Anti-surge circuit, power supply of power amplifier equipment and power amplifier equipment

Abstract

The utility model provides an anti-surge circuit, a power supply of power amplifier equipment and the power amplifier equipment, and relates to the technical field of circuit protection. A control end of a switching circuit in the anti-surge circuit is connected with a power supply circuit so as to control on-off of the power supply circuit; the detection end of the zero-cross detection circuit is connected with the input end of the power supply circuit and the control end of the switching circuit, and the zero-cross detection circuit is used for sending a control signal to the switching circuit to control the switching circuit to work when an electric signal in the power supply circuit crosses a zero point. According to the embodiment of the invention, when the electric signal in the power supply circuit crosses the zero point, the power supply circuit is switched on by using the zero-cross detection circuit, so that the surge current generated by the power supply circuit is eliminated, the impact influence of the surge current is avoided, the service life is long, the reliability is high, and the interference of the equipment on accessory equipment in the startup and shutdown process is reduced at the same time.

Description

Technical Field

[0001] The present application relates to the technical field of circuit protection, and in particular to a surge protection circuit, a power supply for a power amplifier device, and a power amplifier device. Background Art

[0002] With the increasing development of electrical equipment, the power requirements for electrical equipment are also increasing. At present, most of the protection circuits for large current surges in the power ports of electrical equipment use thermistors. However, thermistors cannot effectively eliminate surge current impacts, and after repeated switching on and off, thermistors will reduce their resistance due to repeated heating, thereby reducing their surge protection capabilities. Utility Model Content

[0003] The embodiments of the present application provide a surge protection circuit, a power supply for a power amplifier device, and a power amplifier device, which can solve the problem that the existing surge protection circuit cannot effectively eliminate the surge current impact and the surge protection capability will decrease during use. To achieve this purpose, the embodiments of the present application provide the following solutions.

[0004] According to one aspect of an embodiment of the present application, there is provided a surge protection circuit, comprising: a zero-crossing detection circuit, a switch circuit, wherein a control end of the switch circuit is connected to a power supply circuit to control the on and off of the power supply circuit;

[0005] The detection end of the zero-crossing detection circuit is connected to the input end of the power supply circuit and the control end of the switch circuit. The zero-crossing detection circuit is used to send a control signal to the switch circuit to control the operation of the switch circuit when the electrical signal in the power supply circuit passes through a zero point.

[0006] In a possible implementation, the zero-crossing detection circuit includes a detection module, the detection module is connected to the first input terminal of the power supply circuit, and the control signal output terminal of the detection module is connected to the signal receiving terminal of the switch circuit.

[0007] In one possible implementation, the zero-crossing detection circuit also includes a voltage divider circuit including a first resistor and a second resistor, wherein the first end of the first resistor is connected to the first input end of the power supply circuit, the second end of the first resistor is connected to the first end of the second resistor and the detection module, and the second end of the second resistor is grounded.

[0008] In a possible implementation, the surge protection circuit also includes an AC-DC conversion circuit, the two input ends of the AC-DC conversion circuit are correspondingly connected to the first input end and the second input end of the power supply circuit, and the output end of the AC-DC conversion circuit is connected to the voltage input end of the detection module.

[0009] In a possible implementation, the surge protection circuit further includes a power switch, a first end of the power switch is connected to an input end of the AC / DC conversion circuit, and a second end of the power switch is connected to a voltage input end of the detection module.

[0010] In a possible implementation, the switching circuit includes a first transistor, a first diode and a relay, the base of the first transistor is connected to the output end of the zero-crossing detection circuit, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the anode of the first diode and the first end of the relay, the cathode of the first diode is connected to the second end of the relay and the power supply corresponding to the relay, and the control switch of the relay is connected to the power supply circuit.

[0011] Based on the same inventive concept, a power supply for a power amplifier device is also proposed, comprising a power supply circuit, a rectifier circuit and the surge protection circuit as described above, wherein the power supply circuit is connected to the surge protection circuit, and the output end of the power supply circuit is connected to the input end of the rectifier circuit;

[0012] The output end of the rectifier circuit is connected to the electrical components inside the power amplifier device.

[0013] In one possible implementation, the rectifier circuit includes a rectifier bridge and a first capacitor, the AC input end of the rectifier bridge is connected to the output end of the power supply circuit, the first end of the first capacitor is connected to the first DC output end of the rectifier bridge, and the second end of the first capacitor is connected to the second DC output end of the rectifier bridge.

[0014] In a possible implementation, the power supply circuit further includes an overcurrent protection circuit, an input end of the overcurrent protection circuit is connected to an input end of the power supply circuit, and a detection end of the zero-crossing detection circuit is connected to the input end of the overcurrent protection circuit.

[0015] Based on the same inventive concept, a power amplifier device is also proposed, wherein the power amplifier device includes the power supply of the power amplifier device as described above.

[0016] The beneficial effects of the technical solution provided by the embodiment of the present application are:

[0017] The surge protection circuit provided by the present application is provided with a zero-crossing detection circuit and a switch circuit. The control end of the switch circuit is connected to the power supply circuit to control the on and off of the power supply circuit; the detection end of the zero-crossing detection circuit is connected to the input end of the power supply circuit and the control end of the switch circuit. The zero-crossing detection circuit is used to send a control signal to the switch circuit to control the operation of the switch circuit when the electrical signal in the power supply circuit passes through the zero point. In the embodiment of the present application, when the electrical signal in the power supply circuit passes through the zero point, the zero-crossing detection circuit is used to connect the power supply circuit, thereby eliminating the surge current generated by the power supply circuit, and will not be affected by the surge current impact, has a long life, high reliability, and at the same time reduces the interference of the device in which it is located to the accessory device during the switching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in describing the embodiments of the present application.

[0019] Figure 1 A structural diagram of a surge protection circuit provided in an embodiment of the present application;

[0020] Figure 2 A circuit diagram of a surge protection circuit provided in an embodiment of the present application;

[0021] Figure 3 A structural diagram of an embodiment of a power supply for a power amplifier device provided in this application;

[0022] Figure 4 A connection diagram of an embodiment of a power supply for a power amplifier device provided in the present application;

[0023] Figure 5 This is a structural diagram of an embodiment of a power amplifier device provided in an embodiment of the present application.

[0024] Explanation of reference numerals: F1, fuse; R1, first resistor; R2, second resistor; JK1, control switch; SW, power switch; Q1, first transistor; D1, first diode; D2, relay; BD1, rectifier bridge; C1, first capacitor. DETAILED DESCRIPTION

[0025] The embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the implementation methods described below in conjunction with the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application and do not constitute a limitation on the technical solutions of the embodiments of the present application.

[0026] It will be understood by those skilled in the art that, unless specifically stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the terms "including" and "comprising" used in the embodiments of the present application refer to that the corresponding features can be implemented as the presented features, information, data, steps, operations, elements and / or components, but do not exclude the implementation of other features, information, data, steps, operations, elements, components and / or combinations thereof supported by the present technical field. It should be understood that when we say that an element is "connected" or "coupled" to another element, the one element may be directly connected or coupled to the other element, or it may refer to that the one element and the other element establish a connection relationship through an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein indicates at least one of the items defined by the term, for example, "A and / or B" indicates that it is implemented as "A", or is implemented as "A", or is implemented as "A and B".

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] The following describes several exemplary embodiments to illustrate the technical solutions of the embodiments of the utility model and the technical effects produced by the technical solutions of the utility model. It should be noted that the following embodiments can refer to, draw on or combine with each other, and the same terms, similar features and similar implementation steps in different embodiments will not be described repeatedly.

[0029] The surge protection circuit, power supply for power amplifier equipment and power amplifier equipment provided in the present application are intended to solve at least one technical problem existing in the prior art.

[0030] In the embodiment of the present application, a surge protection circuit is provided, such as Figure 1 , Figure 2 As shown, the surge protection circuit includes: a zero-crossing detection circuit and a switch circuit. The control end of the switch circuit is connected to the power supply circuit to control the on and off of the power supply circuit. The detection end of the zero-crossing detection circuit is connected to the input end of the power supply circuit and the control end of the switch circuit. The zero-crossing detection circuit is used to send a control signal to the switch circuit to control the operation of the switch JK1 circuit when the electrical signal in the power supply circuit passes through the zero point. After receiving the control signal, the switch circuit controls the power supply circuit to be turned on, so that the electrical signal received by the power supply object connected to the power supply circuit is a signal that changes gradually from the zero point, rather than a suddenly changing electrical signal corresponding to the surge current, thereby eliminating the surge current.

[0031] Optionally, the power supply circuit transmits alternating current, the zero-crossing detection circuit obtains the electrical signal waveform of the alternating current, detects the electrical signal according to the waveform, and sends a control signal to the switch circuit when the electrical signal crosses the zero point. The switch circuit controls the power supply circuit to conduct according to the control signal, thereby supplying power to the device connected to the power supply circuit.

[0032] Optionally, the zero-crossing detection circuit includes a detection module, the detection module is connected to the first input end of the power supply circuit, and a control signal output end of the detection module is connected to the signal receiving end of the switch circuit.

[0033] Optionally, the electrical signal may be a current signal or a voltage signal, and the detection module sends a control signal when the electrical signal passes through a zero point.

[0034] In one embodiment, the detection module may be a single chip microcomputer or other chips with a zero-crossing detection function.

[0035] Optionally, in order to supply power to the detection module, the zero-crossing detection circuit has an AC-DC conversion circuit, two input ends of the AC-DC conversion circuit are correspondingly connected to the first input end and the second input end of the power supply circuit, and the output end of the AC-DC conversion circuit is connected to the voltage input end of the detection module. Direct current is input to the detection module through the AC-DC conversion circuit.

[0036] In one embodiment, the power supply circuit is connected to the mains, and the AC-DC conversion circuit converts the mains into 12V DC. After the power supply circuit is powered on, the AC-DC conversion circuit converts the mains connected to the power supply circuit into DC, and the detection module of the zero-crossing detection circuit receives the DC and starts working.

[0037] Optionally, the zero-crossing detection circuit further includes a voltage divider circuit provided with a first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is connected to the first input end of the power supply circuit, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the detection module, and the second end of the second resistor R2 is grounded. The detection module performs zero-crossing detection according to the voltage of the second resistor R2 or the current flowing through the second resistor R2.

[0038] Optionally, the surge protection circuit further includes a power switch SW, wherein a first end of the power switch SW is connected to an input end of the AC / DC conversion circuit, and a second end of the power switch SW is connected to a voltage input end of the detection module. The surge protection circuit is turned on or off by using the power switch SW. When the power switch SW is closed, the AC / DC conversion circuit supplies power to the detection module.

[0039] Optionally, the switching circuit includes a first transistor Q1, a first diode D1 and a relay D2, the base of the first transistor Q1 is connected to the output end of the zero-crossing detection circuit, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the anode of the first diode D1 and the first end of the relay D2, the cathode of the first diode D1 is connected to the second end of the relay D2 and the power supply corresponding to the relay D2, and the control switch JK1 of the relay D2 is connected to the power supply circuit.

[0040] Optionally, the control switch JK1 is a bidirectional switch, and when the relay D2 is energized, the control switch JK1 controls the power supply circuit to be turned on.

[0041] In one embodiment, the output end of the AC-DC conversion circuit may be connected to the second end of the relay D2, and the AC-DC conversion circuit may be used to supply power to the detection module and the relay D2 respectively.

[0042] Combine the following Figure 2 The surge protection circuit of the present application is described.

[0043] In one embodiment, the power supply circuit is connected to the mains, the AC / DC conversion circuit converts the mains into 12V DC, the relay D2 is energized, the power switch SW is closed, the detection module is powered on, and the mains is divided by the first resistor R1 and the second resistor R2 to provide a detection signal to the detection module. The detection module detects the zero-crossing voltage of the mains. At the zero-crossing point of the mains, the detection module outputs a high level to drive the first transistor Q1, the first transistor Q1 is turned on, the relay D2 is pulled low, the control switch JK1 is closed, and the power supply circuit is connected to the mains, thereby eliminating the surge current impact.

[0044] The surge protection circuit of the present application is provided with a zero-crossing detection circuit and a switch circuit. The control end of the switch circuit is connected to the power supply circuit to control the on and off of the power supply circuit; the detection end of the zero-crossing detection circuit is connected to the input end of the power supply circuit and the control end of the switch circuit. The zero-crossing detection circuit is used to send a control signal to the switch circuit to control the operation of the switch JK1 circuit when the electrical signal in the power supply circuit passes through the zero point. In the embodiment of the present application, when the electrical signal in the power supply circuit passes through the zero point, the zero-crossing detection circuit is used to connect the power supply circuit, thereby eliminating the surge current generated by the power supply circuit, and will not be affected by the surge current impact, has a long service life, high reliability, and at the same time reduces the interference of the device in which it is located to the accessory device during the switching process.

[0045] Based on the same inventive concept, the present application also provides a power supply for a power amplifier device, such as Figure 2-4 As shown, the power supply includes a power supply circuit, a rectifier circuit and an anti-surge circuit. The power supply circuit is connected to the anti-surge circuit, and the output end of the power supply circuit is connected to the input end of the rectifier circuit; the output end of the rectifier circuit is connected to the electrical components inside the power amplifier device.

[0046] Optionally, the zero-crossing detection circuit includes a detection module, the detection module is connected to the first input end of the power supply circuit, and a control signal output end of the detection module is connected to a signal receiving end of the switch circuit.

[0047] Optionally, the zero-crossing detection circuit also includes a voltage divider circuit including a first resistor R1 and a second resistor R2, wherein the first end of the first resistor R1 is connected to the first input end of the power supply circuit, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the detection module, and the second end of the second resistor R2 is grounded.

[0048] Optionally, the surge protection circuit also includes an AC / DC conversion circuit, two input terminals of the AC / DC conversion circuit are correspondingly connected to the first input terminal and the second input terminal of the power supply circuit, and the output terminal of the AC / DC conversion circuit is connected to the voltage input terminal of the detection module.

[0049] Optionally, the surge protection circuit further includes a power switch SW, a first end of the power switch SW is connected to the input end of the AC / DC conversion circuit, and a second end of the power switch SW is connected to the voltage input end of the detection module.

[0050] Optionally, the switching circuit includes a first transistor Q1, a first diode D1 and a relay D2, the base of the first transistor Q1 is connected to the output end of the zero-crossing detection circuit, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the anode of the first diode D1 and the first end of the relay D2, the cathode of the first diode D1 is connected to the second end of the relay D2 and the power supply corresponding to the relay D2, and the control switch JK1 of the relay D2 is connected to the power supply circuit.

[0051] Optionally, the rectifier circuit includes a rectifier bridge BD1 and a first capacitor C1, the AC input end of the rectifier bridge BD1 is connected to the output end of the power supply circuit, the first end of the first capacitor C1 is connected to the first DC output end of the rectifier bridge BD1, and the second end of the first capacitor C1 is connected to the second DC output end of the rectifier bridge BD1.

[0052] Optionally, the power supply circuit further includes an overcurrent protection circuit, an input end of the overcurrent protection circuit is connected to an input end of the power supply circuit, and a detection end of the zero-crossing detection circuit is connected to the input end of the overcurrent protection circuit.

[0053] In one embodiment, the overcurrent protection circuit includes a fuse F1, which is arranged on the live wire of the power supply circuit. The current connected to the power supply circuit passes through the fuse F1 and is then transmitted to the surge protection circuit.

[0054] Optionally, the power supply also includes a power amplifier main power supply, the input end of which is connected to the output end of the rectifier circuit. The power amplifier main power supply is used to adjust the voltage and current output by the rectifier circuit to a voltage and current that matches the power amplifier device. The power amplifier main power supply may include a boost circuit or a buck circuit.

[0055] Based on the same inventive concept, the present application also proposes a power amplifier device, such as Figure 5 As shown, the power amplifier device includes the power supply of the power amplifier device as described in the above embodiment.

[0056] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that shown or described in the drawings.

[0057] It should be understood that, although each operation step is indicated by arrows in the flowchart of the embodiment of the present application, the implementation order of these steps is not limited to the order indicated by the arrows. Unless clearly stated herein, in some implementation scenarios of the embodiment of the present application, the implementation steps in each flowchart can be performed in other orders according to demand. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on actual implementation scenarios. Some or all of these sub-steps or stages may be executed at the same time, and each sub-step or stage in these sub-steps or stages may also be executed at different times respectively. In different scenarios of execution time, the execution order of these sub-steps or stages may be flexibly configured according to demand, and the embodiment of the present application does not limit this.

[0058] The above is only an optional implementation method for some implementation scenarios of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the technical concept of the solution of the present application, other similar implementation methods based on the technical ideas of the present application are also within the protection scope of the embodiments of the present application.

Claims

1. A surge protection circuit, characterized in that: include: A zero-crossing detection circuit and a switch circuit, wherein a control end of the switch circuit is connected to a power supply circuit to control the on-off of the power supply circuit; The detection end of the zero-crossing detection circuit is connected to the input end of the power supply circuit and the control end of the switch circuit. The zero-crossing detection circuit is used to send a control signal to the switch circuit to control the operation of the switch circuit when the electrical signal in the power supply circuit passes through a zero point.

2. The surge protection circuit according to claim 1, characterized in that: include: The zero-crossing detection circuit comprises a detection module, the detection module is connected to the first input end of the power supply circuit, and the control signal output end of the detection module is connected to the signal receiving end of the switch circuit.

3. The surge protection circuit according to claim 2, characterized in that: The zero-crossing detection circuit also includes a voltage divider circuit including a first resistor and a second resistor, wherein the first end of the first resistor is connected to the first input end of the power supply circuit, the second end of the first resistor is connected to the first end of the second resistor and the detection module, and the second end of the second resistor is grounded.

4. The surge protection circuit according to claim 2, characterized in that: The surge protection circuit also includes an AC-DC conversion circuit, two input ends of the AC-DC conversion circuit are correspondingly connected to the first input end and the second input end of the power supply circuit, and the output end of the AC-DC conversion circuit is connected to the voltage input end of the detection module.

5. The surge protection circuit according to claim 4, characterized in that: The surge protection circuit further includes a power switch, a first end of the power switch is connected to the input end of the AC / DC conversion circuit, and a second end of the power switch is connected to the voltage input end of the detection module.

6. The surge protection circuit according to claim 1, characterized in that: The switching circuit includes a first transistor, a first diode and a relay, the base of the first transistor is connected to the output end of the zero-crossing detection circuit, the emitter of the first transistor is grounded, the collector of the first transistor is connected to the anode of the first diode and the first end of the relay, the cathode of the first diode is connected to the second end of the relay and the power supply corresponding to the relay, and the control switch of the relay is connected to the power supply circuit.

7. A power supply for a power amplifier device, characterized in that: It comprises a power supply circuit, a rectifier circuit and the surge protection circuit according to any one of claims 1 to 6, wherein the power supply circuit is connected to the surge protection circuit, and the output end of the power supply circuit is connected to the input end of the rectifier circuit; The output end of the rectifier circuit is connected to the electrical components inside the power amplifier device.

8. The power supply for the power amplifier device according to claim 7, characterized in that: The rectifier circuit includes a rectifier bridge and a first capacitor, the AC input end of the rectifier bridge is connected to the output end of the power supply circuit, the first end of the first capacitor is connected to the first DC output end of the rectifier bridge, and the second end of the first capacitor is connected to the second DC output end of the rectifier bridge.

9. The power supply for the power amplifier device according to claim 7, characterized in that: The power supply circuit also includes an overcurrent protection circuit, an input end of the overcurrent protection circuit is connected to an input end of the power supply circuit, and a detection end of the zero-crossing detection circuit is connected to the input end of the overcurrent protection circuit.

10. A power amplifier device, characterized in that: The power amplifier device comprises a power supply of the power amplifier device as described in any one of claims 7 to 9.

Images