and thus it is possible to provide whether the first power conversion circuit is in normal operation.
In a specific embodiment, as shown in fig. 3, the second power conversion circuit includes a second filter circuit, a first DC/DC converter for converting 24V DC power into 12V DC power, a third filter circuit, a capacitor C9, a capacitor C10, a capacitor C11, and a resistor R5;
The VIN pin of the first DC/DC converter is electrically connected with the output end of the first power conversion circuit through the second filter circuit;
The output end of the second filter circuit is electrically connected with the first DC/DC converter and the third filter circuit in sequence;
The output end of the third filter circuit is used as the output end of the second power supply conversion circuit;
The SS pin of the first DC/DC converter is grounded through a capacitor C9;
the DP pin of the first DC/DC converter is grounded;
the COMP pin of the first DC/DC converter is respectively connected with one end of a capacitor C10 and one end of a capacitor C11;
the other end of the capacitor C10 is grounded through a resistor R5;
the other end of the capacitor C11 is grounded and electrically connected to one end of the resistor R5.
The first DC/DC converter may be of the type TPS54331DDAR.
In this embodiment, the second filter circuit includes a capacitor C6, a capacitor C7, a capacitor C8, a resistor R2, a resistor R4, and a capacitor C12;
The VIN pin of the first DC/DC converter is electrically connected with one end of the capacitor C6, one end of the capacitor C7, one end of the capacitor C8 and one end of the resistor R2 respectively;
The other end of the capacitor C6, the other end of the capacitor C7 and the other end of the capacitor C8 are connected with each other and grounded;
The other end of the resistor R2 is electrically connected with one end of the resistor R4, one end of the capacitor C12 and an EN pin of the first DC/DC converter respectively;
The EN pin of the first DC/DC converter is electrically connected with one end of the capacitor C12;
the other end of the resistor R4 and the other end of the capacitor C12 are connected with each other and grounded.
In this embodiment, the third filter circuit includes a capacitor C1, a diode D2, an inductor L2, a capacitor C3, a capacitor C4, a resistor R1, and a resistor R2;
One end of the capacitor C1 is electrically connected with a BOOT pin of the first DC/DC converter;
The other end of the capacitor C1 is electrically connected with the PH pin of the first DC/DC converter, one end of the diode D2 and one end of the inductor L2 respectively;
The other end of the inductor L2 is used as an output end of the second power supply conversion circuit and is electrically connected with one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4 and one end of the resistor R1 respectively;
The GND pin of the first DC/DC converter is respectively and electrically connected with the other end of the diode D2, the other end of the capacitor C3 and the other end of the capacitor C4, and is grounded;
The VSNS pin of the first DC/DC converter is respectively and electrically connected with the other end of the resistor R1 and one end of the resistor R3;
the other end of the resistor R1 is grounded through a resistor R3.
In a specific embodiment, as shown in fig. 4, the third power conversion circuit includes a fourth filter circuit, a second DC/DC converter, and a fifth filter circuit;
the input end of the fourth filter circuit is used as the input end of the third power supply conversion circuit;
The output end of the fifth filter circuit is used as the output end of the third power supply conversion circuit and outputs +/-5V reference voltage;
the fourth filter circuit, the second DC/DC converter and the fifth filter circuit are electrically connected in sequence.
The signal of the second DC/DC converter may be A1205XT-1WR3.
Further, the fourth filter circuit comprises a first filter, a capacitor C22 and a capacitor C23;
one end of the first filter is used as an input end of the third power supply conversion circuit;
the other end of the first filter is electrically connected with the VIN pin of the second DC/DC converter;
One end of the first filter is also electrically connected with one end of the capacitor C22 and one end of the capacitor C23 respectively;
The other end of the capacitor C22, the other end of the capacitor C23 and the GND pin of the second DC/DC converter are connected with each other and are grounded.
The model of the first filter may be MPZ2012S221ATD25.
As shown in fig. 4, the fifth filter circuit includes a capacitor C17, a capacitor C18, a capacitor C27, a capacitor C28, a second filter, and a third filter;
One end of the second filter is electrically connected with one end of the capacitor C17, one end of the capacitor C18 and the VOUT3 pin of the second DC/DC converter respectively;
the other end of the second filter is used as a first output end of the third power supply conversion circuit and outputs +5V reference voltage;
The other end of the capacitor C17, the other end of the capacitor C18 and the OV pin of the second DC/DC converter are connected with each other and grounded;
One end of the third filter is electrically connected with one end of the capacitor C27, one end of the capacitor C28 and the VOUT1 pin of the second DC/DC converter respectively;
The other end of the third filter is used as a second output end of the third power supply conversion circuit to output-5V reference voltage;
The other end of the capacitor C27, the other end of the capacitor C28 and the OV pin of the second DC/DC converter are connected with each other and grounded.
The second filter and the third filter in this embodiment may be of the type
MPZ2012S221ATD25。
In this embodiment, the circuit connection of the third power conversion circuit is shown in fig. 5, the circuit connection of the fourth power conversion circuit is shown in fig. 6,
Those skilled in the art can directly obtain the detailed connection relation of the circuits from fig. 5 and 6, and will not be explained here.
Example 2
Based on the power supply circuit provided in embodiment 1, the present embodiment also provides an audio device including the power supply circuit, the audio power amplifying circuit, and the audio player described in embodiment 1;
The output end of the third power supply conversion circuit is electrically connected with the audio power amplification circuit and provides +/-5V reference voltage for the audio power amplification circuit; the audio power amplifying circuit is in telecommunication electrical connection with the audio player.
The audio power amplifying circuit in this embodiment may be an existing audio power amplifying circuit, and the present embodiment does not involve a circuit improvement of the audio power amplifying circuit, so a circuit description of the audio power amplifying circuit will not be provided in detail herein.
The audio player includes one or more of headphones, a broadcast, a DVD player, and the like.
The 12V conversion bit 5V and 3.3V voltage can be used for other circuit modules in the fire emergency broadcasting system, such as a main controller in the fire emergency broadcasting system and the like.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. A power supply circuit, characterized by: the power supply circuit comprises a first power supply conversion circuit for converting 220V commercial power into 24V direct current, a second power supply conversion circuit for converting 24V direct current into 12V direct current, a third power supply conversion circuit for converting 12V direct current into +/-5V reference voltage, a fourth power supply conversion circuit for converting 12V direct current into 5V direct current voltage, and a fifth power supply conversion circuit for converting 5V direct current into 3.3V direct current voltage;
The first power supply conversion circuit, the second power supply conversion circuit and the third power supply conversion circuit are electrically connected in sequence;
the third power supply conversion circuit is used for outputting +/-5V reference voltage;
The input end of the fourth power conversion circuit is electrically connected with the output end of the third power conversion circuit, and the output end of the fourth power conversion circuit is connected with the input end of the fifth power conversion circuit.
2. The power supply circuit of claim 1, wherein: the first power supply conversion circuit comprises a rectifier bridge, a first filter circuit and a choke coil;
The input end of the rectifier bridge is used for being externally connected with 220V mains supply;
The output end of the rectifier bridge is electrically connected with the first filter circuit and the choke coil in sequence;
the output end of the choke coil outputs 24V direct current.
3. The power supply circuit of claim 2, wherein: the first filter circuit comprises a fuse, a diode D1, a diode D3, a capacitor EC1, a capacitor EC2, a capacitor C5 and a gas discharge tube;
One end of the fuse is electrically connected with the positive output end of the rectifier bridge; the other end of the fuse is electrically connected with one end of the diode D1, one end of the capacitor EC2 and the first input end of the choke coil respectively;
The negative output end of the rectifier bridge is respectively and electrically connected with the other end of the diode D1, the other end of the capacitor EC2, one end of the capacitor C5, one end of the diode D3, one end of the gas discharge tube and the second input end of the choke coil;
The other end of the capacitor C5, the other end of the diode D3 and the other end of the gas discharge tube are grounded.
4. The power supply circuit of claim 1, wherein: the second power supply conversion circuit comprises a second filter circuit, a first DC/DC converter for converting 24V direct current into 12V direct current, a third filter circuit, a capacitor C9, a capacitor C10, a capacitor C11 and a resistor R5;
The VIN pin of the first DC/DC converter is electrically connected with the output end of the first power conversion circuit through the second filter circuit;
The output end of the second filter circuit is electrically connected with the first DC/DC converter and the third filter circuit in sequence;
The output end of the third filter circuit is used as the output end of the second power supply conversion circuit;
The SS pin of the first DC/DC converter is grounded through a capacitor C9;
the DP pin of the first DC/DC converter is grounded;
the COMP pin of the first DC/DC converter is respectively connected with one end of a capacitor C10 and one end of a capacitor C11;
the other end of the capacitor C10 is grounded through a resistor R5;
the other end of the capacitor C11 is grounded and electrically connected to one end of the resistor R5.
5. The power supply circuit of claim 4, wherein: the second filter circuit comprises a capacitor C6, a capacitor C7, a capacitor C8, a resistor R2, a resistor R4 and a capacitor C12;
The VIN pin of the first DC/DC converter is electrically connected with one end of the capacitor C6, one end of the capacitor C7, one end of the capacitor C8 and one end of the resistor R2 respectively;
The other end of the capacitor C6, the other end of the capacitor C7 and the other end of the capacitor C8 are connected with each other and grounded;
The other end of the resistor R2 is electrically connected with one end of the resistor R4, one end of the capacitor C12 and an EN pin of the first DC/DC converter respectively;
The EN pin of the first DC/DC converter is electrically connected with one end of the capacitor C12;
the other end of the resistor R4 and the other end of the capacitor C12 are connected with each other and grounded.
6. The power supply circuit of claim 4, wherein: the third filter circuit comprises a capacitor C1, a diode D2, an inductor L2, a capacitor C3, a capacitor C4, a resistor R1 and a resistor R2;
One end of the capacitor C1 is electrically connected with a BOOT pin of the first DC/DC converter;
The other end of the capacitor C1 is electrically connected with the PH pin of the first DC/DC converter, one end of the diode D2 and one end of the inductor L2 respectively;
The other end of the inductor L2 is used as an output end of the second power supply conversion circuit and is electrically connected with one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4 and one end of the resistor R1 respectively;
The GND pin of the first DC/DC converter is respectively and electrically connected with the other end of the diode D2, the other end of the capacitor C3 and the other end of the capacitor C4, and is grounded;
The VSNS pin of the first DC/DC converter is respectively and electrically connected with the other end of the resistor R1 and one end of the resistor R3;
the other end of the resistor R1 is grounded through a resistor R3.
7. The power supply circuit of claim 1, wherein: the third power supply conversion circuit comprises a fourth filter circuit, a second DC/DC converter and a fifth filter circuit;
the input end of the fourth filter circuit is used as the input end of the third power supply conversion circuit;
The output end of the fifth filter circuit is used as the output end of the third power supply conversion circuit and outputs +/-5V reference voltage;
the fourth filter circuit, the second DC/DC converter and the fifth filter circuit are electrically connected in sequence.
8. The power supply circuit of claim 7, wherein: the fourth filter circuit comprises a first filter, a capacitor C22 and a capacitor C23;
one end of the first filter is used as an input end of the third power supply conversion circuit;
the other end of the first filter is electrically connected with the VIN pin of the second DC/DC converter;
One end of the first filter is also electrically connected with one end of the capacitor C22 and one end of the capacitor C23 respectively;
The other end of the capacitor C22, the other end of the capacitor C23 and the GND pin of the second DC/DC converter are connected with each other and are grounded.
9. The power supply circuit of claim 7, wherein: the fifth filter circuit comprises a capacitor C17, a capacitor C18, a capacitor C27, a capacitor C28, a second filter and a third filter;
One end of the second filter is electrically connected with one end of the capacitor C17, one end of the capacitor C18 and the VOUT3 pin of the second DC/DC converter respectively;
the other end of the second filter is used as a first output end of the third power supply conversion circuit and outputs +5V reference voltage;
The other end of the capacitor C17, the other end of the capacitor C18 and the OV pin of the second DC/DC converter are connected with each other and grounded;
One end of the third filter is electrically connected with one end of the capacitor C27, one end of the capacitor C28 and the VOUT1 pin of the second DC/DC converter respectively;
The other end of the third filter is used as a second output end of the third power supply conversion circuit to output-5V reference voltage;
The other end of the capacitor C27, the other end of the capacitor C28 and the OV pin of the second DC/DC converter are connected with each other and grounded.
10. A fire emergency broadcast system, characterized in that: comprising a power supply circuit, an audio power amplifying circuit, an audio player according to any of claims 1-9;
The output end of the third power supply conversion circuit is electrically connected with the audio power amplification circuit and provides +/-5V reference voltage for the audio power amplification circuit; the audio power amplifying circuit is in telecommunication electrical connection with the audio player.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420036550.8U CN221553109U (en) | 2024-01-05 | 2024-01-05 | Power supply circuit and fire emergency broadcasting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420036550.8U CN221553109U (en) | 2024-01-05 | 2024-01-05 | Power supply circuit and fire emergency broadcasting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221553109U true CN221553109U (en) | 2024-08-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202420036550.8U Active CN221553109U (en) | 2024-01-05 | 2024-01-05 | Power supply circuit and fire emergency broadcasting system |
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| CN (1) | CN221553109U (en) |
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2024
- 2024-01-05 CN CN202420036550.8U patent/CN221553109U/en active Active
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