CN209545430U - A kind of start-up circuit and draw-out power supply of draw-out power supply - Google Patents
A kind of start-up circuit and draw-out power supply of draw-out power supply Download PDFInfo
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- CN209545430U CN209545430U CN201920039144.6U CN201920039144U CN209545430U CN 209545430 U CN209545430 U CN 209545430U CN 201920039144 U CN201920039144 U CN 201920039144U CN 209545430 U CN209545430 U CN 209545430U
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Abstract
The utility model provides the start-up circuit and draw-out power supply of a kind of draw-out power supply, the start-up circuit includes: bleeder circuit, clamp circuit, switching circuit, power supply capacitor, the connection of the forward end of bleeder circuit first input end and storage capacitor, it is grounded after the connection of the negative end of the second input terminal of bleeder circuit and storage capacitor, the output end of bleeder circuit is connect with one end of clamp circuit and switching circuit respectively, and bleeder circuit obtains the operating voltage of start-up circuit from storage capacitor；One end of clamp circuit is connect with switching circuit, and other end ground connection, clamp circuit limits the voltage value of power supply capacitor output；One end of power supply capacitor connect other end ground connection with switching circuit and control chip respectively, and power supply capacitor provides starting voltage for control chip.By implementing the utility model, without multiple start-up circuit units of connecting, circuit structure is simplified, has avoided circuit structure redundancy, there is low start voltage, high withstanding voltage, high reliablity, advantage at low cost, small in size.
Description
Technical field
The utility model relates to power electronics fields, and in particular to the start-up circuit of a kind of draw-out power supply and take can electricity
Source.
Background technique
Draw-out power supply in flexible DC transmission engineering and UPFC (THE UPFC) engineering is used for from energy storage
Energy is taken on capacitor, is the power supply such as internal controller, driver and protective device.Draw-out power supply has low start voltage, wide scope
The characteristics of input service voltage, needs under specified booting voltage conditions, provides minimum work for the control chip of draw-out power supply
Make the voltage on threshold voltage, and then ensure that Switching Power Supply can successfully start up, the self-starting performance of draw-out power supply is relationship
Can the key that operated normally to power supply, there are two types of conventional draw-out power supply start-up circuit implementations, and one is pass through high pressure
The low start voltage power supply and the voltage stress tolerance after high voltage shutdown that MOSFET realizes power supply, still, high-voltage MOSFET
It is expensive, considerably increase production cost；Another method is by conventional low voltage MOSFET (usual voltage application conditions
In the basic start-up circuit unit of the composition of 1000V or less), by way of plural serial stage, the auxiliary under lower pressure is realized
Power supply and shutdown when high pressure are exited, and still, when requiring start-up circuit withstanding voltage with higher, need to connect multiple open
Dynamic circuit unit, circuit structure are complicated.
Utility model content
The utility model embodiment provides the start-up circuit and draw-out power supply of a kind of draw-out power supply, to overcome the prior art
In start-up circuit high production cost, the problem of circuit structure complexity.
The utility model embodiment provides a kind of start-up circuit of draw-out power supply, comprising: bleeder circuit, clamp circuit,
Switching circuit, power supply capacitor, wherein the first input end of the bleeder circuit and the forward end of storage capacitor connect, and described point
Second input terminal of volt circuit is grounded after connecting with the negative end of the storage capacitor, the output end of the bleeder circuit respectively with
One end of the clamp circuit and switching circuit connection, the bleeder circuit obtain start-up circuit from the storage capacitor
Operating voltage；One end of the clamp circuit is connect with the switching circuit, the other end ground connection of the clamp circuit, described
Clamp circuit limits the voltage value of the power supply capacitor output；One end of the power supply capacitor respectively with the switching circuit and control
The connection of coremaking piece, the other end ground connection of the power supply capacitor, the power supply capacitor provide starting voltage for the control chip.
Optionally, the bleeder circuit includes: first resistor, second resistance, wherein one end of the first resistor and institute
State storage capacitor forward end connection, the other end of the first resistor respectively with one end of the second resistance, the clamper
One end of circuit and switching circuit connection, after the other end of the second resistance is connect with the negative end of the storage capacitor
Ground connection.
Optionally, the start-up circuit further include: current-limiting circuit, one end of the current-limiting circuit and the bleeder circuit
Output end connection, the other end of the current-limiting circuit are connect with one end of the clamp circuit and the switching circuit respectively, institute
Current-limiting circuit is stated for limiting the electric current of the clamp circuit.
Optionally, the current-limiting circuit includes multiple concatenated current-limiting resistances.
Optionally, the clamp circuit includes an at least voltage-stabiliser tube.
Optionally, the switching circuit includes: switch mosfet pipe, 3rd resistor and the 4th resistance, wherein the third
One end of resistance is connect with the output end of the bleeder circuit, the other end of the 3rd resistor and the switch mosfet pipe
Drain electrode connection；One end of 4th resistance is connect with the grid of the clamp circuit and the switch mosfet pipe respectively, institute
The other end for stating the 4th resistance is connect with the source electrode of one end of the storage capacitor and the switch mosfet pipe respectively.
The utility model embodiment additionally provides a kind of draw-out power supply, comprising: control chip and another reality of the utility model
Apply the start-up circuit of example offer, wherein the input terminal of the start-up circuit is connect with storage capacitor, is obtained from the storage capacitor
Operating voltage；The output end of the start-up circuit is connect with the control chip, provides starting voltage for the control chip.
Technical solutions of the utility model have the advantages that
The start-up circuit of draw-out power supply provided by the embodiment of the utility model, comprising: bleeder circuit, clamp circuit, switch
Circuit, power supply capacitor obtain the operating voltage of start-up circuit by bleeder circuit from storage capacitor, thus by adjusting partial pressure
Circuit is that the operating voltage of adjustable start-up circuit has been simplified circuit structure significantly, kept away without multiple start-up circuit units of connecting
The redundancy for having exempted from circuit structure realizes the low voltage starting of start-up circuit, withstanding voltage with higher, so that switch electricity
Road using commonly the resistance to pressure request of circuit can be met lower than switch mosfet pipe so that the start-up circuit have high reliablity, at
This advantage low, small in size.
Draw-out power supply provided by the embodiment of the utility model, comprising: control chip and start-up circuit, start-up circuit is from energy storage
Operating voltage is obtained on circuit and then provides starting voltage for control chip, by the bleeder circuit of start-up circuit from storage capacitor
The upper operating voltage for obtaining start-up circuit, to be not necessarily to by adjusting the operating voltage that bleeder circuit is adjustable start-up circuit
It connects multiple start-up circuit units, has simplified circuit structure significantly, avoided the redundancy of circuit structure, realize start-up circuit
Low voltage starting, withstanding voltage with higher are commonly opened lower than MOSFET so that the switching circuit of the start-up circuit utilizes
The resistance to pressure request of circuit can be met by closing pipe, so that the draw-out power supply has high reliablity, advantage at low cost, small in size.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the start-up circuit of draw-out power supply in the utility model embodiment；
Fig. 2 is another structural schematic diagram of the start-up circuit of draw-out power supply in the utility model embodiment；
Fig. 3 is the structural schematic diagram of draw-out power supply in the utility model embodiment.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.
In the description of the present invention, it should be noted that term " first ", " second ", " third ", " the 4th " are only used
In description purpose, it is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wireless connection, be also possible to wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
Embodiment 1
The utility model embodiment provides a kind of start-up circuit of draw-out power supply, as shown in Figure 1, the draw-out power supply opens
Dynamic circuit includes: bleeder circuit 1, clamp circuit 2, switching circuit 3, power supply capacitor C1, wherein the first input of bleeder circuit 1
End is connect with the forward end of storage capacitor Cin, after the second input terminal of bleeder circuit 1 is connect with the negative end of storage capacitor Cin
Ground connection, the output end of bleeder circuit 1 are connect with one end of clamp circuit 2 and switching circuit 3 respectively, and bleeder circuit 1 is electric from energy storage
Hold the operating voltage that start-up circuit is obtained on Cin；One end of clamp circuit 2 is connect with switching circuit 3, clamp circuit 2 it is another
End ground connection, clamp circuit 2 limit the voltage value of power supply capacitor C1 output；One end of power supply capacitor C1 respectively with switching circuit 3 and
It controls chip 4 to connect, the other end ground connection of power supply capacitor C1, power supply capacitor C1 is that control chip 4 provides starting voltage.
Pass through the cooperative cooperating of above-mentioned each component part, the starting electricity of draw-out power supply provided by the embodiment of the utility model
Road obtains the operating voltage of start-up circuit by bleeder circuit from storage capacitor, thus by adjusting bleeder circuit, that is, adjustable
The operating voltage of section start-up circuit has simplified circuit structure without multiple start-up circuit units of connecting significantly, avoids circuit knot
The redundancy of structure realizes the low voltage starting of start-up circuit, withstanding voltage with higher, so that switching circuit is using commonly
The resistance to pressure request of circuit can be met lower than MOSFET switching tube, so that the start-up circuit has high reliablity, at low cost, volume
Small advantage.
It is carried out specifically below with reference to start-up circuit of the specific example to the draw-out power supply of the utility model embodiment
It is bright.
In a preferred embodiment, as shown in Fig. 2, above-mentioned bleeder circuit 1 includes: first resistor R1, second resistance R2,
Wherein, one end of first resistor R1 is connect with the forward end of storage capacitor Cin, and the other end of first resistor R1 is electric with second respectively
It hinders one end of R2, one end of clamp circuit 2 and switching circuit 3 to connect, the other end of second resistance R2 and bearing for storage capacitor Cin
It is grounded after to end connection.In practical applications, it is parallel with equalizing resistance at the both ends of storage capacitor Cin, it can be directly by energy storage
Equalizing resistance on capacitor Cin is substituted with above-mentioned first resistor R1 and second resistance R2, first resistor R1 and second resistance
The sum of resistance value of R2 is identical as the resistance value of former equalizing resistance, to realize the pressure stabilization function to storage capacitor Cin, while can basis
The high pressure resistant level requirement of practical start-up circuit adjusts the ratio of first resistor R1 and second resistance R2, in cooperation power initiation
Under the design premises of circuit, in order to reduce start-up circuit design difficulty, the ratio between first resistor R1 and the resistance value of second resistance R2 lead to
Often between 5-10.Resistance value is generally between a few k Ω to tens k Ω, so that the voltage value obtained from above-mentioned storage capacitor Cin
In the pressure-resistant range of switching circuit 3, the start-up circuit, under conditions of cooperating first resistor R1 and second resistance R2 no-load voltage ratio,
It can guarantee the working characteristics that low voltage starting and high pressure tolerance are still met in the case where high input voltage 0-10000V, in turn
Series multistage start-up circuit unit is avoided, circuit composition has been simplified, reduces the redundancy of circuit structure.It should be noted that
It in practical applications, can also be using other bleeder circuits 1, as long as the bleeder circuit 1 may be implemented from storage capacitor Cin
In the withstanding voltage range of the start-up circuit, the utility model is not limited thereto the voltage value of acquisition.
In a preferred embodiment, as shown in Fig. 2, above-mentioned start-up circuit further include: current-limiting circuit 5, current-limiting circuit 5
One end is connect with the output end of bleeder circuit 1, the other end of current-limiting circuit 5 respectively with one end of clamp circuit 2 and switching circuit 3
Connection, current-limiting circuit 5 are used to limit the electric current of clamp circuit 2.
In practical applications, as shown in Fig. 2, above-mentioned clamp circuit 2 specifically can be by upper including voltage-stabiliser tube ZD1
The reverse current of voltage-stabiliser tube ZD1 is limited in a microampere rank by the current-limiting circuit 5 stated, to ensure that voltage-stabiliser tube ZD1 can either be mentioned
For reliable pressure stabilizing value, and further decrease the power consumption of entire start-up circuit.Specifically, the current-limiting circuit 5 is by multiple concatenated
Current-limiting resistance R composition, it should be noted that in the utility model embodiment, above-mentioned clamp circuit 2 is with a voltage-stabiliser tube
The explanation carried out for ZD1, above-mentioned current-limiting circuit 5 is the explanation carried out by taking two concatenated current-limiting resistance R as an example, in reality
In, the voltage-stabiliser tube ZD1 in clamp circuit 2 can be set to two or more according to actual needs, above-mentioned limit
The number of leakage resistance R can be according to the current-limiting resistance R for needing to be arranged three or three or more of clamp circuit 2, the utility model
It is not limited thereto.Further, it is also possible to when starting by the resistance value that changes multiple series limiting resistor R to adjust draw-out power supply
Between, in practical applications, which can mention the starting time restriction of entire draw-out power supply within 1s, and then significantly
The high starting efficiency of draw-out power supply.
In preferably implementing one, as shown in Fig. 2, above-mentioned switching circuit 3 includes: switch mosfet pipe Q1,3rd resistor
R3 and the 4th resistance R4, wherein one end of 3rd resistor R3 is connect with the output end of bleeder circuit 1, and 3rd resistor R3's is another
End is connect with the drain electrode of switch mosfet pipe Q1；One end of 4th resistance R4 respectively with clamp circuit 2 and switch mosfet pipe Q1
Grid connection, the other end of the 4th resistance R4 respectively with the source electrode of one end of storage capacitor Cin and switch mosfet pipe Q1 connect
It connects.
Specifically, the first resistor R1 cooperation in above-mentioned 3rd resistor R3 and above-mentioned equalizer circuit realize it is above-mentioned
When switch mosfet pipe Q1 opening state, to the metering function of above-mentioned power supply capacitor C1 charging, above-mentioned voltage-stabiliser tube ZD1 is also used to
Limit switch mosfet pipe Q1 grid source electrode instantaneous voltage extreme value, it is ensured that the output voltage amplitude of power supply capacitor C1 is in control chip 4
Starting voltage threshold on.
In practical applications, above-mentioned switch mosfet pipe Q1 selects conventional stress levels device, and then reduces
The cost of entire circuit, the switch mosfet pipe Q1 are in amplification region working condition in start-up circuit working stage, that is, start
In the circuit course of work, the gate voltage of switch mosfet pipe Q1 is in and opens on threshold value, but does not reach and open completely
The conduction impedance of state, MOSFET is larger, its own high resistant also plays the role of current limliting well.The 4th above-mentioned resistance R4
Effect be to occur that electrostatic is accumulative to lead to MOSFET switching tube Q1 in order to avoid the grid of switch mosfet pipe Q1 and source electrode both ends
There is the phenomenon that misleads.
Specifically, in one embodiment, above-mentioned power supply capacitor C1 be control chip 4 from start-up circuit power to take can electricity
Source power supply provides the guarantee of supporting time, it is ensured that handoff procedure of the control chip 4 under above two state will not have the hiccups
Phenomenon causes the starting of power supply to fail.After control chip 4 receives the both ends power supply capacitor C1 supply voltage, start to start work,
Control 4 auxiliary power supply of chip starts working, and therefore the voltage for being higher than start-up circuit offer leads to switch mosfet pipe Q1
Grid source electrode between occur being similar to zero negative pressure so that switch mosfet pipe Q1 is turned off, start-up circuit exits work, and taking can electricity
The entire start-up course in source is completed.
The working principle of start-up circuit as shown in Figure 2 will be illustrated below:
Firstly, start-up circuit constitutes bleeder circuit 1 by first resistor R1 and second resistance R2, from input Support Capacitor
The voltage value of Uin × R1/ (R1+R2) is obtained on (storage capacitor Cin), wherein Uin is input voltage, when above-mentioned input voltage
When starting voltage lower than draw-out power supply, voltage-stabiliser tube ZD1 Clamping voltages in clamp circuit 2, draw-out power supply does not start.
Then, when the input voltage rising value of start-up circuit starts voltage, above-mentioned voltage-stabiliser tube ZD1 reverse breakdown is opened
Switch mosfet pipe Q1 conducting in powered-down road 3, power supply capacitor C1 charge to the starting voltage of draw-out power supply, and draw-out power supply opens
It is dynamic.
Finally, control 4 auxiliary power supply of chip starts working, and is higher than start-up circuit after draw-out power supply starts work
Therefore the voltage of offer leads to occur being similar to zero negative pressure, switch mosfet pipe between the grid source electrode of switch mosfet pipe Q1
Q1 shutdown, start-up circuit exit work, and the entire start-up course of draw-out power supply is completed, with the liter of the input voltage of start-up circuit
Height, bleeder circuit 1 share input pressure drop, always work in pressure-resistant range with the switch mosfet pipe Q1 ensured in switching circuit
It is interior.
By the cooperative cooperating of above-mentioned each component part, the start-up circuit of the draw-out power supply of the utility model embodiment,
The operating voltage of start-up circuit is obtained from storage capacitor by bleeder circuit, so that bleeder circuit is i.e. adjustable to be opened by adjusting
The operating voltage of dynamic circuit has simplified circuit structure significantly, has avoided circuit structure without multiple start-up circuit units of connecting
Redundancy, realizes the low voltage starting of start-up circuit, and withstanding voltage with higher is commonly lower than so that switching circuit utilizes
Switch mosfet pipe can meet the resistance to pressure request of circuit, so that the start-up circuit has high reliablity, at low cost, small in size excellent
Gesture.
Embodiment 2
The utility model embodiment provides a kind of draw-out power supply, as shown in figure 3, the draw-out power supply includes: control chip 4
And the start-up circuit 102 in embodiment 1, wherein the input terminal of start-up circuit 102 is connect with storage capacitor Cin, from storage capacitor
Cin obtains operating voltage；The output end of start-up circuit 102 is connect with control chip 4, provides starting voltage for control chip 4.It opens
The detailed content of dynamic circuit 102 is no longer repeated herein referring to the associated description in embodiment 1.
By the cooperative cooperating of above-mentioned each component part, the draw-out power supply of the utility model embodiment passes through starting electricity
The bleeder circuit on road obtains the operating voltage of start-up circuit from storage capacitor, so that bleeder circuit is i.e. adjustable to be opened by adjusting
The operating voltage of dynamic circuit has simplified circuit structure significantly, has avoided circuit structure without multiple start-up circuit units of connecting
Redundancy realizes the low voltage starting of start-up circuit, withstanding voltage with higher, so that the switching circuit of the start-up circuit
Using commonly the resistance to pressure request of circuit can be met lower than switch mosfet pipe, so that the draw-out power supply has high reliablity, cost
Advantage low, small in size.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (7)
1. a kind of start-up circuit of draw-out power supply characterized by comprising bleeder circuit (1), clamp circuit (2), switching circuit
(3), power supply capacitor (C1), wherein
The first input end of the bleeder circuit (1) is connect with the forward end of storage capacitor (Cin), the bleeder circuit (1)
Second input terminal is grounded after connecting with the negative end of the storage capacitor (Cin), the output end of the bleeder circuit (1) respectively with
One end of the clamp circuit (2) and the switching circuit (3) connection, the bleeder circuit (1) is from the storage capacitor (Cin)
The upper operating voltage for obtaining start-up circuit；
One end of the clamp circuit (2) is connect with the switching circuit (3), the other end ground connection of the clamp circuit (2), institute
State the voltage value that clamp circuit (2) limit power supply capacitor (C1) output；
One end of the power supply capacitor (C1) is connect with the switching circuit (3) and control chip (4) respectively, the power supply capacitor
(C1) other end ground connection, the power supply capacitor (C1) are that the control chip (4) provides starting voltage.
2. the start-up circuit of draw-out power supply according to claim 1, which is characterized in that the bleeder circuit (1) includes:
One resistance (R1), second resistance (R2), wherein
One end of the first resistor (R1) is connect with the forward end of the storage capacitor (Cin), the first resistor (R1)
The other end connects with one end of the second resistance (R2), one end of the clamp circuit (2) and the switching circuit (3) respectively
It connects, the other end of the second resistance (R2) is grounded after connecting with the negative end of the storage capacitor (Cin).
3. the start-up circuit of draw-out power supply according to claim 1, which is characterized in that further include:
One end of current-limiting circuit (5), the current-limiting circuit (5) is connect with the output end of the bleeder circuit (1), the current limliting electricity
The other end on road (5) is connect with one end of the clamp circuit (2) and the switching circuit (3) respectively, the current-limiting circuit (5)
For limiting the electric current of the clamp circuit (2).
4. the start-up circuit of draw-out power supply according to claim 3, which is characterized in that the current-limiting circuit (5) includes more
A concatenated current-limiting resistance (R).
5. the start-up circuit of draw-out power supply according to claim 1, which is characterized in that the clamp circuit (2) includes extremely
Few a voltage-stabiliser tube (ZD1).
6. the start-up circuit of draw-out power supply according to claim 1, which is characterized in that the switching circuit (3) includes:
Switch mosfet pipe (Q1), 3rd resistor (R3) and the 4th resistance (R4), wherein
One end of the 3rd resistor (R3) is connect with the output end of the bleeder circuit (1), the 3rd resistor (R3) it is another
One end is connect with the drain electrode of the switch mosfet pipe (Q1)；
One end of 4th resistance (R4) connects with the grid of the clamp circuit (2) and the switch mosfet pipe (Q1) respectively
Connect, the other end of the 4th resistance (R4) respectively with one end of the storage capacitor (Cin) and the switch mosfet pipe
(Q1) source electrode connection.
7. a kind of draw-out power supply characterized by comprising control chip (4) and starting as described in any one in claim 1-5
Circuit (102), wherein
The input terminal of the start-up circuit (102) is connect with storage capacitor (Cin), obtains work from the storage capacitor (Cin)
Voltage；
The output end of the start-up circuit (102) is connect with the control chip (4), provides starting for the control chip (4)
Voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920039144.6U CN209545430U (en) | 2019-01-09 | 2019-01-09 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920039144.6U CN209545430U (en) | 2019-01-09 | 2019-01-09 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209545430U true CN209545430U (en) | 2019-10-25 |
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ID=68269075
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920039144.6U Active CN209545430U (en) | 2019-01-09 | 2019-01-09 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
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| Country | Link |
|---|---|
| CN (1) | CN209545430U (en) |
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2019
- 2019-01-09 CN CN201920039144.6U patent/CN209545430U/en active Active
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