Power amplifier circuit and electric appliance

Abstract

The embodiment of the utility model provides a power amplifier circuit and an electric appliance. The power amplifier circuit comprises a transformer, a resonance circuit, a relay group, an electric signal feedback circuit and a main control circuit, a primary winding of the transformer is connected with a power supply, the resonance circuit is connected with a secondary winding of the transformer, the relay group comprises a first relay and a second relay which are connected in series, the relay group and the electric signal feedback circuit are connected with the resonance circuit, and the main control circuit generates an alarm signal according to an electric signal value acquired by the electric signal feedback circuit; when the test power is amplified through the power amplifier circuit, the second relay is cut off, the first relay completes connection and disconnection actions, and at the moment, whether a circuit system of an electric appliance works normally or not can be judged through an electric signal value acquired by the electric signal feedback circuit, so that the safety risk is reduced, and the requirement of functional safety is met.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of circuit control, and in particular to a power amplifier circuit and an electrical appliance. Background Art

[0002] At present, some electrical equipment, especially medical electrical equipment, usually uses a power amplifier circuit with only one set of output relays. When the electrical equipment performs self-test, an output power will be generated. At this time, it is impossible to determine whether the electrical equipment is connected to the human body, which poses a certain safety risk. Utility Model Content

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The purpose of this application is to solve one of the technical problems existing in the related art to at least a certain extent. The embodiments of this application provide a power amplifier circuit and an electrical appliance to reduce safety risks and meet functional safety requirements.

[0005] An embodiment of the first aspect of the present application, a power amplifier circuit, includes:

[0006] A transformer, wherein the primary winding of the transformer is connected to a power source;

[0007] A resonant circuit connected to the secondary winding of the transformer;

[0008] A relay group, the relay group comprising a first relay connected to the functional circuit and a second relay connected to the output circuit, the first relay and the second relay are connected in series, and the relay group is connected to the resonant circuit;

[0009] an electrical signal feedback circuit, the electrical signal feedback circuit being connected to the resonant circuit;

[0010] A main control circuit is used to generate an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit.

[0011] According to certain embodiments of the first aspect of the present application, the resonant circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor; the first switch, the second switch, the third switch, the fourth switch and the fifth switch, one end of the first capacitor is connected to the first switch, one end of the first inductor is connected to the second switch and the third switch, one end of the second inductor is connected to the fourth switch, the other end of the second inductor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of the first capacitor, and both ends of the third capacitor are respectively connected to both ends of the fifth switch.

[0012] According to some embodiments of the first aspect of the present application, the resonant circuit is connected to a unipolar output terminal.

[0013] According to some embodiments of the first aspect of the present application, the resonant circuit is connected to a bipolar output terminal.

[0014] According to certain embodiments of the first aspect of the present application, the electrical signal feedback circuit includes a current feedback circuit.

[0015] According to certain embodiments of the first aspect of the present application, the electrical signal feedback circuit includes a voltage feedback circuit.

[0016] According to certain embodiments of the first aspect of the present application, a filtering circuit is connected between the primary winding of the transformer and the power supply, and the filtering circuit includes a third inductor, a fourth capacitor and a fifth capacitor, one end of the third inductor is connected to the power supply, the other end of the third inductor is connected to one end of the fourth capacitor and one end of the fifth capacitor, and the other end of the fourth capacitor and the other end of the fifth capacitor are grounded.

[0017] According to certain embodiments of the first aspect of the present application, the power supply is a variable voltage power supply.

[0018] An embodiment of the second aspect of the present application is an electrical appliance, comprising the power amplifier circuit as described above.

[0019] The above scheme has at least the following beneficial effects: the power amplifier circuit is applied to electrical appliances, and when the electrical appliance performs a power-on self-test, a test power is output. When the test power is amplified by the power amplifier circuit, the second relay is cut off, and the first relay completes the connection and disconnection action. At this time, the electrical signal value collected by the electrical signal feedback circuit can be used to judge whether the circuit system of the electrical appliance is working normally. The first relay and the second relay are sampling safety relays. When electric shock adhesion and other situations occur, the electrical signal value collected by the electrical signal feedback circuit will be abnormal. The main control circuit generates an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit, thereby reducing safety risks and meeting functional safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0021] Figure 1 It is a schematic diagram of the structure of the power amplifier circuit;

[0022] Figure 2 It is the circuit diagram of the power supply, transformer, power MOS tube and current feedback circuit;

[0023] Figure 3 It is a circuit diagram of a voltage feedback circuit, a unipolar output terminal and a bipolar output terminal;

[0024] Figure 4 is the circuit diagram of the first relay;

[0025] Figure 5 This is the circuit diagram of the second relay. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that, although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first", "second", etc. in the specification, claims or the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0028] The power amplifier circuits used in current electrical equipment usually have only one set of output relays. When the electrical equipment performs self-test, an output power is generated. At this time, it is impossible to determine whether the electrical equipment is connected to the human body, which poses a certain safety risk.

[0029] In order to solve the above problems, an embodiment of the present application provides a power amplifier circuit.

[0030] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0031] Reference Figures 1 to 5 The power amplifier circuit includes: a transformer 300, a resonant circuit 500, a relay group, an electrical signal feedback circuit 600 and a main control circuit 800.

[0032] Among them, the primary winding of the transformer 300 is connected to the power supply 100; the resonant circuit 500 is connected to the secondary winding of the transformer 300; the relay group includes a first relay 400 connected to the functional circuit and a second relay 700 connected to the output circuit, the first relay 400 and the second relay 700 are connected in series, and the relay group is connected to the resonant circuit 500; the electrical signal feedback circuit 600 is connected to the resonant circuit 500; the main control circuit 800 is used to generate an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit 600.

[0033] In this embodiment, the power amplifier circuit is applied to an electrical appliance. When the electrical appliance performs a power-on self-test, a test power is output. When the test power is amplified by the power amplifier circuit, the second relay 700 is cut off, and the first relay 400 completes the on and off action. At this time, the electrical signal value collected by the electrical signal feedback circuit 600 can be used to determine whether the circuit system of the electrical appliance is working normally. The first relay 400 and the second relay 700 are sampling safety relays. When electric shock adhesion and other situations occur, the electrical signal value collected by the electrical signal feedback circuit 600 will be abnormal. The main control circuit 800 generates an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit 600, thereby reducing safety risks and meeting functional safety requirements.

[0034] The power supply 100 is a variable voltage power supply 100 .

[0035] Reference Figure 2 A filter circuit is connected between the primary winding of the transformer 300 and the power supply 100, and the filter circuit includes a third inductor, a fourth capacitor and a fifth capacitor. One end of the third inductor is connected to the power supply 100, the other end of the third inductor is connected to one end of the fourth capacitor and one end of the fifth capacitor, and the other end of the fourth capacitor and the other end of the fifth capacitor are grounded.

[0036] A power MOS tube 200 is connected between the primary winding of the transformer 300 and the power source 100 .

[0037] The resonant circuit 500 includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor; the first switch, the second switch, the third switch, the fourth switch and the fifth switch, one end of the first capacitor is connected to the first switch, one end of the first inductor is connected to the second switch and the third switch, one end of the second inductor is connected to the fourth switch, the other end of the second inductor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of the first capacitor, and both ends of the third capacitor are respectively connected to both ends of the fifth switch.

[0038] The electrical signal feedback circuit 600 includes a current feedback circuit 610 and a voltage feedback circuit 620. The current signal output by the resonance circuit 500 is fed back through the current feedback circuit 610, and the voltage signal output by the resonance circuit 500 is fed back through the voltage feedback circuit 620.

[0039] The resonant circuit 500 is connected to a unipolar output terminal 910 and a bipolar output terminal 920. The unipolar output terminal 910 includes one power output pole, and the bipolar output terminal 920 includes two power output poles.

[0040] The first relays 400 have five pieces, and the second relays 700 have four pieces.

[0041] The first relay 400 and the second relay 700 have the same structure. Taking the first relay 400 as an example, the specific structure of the first relay 400 is as follows: a resistor R31, a capacitor C48, a light-emitting diode LED1, a diode D16, and a relay body; two ends of the relay body are respectively connected to two ends of the diode D16, two ends of the relay body are respectively connected to two ends of the capacitor C48, one end of the relay body is connected to the cathode of the light-emitting diode LED1, the other end of the relay body is connected to one end of the resistor R31, and the other end of the resistor R31 is connected to the anode of the light-emitting diode LED1.

[0042] An embodiment of the present application provides an electrical appliance, which includes a power amplifier circuit.

[0043] The power amplifier circuit includes: a transformer 300, a resonant circuit 500, a relay group, an electric signal feedback circuit 600 and a main control circuit 800. The primary winding of the transformer 300 is connected to the power supply 100; the resonant circuit 500 is connected to the secondary winding of the transformer 300; the relay group includes a first relay 400 connected to the functional circuit and a second relay 700 connected to the output circuit, the first relay 400 and the second relay 700 are connected in series, and the relay group is connected to the resonant circuit 500; the electric signal feedback circuit 600 is connected to the resonant circuit 500; the main control circuit 800 is used to generate an alarm signal according to the electric signal value collected by the electric signal feedback circuit 600.

[0044] In this embodiment, the power amplifier circuit is applied to an electrical appliance. When the electrical appliance performs a power-on self-test, a test power is output. When the test power is amplified by the power amplifier circuit, the second relay 700 is cut off, and the first relay 400 completes the on and off action. At this time, the electrical signal value collected by the electrical signal feedback circuit 600 can be used to determine whether the circuit system of the electrical appliance is working normally. The first relay 400 and the second relay 700 are sampling safety relays. When electric shock adhesion and other situations occur, the electrical signal value collected by the electrical signal feedback circuit 600 will be abnormal. The main control circuit 800 generates an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit 600, thereby reducing safety risks and meeting functional safety requirements.

[0045] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Technical personnel familiar with the field can make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A power amplifier circuit, characterized in that: include: A transformer, wherein the primary winding of the transformer is connected to a power source; A resonant circuit connected to the secondary winding of the transformer; A relay group, the relay group comprising a first relay connected to the functional circuit and a second relay connected to the output circuit, the first relay and the second relay are connected in series, and the relay group is connected to the resonant circuit; an electrical signal feedback circuit, the electrical signal feedback circuit being connected to the resonant circuit; A main control circuit is used to generate an alarm signal according to the electrical signal value collected by the electrical signal feedback circuit.

2. A power amplifier circuit according to claim 1, characterized in that: The resonant circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor; the first switch, the second switch, the third switch, the fourth switch and the fifth switch, one end of the first capacitor is connected to the first switch, one end of the first inductor is connected to the second switch and the third switch, one end of the second inductor is connected to the fourth switch, the other end of the second inductor is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of the first capacitor, and both ends of the third capacitor are respectively connected to both ends of the fifth switch.

3. A power amplifier circuit according to claim 1, characterized in that: The resonant circuit is connected to a unipolar output terminal.

4. A power amplifier circuit according to claim 1, characterized in that: The resonant circuit is connected to a bipolar output terminal.

5. A power amplifier circuit according to claim 1, characterized in that: The electrical signal feedback circuit includes a current feedback circuit.

6. A power amplifier circuit according to claim 1, characterized in that: The electrical signal feedback circuit includes a voltage feedback circuit.

7. A power amplifier circuit according to claim 1, characterized in that: A filter circuit is connected between the primary winding of the transformer and the power supply, and the filter circuit includes a third inductor, a fourth capacitor and a fifth capacitor. One end of the third inductor is connected to the power supply, the other end of the third inductor is connected to one end of the fourth capacitor and one end of the fifth capacitor, and the other end of the fourth capacitor and the other end of the fifth capacitor are grounded.

8. The power amplifier circuit according to claim 1, characterized in that: The power supply is a variable voltage power supply.

9. An electrical appliance, characterized in that: The electrical appliance comprises the power amplifier circuit as claimed in any one of claims 1 to 8.

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