Voltage-reducing and voltage-stabilizing circuit with control type ventilation detection

Abstract

The utility model firstly discloses a voltage-reducing and voltage-stabilizing circuit with a control type ventilation detection function. The voltage-reducing and voltage-stabilizing circuit comprises an AC-DC conversion module, an adjustable voltage-reducing and voltage-stabilizing module, a current limiting module, a control type switch module, a detection input module, a monitoring module and a charging and discharging module, the input end of the AC-DC conversion module is connected to commercial power AC 220v voltage, the output end of the AC-DC conversion module is connected to the input end of the adjustable voltage reduction and stabilization module, the output end of the adjustable voltage reduction and stabilization module is connected to the input end of the current limiting module, and the input end of the current limiting module is connected to the positive electrode end of the charging and discharging module. The cathode end of the charging and discharging module is grounded; the first-side high-voltage input end of the detection input module is connected to the output end of the AC-DC conversion module, and the first-side low-voltage input end and the second-side low-voltage input end of the detection input module are grounded. The voltage-reducing and voltage-stabilizing circuit with the control type ventilation detection solves the problem that the output of the AC-DC conversion module cannot be detected in the prior art.

Description

Technical Field

[0001] The utility model relates to a step-down and voltage-stabilizing circuit, in particular to a step-down and voltage-stabilizing circuit with controlled ventilation detection. Background Art

[0002] In the prior art, the buck-voltage stabilizing circuit includes: an AC-DC conversion module, a buck-voltage stabilizing module and a charging module. The input end of the AC-DC conversion module is connected to the AC 220V mains voltage, the output end of the AC-DC conversion module is connected to the input end of the buck-voltage stabilizing module, the output end of the buck-voltage stabilizing module is connected to the positive pole of the charging module, the negative pole of the charging module is grounded, and the output end of the buck-voltage stabilizing module is the output end of the entire buck-voltage stabilizing circuit.

[0003] Although the above-mentioned step-down voltage stabilization circuit can convert the AC 220V mains voltage into a DC 24V voltage, the step-down voltage stabilization circuit has the disadvantage that it cannot detect the output of the AC-DC conversion module, resulting in an inability to determine whether the mains power has been properly connected. Summary of the Invention

[0004] The utility model aims to provide a voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection, which solves the problem in the prior art that the output of an AC-DC conversion module cannot be detected.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model first discloses a voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection, comprising: an AC / DC conversion module, an adjustable voltage-step-down and voltage-stabilizing module, a current-limiting module, a controlled switch module, a detection input module, a monitoring module, and a charging and discharging module; the input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable voltage-step-down and voltage-stabilizing module, the output end of the adjustable voltage-step-down and voltage-stabilizing module is connected to the input end of the current-limiting module, the input end of the current-limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; the high-voltage input end of the first side of the detection input module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; The end is connected to the output end of the AC-DC conversion module, the first side low-voltage input end and the second side low-voltage input end of the detection input module are grounded, and the second side high-voltage input end of the detection input module is connected to the positive end of the charging and discharging module; the second side output end of the detection input module is connected to the input end of the monitoring module; the output end of the current limiting module is connected to the high voltage end of the controlled switch module, the low voltage end of the controlled switch module is grounded, the output end of the monitoring module is connected to the control end of the controlled switch module, and the monitoring module is communicatively connected to the external wind speed detection controller; the positive end of the charging and discharging module is the output end of the step-down and voltage stabilizing circuit with controlled ventilation detection.

[0007] Preferably, the controlled switch module includes: a switching transistor Q1, a resistor R5 and a resistor R6, the collector of the switching transistor Q1 is the high voltage end of the controlled switch module, the emitter of the switching transistor Q1 is grounded through the resistor R5, the end of the resistor R5 facing away from the emitter of the switching transistor Q1 is the low voltage end of the controlled switch module, the emitter of the switching transistor Q1 is connected to the base of the switching transistor Q1 through the resistor R6, and the base of the switching transistor Q1 is the control end of the controlled switch module.

[0008] Preferably, the AC-DC conversion module includes: a fuse FU1, a voltage-stabilizing diode D1, a capacitor C1, a capacitor C2 and a rectifier bridge BR1, the first input end of the rectifier bridge BR1 is connected to one end of the fuse FU1, the other end of the fuse FU1 is the first input end L of the AC-DC conversion module, the second input end of the rectifier bridge BR1 is the second input end N of the AC-DC conversion module, the first input end of the rectifier bridge BR1 is connected to the anode of the voltage-stabilizing diode D1 and the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is connected to the positive electrode of the capacitor C2, the negative electrode of the capacitor C2 and the cathode of the voltage-stabilizing diode D1 are both connected to the second input end of the rectifier bridge BR1, the first output end of the rectifier bridge BR1 is the output end of the AC-DC conversion module, and the second output end of the rectifier bridge BR1 is grounded.

[0009] Preferably, the adjustable step-down voltage regulator module includes: a sliding resistor RV1, a capacitor C3, a capacitor C4, a step-down voltage regulator chip U2 and a resistor R4, the input end of the step-down voltage regulator chip U2 is connected to the positive electrode of the capacitor C3, the negative electrode of the capacitor C3, the negative electrode of the capacitor C4 and the second fixed end of the sliding resistor RV1 are all grounded, the first fixed end of the sliding resistor RV1 is connected to the ADJ end of the step-down voltage regulator chip U2, the sliding end of the sliding resistor RV1 is connected to one end of the resistor R4, the other end of the resistor R4 and the positive electrode of the capacitor C4 are all connected to the output end of the step-down voltage regulator chip U2, the output end of the step-down voltage regulator chip U2 is the output end of the adjustable step-down voltage regulator module, and the input end of the step-down voltage regulator chip U2 is the input end of the adjustable step-down voltage regulator module.

[0010] Preferably, the detection input module includes: a photoelectric coupler U1, a resistor R1, a resistor R2 and a resistor R3, the anode of the photoelectric coupler U1 transmitting tube is the high-voltage input end of the first side of the detection input module, the cathode of the photoelectric coupler U1 transmitting tube is connected to the first end of the resistor R1, the second end of the resistor R1 is the low-voltage input end of the first side of the detection input module, the first end of the photoelectric coupler U1 receiving tube is the high-voltage input end of the second side of the detection input module, the second end of the photoelectric coupler U1 receiving tube is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the second end of the resistor R3 is the low-voltage input end of the second side of the detection input module, and the second end of the resistor R2 is the output end of the second side of the detection input module.

[0011] The utility model also discloses a voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection, comprising: an AC / DC conversion module, an adjustable voltage-step-down and voltage-stabilizing module, a current-limiting module, a controlled switch module, a detection input module, a monitoring module, and a charging and discharging module; the input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable voltage-step-down and voltage-stabilizing module, the output end of the adjustable voltage-step-down and voltage-stabilizing module is connected to the input end of the current-limiting module, the input end of the current-limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; the high-voltage input end of the first side of the detection input module is connected to the output end of the AC / DC conversion module, the detection input module is connected to the monitoring module, and the monitoring module is connected to the charging and discharging module. The first side low-voltage input terminal and the second side low-voltage input terminal of the input module are grounded, and the second side high-voltage input terminal of the detection input module is connected to the positive terminal of the charging and discharging module; the second side output terminal of the detection input module is connected to the input terminal of the monitoring module; the output terminal of the current limiting module is connected to the switch fixed terminal of the controlled switch module and the control high-voltage terminal of the controlled switch module, the switch normally closed terminal of the controlled switch module is vacant, the control low-voltage terminal of the controlled switch module is grounded, the output terminal of the monitoring module is connected to the control terminal of the controlled switch module, and the monitoring module is communicatively connected to the external wind speed detection controller; the switch normally open terminal of the controlled switch module is the output terminal of the voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection.

[0012] Preferably, the controlled switch module includes: a relay RL1, a switching transistor Q2, a resistor R7 and a resistor R8, a single-pole double-throw switch is provided in the relay RL1, the fixed end of the single-pole double-throw switch is the fixed end of the controlled switch module, the first movable end of the single-pole double-throw switch is the normally closed end of the controlled switch module, and the second movable end of the single-pole double-throw switch is the normally open end of the controlled switch module. The high-voltage end of the coil in the relay RL1 is the controlled high-voltage end of the controlled switch module, the low-voltage end of the coil in the relay RL1 is connected to the collector of the switching transistor Q2, the emitter of the switching transistor Q2 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded, the second end of the resistor R8 is the controlled low-voltage end of the controlled switch module, the first end of the resistor R8 is connected to the base of the switching transistor Q2 through the resistor R7, and the base of the switching transistor Q2 is the control end of the controlled switch module.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this application, a detection input module is set up to realize the voltage output by the AC-DC conversion module. Since the AC-DC conversion module may output high voltage, a photoelectric coupler is set in the detection input module. In the photoelectric coupler, the first side is a transmitting tube, which can be connected to a high voltage and will not be damaged after being connected to a high voltage. The receiving tube on the second side senses the light emitted by the transmitting tube, which is equivalent to a closed switch. In this way, the second side can maintain a stable low voltage output and will not cause damage to the monitoring module due to the access to a high voltage. It not only realizes the detection of whether the AC-DC conversion module has a voltage output, but also protects the monitoring module and extends the service life of the monitoring module. By detecting whether the AC-DC conversion module has a voltage output, it can be determined whether the mains power is normally connected. At the same time, the monitoring module also controls whether the voltage is output through the control switch module, which is convenient for controlling the power supply.

[0015] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a circuit diagram of the voltage-stepping and stabilizing circuit with controlled ventilation detection in Example 1.

[0017] Figure 2 This is a circuit diagram of the voltage-stepping and stabilizing circuit with controlled ventilation detection in Example 2. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further explained below with reference to the accompanying drawings and specific implementation methods.

[0019] Example 1:

[0020] like Figure 1As shown, this embodiment discloses a voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection, comprising: an AC / DC conversion module, an adjustable voltage-step-down and voltage-stabilizing module, a current-limiting module, a controlled switch module, a detection input module, a monitoring module, and a charging and discharging module; the input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable voltage-step-down and voltage-stabilizing module, the output end of the adjustable voltage-step-down and voltage-stabilizing module is connected to the input end of the current-limiting module, the input end of the current-limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; the high-voltage input end of the first side of the detection input module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; The end is connected to the output end of the AC-DC conversion module, the first side low-voltage input end and the second side low-voltage input end of the detection input module are grounded, and the second side high-voltage input end of the detection input module is connected to the positive end of the charging and discharging module; the second side output end of the detection input module is connected to the input end of the monitoring module; the output end of the current limiting module is connected to the high voltage end of the controlled switch module, the low voltage end of the controlled switch module is grounded, the output end of the monitoring module is connected to the control end of the controlled switch module, and the monitoring module is communicatively connected to the external wind speed detection controller; the positive end of the charging and discharging module is the output end of the step-down and voltage stabilizing circuit with controlled ventilation detection.

[0021] The current limiting module is a diode D2, the anode of the diode D2 is the input end of the current limiting module, and the cathode of the diode D2 is the output end of the current limiting module.

[0022] The charging and discharging module is capacitor C5, with the positive terminal of capacitor C5 being the positive terminal of the charging and discharging module and the negative terminal of capacitor C5 being the negative terminal of the charging and discharging module. When there is no mains power, the charging and discharging module discharges, and diode D2 prevents voltage backflow from affecting chips that require positive voltage supply.

[0023] The controlled switch module includes a switching transistor Q1, resistors R5, and R6. The collector of switching transistor Q1 serves as the high-voltage terminal of the controlled switch module. The emitter of switching transistor Q1 is connected to ground via resistor R5. The end of resistor R5 facing away from the emitter of switching transistor Q1 serves as the low-voltage terminal of the controlled switch module. The emitter of switching transistor Q1 is connected to the base of switching transistor Q1 via resistor R6. The base of switching transistor Q1 serves as the control terminal of the controlled switch module. Resistor R6 provides voltage regulation. When the base of switching transistor Q1 is high, it is connected, equivalent to connecting the current limiting module to a low voltage. Only then does a voltage output occur.

[0024] The AC / DC conversion module includes: fuse FU1, voltage-stabilizing diode D1, capacitor C1, capacitor C2, and rectifier bridge BR1. The first input terminal of rectifier bridge BR1 is connected to one end of fuse FU1, and the other end of fuse FU1 is the first input terminal L of the AC / DC conversion module. The second input terminal of rectifier bridge BR1 is the second input terminal N of the AC / DC conversion module. The first input terminal of rectifier bridge BR1 is connected to the anode of voltage-stabilizing diode D1 and the positive terminal of capacitor C1. The negative terminal of capacitor C1 is connected to the positive terminal of capacitor C2. The negative terminal of capacitor C2 and the cathode of voltage-stabilizing diode D1 are both connected to the second input terminal of rectifier bridge BR1. The first output terminal of rectifier bridge BR1 is the output terminal of the AC / DC conversion module, and the second output terminal of rectifier bridge BR1 is grounded. Rectifier bridge BR1 is used to convert AC to DC. Voltage-stabilizing diode D1, capacitor C1, and capacitor C2 provide voltage stabilization.

[0025] The adjustable step-down voltage regulator module includes: a sliding resistor RV1, a capacitor C3, a capacitor C4, a step-down voltage regulator chip U2 and a resistor R4. The input end of the step-down voltage regulator chip U2 is connected to the positive electrode of the capacitor C3, the negative electrode of the capacitor C3, the negative electrode of the capacitor C4 and the second fixed end of the sliding resistor RV1 are all grounded, the first fixed end of the sliding resistor RV1 is connected to the ADJ end of the step-down voltage regulator chip U2, the sliding end of the sliding resistor RV1 is connected to one end of the resistor R4, the other end of the resistor R4 and the positive electrode of the capacitor C4 are all connected to the output end of the step-down voltage regulator chip U2, the output end of the step-down voltage regulator chip U2 is the output end of the adjustable step-down voltage regulator module, and the input end of the step-down voltage regulator chip U2 is the input end of the adjustable step-down voltage regulator module. By adjusting the access resistance value of the sliding resistor RV1, the voltage output can be adjusted so that the voltage output is 24V. The output voltage of the AC-DC conversion module is about 48V.

[0026] The detection input module includes: a photocoupler U1, a resistor R1, a resistor R2, and a resistor R3. The anode of the photocoupler U1 transmitter is the first side high-voltage input terminal of the detection input module, the cathode of the photocoupler U1 transmitter is connected to the first end of resistor R1, and the second end of resistor R1 is the first side low-voltage input terminal of the detection input module. The first end of the photocoupler U1 receiver is the second side high-voltage input terminal of the detection input module, the second end of the photocoupler U1 receiver is connected to the first end of resistor R2, the second end of resistor R2 is connected to the first end of resistor R3, the second end of resistor R3 is grounded, the second end of resistor R3 is the second side low-voltage input terminal of the detection input module, and the second end of resistor R2 is the second side output terminal of the detection input module. Resistors R2 and R3 act as voltage dividers, outputting the voltage after voltage reduction. Example

[0027] like Figure 2As shown, the utility model also discloses a voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection, comprising: an AC / DC conversion module, an adjustable voltage-step-down and voltage-stabilizing module, a current-limiting module, a controlled switch module, a detection input module, a monitoring module, and a charging and discharging module; the input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable voltage-step-down and voltage-stabilizing module, the output end of the adjustable voltage-step-down and voltage-stabilizing module is connected to the input end of the current-limiting module, the input end of the current-limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; the high-voltage input end of the first side of the detection input module is connected to the output end of the AC / DC conversion module, The first side low-voltage input terminal and the second side low-voltage input terminal of the detection input module are grounded, and the second side high-voltage input terminal of the detection input module is connected to the positive terminal of the charging and discharging module; the second side output terminal of the detection input module is connected to the input terminal of the monitoring module; the output terminal of the current limiting module is connected to the switch fixed terminal of the controlled switch module and the control high-voltage terminal of the controlled switch module, the switch normally closed terminal of the controlled switch module is vacant, the control low-voltage terminal of the controlled switch module is grounded, the output terminal of the monitoring module is connected to the control terminal of the controlled switch module, and the monitoring module is communicatively connected to the external wind speed detection controller; the switch normally open terminal of the controlled switch module is the output terminal of the voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection.

[0028] The only difference between this embodiment and embodiment 1 is the connection method and specific circuit of the controlled switch module. The other structures in the two embodiments are the same. In embodiment 1, when the charging and discharging module is discharging, the controlled switch module does not block the discharge output of the charging and discharging module. However, this embodiment uses relay RL1 and switching transistor Q2 to control the discharge. Relay RL1 directly controls whether the output end of the entire controlled ventilation detection buck stabilization circuit is connected to the positive terminal of the charging and discharging module, thereby controlling whether the charging and discharging module is connected to the output when the charging and discharging module is discharging.

[0029] The controlled switch module includes: a relay RL1, a switching transistor Q2, a resistor R7 and a resistor R8. A single-pole double-throw switch is provided in the relay RL1. The fixed end of the single-pole double-throw switch is the fixed end of the controlled switch module. The first movable end of the single-pole double-throw switch is the normally closed end of the controlled switch module. The second movable end of the single-pole double-throw switch is the normally open end of the controlled switch module. The high-voltage end of the coil in the relay RL1 is the controlled high-voltage end of the controlled switch module. The low-voltage end of the coil in the relay RL1 is connected to the collector of the switching transistor Q2. The emitter of the switching transistor Q2 is connected to the first end of the resistor R8. The second end of the resistor R8 is grounded. The second end of the resistor R8 is the controlled low-voltage end of the controlled switch module. The first end of the resistor R8 is connected to the base of the switching transistor Q2 through the resistor R7. The base of the switching transistor Q2 is the control end of the controlled switch module.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A step-down voltage stabilizing circuit with controlled ventilation detection, characterized in that: include: AC-DC conversion module, adjustable step-down voltage regulator module, current limiting module, controlled switch module, detection input module, monitoring module and charging and discharging module; The input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable buck regulator module, the output end of the adjustable buck regulator module is connected to the input end of the current limiting module, the input end of the current limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; The high-voltage input terminal on the first side of the detection input module is connected to the output terminal of the AC-DC conversion module, the low-voltage input terminal on the first side and the low-voltage input terminal on the second side of the detection input module are grounded, and the high-voltage input terminal on the second side of the detection input module is connected to the positive terminal of the charging and discharging module; the output terminal on the second side of the detection input module is connected to the input terminal of the monitoring module; The output end of the current limiting module is connected to the high voltage end of the control switch module, the low voltage end of the control switch module is grounded, the output end of the monitoring module is connected to the control end of the control switch module, and the monitoring module is connected to the external wind speed detection controller; The positive terminal of the charging and discharging module is the output terminal of the controlled ventilation detection buck voltage stabilization circuit.

2. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection according to claim 1, characterized in that: The controlled switch module includes: a switching transistor Q1, a resistor R5 and a resistor R6. The collector of the switching transistor Q1 is the high voltage end of the controlled switch module, the emitter of the switching transistor Q1 is grounded through the resistor R5, and the end of the resistor R5 facing away from the emitter of the switching transistor Q1 is the low voltage end of the controlled switch module. The emitter of the switching transistor Q1 is connected to the base of the switching transistor Q1 through the resistor R6, and the base of the switching transistor Q1 is the control end of the controlled switch module.

3. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection according to claim 1, characterized in that: The AC-DC conversion module includes: a fuse FU1, a voltage-stabilizing diode D1, a capacitor C1, a capacitor C2 and a rectifier bridge BR1. The first input end of the rectifier bridge BR1 is connected to one end of the fuse FU1, and the other end of the fuse FU1 is the first input end L of the AC-DC conversion module. The second input end of the rectifier bridge BR1 is the second input end N of the AC-DC conversion module. The first input end of the rectifier bridge BR1 is connected to the anode of the voltage-stabilizing diode D1 and the positive electrode of the capacitor C1, the negative electrode of the capacitor C1 is connected to the positive electrode of the capacitor C2, the negative electrode of the capacitor C2 and the cathode of the voltage-stabilizing diode D1 are both connected to the second input end of the rectifier bridge BR1, the first output end of the rectifier bridge BR1 is the output end of the AC-DC conversion module, and the second output end of the rectifier bridge BR1 is grounded.

4. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection according to claim 1, characterized in that: The adjustable step-down voltage regulator module includes: a sliding resistor RV1, a capacitor C3, a capacitor C4, a step-down voltage regulator chip U2 and a resistor R4. The input end of the step-down voltage regulator chip U2 is connected to the positive electrode of the capacitor C3, the negative electrode of the capacitor C3, the negative electrode of the capacitor C4 and the second fixed end of the sliding resistor RV1 are all grounded, the first fixed end of the sliding resistor RV1 is connected to the ADJ end of the step-down voltage regulator chip U2, the sliding end of the sliding resistor RV1 is connected to one end of the resistor R4, the other end of the resistor R4 and the positive electrode of the capacitor C4 are all connected to the output end of the step-down voltage regulator chip U2, the output end of the step-down voltage regulator chip U2 is the output end of the adjustable step-down voltage regulator module, and the input end of the step-down voltage regulator chip U2 is the input end of the adjustable step-down voltage regulator module.

5. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection according to claim 1, characterized in that: The detection input module includes: a photoelectric coupler U1, a resistor R1, a resistor R2 and a resistor R3. The anode of the photoelectric coupler U1 transmitting tube is the high-voltage input end of the first side of the detection input module, the cathode of the photoelectric coupler U1 transmitting tube is connected to the first end of the resistor R1, the second end of the resistor R1 is the low-voltage input end of the first side of the detection input module, the first end of the photoelectric coupler U1 receiving tube is the high-voltage input end of the second side of the detection input module, the second end of the photoelectric coupler U1 receiving tube is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the second end of the resistor R3 is the low-voltage input end of the second side of the detection input module, and the second end of the resistor R2 is the output end of the second side of the detection input module.

6. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection is characterized in that: include: AC-DC conversion module, adjustable step-down voltage regulator module, current limiting module, controlled switch module, detection input module, monitoring module and charging and discharging module; The input end of the AC / DC conversion module is connected to the AC 220V mains voltage, the output end of the AC / DC conversion module is connected to the input end of the adjustable buck regulator module, the output end of the adjustable buck regulator module is connected to the input end of the current limiting module, the input end of the current limiting module is connected to the positive end of the charging and discharging module, and the negative end of the charging and discharging module is grounded; The high-voltage input terminal on the first side of the detection input module is connected to the output terminal of the AC-DC conversion module, the low-voltage input terminal on the first side and the low-voltage input terminal on the second side of the detection input module are grounded, and the high-voltage input terminal on the second side of the detection input module is connected to the positive terminal of the charging and discharging module; the output terminal on the second side of the detection input module is connected to the input terminal of the monitoring module; The output end of the current limiting module is connected to the fixed switch end of the controlled switch module and the high-voltage control end of the controlled switch module, the normally closed switch end of the controlled switch module is vacant, the low-voltage control end of the controlled switch module is grounded, the output end of the monitoring module is connected to the control end of the controlled switch module, and the monitoring module is connected to the external wind speed detection controller; The normally open end of the switch of the controlled switch module is the output end of the controlled ventilation detection step-down and voltage stabilizing circuit.

7. The voltage-step-down and voltage-stabilizing circuit with controlled ventilation detection according to claim 6, characterized in that: The controlled switch module includes: a relay RL1, a switching transistor Q2, a resistor R7 and a resistor R8. A single-pole double-throw switch is provided in the relay RL1. The fixed end of the single-pole double-throw switch is the fixed end of the controlled switch module. The first movable end of the single-pole double-throw switch is the normally closed end of the controlled switch module. The second movable end of the single-pole double-throw switch is the normally open end of the controlled switch module. The high-voltage end of the coil in the relay RL1 is the controlled high-voltage end of the controlled switch module. The low-voltage end of the coil in the relay RL1 is connected to the collector of the switching transistor Q2. The emitter of the switching transistor Q2 is connected to the first end of the resistor R8. The second end of the resistor R8 is grounded. The second end of the resistor R8 is the controlled low-voltage end of the controlled switch module. The first end of the resistor R8 is connected to the base of the switching transistor Q2 through the resistor R7. The base of the switching transistor Q2 is the control end of the controlled switch module.

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