Over-current protection circuit of skin detector

Abstract

The utility model provides an over-current protection circuit of skin detector, including over-current detection element, switch module, current amplifier and singlechip, over-current detection element and switch module series connection in skin detector's main circuit, current amplifier's input terminal connects over-current detection element and switch module's contact, the output terminal connects singlechip, current amplifier's current amplifier is connected with the singlechip, current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier's current amplifier. The level output end of the single-chip microcomputer is connected with the controlled end of the switch module. When the skin detector is used, the switch module is conducted to enable the main circuit of the skin detector to start to work, the current amplifier amplifies a current signal flowing through the current detection element at the moment and then inputs the current signal into the single chip microcomputer, and if the amplified current is larger than a preset protection value, it means that the working current of the skin detector is too large; therefore, the single-chip microcomputer outputs high level to the switch module through the level output end of the single-chip microcomputer, so that the switch module is switched off, a main circuit of the skin detector is switched off, and the skin detector is prevented from working in an overcurrent state.

Description

Technical Field

[0001] The utility model relates to the technical field of skin detection, in particular to an overcurrent protection circuit of a skin detector. Background Art

[0002] A skin analyzer is an instrument used to examine the skin. It uses different light sources to capture images of localized skin in different spectra, generating multiple spectral images. This allows doctors to analyze localized skin problems from these spectral images, improving the effectiveness of diagnosis and treatment. It can also amplify localized skin images, enabling doctors to better observe and diagnose skin problems. During operation, if the main circuit of a skin analyzer is overloaded or short-circuited, overcurrent may occur, which can easily damage circuit components. Utility Model Content

[0003] The technical problem to be solved by the utility model is how to avoid overcurrent in the main circuit of a skin detector.

[0004] To solve the above technical problems, the present invention provides an overcurrent protection circuit for a skin detector, comprising an overcurrent detection element, a switch module, a current amplifier, and a single-chip microcomputer. The overcurrent detection element and the switch module are connected in series in the main circuit of the skin detector. The input end of the current amplifier is connected to the contact between the overcurrent detection element and the switch module, and the output end is connected to the single-chip microcomputer. The level output end of the single-chip microcomputer is connected to the controlled end of the switch module.

[0005] Furthermore, the switch module includes a first field-effect transistor and a second field-effect transistor, the conductive channel of the first field-effect transistor is connected in series between the power supply terminal and the ground terminal, and the gate is the controlled end of the switch module; the conductive channel of the second field-effect transistor is connected in series in the main circuit of the skin detector, and the gate is connected to the contact between the first field-effect transistor and the power supply terminal.

[0006] Furthermore, the drain of the first field effect transistor is connected to the power supply terminal, and the source is connected to the ground terminal; the drain of the second field effect transistor is connected to the main circuit of the skin detector, and the source is connected to the ground terminal.

[0007] Furthermore, the first field effect transistor and / or the second field effect transistor is an N-channel field effect transistor.

[0008] Furthermore, the overcurrent detection element and the switch module are connected in series in the main circuit of the skin detector. The specific implementation structure is: including a connector, the connector includes a first pin for connecting to the positive terminal of the skin detector main circuit and a second pin for connecting to the negative terminal of the skin detector main circuit, the first pin is connected to the power supply terminal, and the second pin is connected to the ground terminal of the overcurrent detection element through the switch module.

[0009] The utility model has the following beneficial effects: when the skin detector is in use, the switch module is turned on to enable the main circuit of the skin detector to start working. At this time, the current amplifier amplifies the current signal flowing through the current detection element and then inputs it into the single-chip microcomputer. If the amplified current is greater than the preset protection value, it means that the operating current of the skin detector is too large. Therefore, the single-chip microcomputer outputs a high level to the switch module through its level output terminal, turning off the switch module, thereby disconnecting the main circuit of the skin detector and preventing the skin detector from operating in an overcurrent state. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the circuit schematic diagram of the overcurrent protection circuit of the skin detector. DETAILED DESCRIPTION

[0011] The present invention is further described in detail below in conjunction with specific embodiments.

[0012] The overcurrent protection circuit of the skin detector is as follows: Figure 1 As shown, it includes an overcurrent detection element R1, a switch module, a current amplifier U1B, a single-chip computer U1 and a connector J12, wherein the overcurrent detection element R1 is specifically a resistor, and the switch module includes a first field effect transistor Q1, a second field effect transistor Q2, a resistor R2, a resistor R3 and a resistor R4, and the first field effect transistor Q1 and the second field effect transistor Q2 are both N-channel field effect transistors.

[0013] It should be noted that the skin analyzer is an instrument used to analyze skin. Its main circuit includes a camera module, a light source module, and a display module. The light source module emits different light sources to illuminate the local skin. The camera module then captures images of different spectra to generate multiple spectral images, which are displayed on the display module. This allows doctors to analyze local skin problems from the multiple spectral images, improving the effectiveness of their diagnosis and treatment. The display module can also amplify local skin images, facilitating better observation and diagnosis of skin problems. The overcurrent detection element R1 and the switch module are connected in series within the skin analyzer's main circuit, specifically via connector J12. Connector J12 includes first pins 6 and 7 for connecting to the positive terminal of the skin analyzer's main circuit and second pins 8 and 9 for connecting to the negative terminal of the skin analyzer's main circuit. First pins 6 and 7 are connected to the power supply terminal X86-19V, while second pins 8 and 9 are connected to the ground terminal DGND via the switch module and the overcurrent detection element R1. This ensures that the overcurrent detection element R1 and the switch module are connected in series within the skin analyzer's main circuit.

[0014] Current amplifier U1B has a positive input pin, a negative input pin, and an output pin. Its positive input pin is connected to the input terminal ADC via resistor R5. The input terminal ADC is connected to the junction between the overcurrent detection element R1 and the switch module. The negative input pin is connected to ground GND via resistor R6. The output pin is connected to the output terminal ADC-1 via resistor R7. Resistor R8 is connected between the output pin and the negative input pin. Output terminal ADC-1 of current amplifier U1B is connected to input pin P2.1 of microcontroller U1. Pin P2.7 of microcontroller U1 is the level output terminal EN, which is connected to the gate G of the first field-effect transistor Q1 via resistor R2. In the switch module, gate G of the first field-effect transistor Q1 serves as the controlled terminal of the switch module. Therefore, level output terminal EN of microcontroller U1 is connected to the controlled terminal of the switch module. The conductive channel of the first FET Q1 is connected between its source S and drain D. Its drain D is connected to the DC12V power supply via resistors R3 and R4, and its source S is connected to ground GND. Thus, the conductive channel of the first FET Q1 is connected in series between the DC12V power supply and ground GND. The conductive channel of the second FET Q2 is connected between its source S and drain D. Its drain D is connected to the main circuit of the skin analyzer, and its source S is connected to ground DGND via current detection element R1. Thus, the conductive channel of the second FET Q2 is connected in series with the main circuit of the skin analyzer. The gate G of the second FET Q2 is connected to the junction between resistors R3 and R4, that is, the gate G of the second FET Q2 is connected to the junction between the first FET Q1 and the DC12V power supply.

[0015] When the skin detector is in use, the first field-effect transistor Q1 of the switch module is turned off and the second field-effect transistor Q2 is turned on, causing the skin detector's main circuit to start operating. At this time, the main circuit current will flow through the current detection element R1. The current amplifier U1B amplifies the current signal flowing through the current detection element R1 and then inputs it into the microcontroller U1. The microcontroller U1 determines whether the current is greater than the preset protection value. If the amplified current is not greater than the preset protection value, the microcontroller U1 remains in its original state. If the amplified current is greater than the preset protection value, it means that the operating current of the skin detector is too large. Therefore, the microcontroller U1 outputs a high level through its level output terminal EN to the controlled end of the switch module, that is, to the gate G of the first field-effect transistor Q1. After receiving the high level, the conductive channel between the drain D and the source S of the first field-effect transistor Q1 is connected, causing the first field-effect transistor Q1 to turn on and operate. The conduction of the first field-effect transistor Q1 will pull down the level of the gate G of the second field-effect transistor Q2, thereby disconnecting the conductive channel between the drain D and the source S of the second field-effect transistor Q2, causing the second field-effect transistor Q2 to turn off and stop operating. That is, the switch module connected in series with the main circuit of the skin detector is turned off, thereby disconnecting the main circuit of the skin detector and preventing the skin detector from operating in an overcurrent state.

[0016] The above is only an embodiment of the present invention and does not limit the scope of patent protection. Those skilled in the art can make non-substantial changes or substitutions based on the present invention and still fall within the scope of patent protection.

Claims

1. The overcurrent protection circuit of the skin detector is characterized by: The device comprises an overcurrent detection element, a switch module, a current amplifier, and a single-chip microcomputer. The overcurrent detection element and the switch module are connected in series in the main circuit of the skin detector. The specific implementation structure is as follows: a connector comprising a first pin for connecting to the positive terminal of the skin detector main circuit and a second pin for connecting to the negative terminal of the skin detector main circuit. The first pin is connected to the power supply terminal, and the second pin is connected to the overcurrent detection element via the switch module and connected to the ground terminal. The input end of the current amplifier is connected to the connection between the overcurrent detection element and the switch module, and the output end is connected to the single-chip microcomputer. The level output end of the single-chip microcomputer is connected to the controlled end of the switch module. The switch module comprises a first field-effect transistor and a second field-effect transistor. The conductive channel of the first field-effect transistor is connected in series between the power supply terminal and the ground terminal, the gate is the controlled end of the switch module, the drain is connected to the power supply terminal, and the source is connected to the ground terminal. The conductive channel of the second field-effect transistor is connected in series in the main circuit of the skin detector, the gate is connected to the connection between the first field-effect transistor and the power supply terminal, the drain is connected to the main circuit of the skin detector, and the source is connected to the ground terminal.

2. The overcurrent protection circuit according to claim 1, wherein: The first field effect transistor and / or the second field effect transistor is an N-channel field effect transistor.

Images