CN209267437U - A kind of AC-DC large power supply front end soft-start circuit - Google Patents

Abstract

The utility model relates to a kind of AC-DC large power supply front end soft-start circuits, including current rectifying and wave filtering circuit, current rectifying and wave filtering circuit includes the filter circuit unit, rectification circuit unit, voltage regulator circuit unit being sequentially electrically connected, it further include delay control circuit, which is set between filter circuit unit and rectification circuit unit；The AC-DC large power supply front end soft-start circuit, it is electrically connected by capacitor C3 with resistance R3 and metal-oxide-semiconductor gate pole, grid, at the beginning of circuit work, it needs to charge to capacitor C3, so that the AC-DC large power supply front end soft-start circuit is in delay startup delay working, the delay startup requirement of the high-power AC-DC power supply of 1000W or more is can satisfy, and design is simple, device is few, easy to operate.

Description

A kind of AC-DC large power supply front end soft-start circuit

Technical field

The utility model relates to power circuit technical field, and in particular to a kind of AC-DC large power supply front end delay startup electricity Road.

Background technique

Power supply apply and applied power electronics field, it is generally existing by 220V AC voltage be converted to 5V, 12V, 24V, The steady dc voltages such as 48V.220V alternating current needs the DC voltage for first rectifying, being filtered into 310V or so under normal conditions, Then steady dc voltage needed for other is generated after conversion.In the power supply system, when 220V AC voltage open moment, It to charge to filter capacitor, and to drive backend load, powered on moment has rush of current, and power gets over large inrush current Will be bigger, if untreated can damage device, power supply is caused to can not work normally.At this moment just need with soft-start circuit come Inhibit starting immediate current, gently increase voltage, to play the role of protecting back end device.

When power in 200W hereinafter, on input ac voltage connect a NTC resistance can play delay startup effect Fruit, power is silicon-controlled with control circuit control greater than the power supply of 200W to 1000W, also can satisfy the requirement of delay startup.But electricity Source power requirement is higher and higher, and the power supply greater than 1000W has been unable to satisfy requirement using first two soft-start circuit.

Summary of the invention

The purpose of this utility model is to solve existing power supply front end soft-start circuit to be unable to satisfy power greater than 1000W Requirement the problem of.

For this purpose, the utility model provides a kind of AC-DC large power supply front end soft-start circuit, including rectifying and wave-filtering electricity Road, the current rectifying and wave filtering circuit include the filter circuit unit being sequentially electrically connected, rectification circuit unit, pressure stabilizing voltage regulator circuit list Member further includes delay control circuit, which is set between filter circuit unit and rectification circuit unit.

A kind of AC-DC large power supply front end soft-start circuit, further includes the power supply circuit of delay control circuit, The input terminal of the power supply circuit is electrically connected with the output end of the filter circuit unit, the output end and delays time to control of power supply circuit The power input of circuit is electrically connected.

The nucleus module of the power supply circuit is AC/DC converter N1, model TUHS5F12.

The delay control circuit includes divider resistance R2, divider resistance R3, capacitor C3, voltage-stabiliser tube V1, diode V2, Metal-oxide-semiconductor V3, relay K2, relay K1, one end of the divider resistance R2 are electrically connected with the output end of power supply circuit, partial pressure electricity The other end of resistance R2 is electrically connected by divider resistance R3 with ground terminal, and capacitor C3 is set to the other end and the ground connection of divider resistance R2 Between end, the power supply positive input terminal of relay K2 is electrically connected with the output end of power supply circuit, the power supply negative input end of relay K2 It is electrically connected with the drain electrode of metal-oxide-semiconductor V3, diode V2 cathode is electrically connected with the power supply positive input terminal of relay K2, diode V2 anode It is electrically connected with the drain electrode of metal-oxide-semiconductor V3, the other end of divider resistance R2 is also electrically connected with the gate pole of metal-oxide-semiconductor V3, the grid of metal-oxide-semiconductor V3 It is electrically connected with ground terminal；The normally open end of relay K2 is electrically connected with the output end of power supply circuit, relay K2 normal-closed end and ground connection End electrical connection, the common end of relay K2 are electrically connected with the cathode of voltage-stabiliser tube V1, anode and the relay K1 direct current of voltage-stabiliser tube V1 Positive input terminal electrical connection, relay K1 direct current negative input end are electrically connected with ground terminal, two ac output ends of relay K1.

Thermistor R1 is additionally provided between the filter circuit unit and rectification circuit unit.

The filter circuit unit nucleus module is filter U1, model ET-20A4BL.

The utility model has the beneficial effects that this AC-DC large power supply front end provided by the utility model delay startup is electric Road is electrically connected by capacitor C3 with resistance R3 and metal-oxide-semiconductor gate pole, grid, at the beginning of circuit work, needs to fill capacitor C3 Electricity, so that the AC-DC large power supply front end soft-start circuit can satisfy 1000W or more in delay startup delay working High-power AC-DC power supply delay startup requirement, and design that simple, device is few, easy to operate.

The utility model is described in further details below with reference to attached drawing.

Detailed description of the invention

Fig. 1 is the schematic diagram of the power supply circuit of delay control circuit.

Fig. 2 is the schematic diagram of current rectifying and wave filtering circuit.

Fig. 3 is the schematic diagram of delay control circuit.

Fig. 4 is soft-start circuit entirety schematic diagram.

Specific embodiment

Reach the technical means and efficacy that predetermined purpose is taken for the utility model is further described, below in conjunction with attached drawing And embodiment, to specific embodiment of the present utility model, structure feature and its effect, detailed description are as follows.

Embodiment 1

In order to solve the problems, such as that existing power supply front end soft-start circuit is unable to satisfy the requirement that power is greater than 1000W. Present embodiments provide a kind of AC-DC large power supply front end soft-start circuit as shown in figures 1-4, including rectifying and wave-filtering electricity Road, for alternating current 220V to be turned direct current 300V, the current rectifying and wave filtering circuit includes the filter circuit unit being sequentially electrically connected, rectification Circuit unit, pressure stabilizing voltage regulator circuit unit, further include the delay control circuit for soft-start circuit, which sets It is placed between filter circuit unit and rectification circuit unit.

A kind of AC-DC large power supply front end soft-start circuit, further includes the power supply circuit of delay control circuit, For electric energy needed for providing delay control circuit work, the output of the input terminal of the power supply circuit and the filter circuit unit End electrical connection, the output end of power supply circuit are electrically connected with the power input of delay control circuit.

Thermistor (PTC) R1 is additionally provided between the filter circuit unit and rectification circuit unit, PTC resistor R1 can It can inhibit to input dash current in powered on moment；Ω -150 DEG C of the model MZ21-2-20 of the PTC resistor R1.

As shown in Figure 1, the nucleus module of the power supply circuit is AC/DC converter N1, model TUHS5F12, it can be with Stable 12V DC voltage is converted to by 220V AC voltage.

As shown in Fig. 2, current rectifying and wave filtering circuit includes filter U1, rectifier bridge D1, capacitor C1, capacitor C2, PTC resistor R1, Input AC L connects the AC1 foot of rectifier bridge DC, input AC N after PTC resistor R1 with the AC2 foot of rectifier bridge D1, rectifier bridge D1's DC terminal is in parallel with capacitor C1, capacitor C2, when alternating voltage just powers on, prints input current by PTC resistor R1.

As shown in Figure 3, Figure 4, the delay control circuit includes divider resistance R2, divider resistance R3, capacitor C3, voltage-stabiliser tube V1, diode V2, metal-oxide-semiconductor V3, relay K2, relay K1, one end of the divider resistance R2 and the output end of power supply circuit The other end of electrical connection, divider resistance R2 is electrically connected by divider resistance R3 with ground terminal, and capacitor C3 is set to divider resistance R2 The other end and ground terminal between, the power supply positive input terminal of relay K2 is electrically connected with the output end of power supply circuit, relay K2 Power supply negative input end be electrically connected with the drain electrode of metal-oxide-semiconductor V3, diode V2 cathode and the power supply positive input terminal of relay K2 are electrically connected It connects, diode V2 anode is electrically connected with the drain electrode of metal-oxide-semiconductor V3, and gate pole of the other end of divider resistance R2 also with metal-oxide-semiconductor V3 is electrically connected It connects, the grid of metal-oxide-semiconductor V3 is electrically connected with ground terminal；The normally open end of relay K2 is electrically connected with the output end of power supply circuit, relay Device K2 normal-closed end is electrically connected with ground terminal, and the common end of relay K2 is electrically connected with the cathode of voltage-stabiliser tube V1, and voltage-stabiliser tube V1 is just Pole is electrically connected with relay K1 direct current positive input terminal, and relay K1 direct current negative input end is electrically connected with ground terminal, relay K1's Two ac output ends；The delay control circuit working principle is: power supply circuit output end 12V connection divider resistance R2, dividing Piezoresistance R3 charges to capacitor C3, controls relay K2 by triggering metal-oxide-semiconductor V3, to control relay K1, capacitor C3's is complete Time at charging is delay time.

The filter circuit unit nucleus module is filter U1, model ET-20A4BL.

The model G5V-15DC of the model D2425 of above-mentioned relay K1, relay K2, the model of metal-oxide-semiconductor V3 The model BWB3V6 of VN2222LL, voltage-stabiliser tube V1.

When practical application, in input 220V alternating current powered on moment, electric current arrives rectifier bridge by thermistor R1 again D1, through capacitor C1, capacitor C2 filtering after, give back-end circuit power supply, at this time the end the two of relay K1 AC be disconnect, electric current by Thermistor R1 limitation；After input 220V alternating current powers on, converter N1 work generates 12V power supply, and 12V passes through partial pressure Resistance R2, divider resistance R3 charge to capacitor C3, to trigger metal-oxide-semiconductor V3 conducting, jump relay K2, after K2 is jumped, after Two ends AC of electric appliance K1 are connected, and the electric current passed through before from thermistor R1 is all formed into a loop through relay K1 and rear end, R1 does not work；Powered on from input power, the time being closed to relay K1, is exactly the delay startup time of power supply, this time by Divider resistance R2, divider resistance R3 and capacitor C3 control.

In conclusion this AC-DC large power supply front end provided in this embodiment soft-start circuit, by capacitor C3 with Resistance R3 and metal-oxide-semiconductor gate pole, grid electrical connection need to charge to capacitor C3, so that the AC-DC at the beginning of circuit work Large power supply front end soft-start circuit can satisfy the high-power AC-DC electricity of 1000W or more in delay startup delay working The delay startup requirement in source, and design is simple, device is few, easy to operate.

It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard To belong to the protection scope of the utility model.

Claims (6)

1. a kind of AC-DC large power supply front end soft-start circuit, including current rectifying and wave filtering circuit, the current rectifying and wave filtering circuit include Filter circuit unit, rectification circuit unit, the pressure stabilizing voltage regulator circuit unit being sequentially electrically connected, it is characterised in that: further include delay Control circuit, the delay control circuit are set between filter circuit unit and rectification circuit unit.

2. a kind of AC-DC large power supply front end as described in claim 1 soft-start circuit, it is characterised in that: further include prolonging When control circuit power supply circuit, the input terminal of the power supply circuit is electrically connected with the output end of the filter circuit unit, powers The output end of circuit is electrically connected with the power input of delay control circuit.

3. a kind of AC-DC large power supply front end as claimed in claim 2 soft-start circuit, it is characterised in that: the power supply The nucleus module of circuit is AC/DC converter N1, model TUHS5F12.

4. a kind of AC-DC large power supply front end as described in claim 1 soft-start circuit, it is characterised in that: the delay Control circuit includes divider resistance R2, divider resistance R3, capacitor C3, voltage-stabiliser tube V1, diode V2, metal-oxide-semiconductor V3, relay K2, Relay K1, one end of the divider resistance R2 are electrically connected with the output end of power supply circuit, and the other end of divider resistance R2 passes through Divider resistance R3 is electrically connected with ground terminal, and capacitor C3 is set between the other end and ground terminal of divider resistance R2, relay K2 Power supply positive input terminal be electrically connected with the output end of power supply circuit, relay K2 power supply negative input end and metal-oxide-semiconductor V3 drain electrode Electrical connection, diode V2 cathode are electrically connected with the power supply positive input terminal of relay K2, the drain electrode of diode V2 anode and metal-oxide-semiconductor V3 Electrical connection, the other end of divider resistance R2 are also electrically connected with the gate pole of metal-oxide-semiconductor V3, and the grid of metal-oxide-semiconductor V3 is electrically connected with ground terminal； The normally open end of relay K2 is electrically connected with the output end of power supply circuit, and relay K2 normal-closed end is electrically connected with ground terminal, relay The common end of K2 is electrically connected with the cathode of voltage-stabiliser tube V1, and the anode of voltage-stabiliser tube V1 is electrically connected with relay K1 direct current positive input terminal, Relay K1 direct current negative input end is electrically connected with ground terminal, two ac output ends of relay K1.

5. a kind of AC-DC large power supply front end as described in claim 1 soft-start circuit, it is characterised in that: the filtering Thermistor R1 is additionally provided between circuit unit and rectification circuit unit.

6. a kind of AC-DC large power supply front end as described in claim 1 soft-start circuit, it is characterised in that: the filtering Circuit unit nucleus module is filter U1, model ET-20A4BL.