CN204462918U - A kind of reduction voltage circuit for switch - Google Patents
A kind of reduction voltage circuit for switch Download PDFInfo
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- CN204462918U CN204462918U CN201420633546.6U CN201420633546U CN204462918U CN 204462918 U CN204462918 U CN 204462918U CN 201420633546 U CN201420633546 U CN 201420633546U CN 204462918 U CN204462918 U CN 204462918U
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- stabilizing chip
- pressure difference
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Abstract
The utility model relates to communication power supply field, particularly a kind of reduction voltage circuit of switch.For a reduction voltage circuit for switch, include input voltage filtering circuit, output voltage filtering circuit, described reduction voltage circuit also comprises: low-dropout linear voltage-regulating circuit, short-circuit protection circuit and output voltage feedback circuit; And low-dropout linear voltage-regulating circuit comprises low voltage difference voltage stabilizing chip and current-limiting resistance; Between the input end that short-circuit protection circuit is connected in low pressure difference linearity voltage stabilizing chip and output terminal, burn chip for preventing low pressure difference linearity voltage stabilizing chip short circuit; Output voltage feedback circuit adopts divider resistance, for controlling the stable of output voltage.This practical new described a kind of reduction voltage circuit for switch, have low in energy consumption, ripple is little and the simple feature of circuit structure.
Description
Technical field
The utility model relates to communication power supply field, particularly a kind of reduction voltage circuit for switch.
Background technology
Since eighties of last century the nineties, along with improving constantly and the sharply increase of amount of information exchange of computing power, conventional local area is gradually beyond self load, switching Ethernet technology is arisen at the historic moment, greatly improve Performance of LAN, win the favor of users, made it cover the communications field widely.
But along with the data volume of switch processes is more and more huger, the working load of switch is also in continuous increase.For this reason, switch requires also improving constantly to the power supply of itself.But be all adopt traditional Switching Power Supply BUCK chip in existing switch reduction voltage circuit, voltage is dropped to specific DC voltage to power, although Switching Power Supply conversion efficiency is high, supply current large, owing to adopting periodic switching manipulation, have very large loss; And in its output voltage, usually can contain the ripple of high frequency, and certain electromagnetic interference (EMI) can be produced to peripheral circuits; Like this in the design of Switching Power Supply, need to sacrifice the power consumption of power supply and speed to suppress noise in circuit and ripple, and complex circuit designs.
Therefore, be necessary to create the new voltage feed circuit for switch, improve the defect that in prior art, exchanger power power consumption is large, ripple is large and circuit is complicated further.
Summary of the invention
For the above deficiency existed, devise to the purpose of this utility model a kind of reduction voltage circuit for switch, this reduction voltage circuit has the simple and reliable feature of low-loss, low ripple and circuit.
The technical solution adopted in the utility model is:
For a reduction voltage circuit for switch, include input voltage filtering circuit, output voltage filtering circuit, described in this, reduction voltage circuit also comprises: low-dropout linear voltage-regulating circuit, short-circuit protection circuit and output voltage feedback circuit;
Described low-dropout linear voltage-regulating circuit comprises low voltage difference voltage stabilizing chip and current-limiting resistance;
Between the input end that described short-circuit protection circuit is connected in low pressure difference linearity voltage stabilizing chip and output terminal, burn because of short circuit for preventing low pressure difference linearity voltage stabilizing chip; Described output voltage feedback circuit adopts divider resistance, for controlling the stable of output voltage.
Concrete, described low pressure difference linearity voltage stabilizing chip comprises input end IN end, output terminal OUT holds, POK end, FB end, EN end and GND hold; Described short-circuit protection circuit adopts diode, and the negative electrode of described diode is held with the output terminal OUT of low pressure difference linearity voltage stabilizing chip and is connected, and the anode of described diode is held with the input end IN of low pressure difference linearity voltage stabilizing chip and EN holds and is connected.
Concrete, described output voltage feedback circuit includes divider resistance one, divider resistance two and electric capacity, and described divider resistance two is connected with divider resistance one with after Capacitance parallel connection again, and the public connecting end of feedback resistance one and feedback resistance two is held with the FB of low pressure difference linearity voltage stabilizing chip and is connected.
Concrete, described input voltage filtering circuit comprises electrochemical capacitor one and ceramic disc capacitor one is parallel with one another forms.
Concrete, described output voltage filtering circuit comprises electrochemical capacitor two and ceramic disc capacitor two is formed in parallel mutually.
A kind of reduction voltage circuit for switch described in this utility model, adopts low-dropout linear voltage-regulating circuit, and unconventional Switching Power Supply BUCK circuit.And low pressure difference linearity voltage stabilizing chip internal is integrated with error amplifier, reference voltage, voltage comparator and Correctional tube, by described output voltage feedback circuit, the FB of output voltage sampling feedback to low pressure difference linearity voltage stabilizing chip is held, this sampled voltage compares with the reference voltage of chip internal, amplified by error approach device again, thus control the voltage swing of Correctional tube adjustment output.But not adopt the break-make of traditional Switching Power Supply breaker in middle pipe to control output voltage, thus can not because of switch break-make and loss is large repeatedly; And described voltage feedback network can monitor the output voltage of described switch reduction voltage circuit in real time, compares with chip internal reference voltage, adjustment output voltage size, can reduce output voltage ripple size; And the reduction voltage circuit of described switch is simple.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to technological means of the present utility model can be better understood, and can be implemented according to the content of instructions, and can become apparent to allow above and other object of the present utility model, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly introduced, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of a kind of reduction voltage circuit for switch described in the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
embodiment 1:
As shown in Figure 1, a kind of reduction voltage circuit for switch, includes input voltage filtering circuit 1, low-dropout linear voltage-regulating circuit 2, short-circuit protection circuit 3, output voltage feedback circuit 4 and output voltage filtering circuit 5; Described low-dropout linear voltage-regulating circuit 2 comprises low voltage difference voltage stabilizing chip U1 and current-limiting resistance R1; Described low pressure difference linearity voltage stabilizing chip U1 comprises input end IN end, output terminal OUT holds, POK end, FB end, EN end and GND hold; Described current-limiting resistance R1 one end connects the IN end of low voltage difference voltage stabilizing chip U1, and other one end of R1 is connected to the POK end of low voltage difference voltage stabilizing chip U1, input voltage vin after current-limiting resistance R1, for low voltage difference voltage stabilizing chip U1 provides certain bias current.
Described short-circuit protection circuit 3 adopts diode D1, and the negative electrode of described diode D1 is held with the output terminal OUT of low pressure difference linearity voltage stabilizing chip U1 and is connected, and the anode of described diode D1 is held with the input end IN of low pressure difference linearity voltage stabilizing chip U1 and EN holds and is connected; Chip is burnt for preventing low pressure difference linearity voltage stabilizing chip short circuit.
Described output voltage feedback circuit 4 includes divider resistance one R2, a divider resistance two R3 and filter capacitor C3, and described divider resistance two R3 connects with divider resistance one R2 with after filter capacitor C3 parallel connection again, and the public connecting end of feedback resistance one R2 and feedback resistance two R3 is held with the FB of low pressure difference linearity voltage stabilizing chip and is connected, and the output terminal OUT that other one end of feedback resistance one R2 is connected to low pressure difference linearity voltage stabilizing chip U1 holds, feedback resistance two R3 all holds with the GND of low pressure difference linearity voltage stabilizing chip U1 with other one end of filter capacitor C3 and is connected, namely ground connection.Form a closed-loop feedback circuit, for controlling the stable of output voltage.
Described input voltage filtering circuit comprises electrochemical capacitor one C1 and ceramic disc capacitor one C2 is parallel with one another forms, and described output voltage filtering circuit comprises electrochemical capacitor two C5 and ceramic disc capacitor two C4 is parallel with one another forms.Described electrochemical capacitor is used for the low-frequency ripple in filtering voltage, and ceramic disc capacitor is used for the high frequency noise in filtering voltage.
Described input voltage filtering circuit 1 positive input terminal Vin+ holds with the IN of low pressure difference linearity voltage stabilizing chip U1 and is electrically connected, and input voltage filtering circuit 1 negative input end Vin-holds with the GND of low pressure difference linearity voltage stabilizing chip U1 and is connected; Described output voltage filtering circuit 5 positive output end Vout+ holds with the OUT of low pressure difference linearity voltage stabilizing chip U1 and is connected, and output filter circuit 5 negative output terminal Vout-holds with the GND of low pressure difference linearity voltage stabilizing chip U1 and is connected.
The described reduction voltage circuit specific works process for switch is: after the low-frequency ripple that input voltage produces through input voltage filtering circuit 1 filtering prime and high frequency noise, be input to low-dropout linear voltage-regulating circuit 2, after described low-dropout linear voltage-regulating circuit 2 pairs of voltage step-down after the OUT end of low voltage difference linear voltage stabilization chip U1 exports, part voltage inputs to the load supplying of rear class through output voltage filtering circuit 5, another part is sampled by divider resistance one R2 and divider resistance two R3 dividing potential drop, feed back to the FB end of low pressure difference linearity voltage stabilizing chip U1, high fdrequency component in filter capacitor C3 filtering sampling voltage.When there is deviation in the feedback voltage at divider resistance two R3 two ends and the theoretical value of output voltage, this feedback voltage compares with the reference voltage of low pressure difference linearity voltage stabilizing chip U1 inside, differential amplification is carried out by error amplifier, produce Drazin inverse voltage, control the electric current of Correctional tube, make whole reduction voltage circuit form stable negative feedback state, thus ensure that output voltage stabilization is on setting.
Above-described embodiment, does not form the restriction to this technical scheme protection domain.The amendment done within any spirit at above-mentioned embodiment and principle, equivalently to replace and improvement etc., within the protection domain that all should be included in this technical scheme.
Claims (3)
1. for a reduction voltage circuit for switch, comprise input voltage filtering circuit, output voltage filtering circuit, it is characterized in that: also comprise low pressure difference linearity voltage stabilizing chip, short-circuit protection circuit and output voltage feedback circuit,
Low pressure difference linearity voltage stabilizing chip, comprises input end IN end, output terminal OUT holds, POK end, FB end, EN hold and GND holds;
Short-circuit protection circuit, comprise diode, and the negative electrode of described diode is held with the output terminal OUT of low pressure difference linearity voltage stabilizing chip and is connected, the input end IN that the anode of described diode connects low pressure difference linearity voltage stabilizing chip holds and EN holds, and burns because of short circuit for preventing low pressure difference linearity voltage stabilizing chip;
Output voltage feedback circuit, include divider resistance one, divider resistance two and an electric capacity, and described divider resistance two is connected with divider resistance one with after Capacitance parallel connection again, and the public connecting end of feedback resistance one and feedback resistance two is held with the FB of low pressure difference linearity voltage stabilizing chip and is connected.
2. a kind of reduction voltage circuit for switch as claimed in claim 1, is characterized in that: institute's voltage filtering circuit comprises electrochemical capacitor one and ceramic disc capacitor one, described electrochemical capacitor one and ceramic disc capacitor one parallel with one another.
3. a kind of reduction voltage circuit for switch as claimed in claim 1, is characterized in that: described output voltage filtering circuit comprises electrochemical capacitor two and ceramic disc capacitor two, described electrochemical capacitor two and ceramic disc capacitor two parallel with one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420633546.6U CN204462918U (en) | 2014-10-29 | 2014-10-29 | A kind of reduction voltage circuit for switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420633546.6U CN204462918U (en) | 2014-10-29 | 2014-10-29 | A kind of reduction voltage circuit for switch |
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| Publication Number | Publication Date |
|---|---|
| CN204462918U true CN204462918U (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420633546.6U Expired - Fee Related CN204462918U (en) | 2014-10-29 | 2014-10-29 | A kind of reduction voltage circuit for switch |
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| Country | Link |
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| CN (1) | CN204462918U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238689A (en) * | 2017-07-24 | 2017-10-10 | 重庆环投生态环境监测网络与工程治理有限公司 | Wireless detecting system is used in sewage treatment process |
-
2014
- 2014-10-29 CN CN201420633546.6U patent/CN204462918U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107238689A (en) * | 2017-07-24 | 2017-10-10 | 重庆环投生态环境监测网络与工程治理有限公司 | Wireless detecting system is used in sewage treatment process |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20151029 |
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| EXPY | Termination of patent right or utility model |