CN207732617U - A kind of switching power circuit that safety is good - Google Patents
A kind of switching power circuit that safety is good Download PDFInfo
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- CN207732617U CN207732617U CN201721689104.3U CN201721689104U CN207732617U CN 207732617 U CN207732617 U CN 207732617U CN 201721689104 U CN201721689104 U CN 201721689104U CN 207732617 U CN207732617 U CN 207732617U
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Abstract
The utility model discloses a kind of good switching power circuits of safety, including external power supply unit, control unit, switch unit, rectification circuit and switch isolation unit；External power supply unit provides primary current to switching power circuit；Control unit output pulse signal；Rectification circuit is arranged between external power supply unit and switch isolation unit, the interference signal for eliminating the original current signal source that external power supply unit is exported；Switch unit is arranged between control unit and switch isolation unit, and selectively the pulse signal of output control unit is used to control the working condition of switch isolation unit.By the way that switch unit is arranged in the application, control unit and switch isolation unit are obstructed, simultaneously and power supply is directly introduced into switch isolation unit, control unit and switch isolation circuit generally use difference power supply circuit are realized when not introducing other power-supply devices, avoid control unit failure and cause the failure of follow-up equipment.
Description
Technical field
The present invention relates to switching power circuits, and in particular to a kind of switching power circuit that safety is good.
Background technology
Switching power circuit small power consumption, it is efficient.In switching power circuit, transistor V under the excitation of pumping signal,
It is alternately operated in the on off state of conducting-cut-off and cut-off-conducting, and quickly, frequency is generally 50kHz to conversion speed
Left and right.Adjustment element be operated on off state regulated power supply adjustment element generally uses transistor it is silicon-controlled magnetic switch etc..
What is generally connect behind switching power circuit is relay driving etc., is powered to follow-up equipment using switching circuit；It is logical
Normal switching power circuit include original power, the control unit for exporting Pulse Width Control switching power circuit and with control
The switch isolation circuit of unit connection, the external equipment etc. being connect with switch isolation circuit.Existing control unit with switch every
It is typically all to share the power supply relationship that obtains, but control unit is held since work difficulty is big and operating voltage is larger from unit
It is vulnerable to damage, once impaired inside control unit, switch isolation circuit will be damaged, and switch isolation circuit stops work suddenly
Make, it is easy to influence external equipment, to which successional damage can be caused, cause inestimable equipment to lose, if controlling
When impaired inside unit processed, switch isolation circuit still can for some time or work on, and successional damage is just
It will not occur.
Invention content
It is an object of the invention to：For in the prior art since control unit and switch isolation circuit generally use are continuous
The mode of formula power supply and cause once control unit is impaired to may result in switch isolation circuit and the follow-up equipment chain of rings is impaired
Problem, this application provides a kind of good switching power circuits of safety.
The technical solution adopted by the present invention is as follows：
A kind of switching power circuit that safety is good, including external power supply unit, control unit, switch unit, rectified current
Road and switch isolation unit；
The external power supply unit：Primary current is provided to switching power circuit；
Described control unit：Output pulse signal；
The rectification circuit：It is arranged between external power supply unit and switch isolation unit, it is single for eliminating external power supply
The interference signal in the original current signal source that member is exported；
The switch unit：It is arranged between control unit and the switch isolation unit, selectively output control unit
Pulse signal is used to control the working condition of switch isolation unit.
Specifically, the switch unit is made of field-effect tube Q2；
The grid of field-effect tube Q2 and the output end of control unit connect；
The source electrode of field-effect tube Q2 is grounded.
Specifically, the switch isolation unit includes switch U1；
The drain electrode of field-effect tube Q2 is connect with one end of switch U1.
Specifically, the rectification circuit by the 4th capacitance C4, the 4th diode D4, the 6th resistance R6, the 5th diode D5,
6th diode D6, the 8th resistance R8, the 5th capacitance C5, the 7th resistance R7 and the 6th diode D6 compositions；
The drain electrode of field-effect tube Q2 is connect with one end of the 4th capacitance C4, and the other end of the 4th capacitance C4 is another with switch U1's
One end connects；
The drain electrode of field-effect tube Q2 is connect with the high electrode of the 4th diode D4, the low electrode and the 6th of the 4th diode D4
One end of resistance R6 connects, and the other end of the 6th resistance R6 is connect with the low electrode of the 5th diode D5, the 5th diode D5's
High electrode is connect with the low electrode of one end of the 8th resistance R8 and the 6th diode D6 respectively, the other end of the 8th resistance R8 and
One end of five capacitance C5 and the connection of one end of the 7th resistance R7, the other end of the 5th capacitance C5 and the 7th resistance R7's is another
One end is connect with the third end of switch U1, and the high electrode of the 6th diode D6 is connect with one end of external power supply unit.
Specifically, the other end of external power supply unit is connect with the other end of switch U1.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. by the way that switch unit is arranged in the application, control unit and switch isolation unit are obstructed, while and will power supply
Power supply is directly introduced into switch isolation unit, realized when not introducing other power-supply devices control unit with switch every
From circuit generally use difference power supply circuit, avoids control unit failure and cause the failure of follow-up equipment；
2. being also provided with rectification unit between switch isolation unit and external power supply unit in the application, reduce external
The interference signal for the original power signal that power supply unit is exported realizes the more stable work of switch isolation unit.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.Attached drawing does not press actual size equal proportion scaling deliberately and draws attached drawing, it is preferred that emphasis is shows the master of the present invention
Purport.
Fig. 1 is the module diagram of Switching Power Supply；
Fig. 2 is the circuit diagram of Switching Power Supply；
Reference numeral：
The external power supply units of 10-；30- control units；40- switch isolation units；50- rectification circuits；70- switch units.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
Referring to fig. 1 and fig. 2：A kind of switching power circuit that safety is good, including external power supply unit 10, control list
Member 30, switch unit 70, rectification circuit 50 and switch isolation unit 40；
The external power supply unit 10：Primary current is provided to switching power circuit；
Described control unit 30：Output pulse signal；
The rectification circuit 50：It is arranged between external power supply unit 10 and switch isolation unit 40, it is external for eliminating
The interference signal in the original current signal source that power supply unit 10 is exported；
The switch unit 70：It is arranged between control unit 30 and switch isolation unit 40, selectively output control
The pulse signal of unit 30 is used to control the working condition of switch isolation unit 40.
Specifically, the switch unit 70 is made of field-effect tube Q2；
The grid of field-effect tube Q2 is connect with the output end of control unit 30；
The source electrode of field-effect tube Q2 is grounded.
Specifically, the switch isolation unit 40 includes switch U1；
The drain electrode of field-effect tube Q2 is connect with one end of switch U1.
Specifically, the rectification circuit 50 is by the 4th capacitance C4, the 4th diode D4, the 6th resistance R6, the 5th diode
D5, the 6th diode D6, the 8th resistance R8, the 5th capacitance C5, the 7th resistance R7 and the 6th diode D6 compositions；
The drain electrode of field-effect tube Q2 is connect with one end of the 4th capacitance C4, and the other end of the 4th capacitance C4 is another with switch U1's
One end connects；
The drain electrode of field-effect tube Q2 is connect with the high electrode of the 4th diode D4, the low electrode and the 6th of the 4th diode D4
One end of resistance R6 connects, and the other end of the 6th resistance R6 is connect with the low electrode of the 5th diode D5, the 5th diode D5's
High electrode is connect with the low electrode of one end of the 8th resistance R8 and the 6th diode D6 respectively, the other end of the 8th resistance R8 and
One end of five capacitance C5 and the connection of one end of the 7th resistance R7, the other end of the 5th capacitance C5 and the 7th resistance R7's is another
One end is connect with the third end of switch U1, and the high electrode of the 6th diode D6 is connect with one end of external power supply unit 10.
Specifically, the other end of external power supply unit 10 is connect with the other end of switch U1.
By the way that switch unit 70 is arranged in the application, control unit 30 and switch isolation unit 40 are obstructed, while and will
Power supply is directly introduced into switch isolation unit 40, and control unit 30 is realized when not introducing other power-supply devices
With switch isolation circuit generally use difference power supply circuit, avoids 30 failure of control unit and cause the failure of follow-up equipment.
Embodiment two
On the basis of embodiment one, it is additionally provided with relay, output end of the relay directly with switch isolation unit 40
Connection, while control unit 30 controls the working condition of switch isolation unit 40, external confession using that can export pulse
Electric unit 10 is using steady voltage source.
Wherein the specific work process of above-described embodiment is described in detail：
External power supply unit 10 provides the current source of most original, 10 1 side of external power supply unit for entire switching power circuit
Face enters control unit 30, and unit 30 is powered in order to control, 30 output pulse signal of control unit, when the voltage value of signal is more than field
When the cut-in voltage of effect pipe Q2, the pulse signal of 40 reception control unit 30 of switch isolation unit output, and realize work
Make the conversion (ON/OFF) of state；10 another aspect of external power supply unit is switch isolation unit 40 by rectification circuit 50 simultaneously
Power supply is provided, such power supply is no longer to supply switch isolation unit 40 by control unit 30, but directly feed switch isolation
Unit 40, when control unit 30 breaks down, switch isolation unit 40 remains unchanged the working condition that can remain current without sending out
Outside business, the continuity of follow-up equipment is caused to damage problem so as to avoid the 40 unexpected start and stop of switch isolation unit.
Above-mentioned control unit uses PLC.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Belong to those skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in all are answered
It is included within the scope of the present invention.
Claims (5)
1. a kind of good switching power circuit of safety, which is characterized in that including external power supply unit (10), control unit
(30), switch unit (70), rectification circuit (50) and switch isolation unit (40)；
The external power supply unit (10)：Primary current is provided to switching power circuit；
Described control unit (30)：Output pulse signal；
The rectification circuit (50)：It is arranged between external power supply unit (10) and switch isolation unit (40), it is outer for eliminating
Connect the interference signal in the original current signal source that power supply unit (10) is exported；
The switch unit (70)：It is arranged between control unit (30) and switch isolation unit (40), selectively output control
The pulse signal of unit (30) processed is used to control the working condition of switch isolation unit (40).
2. a kind of switching power circuit that safety is good as described in claim 1, which is characterized in that the switch unit (70)
It is made of field-effect tube Q2；
The grid of field-effect tube Q2 is connect with the output end of control unit (30)；
The source electrode of field-effect tube Q2 is grounded.
3. a kind of switching power circuit that safety is good as claimed in claim 2, which is characterized in that the switch isolation unit
(40) include switch U1；
The drain electrode of field-effect tube Q2 is connect with one end of switch U1.
4. a kind of switching power circuit that safety is good as described in claim 1, which is characterized in that the rectification circuit (50)
By the 4th capacitance C4, the 4th diode D4, the 6th resistance R6, the 5th diode D5, the 6th diode D6, the 8th resistance R8,
Five capacitance C5, the 7th resistance R7 and the 6th diode D6 compositions；
The drain electrode of field-effect tube Q2 is connect with one end of the 4th capacitance C4, the other end of the other end and switch U1 of the 4th capacitance C4
Connection；
The drain electrode of field-effect tube Q2 is connect with the high electrode of the 4th diode D4, the low electrode and the 6th resistance of the 4th diode D4
One end of R6 connects, and the other end of the 6th resistance R6 is connect with the low electrode of the 5th diode D5, the height electricity of the 5th diode D5
Pole is connect with the low electrode of one end of the 8th resistance R8 and the 6th diode D6 respectively, the other end of the 8th resistance R8 and the 5th electricity
Hold one end of C5 and one end connection of the 7th resistance R7, the other end of the 5th capacitance C5 and the other end of the 7th resistance R7 with
The third end of switch U1 connects, and the high electrode of the 6th diode D6 is connect with one end of external power supply unit (10).
5. a kind of switching power circuit that safety is good as claimed in claim 4, which is characterized in that external power supply unit (10)
The other end connect with the other end of switch U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689104.3U CN207732617U (en) | 2017-12-07 | 2017-12-07 | A kind of switching power circuit that safety is good |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721689104.3U CN207732617U (en) | 2017-12-07 | 2017-12-07 | A kind of switching power circuit that safety is good |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207732617U true CN207732617U (en) | 2018-08-14 |
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ID=63097876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721689104.3U Active CN207732617U (en) | 2017-12-07 | 2017-12-07 | A kind of switching power circuit that safety is good |
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| CN (1) | CN207732617U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920181A (en) * | 2019-04-02 | 2019-06-21 | 深圳市鑫德亮电子有限公司 | Urgent call alarm and its circuit |
-
2017
- 2017-12-07 CN CN201721689104.3U patent/CN207732617U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109920181A (en) * | 2019-04-02 | 2019-06-21 | 深圳市鑫德亮电子有限公司 | Urgent call alarm and its circuit |
| CN109920181B (en) * | 2019-04-02 | 2024-02-13 | 深圳市鑫德亮电子有限公司 | Emergency call alarm and circuit thereof |
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