CN206807283U - A kind of start-up circuit of Switching Power Supply - Google Patents

A kind of start-up circuit of Switching Power Supply Download PDF

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Publication number
CN206807283U
CN206807283U CN201720470558.5U CN201720470558U CN206807283U CN 206807283 U CN206807283 U CN 206807283U CN 201720470558 U CN201720470558 U CN 201720470558U CN 206807283 U CN206807283 U CN 206807283U
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CN
China
Prior art keywords
circuit
voltage
resistance
semiconductor
oxide
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Expired - Fee Related
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CN201720470558.5U
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Chinese (zh)
Inventor
胡成才
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Shenzhen Source Of Power Technology Co Ltd
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Shenzhen Source Of Power Technology Co Ltd
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Abstract

The utility model proposes a kind of start-up circuit of Switching Power Supply, including on-off circuit, start-up circuit also includes transformer circuit, mu balanced circuit, wherein, the input of transformer circuit is connected with applied input voltage, the output end of transformer circuit is connected after being concatenated with mu balanced circuit with IC power supply positive poles, the input of on-off circuit is connected to the common junction of transformer circuit and mu balanced circuit, the output end of on-off circuit is connected with IC power supply positive poles, before start-up circuit normal work, powered by on-off circuit to IC, after start-up circuit normal work, powered by mu balanced circuit to IC.It is fast to implement the start-up circuit toggle speed of the Switching Power Supply of the technical solution of the utility model, small power consumption.

Description

A kind of start-up circuit of Switching Power Supply
Technical field
A kind of start-up circuit is the utility model is related to, more particularly to a kind of start-up circuit of Switching Power Supply.
Background technology
Switching Power Supply is to utilize modern power electronics technology, the time ratio that controlling switch pipe turns on and off, and remains steady Determine a kind of power supply of output voltage, Switching Power Supply is typically made up of pulse width modulation (PWM) control IC and MOSFET.With electricity The development and innovation of power electronic technology so that switch power technology is also innovated constantly.At present, Switching Power Supply is with small-sized, light Amount and efficient feature are widely used almost all of electronic equipment, are that current electronics and information industry rapid development is indispensable A kind of few power mode.
The start-up circuit of traditional Switching Power Supply is the positive pole (VBUSS that startup resistance has been connected directly between to BUCK electric capacity +) between IC power supplies just (VCC+), because voltage difference is between 120~380V between VBUSS+ and VCC+, so starting resistance Power consumption can be very big, will certainly so influence the whole efficiency and stand-by power consumption of power supply, can not meet the requirement of Energy Star.Cause For the reason of power consumption, starting resistance can not be too small, causes toggle speed slower.
Utility model content
In order to solve the problems, such as the above, the utility model provides that a kind of toggle speed is fast, small power consumption Switching Power Supply opens Dynamic circuit.
The utility model discloses a kind of Switching Power Supply start-up circuit, including on-off circuit, described start-up circuit also wraps Transformer circuit, mu balanced circuit are included, wherein, the input of described transformer circuit is connected with applied input voltage, described Transformer circuit output end and mu balanced circuit concatenate after be connected with IC power supply positive poles, the input company of described on-off circuit It is connected to the common junction of described transformer circuit and mu balanced circuit, output end and IC the power supply positive pole phase of described on-off circuit Connect, before start-up circuit normal work, powered by described on-off circuit to described IC, after start-up circuit normal work, by Described mu balanced circuit is powered to described IC.
Further, described transformer circuit includes:Transformer, the 6th resistance, the first diode, the second electric capacity, its In, the external input voltage of described transformer inputs, the first output end and the 6th resistance, the one or two pole of described transformer Mu balanced circuit input is input to after the anode series of pipe, the negative electrode of the first diode after the second capacitance series with being grounded, transformation Another output head grounding of device.
Further, described mu balanced circuit includes:7th resistance, the 3rd voltage-regulator diode, NPN type triode, second Diode, the 3rd electric capacity, the 4th electric capacity, wherein, one end after the 7th described resistance concatenates with the negative electrode of the 3rd voltage-regulator diode It is connected with the output end of transformer circuit first, the other end is grounded after being connected with the anode of the 3rd described voltage-regulator diode; The NPN type triode colelctor electrode connects with the output end of transformer circuit first, the NPN type triode base stage with it is described 7th resistance, the negative electrode common junction of the 3rd voltage-regulator diode are connected, and the NPN type triode emitter stage connects the second diode Anode after be linked into IC inputs;3rd electric capacity, the 4th electric capacity and after connecing, its one end accesses the moon of the second diode Pole, other end ground connection.
Further, described on-off circuit includes:First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th Resistance, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the first electric capacity, the first voltage-regulator diode, the second voltage-regulator diode, the described first electricity One end is connected with VBUSS+ after resistance, second resistance, 3rd resistor concatenation, and the other end is connected with the drain electrode of the first metal-oxide-semiconductor;Described Five resistance, the first electric capacity first metal-oxide-semiconductor grid of latter termination in parallel, the other end are grounded after being connected with the first metal-oxide-semiconductor source electrode;It is described First voltage-regulator diode negative electrode connects with the drain electrode of the first metal-oxide-semiconductor, and its anode connects with the source electrode of the first metal-oxide-semiconductor to be grounded in the lump;Institute State the 4th resistance one end with VBUSS+ to be connected, the other end is connected with second metal-oxide-semiconductor drain electrode;The second metal-oxide-semiconductor grid with The drain electrode of first metal-oxide-semiconductor connects, and its source electrode connects with IC;The second voltage-regulator diode anode connects the first metal-oxide-semiconductor grid, its negative electrode It is connected with the common junction of the transforming circuit and the mu balanced circuit.
Further, the second described voltage-regulator diode is higher than described IC startup voltage.
Implement a kind of start-up circuit of Switching Power Supply of the present utility model, there is technique effect beneficial below:
It is different from existing technology that conventional start-up circuit toggle speed is slow, power consumption is big, the technical solution of the utility model Toggle speed is fast, small power consumption.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only It is some embodiments of the utility model, for those of ordinary skill in the art, before creative labor is not paid Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the start-up circuit schematic diagram of embodiment Switching Power Supply of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, embodiment of the present utility model, a kind of start-up circuit of Switching Power Supply, including on-off circuit 10, open Dynamic circuit also includes transformer circuit 20, mu balanced circuit 30, wherein, input and the applied input voltage phase of transformer circuit 20 Connection, the output end of transformer circuit 20 are connected after being concatenated with mu balanced circuit 30 with IC40 positive poles of powering, on-off circuit 10 it is defeated Enter the common junction that end is connected to transformer circuit 20 and mu balanced circuit 30, output end and the IC40 power supply positive poles of on-off circuit 10 It is connected, before start-up circuit normal work, is powered by on-off circuit 10 to IC40, after start-up circuit normal work, by voltage stabilizing electricity Road 30 powers to IC40.
Transformer circuit 20 includes:Transformer TIB, the 6th resistance R6, the first diode D1, the second electric capacity C2, wherein, become The external input voltage of depressor TIB inputs, transformer TIB the first output end and the 6th resistance R6, the first diode D1 sun The input of mu balanced circuit 30 is input to after the concatenation of pole, the first diode D1 negative electrode is grounded after being concatenated with the second electric capacity C2, transformation Device TIB another output head grounding.
Mu balanced circuit 30 includes:7th resistance R7, the 3rd voltage-regulator diode ZD 3, NPN type triode Q3, the second diode D 2, the 3rd electric capacity C 3, the 4th electric capacity C 4, wherein, the 7th resistance R 7 concatenates latter with the 3rd voltage-regulator diode ZD3 negative electrode End is connected with the output end of transformer circuit 20 first, and the other end is the 3rd voltage-regulator diode ZD3 plus earth;The pole of NPN type three The colelctor electrodes of pipe Q 3 connect with the output end of transformer circuit 20 first, the base stages of NPN type triode Q 3 and the 7th resistance R the 7, the 3rd Voltage-regulator diode ZD3 negative electrode common port is connected, and the anode that the emitter stages of NPN type triode Q 3 connect the second diode D 2 is followed by Enter to IC40 inputs;3rd electric capacity C 3, the 4th electric capacity C 4 and after connecing, its one end accesses the second diode D 2 negative electrode, separately One end is grounded.
On-off circuit 10 includes:First resistor R1, second resistance R 2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first metal-oxide-semiconductor Q 1, the second metal-oxide-semiconductor Q 2, the first electric capacity C 1, the first voltage-regulator diode ZD 1, the second voltage-regulator diode ZD 2, first resistor R 1, second resistance R 2,3rd resistor R 3 concatenate after one end be connected with VBUSS+, the other end and the first metal-oxide-semiconductor Q 1 drain electrode is connected;5th resistance R 5, the first electric capacity C 1 latter termination grids of the first metal-oxide-semiconductor Q 1 in parallel, the other end and the The source electrodes of one metal-oxide-semiconductor Q 1 are grounded after being connected;The negative electrodes of first voltage-regulator diode ZD 1 connect with the first metal-oxide-semiconductor Q 1 drain electrodes, its anode Connect with the first metal-oxide-semiconductor Q 1 source electrode and be grounded in the lump;The one end of 4th resistance R 4 is connected with VBUSS+, the other end and the 2nd MOS The drain electrodes of pipe Q 2 are connected;The grids of second metal-oxide-semiconductor Q 2 connect with the first metal-oxide-semiconductor Q 1 drain electrodes, and its source electrode connects with IC40;Second is steady Pressure diode ZD2 anodes connect the first metal-oxide-semiconductor Q1 grids, and its negative electrode is connected with the common port of transforming circuit 20 and mu balanced circuit 30.
Second voltage-regulator diode ZD2 is higher than IC40 startup voltage.
It is further illustrated below as follows:
One, parameter settings:
1. the second voltage-regulator diode ZD2 is higher than IC40 startup voltage VON
2. the 4th resistance R4 power consumptions:P=(VBUS-VON) ^2/R4
Two, operation principles:
1. before starting, transformer TIB does not power, and diode D1 cut-offs, electric capacity C2 voltages are zero, and voltage-regulator diode ZD2 is cut Only.Metal-oxide-semiconductor Q2 gate high-voltages, metal-oxide-semiconductor Q2 conductings, charged by resistance R4 to electric capacity C3, when electric capacity C4 voltages reach IC40 Lowest starting voltage after, IC40 start start work.
2. starting the incipient stage, transformer TIB starts to power, and diode D1 conductings, electric capacity C2 voltages are begun to ramp up, voltage stabilizing Diode ZD2 is still off, metal-oxide-semiconductor Q2 gate high-voltages, metal-oxide-semiconductor Q2 conductings, is charged by resistance R4 to electric capacity C3, and provide Electric current needed for IC40 work.
3. after starting during normal work, transformer TIB starts to power, and diode D1 conductings, electric capacity C2 voltages rise to greatly In voltage-regulator diode ZD2 voltage stabilizing value, voltage-regulator diode ZD1 reverse-conductings, metal-oxide-semiconductor Q1 is turned on, metal-oxide-semiconductor Q2 grid low-voltages, Metal-oxide-semiconductor Q2 is turned off, and resistance R4 no longer powers to electric capacity C4.Now diode D2 starts that IC40 work is powered and provided to electric capacity C4 Required electric current.
Have in practice been verified that, the utility model advantage is:
1. using the Switching Power Supply of conventional start-up circuit in input voltage 90VAC, the startup time is generally the 2-3 seconds, and Using this case low-power consumption fast start circuit Switching Power Supply in 90VAC input voltages, start the time be about 0.5 second.
2. using the Switching Power Supply of conventional start-up circuit in input voltage 230VAC, the power consumption for starting resistance can reach 1- 2W, and in the low-power consumption fast start circuit of this case, startup resistance is disconnected after power supply normal work, will not produce work( Consumption.
Implement a kind of start-up circuit of Switching Power Supply of the present utility model, there is technique effect beneficial below:
It is different from existing technology that conventional start-up circuit toggle speed is slow, power consumption is big, and the technical solution of the utility model opens Dynamic speed is fast, small power consumption.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc., the utility model should be included in Protection domain within.

Claims (5)

1. a kind of start-up circuit of Switching Power Supply, including on-off circuit, it is characterised in that described start-up circuit also includes transformation Device circuit, mu balanced circuit, wherein, the input of described transformer circuit is connected with applied input voltage, described transformation The output end of device circuit is connected with IC power supply positive poles again with after described mu balanced circuit concatenation, the input of described on-off circuit It is connected to the common junction of described transformer circuit and mu balanced circuit, output end and the IC power supply positive poles of described on-off circuit It is connected, before start-up circuit normal work, is powered by described on-off circuit to described IC, after start-up circuit normal work, Powered by described mu balanced circuit to described IC.
2. start-up circuit according to claim 1, it is characterised in that described transformer circuit includes:Transformer (TIB), the 6th resistance (R6), the first diode (D1), the second electric capacity (C2), wherein, outside described transformer (TIB) input Connect input voltage, the first output end of described transformer (TIB) and the 6th resistance (R6), the anode series of the first diode (D1) It is input to mu balanced circuit input after connecing again, the negative electrode of the first diode (D1) is grounded after being concatenated with the second electric capacity (C2), transformation Another output head grounding of device (TIB).
3. start-up circuit according to claim 1, it is characterised in that described mu balanced circuit includes:7th resistance (R7), 3rd voltage-regulator diode (ZD3), NPN type triode (Q3), the second diode (D2), the 3rd electric capacity (C3), the 4th electric capacity (C4), Wherein, one end and the transformer circuit after the 7th described resistance (R7) concatenates with the negative electrode of the 3rd voltage-regulator diode (ZD3) First output end is connected, and the other end is the plus earth of the 3rd voltage-regulator diode (ZD3);NPN type triode (Q3) current collection Pole connects with the first output end of the transformer circuit, NPN type triode (Q3) base stage and the 7th resistance (R7), The negative electrode common junction of 3rd voltage-regulator diode (ZD3) is connected, and NPN type triode (Q3) emitter stage connects the second diode (D2) IC inputs are linked into after anode;3rd electric capacity (C3), the 4th electric capacity (C4) and after connecing, its one end access second The negative electrode of diode (D2), other end ground connection.
4. the Switching Power Supply start-up circuit according to any one of claims 1 to 3, it is characterised in that described on-off circuit Including:First resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the first MOS Manage (Q1), the second metal-oxide-semiconductor (Q2), the first electric capacity (C1), the first voltage-regulator diode (ZD1), the second voltage-regulator diode (ZD2), institute One end is connected with VBUSS+ after the first resistor (R1) stated, second resistance (R2), 3rd resistor (R3) concatenation, the other end and first The drain electrode of metal-oxide-semiconductor (Q1) is connected;5th resistance (R5), the first electric capacity (C1) latter termination the first metal-oxide-semiconductor (Q1) grid in parallel Pole, the other end are grounded after being connected with the first metal-oxide-semiconductor (Q1) source electrode;First voltage-regulator diode (ZD1) negative electrode and the first metal-oxide-semiconductor (Q1) drain electrode connects, and its anode connects with the source electrode of the first metal-oxide-semiconductor (Q1) to be grounded in the lump;Described 4th resistance (R4) one end with VBUSS+ is connected, and the other end is connected with second metal-oxide-semiconductor (Q2) drain electrode;Second metal-oxide-semiconductor (Q2) grid and the first metal-oxide-semiconductor (Q1) drain electrode connects, and its source electrode connects with IC;Second voltage-regulator diode (ZD2) anode connects the first metal-oxide-semiconductor (Q1) grid, its Negative electrode is connected with the common junction of the transformer circuit and the mu balanced circuit.
5. Switching Power Supply start-up circuit according to claim 4, it is characterised in that the second described voltage-regulator diode (ZD2) it is higher than described IC startup voltage.
CN201720470558.5U 2017-04-28 2017-04-28 A kind of start-up circuit of Switching Power Supply Expired - Fee Related CN206807283U (en)

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Application Number Priority Date Filing Date Title
CN201720470558.5U CN206807283U (en) 2017-04-28 2017-04-28 A kind of start-up circuit of Switching Power Supply

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020062818A1 (en) * 2018-09-28 2020-04-02 深圳市崧盛电子股份有限公司 Circuit for improving power supply starting time, and driving power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020062818A1 (en) * 2018-09-28 2020-04-02 深圳市崧盛电子股份有限公司 Circuit for improving power supply starting time, and driving power supply

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20171226

Termination date: 20200428

CF01 Termination of patent right due to non-payment of annual fee