Human body detection circuit and radio frequency output device

Abstract

The utility model provides a human body detection circuit and a radio frequency output device. The human body detection circuit comprises a conductive assembly, a filter circuit, a detection circuit and a control circuit. The conductive assembly is used for making contact with the human skin. The detection circuit is electrically connected with the filter circuit, and the detection circuit is used for outputting a detection signal detected when the conductive component is in contact with the human skin to the filter circuit. And the filter circuit is used for filtering the detection signal and outputting the filtered detection signal. The control circuit is electrically connected with the filter circuit; and the control circuit is used for outputting a driving signal according to the filtered detection signal. Contact between the human body and the conductive assembly is detected through the detection circuit, the radio frequency signal is controlled to be output to the human body through the control circuit after the human body is in contact with the conductive assembly, power output before a current signal acts on the human body can be avoided, and then power consumption is reduced.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a human body detection circuit and a radio frequency output device. Background Art

[0002] When beauty devices such as beauty instruments or hair removal instruments are working, they emit light waves of a specific wavelength or current of a specific frequency to act on the human epidermis. However, the light waves or current will only take effect when they come into contact with human skin. Before that, the output light waves or current will not act on the human body, but will increase power consumption. Utility Model Content

[0003] In order to solve the problems in the prior art, the present application provides a human body detection circuit and a radio frequency output device.

[0004] The present application provides a human body detection circuit, the human body detection circuit comprising:

[0005] Conductive components, used for contacting with human skin;

[0006] Filter circuit;

[0007] A detection circuit, electrically connected to the filter circuit, the detection circuit being used to output a detection signal detected when the conductive component is in contact with human skin to the filter circuit;

[0008] The filtering circuit is used to filter the detection signal and output the filtered detection signal;

[0009] A control circuit is electrically connected to the filter circuit; the control circuit is used to output a drive signal according to the filtered detection signal.

[0010] In one embodiment, the detection circuit includes a first resistor; the first end of the conductive component is used to access the power supply voltage, and the second end of the conductive component is electrically connected to the first end of the first resistor;

[0011] The first end of the first resistor is electrically connected to the filter circuit, and the second end of the first resistor is grounded; the first end of the first resistor is used to output a voltage signal when the human body is connected;

[0012] The filter circuit is used to filter the voltage signal; the control circuit is used to output the drive signal according to the filtered voltage signal.

[0013] In one embodiment, the filtering circuit includes a second resistor and a first capacitor;

[0014] The first end of the second resistor is electrically connected to the first end of the first resistor, and the second end of the second resistor is electrically connected to the control circuit; the first end of the first capacitor is electrically connected to the second end of the second resistor, and the second end of the first capacitor is grounded.

[0015] In one embodiment, the human body detection circuit further includes an amplification circuit;

[0016] The input end of the amplifier circuit is electrically connected to the filter circuit, and the output end of the amplifier circuit is electrically connected to the control circuit; the amplifier circuit is used to amplify and output the filtered detection signal.

[0017] In one embodiment, the human body detection circuit is applied to a radio frequency output device, and the radio frequency output device further includes a driving circuit; the detection circuit includes a third resistor;

[0018] The first end and the second end of the third resistor are both used to access the power supply voltage, and the second end of the third resistor is also electrically connected to the control circuit;

[0019] The driving circuit is electrically connected to the conductive component; the driving circuit is used to form a loop with the detection circuit and the human skin when the conductive component is in contact with the human skin.

[0020] In one embodiment, the driving circuit includes a first switch component, a second switch component, a third switch component and a fourth switch component;

[0021] The first end of the first switch component, the first end of the second switch component, the first end of the third switch component and the first end of the fourth switch component are all electrically connected to the control circuit;

[0022] The second end of the first switch component is electrically connected to the second end of the third resistor, the second end of the first switch component is electrically connected to the second end of the second switch component, and the third end of the second switch component is grounded; the third end of the first switch component is also electrically connected to the first end of the conductive component;

[0023] The second end of the third switch component is electrically connected to the second end of the third resistor, the second end of the third switch component is electrically connected to the second end of the fourth switch component, and the third end of the fourth switch component is grounded; the third end of the third switch component is also electrically connected to the second end of the conductive component;

[0024] The control circuit is used to control the first switch component and the fourth switch component to be turned on, and the third switch component and the second switch component to be turned off; or to control the first switch component and the fourth switch component to be turned off, and the third switch component and the second switch component to be turned on.

[0025] In one embodiment, it further includes a voltage divider circuit;

[0026] The input end of the voltage divider circuit is electrically connected to the second end of the third resistor, and the output end of the voltage divider circuit is electrically connected to the control circuit. The voltage divider circuit is used to divide the voltage of the second end of the third resistor to obtain a voltage divider signal and output it to the control circuit. The control circuit is used to output the drive signal according to the voltage divider signal output by the voltage divider circuit.

[0027] In one embodiment, it further includes a current detection circuit;

[0028] The detection end of the current detection circuit is electrically connected to the third resistor, and the output end of the current detection circuit is electrically connected to the control circuit; the current detection circuit is used to detect the current output by the third resistor, and convert the detected current into a voltage signal and output it to the control circuit;

[0029] The control circuit is used for outputting the driving signal according to the voltage signal output by the current detection circuit.

[0030] In one embodiment, the human body detection circuit further includes a fourth resistor;

[0031] A first end of the fourth resistor is electrically connected to both the third end of the second switch component and the third end of the fourth switch component, and a second end of the fourth resistor is grounded.

[0032] The present application also proposes a radio frequency output device, comprising a driving circuit and the above-mentioned human body detection circuit, wherein the driving signal output by the human body detection circuit is used to drive the driving circuit to output a radio frequency signal to the conductive component.

[0033] The present application detects the contact between the human body and the conductive component through the detection circuit, and controls the current signal to be output to the human body after the human body and the conductive component are in contact through the control circuit. In this way, power output before the current signal acts on the human body can be avoided, thereby reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the module structure of an embodiment of a human body detection circuit of the present application.

[0035] Figure 2 FIG. 4 is a circuit structure diagram of another embodiment of the human body detection circuit of the present application.

[0036] Figure 3 This is a circuit structure diagram of another embodiment of the human body detection circuit of the present application.

[0037] Figure 4This is a circuit structure diagram of another embodiment of the human body detection circuit of the present application.

[0038] Main component symbols

[0039] Human body detection circuit 100 Conductive component 110

[0040] Filter circuit 120 Detection circuit 130

[0041] Control circuit 140 First resistor R1

[0042] The first electrode sheet 111 and the second electrode sheet 112

[0043] The second resistor R2 The first capacitor C1

[0044] Amplifier circuit 150 Third resistor R3

[0045] First switch component Q1 Second switch component Q2

[0046] The third switch component Q3 and the fourth switch component Q4

[0047] Voltage divider circuit 160 Current detection circuit 170

[0048] Fourth resistor R4 Driving circuit 200

[0049] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] The following description will refer to the accompanying drawings to more fully describe the content of the present application. Shown in the accompanying drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. Similar reference numerals represent identical or similar components.

[0051] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present application. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include the plural forms. In addition, when used herein, "including" and / or "comprising" and / or "having", integers, steps, operations, components and / or components, but do not exclude the existence or addition of one or more other features, regions, integers, steps, operations, components and / or groups thereof.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. In addition, unless explicitly defined herein, terms such as those defined in general dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant technology and the content of this application, and will not be interpreted as an idealized or overly formal meaning.

[0053] The following will describe exemplary embodiments in conjunction with the accompanying drawings. It should be noted that the components depicted in the reference drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar technical terms.

[0054] Reference Figure 1 The present application proposes a human body detection circuit 100, which includes a conductive component 110, a filter circuit 120, a detection circuit 130 and a control circuit 140. The conductive component 110 is used to contact human skin. The detection circuit 130 is electrically connected to the filter circuit 120, and the detection circuit 130 is used to output a detection signal detected when the conductive component 110 contacts human skin to the filter circuit 120. The filter circuit 120 is used to filter the detection signal and output the filtered detection signal. The control circuit 140 is electrically connected to the filter circuit 120; the control circuit 140 is used to output a drive signal according to the filtered detection signal.

[0055] In the present application, the human body detection circuit 100 can be applied to power output devices in all beauty equipment, such as radio frequency output devices, micro current output devices, light energy output devices, ultrasonic output devices, etc. The following embodiments are described only by using radio frequency output devices as an example.

[0056] In this embodiment, the radio frequency output device can be a radio frequency functional module provided in beauty equipment such as a beauty instrument and a hair removal instrument, and the radio frequency output device can also include a driving circuit 200. The conductive component 110 can be implemented by a metal electrode sheet. The control circuit 140 can be implemented by an existing chip with a control function, such as a microprocessor, an FPGA chip, or other chips with a control function. The control function implemented by the control circuit 140 in the embodiment of the present application does not involve program improvements. When the conductive component 110 is not in contact with the human body, there is no current in the detection circuit 130, and the control circuit 140 does not output a driving signal. After the conductive component 110 comes into contact with human skin, the human body, the conductive component 110, the detection circuit 130, and the filter circuit 120 form a loop, and the detection circuit 130 generates a detection signal by detecting the current / voltage signal in the loop, and outputs it to the control circuit 140 after filtering by the filter circuit 120. The control circuit 140 determines that the conductive component 110 has contacted the human body according to the detection signal. At this time, the control circuit 140 outputs a driving signal to control the driving circuit 200 to output a radio frequency signal (such as a light wave or a current, etc.) to the conductive component 110 to act on the human skin, or the radio frequency signal with gradually increasing output power acts on the human skin. In this way, the radio frequency signal is output after the conductive component 110 contacts the human body, which can avoid the power output before the current signal acts on the human body, thereby reducing power consumption.

[0057] In one embodiment, the detection circuit 130 includes a first resistor R1; the first end of the conductive component 110 is used to access the power supply voltage, and the second end of the conductive component 110 is electrically connected to the first end of the first resistor R1. The first end of the first resistor R1 is electrically connected to the filter circuit 120, and the second end of the first resistor R1 is grounded; the first end of the first resistor R1 is used to output a voltage signal when the human body is connected. The filter circuit 120 is used to filter the voltage signal; the control circuit 140 is used to output the drive signal according to the filtered voltage signal.

[0058] In this embodiment, the conductive component 110 may include a first electrode sheet 111 and a second electrode sheet 112. The first electrode sheet 111 is used to access a power supply voltage, such as a power supply voltage of a radio frequency device. The second electrode sheet 112 is electrically connected to a first end of the first resistor R1. When the first electrode sheet 111 and the second electrode sheet 112 are not in contact with the human body, the first electrode sheet 111 and the second electrode sheet 112 can be regarded as an open circuit, there is no current at the first end of the first resistor R1, and the control circuit 140 detects a low level. When the first electrode sheet 111 and the second electrode sheet 112 are in contact with the human body, the first electrode sheet 111 and the second electrode sheet 112 are connected through the human skin, and the power supply voltage passes through the first electrode sheet 111, the human epidermis, the second electrode sheet 112 and the first resistor R1 to the ground. The human epidermis and the first resistor R1 form a voltage divider circuit 160, and a voltage divider voltage is formed at the first end of the first resistor R1, and is output to the control circuit 140. The control circuit 140 determines that the conductive component 110 is in contact with the human skin according to the voltage divider voltage.

[0059] In one embodiment, the filter circuit 120 includes a second resistor R2 and a first capacitor C1. The first end of the second resistor R2 is electrically connected to the first end of the first resistor R1, and the second end of the second resistor R2 is electrically connected to the control circuit 140; the first end of the first capacitor C1 is electrically connected to the second end of the second resistor R2, and the second end of the first capacitor C1 is grounded.

[0060] In this embodiment, the charging characteristic of the first capacitor C1 is used to filter the voltage signal at the first end of the first resistor R1 to eliminate spikes in the voltage signal, so that the voltage signal transmitted to the control circuit 140 is smoother and has better signal quality.

[0061] Reference Figure 2 In one embodiment, the human body detection circuit 100 further includes an amplifier circuit 150. The input end of the amplifier circuit 150 is electrically connected to the filter circuit 120, and the output end of the amplifier circuit 150 is electrically connected to the control circuit 140; the amplifier circuit 150 is used to amplify and output the filtered detection signal.

[0062] In this embodiment, the amplifier circuit 150 can be implemented by an amplifier, for example, an operational amplifier chip of the type DP321, DP358, etc. During detection, there may be a situation where the detection signal is small, and the detection signal is amplified by the amplifier to facilitate the controller to collect the detection signal and improve the detection accuracy.

[0063] Reference Figure 3In one embodiment, the detection circuit 130 includes a third resistor R3. The first end and the second end of the third resistor R3 are both used to access the power supply voltage, and the second end of the third resistor R3 is also electrically connected to the control circuit 140. The drive circuit 200 is electrically connected to the conductive component 110; the drive circuit 200 is used to form a loop with the detection circuit 130 and the human skin when the conductive component 110 is in contact with the human skin.

[0064] In this embodiment, when the first electrode sheet 111 and the second electrode sheet 112 of the conductive component 110 are in contact with the human body, the first electrode sheet 111 and the second electrode sheet 112 are connected by the human skin. The third resistor R3, the drive circuit 200, the first electrode sheet 111, the human skin and the second electrode sheet 112 form a loop. The power supply voltage is output from the second end of the third resistor R3 to the drive circuit 200 for power supply. At this time, the control circuit 140 can determine that the conductive component 110 has contacted the human skin by detecting the high voltage at the second end of the third resistor R3, and then outputs a drive signal to control the drive circuit 200 to output a radio frequency signal, and acts on the human skin through the conductive component 110.

[0065] In one embodiment, the driving circuit 200 includes a first switch component Q1, a second switch component Q2, a third switch component Q3, and a fourth switch component Q4. The first end of the first switch component Q1, the first end of the second switch component Q2, the first end of the third switch component Q3, and the first end of the fourth switch component Q4 are all electrically connected to the control circuit 140. The second end of the first switch component Q1 is electrically connected to the second end of the third resistor R3, the third end of the first switch component Q1 is electrically connected to the second end of the second switch component Q2, and the third end of the second switch component Q2 is grounded; the third end of the first switch component Q1 is also electrically connected to the first end of the conductive component 110. The second end of the third switch component Q3 is electrically connected to the second end of the third resistor R3, the third end of the third switch component Q3 is electrically connected to the second end of the fourth switch component Q4, and the third end of the fourth switch component Q4 is grounded; the third end of the third switch component Q3 is also electrically connected to the second end of the conductive component 110. The control circuit 140 is used to control the first switch component Q1 and the fourth switch component Q4 to be turned on, and the third switch component Q3 and the second switch component Q2 to be turned off; or, control the first switch component Q1 and the fourth switch component Q4 to be turned off, and the third switch component Q3 and the second switch component Q2 to be turned on.

[0066] In this embodiment, the control circuit 140 can control the operation of the first switch component Q1, the second switch component Q2, the third switch component Q3 and the fourth switch component Q4 by outputting a PWM signal. For example, when the PWM signal is at a high level, the first switch component Q1 and the fourth switch component Q4 are turned on, and the third switch component Q3 and the second switch component Q2 are turned off. At this time, the power supply voltage passes through the first switch component Q1, the first electrode sheet 111, the second electrode sheet 112 and the fourth switch component Q4 to the ground. When the PWM signal is at a low level, the first switch component Q1 and the fourth switch component Q4 are turned off, and the third switch component Q3 and the second switch component Q2 are turned on. At this time, the power supply voltage passes through the third switch component Q3, the second electrode sheet 112, the first electrode sheet 111 and the second switch component Q2 to the ground. In this way, under the control of the PWM signal, the four switch components are alternately turned on, and the output square wave AC signal acts on the human skin.

[0067] In one embodiment, the human body detection circuit 100 further includes a voltage divider circuit 160. An input end of the voltage divider circuit 160 is electrically connected to the second end of the third resistor R3, and an output end of the voltage divider circuit 160 is electrically connected to the control circuit 140. The voltage divider circuit 160 is used to divide the voltage of the second end of the third resistor R3 to obtain a voltage divider signal and output it to the control circuit 140. The control circuit 140 is used to output the drive signal according to the voltage divider signal output by the voltage divider circuit 160.

[0068] In this embodiment, the voltage divider circuit 160 can be implemented by using a voltage divider resistor. When the third resistor R3, the drive circuit 200, the first electrode sheet 111, the human skin and the second electrode sheet 112 form a loop, the third resistor R3 and the voltage divider resistor divide the supply voltage and form a voltage divider voltage at the second end of the third resistor R3. The control circuit 140 can determine whether the conductive component 110 has contacted the human body by collecting the voltage divider voltage.

[0069] Reference Figure 4 In one embodiment, the human body detection circuit 100 further includes a current detection circuit 170. The detection end of the current detection circuit 170 is electrically connected to the third resistor R3, and the output end of the current detection circuit 170 is electrically connected to the control circuit 140; the current detection circuit 170 is used to detect the current output by the third resistor R3, and convert the detected current into a voltage signal and output it to the control circuit 140. The control circuit 140 is used to output the drive signal according to the voltage signal output by the current detection circuit 170.

[0070] In this embodiment, the current detection circuit 170 can be implemented by using a resistor, a current sampling chip, etc. When the third resistor R3, the driving circuit 200, the first electrode sheet 111, the human skin, and the second electrode sheet 112 form a loop, the current detection circuit 170 collects the current value flowing through the third resistor R3 and outputs it to the control circuit 140, and the control circuit 140 can determine that the conductive component 110 has contacted the human body.

[0071] In one embodiment, the human body detection circuit 100 further includes a fourth resistor R4. A first end of the fourth resistor R4 is electrically connected to the third end of the second switch component Q2 and the third end of the fourth switch component Q4, and a second end of the fourth resistor R4 is grounded.

[0072] In this embodiment, when the first electrode sheet 111 and the second electrode sheet 112 of the conductive component 110 are in contact with the human body, the third resistor R3, the driving circuit 200, the first electrode sheet 111, the human skin, the second electrode sheet 112 and the fourth resistor R4 form a loop, and the control circuit 140 can determine whether the conductive component 110 is in contact with the human skin by collecting the voltage or current across the fourth resistor R4.

[0073] The present application further proposes a radio frequency output device, comprising a driving circuit 200 and the above-mentioned human body detection circuit 100 , wherein the driving signal output by the human body detection circuit 100 is used to drive the driving circuit 200 to output a radio frequency signal to the conductive component 110 .

[0074] The detailed structure of the human body detection circuit 100 can refer to the above-mentioned embodiment, which will not be described in detail here; it can be understood that since the above-mentioned human body detection circuit 100 is used in the radio frequency output device of the present application, the embodiment of the radio frequency output device of the present application includes all technical solutions of all embodiments of the above-mentioned human body detection circuit 100, and the technical effects achieved are also exactly the same, which will not be described in detail here.

[0075] In the above, the specific implementation of the present application is described with reference to the accompanying drawings. However, those skilled in the art will appreciate that various changes and substitutions may be made to the specific implementation of the present application without departing from the spirit and scope of the present application. These changes and substitutions are all within the scope defined by the present application.

Claims

1. A human body detection circuit, characterized in that: The human body detection circuit comprises: Conductive components, used for contacting with human skin; Filter circuit; A detection circuit, electrically connected to the filter circuit, the detection circuit being used to output a detection signal detected when the conductive component is in contact with human skin to the filter circuit; The filtering circuit is used to filter the detection signal and output the filtered detection signal; A control circuit is electrically connected to the filter circuit; the control circuit is used to output a drive signal according to the filtered detection signal.

2. The human body detection circuit according to claim 1, characterized in that: The detection circuit comprises a first resistor; the first end of the conductive component is used to access the power supply voltage, and the second end of the conductive component is electrically connected to the first end of the first resistor; The first end of the first resistor is electrically connected to the filter circuit, and the second end of the first resistor is grounded; the first end of the first resistor is used to output a voltage signal when the human body is connected; The filtering circuit is used to filter the voltage signal; The control circuit is used to output the driving signal according to the filtered voltage signal.

3. The human body detection circuit as claimed in claim 2, characterized in that: The filtering circuit includes a second resistor and a first capacitor; The first end of the second resistor is electrically connected to the first end of the first resistor, and the second end of the second resistor is electrically connected to the control circuit; the first end of the first capacitor is electrically connected to the second end of the second resistor, and the second end of the first capacitor is grounded.

4. The human body detection circuit according to claim 1, characterized in that: The human body detection circuit also includes an amplification circuit; The input end of the amplifier circuit is electrically connected to the filter circuit, and the output end of the amplifier circuit is electrically connected to the control circuit; the amplifier circuit is used to amplify and output the filtered detection signal.

5. The human body detection circuit according to claim 1, characterized in that: The human body detection circuit is used in a radio frequency output device, and the radio frequency output device also includes a driving circuit; the detection circuit includes a third resistor; The first end and the second end of the third resistor are both used to access the power supply voltage, and the second end of the third resistor is also electrically connected to the control circuit; The driving circuit is electrically connected to the conductive component; the driving circuit is used to form a loop with the detection circuit and the human skin when the conductive component is in contact with the human skin.

6. The human body detection circuit as claimed in claim 5, characterized in that: The driving circuit includes a first switch component, a second switch component, a third switch component and a fourth switch component; The first end of the first switch component, the first end of the second switch component, the first end of the third switch component and the first end of the fourth switch component are all electrically connected to the control circuit; The second end of the first switch component is electrically connected to the second end of the third resistor, the second end of the first switch component is electrically connected to the second end of the second switch component, and the third end of the second switch component is grounded; the third end of the first switch component is also electrically connected to the first end of the conductive component; The second end of the third switch component is electrically connected to the second end of the third resistor, the second end of the third switch component is electrically connected to the second end of the fourth switch component, and the third end of the fourth switch component is grounded; the third end of the third switch component is also electrically connected to the second end of the conductive component; The control circuit is used to control the first switch component and the fourth switch component to be turned on, and the third switch component and the second switch component to be turned off; or to control the first switch component and the fourth switch component to be turned off, and the third switch component and the second switch component to be turned on.

7. The human body detection circuit according to claim 5, characterized in that: Also included is a voltage divider circuit; The input end of the voltage divider circuit is electrically connected to the second end of the third resistor, and the output end of the voltage divider circuit is electrically connected to the control circuit. The voltage divider circuit is used to divide the voltage of the second end of the third resistor to obtain a voltage divider signal and output it to the control circuit. The control circuit is used to output the drive signal according to the voltage divider signal output by the voltage divider circuit.

8. The human body detection circuit according to claim 5, characterized in that: Also included is a current detection circuit; The detection end of the current detection circuit is electrically connected to the third resistor, and the output end of the current detection circuit is electrically connected to the control circuit; the current detection circuit is used to detect the current output by the third resistor, and convert the detected current into a voltage signal and output it to the control circuit; The control circuit is used for outputting the driving signal according to the voltage signal output by the current detection circuit.

9. The human body detection circuit according to claim 6, characterized in that: The human body detection circuit also includes a fourth resistor; A first end of the fourth resistor is electrically connected to both the third end of the second switch component and the third end of the fourth switch component, and a second end of the fourth resistor is grounded.

10. A radio frequency output device, characterized in that: It comprises a driving circuit and a human body detection circuit as claimed in any one of claims 1 to 9, wherein the driving signal output by the human body detection circuit is used to drive the driving circuit to output a radio frequency signal to the conductive component.

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