CN209345121U - Signal control circuit and Switching Power Supply - Google Patents
Signal control circuit and Switching Power Supply Download PDFInfo
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- CN209345121U CN209345121U CN201821775603.9U CN201821775603U CN209345121U CN 209345121 U CN209345121 U CN 209345121U CN 201821775603 U CN201821775603 U CN 201821775603U CN 209345121 U CN209345121 U CN 209345121U
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Abstract
The utility model relates to a kind of signal control circuit and Switching Power Supplies, wherein, the Switching Power Supply can have prime output end and rear class output end, which may include the first triode Q1, first diode D1, third transistor Q3, accessory power supply VCC, the 5th resistance R5, first node A and the 7th resistance R7.In signal control circuit, by the way that the 7th resistance R7 is connected between first node A and the base stage of third transistor Q3, this allows for being greater than the breakdown voltage of third transistor Q3 even if the maximum conduction voltage drop of first diode D1, also the voltage pull-down of the base stage of third transistor Q3 can will be input to by the 7th resistance R7, third transistor Q3 is operating normally, ensure that the accuracy of signal control.
Description
Technical field
The utility model relates to Switching Power Supplies to protect field, more particularly to a kind of signal control circuit and Switching Power Supply.
Background technique
Switching Power Supply has many advantages, such as high-efficient, small in size, light-weight, is common in industrial automation control appliance, military project
In equipment, LED illumination device.
In traditional signal control circuit applied to Switching Power Supply, component is easy because of operating temperature and itself device
The factors such as part characteristic and the variation for generating electrology characteristic, to will affect the precision of signal control.
Utility model content
Based on this, it is necessary to a kind of signal control circuit and Switching Power Supply are provided, to improve the precision of signal control.
A kind of signal control circuit, be applied to Switching Power Supply, the first switch power supply include prime signal output end and
Rear class signal output end；The signal control circuit include: the first triode Q1, first diode D1, third transistor Q3,
Accessory power supply VCC, the 5th resistance R5, first node A and the 7th resistance R7；
Wherein, the prime signal output end is connected to the base stage of the first triode Q1；The first triode Q1
Collector connect with the cathode of the first diode D1；The anode of the first diode D1 and the first node A connect
It connects；The accessory power supply VCC passes through the 5th resistance R5, first node A and the 7th resistance R7 being sequentially connected in series and is connected to institute
The base stage of third transistor Q3 is stated, the collector of the third transistor Q3 is connect with the rear class signal output end；Described
The emitter of the emitter of one triode Q1 and the third transistor Q3 are connected to ground wire GND；And
When the prime signal output end exports high level signal, the resistance R7 is for making the first node A's
Voltage is less than the breakdown voltage of the third transistor Q3.
The prime signal output end includes the first prime signal output end and the second prime in one of the embodiments,
Signal output end；The signal control circuit further includes the second triode Q2 and the second diode D2；
Wherein, the first prime signal output end is connected to the base stage of the first triode Q1；Second prime
Signal output end is connected to the base stage of the second triode Q2；The emitter of the second triode Q2 is connected to the ground wire
GND；The collector of the second triode Q2 is connect with the cathode of the second diode D2；The second diode D2's
Anode is connected to the first node A；And
In the first prime signal output end and/or the second prime signal output end output high level signal,
The breakdown voltage that the resistance R7 is used to make the voltage of the first node A to be less than the third transistor Q3.
The signal control circuit further includes 3rd resistor R3 in one of the embodiments,；
Wherein, the second prime signal output end and the 3rd resistor R3 are connected serially to the second triode Q2's
Base stage.
The signal control circuit further includes the 4th resistance R4 and the second capacitor C2 in one of the embodiments,；
Wherein, one end of the 4th resistance R4 be connected to the 3rd resistor R3 and the second triode Q2 base stage it
Between circuit on, the other end is connected to the ground wire GND；One end of the second capacitor C2 be connected to the 3rd resistor R3 with
On circuit between the base stage of the second triode Q2, the other end is connected to the ground wire GND.
The signal control circuit further includes first resistor R1 in one of the embodiments,；
Wherein, the first prime signal output end and the first resistor R1 are connected serially to the base stage of the first triode Q1.
The signal control circuit further includes second resistance R2 and first capacitor C1 in one of the embodiments,；
Wherein, one end of the second resistance R2 be connected to the first resistor R1 and the first triode Q1 base stage it
Between circuit on, the other end is connected to the ground wire GND；One end of the first capacitor C1 be connected to the first resistor R1 with
On circuit between the base stage of the first triode Q1, the other end is connected to the ground wire GND.
The signal control circuit further includes the 6th resistance R6 and third capacitor C3 in one of the embodiments,；
Wherein, one end of the 6th resistance R6 is connected to the base of the 7th resistance R7 and the third transistor Q3
On circuit between pole, the other end is connected to the ground wire GND；One end of the third capacitor C3 is connected to the 7th resistance
On circuit between R7 and the base stage of the third transistor Q3, the other end is connected to the ground wire GND.
The output voltage of the accessory power supply is more than or equal to 12V in one of the embodiments,.
The resistance value of the 5th resistance R5 is more than or equal to 10k Ω in one of the embodiments,；The 6th resistance R6's
Resistance value is more than or equal to 10k Ω；The resistance value of the 7th resistance R7 is more than or equal to 10k Ω.
A kind of Switching Power Supply, including prime signal output end and rear class signal output end；And
Above-mentioned signal control circuit is connect with the prime signal output end and rear class signal output end respectively.
In above-mentioned signal control circuit, by the way that the 7th resistance R7 is connected on first node A's and third transistor Q3
Between base stage, this allows for being greater than the breakdown voltage of third transistor Q3 even if the maximum conduction voltage drop of first diode D1,
The voltage pull-down of the base stage of third transistor Q3 can will be input to by the 7th resistance R7, enable third transistor Q3 just
Often movement ensure that the accuracy of signal control.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of signal control circuit in one embodiment.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 is the structural schematic diagram of signal control circuit in one embodiment.As described in Figure 1, the present embodiment provides one kind
Signal control circuit, the signal control circuit can be used in Switching Power Supply.Wherein, which can have prime
Output end and rear class output end, the signal control circuit may include the first triode Q1, first diode D1, third transistor
Q3, accessory power supply VCC, the 5th resistance R5, first node A and the 7th resistance R7.
Specifically, please continue to refer to Fig. 1, prime signal output end be can connect to the base stage of the first triode Q1；First
The collector of triode Q1 can be connect with the cathode of the first diode D1；The anode of first diode D1 can be with first
Node A connection；Accessory power supply VCC can be connected to by the 5th resistance R5, first node A and the 7th resistance R7 being sequentially connected in series
The collector of the base stage of third transistor Q3, third transistor Q3 can be connect with rear class signal output end；First triode Q1
Emitter and the emitter of third transistor Q3 can connect to ground wire GND.
Prime signal output end can control the output of rear class signal output end.When outer signals are normal, prime signal
Output end can export a low level to the first triode Q1, at this time due to being low level therefore the first triode Q1 does not work,
The collector of first triode Q1 is high-impedance state over the ground.Accessory power supply VCC can give third transistor Q3 by the 5th resistance R5
Base stage provide voltage so that third transistor Q3 is breakdown, namely the collector of third transistor Q3 is made over the ground to be low-resistance
State.And when outer signals exception, prime signal output end can export the base stage of high level to the first triode Q1, make
The first triode Q1 is breakdown namely the collector of the first triode Q1 is low resistance state over the ground.At this point, first diode D1
The base voltage of third transistor Q3 can be dragged down so that the collector of third transistor Q3 over the ground between become high-impedance state.
However, in the conventional technology, when outer signals exception, if (such as operating temperature factor) under certain conditions
The maximum conduction voltage drop of one diode D1 is greater than the breakdown voltage of third transistor Q3, will make even if prime signal output end
Output is high level, and third transistor Q3 still can be breakdown, so that signal control failure.In order to be explained in detail, no
Harm assumes that the maximum conduction voltage drop of first diode D1 may become 0.8V since temperature influences, and third transistor Q3 at this time
Breakdown voltage be 0.7V, when outer signals exception, due to breakdown voltage 0.7V < first diode D1 of third transistor Q3
Maximum conduction voltage drop 0.8V, at this time should should not be breakdown third transistor Q3 it is still breakdown so that signal control lose
Effect.
And in signal control circuit provided by the utility model, by the way that the 7th resistance R7 is connected on first node A
Between the base stage of third transistor Q3, this allows for being greater than third transistor even if the maximum conduction voltage drop of first diode D1
The breakdown voltage of Q3 can will also be input to the voltage pull-down of the base stage of third transistor Q3 by the 7th resistance R7, so that the
Three triode Q3 can be operating normally, and ensure that the accuracy of signal control.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, prime signal
Output end can also include the first prime signal output end and the second prime signal output end；Signal control circuit can also include
Second triode Q2 and the second diode D2.Wherein, the first prime signal output end can connect to the first triode Q1
Base stage；Second prime signal output end can connect to the base stage of the second triode Q2；The emitter of second triode Q2 can
To be connected to ground wire GND；The collector of second triode Q2 can be connect with the cathode of the second diode D2；Second diode D2
Anode can connect to first node A.In the present embodiment, it is exported in the first prime signal output end and the second prime signal
In end any one output high level signal when, the voltage of first node A can become first diode D1 or the two or two pole
The conduction voltage drop of pipe D2, and make after being acted on by the 7th resistance R7 the collector of third transistor Q3 over the ground between become high
Resistance state.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, signal control
Circuit can also include 3rd resistor R3；Second prime signal output end can be connected serially to the second triode with 3rd resistor R3
The base stage of Q2.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, signal control
Circuit can also include the 4th resistance R4 and the second capacitor C2；Wherein, one end of the 4th resistance R4 can connect to 3rd resistor
On circuit between R3 and the base stage of the second triode Q2, the other end can be connect with ground wire GND；Further, the second capacitor
One end of C2 can connect to the circuit between 3rd resistor R3 and the base stage of the second triode Q2, and the second capacitor C2's is another
End can be connect with ground wire GND.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, signal control
Circuit further includes first resistor R1；Wherein, the first prime signal output end can be connected serially to the first triode with first resistor R1
The base stage of Q1.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, signal control
Circuit can also include second resistance R2 and first capacitor C1；Wherein, one end of second resistance R2 can connect to first resistor
On circuit between R1 and the base stage of the first triode Q1, the other end be can connect to ground wire GND；One end of first capacitor C1 can
With on the circuit that is connected between first resistor R1 and the base stage of the first triode Q1, the other end of first capacitor C1 can connect
It is connected to ground wire GND.
Please continue to refer to Fig. 1, based on the above embodiment in signal control circuit, in one embodiment, signal control
Circuit can also include the 6th resistance R6 and third capacitor C3；Wherein, one end of the 6th resistance R6 can connect to the 7th resistance
On circuit between R7 and the base stage of third transistor Q3, the other end be can connect to ground wire GND；One end of third capacitor C3 can
With on the circuit that is connected between the 7th resistance R7 and the base stage of third transistor Q3, the other end of third capacitor C3 can connect
It is connected to ground wire GND.
In one embodiment, the output voltage of accessory power supply can be more than or equal to 12V, to guarantee signal control circuit
It works normally.In other embodiments, the resistance value of the 5th resistance R5 can be more than or equal to 10k Ω；The resistance value of 6th resistance R6 can
To be more than or equal to 10k Ω；The resistance value of 7th resistance R7 can be more than or equal to 10k Ω, to guarantee defeated in prime signal output end
Out when high level, the collector of third transistor Q3 can keep high-impedance state over the ground.
The present embodiment provides a kind of Switching Power Supply, which may include that prime signal output end and rear class signal are defeated
Outlet；And signal control circuit, the signal control circuit can be defeated with the prime signal output end and rear class signal respectively
Outlet connection.The signal control circuit may include: the first triode Q1, first diode D1, third transistor Q3, auxiliary electricity
Source VCC, the 5th resistance R5, first node A and the 7th resistance R7；Wherein, prime signal output end is connected to the first triode Q1
Base stage；The collector of first triode Q1 is connect with the cathode of first diode D1；The anode of first diode D1 and first
Node A connection；Accessory power supply VCC passes through the 5th resistance R5, the first node A that are sequentially connected in series and the 7th resistance R7 is connected to the
The collector of the base stage of three triode Q3, third transistor Q3 is connect with rear class signal output end；The transmitting of first triode Q1
The emitter of pole and third transistor Q3 are connected to ground wire GND；And when prime signal output end exports high level signal, electricity
The breakdown voltage that resistance R7 is used to make the voltage of first node A to be less than third transistor Q3.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
Above-described embodiments merely represent several embodiments of the utility model, the description thereof is more specific and detailed,
But it cannot be understood as the limitations to utility model patent range.It should be pointed out that for the common skill of this field
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of signal control circuit, which is characterized in that be applied to Switching Power Supply, the Switching Power Supply includes the output of prime signal
End and rear class signal output end；The signal control circuit includes: the first triode Q1, first diode D1, third transistor
Q3, accessory power supply VCC, the 5th resistance R5, first node A and the 7th resistance R7；
Wherein, the prime signal output end is connected to the base stage of the first triode Q1；The collection of the first triode Q1
Electrode is connect with the cathode of the first diode D1；The anode of the first diode D1 is connect with the first node A；Institute
It states accessory power supply VCC and the third is connected to by the 5th resistance R5, first node A and the 7th resistance R7 being sequentially connected in series
The base stage of triode Q3, the collector of the third transistor Q3 are connect with the rear class signal output end；One or three pole
The emitter of the emitter of pipe Q1 and the third transistor Q3 are connected to ground wire GND；And
When the prime signal output end exports high level signal, the resistance R7 is used to make the voltage of the first node A
Less than the breakdown voltage of the third transistor Q3.
2. signal control circuit according to claim 1, which is characterized in that the prime signal output end include first before
Grade signal output end and the second prime signal output end；The signal control circuit further includes the second triode Q2 and the two or two pole
Pipe D2；
Wherein, the first prime signal output end is connected to the base stage of the first triode Q1；The second prime signal
Output end is connected to the base stage of the second triode Q2；The emitter of the second triode Q2 is connected to the ground wire GND；
The collector of the second triode Q2 is connect with the cathode of the second diode D2；The anode of the second diode D2 connects
It is connected to the first node A.
3. signal control circuit according to claim 2, which is characterized in that the signal control circuit further includes third electricity
Hinder R3；
Wherein, the second prime signal output end and the 3rd resistor R3 are connected serially to the base stage of the second triode Q2.
4. signal control circuit according to claim 3, which is characterized in that the signal control circuit further includes the 4th electricity
Hinder R4 and the second capacitor C2；
Wherein, one end of the 4th resistance R4 is connected to the electricity between the 3rd resistor R3 and the base stage of the second triode Q2
On the road, the other end is connected to the ground wire GND；One end of the second capacitor C2 is connected to the 3rd resistor R3 and described the
On circuit between the base stage of two triode Q2, the other end is connected to the ground wire GND.
5. according to signal control circuit described in claim 2 to 4 any one, which is characterized in that the signal control circuit
It further include first resistor R1；
Wherein, the first prime signal output end and the first resistor R1 are connected serially to the base stage of the first triode Q1.
6. signal control circuit according to claim 5, which is characterized in that the signal control circuit further includes the second electricity
Hinder R2 and first capacitor C1；
Wherein, one end of the second resistance R2 is connected to the electricity between the first resistor R1 and the base stage of the first triode Q1
On the road, the other end is connected to the ground wire GND；One end of the first capacitor C1 is connected to the first resistor R1 and described the
On circuit between the base stage of one triode Q1, the other end is connected to the ground wire GND.
7. signal control circuit according to claim 1, which is characterized in that the signal control circuit further includes the 6th electricity
Hinder R6 and third capacitor C3；
Wherein, one end of the 6th resistance R6 is connected between the 7th resistance R7 and the base stage of the third transistor Q3
Circuit on, the other end is connected to the ground wire GND；One end of the third capacitor C3 is connected to the 7th resistance R7 and institute
It states on the circuit between the base stage of third transistor Q3, the other end is connected to the ground wire GND.
8. signal control circuit according to claim 7, which is characterized in that the output voltage of the accessory power supply be greater than etc.
In 12V.
9. signal control circuit according to claim 7, which is characterized in that the resistance value of the 5th resistance R5 is more than or equal to
10kΩ；The resistance value of the 6th resistance R6 is more than or equal to 10k Ω；The resistance value of the 7th resistance R7 is more than or equal to 10k Ω.
10. a kind of Switching Power Supply, which is characterized in that including prime signal output end and rear class signal output end；And
According to claim 1 to signal control circuit described in 9 any one, respectively with the prime signal output end and rear class
Signal output end connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821775603.9U CN209345121U (en) | 2018-10-30 | 2018-10-30 | Signal control circuit and Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821775603.9U CN209345121U (en) | 2018-10-30 | 2018-10-30 | Signal control circuit and Switching Power Supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209345121U true CN209345121U (en) | 2019-09-03 |
Family
ID=67746951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821775603.9U Active CN209345121U (en) | 2018-10-30 | 2018-10-30 | Signal control circuit and Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209345121U (en) |
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2018
- 2018-10-30 CN CN201821775603.9U patent/CN209345121U/en active Active
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