CN106787838A - Power circuits and audio equipment - Google Patents

Abstract

The invention discloses a power supply circuit. The power supply circuit includes an isolation transformer and a detection circuit. The primary end of the isolation transformer is used for connecting an external power supply. The isolation transformer is used for carrying out voltage reduction isolation processing on an external power supply. The detection circuit is connected with the secondary end of the isolation transformer. The detection circuit comprises a judgment module. The judging module is used for judging whether the external power supply is a high-voltage power supply or a low-voltage power supply according to the voltage output by the secondary end of the isolation transformer. The power supply circuit of the embodiment of the invention judges whether the external power supply is a high-voltage power supply or a low-voltage power supply through the detection circuit, thereby being capable of configuring different power supply design parameters. Meanwhile, the detection circuit is not directly connected with an external power supply, safety is guaranteed, and the detection circuit can work in a low-voltage state, so that power consumption is reduced. In addition, the invention also discloses audio equipment.

Description

Power circuits and audio equipment

technical field

The invention relates to the technical field of electronic circuits, in particular to a power supply circuit and audio equipment.

Background technique

In related technologies, a bidirectional switch is generally provided outside the device, and the bidirectional switch is used to inform the device whether the current input voltage of the power supply is a high voltage, such as 220V or a low voltage, such as 110V. When the two-way switch is toggled to one side, the device works with the power input voltage as high voltage, and when the two-way switch is toggled to the other side, the device works with the power input voltage as low voltage. However, this method of manually toggling the two-way switch has the risk of human error, resulting in abnormal operation of the equipment and even damage to electronic devices of some equipment.

Contents of the invention

Embodiments of the present invention provide a power supply circuit and audio equipment.

The power supply circuit of the embodiment of the present invention includes:

an isolation transformer, the primary end of the isolation transformer is used to connect to an external power supply, and the isolation transformer is used to step down and isolate the external power supply; and

A detection circuit, the detection circuit is connected to the secondary end of the isolation transformer, the detection circuit includes a judgment module, and the judgment module is used to judge that the external power supply is a high voltage according to the voltage output by the secondary end of the isolation transformer mains or low voltage power supply.

An audio device of an embodiment of the present invention includes a power supply circuit of an embodiment of the present invention.

The power supply circuit and the audio equipment in the embodiment of the present invention determine whether the external power supply is a high-voltage power supply or a low-voltage power supply through the detection circuit, so that different power supply design parameters can be configured. At the same time, the detection circuit is not directly connected to an external power supply, which ensures safety, and the detection circuit can work in a low-voltage state, reducing power consumption.

Additional aspects and advantages of embodiments of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and understandable from the description of the embodiments in conjunction with the following drawings, wherein:

FIG. 1 is a schematic diagram of functional modules of a power supply circuit according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the functional modules of the judging module according to the embodiment of the present invention.

Fig. 3 is a schematic diagram of functional modules of a judging module according to another embodiment of the present invention.

Fig. 4 is a schematic diagram of functional modules of a judging module in another embodiment of the present invention.

Description of main components and symbols:

Power supply circuit 10, isolation transformer 12, detection circuit 14, judging module 141, comparator 1411, first judging unit 1412, shunt regulator 1413, second judging unit 1414, voltage dividing unit 1415, third judging unit 1416, An analog-to-digital conversion circuit 14162 , a rectification module 142 , a filter module 143 , a reference voltage supply module 144 , a control module 145 , and an external power supply 20 .

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, are only for explaining the embodiments of the present invention, and should not be construed as limiting the embodiments of the present invention.

Referring to FIG. 1 , a power supply circuit 10 according to an embodiment of the present invention includes an isolation transformer 12 and a detection circuit 14 . The primary end of the isolation transformer 12 is used to connect to an external power source 20 . The isolation transformer 12 is used for performing step-down isolation processing on the external power supply 20 . The detection circuit 14 is connected to the secondary end of the isolation transformer 12 . The detection circuit 14 includes a judging module 141 . The judging module 141 is used for judging whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply according to the output voltage of the secondary terminal of the isolation transformer 12 .

The power supply circuit 10 in the embodiment of the present invention judges whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply through the detection circuit 14, so that different power supply design parameters can be configured. At the same time, the detection circuit 14 is not directly connected to the external power supply 20 to ensure safety, and the detection circuit 14 can work in a low-voltage state to reduce power consumption.

In one example, the external power supply 20 may be a grid, the high voltage power supply is 220V power supply, and the low voltage power supply is 110V power supply.

In some embodiments, the detection circuit 14 includes a rectification module 142 . The judging module 141 is connected to the secondary end of the isolation transformer 12 through the rectifying module 142 . The rectification module 142 is used to convert the AC signal output by the isolation transformer 12 into a DC signal and output the DC signal to the judging module 141 .

In this way, converting the AC signal output by the isolation transformer 12 into a DC signal is beneficial for the judging module 141 to compare voltages to judge whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply.

In some embodiments, the rectification module 142 includes a silicon bridge circuit.

Specifically, the rectification module 142 may adopt a full-wave rectification circuit composed of a silicon bridge circuit. When the rectifier module 142 includes a silicon bridge circuit, two input terminals of the silicon bridge circuit are connected to the secondary terminal of the isolation transformer 12, one output terminal of the silicon bridge circuit is connected to the judging module 141, and the other output terminal of the silicon bridge circuit is grounded.

In some embodiments, the detection circuit 14 includes a filtering module 143 . The filtering module 143 is connected to the rectifying module 142 and the judging module 141 . The filter module 143 is used to filter out the interference signal in the DC signal.

In this way, filtering out the interference signal in the DC signal output by the rectification module 142 is beneficial for the judging module 141 to compare the voltages to judge whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply, and make the judging result more accurate.

In some implementations, the filter module 143 includes a filter capacitor.

Specifically, one end of the filter capacitor is connected to the rectification module 142 and the judgment module 141 , and the other end of the filter capacitor is grounded. More specifically, when the rectification module 142 includes a silicon bridge circuit, one end of the filter capacitor is connected to an output end of the silicon bridge circuit.

Referring to FIG. 1 and FIG. 2 , in some implementations, the judging module 141 includes a comparator 1411 and a first judging unit 1412 . The comparator 1411 is connected to the rectification module 142 . The detection circuit 14 includes a reference voltage supply module 144 . The reference voltage providing module 144 is used for providing a reference voltage. The comparator 1411 is used for comparing the voltage of the DC signal with a reference voltage and outputting a comparison signal. The first judging unit 1412 is used for judging whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply according to the comparison signal.

In an example, the first judging unit 1412 may be an MCU (Microcontroller Unit, micro control unit).

In one example, the reference voltage supply module 144 is connected to the non-inverting input terminal of the comparator 1411 , and the output terminal of the rectification module 142 is connected to the inverting input terminal of the comparator 1411 . When the voltage of the non-inverting input terminal of the comparator 1411 is lower than the voltage of the inverting input terminal, that is, when the voltage of the DC signal is higher than the reference voltage, the comparator 1411 outputs a low-level signal, and the first judging unit 1412 judges that the external power supply 20 is a high voltage power supply. When the voltage of the non-inverting input terminal of the comparator 1411 is higher than the voltage of the inverting input terminal, that is, when the voltage of the DC signal is lower than the reference voltage, the comparator 1411 outputs a high-level signal, and the first judging unit 1412 judges that the external power supply 20 is low voltage power supply.

Of course, in other examples, the reference voltage supply module 144 may be connected to the inverting input terminal of the comparator 1411 , and the output terminal of the rectification module 142 is connected to the non-inverting input terminal of the comparator 1411 . Similarly, when the voltage of the DC signal is higher than the reference voltage, the comparator 1411 outputs a high-level signal, and the first judging unit 1412 judges that the external power supply 20 is a high-voltage power supply. Here, it will not be expanded in detail.

In one example, the reference voltage supply module 144 can be a bias power supply. A bias supply is used to provide a reference voltage.

Please refer to FIG. 3 , in some implementations, the judging module 141 includes a shunt regulator 1413 and a second judging unit 1414 . The shunt regulator 1413 is connected to the rectification module 142 . The second judging unit 1414 is used for judging that the external power supply 20 is a high voltage power supply when the voltage of the DC signal is higher than the conduction voltage of the shunt regulator 1413 . The second judging unit 1414 is used for judging that the external power supply 20 is a low-voltage power supply when the voltage of the DC signal is lower than the conduction voltage of the shunt regulator 1413 .

In an example, the second judging unit 1414 may be an MCU.

In one example, the shunt regulator 1413 can be a TL431.

Please refer to FIG. 1 again, in some embodiments, the detection circuit 14 includes a control module 145 connected to the judgment module 141 . The control module 145 is used to make the electrical equipment connected to the secondary end of the isolation transformer 12 work in different voltage states when the external power supply 20 is a high-voltage power supply or a low-voltage power supply.

Specifically, the secondary end of the isolation transformer 12 may include multiple secondary windings to provide different output DC voltages. Some of the secondary windings are used to connect electrical equipment, and the detection circuit 14 in the embodiment of the present invention can be connected to only one of the secondary windings. The detection circuit 14 judges whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply, so as to configure different power supply design parameters for the electrical equipment to ensure the normal operation of the electrical equipment.

In one example, the control module 145 can be an MCU.

Please refer to FIG. 4 , in some implementations, the judging module 141 includes a voltage dividing unit 1415 and a third judging unit 1416, the third judging unit 1416 includes an analog-to-digital conversion circuit 14162, and the voltage dividing unit 1415 is connected to the analog-to-digital conversion circuit 14162, The voltage dividing unit 1415 is used to adjust the input voltage of the analog-to-digital conversion circuit 14162, the analog-to-digital conversion circuit 14162 is used to convert the DC signal output by the rectification module 142 into a voltage value, and the third judging unit 1416 is used to judge the external power supply 20 according to the voltage value For high voltage power supply or low voltage power supply.

In an example, the third judging unit 1416 may be an MCU.

Specifically, after the voltage of the DC signal output by the rectification module 142 is divided by the voltage dividing unit 1415, it is input to the analog-to-digital conversion circuit 14162 and converted into a voltage value, and the third judging unit 1416 judges that the external power supply 20 is a high-voltage power supply according to the voltage value or low voltage power supply. For example, when the voltage value is equal to the first value, the third determination unit 1416 determines that the external power supply 20 is a high voltage power supply, and when the voltage value is equal to the second value, the third determination unit 1416 determines that the external power supply 20 is a low voltage power supply.

In some embodiments, when the judging module 141 includes a judging unit (such as the first judging unit 1412, the second judging unit 1414 and/or the third judging unit 1416), the judging unit can be integrated with the control module 145 in the MCU , so as to improve the integration degree of the power supply circuit 10 and reduce the cost.

An audio device according to an embodiment of the present invention includes the power supply circuit 10 according to any one of the above embodiments.

The audio equipment in the embodiment of the present invention judges whether the external power supply 20 is a high-voltage power supply or a low-voltage power supply through the detection circuit 14, so that different power supply design parameters can be configured. At the same time, the detection circuit 14 is not directly connected to the external power supply 20 to ensure safety, and the detection circuit 14 can work in a low-voltage state to reduce power consumption.

Specifically, audio equipment can be, but not limited to, audio equipment such as power amplifiers, speakers, multimedia consoles, digital mixers, audio sampling cards, synthesizers, mid-high frequency speakers, microphones, sound cards in PCs, earphones, and DVD playback equipment. .

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of said features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the description of the embodiments of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a It is a detachable connection, or an integral connection; it can be mechanically connected, it can be electrically connected, or it can communicate with each other; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components or two components interaction relationship. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present invention according to specific situations.

The above disclosure provides many different embodiments or examples for implementing different structures of embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, the components and arrangements of specific examples are described above. Of course, they are merely examples and are not intended to limit the invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or reference letters in different instances, such repetition is for simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed. . In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize the use of other processes and/or the use of other materials.

In the description of this specification, reference to the terms "one embodiment", "certain embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" etc. A specific feature, structure, material, or characteristic described in an embodiment or an example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method descriptions in flowcharts or otherwise described herein may be understood to represent modules, segments or portions of code comprising one or more executable instructions for implementing specific logical functions or steps of the process , and the scope of preferred embodiments of the invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including substantially concurrently or in reverse order depending on the functions involved, which shall It is understood by those skilled in the art to which the embodiments of the present invention pertain.

The logic and/or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium, For use with instruction execution systems, devices, or devices (such as computer-based systems, systems including processing modules, or other systems that can fetch instructions from instruction execution systems, devices, or devices and execute instructions), or in conjunction with these instruction execution systems, devices or equipment used. For the purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use in or in conjunction with an instruction execution system, device or device. More specific examples (non-exhaustive list) of computer-readable media include the following: electrical connection with one or more wires (electronic device), portable computer disk case (magnetic device), random access memory (RAM), Read Only Memory (ROM), Erasable and Editable Read Only Memory (EPROM or Flash Memory), Fiber Optic Devices, and Portable Compact Disc Read Only Memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program can be printed, since the program can be read, for example, by optically scanning the paper or other medium, followed by editing, interpretation or other suitable processing if necessary. processing to obtain the program electronically and store it in computer memory.

It should be understood that each part of the embodiments of the present invention may be implemented by hardware, software, firmware or a combination thereof. In the embodiments described above, various steps or methods may be implemented by software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented by any one or combination of the following techniques known in the art: Discrete logic circuits, ASICs with suitable combinational logic gates, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

Those of ordinary skill in the art can understand that all or part of the steps carried by the methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. During execution, one or a combination of the steps of the method embodiments is included.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing module, each unit may exist separately physically, or two or more units may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules. If the integrated modules are realized in the form of software function modules and sold or used as independent products, they can also be stored in a computer-readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, and the like.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. a kind of power circuit, it is characterised in that including：

Isolating transformer, the primary side of the isolating transformer is used to connect external power source, and the isolating transformer is used for institute Stating external power source carries out step-down isolation processing；With

Detection circuit, the detection circuit connects the secondary end of the isolating transformer, and the detection circuit includes judge module, The voltage that the judge module is used to be exported according to the secondary end of the isolating transformer judges that the external power source is high-tension electricity Source or low-tension supply.

2. power circuit as claimed in claim 1, it is characterised in that the detection circuit includes rectification module, the judgement Module connects the secondary end of the isolating transformer by the rectification module, and the rectification module is used for the isolation transformation The AC signal of device output is converted to direct current signal and by the DC signal output to the judge module.

3. power circuit as claimed in claim 2, it is characterised in that the rectification module includes silicon bridge circuit.

4. power circuit as claimed in claim 2, it is characterised in that the detection circuit includes filtration module, the filtering Module connects the rectification module and the judge module, the interference letter that the filtration module is used to filter in the direct current signal Number.

5. power circuit as claimed in claim 4, it is characterised in that the filtration module includes filter capacitor.

6. power circuit as claimed in claim 2, it is characterised in that the judge module includes that comparator and first judges single Unit, the comparator connects the rectification module, and the detection circuit includes that reference voltage provides module, and the reference voltage is carried It is used to provide reference voltage for module, the comparator is used to comparing the voltage of the direct current signal and the reference voltage and defeated Go out comparison signal, first judging unit is used to judge that the external power source is high voltage power supply or low according to the comparison signal Voltage source.

7. power circuit as claimed in claim 2, it is characterised in that the judge module includes parallel voltage-stablizer and second Judging unit, the parallel voltage-stablizer connects the rectification module, and second judging unit is used in the direct current signal Voltage higher than the parallel voltage-stablizer conducting voltage when judge that the external power source be high voltage power supply, it is described second judgement Unit is used to judge the external power source when the voltage of the direct current signal is less than the conducting voltage of the parallel voltage-stablizer It is low-tension supply.

8. power circuit as claimed in claim 2, it is characterised in that the detection circuit includes being connected with the judge module Control module, the control module be used for the external power source be high voltage power supply or low-tension supply when cause to isolate with described The electrical equipment of the secondary end connection of transformer is operated in different voltage status.

9. power circuit as claimed in claim 2, it is characterised in that the judge module includes that partial pressure unit and the 3rd judges Unit, the 3rd judging unit includes analog to digital conversion circuit, and the partial pressure unit connects analog-digital conversion circuit as described, described point Pressure unit is used to adjust the input voltage of analog-digital conversion circuit as described, and analog-digital conversion circuit as described is used for the rectification module is defeated The direct current signal for going out is converted to voltage value, and the 3rd judging unit is used to judge described outer according to the voltage value Portion's power supply is high voltage power supply or low-tension supply.

10. a kind of audio frequency apparatus, it is characterised in that including the power circuit as described in claim 1-9 any one.