CN206481043U - One kind carries multiple-channel output single channel short circuit over-current protection circuit - Google Patents
One kind carries multiple-channel output single channel short circuit over-current protection circuit Download PDFInfo
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- CN206481043U CN206481043U CN201720161424.5U CN201720161424U CN206481043U CN 206481043 U CN206481043 U CN 206481043U CN 201720161424 U CN201720161424 U CN 201720161424U CN 206481043 U CN206481043 U CN 206481043U
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Abstract
Multiple-channel output single channel short circuit over-current protection circuit is carried the utility model discloses one kind, including the direct-flow input circuit being connected with each other successively, overcurrent sample circuit, comparator A, comparator B, switching tube and DC output circuit, also include reference circuit, comparator power supply and protection restoring circuit, the output end connection comparator A of reference circuit input, the output end of comparator power supply connects comparator A and comparator B input respectively, protect the output end of the input connecting valve pipe of restoring circuit, protect the output end connection comparator B of restoring circuit input.The utility model can realize multiple-channel output in output, and single channel can realize excessively stream short-circuit protection, without influenceing other voltage outputs；Overcurrent protection precision is high and can quickly realize the output of shut-off, and the secondary high-power output par, c voltage in road occurs without protection to ensure that user equipment is not in abnormal electrical power supply, it is ensured that electronic security circuit is reliably used.
Description
Technical field
The utility model is related to switch power technology, more particularly to a kind of to carry multiple-channel output single channel excessively stream short-circuit protection
Circuit.
Background technology
Switching Power Supply is widely used in various using electronic computer as what is dominated using small-sized, light weight and efficient feature
The almost all of electronic equipment such as terminal device, communication equipment, is that current electronics and information industry develops rapidly indispensable one
Plant power mode.In the market is related to the Switching Power Supply of multiple-channel output independence excessively stream short circuit current output, is requiring slightly higher occasion
It can not normally use, conventionally design, not only circuit is complicated, workload is big, cost is high, and efficiency is low, and because setting
The variable of timing is more, it is difficult to accurate estimation so that design result differs greatly with actual conditions, in addition it is also necessary to correct repeatedly.Therefore,
A kind of simple circuit mode of market in urgent need, using the teaching of the invention it is possible to provide the Switching Power Supply of good multichannel independence short circuit over-current protection circuit output
Circuit.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art short with multiple-channel output single channel excessively stream there is provided one kind
Road protection circuit, overcurrent protection precision is high and can quickly realize the output of shut-off.
In order to achieve the above object, the technical solution adopted in the utility model is：
One kind carry multiple-channel output single channel short circuit over-current protection circuit, including be connected with each other successively direct-flow input circuit,
Overcurrent sample circuit, comparator A, comparator B, switching tube and DC output circuit, in addition to reference circuit, comparator power supply and
Restoring circuit is protected, the output end connection comparator A of reference circuit input, the output end of comparator power supply connects ratio respectively
Compared with device A and comparator B input, the output end of the input connecting valve pipe of restoring circuit is protected, protection restoring circuit
Output end connection comparator B input.
As preferred embodiment of the present utility model, the output end of overcurrent sample circuit described in the utility model is also connected with one
Sample circuit one, the output end connection comparator A of sample circuit one input.
As preferred embodiment of the present utility model, the output end of switching tube described in the utility model is also connected with sampling electricity
Road two, the output end connection comparator B of sample circuit two input.
Compared with prior art, the beneficial effects of the utility model are：Multiple-channel output can be realized in output, single channel can be real
Existing excessively stream short-circuit protection, without influenceing other voltage outputs；Overcurrent protection precision is high and can quickly realize the output of shut-off, secondary
The high-power output par, c voltage in road occurs without protection to ensure that user equipment is not in abnormal electrical power supply, it is ensured that electronic security circuit
Reliably use.
Brief description of the drawings
Fig. 1 is circuit construction of electric power schematic diagram of the present utility model.
Fig. 2 is circuit structure schematic diagram of the present utility model.
Embodiment
Purport of the present utility model is to overcome the deficiencies in the prior art there is provided a kind of power circuit, can realize multichannel
Single channel can realize excessively stream short-circuit protection during output, without influenceing other voltage outputs.Overcurrent protection precision is high and can be quickly real
The output now turned off.Be described in detail referring to the drawings with reference to embodiment, so as to technical characteristic of the present utility model and
Advantage is interpretated more in-depth.
Overall structure diagram of the present utility model is as shown in figure 1, a kind of carry multiple-channel output single channel excessively stream short-circuit protection
Circuit, including direct-flow input circuit 10, overcurrent sample circuit 20, comparator A30, comparator B40, the switch being connected with each other successively
Pipe 50 and DC output circuit 60, in addition to reference circuit 31, comparator power supply 41 and protection restoring circuit 51, reference circuit 31
Output end connection comparator A30 input, the output end of comparator power supply 41 connects comparator A30 and comparator respectively
B40 input, protects the output end of the input connecting valve pipe 50 of restoring circuit 51, protects the output end of restoring circuit 51
Connect comparator B40 input.The output end of the overcurrent sample circuit 20 is also connected with a sample circuit 1, sample circuit
One 21 output end connection comparator A30 input；The output end of the switching tube 50 is also connected with a sample circuit 2 70, takes
The output end connection comparator B40 of sample circuit 2 70 input.
Operation principle of the present utility model is as shown in Figure 1：It is short circuit overcurrent sample circuit 20, ratio by direct-flow input circuit 10
Compared with device A30 input direct voltages, reference circuit 31 provides reference voltage and gives comparator A30, and sample circuit 1 takes excessively stream to take
The sampled voltage of sample circuit 20 feeds back to comparator A30 and comparator B40 control outputs, reaches short circuit and excessively stream purpose.Compare
Device B40 controlling switches pipe 50 exports DC voltage, comparator power supply 41 be comparator A30 and comparator B40 power supplies and
Being powered to reference circuit 31, there is provided the stability that reference voltage improves voltage output to comparator A30.Protecting restoring circuit 51 is
A kind of restoring circuit, when output end occurs in that short-circuit protection, protection restoring circuit 51 provides signal to comparator B40 makes output electricity
Road is recovered automatically, and the drive signal of the sampling switch pipe 50 of sample circuit 2 70 makes circuit working stability to comparator B40.
In addition, sample circuit 1 is connected comparator A30 and comparator B40 with overcurrent sample circuit 20, change sampling electricity
The sampling parameters on road 1 can control the startup time of whole circuit, its parameter percentage can according to actual design demand come
It is adjusted.Protection restoring circuit 51 is connected to switching tube, and protection restoring circuit 51 is exported according to the switching tube 50 of direct current output
Voltage as testing result signal so that judge power circuit whether there is anomaly.Power circuit also includes PWM and controlled
Device（Not shown in figure）, PWM control comparator B40 be controlled by protection restoring circuit 51, when output voltage occur larger fluctuation or
Person is abnormal, and meeting is fast when PWM controls comparator B40 receives the anomaly detection signal for protecting restoring circuit 51 and sample circuit 2 70
Speed transmission feedback signal switch tube 50 is controlled, and turns off 50 switching tubes, it is ensured that direct current output short circuit or overcurrent protection.This reality
With it is new can realize multiple-channel output while, single channel can realize excessively stream short-circuit protection, without influenceing other voltage outputs.Excessively stream
Protection precision is high and can quickly realize the output of shut-off.Secondary road（The circuit that i.e. DC output circuit 60 is connected）High-power output
Portion voltage occurs without protection to ensure that user equipment is not in abnormal electrical power supply, it is ensured that electronic security circuit is reliably used.
As shown in Fig. 2 direct-flow input circuit 10 is Vin, overcurrent sample circuit 20 is R1, and comparator A30 is U1A, is compared
Device B40 is U1B, and switching tube 50 is Q1, and DC output circuit 60 is Vout, and reference circuit 31 is by voltage-stabiliser tube U3（Voltage stabilizing triode）
And resistance R4, R3 composition in parallel with voltage-stabiliser tube U3, being capable of stable reference voltage, resistance R4, R3 string because setting voltage-stabiliser tube U3
Overcurrent sample circuit 20R1 output end is connected after connection, comparator power supply 41 is made up of VCC30V.Protection restoring circuit 51 includes
Triode Q3 and voltage-regulator diode ZD1, electric capacity C3, C4 of interconnection, triode Q3 are PNP triode, voltage-regulator diode ZD1
Output end connecting triode Q3 base stage, sample circuit 1 is resistance R10, and sample circuit 2 70 is resistance R2, specific each
The annexation of component is as shown in Figure 2.Restoring circuit 51 is protected to use automatic reforestation practices, when detecting excessively stream or short circuit
When, circuit disconnects output automatically, so that protection switch power supply is not damaged, after short circuit and excessively stream disappear, circuit recovers automatically
Normal work, per all can individually seal in this circuit all the way during multiple-channel output, so as to realize mutual linkage, plays independent excessively stream and protects
Shield, the purpose of all component signal transmission is provided to control Q1 switch, so as to realize protection.
Clear, complete description is carried out to the utility model by the technical scheme in above example, it is clear that described
Embodiment be the embodiment of the utility model part, rather than whole embodiment.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made is belonged to
The scope of the utility model protection.
Claims (3)
1. one kind carries multiple-channel output single channel short circuit over-current protection circuit, it is characterised in that：Including the direct current being connected with each other successively
Input circuit（10）, overcurrent sample circuit（20）, comparator A（30）, comparator B（40）, switching tube（50）And direct current output electricity
Road（60）, in addition to reference circuit（31）, comparator power supply（41）And protection restoring circuit（51）, reference circuit（31）Output
End connection comparator A（30）Input, comparator power supply（41）Output end connect comparator A respectively（30）With comparator B
（40）Input, protect restoring circuit（51）Input connecting valve pipe（50）Output end, protect restoring circuit（51）
Output end connection comparator B（40）Input.
2. according to claim 1 carry multiple-channel output single channel short circuit over-current protection circuit, it is characterised in that：The excessively stream
Sample circuit（20）Output end be also connected with a sample circuit one（21）, sample circuit one（21）Output end connection comparator A
（30）Input.
3. according to claim 1 carry multiple-channel output single channel short circuit over-current protection circuit, it is characterised in that：The switch
Pipe（50）Output end be also connected with a sample circuit two（70）, sample circuit two（70）Output end connection comparator B（40）'s
Input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720161424.5U CN206481043U (en) | 2017-02-22 | 2017-02-22 | One kind carries multiple-channel output single channel short circuit over-current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720161424.5U CN206481043U (en) | 2017-02-22 | 2017-02-22 | One kind carries multiple-channel output single channel short circuit over-current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206481043U true CN206481043U (en) | 2017-09-08 |
Family
ID=59748921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720161424.5U Expired - Fee Related CN206481043U (en) | 2017-02-22 | 2017-02-22 | One kind carries multiple-channel output single channel short circuit over-current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206481043U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092230A (en) * | 2017-12-05 | 2018-05-29 | 中国电子科技集团公司第二十八研究所 | A kind of airborne power supply system of DC source |
| CN108696111A (en) * | 2018-08-17 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
| CN117638807A (en) * | 2023-11-03 | 2024-03-01 | 浙江伊控动力系统有限公司 | Multipath output flyback power supply with independent turn-off function |
-
2017
- 2017-02-22 CN CN201720161424.5U patent/CN206481043U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092230A (en) * | 2017-12-05 | 2018-05-29 | 中国电子科技集团公司第二十八研究所 | A kind of airborne power supply system of DC source |
| CN108092230B (en) * | 2017-12-05 | 2019-10-29 | 中国电子科技集团公司第二十八研究所 | A kind of airborne power supply system of DC source |
| CN108696111A (en) * | 2018-08-17 | 2018-10-23 | 广州金升阳科技有限公司 | A kind of multiple-channel output is under-voltage and short-circuit protection circuit |
| CN117638807A (en) * | 2023-11-03 | 2024-03-01 | 浙江伊控动力系统有限公司 | Multipath output flyback power supply with independent turn-off function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170908 |