CN106501737A - Switching Power Supply test device - Google Patents
Switching Power Supply test device Download PDFInfo
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- CN106501737A CN106501737A CN201610891503.1A CN201610891503A CN106501737A CN 106501737 A CN106501737 A CN 106501737A CN 201610891503 A CN201610891503 A CN 201610891503A CN 106501737 A CN106501737 A CN 106501737A
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- power supply
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- electric capacity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- Testing Electric Properties And Detecting Electric Faults (AREA)
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Abstract
The present invention discloses a kind of Switching Power Supply test device, including pulse output unit, switch element, resistive load unit and interface end, the outfan of pulse output unit is connected with the controlled end of switch element, the output head grounding of switch element, the input of switch element is connected with the outfan of resistive load unit, and the input of resistive load unit is connected with interface end.Technical solution of the present invention reduces the electric energy that Switching Power Supply is consumed in test process.
Description
Technical field
The present invention relates to Switching Power Supply test device technical field, more particularly to a kind of Switching Power Supply test device.
Background technology
As the peak because of audio signal occurs in Switching Power Supply during powering to audio-frequency power amplifier, often
The situation that value power is too high and causes Switching Power Supply to open overload protection.Therefore, supply to audio-frequency power amplifier in Switching Power Supply
Before electricity, need to carry out overload protection test to Switching Power Supply.
Existing Switching Power Supply test device is tested out by exporting lasting full signal to audio-frequency power amplifier
Whether the threshold power for closing electric power starting overload protection is qualified.So, in test process, Switching Power Supply persistently gives Switching Power Supply
Test device is powered, and wastes electric energy.
Content of the invention
The main object of the present invention is to provide a kind of Switching Power Supply test device, it is intended to reduce test Switching Power Supply output
The electric energy consumed during whether threshold power is qualified.
For achieving the above object, Switching Power Supply test device proposed by the present invention include pulse output unit, switch element,
Resistive load unit and interface end, the outfan of the pulse output unit are connected with the controlled end of the switch element, described
The output head grounding of switch element, the input of the switch element are connected with the outfan of the resistive load unit, described
The input of resistive load unit is connected with the interface end.
Preferably, the pulse output unit was used for exporting the cycle for 10 seconds, and high level lasting time is 10 milliseconds of arteries and veins
Rush signal.
Preferably, the resistive load unit includes load resistance, and the first end of the load resistance is described resistive negative
The input of carrier unit, the second end of the load resistance are the outfan of the resistive load unit.
Preferably, the load resistance is adjustable resistance.
Preferably, the switch element includes first switch pipe, and the controlled end of the first switch pipe is single for the switch
The controlled end of unit, the input of the first switch pipe is the input of the switch element, the output of the first switch pipe
Hold the outfan for the switch element.
Preferably, the pulse output unit includes that rectangle wave generation circuit and monostable circuit, the square wave are produced
The outfan of circuit is connected with the input of the monostable circuit, and the outfan of the monostable circuit is exported for the pulse
The outfan of unit.
Preferably, the rectangle wave generation circuit includes the first power supply, the one 555 chip, the first potentiometer, the first electricity
Resistance, second resistance, the first electric capacity and the second electric capacity, the input of 8 feet, 4 feet and first potentiometer of the one 555 chip
End is connected with first power supply；The outfan of first potentiometer is connected with the first end of the first resistor, described
The 7 feet connection at the second end of first resistor, the first end of the second resistance and the one 555 chip, the one 555 core
The first end interconnection of 2 feet of piece, 6 feet, the second end of the second resistance and first electric capacity, the 5 of the one 555 chip
Foot is connected with the first end of second electric capacity, the second end of first electric capacity, the second end of second electric capacity and described
1 foot of the one 555 chip is grounded, and 3 feet of the one 555 chip are the outfan of the rectangle wave generation circuit.
Preferably, the monostable circuit include second source, the 2nd 555 chip, the second potentiometer, 3rd resistor,
Four resistance, the 3rd electric capacity and the 4th electric capacity, the first end of 8 feet, 4 feet and the 3rd resistor of the 2nd 555 chip with
The second source connection, 2 feet of the 2nd 555 chip are the input of the monostable circuit, the 2nd 555 chip
5 feet, the first end of the 3rd electric capacity and second potentiometer input interconnection, the outfan of second potentiometer
It is connected with the first end of the 4th resistance, 6 feet of the 2nd 555 chip, 7 feet, the second end of the 3rd resistor and institute
State the first end interconnection of the 4th electric capacity, 1 foot of the 2nd 555 chip, the second end of the 3rd electric capacity, the 4th resistance
The second end and the second end of the 4th electric capacity be grounded, 3 feet of the 2nd 555 chip are the defeated of the monostable circuit
Go out end.
Preferably, the monostable circuit also includes the first diode, the 5th resistance and the 6th resistance, the one or two pole
The first end of the negative electrode of pipe and the 5th resistance is connected with 3 feet of the 2nd 555 chip, the sun of first diode
The first end interconnection of pole, the second end of the 5th resistance and the 6th resistance, its connecting node is the monostable circuit
Outfan, the 6th resistance the second end ground connection.
Preferably, the pulse output unit also includes the 3rd power supply, the second diode, the 7th resistance and the 5th electric capacity,
The first end of the 5th electric capacity is connected with the outfan of the rectangle wave generation circuit, the second end of the 5th electric capacity, institute
The second end for stating the anode and the 7th resistance of the second diode is connected with the input of the monostable circuit, and described
The first end of the negative electrode of two diodes and the 7th resistance is connected with the 3rd power supply.
Technical solution of the present invention by using pulse output unit output pulse signal controlling switch unit unlatching with
Shut-off so that resistive load unit intermittently exports peak power, can avoid Switching Power Supply test device continuous drain, drop
Low Switching Power Supply consumes electric energy in test process.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the high-level schematic functional block diagram of one embodiment of Switching Power Supply test device of the present invention；
Fig. 2 is the electrical block diagram of one embodiment of Switching Power Supply test device of the present invention；
Fig. 3 is the waveform diagram of the pulse signal of pulse output unit output in Fig. 2；
Fig. 4 is the equivalent circuit structure schematic diagram of 555 chips in the present invention.
Drawing reference numeral explanation：
| Label | Title | Label | Title | Label | Title |
| 100 | Pulse output unit | C1 | First electric capacity | R1 | First resistor |
| 200 | Switch element | C2 | Second electric capacity | R2 | Second resistance |
| 300 | Resistive load unit | C3 | 3rd electric capacity | R3 | 3rd resistor |
| 110 | Rectangle wave generation circuit | C4 | 4th electric capacity | R4 | 4th resistance |
| 120 | Monostable circuit | C5 | 5th electric capacity | R5 | 5th resistance |
| U1 | One 555 chip | D1 | First diode | R6 | 6th resistance |
| U2 | 2nd 555 chip | D2 | Second diode | R7 | 7th resistance |
| W1 | First potentiometer | Q1 | First switch pipe | RL | Load resistance |
| W2 | Second potentiometer | IN | Interface end |
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
Accompanying drawing in below in conjunction with the embodiment of the present invention, to the embodiment of the present invention in technical scheme carry out clear, complete
Site preparation is described, it is clear that described embodiment a part of embodiment only of the invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made all its
His embodiment, belongs to the scope of protection of the invention.
In addition, the description for being related to " first ", " second " etc. in the present invention is only used for describing purpose, and it is not intended that referring to
Show or imply its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", "
Two " feature can be expressed or implicitly include at least one this feature.In addition, the technical scheme between each embodiment can
To be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when the combination of technical scheme occurs
Conflicting or will be understood that the combination of this technical scheme is not present when cannot realize, also not in the protection model of application claims
Within enclosing.
The present invention proposes a kind of Switching Power Supply test device.The Switching Power Supply test device being capable of analogue audio frequency power amplification
Device exports peak power, also, during testing to Switching Power Supply, if Switching Power Supply opens the thresholding of overload protection
With the difference of the peak power of Switching Power Supply test device output, power illustrates that in allowed band, then Switching Power Supply test is closed
Lattice.
With reference to Fig. 1, in one embodiment, above-mentioned Switching Power Supply test device includes pulse output unit 100, switch element
200th, resistive load unit 300 and interface end IN, the outfan of pulse output unit 100 are connected with the controlled end of switch element 200
Connect, the output head grounding of switch element 200, the input of switch element 200 are connected with the outfan of resistive load unit 300,
The input of resistive load unit 300 is connected with interface end IN.
It should be noted that in the present embodiment, pulse output unit 100 is used for the work of output control switch unit 200
Pulse signal.And when pulse signal is high level, switch element 200 works, when pulse signal is low level, switch element
200 do not work.Wherein, the equivalent resistance of resistive load unit 300 is RL；When switch element 200 works, fall in resistive load
Voltage swing on unit 300 is U.
Additionally, connecting the power output end (not shown) of above-mentioned interface end IN and Switching Power Supply to be tested, so that it may so that
Switching Power Supply is powered to Switching Power Supply test device, opens when powering to audio-frequency power amplifier so as to test out Switching Power Supply
The threshold power of overload protection.
Specifically, with reference to Fig. 3, in the Switching Power Supply test device course of work：
T1 moment, the pulse signal of the output of pulse output unit 100 jump to low level, switch element 200 by high level
Do not work, the voltage in resistive load unit 300 that falls is reduced to zero by U, and the output of Switching Power Supply test device is zero.
At the t2 moment, the pulse signal of the output of pulse output unit 100 is by low transition to high level, switch element 200
Work, the voltage fallen in resistive load unit 300 increase to U by zero, and Switching Power Supply test device exports peak power, and size
For
T3 moment, the pulse signal of the output of pulse output unit 100 jump to low level, switch element 200 by high level
Do not work, the voltage in resistive load unit 300 that falls is reduced to zero by U, and the output of Switching Power Supply test device is zero.
At the t4 moment, the pulse signal of the output of pulse output unit 100 is by low transition to high level, switch element 200
Work.
It is understood that t1～t2 time periods, the output of Switching Power Supply test device is zero, in the process,
Switching Power Supply will not open overload protection.
T2～t3 time periods, the output of Switching Power Supply test deviceIn the process：
If Switching Power Supply opens overload protection, illustrate that Switching Power Supply is opened the threshold power of overload protection and is less than or waits
In P.Hereafter, the equivalent resistance of resistive load unit 300 can be increased, to reduce the output of Switching Power Supply test device.
During the output of Switching Power Supply test device is decreased to (P- Δ P1) from P, if Switching Power Supply still opens overload
Protection, then judge Switching Power Supply test failure；If Switching Power Supply stops opening overload protection, judge that Switching Power Supply test is closed
Lattice.
If Switching Power Supply does not open overload protection, illustrate that Switching Power Supply is opened the threshold power of overload protection and is more than P.This
Afterwards, the equivalent resistance of resistive load unit 300 can be reduced, to increase the output of Switching Power Supply test device.In switch
During the output of power supply testing device increases to (P+ Δ P2) from P, if Switching Power Supply does not still open overload protection,
Then judge Switching Power Supply test failure；If Switching Power Supply opens overload protection, Switching Power Supply test passes are judged.
It is noted that in the present embodiment, the peak power of Switching Power Supply test device output includes (P- Δ P1) extremely
All power between (P+ Δ P2).Wherein, Δ P1 can be with equal with Δ P2, it is also possible to unequal, is not limited herein.Typically
, Δ P1 is less than Δ P2；Especially, Δ P1=Δs P2=0.
It is understood that in the present embodiment, peak power and Audio power amplifier that Switching Power Supply test device is exported
The peak power size of device output is approximate, when Switching Power Supply test device exports peak power：If Switching Power Supply opens overload
Protection, then, when audio-frequency power amplifier exports peak power, Switching Power Supply also opens overload protection；Same reason, if open
Powered-down source is not turned on overload protection, then, when audio-frequency power amplifier exports peak power, Switching Power Supply is also not turned on overload and protects
Shield.Therefore, Switching Power Supply test device proposed by the present invention can be tested Switching Power Supply and powered to audio-frequency power amplifier
Whether Cheng Zhong, the threshold power for opening overload protection are qualified.
Technical solution of the present invention has the advantages that：
(1) pulse signal of the output of pulse output unit 100 is intermittent, and Switching Power Supply test device can be avoided to hold
Continuous power consumption.
(2) when the power that resistive load unit 300 is consumed increases to (P+ Δ P2), if Switching Power Supply does not open overload protecting
Shield, then judge Switching Power Supply test failure.So, after the completion of test, Switching Power Supply that threshold power can be avoided excessive
Power to audio-frequency power amplifier.
It is noted that when above-mentioned pulse signal is periodic signal, its cycle between 1 second to 10 seconds, high level
Persistent period is between 1 millisecond to 10 milliseconds.So, the frequency of Switching Power Supply test device output peak power and audio power
The frequency of amplifier output peak power is also approximate, can further improve the reliability of test result.
With reference to Fig. 2, in one embodiment, above-mentioned resistive load unit 300 includes load resistance RL, the of load resistance RL
Input of the one end for resistive load unit 300, second end of load resistance RL are the outfan of resistive load unit 300.
Wherein, above-mentioned load resistance RL can be potentiometer, or sensor, and such as, critesistor is not done herein
Limit.When above-mentioned load resistance RL is sensor, whether overload protection can be opened to load resistance RL according to Switching Power Supply
Accordingly controlled, to change the resistance of load resistance RL.
With reference to Fig. 2, in one embodiment, above-mentioned switch element 200 includes first switch pipe Q1, preferably, first switch
Pipe Q1 is managed for N-MOS, and the grid of N-MOS pipes is the controlled end of switch element 200, and the source electrode of N-MOS pipes is switch element 200
Input, the drain electrode of N-MOS pipes are the outfan of switch element 200.Easy to understand, N-MOS pipes can use NPN type triode generation
Replace, however, comparatively speaking, N-MOS pipes have less internal resistance, can reduce the power attenuation of switch element 200, strengthen and survey
The reliability of test result.
With reference to Fig. 2, in one embodiment, above-mentioned pulse output unit 100 includes rectangle wave generation circuit 110 and monostable
Circuit 120, the outfan of rectangle wave generation circuit 110 are connected with the input of monostable circuit 120, monostable circuit 120
Outfan of the outfan for pulse output unit 100.It is understood that pulse output unit 100 can also be other circuits
Structure, such as, pulse output unit includes sawtooth wave generating circuit (not shown), agitator (not shown) and comparator
(not shown), the outfan of sawtooth wave generating circuit are connected with the in-phase input end of comparator, the outfan of agitator with than
Connect compared with the inverting input of device, the outfan of comparator is the outfan of pulse output unit.Herein to pulse output unit
100 circuit structure is not limited.It is preferred that above-mentioned rectangle wave generation circuit 110 and monostable circuit 120 are all by 555 chips
And corresponding discrete component is constituted, the equivalent circuit structure of 555 chips refer to Fig. 4.
Specifically, with reference to Fig. 2, above-mentioned rectangle wave generation circuit 110 include the first power supply (VCC as shown in Figure 1), first
555 chip U1, the first potentiometer W1, first resistor R1, second resistance R2, the first electric capacity C1 and the second electric capacity C2, the one 555 core
The input of 8 feet of piece U1,4 feet and the first potentiometer W1 is connected with the first power supply；The outfan of the first potentiometer W1 and
The first end connection of one resistance R1, the 7 of the second end of first resistor R1, the first end of second resistance R2 and the one 555 chip U1
Foot connects, the first end interconnection of 2 feet of the one 555 chip U1,6 feet, the second end of second resistance R2 and the first electric capacity C1, and first
5 feet of 555 chip U1 are connected with the first end of the second electric capacity C2, second end of the first electric capacity C1, second end of the second electric capacity C2
And the 1st 1 foot of chip U1 be grounded, the outfan of 3 feet of the one 555 chip U1 for rectangle wave generation circuit 110.
It should be noted that in the present embodiment, if the first supply voltage size is VCC, the resistance of the first potentiometer W1 is
W1, the resistance of first resistor R1 is R1, and the resistance of second resistance R2 is R2, and the capacity of the first electric capacity C1 is C1；
Then, rectangle wave generation circuit 110 output square wave cycle be T=ln2 (W1+R1+2R2) × C1, high level
Persistent period is td=ln2 (W1+R1) × C1.Change the resistance of the first potentiometer W1, you can change rectangle wave generation circuit 110
The cycle of the square wave of output.
Wherein, the running of rectangle wave generation circuit 110 is as follows：
After connecting the first power supply, the voltage because falling in the first electric capacity C1 can not be mutated, rest-set flip-flop (RS as shown in Figure 3
Trigger) SM set mode is in, and low level is exported, the 3 feet output high level of the one 555 chip U1.At the same time, first put
Fulgurite VT1 ends, and the first electric capacity C1 is charged by the first potentiometer W1, first resistor R1 and second resistance R2, falls in the first electricity
The voltage for holding C1 is exponentially raised.
When rising to (2/3) VCC when falling in the voltage of the first electric capacity C1, first comparator A1 output switching activity, rest-set flip-flop are put
Position, and high level is exported, the 3 feet output low level of the one 555 chip U1.At the same time, the first discharge tube VT1 conductings, first
Electric capacity C1 is discharged by second resistance R2 and the first discharge tube VT1.
When being down to (1/3) VCC when falling in the voltage of the first electric capacity C1, the second comparator A2 output switching activities, rest-set flip-flop are multiple
Position, and low level is exported, the 3 feet output high level of the one 555 chip U1.
Above procedure repeats, and 3 feet of the one 555 chip U1 can just export square wave.
Above-mentioned monostable circuit 120 includes second source (VCC as shown in Figure 1), the 2nd 555 chip U2, the second current potential
Device W2,3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3 and the 4th electric capacity C4,8 feet of the 2nd 555 chip U2,4 feet and
The first end of three resistance R3 is connected with second source, and 2 feet of the 2nd 555 chip U2 are the input of monostable circuit 120, the
The input interconnection of 5 feet, the first end of the 3rd electric capacity C3 and the second potentiometer W2 of 2 555 chip U2, the second potentiometer W2's
Outfan is connected with the first end of the 4th resistance R4,6 feet of the 2nd 555 chip U2,7 feet, the second end of 3rd resistor R3 and
The first end interconnection of four electric capacity C4,1 foot of the 2nd 555 chip U2, second end of the 3rd electric capacity C3, second end of the 4th resistance R4
And the 4th second end of electric capacity C4 be grounded, the outfan of 3 feet of the 2nd 555 chip U2 for monostable circuit 120.
It should be noted that in the present embodiment, if second source voltage swing is VCC, the resistance of the second potentiometer W2 is
W2, the resistance of 3rd resistor R3 is R3, and the resistance of the 4th resistance R4 is R4, and the capacity of the 4th electric capacity C4 is C4；
Then, the pulse signal pulsewidth of the output of monostable circuit 120 is tw=-R3 × C4 × ln (1-VX/VCC2)；Wherein
VX/VCC2=Rp/ (Rp+5K Ω)；Rp=10 (W2+R4)/(W2+R4+10) K Ω.Change the resistance of the second potentiometer W2, you can
Change the pulsewidth of the pulse signal of the output of monostable circuit 120.
Wherein, the running of monostable circuit 120 is as follows：
After connecting second source, because of Triggerless, rest-set flip-flop exports high level, the 3 feet output of the 2nd 555 chip U2
Low level.At the same time, the first discharge tube VT1 conductings, the voltage in 7 feet and 6 feet of the 2nd 555 chip U2 that falls are zero.
When 2 feet of the 2nd 555 chip U2 receive the negative-going pulse less than (1/3) VCC, the second comparator A2 outputs are turned over
Turn, rest-set flip-flop exports low level, the 3 feet output high level of the 2nd 555 chip U2.At the same time, the first discharge tube VT1 cuts
Only, the 4th electric capacity C4 is charged by 3rd resistor R3, and the voltage in the 4th electric capacity C4 that falls exponentially rises.
It is noted that when 2 feet of the 2nd 555 chip U2 add the negative-going pulse higher than (1/3) VCC, although the
Two comparator A2 output switching activities, but the output of rest-set flip-flop remains in that constant, and 3 feet of the 2nd 555 chip U2 are still exported
High level.
When rising to (2/3) VCC when falling in the voltage of the 4th electric capacity C4, first comparator A1 output switching activity, rest-set flip-flop quilt
Reset, and export high level, the 3 feet output low level of the 2nd 555 chip U2.At the same time, the first discharge tube VT1 conductings, the
Four electric capacity C4 discharge through the first discharge tube VT1.
Until 2 feet of the 2nd 555 chip U2 receive the negative-going pulse less than (1/3) VCC again, monostable circuit
120 repeat above-mentioned running.So, pulse signal is just outputed.
Further, with reference to Fig. 2, above-mentioned monostable circuit 120 also includes the first diode D1, the 5th resistance R5 and the 6th
The first end of the negative electrode and the 5th resistance R5 of resistance R6, the first diode D1 is connected with 3 feet of the 2nd 555 chip U2, and first
The first end interconnection of the anode of diode D1, second end of the 5th resistance R5 and the 6th resistance R6, its connecting node is monostable
The outfan of circuit 120, the second end ground connection of the 6th resistance R6.
In the present embodiment, the 5th resistance R5 and the 6th resistance R6 constitutes bleeder circuit, arranges the first diode D1 and the 5th
Resistance R5 is connected in parallel, and can be fallen in the voltage at the 5th resistance R5 two ends with clamper, and then increases the output electricity of monostable circuit 120
Pressure.
With reference to Fig. 2, in one embodiment, above-mentioned pulse output unit 100 also includes that the 3rd power supply is (as shown in Figure 1
VCC), the second diode D2, the 7th resistance R7 and the 5th electric capacity C5, the first end of the 5th electric capacity C5 and rectangle wave generation circuit
110 outfan connection, second end at second end of the 5th electric capacity C3, the anode of the second diode D2 and the 7th resistance R7 with
The input connection of monostable circuit 120, the first end of the negative electrode and the 7th resistance R7 of the second diode D2 with the 3rd power supply
Connection.
In the present embodiment, the 7th resistance R7 and the 5th electric capacity C5 constitutes peaker, and the peaker can shorten input
Pulsewidth to the trigger of monostable circuit 120.Second diode D2 believes can the triggering of input to monostable circuit 120
Number amplitude less than monostable circuit 120 supply voltage.
Hereinafter, the operation principle of Switching Power Supply test device of the present invention, in conjunction with Fig. 1 to Fig. 4, is described：
Rectangle wave generation circuit 110 and monostable circuit 120 are accessed corresponding power supply：
When monostable circuit 120 is not received by the trailing edge signal of the output of rectangle wave generation circuit 110, monostable electricity
Road 120 exports low level, and first switch pipe Q1 ends, and the output of load resistance RL is zero.
When monostable circuit 120 receives the trailing edge signal of the output of rectangle wave generation circuit 110, monostable circuit
120 output high level, first switch pipe Q1 are turned on, and load resistance RL exports peak power.In the process, the second current potential is adjusted
The resistance of device W2, can adjust the pulsewidth of the pulse signal of the output of monostable circuit 120, and then the access of regulating load resistance RL
Time.
When monostable circuit 120 receives the trailing edge signal of the output of rectangle wave generation circuit 110 again, monostable
Circuit 120 exports high level again, and first switch pipe Q1 is turned on again, and load resistance RL exports peak power again.Here mistake
Cheng Zhong, adjusts the resistance of the first potentiometer W1, occurs peak twice before and after the pulse signal that can adjust the output of monostable circuit 120
The interval time of value.
The resistance of regulating load resistance RL, repeats said process.If Switching Power Supply opens the threshold power of overload protection
Scope then judges Switching Power Supply test passes, otherwise, Switching Power Supply test failure at (P- Δ P1) between (P+ Δ P2).
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the present invention is not thereby limited, every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
In the scope of patent protection that other related technical fields are included in the present invention.
Claims (10)
1. a kind of Switching Power Supply test device, it is characterised in that including pulse output unit, switch element, resistive load unit
And interface end, the outfan of the pulse output unit is connected with the controlled end of the switch element, the switch element defeated
Go out end ground connection, the input of the switch element is connected with the outfan of the resistive load unit, the resistive load unit
Input be connected with the interface end.
2. Switching Power Supply test device as claimed in claim 1, it is characterised in that the pulse output unit is used for exporting week
Phase is 10 seconds, and high level lasting time is 10 milliseconds of pulse signal.
3. Switching Power Supply test device as claimed in claim 1, it is characterised in that the resistive load unit includes load electricity
Resistance, the first end of the load resistance are the input of the resistive load unit, and the second end of the load resistance is described
The outfan of resistive load unit.
4. Switching Power Supply test device as claimed in claim 3, it is characterised in that the load resistance is adjustable resistance.
5. Switching Power Supply test device as claimed in claim 1, it is characterised in that the switch element includes first switch
Pipe, the controlled end of the first switch pipe is the controlled end of the switch element, and the input of the first switch pipe is described
The input of switch element, the outfan of the first switch pipe is the outfan of the switch element.
6. Switching Power Supply test device as claimed in claim 1, it is characterised in that the pulse output unit includes square wave
Circuit and monostable circuit is produced, the outfan of the rectangle wave generation circuit is connected with the input of the monostable circuit,
The outfan of the monostable circuit is the outfan of the pulse output unit.
7. Switching Power Supply test device as claimed in claim 6, it is characterised in that the rectangle wave generation circuit includes first
Power supply, the one 555 chip, the first potentiometer, first resistor, second resistance, the first electric capacity and the second electric capacity, the described 1st
The input of 8 feet of chip, 4 feet and first potentiometer is connected with first power supply；First potentiometer defeated
Go out end to be connected with the first end of the first resistor, the second end of the first resistor, the first end of the second resistance and institute
State the 7 feet connection of the one 555 chip, 2 feet of the one 555 chip, 6 feet, the second end of the second resistance and described the
The first end interconnection of one electric capacity, 5 feet of the one 555 chip are connected with the first end of second electric capacity, first electricity
1 foot at the second end, the second end of second electric capacity and the one 555 chip that hold is grounded, the one 555 chip
3 feet are the outfan of the rectangle wave generation circuit.
8. Switching Power Supply test device as claimed in claim 6, it is characterised in that the monostable circuit includes the second electricity
Source, the 2nd 555 chip, the second potentiometer, 3rd resistor, the 4th resistance, the 3rd electric capacity and the 4th electric capacity, the 2nd 555 core
The first end of 8 feet, 4 feet and the 3rd resistor of piece is connected with the second source, and 2 feet of the 2nd 555 chip are
The input of the monostable circuit, 5 feet of the 2nd 555 chip, the first end of the 3rd electric capacity and second electricity
The input interconnection of position device, the outfan of second potentiometer are connected with the first end of the 4th resistance, and the described 2nd 555
The first end interconnection of 6 feet of chip, 7 feet, the second end of the 3rd resistor and the 4th electric capacity, the 2nd 555 chip
1 foot, the second end of the 3rd electric capacity, the second end of the 4th resistance and the second end of the 4th electric capacity be grounded,
3 feet of the 2nd 555 chip are the outfan of the monostable circuit.
9. Switching Power Supply test device as claimed in claim 6, it is characterised in that the monostable circuit also includes the one or two
The first end of pole pipe, the 5th resistance and the 6th resistance, the negative electrode of first diode and the 5th resistance is with described
The 3 feet connection of 2 555 chips, the anode of first diode, the second end of the 5th resistance and the 6th resistance
First end is interconnected, and its connecting node is the outfan of the monostable circuit, the second end ground connection of the 6th resistance.
10. the Switching Power Supply test device as described in claim 6-9 any one, it is characterised in that the pulse output is single
Unit also includes the 3rd power supply, the second diode, the 7th resistance and the 5th electric capacity, the first end of the 5th electric capacity and the rectangle
The outfan connection of wave generation circuit, the second end of the 5th electric capacity, the anode of second diode and the 7th electricity
Second end of resistance is connected with the input of the monostable circuit, the negative electrode of second diode and the 7th resistance
First end is connected with the 3rd power supply.
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| CN108254701A (en) * | 2017-12-25 | 2018-07-06 | 南通同洲电子有限责任公司 | One kind can test Switching Power Supply |
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