CN207007931U - The overvoltage undervoltage detection circuit and Switching Power Supply of Switching Power Supply - Google Patents
The overvoltage undervoltage detection circuit and Switching Power Supply of Switching Power Supply Download PDFInfo
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- CN207007931U CN207007931U CN201720808297.3U CN201720808297U CN207007931U CN 207007931 U CN207007931 U CN 207007931U CN 201720808297 U CN201720808297 U CN 201720808297U CN 207007931 U CN207007931 U CN 207007931U
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Abstract
The utility model discloses a kind of overvoltage undervoltage detection circuit of Switching Power Supply and Switching Power Supply, the overvoltage undervoltage detection circuit of the Switching Power Supply includes input, for inputting detected voltage；Over-voltage detection circuit unit, for setting over-pressed hysteresis voltage and carrying out over-pressed detection to the voltage of input according to overvoltage protection hysteresis voltage；Undervoltage detection circuit unit, for setting under-voltage hysteresis voltage and carrying out under-voltage detection to the voltage of input according to under-voltage hysteresis voltage；Output end, for exporting overvoltage/undervoltage protection signal；The detection input of over-voltage detection circuit unit and the detection input of undervoltage detection circuit unit are connected with input, and the detection output of over-voltage detection circuit unit and the detection output of undervoltage detection circuit unit are connected with output end.The utility model improves the reliability of Switching Power Supply.
Description
Technical field
It the utility model is related to electronic technology field, more particularly to a kind of overvoltage undervoltage detection circuit of Switching Power Supply and open
Powered-down source.
Background technology
At present, the input voltage range of single-phase switch power supply is usually 85V~264V, overtension or it is too low when, have
A little switching power source chips can not provide overvoltage protection in time or under-voltage protection, or these switching power source chips without overvoltage and
Under-voltage protection function, as switching power source chip TNY278 has an input undervoltage defencive function, but without input over-voltage protecting function.Example again
During as in air-conditioner set engineering by live wire and reversed zero line, input electrochemical capacitor can be not only damaged, and it is poor in high frequency transformer
When alienation leakage inductance is larger can also breakdown switch power supply chip, therefore, in Switching Power Supply set over-and under-voltage detect and protection electricity
Road is necessary.
However, the overvoltage undervoltage detection circuit in existing Switching Power Supply is generally all not provided with over-pressed hysteresis voltage and under-voltage
Hysteresis voltage, therefore, when voltage ripple of power network, Switching Power Supply can be in critical voltage point continually in protection with exiting protection
Between redirect, so as to cause the reliability of Switching Power Supply poor.
Utility model content
Main purpose of the present utility model is to provide a kind of overvoltage undervoltage detection circuit of Switching Power Supply, it is intended to which raising is opened
The reliability in powered-down source.
To achieve these goals, the utility model provides a kind of overvoltage undervoltage detection circuit of Switching Power Supply, described to open
The overvoltage undervoltage detection circuit in powered-down source includes：
Input, for inputting detected voltage；
Over-voltage detection circuit unit, for setting over-pressed hysteresis voltage and according to the overvoltage protection hysteresis voltage to institute
The voltage for stating input carries out over-pressed detection；
Undervoltage detection circuit unit, for setting under-voltage hysteresis voltage and according to the under-voltage hysteresis voltage to described defeated
The voltage for entering end carries out under-voltage detection；
Output end, for exporting overvoltage/undervoltage protection signal；
The detection input of the over-voltage detection circuit unit and the detection input of the undervoltage detection circuit unit are equal
It is connected with the input, the detection of the detection output of the over-voltage detection circuit unit and the undervoltage detection circuit unit
Output end is connected with the output end.
Preferably, the over-voltage detection circuit unit includes operating voltage input, reference voltage input terminal, the first electricity
Resistance, second resistance, 3rd resistor, first voltage comparator, the first diode and over-pressed hysteresis voltage set circuit subelement；Its
In：
The first end of the first resistor is the detection input of the over-voltage detection circuit unit, the first resistor
First end is connected with the input, the second end of first resistor anti-phase input with the first voltage comparator respectively
The connection of the first end of end and the second resistance；The second end ground connection of the second resistance；The first voltage comparator it is same
Phase input sets circuit the subelement output end with the first voltage comparator and institute respectively through the over-pressed hysteresis voltage
Reference voltage input terminal connection is stated, the output end of the first voltage comparator is also through the 3rd resistor and the operating voltage
Input is connected, and the negative electrode of the output end of the first voltage comparator also with first diode is connected；Described 1st
The anode of pole pipe is the detection output of the over-voltage detection circuit unit, the anode of first diode and the under-voltage inspection
Slowdown monitoring circuit unit is connected, and the anode of first diode is also connected with the output end；The electricity of the first voltage comparator
Source anode is connected with the operating voltage input, the power supply negative terminal ground connection of the first voltage comparator.
Preferably, the over-pressed hysteresis voltage sets circuit subelement to include the 4th resistance and the 5th resistance；Wherein：
The first end of 4th resistance is connected with the in-phase input end of the first voltage comparator, the 4th resistance
The second end be connected respectively with the first end of the 5th resistance and the reference voltage input terminal；The second of 5th resistance
End is connected with the output end of the first voltage comparator.
Preferably, the undervoltage detection circuit unit includes the 6th resistance, the 7th resistance, second voltage comparator, second
Diode and under-voltage hysteresis voltage set circuit subelement；Wherein：
The first end of 6th resistance is the detection input of the undervoltage detection circuit unit, the 6th resistance
First end is connected with the input, the second end of the 6th resistance homophase input with the second voltage comparator respectively
End and the under-voltage hysteresis voltage set the connection of circuit subelement；The inverting input of the second voltage comparator and the ginseng
Voltage input end connection is examined, the output end of the second voltage comparator is through the 7th resistance and the operating voltage input
Connection, the negative electrode of the output end of the second voltage comparator also with second diode are connected；Second diode
Anode is the detection output of the undervoltage detection circuit unit, the anode of second diode and the overvoltage detection electricity
The anode connection of first diode described in the unit of road, the anode of second diode are also connected with the output end；It is described
The power positive end of second voltage comparator is connected with the operating voltage input, the power supply negative terminal of the second voltage comparator
Ground connection.
Preferably, the under-voltage hysteresis voltage sets circuit subelement to include the 8th resistance and the 9th resistance；Wherein：
The first end of 8th resistance respectively with the second end of the 6th resistance and the second voltage comparator
In-phase input end connects, the second end ground connection of the 8th resistance；The first end of 9th resistance and the second voltage ratio
In-phase input end compared with device is connected, and the second end of the 9th resistance is connected with the output end of the second voltage comparator.
Preferably, the overvoltage undervoltage detection circuit of the Switching Power Supply also includes the 3rd diode, the 3rd diode
Anode be connected with the output end, the negative electrode of the 3rd diode and the second electricity described in the undervoltage detection circuit unit
Press the inverting input connection of comparator.
In addition, to achieve the above object, the utility model also provides a kind of Switching Power Supply, the Switching Power Supply is included as above
The overvoltage undervoltage detection circuit of described Switching Power Supply.
The utility model provides a kind of overvoltage undervoltage detection circuit of Switching Power Supply, the over-and under-voltage detection of the Switching Power Supply
Circuit includes input, for setting over-pressed hysteresis voltage and according to the overvoltage protection hysteresis voltage to the input
Voltage carries out the over-voltage detection circuit unit of over-pressed detection, for setting under-voltage hysteresis voltage and according to the under-voltage return difference electricity
Press the undervoltage detection circuit unit of the under-voltage detection of voltage progress to the input and for according to the overvoltage detection electricity
The testing result output over-voltage protection signal of road unit and according to the testing result of the undervoltage detection circuit unit export it is under-voltage
The output end of protection signal；The detection of the detection input of the over-voltage detection circuit unit and the undervoltage detection circuit unit
Input is connected with the input, the detection output of the over-voltage detection circuit unit and the undervoltage detection circuit list
The detection output of member is connected with the output end.The overvoltage undervoltage detection circuit of the utility model Switching Power Supply, which solves, to be set
The problem of putting over-pressed hysteresis voltage and under-voltage hysteresis voltage, Switching Power Supply is in critical voltage point frequency when avoiding voltage ripple of power network
Redirected numerously between protecting and exiting protection, so as to improve the reliability of Switching Power Supply.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to the structure shown in these accompanying drawings.
Fig. 1 is the electrical block diagram of the embodiment of overvoltage undervoltage detection circuit one of the utility model Switching Power Supply；
Fig. 2 is input described in the embodiment of overvoltage undervoltage detection circuit one of the utility model Switching Power Supply, described the
The signal waveform schematic diagram of the output end of one voltage comparator and the output end of the second voltage comparator.
Realization, functional characteristics and the advantage of the utility model purpose will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that specific embodiment described herein is not used to limit this only to explain the utility model
Utility model.
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only part of the embodiment of the present utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, belong to the scope of the utility model protection.
If it is to be appreciated that the description for being related to " first ", " second " etc. in the utility model be only used for describe purpose, without
It is understood that to indicate or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
At least one this feature can be expressed or be implicitly included to the feature of " first ", " second ".In addition, between each embodiment
Technical scheme can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, work as technical scheme
Combination occur conflicting or will be understood that the combination of this technical scheme is not present when can not realize, also not in this practicality newly
Within the protection domain of type requirement.
The utility model provides a kind of overvoltage undervoltage detection circuit of Switching Power Supply, and reference picture 1 in one embodiment, should
The overvoltage undervoltage detection circuit of Switching Power Supply includes input 101, over-voltage detection circuit unit 102, undervoltage detection circuit unit
103 and output end 104；
Wherein, the input 101, for inputting detected voltage；
The over-voltage detection circuit unit 102, for setting over-pressed hysteresis voltage and according to the overvoltage protection return difference
Voltage carries out over-pressed detection to the voltage of the input 101；
The undervoltage detection circuit unit 103, for setting under-voltage hysteresis voltage and according to the under-voltage hysteresis voltage
Under-voltage detection is carried out to the voltage of the input 101；
The output end 104, for being believed according to the testing result output over-voltage protection of the over-voltage detection circuit unit 102
Number and according to the testing result of the undervoltage detection circuit unit 103 export UVP signal.
The detection of the detection input of the over-voltage detection circuit unit 102 and the undervoltage detection circuit unit 103 is defeated
Enter end to be connected with the input 101, the detection output of the over-voltage detection circuit unit 102 and the under-voltage detection electricity
The detection output of road unit 103 is connected with the output end 104.
In the present embodiment, the over-voltage detection circuit unit 102 includes operating voltage input VCC, reference voltage inputs
Hold V_ref, first resistor R1, second resistance R2,3rd resistor R3, first voltage comparator U1, the first diode D1 and overvoltage
Hysteresis voltage sets circuit subelement 1021.Specifically, the first end of the first resistor is the over-voltage detection circuit unit
Detection input, the first end of the first resistor R1 is connected with the input 101, the second end of the first resistor R1
It is connected respectively with the inverting input of the first voltage comparator U1 and the first end of the second resistance R2；Second electricity
Hinder R2 the second end ground connection；The in-phase input end of the first voltage comparator U1 sets circuit through the over-pressed hysteresis voltage
Unit 1021 is connected with the output end of the first voltage comparator U1 and the reference voltage input terminal V_ref respectively, described
First voltage comparator U1 output end is also connected through the 3rd resistor R3 with the operating voltage input VCC, and described
Negative electrode of the one voltage comparator U1 output end also with the first diode D1 is connected；The anode of the first diode D1 is
The detection output of the over-voltage detection circuit unit 102, anode and the undervoltage detection circuit of the first diode D1
Unit 103 is connected, and the anode of the first diode D1 is also connected with the output end 104；The first voltage comparator U1
Power positive end be connected with the operating voltage input VCC, the power supply negative terminal of first voltage comparator U1 ground connection.
In the present embodiment, the over-pressed hysteresis voltage sets circuit subelement 1021 to include the 4th resistance R4 and the 5th resistance
R5.Specifically, the first end of the 4th resistance R4 is connected with the in-phase input end of the first voltage comparator U1, and described
Four resistance R4 the second end is connected with the first end of the 5th resistance R5 and the reference voltage input terminal V_ref respectively；Institute
The second end for stating the 5th resistance R5 is connected with the output end of the first voltage comparator U1.
In the present embodiment, the undervoltage detection circuit unit 103 includes the 6th resistance R6, the 7th resistance R7, second voltage
Comparator U2, the second diode D2 and under-voltage hysteresis voltage set circuit subelement 1031.Specifically, the 6th resistance R6
First end is the detection input of the undervoltage detection circuit unit 103, the first end of the 6th resistance R6 and the input
The connection of end 101, the second end of the 6th resistance R6 respectively with the in-phase input end of the second voltage comparator U2 and described
Under-voltage hysteresis voltage sets circuit subelement 1031 to connect；The inverting input of the second voltage comparator U2 and the reference
Voltage input end V_ref connections, the output end of the second voltage comparator U2 is through the 7th resistance R7 and work electricity
Input VCC connections are pressed, the negative electrode of the output end of the second voltage comparator U2 also with the second diode D2 is connected；Institute
The anode for stating the second diode D2 is the detection output of the undervoltage detection circuit unit 103, the second diode D2's
Anode is connected with the anode of the first diode D1 described in the over-voltage detection circuit unit 102, the second diode D2's
Anode is also connected with the output end 104；The power positive end of the second voltage comparator U2 and the operating voltage input
VCC connections, the power supply negative terminal ground connection of the second voltage comparator U2.
In the present embodiment, the under-voltage hysteresis voltage sets circuit subelement 1031 to include the 8th resistance R8 and the 9th resistance
R9.The first end of the 8th resistance R8 respectively with the second end of the 6th resistance R6 and the second voltage comparator U2
In-phase input end connects, the second end ground connection of the 8th resistance R8；The first end of the 9th resistance R9 and the described second electricity
Press comparator U2 in-phase input end connection, the second end of the 9th resistance R9 and the output of the second voltage comparator U2
End connection.
The overvoltage undervoltage detection circuit of the present embodiment Switching Power Supply also includes the 3rd diode D3, the 3rd diode D3
Anode be connected with the output end 104, the negative electrode of the 3rd diode D3 and institute in the undervoltage detection circuit unit 103
State second voltage comparator U2 inverting input connection.In the present embodiment, the 3rd diode D3 can prevent this implementation
The external circuit of the overvoltage undervoltage detection circuit of example Switching Power Supply impacts to the second voltage comparator U2, so as to ensure
The inverting input terminal circuit of the second voltage comparator U2 is not influenceed by external circuit.
It is understood that in the present embodiment, the first voltage comparator U1 and the second voltage comparator U2 can
Think two single voltage comparators, or two comparators in dual operational amplifier.Preferably, the present embodiment
In, the first voltage comparator U1 and the second voltage comparator U2 are 2 comparisons in dual operational amplifier LM2903
Device.
In the present embodiment, the 3rd resistor R3 in the over-voltage detection circuit unit 102 is the first voltage ratio
Compared with device U1 pull-up resistor, the 11st resistance R11 in the undervoltage detection circuit unit 103 is the second voltage ratio
Compared with device U2 pull-up resistor.
In the present embodiment, when the voltage of the input 101 is in normal voltage range, the first voltage comparator
U1 and the second voltage comparator U2 export high level；When the voltage of input 101 occurs over-pressed, first electricity
Press the voltage of in-phase input end of the voltage more than the first voltage comparator U1 of comparator U1 inverting input, described the
One voltage comparator U1 output end becomes low level by original high level, now due to the second voltage comparator U2's
The voltage at in-phase input end end of the voltage of inverting input less than the second voltage comparator U2, therefore second voltage ratio
Compared with device U2 export high level, now in order to prevent the first voltage comparator U1 to the second voltage comparator U2 formed rush
Hit, therefore set the second diode D2, the second diode D2 that there is reverse cut-off to act on；In the present embodiment, when described
When the voltage of input 101 occurs under-voltage, the voltage of the inverting input of the first voltage comparator U1 is less than the described first electricity
The voltage of comparator U1 in-phase input end is pressed, the first voltage comparator U1 exports high level, now due to described second
The voltage of in-phase input end of the voltage of voltage comparator U2 inverting input more than the second voltage comparator U2, therefore institute
Second voltage comparator U2 output end output low level is stated, now in order to prevent the second voltage comparator U2 to described the
One voltage comparator U1 forms impact, therefore sets the first diode D1 reversely to be ended.
In the present embodiment, when the voltage of the input 101 is in normal voltage range, the first voltage comparator
U1 output high level, now, the voltage of the in-phase input end of the first voltage comparator U1The voltage V of the in-phase input end of the first voltage comparator U11 +For the mistake
The overvoltage protection fiducial value of pressure detection circuit unit 102, the voltage of the inverting input of the first voltage comparator U1The voltage that wherein VIN is inputted by the input 101.The present embodiment is compared by the first voltage
The voltage V of device U1 in-phase input end1 +With the voltage V of the inverting input of the first voltage comparator U12 +It can determine that this reality
The overvoltage protection setting value v_ov of example is applied, the overvoltage of the present embodiment recovers voltageThat is this reality
Apply in example, the over-pressed hysteresis voltage of the over-voltage detection circuit unit 102
In the present embodiment, when the voltage of the input 101 is in normal voltage range, the second voltage comparator
U2 output high level, now, the voltage of the in-phase input end of the second voltage comparator U2Wherein, VIN be the input 101 voltage, the second voltage comparator U2
In-phase input end voltage V3 +For the under-voltage protection fiducial value of the undervoltage detection circuit unit 103, the second voltage ratio
The voltage of inverting input compared with device U2 is V_ref, the present embodiment by the second voltage comparator U2 in-phase input end
Voltage V3 +It can determine that the under-voltage protection of the present embodiment is set with the voltage V_ref of the inverting input of the second voltage comparator U2
Definite value v_uv, the under-voltage recovery voltage in the present embodimentWherein, VIN is the input
In 101 voltage, i.e. the present embodiment, the under-voltage hysteresis voltage of the undervoltage detection circuit unit 103
Fig. 2 is input described in the embodiment of overvoltage undervoltage detection circuit one of the utility model Switching Power Supply, described the
The signal waveform schematic diagram of the output end of one voltage comparator and the output end of the second voltage comparator, in the lump reference picture 1
And A is the waveform diagram of the voltage of the input 101 in Fig. 2, Fig. 2, B is the output end of the first voltage comparator U1
Voltage waveform view, C be the second voltage comparator U2 output end voltage waveform view.The present embodiment can be with
By setting the resistance of each resistance in the over-voltage detection circuit unit 102, the overvoltage protection setting value v_ov is arranged to
404V, the overvoltage is recovered into voltage v_recover_ov and is arranged to 399V, namely the present embodiment can be by setting the mistake
The resistance of each resistance, 5V (Δ v_ov=v_ are arranged to by the over-pressed hysteresis voltage Δ v_ov in pressure detection circuit unit 102
Ov-v_recover_ov=404V-399V=5V)；The present embodiment can also be by setting the undervoltage detection circuit unit 103
In each resistance resistance, the under-voltage protection setting value v_uv is arranged to 200V, by the under-voltage recovery voltage v_
Recover_uv is arranged to 205V, namely the present embodiment can be by setting each resistance in the undervoltage detection circuit unit 103
Resistance, the under-voltage hysteresis voltage Δ v_uv is arranged to 5V (Δ v_uv=v_recover_uv-v_uv=205V-200V
=5V).In the present embodiment, the voltage of input 101 described in the t1 moment is 404V, and the voltage of input 101 is described in the t2 moment
399V, then in t1 to t2 times, the first voltage comparator U1 exports low level, the second voltage comparator in this time
U2 exports high level, i.e., in the present embodiment, when first voltage comparator U1 output low levels and the second voltage compares
When device U2 exports high level, the output end 104 exports low level overvoltage protection signal；In the present embodiment, described in the t3 moment
The voltage of input 101 is 200V, and the voltage of input 101 described in the t4 moment is 205V, then in t3 to t4 times, described second
Voltage comparator U2 exports low level, and the first voltage comparator U1 exports high level in this time, i.e., in the present embodiment,
When the second voltage comparator U2 exports low level and first voltage comparator U1 output high level, the output end
The 104 low level UVP signals of output；In the present embodiment, after 0 to t1, t2 to t3 the and t4 moment, the input 101
Voltage be in normal voltage range, therefore, after 0 to t1, t2 to t3 the and t4 moment, the first voltage comparator
U1 and the second voltage comparator U2 export high level.
The overvoltage undervoltage detection circuit of the present embodiment Switching Power Supply can be that live wire occurs with zero line in air-conditioning assembling process
Safeguard protection, while switching power source chip, rectifier circuit and input electrolysis electricity in protection switch power supply are provided during reversal connection
Hold；Also, the overvoltage undervoltage detection circuit of the present embodiment Switching Power Supply is due to that can set over-pressed hysteresis voltage and under-voltage return difference
Voltage, i.e. the present embodiment can in voltage ripple of power network will not false triggering Switching Power Supply over-voltage protecting function and under-voltage protection
Function, and then drastically increase the reliability of Switching Power Supply.
The utility model also provides a kind of Switching Power Supply, and the Switching Power Supply includes the over-and under-voltage detection electricity of Switching Power Supply
Road, the structure of the overvoltage undervoltage detection circuit of the Switching Power Supply can refer to above-described embodiment, will not be repeated here.Naturally
Ground, because the Switching Power Supply of the present embodiment employs the technical scheme of the overvoltage undervoltage detection circuit of above-mentioned Switching Power Supply, therefore
The Switching Power Supply has all beneficial effects of the overvoltage undervoltage detection circuit of above-mentioned Switching Power Supply.
Preferred embodiment of the present utility model is these are only, not thereby limits the scope of the claims of the present utility model, it is every
The equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or be directly or indirectly used in
Other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (7)
- A kind of 1. overvoltage undervoltage detection circuit of Switching Power Supply, it is characterised in that the over-and under-voltage detection electricity of the Switching Power Supply Road includes：Input, for inputting detected voltage；Over-voltage detection circuit unit, for setting over-pressed hysteresis voltage and according to the overvoltage protection hysteresis voltage to described defeated The voltage for entering end carries out over-pressed detection；Undervoltage detection circuit unit, for setting under-voltage hysteresis voltage and according to the under-voltage hysteresis voltage to the input Voltage carry out under-voltage detection；Output end, for exporting overvoltage/undervoltage protection signal；The detection input of the over-voltage detection circuit unit and the detection input of the undervoltage detection circuit unit are and institute State input connection, the detection output of the detection output of the over-voltage detection circuit unit and the undervoltage detection circuit unit End is connected with the output end.
- 2. the overvoltage undervoltage detection circuit of Switching Power Supply as claimed in claim 1, it is characterised in that the over-voltage detection circuit Unit includes operating voltage input, reference voltage input terminal, first resistor, second resistance, 3rd resistor, first voltage and compared Device, the first diode and over-pressed hysteresis voltage set circuit subelement；Wherein：The first end of the first resistor be the over-voltage detection circuit unit detection input, the first of the first resistor End is connected with the input, the second end of the first resistor respectively with the inverting input of the first voltage comparator and The first end connection of the second resistance；The second end ground connection of the second resistance；The first voltage comparator it is same mutually defeated Enter end and circuit the subelement output end with the first voltage comparator and the ginseng respectively are set through the over-pressed hysteresis voltage Voltage input end connection is examined, the output end of the first voltage comparator also inputs through the 3rd resistor and the operating voltage End connection, the negative electrode of the output end of the first voltage comparator also with first diode are connected；First diode Anode be the over-voltage detection circuit unit detection output, the anode of first diode with it is described it is under-voltage detection electricity Road unit connection, the anode of first diode are also connected with the output end；The power supply of the first voltage comparator is just End is connected with the operating voltage input, the power supply negative terminal ground connection of the first voltage comparator.
- 3. the overvoltage undervoltage detection circuit of Switching Power Supply as claimed in claim 2, it is characterised in that the over-pressed hysteresis voltage Circuit subelement is set to include the 4th resistance and the 5th resistance；Wherein：The first end of 4th resistance is connected with the in-phase input end of the first voltage comparator, and the of the 4th resistance Two ends are connected with the first end of the 5th resistance and the reference voltage input terminal respectively；Second end of the 5th resistance with The output end connection of the first voltage comparator.
- 4. the overvoltage undervoltage detection circuit of Switching Power Supply as claimed in claim 2, it is characterised in that the undervoltage detection circuit Unit includes the 6th resistance, the 7th resistance, second voltage comparator, the second diode and under-voltage hysteresis voltage and sets circuit single Member；Wherein：The first end of 6th resistance be the undervoltage detection circuit unit detection input, the first of the 6th resistance End is connected with the input, the second end of the 6th resistance respectively with the in-phase input end of the second voltage comparator and The under-voltage hysteresis voltage sets the connection of circuit subelement；The inverting input of the second voltage comparator is with described with reference to electricity Input connection is pressed, the output end of the second voltage comparator connects through the 7th resistance and the operating voltage input Connect, the negative electrode of the output end of the second voltage comparator also with second diode is connected；The sun of second diode The detection output of extremely described undervoltage detection circuit unit, the anode of second diode and the over-voltage detection circuit list The anode connection of first diode described in member, the anode of second diode are also connected with the output end；Described second The power positive end of voltage comparator is connected with the operating voltage input, and the power supply negative terminal of the second voltage comparator connects Ground.
- 5. the overvoltage undervoltage detection circuit of Switching Power Supply as claimed in claim 4, it is characterised in that the under-voltage hysteresis voltage Circuit subelement is set to include the 8th resistance and the 9th resistance；Wherein：The first end of 8th resistance respectively with the second end of the 6th resistance and the same phase of the second voltage comparator Input connects, the second end ground connection of the 8th resistance；The first end of 9th resistance and the second voltage comparator In-phase input end connection, the second end of the 9th resistance is connected with the output end of the second voltage comparator.
- 6. the overvoltage undervoltage detection circuit of the Switching Power Supply as described in claim 4 or 5, it is characterised in that the Switching Power Supply Overvoltage undervoltage detection circuit also include the 3rd diode, the anode of the 3rd diode is connected with the output end, described The negative electrode of 3rd diode is connected with the inverting input of second voltage comparator described in the undervoltage detection circuit unit.
- 7. a kind of Switching Power Supply, it is characterised in that the Switching Power Supply includes the switch any one of claim 1 to 6 The overvoltage undervoltage detection circuit of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720808297.3U CN207007931U (en) | 2017-07-05 | 2017-07-05 | The overvoltage undervoltage detection circuit and Switching Power Supply of Switching Power Supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720808297.3U CN207007931U (en) | 2017-07-05 | 2017-07-05 | The overvoltage undervoltage detection circuit and Switching Power Supply of Switching Power Supply |
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|---|---|
| CN207007931U true CN207007931U (en) | 2018-02-13 |
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| CN201720808297.3U Active CN207007931U (en) | 2017-07-05 | 2017-07-05 | The overvoltage undervoltage detection circuit and Switching Power Supply of Switching Power Supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196109A (en) * | 2018-03-16 | 2018-06-22 | 南方电网科学研究院有限责任公司 | Circuit for monitoring power supply voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108196109A (en) * | 2018-03-16 | 2018-06-22 | 南方电网科学研究院有限责任公司 | Circuit for monitoring power supply voltage |
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| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231219 Address after: No. 9, Tuanjie Street, Dongxihu District, Wuhan, Hubei 430,040 Patentee after: TCL AIR CONDITIONER WUHAN Co.,Ltd. Address before: 528427, Zhongshan, Guangdong province Nantou town head road Patentee before: TCL AIR CONDITIONER (ZHONGSHAN) Co.,Ltd. |
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| TR01 | Transfer of patent right |