Alternating current to direct current large-current power supply circuit

Abstract

The utility model, which relates to the power supply field, discloses an AC-to-DC large-current power supply circuit comprising a capacitor voltage reduction module which is used for reducing the voltage of a 220V alternating current through a capacitor and then outputting the voltage to a rectification filtering module; the rectifying and filtering module is used for converting the alternating current after voltage reduction into direct current and outputting the direct current to the high-frequency switch module; the high-frequency switch module is used for isolating and outputting the direct current to the rectification output module after passing through a high-frequency switch; the rectification output module is used for outputting a DC power supply with the maximum of 135mA; the capacitor voltage reduction module is connected with the rectification filtering module, and the rectification filtering module is connected with the high-frequency switch module, compared with the prior art, the beneficial effects of the utility model are that in the capacitor voltage reduction module, a small-size voltage reduction capacitor is utilized, and in the high-frequency switch module, DC-DC secondary voltage transformation is realized through high-frequency oscillation, so that larger current output is obtained; the direct-current power supply mode is small in size, low in cost and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply field, concretely is a kind of AC-DC large current power supply circuit. BACKGROUND

[0002] Traditional DC power supply mode mainly has two kinds, one is transformer plus rectification after capacitor filtering after carrying out DC power supply, due to the volume of transformer, rectifier and filter capacitor element is relatively large, leading to the volume of entire power supply system is also relatively large;Another is to utilize switching power supply to carry out DC power supply, due to the adoption of advanced switching power supply control chip and high-frequency transformer element, manufacturing cost is relatively high;Summarized above, the existing DC power supply mode is either bulky, or cost is high, practicality is general, needs improvement. SUMMARY

[0003] The utility model is to provide a kind of AC-DC large current power supply circuit, to solve the problem raised in the above background technology.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of AC-DC large current power supply circuit, comprising:

[0006] Capacitor voltage reduction module, for by capacitor 220V AC voltage reduction and output to rectification filter module;

[0007] Rectification filter module, for converting the AC voltage after voltage reduction into DC power, output to high-frequency switch module;

[0008] High-frequency switch module, for isolating output to rectification output module by DC power through high-frequency switch;

[0009] Rectification output module, for outputting maximum 135mA DC power supply;

[0010] Capacitor voltage reduction module connects rectification filter module, rectification filter module connects high-frequency switch module, high-frequency switch module connects rectification output module.

[0011] As the further scheme of the utility model: capacitor voltage reduction module includes resistance R1, resistance R2, capacitor C1, one end of capacitor C1 is connected with zero line N, one end of resistance R1, the other end of capacitor C1 is connected with rectification filter module, one end of resistance R2, the other end of resistance R1 is connected with the other end of resistance R2.

[0012] As a further scheme of the utility model: the rectification filter module includes rectifier D1, capacitor C2, diode D2, the first end of rectifier D1 is connected with the firewire L, the second end of rectifier D1 is connected with capacitor voltage reducing module, the third end of rectifier D1 is connected with one end of capacitor C2, the negative pole of diode D2, high-frequency switch module, the fourth end of rectifier D1 is grounded, the other end of capacitor C2 is grounded, the positive pole of diode D2 is grounded.

[0013] As a further scheme of the utility model: the high-frequency switch module includes chip U1, magnetic ring transformer B1, capacitor C3, the model of chip U1 is JT256, the No.2 pin of chip U1 is grounded, the No.5 pin of chip U1 is connected with rectification filter module, one end of capacitor C3, the other end of capacitor C3 is grounded, the No.4, 6 pins of chip U1 are connected with the input end of magnetic ring transformer B1, the output end of magnetic ring transformer B1 is connected with rectification output module.

[0014] As a further scheme of the utility model: the rectification output module includes diode D3, diode D4, capacitor C4, resistance R3, the positive pole of diode D3 is connected with the output end first end of magnetic ring transformer B1, the positive pole of diode D4 is connected with the output end second end of magnetic ring transformer B1, the negative pole of diode D3 is connected with the negative pole of diode D4, one end of capacitor C4, one end of resistance R3, the other end of capacitor C4 is grounded, the other end of resistance R3 is grounded.

[0015] Compared with the prior art, the utility model has the advantages that: in the capacitor voltage reducing module of the utility model, small volume voltage reducing capacitor is used, in the high-frequency switch module, DC-DC secondary voltage transformation is realized through high-frequency oscillation, larger current output is obtained, the direct current power supply mode is small in size, low in cost and strong in practicality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an AC-to-DC large current power supply circuit schematic diagram.

[0017] Figure 2 It is an AC-to-DC large current power supply circuit schematic diagram. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to 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 the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0019] Please refer to Figure 1 An AC-to-DC large current power supply circuit, comprising:

[0020] Capacitor voltage reduction module, for reducing 220V AC voltage through capacitor and outputting to rectifier filter module;

[0021] Rectifier filter module, for converting reduced AC voltage into DC voltage and outputting to high-frequency switch module;

[0022] High-frequency switch module, for isolating outputting DC voltage through high-frequency switch to rectifier output module;

[0023] Rectifier output module, for outputting maximum 135mA DC power supply;

[0024] Capacitor voltage reduction module connects rectifier filter module, rectifier filter module connects high-frequency switch module, and high-frequency switch module connects rectifier output module.

[0025] In the embodiment, please refer to Figure 2 , the capacitor voltage reduction module includes resistor R1, resistor R2, capacitor C1, one end of the capacitor C1 is connected to the neutral line N and one end of the resistor R1, the other end of the capacitor C1 is connected to the rectifier filter module and one end of the resistor R2, the other end of the resistor R1 is connected to the other end of the resistor R2.

[0026] The capacitor C1 realizes capacitor voltage reduction, reduces 220V AC voltage into low-voltage AC voltage, the capacitor C1 is 0.68uF 400V, and the maximum passing current is 45mA.

[0027] In the embodiment, please refer to Figure 2 , the rectifier filter module includes rectifier D1, capacitor C2, diode D2, the first end of the rectifier D1 is connected to the live wire L, the second end of the rectifier D1 is connected to the capacitor voltage reduction module, the third end of the rectifier D1 is connected to one end of the capacitor C2, the negative electrode of the diode D2 and the high-frequency switch module, the fourth end of the rectifier D1 is grounded, the other end of the capacitor C2 is grounded, and the positive electrode of the diode D2 is grounded.

[0028] The low-voltage AC voltage is converted into DC voltage through the rectifier D1, becomes smooth DC voltage after being filtered through the capacitor C2, and outputs stable voltage after being filtered through the voltage stabilizing diode D2, the diode D2 is a 36V voltage stabilizing tube, so that the VCC obtains 36V 45mA DC power supply.

[0029] In the embodiment, please refer to Figure 2 , the high-frequency switch module includes chip U1, magnetic ring transformer B1 and capacitor C3, the model of the chip U1 is JT256, the 2nd pin of the chip U1 is grounded, the 5th pin of the chip U1 is connected to the rectifier filter module and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the 4th and 6th pins of the chip U1 are connected to the input end of the magnetic ring transformer B1, and the output end of the magnetic ring transformer B1 is connected to the rectifier output module.

[0030] After the voltage input chip U1, by controlling the conduction state of the internal switch of the chip U1, the voltage size output to the magnetic ring transformer B1 is controlled, and after the magnetic ring transformer B1, it is output to the rectifier output module.

[0031] In this embodiment: please see Figure 2 , the rectifier output module includes diode D3, diode D4, capacitor C4, resistor R3, the positive electrode of diode D3 is connected with the output end first end of magnetic ring transformer B1, the positive electrode of diode D4 is connected with the output end second end of magnetic ring transformer B1, the negative electrode of diode D3 is connected with the negative electrode of diode D4, one end of capacitor C4 and one end of resistor R3, the other end of capacitor C4 is grounded, and the other end of resistor R3 is grounded.

[0032] Diode D3 and diode D4 rectify, capacitor C4 filters, so that the final output DC level is stable, and the ratio of magnetic ring transformer B1 is 3:1; so that 12V maximum 135mA DC power supply is obtained at VO, and a power supply with larger current output is successfully obtained by using small volume capacitor C1 and high frequency oscillation circuit (high frequency switch module).

[0033] The working principle of the utility model is: the capacitor voltage reduction module is used for outputting to the rectifier filter module after reducing 220V alternating current through the capacitor; the rectifier filter module is used for converting the reduced alternating current into direct current and outputting to the high frequency switch module; the high frequency switch module is used for isolating and outputting to the rectifier output module after the direct current passes through the high frequency switch; and the rectifier output module is used for outputting the maximum 135mA direct current power supply.

[0034] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0035] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. An AC-to-DC high current power supply circuit, characterized by comprising: The alternating current to direct current large current power supply circuit comprises: The capacitor voltage reduction module is used for outputting 220V alternating current after voltage reduction through a capacitor to the rectification filter module; The rectification filter module is used for converting the voltage-reduced alternating current into direct current and outputting the direct current to the high-frequency switch module; The high-frequency switch module is used for isolating and outputting the direct current to the rectification output module through high-frequency switching; The rectification output module is used for outputting a maximum of 135mA direct current power supply; The capacitor voltage reduction module is connected with the rectification filter module, the rectification filter module is connected with the high-frequency switch module, and the high-frequency switch module is connected with the rectification output module.

2. The AC-to-DC high current power supply circuit of claim 1, wherein, The capacitor voltage reduction module comprises a resistor R1, a resistor R2 and a capacitor C1, one end of the capacitor C1 is connected with a zero line N and one end of the resistor R1, the other end of the capacitor C1 is connected with the rectification filter module and one end of the resistor R2, and the other end of the resistor R1 is connected with the other end of the resistor R2.

3. The AC-to-DC high current power supply circuit of claim 1, wherein, The rectification filter module comprises a rectifier D1, a capacitor C2 and a diode D2, a first end of the rectifier D1 is connected with a live line L, a second end of the rectifier D1 is connected with the capacitor voltage reduction module, a third end of the rectifier D1 is connected with one end of the capacitor C2, a negative electrode of the diode D2 and the high-frequency switch module, a fourth end of the rectifier D1 is grounded, the other end of the capacitor C2 is grounded, and a positive electrode of the diode D2 is grounded.

4. The AC-to-DC high current power supply circuit of claim 1, wherein, The high-frequency switch module comprises a chip U1, a magnetic ring transformer B1 and a capacitor C3, the chip U1 is of a JT256 type, a 2nd pin of the chip U1 is grounded, a 5th pin of the chip U1 is connected with the rectification filter module and one end of the capacitor C3, the other end of the capacitor C3 is grounded, 4th and 6th pins of the chip U1 are connected with input ends of the magnetic ring transformer B1, and output ends of the magnetic ring transformer B1 are connected with the rectification output module.

5. The AC-to-DC high current power supply circuit of claim 4, wherein, The rectification output module comprises a diode D3, a diode D4, a capacitor C4 and a resistor R3, a positive electrode of the diode D3 is connected with a first end of the output end of the magnetic ring transformer B1, a positive electrode of the diode D4 is connected with a second end of the output end of the magnetic ring transformer B1, a negative electrode of the diode D3 is connected with a negative electrode of the diode D4, one end of the capacitor C4 and one end of the resistor R3, the other end of the capacitor C4 is grounded, and the other end of the resistor R3 is grounded.

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