CN207573236U - A kind of Switching Power Supply start-up circuit - Google Patents
A kind of Switching Power Supply start-up circuit Download PDFInfo
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- CN207573236U CN207573236U CN201721659425.9U CN201721659425U CN207573236U CN 207573236 U CN207573236 U CN 207573236U CN 201721659425 U CN201721659425 U CN 201721659425U CN 207573236 U CN207573236 U CN 207573236U
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Abstract
The utility model discloses a kind of Switching Power Supply start-up circuits so that the switch power controller of the integrated start-up circuit of tradition can be applied in the system of more high input voltage.This start-up circuit includes regulator circuit and bleeder circuit.Regulator circuit is made of resistance series circuit, bleeder circuit is made of metal-oxide-semiconductor, regulator circuit is connected to input voltage both ends, and for providing a stable grid voltage, bleeder circuit is used to input voltage being divided into metal-oxide-semiconductor drain-source voltage and controller start-up circuit voltage two parts.Plural serial stage may be used in above-mentioned regulator circuit and bleeder circuit, therefore can the switch power controller of the integrated start-up circuit of tradition be applied to very high input voltage system.
Description
Technical field
The utility model is related to the start-up circuits of Switching Power Supply, more particularly to Switching Power Supply.
Background technology
In three-phase and four-line electric power system, line voltage usually all can be very high, while in order to ensure in the case where falling phase,
System accessory power supply can work normally, it is desirable to and the input voltage range of system accessory power supply is very wide, generally reach 85~
528VAC.Therefore the design of system accessory power supply is with regard to relatively difficult, the especially design of high-voltage starting circuit.
For the switch power controller on the market without integrating start-up circuit, Starting mode is usually to be reached by a resistance value
It is connected between power input voltage and start-up capacitance to the other resistance that starts of mega-ohms, starting current is provided and is charged to start-up capacitance
To complete the startup of controller.After start-up course, additional power consumption will be increased by starting the presence of resistance.Meanwhile by
It is very wide in input voltage range, it is difficult to which balance is obtained between on startup between stand-by power consumption.
For integrating the switch power controller of start-up circuit on the market, operation principle is：Using built in controller
One high voltage transistor takes electricity from power input, charges to start-up capacitance, and high voltage transistor is controlled by controller, works as controller
It completes after starting, is shut off high voltage transistor, better stand-by power consumption can be obtained.This Starting mode is short with the time is started
And stand-by power consumption it is low the advantages of, simultaneously because start-up circuit is integrated in inside controller, also with small and at low cost excellent
Point.
But 750VDC is generally reached after the busbar voltage rectification of three-phase four wire system, and this be internally integrated starts electricity
The switch power controller on road, the general pressure voltage of integrated start-up circuit only have 500~700VDC or so, are unsatisfactory for three-phase
The design requirement of four-wire system accessory power supply.
Thus, it is necessary to high-voltage starting circuit is improved so that the Switching Power Supply control of the integrated start-up circuit of tradition
Device can be applied in the system of more high input voltage and (be not limited to three-phase four wire system).
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of Switching Power Supply start-up circuit, will be traditional with solution
The problem of switch power controller of integrated start-up circuit is applied to the system of more high input voltage.
The utility model is achieved through the following technical solutions, a kind of Switching Power Supply start-up circuit, it is characterised in that：Packet
Include regulator circuit and bleeder circuit.Bleeder circuit includes n metal-oxide-semiconductor, and regulator circuit includes n+1 resistance, and n is more than or equal to 1
Integer；
N+1 resistance is sequentially connected in series, the input of the other end connecting valve power supply of first resistor, the (n+1)th resistance it is another
The input anode of one end connecting valve power supply；
The source electrode of first metal-oxide-semiconductor is connected to the internal activation circuitry input terminal of switch power controller, n-th metal-oxide-semiconductor
Drain electrode is connected to the input anode of Switching Power Supply, remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected；The grid of first metal-oxide-semiconductor
Connect the series connection node of first resistor and second resistance, the grid connection second resistance of the second metal-oxide-semiconductor and connecting for 3rd resistor
Node, the grid of n-th of metal-oxide-semiconductor connect the series connection node of the n-th resistance and the (n+1)th resistance.
Preferably, a kind of Switching Power Supply start-up circuit further includes a current-limiting resistance, one end of the current-limiting resistance
Connect the drain electrode of n-th of metal-oxide-semiconductor, the input anode of the other end connecting valve power supply of the current-limiting resistance.
Preferably, a kind of Switching Power Supply start-up circuit further includes n diode, the cathode connection of the diode
To the grid of n-th of metal-oxide-semiconductor, the anode of the diode is connected to the source electrode of n-th of metal-oxide-semiconductor.
Preferably, a kind of Switching Power Supply start-up circuit further includes n+1 capacitance, and the first capacitance is connected in parallel on the first electricity
The both ends of resistance, the second capacitance are connected in parallel on the both ends of second resistance, and the (n+1)th capacitance is connected in parallel on the both ends of the (n+1)th resistance.
Plural serial stage may be used in above-mentioned regulator circuit and bleeder circuit, therefore can be by the integrated start-up circuit of tradition
Switch power controller is applied to very high input voltage system.
Compared with prior art, the utility model has the advantages that：
1) this programme is solved is applied to more high input voltage by the switch power controller of the integrated start-up circuit of tradition
The problem of system；
2) this programme inherits the advantages of start-up circuit being integrated in switch power controller；
3) for the controller of part, built in start-up circuit also have other functions (such as detection input voltage with
Feedforward current is provided), this programme circuit can inherit its function；
4) this programme circuit is simple, at low cost, easily designed.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model embodiment one；
Fig. 2 is the circuit diagram of the utility model embodiment two；
Fig. 3 is the circuit diagram of the utility model embodiment three；
Fig. 4 is the circuit diagram of the utility model embodiment four.
Specific embodiment
First embodiment
In first embodiment, regulator circuit includes resistance R1 and resistance R2, R1 and R2 connect, one end connection of series circuit
The input anode HVDC of Switching Power Supply, the input of the other end connecting valve power supply of series circuit；Regulator circuit includes metal-oxide-semiconductor
The grid of Q1, Q1 are connected to the tie point of R1 and R2, and the drain electrode of Q1 is connected to the source of input the anode HVDC, Q1 of Switching Power Supply
Pole is connected to the internal activation circuitry input terminal HV pins of switch power controller U1, powers for U1.
Circuit operation principle is as follows：
The grid regulator circuit of metal-oxide-semiconductor Q1 is constituted by resistance R1 and R2.It, can be with since the input impedance of Q1 is very big
Input voltage Vg is approximately considered, by the potential-divider network of R1 and R2, obtains stable grid voltage-to-ground Vgg.Therefore have following
Formula：
Input voltage Vg is divided into the start-up circuit voltage V of the drain-source voltage Vds and U1 of Q1HV.Therefore there is the following formula：
Vg=Vds+VHV
Metal-oxide-semiconductor Q1 is operated in saturation region at this time, and the type of drive of Q1 is source drive, and grid voltage-to-ground is by its voltage stabilizing
Circuit is stablized, and the source electrode above earth potential that gate source voltage Vgs is about the cut-in voltage VT, Q1 of metal-oxide-semiconductor is：
Vss=VHV=Vgg-Vgs
Joint above formula, obtains：
As long as from above formula as can be seen that selecting the resistance value of suitable R1 and R2, it is possible to adjust the drain-source voltage of Q1
The start-up circuit voltage V of Vds and U1HV.Ensure that the start-up circuit voltage of U1 ensures in rational range in this way, i.e.,
In the input voltage upper limit, no more than its pressure-resistant specification, while in input voltage lower limit, reach controller internal activation circuitry
Cut-in voltage.
The start-up course of switch power controller is as follows：
Stage one：When input terminal impact input voltage, Vg will be begun to ramp up from 0V, due to having Q1 grid regulator circuits, Q1
Vgg synchronize rise.The start-up circuit voltage V of the drain-source voltage Vds and U1 of Q1HVDivided by above-mentioned voltage distribution principle
Match.Although the start-up circuit inside U1 works not yet, the drain-source current there are still leakage current, therefore Q1 is needed equal to U1's
Start-up circuit leakage current.Q1 is operated in saturation workspace at this time, and Vgs is about the startup voltage VT of metal-oxide-semiconductor, is only needed at this time very
Small Vgs voltages just form " inversion layer ", it is possible to provide faint drain-source current inside metal-oxide-semiconductor.For certain controls
The start-up circuit of device, if this stage there is no any leakage current, it is understood that be in cut-off region for Q1.
Stage two：As the V of U1HVWhen reaching the cut-in voltage of internal activation circuitry, U1 is flowed through in internal activation circuitry work
Start-up circuit electric current will become larger suddenly, it is understood that be lower suddenly for the Vss of Q1, i.e. the Vgs of Q1 becomes larger, in MOS pipes
The conducting channel in portion will increase, therefore can provide more drain-source currents.The drain-source current of Q1 will follow U1 to start electricity at this time
The electric current on road.The voltage of Vcc capacitances Ca outside U1 will rise, until controller starts successfully.
Stage three：After controller U1 starts successfully, internal start-up circuit electric current becomes smaller until closing, can also manage
It solves and is increased for the Vss of Q1, is i.e. the Vgs of Q1 becomes smaller, and the conducting channel inside metal-oxide-semiconductor is reduced, until disappearing.
Stage four：For the controller of part, HV pins also have other functions, such as detection input voltage to carry
For feedforward current.Therefore after controller U1 starts successfully, HV pins still have electric current inflow, therefore the conductive communication in Q1 is not
It can disappear, but there are still a Vgs, for providing faint drain-source current.
Above procedure is summarized it is found that abilities of the Vgs of Q1 with automatic adjustment, can be equal to Q1 drain-source currents and flow into U1
HV pins electric current.
Second embodiment
On the basis of first embodiment, regulator circuit increases electric capacity of voltage regulation C1 and C2, and electric capacity of voltage regulation C1 is connected in parallel on resistance
The both ends of R1, electric capacity of voltage regulation C2 are connected in parallel on the both ends of R2, and the effect of electric capacity of voltage regulation C1 and C2 are to stablize the grid electricity of metal-oxide-semiconductor Q1
Pressure improves antijamming capability.
In addition, bleeder circuit can also be mainly voltage stabilizing by increasing the effect of diode D1, D1, for protecting metal-oxide-semiconductor
Q1.The cathode of D1 is connected to the grid of metal-oxide-semiconductor Q1, and the anode of D1 is connected to the source electrode of metal-oxide-semiconductor Q1.
Further, bleeder circuit further includes current-limiting resistance Ra, and the drain electrode of metal-oxide-semiconductor Q1 is accessed by current-limiting resistance Ra to be switched
The input anode HVDC of power supply.Ra's act as limitation size of current, prevents Q1 from being damaged because electric current is excessive.
Operation principle is identical with the first embodiment, and details are not described herein.
3rd embodiment
3rd embodiment is that circuit is applied embodiment in more high input voltage, what is different from the first embodiment is that it is steady
Volt circuit increases resistance R3, and R1, R2 and R3 are sequentially connected in series, the input anode of one end connecting valve power supply of series circuit
HVDC, the input of the other end connecting valve power supply of series circuit；Bleeder circuit increases metal-oxide-semiconductor Q2, and the grid of metal-oxide-semiconductor Q1 connects
The tie point of R1 and R2 are connected to, the drain electrode of metal-oxide-semiconductor Q1 is connected to the source electrode of metal-oxide-semiconductor Q2, and the source electrode of metal-oxide-semiconductor Q1 is connected to switch
The internal activation circuitry input terminal HV pins of power-supply controller of electric U1, the grid of metal-oxide-semiconductor Q2 are connected to the tie point of R2 and R3, MOS
The drain electrode of pipe Q2 is connected to the input anode HVDC of Switching Power Supply.
The same first embodiment of circuit operation principle divides, therefore can be applicable to input voltage more because metal-oxide-semiconductor Q1 and Q2 connect
High occasion.
Fourth embodiment
On the basis of 3rd embodiment, it is further added by multistage voltage stabilizing and metal-oxide-semiconductor series connection bleeder circuit.Regulator circuit is by electricity
It hinders R1, R2, R3 to form to Rn+1, metal-oxide-semiconductor series connection bleeder circuit is made of Q1, Q2 to Qn.N is the integer more than or equal to 1.Often
The grid of a metal-oxide-semiconductor is connected to the voltage stabilizing node of corresponding resistance series connection, and the source electrode of first metal-oxide-semiconductor is connected to Switching Power Supply control
The internal activation circuitry input terminal HV pins of device U1 processed, the drain electrode of n-th of metal-oxide-semiconductor are connected to the input anode of Switching Power Supply
HVDC, remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected.
The same first embodiment of circuit operation principle, because the plural serial stage of metal-oxide-semiconductor divides, therefore can be applicable to input voltage more
High occasion.
5th embodiment
Unlike fourth embodiment, it is connected in parallel with a capacitor, can opens to each resistance both ends in regulator circuit
Stablize the effect of the grid voltage of MOS pipes, improve antijamming capability.
Preferably, can also one diode of parallel connection, effect be mainly between the grid and source electrode of n-th of metal-oxide-semiconductor
Voltage stabilizing, for protecting metal-oxide-semiconductor.The cathode of n-th of diode is connected to the grid of n-th of metal-oxide-semiconductor, the anode of n-th of diode
It is connected to the source electrode of n-th of metal-oxide-semiconductor.
Further, it can also connect one between the drain electrode of n-th of metal-oxide-semiconductor and the input anode HVDC of Switching Power Supply
Current-limiting resistance Ra's, Ra act as limitation size of current, prevents n-th of metal-oxide-semiconductor Qn from being damaged because electric current is excessive.
It the above is only the preferred embodiment of the utility model, it is noted that above-mentioned preferred embodiment should not regard
For the limitation to the utility model, the scope of protection of the utility model should be subject to claim limited range.For
For those skilled in the art, without departing from the spirit and scope of the utility model, it can also make several
Improvements and modifications, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (5)
1. a kind of Switching Power Supply start-up circuit, it is characterised in that：Including regulator circuit and bleeder circuit；Bleeder circuit includes n
Metal-oxide-semiconductor, regulator circuit include n+1 resistance, and n is the integer more than or equal to 1；
N+1 resistance is sequentially connected in series, the input of the other end connecting valve power supply of first resistor, the other end of the (n+1)th resistance
The input anode of connecting valve power supply；
The source electrode of first metal-oxide-semiconductor is connected to the internal activation circuitry input terminal of switch power controller, the drain electrode of n-th of metal-oxide-semiconductor
The input anode of Switching Power Supply is connected to, remaining each metal-oxide-semiconductor drain electrode and source electrode are sequentially connected；The grid connection of first metal-oxide-semiconductor
The series connection node of first resistor and second resistance, the grid connection second resistance of the second metal-oxide-semiconductor and the series connection node of 3rd resistor,
The grid of n-th of metal-oxide-semiconductor connects the series connection node of the n-th resistance and the (n+1)th resistance.
2. a kind of Switching Power Supply start-up circuit according to claim 1, it is characterised in that：Further include a current-limiting resistance, institute
The one end for stating current-limiting resistance connects the drain electrode of n-th of metal-oxide-semiconductor, and the input of the other end connecting valve power supply of the current-limiting resistance is just
Pole.
3. a kind of Switching Power Supply start-up circuit according to claim 1 or 2, it is characterised in that：N diode is further included,
The cathode of n-th of diode is connected to the grid of n-th of metal-oxide-semiconductor, and the anode of n-th of diode is connected to n-th
The source electrode of metal-oxide-semiconductor.
4. a kind of Switching Power Supply start-up circuit according to claim 1 or 2, it is characterised in that：N+1 capacitance is further included,
First capacitance is connected in parallel on the both ends of first resistor, and the second capacitance is connected in parallel on the both ends of second resistance, and the (n+1)th capacitance is connected in parallel on n-th+
The both ends of 1 resistance.
5. a kind of Switching Power Supply start-up circuit according to claim 3, it is characterised in that：N+1 capacitance is further included, n is
Integer more than or equal to 1；First capacitance is connected in parallel on the both ends of first resistor, and the second capacitance is connected in parallel on the both ends of second resistance, and n-th
+ 1 capacitance is connected in parallel on the both ends of the (n+1)th resistance.
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| CN201721659425.9U CN207573236U (en) | 2017-12-04 | 2017-12-04 | A kind of Switching Power Supply start-up circuit |
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| CN201721659425.9U CN207573236U (en) | 2017-12-04 | 2017-12-04 | A kind of Switching Power Supply start-up circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947556A (en) * | 2017-12-04 | 2018-04-20 | 广州金升阳科技有限公司 | A kind of Switching Power Supply start-up circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947556A (en) * | 2017-12-04 | 2018-04-20 | 广州金升阳科技有限公司 | A kind of Switching Power Supply start-up circuit |
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