CN209419215U - Start-up circuit - Google Patents
Start-up circuit Download PDFInfo
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- CN209419215U CN209419215U CN201920187668.XU CN201920187668U CN209419215U CN 209419215 U CN209419215 U CN 209419215U CN 201920187668 U CN201920187668 U CN 201920187668U CN 209419215 U CN209419215 U CN 209419215U
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Abstract
The utility model provides a kind of start-up circuit, including input circuit, the first transistor, second transistor, central controller and third transistor.Input circuit receives the pulse width modulating signal of voltage input end transmission.The first transistor receives the pulse width modulating signal of input circuit transmission and is converted on state by off state.After second transistor receives the pulse width modulating signal of the first transistor transmission and is converted on state by off state.Equal voltage ends, which have, waits voltage signals.Wherein, when start-up circuit powers on, central controller adjusts the duty ratio of pulse width modulating signal according to the equal voltage signals of equal voltage ends and is sent to third transistor.Start-up circuit provided by the utility model, central controller can adjust the duty ratio of pulse width modulating signal according to equal voltage signals and be sent to third transistor, to prevent third transistor to be damaged when powering on.
Description
Technical field
The utility model relates to electronic circuit fields, in particular to a kind of start-up circuit.
Background technique
In general, electronic product may provide excessive when receiving the electric energy that external power supply provides because of external power supply
Voltage and cause part in electronic product to generate damage.Therefore, the part when powering in electronic product how is reduced to generate
Damage is to need to overcome the problems, such as.
Utility model content
In view of the above problems, the utility model provides a kind of start-up circuit, can effectively solve the problem that electronic component when powering on
Lead to the problem of damage.
To achieve the goals above, the utility model adopts the following technical solutions:
In a first aspect, the utility model provides a kind of start-up circuit, the start-up circuit includes:
Input circuit, the input circuit receive the pulse width modulating signal of voltage input end transmission；
The first transistor is electrically connected with the input circuit, and the first transistor receives the input circuit and passes
The pulse width modulating signal that send simultaneously is converted on state by off state；
Second transistor, and the first transistor and waits voltage ends to be electrically connected, and the second transistor receives institute
It is described to wait voltages after stating the pulse width modulating signal of the first transistor transmission and being converted on state by off state
End, which has, waits voltage signals；
Central controller is electrically connected with the second transistor, the voltage input end and the voltage ends such as described；
Third transistor is electrically connected with the central controller, and the voltage input end is electrically connected at described the
Between three transistors and the central controller, wherein when the start-up circuit powers on, the central controller is according to
The duty ratio for waiting voltage signals adjustment pulse width modulating signal of equal voltage ends is simultaneously sent to the third transistor.
As an alternative embodiment, when the equal voltage signals for waiting voltage ends are higher than preset threshold,
The central controller reduces the duty ratio of pulse width modulating signal and is sent to the third transistor.
As an alternative embodiment, when the equal voltage signals for waiting voltage ends are lower than preset threshold,
The central controller promotes the duty ratio of pulse width modulating signal and is sent to the third transistor.
As an alternative embodiment, the input circuit includes:
First diode, one end and the voltage input end are electrically connected；
The other end of first resistor, one end and the first diode is electrically connected；
The other end of capacitor, one end ground connection, the other end and the first resistor is electrically connected, and the capacitor is used for energy storage；
The other end of second resistance, one end and the capacitor and the other end of the first resistor are electrically connected.
As an alternative embodiment, the first transistor is NPN type triode, there is emitter-base bandgap grading, base stage and collection
The base stage of pole, the emitter grounding of the first transistor, the first transistor is electrically connected the input circuit.
As an alternative embodiment, the second transistor is PNP type triode, there is emitter-base bandgap grading, base stage and collection
Pole, the base stage of the second transistor are electrically connected the collector of the first transistor, and the collector of the second transistor is electrical
It connects the voltage ends such as described and is used to provide the described equal voltage signals.
As an alternative embodiment, the start-up circuit further include:
The emitter-base bandgap grading of 3rd resistor, one end and the second transistor is electrically connected；
The other end of 4th resistance, one end and the 3rd resistor and the first pin of central controller are electrically connected；
Voltage-stablizer, one end ground connection, the second pin electricity of the other end and central controller of the other end and the 4th resistance
Property connection.
As an alternative embodiment, the voltage-stablizer is Zener diode.
As an alternative embodiment, the third pin of central controller is electrically connected with the equal voltage ends.
As an alternative embodiment, the third transistor is N-type MOS triode, there is gate, drain electrode and source
Pole, the start-up circuit further include:
4th pin of the 5th resistance, one end and central controller and the voltage input end are electrically connected；
4th pin of the 6th resistance, one end and the central controller, one end of the 5th resistance and the voltage
Input terminal is electrically connected；
The other end of second diode, one end and the 5th resistance is electrically connected；
The other end electricity of the other end and second diode of the gate of the third transistor and the 6th resistance
Property connection, the source electrode ground connection of the third transistor, the drain electrode of the third transistor is electrically connected voltage source.
Provide a kind of start-up circuit according to the utility model, including input circuit, the first transistor, second transistor,
Central controller and third transistor.Input circuit receives the pulse width modulating signal of voltage input end transmission.First crystal
Pipe receives the pulse width modulating signal of input circuit transmission and is converted on state by off state.Second transistor receives
The pulse width modulating signal of the first transistor transmission and after being converted on state by off state.Equal voltage ends, which have, waits electricity
Press signal.Wherein, when start-up circuit powers on, central controller is according to the equal voltage signals adjustment pulse width tune of equal voltage ends
The duty ratio of signal processed is simultaneously sent to third transistor.Start-up circuit provided by the utility model, central controller can bases
The duty ratio of equal voltage signals adjustment pulse width modulating signal is simultaneously sent to third transistor, to prevent third transistor upper
It is damaged when electric, increases safety.In addition, being increased by the voltage level of the pressure sides such as the clamper function control of Zener diode
Add accuracy.In general, the capacitor of input circuit has energy-storage function, and the pulse that can be transmitted to avoid voltage input end is wide
Spending modulated signal, there is a situation where voltage instabilities.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to the scope of the utility model as.
Fig. 1 is the schematic block diagram for the start-up circuit that the utility model embodiment 1 provides；
Fig. 2 is the schematic circuit for the start-up circuit that the utility model embodiment 2 provides.
Main element symbol description:
100,200 start-up circuit；
110- input circuit；
120- the first transistor；
130- second transistor；
140- central controller；
150- third transistor；
D1- first diode；
R1- first resistor；
C- capacitor；
Q1-NPN type triode；
Q2-PNP type triode；
R3- 3rd resistor；
The 4th resistance of R4-；
Z- voltage-stablizer；
The 5th resistance of R5-；
The 6th resistance of R6-；
The second diode of D2-；
VIE- voltage input end；
The voltage ends such as EVE-.
Specific embodiment
The embodiments of the present invention are described below in detail, in which the same or similar labels are throughly indicated identical or
Similar element or element with the same or similar functions.
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole realities
Apply example.The component of the utility model embodiment being usually described and illustrated herein in the accompanying drawings can be come with a variety of different configurations
Arrangement and design.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below
The range of claimed invention, but it is merely representative of the selected embodiment of the utility model.Based on the utility model
Embodiment, those skilled in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
Embodiment 1
Referring to Fig. 1, Fig. 1 is the schematic block diagram for the start-up circuit that the utility model embodiment 1 provides.Start-up circuit
100 include input circuit 110, the first transistor 120, second transistor 130, central controller 140 and third transistor 150.
Furthermore, it is understood that the first transistor 120 and input circuit 110 are electrically connected.Second transistor 130 and the first crystalline substance
Body pipe 120 and wait voltage ends EVE be electrically connected.Central controller 140 and second transistor 130 and voltage ends EVE is waited electrically to connect
It connects.Third transistor 150 and central controller 140 are electrically connected.For example, central controller 140 can be central processing unit
(CPU, center processor unit), including multiple pins, each pin is used for receiving and transmitting signal, for example, central controller
140, which can be used for controlling led driving circuit, sends output signal to control its dimming function (adjustment brightness or color).
In one embodiment, input circuit 110 receives the pulse width modulating signal PWM1 of voltage input end VIE transmission.
For example, voltage input end VIE can receive the pulse width modulating signal PWM1 of power supply unit transmission.Pulse width is modulated
A kind of analog control mode modulates the base stage of BJT transistor or the grid of MOS transistor according to the variation of respective loads, with
It realizes the change of transistor or MOS pipe turn-on time, and then adjusts switching power supply output.The first transistor 120 receives defeated
After the pulse width modulating signal PWM1 for entering the transmission of circuit 110, the first transistor 120 is converted on state by off state,
For example, the voltage level of pulse width modulating signal PWM1 is greater than V when the first transistor 120 is BJT transistorBE, when first
When transistor 120 is MOS transistor, the voltage level of pulse width modulating signal PWM1 is greater than VGS。
In one embodiment, after voltage input end VIE triggering the first transistor 120 is connected, then, second transistor
It is defeated after 130 receive the pulse width modulating signal PWM1 that the first transistors 120 transmit and are converted on state by off state
Enter circuit 110, the first transistor 120, second transistor 130 and voltage ends EVE is waited to form access, voltage ends EVE is waited to have etc.
Voltage signal CS.In Fig. 1, waits voltage ends EVE that second transistor 130 and central controller 140 is electrically connected, provide
Wait voltage signals CS to central controller 140.
In one embodiment, voltage input end VIE is electrically connected between third transistor 150 and central controller 140,
Wherein, when start-up circuit 100 powers on, voltage input end VIE transfer pulse bandwidth modulation signals PWM1, then, center control
Device 140 according to the duty ratio of the equal voltage signals CS adjustment pulse width modulating signal PWM1 of equal voltage ends EVE transmission, control by center
Pulse width modulating signal PWM1 after adjusting duty ratio is sent to third transistor 150 by device 140 processed, effectively to avoid third
Transistor 150 is damaged when powering on because overtension and/or electric current are excessively high, and effectively maintenance is electrically safe.
In one embodiment, when the equal voltage signals CS of equal voltage ends EVE is higher than preset threshold, central controller 140
It reduces the duty ratio of pulse width modulating signal PWM1 and is sent to third transistor 150.For example, when equal voltage ends EVE etc.
The voltage level of voltage signal CS (is considered as preset threshold) when being higher than 5V, and central controller 140 controls pulse width modulating signal
The duty ratio of PWM1 is reduced to 30% by 70%, and central controller 140 is by the pulse width modulating signal after controlling duty ratio
PWM1 is sent to third transistor 150.Effectively third transistor 150 is avoided to damage.
In one embodiment, when the equal voltage signals CS of equal voltage ends EVE is lower than preset threshold, central controller 140
It promotes the duty ratio of pulse width modulating signal PWM1 and is sent to third transistor 150.For example, when equal voltage ends EVE etc.
The voltage level of voltage signal CS (is considered as preset threshold) when being lower than 2V, at this point, third transistor 150 can not be connected.Center control
The duty ratio that device 140 processed controls pulse width modulating signal PWM1 is promoted to 80% by 20%, and central controller 140 accounts for control
Pulse width modulating signal PWM1 after sky ratio is sent to third transistor 150, with the starting of adaptability to third transistor
150。
Embodiment 2
Referring to Fig. 2, Fig. 2 is the schematic circuit for the start-up circuit that the utility model embodiment 2 provides.Start-up circuit
200 include input circuit 110, the first transistor 120, second transistor 130,3rd resistor R3, the 4th resistance R4, voltage-stablizer Z,
5th resistance R5, the 6th resistance R6, the second diode D2, central controller 140 and third transistor 150.
Furthermore, it is understood that input circuit 110 includes first diode D1, first resistor R1, capacitor C and second resistance R2.
One end of first diode D1 and voltage input end VIE are electrically connected, for example, first diode D1 is to provide fixed pressure drop (example
Such as 0.4-0.5V), when voltage input end VIE provides additional forward voltage, in the start-up portion of forward characteristic, forward voltage is very
It is small, it is not enough to overcome the barrier effect of PN junction internal electric field, forward current is almost nil.When forward voltage be greater than conducting voltage with
Afterwards, PN junction internal electric field is overcome, diode forward conducting.
One end of first resistor R1 and the other end of first diode D1 are electrically connected.One end of capacitor C is grounded.Capacitor C
The other end and first resistor R1 the other end be electrically connected, capacitor C be used for energy storage, in the power up of start-up circuit 200,
Can to avoid voltage input end VIE transmit pulse width modulating signal there is a situation where voltage instabilities.The one of second resistance R2
End is electrically connected with the other end of capacitor C and the other end of first resistor R1.
In one embodiment, the first transistor 120 is NPN type triode Q1, and NPN type triode is by three semiconductor structures
At two of them N-type and a P-type semiconductor composition, P-type semiconductor is in centre, and two pieces of N-type semiconductors are in two sides.It is main
Function is Current amplifier and on-off action.The first transistor 120 has emitter-base bandgap grading, base stage and collector.The emitter-base bandgap grading of the first transistor 120
Ground connection.The base stage of the first transistor 120 is electrically connected input circuit 110.It is exactly electric current that NPN type triode, which has an important parameter,
Magnificationfactorβ.When adding a small electric current in the base stage of NPN type triode, available one is note on collector
Enter the electric current of current beta times, i.e. collector current.Collector current changes with the variation of base current.
In one embodiment, second transistor 130 is PNP type triode Q2, and PNP type triode is partly led by two p-types
Triode composed by one N-type semiconductor of body sandwich.Second transistor 130 has emitter-base bandgap grading, base stage and collector, positive-negative-positive
The emitter potential highest of triode, collection electrode potential are minimum.The base stage of second transistor 130 is electrically connected the first transistor 120
Collector, voltage ends EVE is for voltage signals CS such as offers for collector electric connection of second transistor 130 etc..Work as start-up circuit
After 200 power on, voltage ends EVE, second transistor 130, the first transistor 120, second resistance R2, first resistor R1 and are waited
One diode D1 forms access.
In one embodiment, the emitter-base bandgap grading of one end of 3rd resistor R3 and second transistor 130 is electrically connected, 3rd resistor R3
One end provide conducting voltage to second transistor 130 emitter-base bandgap grading it is connected.One end of 4th resistance R4 and 3rd resistor R3
The other end and central controller 140 the first pin PIN1 be electrically connected.One end of voltage-stablizer Z is grounded.Voltage-stablizer Z's is another
The second pin PIN2 of the other end and central controller 140 of one end and the 4th resistance R4 is electrically connected.Voltage-stablizer Z is Zener two
Pole pipe.Zener diode is called Zener diode (Zener diode).Using PN reverse breakdown state, electric current can be very big
The phenomenon that variation in range and voltage are basically unchanged, the diode of manufactured pressure stabilization function.Zener diode be it is a kind of until
All there is very high-resistance semiconductor devices before critical breakdown reverse voltage.The third pin PIN3 of central controller 140 with etc.
Voltage end EVE is electrically connected.
Third transistor 150 is N-type MOS triode, and NMOS integrated circuit is N-channel MOS circuit, NMOS integrated circuit
Input impedance it is very high.N-type MOS triode has gate, drain electrode and source electrode.One end of 5th resistance R5 and central controller
140 the 4th pin PIN4 and voltage input end VIE is electrically connected.The of one end of 6th resistance R6 and central controller 140
Four pin PIN4, one end of the 5th resistance R5 and voltage input end VIE are electrically connected.One end of second diode D2 and the 5th electricity
The other end for hindering R5 is electrically connected.The other end and the second diode D2 of the gate of third transistor 150 and the 6th resistance R6
The other end is electrically connected, and the source electrode ground connection of third transistor 150, the drain electrode of third transistor 150 is electrically connected voltage source.
By above-mentioned, the utility model provides a kind of start-up circuit, including input circuit, the first transistor, the second crystal
Pipe, central controller and third transistor.Input circuit receives the pulse width modulating signal of voltage input end transmission.First is brilliant
Body pipe receives the pulse width modulating signal of input circuit transmission and is converted on state by off state.Second transistor connects
After receiving the pulse width modulating signal of the first transistor transmission and being converted on state by off state.Equal voltage ends have etc.
Voltage signal.Wherein, when start-up circuit powers on, central controller is according to the equal voltage signals adjustment pulse widths of equal voltage ends
The duty ratio of modulated signal is simultaneously sent to third transistor.Start-up circuit provided by the utility model, central controller can roots
The duty ratio of pulse width modulating signal is adjusted according to equal voltage signals and is sent to third transistor, to prevent third transistor from existing
It is damaged when powering on, increases safety.In addition, by the voltage level of the pressure sides such as the clamper function control of Zener diode,
Increase accuracy.In general, the capacitor of input circuit has energy-storage function, the pulse that can be transmitted to avoid voltage input end
There is a situation where voltage instabilities for bandwidth modulation signals.In addition, being controlled by the 4th pin of central controller according to equipotential signal
The duty ratio of the pulse width modulating signal of third transistor is sent to prevent it from damaging, increases Electrical Safety.
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, above in conjunction with the utility model
Attached drawing in embodiment clearly and completely describes the technical scheme in the embodiment of the utility model, it is clear that retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, the above detailed description to the embodiments of the present invention provided in the accompanying drawings is not intended to limit requirement
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
Claims (10)
1. a kind of start-up circuit, which is characterized in that the start-up circuit includes:
Input circuit, the input circuit receive the pulse width modulating signal of voltage input end transmission；
The first transistor is electrically connected with the input circuit, and the first transistor receives the input circuit transmission
The pulse width modulating signal is simultaneously converted on state by off state；
Second transistor, and the first transistor and waits voltage ends to be electrically connected, and the second transistor receives described the
The pulse width modulating signal of one transistor transmission and after being converted on state by off state, the equal voltage ends tool
There are equal voltage signals；
Central controller is electrically connected with the second transistor and the equal voltage ends；
Third transistor is electrically connected with the central controller, and it is brilliant that the voltage input end is electrically connected at the third
Between body pipe and the central controller, wherein when the start-up circuit powers on, the central controller is according to the equal electricity
The duty ratio of the equal voltage signals adjustment pulse width modulating signal of pressure side is simultaneously sent to the third transistor.
2. start-up circuit according to claim 1, which is characterized in that described when the equal voltage ends waits voltage signals high
When preset threshold, the central controller reduces the duty ratio of pulse width modulating signal and is sent to the third crystal
Pipe.
3. start-up circuit according to claim 1, which is characterized in that described when the equal voltage ends waits voltage signals low
When preset threshold, the central controller promotes the duty ratio of pulse width modulating signal and is sent to the third crystal
Pipe.
4. start-up circuit according to claim 1, which is characterized in that the input circuit includes:
First diode, one end and the voltage input end are electrically connected；
The other end of first resistor, one end and the first diode is electrically connected；
The other end of capacitor, one end ground connection, the other end and the first resistor is electrically connected, and the capacitor is used for energy storage；
The other end of second resistance, one end and the capacitor and the other end of the first resistor are electrically connected.
5. start-up circuit according to claim 1, which is characterized in that the first transistor is NPN type triode, is had
The base stage of emitter-base bandgap grading, base stage and collector, the emitter grounding of the first transistor, the first transistor is electrically connected the input
Circuit.
6. start-up circuit according to claim 5, which is characterized in that the second transistor is PNP type triode, is had
Emitter-base bandgap grading, base stage and collector, the base stage of the second transistor are electrically connected the collector of the first transistor, second crystal
The collector electric connection of the pipe equal voltage ends are used to provide the described equal voltage signals.
7. start-up circuit according to claim 6, which is characterized in that the start-up circuit further include:
The emitter-base bandgap grading of 3rd resistor, one end and the second transistor is electrically connected；
The other end of 4th resistance, one end and the 3rd resistor and the first pin of central controller are electrically connected；
Voltage-stablizer, one end ground connection, the other end electrically connect with the other end of the 4th resistance and the second pin of central controller
It connects.
8. start-up circuit according to claim 7, which is characterized in that the voltage-stablizer is Zener diode.
9. start-up circuit according to claim 1, which is characterized in that the third pin of central controller and the equal voltages
End is electrically connected.
10. start-up circuit according to claim 1, which is characterized in that the third transistor is N-type MOS triode, tool
There are gate, drain electrode and source electrode, the start-up circuit further include:
4th pin of the 5th resistance, one end and central controller and the voltage input end are electrically connected；
4th pin of the 6th resistance, one end and the central controller, one end of the 5th resistance and the voltage input
End is electrically connected；
The other end of second diode, one end and the 5th resistance is electrically connected；
The gate of the third transistor electrically connects with the other end of the 6th resistance and the other end of second diode
It connects, the source electrode ground connection of the third transistor, the drain electrode of the third transistor is electrically connected voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920187668.XU CN209419215U (en) | 2019-02-02 | 2019-02-02 | Start-up circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920187668.XU CN209419215U (en) | 2019-02-02 | 2019-02-02 | Start-up circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209419215U true CN209419215U (en) | 2019-09-20 |
Family
ID=67944536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920187668.XU Active CN209419215U (en) | 2019-02-02 | 2019-02-02 | Start-up circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209419215U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687421A (en) * | 2019-02-02 | 2019-04-26 | 深圳莱福德科技股份有限公司 | Start-up circuit |
-
2019
- 2019-02-02 CN CN201920187668.XU patent/CN209419215U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687421A (en) * | 2019-02-02 | 2019-04-26 | 深圳莱福德科技股份有限公司 | Start-up circuit |
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Effective date of registration: 20191226 Address after: 620000 Renshou Economic Development Zone, Renshou County, Sichuan, Meishan Patentee after: Sichuan Ledfriend Technology Co., Ltd. Address before: 518000 Floor 1-3 of Block B, 26 Xinhe Avenue, Xinqiao Street, Baoan District, Shenzhen City, Guangdong Province (Block F, Kutuozi Cloud Builder Industrial Park, Floor 1-3) Patentee before: Shenzhen Leiford Technology Co., Ltd. |