CN107546727A - Switching Power Supply bus overvoltage protection circuit - Google Patents
Switching Power Supply bus overvoltage protection circuit Download PDFInfo
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- CN107546727A CN107546727A CN201710827860.6A CN201710827860A CN107546727A CN 107546727 A CN107546727 A CN 107546727A CN 201710827860 A CN201710827860 A CN 201710827860A CN 107546727 A CN107546727 A CN 107546727A
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Abstract
The invention discloses a kind of Switching Power Supply bus overvoltage protection circuit, including：Input power circuit, for providing input supply voltage；Bleeder circuit, it is connected with input power circuit, the supply voltage for providing input power circuit carries out partial pressure, and is sent the voltage after partial pressure as control signal to ON-OFF control circuit；ON-OFF control circuit, be connected with bleeder circuit, for the control signal controlling switch power source bus according to bleeder circuit access whether, to carry out the overvoltage protection of Switching Power Supply bus.The present invention, which solves the problems, such as that Switching Power Supply input voltage is too high in the prior art, may cause Switching Power Supply correlation component damage, improve Switching Power Supply reliability.
Description
Technical field
The present invention relates to power protection field, in particular to a kind of Switching Power Supply bus overvoltage protection circuit.
Background technology
For the Switching Power Supply of common 220V exchange inputs, it is 220V exchanges to input under normal circumstances between L, N, after rectification
Voltage is 310V direct currents, and now Switching Power Supply can be with normal work.
If voltage uprises between input L, N, or input is connected into two live wires of L1, L2, then rectifier bridge output voltage will
Rise, if two live wires of access, rectifier bridge output voltage is 540V direct current, and this voltage will cause to damage to Switching Power Supply
It is bad, for example, it is all 700V that the mos that 220V exchange input switch power supplys use, which is managed typically pressure-resistant, if Switching Power Supply busbar voltage
It is 540VDC, along with transformer leakage inductance voltage and the reflected voltage of transformer secondary output winding, is then applied to the voltage at mos both ends
700V will be exceeded, the breakdown of Switching Power Supply mos pipes will be caused, it is therefore desirable to increase protection circuit, prevent Switching Power Supply input electricity
Press through high or two live wires of access and damage Switching Power Supply.
It may cause asking for Switching Power Supply correlation component damage for Switching Power Supply input voltage in correlation technique is too high
Topic, not yet propose to efficiently solve scheme at present.
The content of the invention
The invention provides a kind of Switching Power Supply bus overvoltage protection circuit, at least to solve Switching Power Supply in the prior art
Input voltage too high the problem of may causing Switching Power Supply correlation component damage.
In order to solve the above technical problems, the invention provides a kind of Switching Power Supply bus overvoltage protection circuit, including：
Input power circuit, for providing input supply voltage；
Bleeder circuit, it is connected with input power circuit, the supply voltage for providing input power circuit carries out partial pressure,
And sent the voltage after partial pressure as control signal to ON-OFF control circuit；
ON-OFF control circuit, it is connected with bleeder circuit, it is female for the control signal controlling switch power supply according to bleeder circuit
Whether is the access of line, to carry out the overvoltage protection of Switching Power Supply bus.
Further, bleeder circuit includes：First bleeder circuit and the second bleeder circuit, ON-OFF control circuit include
TL431 chips and relay, wherein, the first bleeder circuit is connected with input power circuit, TL431 chips respectively, for simultaneously
Sent the voltage after partial pressure as control signal to the control terminal of TL431 chips；Second bleeder circuit respectively with input power
Circuit, TL431 chips and relay connection, for the supply voltage progress partial pressure provided input power circuit, and
TL431 chips send the voltage after partial pressure to relay as control signal when turning on, so that relay control switch power supply
Whether is the access of bus.
Further, the first bleeder circuit includes the resistance R103 and resistance R104 of series connection, wherein, the first of resistance R103
End is connected to Switching Power Supply bus positive pole, and resistance R103 the second end is connected by first node with resistance R104 first end,
Resistance R104 the second end is connected to Switching Power Supply bus negative pole, and first node is connected with the control terminal of TL431 chips.
Further, the second bleeder circuit includes the resistance R105 and resistance R106 of series connection, wherein, the first of resistance R105
End is connected to Switching Power Supply bus positive pole, and resistance R105 the second end is connected by section point with resistance R106 first end,
Resistance R106 the second end is connected to Switching Power Supply bus negative pole, and section point is connected with relay coil first end, TL431 cores
The first end of piece is connected with the end of relay coil second, and the second end of TL431 chips is connected to Switching Power Supply bus negative pole.
Further, Switching Power Supply bus overvoltage protection circuit also includes：Rectification circuit, be arranged at input power circuit and
Between bleeder circuit, before the supply voltage for being provided in bleeder circuit input power circuit carries out partial pressure, rectification is carried out.
Further, rectification circuit includes the single-phase rectification bridge of diode D101, D102, D103, D104 composition.
Further, Switching Power Supply bus overvoltage protection circuit also includes：Filter circuit, it is arranged at rectification circuit and partial pressure
Between circuit, before the supply voltage for being provided in bleeder circuit input power circuit carries out partial pressure, it is filtered.
Further, filter circuit includes electric capacity C101, electric capacity C102, divider resistance R101, divider resistance R102, its
In, electric capacity C101 positive pole is connected to Switching Power Supply bus positive pole, and electric capacity C101 negative pole passes through the 3rd node and electric capacity C102
Positive pole connection, electric capacity C102 negative pole is connected to Switching Power Supply bus negative pole, and resistance R101 first end is connected to switch electricity
Source bus positive pole, the first end of resistance R101 the second end respectively with the 3rd node, resistance R102 are connected, and the second of resistance R102
End is connected to Switching Power Supply bus negative pole.
Further, electric capacity C101, electric capacity C102 are electrochemical capacitor.
Further, Switching Power Supply bus overvoltage protection circuit also includes：Current-limiting resistance R100, it is arranged at input power electricity
Between road and rectification circuit, for carrying out current-limiting protection to rectification circuit.
In the present invention, there is provided a kind of circuit that overvoltage protection can be carried out to Switching Power Supply bus, set in the circuit
Put bleeder circuit and coordinate ON-OFF control circuit, the supply voltage that bleeder circuit is provided input power circuit carries out partial pressure, and will
Voltage after partial pressure is sent to ON-OFF control circuit, ON-OFF control circuit as control signal to be judged whether according to control signal
Press and carry out overvoltage protection when judging over-pressed.Circuit of the present invention can solve Switching Power Supply input voltage mistake in the prior art
Height may cause the problem of Switching Power Supply correlation component damage, improve Switching Power Supply reliability.
Brief description of the drawings
Fig. 1 is a kind of optional structured flowchart of Switching Power Supply bus overvoltage protection circuit according to embodiments of the present invention；
And
Fig. 2 is a kind of electrical block diagram of Switching Power Supply bus overvoltage protection circuit according to embodiments of the present invention.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, of the invention.
Embodiment 1
Switching Power Supply bus overvoltage protection circuit provided by the invention is illustrated below in conjunction with the accompanying drawings.
Fig. 1 shows a kind of optional structured flowchart of Switching Power Supply bus overvoltage protection circuit of the present invention, as shown in figure 1,
The Switching Power Supply bus overvoltage protection circuit can include：
Input power circuit 10, for providing input supply voltage；
Bleeder circuit 20, it is connected with input power circuit 10, the supply voltage for providing input power circuit 10 enters
Row partial pressure, and sent the voltage after partial pressure as control signal to ON-OFF control circuit 30；
ON-OFF control circuit 30, it is connected with bleeder circuit 20, for the control signal controlling switch according to bleeder circuit 20
Whether is the access of power source bus, to carry out the overvoltage protection of Switching Power Supply bus.
In above-mentioned preferred embodiment, there is provided a kind of circuit that overvoltage protection can be carried out to Switching Power Supply bus,
Bleeder circuit is set to coordinate ON-OFF control circuit in the circuit, the supply voltage that bleeder circuit is provided input power circuit enters
Row partial pressure, and the voltage after partial pressure is sent to ON-OFF control circuit, ON-OFF control circuit as control signal and believed according to control
Number judge whether overvoltage and carry out overvoltage protection when judging over-pressed.Circuit of the present invention can solve Switching Power Supply input voltage
Too high the problem of may causing Switching Power Supply correlation component damage, improve Switching Power Supply reliability.
During specific implementation, Fig. 2 shows a kind of preferable circuit structure diagram, as shown in Fig. 2 bleeder circuit includes：First point
Volt circuit and the second bleeder circuit, ON-OFF control circuit include TL431 chips and relay, wherein, the first bleeder circuit point
It is not connected with input power circuit, TL431 chips, is used for and is sent the voltage after partial pressure as control signal to TL431 cores
The control terminal of piece；Second bleeder circuit is connected with input power circuit, TL431 chips and relay respectively, for input
The supply voltage that power circuit provides carries out partial pressure, and when TL431 chips turn on using the voltage after partial pressure as control signal
Send to relay so that the access of relay control switch power source bus whether.
In the preferred embodiment of above-mentioned offer, using TL431 characteristic, when control pole pin voltage is less than 2.5V, then
TL431 is not turned on, and when controller pin voltage is higher than 2.5V, then TL431 is turned on, and normally closed relay is controlled using this characteristic,
So as to realize reliably protecting.Also, because TL431 does not need stabilized power source power supply, the circuit has simple in construction, device
Less, the advantages of cost is low, reliability is high.
As a kind of alternative embodiment, TL431 can also be replaced with comparator, by way of comparing selection
Whether control turns on, and then combines protection of the relay realization to Switching Power Supply.
In an optional embodiment, as shown in Fig. 2 the first bleeder circuit includes the resistance R103 and resistance of series connection
R104, wherein, the second end that resistance R103 first end is connected to Switching Power Supply bus positive pole P, resistance R103 passes through first segment
Point is connected with resistance R104 first end, and resistance R104 the second end is connected to Switching Power Supply bus negative pole N, first node and
The control terminal connection of TL431 chips.
In the above-described embodiment, R103, R104 effect are exactly partial pressure, and a 2.5V control signal is provided for TL431,
When busbar voltage is less than certain value, R103, R104 partial pressure are less than 2.5V, and TL431 does not work, when busbar voltage is higher than certain
Value, R103, R104 partial pressure are greater than 2.5V, and TL431 is begun to turn on.
In an optional embodiment, the second bleeder circuit includes the resistance R105 and resistance R106 of series connection, wherein,
Resistance R105 first end is connected to Switching Power Supply bus positive pole, and resistance R105 the second end passes through section point and resistance R106
First end connection, resistance R106 the second end is connected to Switching Power Supply bus negative pole, section point and relay coil first
End connection, the first end of TL431 chips are connected with the end of relay coil second, and the second end of TL431 chips is connected to switch electricity
Source bus negative pole.
In the above-described embodiment, R105, R106 effect are also partial pressure, when busbar voltage is higher than certain value, R105,
R106 partial pressures obtain voltage, and (for example, R105, R106 partial pressure obtain 12V electricity) is used for the open-minded of control relay.
In fig. 2, K101 is normally closed relay, is closure during Switching Power Supply normal work, when there is overvoltage, K101 will
Disconnect, cut off busbar voltage, protect late-class circuit.In fig. 2, U101 TL431, when control signal is less than 2.5V, TL431 is cut
Only, when control signal is more than 2.5V, TL431 conductings.
As shown in Fig. 2 Switching Power Supply bus overvoltage protection circuit also includes：Rectification circuit, it is arranged at input power circuit
Between bleeder circuit, before the supply voltage for being provided in bleeder circuit input power circuit carries out partial pressure, carry out whole
Stream.During specific implementation, rectification circuit is the single-phase rectification bridge of diode D101, D102, D103, D104 composition, for input
Power supply line firewire L, zero line N carry out rectification.
Preferably, in addition to：Filter circuit, it is arranged between rectification circuit and bleeder circuit, in bleeder circuit pair
Before the supply voltage that input power circuit provides carries out partial pressure, it is filtered.During specific implementation, filter circuit includes electric capacity
C101, electric capacity C102, divider resistance R101, divider resistance R102, wherein, electric capacity C101 positive pole is connected to Switching Power Supply bus
Positive pole, electric capacity C101 negative pole are connected by the 3rd node with electric capacity C102 positive pole, and electric capacity C102 negative pole is connected to switch
Power source bus negative pole, resistance R101 first end are connected to Switching Power Supply bus positive pole, and resistance R101 the second end is respectively with
The first end connection of three nodes, resistance R102, resistance R102 the second end is connected to Switching Power Supply bus negative pole.Wherein, preferably
Ground, electric capacity C101, electric capacity C102 are electrochemical capacitor.
By C101, C102 after rectification, steady dc voltage can be obtained on C101, C102, why selects to make
Connected with two electric capacity C101, C102, main purpose be exactly for partial pressure, because if the voltage between L, N is 380VDC,
DC voltage after rectifier bridge is exactly 540VDC, if only using an electrochemical capacitor, is certain to damage (because electrolysis electricity
Hold it is pressure-resistant be up to 450VDC, if 540VDC voltage superimposeds, electric capacity can puncture and bulge, cause to damage), thus will
C101, C102 are used in series carry out partial pressure, then the voltage above C101 and C102 is exactly 270VDC, resistance to much smaller than electrochemical capacitor
450VDC is pressed, therefore can be played a protective role.
In addition, R101, R102 effect be ensure C101, C102 can reliable partial pressure, if without R101, R102, because
It is different for the ESR (equivalent series resistance) of each electrochemical capacitor, so the also just not phase of the voltage above C101, C102
Deng to ensure that C101, C102 are thoroughly pressed, so needing to increase R101, R102.
In another optional embodiment, Switching Power Supply bus overvoltage protection circuit also includes：Current-limiting resistance R100,
It is arranged between input power circuit and rectification circuit, for carrying out current-limiting protection to rectification circuit.Specifically, such as Fig. 2 institutes
Show, resistance R100 is current-limiting resistance, because when L, N are just upper electric, C101, C102 are equivalent to short-circuit condition, it is therefore desirable to increase
R100 carries out current limliting, prevents diode D101, D102, D103, D104 from being damaged because of excessively stream.
In the selection to above-mentioned component, it is preferable that R100 is current-limiting resistance, and its resistance, resistance to should be paid attention to during selection
Pressure, power；D101, D102, D103, D104 are industrial frequency rectifying diode, and forward current and reversely resistance to should be paid attention to during selection
Pressure；C101, C102 are used for energy storage, filtering, pay attention to pressure-resistant and capacitance during selection；R101、R102、R103、R104、R105、R106
The power of resistance and pressure-resistant is paid attention to for partial pressure, during selection；K101 is relay, attentional selection normally closed relay during selection, note
Anticipate its pick-up voltage, release voltage, through-current capability；U101 is TL431, pays attention to conducting electric current during use.
The operation principle of foregoing circuit provided by the invention is specifically described below, to be better understood from this hair
Bright each embodiment：
The three-phase input voltage open-phase detection protection circuit course of work of the present invention is as follows：
When voltage is 220VAC between L, N, by rectifier bridge, the voltage at C101, C102 both ends will be 310VDC, now
The voltage obtained by R103, R104 partial pressure will be substantially less that 2.5V, i.e. U101 (TL431) are not turned on, and relay K101 coils do not have
There is loop, so normally closed relay will not act, relay is also to maintain attracting state, so now Switching Power Supply can be normal
Work.
When voltage raises between L, N, for example voltage between L, N is 380VAC, by rectifier bridge, C101, C102 both ends
Voltage will be 540VDC because C101, C102 series connection carry out partial pressure, the actual voltage in each electric capacity both ends is 270VDC, far
Small 450VDC's is pressure-resistant, so electrochemical capacitor will not damage, can be with normal work；When C101, C102 both end voltage reach
540VDC, by R103, R104 partial pressure, 2.5V will be exceeded in the ohmically voltages of R104, now U101 will be opened, and be passed through in addition
R105, R106 partial pressure are crossed, has 12V in the ohmically voltages of R106, now 12V passes through relay coil, and U101 is now
It is in the conduction state, thus relay coil will obtain it is electric, normally closed relay will break contact, so relay rear end P, N
Between will there is no voltage, thoroughly late-class circuit can be disconnected, played a protective role.
After busbar voltage is restored to normally, the voltage after R103, R104 partial pressure will be less than 2.5V, and U101 is not led
It is logical, so as to which relay coil does not have loop, normally closed relay adhesive again, to continue to provide voltage, Switching Power Supply for late-class circuit
Normal work can be recovered again.
It can be seen from the foregoing description that providing one kind in an embodiment of the present invention can be carried out to Switching Power Supply bus
The circuit of overvoltage protection, bleeder circuit is set to coordinate ON-OFF control circuit in the circuit, bleeder circuit is to input power circuit
The supply voltage of offer carries out partial pressure, and is sent the voltage after partial pressure as control signal to ON-OFF control circuit, switch control
Circuit processed judges whether overvoltage according to control signal and carries out overvoltage protection when judging over-pressed.Circuit of the present invention can solve
Switching Power Supply input voltage too high the problem of may causing Switching Power Supply correlation component damage, improve Switching Power Supply reliability.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein
Its embodiment.The application be intended to the present invention any modification, purposes or adaptations, these modifications, purposes or
Person's adaptations follow the general principle of the present invention and the common knowledge in the art do not invented including the present invention
Or conventional techniques.Description and embodiments are considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
- A kind of 1. Switching Power Supply bus overvoltage protection circuit, it is characterised in that including：Input power circuit, for providing input supply voltage；Bleeder circuit, it is connected with the input power circuit, the supply voltage for providing the input power circuit is carried out Partial pressure, and sent the voltage after partial pressure as control signal to ON-OFF control circuit；The ON-OFF control circuit, it is connected with the bleeder circuit, for being opened according to the control of the control signal of the bleeder circuit Whether is the access of pass power source bus, to carry out the overvoltage protection of Switching Power Supply bus.
- 2. Switching Power Supply bus overvoltage protection circuit according to claim 1, it is characterised in that the bleeder circuit bag Include：First bleeder circuit and the second bleeder circuit, the ON-OFF control circuit include TL431 chips and relay, wherein,First bleeder circuit is connected with the input power circuit, the TL431 chips respectively, is used for and by after partial pressure Voltage is sent to the control terminal of the TL431 chips as control signal；Second bleeder circuit is connected with the input power circuit, the TL431 chips and the relay respectively, is used Carry out partial pressure in the supply voltage that provides the input power circuit, and when the TL431 chips turn on by partial pressure after Voltage is sent to the relay as control signal so that the access of the relay control switch power source bus whether.
- 3. Switching Power Supply bus overvoltage protection circuit according to claim 2, it is characterised in that first bleeder circuit Resistance R103 and resistance R104 including series connection, wherein, the first end of the resistance R103 is connected to Switching Power Supply bus positive pole, The second end of the resistance R103 is connected by first node with the first end of the resistance R104, and the second of the resistance R104 End is connected to Switching Power Supply bus negative pole, and the first node is connected with the control terminal of the TL431 chips.
- 4. Switching Power Supply bus overvoltage protection circuit according to claim 3, it is characterised in that second bleeder circuit Resistance R105 and resistance R106 including series connection, wherein, the first end of the resistance R105 is connected to Switching Power Supply bus positive pole, The second end of the resistance R105 is connected by section point with the first end of the resistance R106, and the second of the resistance R106 End is connected to Switching Power Supply bus negative pole, and the section point is connected with the relay coil first end, the TL431 chips First end be connected with the end of relay coil second, the second end of the TL431 chips is connected to Switching Power Supply bus and born Pole.
- 5. Switching Power Supply bus overvoltage protection circuit according to claim 1 or 2, it is characterised in that also include：Rectification circuit, be arranged between the input power circuit and the bleeder circuit, in the bleeder circuit to institute Before the supply voltage progress partial pressure that the offer of input power circuit is provided, rectification is carried out.
- 6. Switching Power Supply bus overvoltage protection circuit according to claim 5, it is characterised in that the rectification circuit includes The single-phase rectification bridge of diode D101, D102, D103, D104 composition.
- 7. Switching Power Supply bus overvoltage protection circuit according to claim 5, it is characterised in that also include：Filter circuit, be arranged between the rectification circuit and the bleeder circuit, in the bleeder circuit to described defeated Before the supply voltage progress partial pressure that power circuit offer is provided, it is filtered.
- 8. Switching Power Supply bus overvoltage protection circuit according to claim 7, it is characterised in that the filter circuit includes Electric capacity C101, electric capacity C102, divider resistance R101, divider resistance R102, wherein, the positive pole of the electric capacity C101 is connected to switch Power source bus positive pole, the negative pole of the electric capacity C101 are connected by the 3rd node with the positive pole of the electric capacity C102, the electric capacity C102 negative pole is connected to Switching Power Supply bus negative pole, and the first end of the resistance R101 is connected to Switching Power Supply bus positive pole, First end of the second end of the resistance R101 respectively with the 3rd node, the resistance R102 is connected, the resistance R102 The second end be connected to Switching Power Supply bus negative pole.
- 9. Switching Power Supply bus overvoltage protection circuit according to claim 8, it is characterised in that the electric capacity C101, electricity Appearance C102 is electrochemical capacitor.
- 10. Switching Power Supply bus overvoltage protection circuit according to claim 5, it is characterised in that also include：Current-limiting resistance R100, it is arranged between the input power circuit and the rectification circuit, for the rectification circuit Carry out current-limiting protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827860.6A CN107546727A (en) | 2017-09-14 | 2017-09-14 | Switching Power Supply bus overvoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827860.6A CN107546727A (en) | 2017-09-14 | 2017-09-14 | Switching Power Supply bus overvoltage protection circuit |
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| CN107546727A true CN107546727A (en) | 2018-01-05 |
Family
ID=60964129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710827860.6A Pending CN107546727A (en) | 2017-09-14 | 2017-09-14 | Switching Power Supply bus overvoltage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
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| CN106300245A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage is adjustable cut off circuit |
| CN106655103A (en) * | 2016-11-25 | 2017-05-10 | 广西大学 | Overvoltage protection circuit of household electrical appliance |
| CN207368642U (en) * | 2017-09-14 | 2018-05-15 | 珠海格力电器股份有限公司 | Switching Power Supply bus overvoltage protects circuit |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2641881Y (en) * | 2003-08-05 | 2004-09-15 | 中国重型汽车集团有限公司 | Overvoltage protector for generator of heavy truck |
| CN102545629A (en) * | 2011-12-26 | 2012-07-04 | 上海交通大学 | Power source for subway locomotive |
| CN204668911U (en) * | 2015-05-30 | 2015-09-23 | 林志明 | A kind of voltage protection circuit |
| CN106300245A (en) * | 2016-09-30 | 2017-01-04 | 成都烨辰新材料科技有限公司 | Intelligent clothes cabinet overvoltage is adjustable cut off circuit |
| CN106655103A (en) * | 2016-11-25 | 2017-05-10 | 广西大学 | Overvoltage protection circuit of household electrical appliance |
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| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
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