An AC-DC voltage converter

Abstract

The utility model discloses an AC-DC voltage converter, which relates to the field of voltage conversion. The AC-DC voltage converter comprises: an AC-DC module, which is used to convert AC power into DC power and output it to a DC regulation module; a DC regulation module, which is used to regulate the size of the output DC power; a voice prompt module, which is used to give a voice prompt before the overvoltage relief module works; and the overvoltage relief module is used to ground the current for current relief. The utility model has the following beneficial effects: the utility model is provided with a voice prompt module, which will give a voice prompt when the final output DC voltage is about to reach a threshold value during the voltage regulation process, and if the user further increases the output voltage through the DC regulation module, the overvoltage relief module will ground the voltage for current relief; a safety detection module is provided, which can check whether the overvoltage relief module is normal before the device works, so as to avoid load damage caused by adjusting the output voltage too high when the overvoltage relief module fails.

Description

Technical Field

[0001] The utility model relates to the field of voltage conversion, in particular to an AC-DC voltage converter. Background Art

[0002] AC-DC voltage conversion is the conversion of alternating current into direct current. During the conversion process, the produced direct current often needs to be regulated.

[0003] The existing voltage regulation circuit is often provided with a related protection circuit, which has the disadvantage that it cannot give a prompt when the voltage regulation is too large and can only be protected directly by the protection circuit, which needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide an AC-DC voltage converter to solve the problems raised in the above background technology.

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

[0006] An AC-DC voltage converter, comprising:

[0007] The AC-DC module is used to convert AC power into DC power and output it to the DC regulation module;

[0008] A DC regulation module is used to adjust the output DC power;

[0009] Voice prompt module, used for voice prompt before the overpressure relief module works;

[0010] An overvoltage discharge module is used for grounding discharge current when the output voltage of the DC regulation module exceeds a threshold;

[0011] Safety detection module, used to detect whether the overpressure relief module is working properly;

[0012] The AC-DC module is connected to the DC regulation module, the DC regulation module is connected to the voice prompt module, the overvoltage relief module, and the safety detection module, and the safety detection module is connected to the overvoltage relief module.

[0013] As a further solution of the utility model: the DC regulation module includes a resistor R1, a resistor R2, a potentiometer RP1, a transistor V1, and a voltmeter V. One end of the resistor R1 is connected to the AC-DC conversion module, the other end of the resistor R1 is connected to one end of the resistor R2 and the collector of the transistor V1, the other end of the resistor R2 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is grounded, the sliding end of the potentiometer RP1 is connected to the base of the transistor V1, the emitter of the transistor V1 is connected to one end of the voltmeter V, the voice prompt module, the overvoltage discharge module, and the safety detection module, and the other end of the voltmeter V is grounded.

[0014] As a further solution of the utility model: the voice prompt module includes a diode D1, a resistor R3, a MOS tube V2, a voice chip MIC, and a resistor R4. The cathode of the diode D1 is connected to the D pole of the MOS tube V2 and the DC regulation module, the anode of the diode D1 is connected to one end of the resistor R3 and the G pole of the MOS tube V2, the other end of the resistor R3 is grounded, the S pole of the MOS tube V2 is connected to one end of the voice chip MIC, the other end of the voice chip MIC is connected to one end of the resistor R4, and the other end of the resistor R4 is grounded.

[0015] As a further solution of the utility model: the overvoltage discharge module includes a diode D2, a diode D3, a resistor R6, a MOS tube V3, and a switch S1. The cathode of the diode D2 is connected to the second end of the switch S1 and the DC regulation module. The anode of the diode D2 is connected to the anode of the diode D3, the G pole of the MOS tube V3, and the safety detection module. The cathode of the diode D3 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the S pole of the MOS tube V3 is grounded, and the D pole of the MOS tube V3 is connected to the first end of the switch S1.

[0016] As a further solution of the utility model: the safety detection module includes a resistor R5, a switch S2, and a diode D4, one end of the resistor R5 is connected to the positive electrode of the diode D4 and the DC regulation module, one end of the resistor R5 is connected to the third end of the switch S2, the second end of the switch S2 is suspended, the first end of the switch S2 is connected to the G pole of the MOS tube V3, and the negative pole of the diode D4 is connected to the third end of the switch S1.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model is provided with a voice prompt module, and during the voltage regulation process, a voice prompt will be given when the final output DC voltage is about to reach the threshold value; if the user further increases the output voltage through the DC regulation module, the overvoltage relief module will be grounded to relieve the pressure; a safety detection module is provided to check whether the overvoltage relief module is normal before the equipment works, so as to avoid load damage caused by adjusting the output voltage too high when the overvoltage relief module fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an AC-DC voltage converter.

[0019] Figure 2 This is the circuit diagram of the AC to DC module.

[0020] Figure 3 It is a circuit diagram of a DC regulation module, a voice prompt module, an overvoltage relief module and a safety detection module. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 , an AC-DC voltage converter, comprising:

[0023] The AC-DC module is used to convert AC power into DC power and output it to the DC regulation module;

[0024] A DC regulation module is used to adjust the output DC power;

[0025] Voice prompt module, used for voice prompt before the overpressure relief module works;

[0026] An overvoltage discharge module is used for grounding discharge current when the output voltage of the DC regulation module exceeds a threshold;

[0027] Safety detection module, used to detect whether the overpressure relief module is working properly;

[0028] The AC-DC module is connected to the DC regulation module, the DC regulation module is connected to the voice prompt module, the overvoltage relief module, and the safety detection module, and the safety detection module is connected to the overvoltage relief module.

[0029] In the specific embodiment: see Figure 2 The AC power is stepped down by transformer W, and then converted to DC by rectifier T. Finally, it is filtered by the filter circuit composed of capacitor C1, capacitor C2 and inductor L1.

[0030] In this example: See Figure 3 The DC regulation module includes a resistor R1, a resistor R2, a potentiometer RP1, a transistor V1, and a voltmeter V. One end of the resistor R1 is connected to the AC-DC conversion module, the other end of the resistor R1 is connected to one end of the resistor R2 and the collector of the transistor V1, the other end of the resistor R2 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is grounded, the sliding end of the potentiometer RP1 is connected to the base of the transistor V1, the emitter of the transistor V1 is connected to one end of the voltmeter V, the voice prompt module, the overvoltage discharge module, and the safety detection module, and the other end of the voltmeter V is grounded.

[0031] After the voltage is input, the voltage at the lower half of the sliding end of the potentiometer RP1 is the base voltage of the transistor V1. By adjusting the resistance value of the potentiometer RP1, the base voltage of the transistor V1 is changed, and the conduction degree of the transistor V1 is changed to adjust the output voltage. The output voltage can be observed in real time through the voltmeter V.

[0032] In this example: See Figure 3 The voice prompt module includes a diode D1, a resistor R3, a MOS tube V2, a voice chip MIC, and a resistor R4. The cathode of the diode D1 is connected to the D pole of the MOS tube V2 and the DC regulation module. The anode of the diode D1 is connected to one end of the resistor R3 and the G pole of the MOS tube V2. The other end of the resistor R3 is grounded. The S pole of the MOS tube V2 is connected to one end of the voice chip MIC. The other end of the voice chip MIC is connected to one end of the resistor R4. The other end of the resistor R4 is grounded.

[0033] Based on adjusting the output voltage through the potentiometer RP1, the output voltage is adjusted continuously, that is, if it is adjusted from small to large, the voltage will gradually increase. When the voltage reaches the first threshold, the voltage regulator diode D1 is turned on, triggering the MOS tube V2 to normal, and the voice chip MIC is powered on and works. The voice prompt voltage is too large, and the voltage continues to increase and the current will be discharged to the ground.

[0034] In this example: See Figure 3 The overvoltage discharge module includes a diode D2, a diode D3, a resistor R6, a MOS tube V3, and a switch S1. The cathode of the diode D2 is connected to the second end of the switch S1 and the DC regulation module. The anode of the diode D2 is connected to the anode of the diode D3, the G pole of the MOS tube V3, and the safety detection module. The cathode of the diode D3 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the S pole of the MOS tube V3 is grounded, and the D pole of the MOS tube V3 is connected to the first end of the switch S1.

[0035] The output voltage further increases, so that the voltage reaches the second threshold, the voltage regulator diode D2 is turned on, triggering the MOS tube V3 to turn on, the voltage is discharged through the switch S1 and the MOS tube V3 to the ground, and the light-emitting diode D3 is set to light up to indicate the pressure relief state.

[0036] In this example: See Figure 3 The safety detection module includes a resistor R5, a switch S2, and a diode D4. One end of the resistor R5 is connected to the positive electrode of the diode D4 and the DC regulation module. One end of the resistor R5 is connected to the third end of the switch S2. The second end of the switch S2 is suspended. The first end of the switch S2 is connected to the G pole of the MOS tube V3. The cathode of the diode D4 is connected to the third end of the switch S1.

[0037] Before adjustment, the safety detection module can be used to determine whether the overvoltage relief module is faulty to avoid failure to provide safety protection; initially, the first and second ends of the switch S1 are connected, and the first and second ends of the switch S2 are connected. The switch S1 is changed to be connected to the first and third ends, and the switch S2 is also changed to be connected to the first and third ends. At this time, the resistor R5 provides a conduction signal to the G pole of the MOS tube V3, and the MOS tube V3 is turned on. The voltage passes through the diode D4, the switch S1, and the MOS tube V3 to be grounded. At this time, the light-emitting diode D4 lights up to show that the overvoltage relief module is normal. If the light-emitting diode D4 does not light up, that is, the overvoltage relief module is abnormal, it is necessary to pay attention to adjusting the output voltage.

[0038] The working principle of the utility model is as follows: the AC to DC module is used to convert AC power into DC power and output it to the DC regulation module; the DC regulation module is used to adjust the size of the output DC power; the voice prompt module is used to give a voice prompt before the overvoltage relief module works; the overvoltage relief module is used to ground and discharge current when the output voltage of the DC regulation module exceeds a threshold; and the safety detection module is used to detect whether the overvoltage relief module works normally.

[0039] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An AC-DC voltage converter, characterized in that: The AC-DC voltage converter comprises: The AC-DC module is used to convert AC power into DC power and output it to the DC regulation module; A DC regulation module is used to adjust the output DC power; Voice prompt module, used for voice prompt before the overpressure relief module works; An overvoltage discharge module is used for grounding discharge current when the output voltage of the DC regulation module exceeds a threshold; Safety detection module, used to detect whether the overpressure relief module is working properly; The AC-DC module is connected to the DC regulation module, the DC regulation module is connected to the voice prompt module, the overvoltage relief module, and the safety detection module, and the safety detection module is connected to the overvoltage relief module.

2. The AC-DC voltage converter according to claim 1, characterized in that: The DC regulation module includes a resistor R1, a resistor R2, a potentiometer RP1, a transistor V1, and a voltmeter V. One end of the resistor R1 is connected to the AC-DC conversion module, the other end of the resistor R1 is connected to one end of the resistor R2 and the collector of the transistor V1, the other end of the resistor R2 is connected to one end of the potentiometer RP1, the other end of the potentiometer RP1 is grounded, the sliding end of the potentiometer RP1 is connected to the base of the transistor V1, the emitter of the transistor V1 is connected to one end of the voltmeter V, the voice prompt module, the overvoltage discharge module, and the safety detection module, and the other end of the voltmeter V is grounded.

3. The AC-DC voltage converter according to claim 1, characterized in that: The voice prompt module includes a diode D1, a resistor R3, a MOS tube V2, a voice chip MIC, and a resistor R4. The cathode of the diode D1 is connected to the D pole of the MOS tube V2 and the DC regulation module, the anode of the diode D1 is connected to one end of the resistor R3 and the G pole of the MOS tube V2, the other end of the resistor R3 is grounded, the S pole of the MOS tube V2 is connected to one end of the voice chip MIC, the other end of the voice chip MIC is connected to one end of the resistor R4, and the other end of the resistor R4 is grounded.

4. The AC-DC voltage converter according to claim 1, characterized in that: The overvoltage discharge module includes a diode D2, a diode D3, a resistor R6, a MOS tube V3, and a switch S1. The cathode of the diode D2 is connected to the second end of the switch S1 and the DC regulation module. The anode of the diode D2 is connected to the anode of the diode D3, the G pole of the MOS tube V3, and the safety detection module. The cathode of the diode D3 is connected to one end of the resistor R6, the other end of the resistor R6 is grounded, the S pole of the MOS tube V3 is grounded, and the D pole of the MOS tube V3 is connected to the first end of the switch S1.

5. The AC-DC voltage converter according to claim 4, characterized in that: The safety detection module includes a resistor R5, a switch S2, and a diode D4. One end of the resistor R5 is connected to the positive electrode of the diode D4 and the DC regulation module. One end of the resistor R5 is connected to the third end of the switch S2. The second end of the switch S2 is suspended. The first end of the switch S2 is connected to the G pole of the MOS tube V3. The cathode of the diode D4 is connected to the third end of the switch S1.

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