Signal conditioning circuit

Abstract

The utility model discloses a signal conditioning circuit which comprises a first amplification circuit, a first comparison circuit, a second amplification circuit, a second comparison circuit and an output circuit. An actual radio frequency current and a set radio frequency current are accessed through a first comparison circuit, and then an undetermined radio frequency current is output; a set radio frequency voltage and an actual radio frequency voltage are accessed through a second comparison circuit, and then an undetermined radio frequency voltage is output; the output circuit receives the to-be-determined radio frequency current and the to-be-determined radio frequency voltage and outputs a level signal to the radio frequency board; according to the application, corresponding adjustment can be carried out according to the radio frequency current corresponding to the actually output radio frequency signal, so that the output radio frequency electromagnetic wave can be adaptively changed according to the actual situation, the stimulation effect on the skin is ensured, and the use efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal regulation, in particular to a signal regulation circuit. Background Art

[0002] As a skin care device, a beauty instrument generally acts on the deep tissue of the skin through radio frequency electromagnetic waves to heat the dermis of the skin. In the prior art, the level signal of the radio frequency electromagnetic wave output in the beauty instrument is fixed, and cannot be adjusted accordingly according to the radio frequency current corresponding to the actual output radio frequency signal, which results in the output radio frequency electromagnetic wave being unable to adaptably change according to the actual situation, affecting the stimulation effect on the skin and reducing the efficiency of use. Utility Model Content

[0003] Based on this, it is necessary to propose a signal conditioning circuit to address the above problems.

[0004] A signal conditioning circuit comprising:

[0005] a first amplifier circuit, whose input end is connected to the main control circuit, and whose output end is connected to the input end of the first comparison circuit, and is used to receive the set radio frequency current output by the main control circuit, and amplify the set radio frequency current and output it to the first comparison circuit;

[0006] The first comparison circuit has an input end connected to the RF board and an output end connected to the input end of the output circuit, and is used to receive the set RF current after amplification, obtain the actual RF current of the RF board, and output the undetermined RF current to the output circuit;

[0007] a second amplifier circuit, whose input end is connected to the main control circuit and whose output end is connected to the input end of the second comparison circuit, and is used to receive the set RF voltage output by the main control circuit, and amplify the set RF voltage and output it to the second comparison circuit;

[0008] The second comparison circuit has an input end connected to the RF board and an output end connected to the input end of the output circuit, and is used to receive the set RF voltage after amplification, obtain the actual RF voltage of the RF board, and output the undetermined RF voltage to the output circuit;

[0009] The output circuit, whose output end is connected to the radio frequency board, is used to receive the to-be-determined radio frequency current and the to-be-determined radio frequency voltage, and output a level signal to the radio frequency board.

[0010] In one embodiment, the first amplifying circuit includes: a first resistor, a first capacitor, a second capacitor and a first operational amplifier;

[0011] The non-inverting input terminal of the first operational amplifier is connected to one end of the first resistor, the inverting input terminal of the first operational amplifier is connected to one end of the first capacitor, and the output terminal of the first operational amplifier is connected to the input terminal of the first comparison circuit;

[0012] The other end of the first resistor and the other end of the first capacitor are both connected to the output end of the main control circuit;

[0013] One end of the second capacitor is connected to the non-inverting input terminal of the first operational amplifier, and the other end is grounded.

[0014] In one embodiment, the first comparison circuit includes: a second operational amplifier;

[0015] The inverting input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the actual radio frequency current, and the output terminal of the second operational amplifier is connected to the input terminal of the output circuit.

[0016] In one embodiment, the first comparison circuit further includes: a second resistor and a third resistor;

[0017] The second resistor is connected between the non-inverting input terminal of the second operational amplifier and the output terminal of the first operational amplifier;

[0018] One end of the third resistor is connected to the actual radio frequency current, and the other end is connected to the non-inverting input terminal of the second operational amplifier.

[0019] In one embodiment, the first comparison circuit further includes: a third capacitor, a fourth capacitor and a fourth resistor;

[0020] One end of the third capacitor is connected to the non-inverting input terminal of the second operational amplifier, and the other end is connected to the output terminal of the second operational amplifier;

[0021] One end of the fourth resistor is connected to the non-inverting input terminal of the second operational amplifier, the other end of the fourth resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the output terminal of the second operational amplifier.

[0022] In one embodiment, the second amplifying circuit includes: a fifth resistor, a fifth capacitor, a sixth capacitor and a third operational amplifier;

[0023] The non-inverting input terminal of the third operational amplifier is connected to one end of the fifth resistor, the inverting input terminal of the third operational amplifier is connected to one end of the fifth capacitor, and the output terminal of the third operational amplifier is connected to the input terminal of the second comparison circuit;

[0024] The other end of the fifth resistor and the other end of the fifth capacitor are both connected to the output end of the main control circuit;

[0025] One end of the sixth capacitor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded.

[0026] In one embodiment, the second comparison circuit comprises: a fourth operational amplifier;

[0027] The inverting input terminal of the fourth operational amplifier is connected to the output terminal of the third operational amplifier, the non-inverting input terminal of the fourth operational amplifier is connected to the actual radio frequency voltage, and the output terminal of the fourth operational amplifier is connected to the input terminal of the output circuit.

[0028] In one embodiment, the second comparison circuit further includes: a sixth resistor and a seventh resistor;

[0029] The sixth resistor is connected between the non-inverting input terminal of the fourth operational amplifier and the output terminal of the third operational amplifier;

[0030] One end of the seventh resistor is connected to the actual radio frequency voltage, and the other end is connected to the non-inverting input terminal of the fourth operational amplifier.

[0031] In one embodiment, the second comparison circuit further includes: a seventh capacitor, an eighth capacitor and an eighth resistor;

[0032] One end of the seventh capacitor is connected to the non-inverting input terminal of the fourth operational amplifier, and the other end is connected to the output terminal of the fourth operational amplifier;

[0033] One end of the eighth resistor is connected to the non-inverting input terminal of the fourth operational amplifier, the other end of the eighth resistor is connected to one end of the eighth capacitor, and the other end of the eighth capacitor is connected to the output terminal of the fourth operational amplifier.

[0034] In one embodiment, the output circuit includes: a multivibrator, a first diode, a second diode, a third diode, a triode, a ninth resistor, a tenth resistor, a ninth capacitor and a fourth diode;

[0035] The anode of the first diode is connected to the output end of the first comparison circuit, and the cathode of the first diode is connected to the base of the transistor;

[0036] The anode of the second diode is connected to the output end of the second comparison circuit, and the cathode of the second diode is connected to the base of the transistor;

[0037] The anode of the third diode is connected to the main control circuit, and the cathode of the third diode is connected to the base of the transistor;

[0038] The collector of the triode is connected to the second pin of the multivibrator and one end of the ninth resistor;

[0039] The other end of the ninth resistor is connected to the fourth pin and the eighth pin of the multivibrator;

[0040] One end of the tenth resistor is connected to the other end of the ninth resistor, the other end of the tenth resistor is connected to one end of the ninth capacitor, and the other end of the ninth capacitor is grounded;

[0041] The anode of the fourth diode is connected to the other end of the ninth resistor, and the cathode of the fourth diode is connected to the fifth pin of the multivibrator.

[0042] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0043] The present application receives the set RF current output by the main control circuit through the first amplifier circuit, and amplifies the set RF current and outputs it to the first comparison circuit; the first comparison circuit receives the set RF current and the actual RF current, and outputs the pending RF current to the output circuit; the second amplifier circuit receives the set RF voltage output by the main control circuit, and amplifies the set RF voltage and outputs it to the second comparison circuit; the second comparison circuit receives the set RF voltage and the actual RF voltage, and outputs the pending RF voltage to the output circuit; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board. The actual RF current and the set RF current are connected through the first comparison circuit, and the pending RF current is output; the set RF voltage and the actual RF voltage are connected through the second comparison circuit, and the pending RF voltage is output; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board; the present application can make corresponding adjustments according to the RF current corresponding to the actual output RF signal, so that the output RF electromagnetic wave can be adaptively changed according to the actual situation, ensuring the stimulation effect on the skin and improving the use efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] in:

[0046] Figure 1 is a structural block diagram of a signal conditioning circuit in one embodiment;

[0047] Figure 24 is a circuit diagram of a first amplifier circuit, a first comparison circuit, a second amplifier circuit, a second comparison circuit and an output circuit in one embodiment. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0049] As a skin care device, a beauty instrument generally acts on the deep tissue of the skin through radio frequency electromagnetic waves, heats the dermis of the skin, stimulates the production of new collagen and elastin, and thus achieves a beauty method of tightening the skin; in the prior art, the level signal of the radio frequency electromagnetic wave output in the beauty instrument is fixed, and cannot be adjusted accordingly according to the radio frequency current corresponding to the actual output radio frequency signal, which results in the output radio frequency electromagnetic wave being unable to adapt to the actual situation, affecting the stimulation effect on the skin and reducing the use efficiency. In order to solve the above technical problems, the present application provides a signal adjustment circuit, such as Figure 1As shown, it includes: a first amplifier circuit 10, a first comparison circuit 20, a second amplifier circuit 30, a second comparison circuit 40 and an output circuit 50, wherein the input end of the first amplifier circuit 10 is connected to the main control circuit, and the output end is connected to the input end of the first comparison circuit 20, for receiving the set RF current output by the main control circuit, and amplifying the set RF current and outputting it to the first comparison circuit 20; the input end of the first comparison circuit 20 is connected to the RF board, and the output end is connected to the input end of the output circuit 50, for receiving the amplified set RF current, obtaining the actual RF current of the RF board, and outputting the to-be-determined RF current to the output circuit 50; the input end of the second amplifier circuit 30 is connected to the main control circuit, and the output end is connected to the second The input end of the comparison circuit 40 is connected to receive the set RF voltage output by the main control circuit, and amplifies the set RF voltage and outputs it to the second comparison circuit 40; the input end of the second comparison circuit 40 is connected to the RF board, and the output end is connected to the input end of the output circuit 50, and is used to receive the amplified set RF voltage, obtain the actual RF voltage of the RF board, and output the pending RF voltage to the output circuit 50; the output end of the output circuit 50 is connected to the RF board, and is used to receive the pending RF current and the pending RF voltage, and output a level signal to the RF board. The output of the high level signal represents that the RF current / voltage exceeds the set limit or the power supply is overcurrent, and the circuit protection is required, which will shut down the RF driver. The present application receives the set RF current output by the main control circuit through the first amplifier circuit, and amplifies the set RF current and outputs it to the first comparison circuit; the first comparison circuit receives the set RF current and the actual RF current, and outputs the pending RF current to the output circuit; the second amplifier circuit receives the set RF voltage output by the main control circuit, and amplifies the set RF voltage and outputs it to the second comparison circuit; the second comparison circuit receives the set RF voltage and the actual RF voltage, and outputs the pending RF voltage to the output circuit; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board. The actual RF current and the set RF current are connected through the first comparison circuit, and the pending RF current is output; the set RF voltage and the actual RF voltage are connected through the second comparison circuit, and the pending RF voltage is output; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board; the present application can make corresponding adjustments according to the RF current corresponding to the actual output RF signal, so that the output RF electromagnetic wave can be adaptively changed according to the actual situation, ensuring the stimulation effect on the skin and improving the use efficiency.

[0050] In one embodiment, Figure 2As shown, the first amplifier circuit 10 includes: a first resistor R170, a first capacitor C105, a second capacitor C104 and a first operational amplifier U21A; wherein, the non-inverting input terminal of the first operational amplifier U21A is connected to one end of the first resistor R170, the inverting input terminal of the first operational amplifier U21A is connected to one end of the first capacitor C105, and the output terminal of the first operational amplifier U21A is connected to the input terminal of the first comparison circuit 20; the other end of the first resistor R170 and the other end of the first capacitor C105 are both connected to the output terminal of the main control circuit; one end of the second capacitor C104 is connected to the non-inverting input terminal of the first operational amplifier U21A, and the other end is grounded.

[0051] In one embodiment, Figure 2 As shown, the first comparison circuit 20 includes: a second operational amplifier U21B; wherein, the inverting input terminal of the second operational amplifier U21B is connected to the output terminal of the first operational amplifier U21A, the non-inverting input terminal of the second operational amplifier U21B is connected to the actual RF current, and the output terminal of the second operational amplifier U21B is connected to the input terminal of the output circuit 50.

[0052] In one embodiment, Figure 2 As shown, the first comparison circuit 20 also includes: a second resistor R172 and a third resistor R174; wherein the second resistor R172 is connected between the in-phase input terminal of the second operational amplifier U21B and the output terminal of the first operational amplifier U21A; one end of the third resistor R174 is connected to the actual RF current, and the other end is connected to the in-phase input terminal of the second operational amplifier U21B.

[0053] In one embodiment, Figure 2 As shown, the first comparison circuit 20 also includes: a third capacitor C108, a fourth capacitor C109 and a fourth resistor R180; wherein, one end of the third capacitor C108 is connected to the non-inverting input terminal of the second operational amplifier U21B, and the other end is connected to the output terminal of the second operational amplifier U21B; one end of the fourth resistor R180 is connected to the non-inverting input terminal of the second operational amplifier U21B, the other end of the fourth resistor R180 is connected to one end of the fourth capacitor C109, and the other end of the fourth capacitor C109 is connected to the output terminal of the second operational amplifier U21B.

[0054] In one embodiment, Figure 2As shown, the second amplifying circuit 30 includes: a fifth resistor R183, a fifth capacitor C113, a sixth capacitor C112 and a third operational amplifier U10A; wherein, the non-inverting input terminal of the third operational amplifier U10A is connected to one end of the fifth resistor R183, the inverting input terminal of the third operational amplifier U10A is connected to one end of the fifth capacitor C113, and the output terminal of the third operational amplifier U10A is connected to the input terminal of the second comparison circuit 40; the other end of the fifth resistor R183 and the other end of the fifth capacitor C113 are both connected to the output terminal of the main control circuit; one end of the sixth capacitor C112 is connected to the non-inverting input terminal of the third operational amplifier U10A, and the other end is grounded.

[0055] In one embodiment, Figure 2 As shown, the second comparison circuit 40 includes: a fourth operational amplifier U10B; wherein, the inverting input terminal of the fourth operational amplifier U10B is connected to the output terminal of the third operational amplifier U10A, the non-inverting input terminal of the fourth operational amplifier U10B is connected to the actual RF voltage, and the output terminal of the fourth operational amplifier U10B is connected to the input terminal of the output circuit 50.

[0056] In one embodiment, Figure 2 As shown, the second comparison circuit 40 also includes: a sixth resistor R184 and a seventh resistor R86; wherein the sixth resistor R184 is connected between the in-phase input terminal of the fourth operational amplifier U10B and the output terminal of the third operational amplifier U10A; one end of the seventh resistor R86 is connected to the actual RF voltage, and the other end is connected to the in-phase input terminal of the fourth operational amplifier U10B.

[0057] In one embodiment, Figure 2 As shown, the second comparison circuit 40 also includes: a seventh capacitor C49, an eighth capacitor C46 and an eighth resistor R90; wherein, one end of the seventh capacitor C49 is connected to the in-phase input terminal of the fourth operational amplifier U10B, and the other end is connected to the output terminal of the fourth operational amplifier U10B; one end of the eighth resistor R90 is connected to the in-phase input terminal of the fourth operational amplifier U10B, the other end of the eighth resistor R90 is connected to one end of the eighth capacitor C46, ​​and the other end of the eighth capacitor C46 is connected to the output terminal of the fourth operational amplifier U10B.

[0058] In one embodiment, Figure 2As shown, the output circuit 50 includes: a multivibrator U15, a first diode D6, a second diode D8, a third diode D26, a transistor Q5, a ninth resistor R179, a tenth resistor R185, a ninth capacitor C111 and a fourth diode D17; wherein, the anode of the first diode D6 is connected to the output end of the first comparison circuit 20, and the cathode of the first diode D6 is connected to the base of the transistor Q5; the anode of the second diode D8 is connected to the output end of the second comparison circuit 40, and the cathode of the second diode D8 is connected to the base of the transistor Q5; the anode of the third diode D26 is connected to the main control circuit, and the cathode of the third diode D26 is connected to the base of the transistor Q5. The cathode is connected to the base of the transistor Q5; the collector of the transistor Q5 is connected to the second pin 2 of the multivibrator U15 and one end of the ninth resistor R179; the other end of the ninth resistor R179 is connected to the fourth pin 4 and the eighth pin 8 of the multivibrator U15; one end of the tenth resistor R185 is connected to the other end of the ninth resistor R179, the other end of the tenth resistor R185 is connected to one end of the ninth capacitor C111, and the other end of the ninth capacitor C111 is grounded; the anode of the fourth diode D17 is connected to the other end of the ninth resistor R179, and the cathode of the fourth diode D17 is connected to the fifth pin 5 of the multivibrator U15.

[0059] The present application receives the set RF current output by the main control circuit through the first amplifier circuit, and amplifies the set RF current and outputs it to the first comparison circuit; the first comparison circuit receives the set RF current and the actual RF current, and outputs the pending RF current to the output circuit; the second amplifier circuit receives the set RF voltage output by the main control circuit, and amplifies the set RF voltage and outputs it to the second comparison circuit; the second comparison circuit receives the set RF voltage and the actual RF voltage, and outputs the pending RF voltage to the output circuit; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board. The actual RF current and the set RF current are connected through the first comparison circuit, and the pending RF current is output; the set RF voltage and the actual RF voltage are connected through the second comparison circuit, and the pending RF voltage is output; the output circuit receives the pending RF current and the pending RF voltage, and outputs a level signal to the RF board; the present application can make corresponding adjustments according to the RF current corresponding to the actual output RF signal, so that the output RF electromagnetic wave can be adaptively changed according to the actual situation, ensuring the stimulation effect on the skin and improving the use efficiency.

[0060] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A signal conditioning circuit, characterized in that: include: a first amplifier circuit, whose input end is connected to the main control circuit, and whose output end is connected to the input end of the first comparison circuit, and is used to receive the set radio frequency current output by the main control circuit, and amplify the set radio frequency current and output it to the first comparison circuit; The first comparison circuit has an input end connected to the RF board and an output end connected to the input end of the output circuit, and is used to receive the set RF current after amplification, obtain the actual RF current of the RF board, and output the undetermined RF current to the output circuit; a second amplifier circuit, whose input end is connected to the main control circuit and whose output end is connected to the input end of the second comparison circuit, and is used to receive the set RF voltage output by the main control circuit, and amplify the set RF voltage and output it to the second comparison circuit; The second comparison circuit has an input end connected to the RF board and an output end connected to the input end of the output circuit, and is used to receive the set RF voltage after amplification, obtain the actual RF voltage of the RF board, and output the undetermined RF voltage to the output circuit; The output circuit, whose output end is connected to the radio frequency board, is used to receive the to-be-determined radio frequency current and the to-be-determined radio frequency voltage, and output a level signal to the radio frequency board.

2. The signal conditioning circuit according to claim 1, characterized in that: The first amplifying circuit comprises: a first resistor, a first capacitor, a second capacitor and a first operational amplifier; The non-inverting input terminal of the first operational amplifier is connected to one end of the first resistor, the inverting input terminal of the first operational amplifier is connected to one end of the first capacitor, and the output terminal of the first operational amplifier is connected to the input terminal of the first comparison circuit; The other end of the first resistor and the other end of the first capacitor are both connected to the output end of the main control circuit; One end of the second capacitor is connected to the non-inverting input terminal of the first operational amplifier, and the other end is grounded.

3. The signal conditioning circuit according to claim 2, characterized in that: The first comparison circuit comprises: a second operational amplifier; The inverting input terminal of the second operational amplifier is connected to the output terminal of the first operational amplifier, the non-inverting input terminal of the second operational amplifier is connected to the actual radio frequency current, and the output terminal of the second operational amplifier is connected to the input terminal of the output circuit.

4. The signal conditioning circuit according to claim 3, characterized in that: The first comparison circuit further includes: a second resistor and a third resistor; The second resistor is connected between the non-inverting input terminal of the second operational amplifier and the output terminal of the first operational amplifier; One end of the third resistor is connected to the actual radio frequency current, and the other end is connected to the non-inverting input terminal of the second operational amplifier.

5. The signal conditioning circuit according to claim 4, characterized in that: The first comparison circuit further includes: a third capacitor, a fourth capacitor and a fourth resistor; One end of the third capacitor is connected to the non-inverting input terminal of the second operational amplifier, and the other end is connected to the output terminal of the second operational amplifier; One end of the fourth resistor is connected to the non-inverting input terminal of the second operational amplifier, the other end of the fourth resistor is connected to one end of the fourth capacitor, and the other end of the fourth capacitor is connected to the output terminal of the second operational amplifier.

6. The signal conditioning circuit according to claim 1, characterized in that: The second amplifying circuit comprises: a fifth resistor, a fifth capacitor, a sixth capacitor and a third operational amplifier; The non-inverting input terminal of the third operational amplifier is connected to one end of the fifth resistor, the inverting input terminal of the third operational amplifier is connected to one end of the fifth capacitor, and the output terminal of the third operational amplifier is connected to the input terminal of the second comparison circuit; The other end of the fifth resistor and the other end of the fifth capacitor are both connected to the output end of the main control circuit; One end of the sixth capacitor is connected to the non-inverting input terminal of the third operational amplifier, and the other end is grounded.

7. The signal conditioning circuit according to claim 6, characterized in that: The second comparison circuit comprises: a fourth operational amplifier; The inverting input terminal of the fourth operational amplifier is connected to the output terminal of the third operational amplifier, the non-inverting input terminal of the fourth operational amplifier is connected to the actual radio frequency voltage, and the output terminal of the fourth operational amplifier is connected to the input terminal of the output circuit.

8. The signal conditioning circuit according to claim 7, characterized in that: The second comparison circuit further includes: a sixth resistor and a seventh resistor; The sixth resistor is connected between the non-inverting input terminal of the fourth operational amplifier and the output terminal of the third operational amplifier; One end of the seventh resistor is connected to the actual radio frequency voltage, and the other end is connected to the non-inverting input terminal of the fourth operational amplifier.

9. The signal conditioning circuit according to claim 8, characterized in that: The second comparison circuit further includes: a seventh capacitor, an eighth capacitor and an eighth resistor; One end of the seventh capacitor is connected to the non-inverting input terminal of the fourth operational amplifier, and the other end is connected to the output terminal of the fourth operational amplifier; One end of the eighth resistor is connected to the non-inverting input terminal of the fourth operational amplifier, the other end of the eighth resistor is connected to one end of the eighth capacitor, and the other end of the eighth capacitor is connected to the output terminal of the fourth operational amplifier.

10. The signal conditioning circuit according to claim 1, characterized in that: The output circuit comprises: a multivibrator, a first diode, a second diode, a third diode, a triode, a ninth resistor, a tenth resistor, a ninth capacitor and a fourth diode; The anode of the first diode is connected to the output end of the first comparison circuit, and the cathode of the first diode is connected to the base of the transistor; The anode of the second diode is connected to the output end of the second comparison circuit, and the cathode of the second diode is connected to the base of the transistor; The anode of the third diode is connected to the main control circuit, and the cathode of the third diode is connected to the base of the transistor; The collector of the triode is connected to the second pin of the multivibrator and one end of the ninth resistor; The other end of the ninth resistor is connected to the fourth pin and the eighth pin of the multivibrator; One end of the tenth resistor is connected to the other end of the ninth resistor, the other end of the tenth resistor is connected to one end of the ninth capacitor, and the other end of the ninth capacitor is grounded; The anode of the fourth diode is connected to the other end of the ninth resistor, and the cathode of the fourth diode is connected to the fifth pin of the multivibrator.

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