CN103795277B - There is power supply unit and the control method thereof of output protecting function - Google Patents

There is power supply unit and the control method thereof of output protecting function Download PDF

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Publication number
CN103795277B
CN103795277B CN201210425374.9A CN201210425374A CN103795277B CN 103795277 B CN103795277 B CN 103795277B CN 201210425374 A CN201210425374 A CN 201210425374A CN 103795277 B CN103795277 B CN 103795277B
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output
protection
power supply
value
supply unit
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CN201210425374.9A
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Chinese (zh)
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CN103795277A (en
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陈伟达
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康舒科技股份有限公司
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Abstract

The invention provides a kind of power supply unit and control method thereof with output protecting function, mainly before a default overcurrent protection value, set more than one preposition protection value, when the output current of power supply unit exceedes preposition protection value, but before not reaching overcurrent protection value, first judge whether power supply unit has other unusual condition, if without getting back to initial step, extremely allow power supply unit can suspend output if having with automatically replying; If the output current of power supply unit further exceedes overcurrent protection value, start overcurrent protection; Utilize above-mentioned multiple monitoring technology to provide suitable overcurrent protection to the output of power supply unit, owing to need not improving the specification of power supply unit, build cost therefore can reduce the power supply of load end.

Description

There is power supply unit and the control method thereof of output protecting function

Technical field

The present invention relates to a kind of power supply unit and control method thereof, particularly relate to suitably specification of oneThe correlation technique of power supply unit output overcurrent protection is provided.

Background technology

Be illustrated in figure 4 a kind of existing power supply unit, it comprise a rectification circuit 81, a power because ofNumber correcting circuit 82, a transformer 83, an output circuit 84, a power switch 85, a PWM controlDevice 86 processed, a feedback circuit 87 and a microprocessor 88; Wherein:

The input of output circuit 84 is connected with transformer 83 secondary sides, and the output of output circuit 84Be connected with load (as server system); This power switch 85 is connected with the primary side of transformer 83, andDriven by PWM controller 86, whether to control output circuit 84 to load supplying; This pulsewidth is adjustedBecome controller 86 and be connected with the output of output circuit 84 by feedback circuit 87, to obtain output electricityPress.

This microprocessor 88 has an output electric current measure end Cs1, a warning message output IO1 andOutput; Its output electric current measure end Cs1 is the output with output circuit 84 by a differential amplifier 89Connect, to obtain output current, it is one defeated that the output that is further specifically configured to output circuit 84 hasGo out resistance R s1, the two ends of output resistance Rs1 are connected with two inputs of differential amplifier 89 respectively, poorThe output of moving amplifier 89 is connected to the output electric current measure end Cs1 of microprocessor 88, this micro-processingDevice 88 can be obtained by differential amplifier 89 current value of output current then, and the warning of microprocessor 88Information output IO1 and output are connected with load, PWM controller 86 respectively.

Aforementioned power source supply has output protecting function, generally takes by overcurrent protection, and as described in front taking off,Microprocessor 88 can be obtained output current from the output of output circuit 84 by differential amplifier 89,For example, when output current exceedes rated current to preset proportion (125%), arrive overcurrent protection point,Now microprocessor 88 will cut out PWM controller 86, and output circuit 84 is stopped load supplying,And simultaneously by warning message output IO1 notification payload, the electric current being extracted by power supply unit when load lower thanOvercurrent protection point, power supply unit just can be restarted and supply power supply.

Although above-mentioned technology can reach overcurrent protection, however for the manufacturer of power supply unitMust be very careful when design alternative overcurrent protection point, too high because of the design of overcurrent protection point, will cause electricityThe probability that source supply damages and load system damages improves, and overcurrent protection point is too low cannot bring into play protectionThe effect of power supply unit and load system.

In addition, output current when power supply unit start is larger, easily approaches even higher than overcurrent protectionPoint, but normality can not exceed overcurrent protection point while using, but when avoiding starting shooting false touch overcurrent protectionAnd impact power supply is stable, the curent change must yield to start when user chooses power supply unit time and usingThe power supply unit of higher-wattage, it means that adopting the power supply unit of high gauge is only while tackling startShort time demand, lack scope for their abilities after steady state operation, but build the cost of power supply by improving servo-drive system.

Summary of the invention

Therefore main purpose of the present invention is providing a kind of power supply unit and controlling party thereof with output protectionMethod, it can set suitable overcurrent protection point to power supply unit, and before establishing before overcurrent protection pointPut protection point, outside effective execution output protection, because using the power supply unit of higher-wattage, thereforeThe power supply that can reduce load end builds cost.

As the technical way of reaching aforementioned object and taking, make the aforementioned power supply supply with output protectionDevice control method, is mainly and makes a power supply unit carry out following steps:

One overcurrent protection value is provided;

Set a preposition protection value that is less than above aforementioned overcurrent protection value;

Obtain output current, and judge whether output current is more than or equal to preposition protection value;

If output current is greater than preposition protection value and is less than overcurrent protection value, further carry out a temperature differentNormal discriminating program, if temperature anomaly is stopped power supply, nothing is extremely got back to and is obtained output current step;

If output current is more than or equal to overcurrent protection value, carry out overcurrent protection;

Preceding method is mainly before overcurrent protection value, to set more than one preposition protection value, in outputCurrent value is greater than preposition protection value, carries out preposition detection but be less than under the condition of overcurrent protection value, and it enters oneStep judges whether power supply unit occurs other anomaly (for example overheated), if there is anomaly,Temporarily stop power supply; When output current is further greater than overcurrent protection value, side enters overcurrent protection judgementProgram, utilizes above-mentioned technology to provide preposition detection to the overcurrent protection point of power supply unit, to tackle oneA little very state property and of short duration electric current rising situations, not only can guarantee the safety of power supply unit whereby, andOvercurrent protection point can be drawn high to suitable value to the larger electricity while making power supply unit not only can bear startFlow, but need not choose the power supply unit of higher-wattage.

As the another technical way of reaching aforementioned object and taking, aforementioned power source supply is comprised:

One rectification circuit, has an ac power input end and a DC power output end;

One circuit of power factor correction, has an input and an output, its input and rectification circuitDC power output end connects;

One transformer, its primary side is connected with the output of circuit of power factor correction;

One output circuit, has an input and an output, and its input is connected with the secondary side of transformer;

One power switch, is connected with the primary side of transformer;

One PWM controller, has more than one back coupling input and PWM signal outputEnd, its PWM signal output part connects the also keying of power ratio control switch;

One microprocessor, has an output electric current measure end, a warning message output, a temperature signal defeatedEnter end, a lock bolt signal input part and an output; The activation forbidden energy of its output and PWM controllerEnd connects; This microprocessor a default overcurrent protection value;

One current detector, has an input and an output, the output of its input and output circuitConnect, the output of current detector is connected with the output electric current measure end of microprocessor;

One preposition testing circuit, has a current signal input and a lock bolt signal output part, its electric current letterNumber input is connected with the output of current detector, the lock bolt letter of its lock bolt signal output part and microprocessorNumber input connects; This preposition testing circuit provides one be less than but approach the preposition protection of overcurrent protection valueValue, and in the time that the output current of output circuit arrives this preposition protection value, send a police by preposition testing circuitAnnouncement information is to microprocessor;

One Temperature Detector, is located on the temperature signal input of microprocessor;

Above-mentioned power supply unit mainly coordinates preposition testing circuit that output protection is provided by microprocessor, this micro-placeThe default overcurrent protection value of reason device and more than one preposition protection value, and obtain power supply by current detectorThe output current of supply, in the time that output current is greater than preposition protection value but is less than overcurrent protection value, entersOne step is detected the temperature regime of power supply unit by Temperature Detector, if while having excess Temperature situation, by micro-placeReason device sending control signal, to PWM controller, started high temperature protection (OTP), made PWMController temporary close, output circuit is then no longer to load supplying; If output current is not only greater than preposition protectionValue and approach overcurrent protection value, will be detected by preposition testing circuit, and notify microprocessor, microprocessorTo close PWM controller, and notification payload, to reduce and extract after electric current by load, the beginning can be with manual sideFormula is reset to restore electricity. For instance, if being output current, overcurrent protection value exceeds setting value150%, preposition protection value can be made as 130%, when output current is greater than 130%, but is less than 150%, micro-Processor further judges that whether temperature is abnormal, to determine whether started high temperature protection, if temperature does not haveExtremely, represent that it may be of short duration abnormal situation that output current improves, for example, electric current while start raises,Once start shooting, output current can recover normally, and except output current rising, can not cause otherAnomaly (for example rising sharply because overload makes temperature), utilize preposition testing mechanism of the present invention, canGot rid of beyond overcurrent protection, until cause output current further to raise while really transshipping, just enteredEnter overcurrent protection program; Utilize above-mentioned technology, can make power supply unit manufacturer suitable heighten overcurrentProtection value, to avoid false touch overcurrent protection in the time starting shooting, but still can effectively reach the object of output protection.

Brief description of the drawings

Fig. 1 is the circuit block diagram of a preferred embodiment of the present invention;

Fig. 2 is method flow diagram of the present invention;

Fig. 3 is the circuit block diagram of the another preferred embodiment of the present invention;

Fig. 4 is the circuit block diagram of existing power supply supply.

Reference numeral

10: microprocessor 11: rectification circuit

12: circuit of power factor correction 13: transformer

14: output circuit 15: power switch

16: PWM controller 17: current detector

18: Temperature Detector 20: preposition testing circuit

21: comparator 22: lock bolt circuit

23: phase inverter 81: rectification circuit

82: circuit of power factor correction 83: transformer

84: output circuit 85: power switch

86: PWM controller 87: feedback circuit

88: microprocessor 89: differential amplifier

Detailed description of the invention

About a preferred embodiment of power supply unit of the present invention, refer to shown in Fig. 1, mainly by a rectificationCircuit 11, a circuit of power factor correction 12, a transformer 13, an output circuit 14, a power switch15, the composition such as a PWM controller 16, a microprocessor 10, a current detector 17; Wherein:

This rectification circuit 11 has an ac power input end ACin and a DC power output end; This meritRate factor correcting circuit 12 has an input and an output, the direct current of its input and rectification circuit 11Power output end connects; The primary side of this transformer 13 is connected with the output of circuit of power factor correction 12;This output circuit 14 has an input and an output, and its input is connected with the secondary side of transformer 13;This power switch 15 can be a power transistor, and it is connected with the primary side of transformer 13, and is adjusted by pulsewidthBecome controller 16 and control its switch;

This PWM controller 16 has a back coupling input Vs, an activation forbidden energy end(ENABLE/DISABLE) and a PWM signal output part, its PWM signal output part withPower switch 15 connects; This microprocessor 10 has an output electric current measure end Cs1, a warning message is defeatedGo out to hold IO1 and an output, the activation forbidden energy end of its output and PWM controller 16(ENABLE/DISABLE) connect, in order to the use of switch PWM controller 16; Its warning messageOutput IO1 uses with the mainboard of a load and is connected, to notify before PWM controller 16 will be closedThe mainboard of load; In the present embodiment, microprocessor 10 further comprise a temperature signal input Ts1,One lock bolt signal input part, its temperature signal input Ts1 is connected with a Temperature Detector 18, its lock boltSignal input part is connected with current detector 17, and this current detector 17 is mainly by a differential amplifier and oneBe located at the output resistance Rs1 composition on output circuit 14 outputs, two inputs of differential amplifier and defeatedThe two ends that go out resistance R s1 connect, to obtain output current, and the output of differential amplifier and microprocessor10 output electric current measure end Cs1 connects.

Power supply unit of the present invention is further provided with a preposition testing circuit 20 again, in the present embodiment,This preposition testing circuit 20 is mainly made up of a comparator 21 and a lock bolt (Latch) circuit 22, thanThere is a current signal input and an output compared with device 21, its current signal input and current detector17 output connects, and lock bolt circuit 22 has an input and a lock bolt signal output part, its input againEnd is connected with the output of comparator 21, and the lock bolt signal of its lock bolt signal output part and microprocessor 10 is defeatedEntering end connects. Aforementioned comparator 21 is in order to set the early warning value of a convergence overcurrent protection value, so that defeatedWhen going out electric current and approaching overcurrent protection value, send a lock bolt signal to microprocessor 10 by lock bolt circuit 22,Make microprocessor 10 send the mainboard of a warning message to load, and close PWM controller 16 to stopOnly to load supplying.

About the further working method of above-mentioned power supply unit in detail as described below:

Aforementioned microprocessor 10 is set with an overcurrent protection value and more than one preposition protection value, or entersOne step is set a protection threshold value, wherein: protection threshold value is less than preposition protection value, and preposition protection value is less thanOvercurrent protection value, for convenience of description, careful respectively with concrete numerical value proposition explanation, must state:Following numerical value just for example, is not in order to limit the numerical value of its specific implementation; Wherein: overcurrent protection valueBe 150%, preposition protection value 130%, protection threshold value 110%. And preposition holding circuit 20 is setEarly warning value is 148%.

Refer to shown in Fig. 2 about the feasible workflow of microprocessor 10 1, mainly pass through current detectingDevice 17 detects the current value (being output current) (step 201) of output circuit 14 outputs;

Then judge whether output current is more than or equal to 110%(step 202), if be not more than or equal to 110%,Represent that output current, below 110%, does not start any safeguard measure in this stage;

If output current is more than or equal to 110%, further judge whether to be more than or equal to 130%(step 203),When output current is more than or equal to 110%, but while not being more than or equal to 130%, enter one second temperature anomalyDiscriminating program (step 204), to determine whether carried out high temperature protection (OTP); In the present embodiment,This second temperature anomaly discriminating program (step 204) comprising:

Judge that whether temperature is more than or equal to a warning value (step 204A), gets back to if do not exceed warning valueInitial step; Load is sent to a warning message (step 204B) if exceed warning value, be now not related toClose PWM controller 16, and further judge whether temperature is more than or equal to one and crosses high temperature protection value (stepRapid 204C), get back to initial step (step 201) if be not more than or equal to, protected if exceeded high temperatureThe value of protecting, started high temperature protection (OTP) (step 204D). Described high temperature protection (OTP) excessivelyBe by microprocessor 10 temporary close PWM controllers 16, and suspend load supplying; But when electricityThe temperature of source supply declines, and microprocessor 10 will make PWM controller 16 resume work; In other words,Crossing high temperature protection (OTP) is, after power supply unit temperature is recovered normally, can automatically recover normally to workProtection mechanism.

In abovementioned steps 203, if output current is more than or equal to 130%, further judge output currentWhether be more than or equal to 150%(step 205), if be more than or equal to 150%, directly start over current protectionProtect (OCP), alleged overcurrent protection (OCP) is to close PWM control by microprocessor 10Device 16 and stopping load supplying; Although equally stop power supply, high temperature protection (OTP) is different from crossing: overcurrent protection can not recovered automatically, must reset with manual mode, to guarantee safety.

And in abovementioned steps 205, if output current is not more than or equal to 150%, further judgement outputWhether electric current arrives early warning value (148%) (step 206), when output current is more than or equal to 148%,Enter the 3rd temperature anomaly discriminating program (step 207), the 3rd temperature anomaly discriminating program (step207) comprising:

Judge whether temperature exceedes a warning value (step 207A), if do not exceed warning value by micro-processingDevice 10 is reset after preposition holding circuit and is got back to initial step 201; Load is sent to one if exceed warning valueWarning message (step 207B), does not now close PWM controller 16, and further judges temperatureWhether exceed one and cross high temperature protection value (step 207C), get back to initial step 201 if do not exceed, ifExceed high temperature protection value, started high temperature protection (OTP) (step 207D).

And in abovementioned steps (206), if output current is not more than or equal to 148%, enter the first temperature differentNormal discriminating program (208), this first temperature anomaly discriminating program (208) comprising:

Judge whether temperature exceedes a warning value (step 208A), if do not exceed warning value, furtherJudge whether to continue for some time (for example 15ms) (step 208E), get back to initial if do not continueStep 201; Start overcurrent protection if exceed a period of time; In abovementioned steps 208A, if superCross warning value and load is sent to a warning message (step 208B), but do not close PWM controller16, and further judging whether temperature exceedes one and cross high temperature protection value (step 208C), if do not exceedGet back to initial step 201, if exceeded high temperature protection value, started high temperature protection (OTP) (stepRapid 208D).

Can be understood by above-mentioned explanation that the overall structure of power supply unit of the present invention and microprocessor 10 thereof carry outWorkflow, mainly carries out multistage monitoring to the output current of power supply unit, really large at output currentBefore overcurrent protection value, carry out respectively different monitoring guarantors for the ratio that exceedes that output current is differentProtect, so, under situation, not only can reach the object of output protection, and can effectively get rid of temporaryElectric current rising situation (for example, while start), can be beneficial to power supply unit manufacturer whereby by overcurrent protection pointMore than the amplitude that while bringing up to start, output current may raise, for user, need not buy higherThe power supply unit of specification, therefore can reduce the cost that builds of system power supply.

As shown in Figure 3, be the another preferred embodiment of power supply unit of the present invention, its basic framework and lastEmbodiment is roughly the same, difference be in: the lock bolt signal output part of this preposition holding circuit 20 is connected toOutside the lock bolt signal input part of microprocessor 10, be also connected directly to microprocessor via a phase inverter 2310 warning message output. Because the warning message output of microprocessor 10 is to be connected to load mainboard,Once it means that preposition holding circuit 20 confirms that output current has reached the early warning of convergence overcurrent protection valueValue, will be without microprocessor 10 direct notification payload mainboard, strive for whereby time of load mainboard reaction.

Claims (10)

1. a power supply unit control method with output protection, is characterized in that, mainly makes an electricitySource supply is carried out following steps:
One overcurrent protection value is provided;
Set a preposition protection value that is less than above aforementioned overcurrent protection value;
Obtain output current, and judge whether output current is more than or equal to preposition protection value;
If output current is greater than preposition protection value and is less than overcurrent protection value, further carry out a temperature differentNormal discriminating program, if temperature anomaly is stopped power supply, nothing is extremely got back to and is obtained output current step;
If output current is more than or equal to overcurrent protection value, carry out overcurrent protection.
2. the power supply unit control method with output protection according to claim 1, its featureBe, if output current is not more than or equal to overcurrent protection value, further judge whether output current arrivesEarly warning value, when output current is more than or equal to early warning value, enters one the 3rd temperature anomaly discriminating program, and this is years oldThree temperature anomaly discriminating programs comprise:
Judge whether temperature exceedes a warning value, get back to and obtain output current step if do not exceed warning value;Load is sent to a warning message if exceed warning value, now do not stop power supply, and further judge temperatureWhether exceed one and cross high temperature protection value, get back to and obtain output current step if do not exceed, if exceeded too highTemperature protection value, started high temperature protection.
3. the power supply unit control method with output protection according to claim 2, its featureBe, if output current is not more than or equal to early warning value, enter one first temperature anomaly discriminating program, this is first years oldTemperature anomaly discriminating program comprises:
Judge whether temperature exceedes a warning value, if do not exceed warning value, further judge whether to continue oneThe section time, get back to and obtain output current step if do not continue; Start over current protection if exceed a period of timeProtect.
4. the power supply unit control method with output protection according to claim 3, its featureBe, in this first temperature anomaly discriminating program, load sent to a warning letter if temperature exceedes warning valueBreath, but do not stop power supply, and further judging whether temperature exceedes one and cross high temperature protection value, if do not exceedGet back to and obtain output current step, if exceeded high temperature protection value, started high temperature protection.
According to claim 1 to the power supply with output protection described in any one in claim 4Supply control method, is characterized in that, before judging whether output current is more than or equal to preposition protection value,First judge whether to be more than or equal to a protection threshold value, when output current is not more than or equal to protection threshold value, do not openMoving protection.
6. the power supply unit control method with output protection according to claim 5, its featureBe, if output current is more than or equal to protection threshold value, but while not being more than or equal to preposition protection value, enterOne second temperature anomaly discriminating program, this second temperature anomaly discriminating program comprises:
Judge whether temperature is more than or equal to a warning value, get back to and obtain output current step if do not exceed warning valueSuddenly; Load is sent to a warning message if exceed warning value, and further judge whether temperature is more than or equal toOne crosses high temperature protection value, gets back to and obtains output current step if be not more than or equal to, and protects if exceeded high temperatureThe value of protecting, started high temperature protection.
7. a power supply unit with output protection, is characterized in that, comprising:
One rectification circuit, has an ac power input end and a DC power output end;
One circuit of power factor correction, has an input and an output, its input and rectification circuitDC power output end connects;
One transformer, its primary side is connected with the output of circuit of power factor correction;
One output circuit, has an input and an output, and its input is connected with the secondary side of transformer;
One power switch, is connected with the primary side of transformer;
One PWM controller, has more than one back coupling input and PWM signal outputEnd, its PWM signal output part connects the also keying of power ratio control switch;
One microprocessor, has an output electric current measure end, a warning message output, a temperature signal defeatedEnter end, a lock bolt signal input part and an output; The activation forbidden energy of its output and PWM controllerEnd connects; This microprocessor a default overcurrent protection value;
One current detector, has an input and an output, the output of its input and output circuitConnect, the output of current detector is connected with the output electric current measure end of microprocessor;
One preposition testing circuit, has a current signal input and a lock bolt signal output part, its electric current letterNumber input is connected with the output of current detector, the lock bolt letter of its lock bolt signal output part and microprocessorNumber input connects; This preposition testing circuit provides one be less than but approach the preposition protection of overcurrent protection valueValue, and in the time that the output current of output circuit arrives this preposition protection value, send a police by preposition testing circuitAnnouncement information is to microprocessor;
One Temperature Detector, is located on the temperature signal input of microprocessor.
8. the power supply unit with output protection according to claim 7, is characterized in that, shouldPreposition testing circuit is mainly made up of a comparator and a lock bolt circuit, and it is defeated that comparator has a current signalEnter end and an output, its current signal input is connected with the output of current detector;
This lock bolt circuit has an input and a lock bolt signal output part, the output of its input and comparatorEnd connects, and its lock bolt signal output part is connected with the lock bolt signal input part of microprocessor.
9. according to the power supply unit with output protection described in claim 7 or 8, it is characterized in that,The lock bolt signal output part of this preposition testing circuit is connected with the warning message output of microprocessor.
10. the power supply unit with output protection according to claim 9, is characterized in that, shouldThe lock bolt signal output part of preposition testing circuit is by the warning message output of a phase inverter and microprocessorConnect.
CN201210425374.9A 2012-10-30 2012-10-30 There is power supply unit and the control method thereof of output protecting function CN103795277B (en)

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CN106160484B (en) * 2015-04-13 2018-07-27 康舒科技股份有限公司 Has the power supply circuit of low output voltage defencive function
CN108075445B (en) * 2016-11-14 2019-06-28 伟诠电子股份有限公司 The control gauge device and correlation technique of power supply unit

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