CN102074928A - Constant-voltage constant-current power supply and automatic calibration method for overvoltage and overcurrent protection thereof - Google Patents

Constant-voltage constant-current power supply and automatic calibration method for overvoltage and overcurrent protection thereof Download PDF

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Publication number
CN102074928A
CN102074928A CN2009102385188A CN200910238518A CN102074928A CN 102074928 A CN102074928 A CN 102074928A CN 2009102385188 A CN2009102385188 A CN 2009102385188A CN 200910238518 A CN200910238518 A CN 200910238518A CN 102074928 A CN102074928 A CN 102074928A
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protection
overvoltage
power
power supply
overcurrent protection
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CN2009102385188A
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CN102074928B (en
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王悦
王铁军
李维森
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Rigol Technologies Inc
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Rigol Technologies Inc
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Abstract

The invention provides a constant-voltage constant-current power supply and an automatic calibration method for overvoltage and overcurrent protection thereof. The automatic calibration method is to first indirectly measure an overvoltage protection actual threshold OVP<0> and an overcurrent protection actual threshold OCP<0> according to the circuit structure characteristics of an overvoltage protection (OVP) circuit and an overcurrent protection (OCP) circuit without reconstructing the conventional hardware structure of the constant-voltage constant-current power supply and then calibrate the overvoltage and overcurrent protection set values and actual thresholds of the power supply by using the overvoltage protection actual threshold OVP<0> and the overcurrent protection actual threshold OCP<0>.

Description

The method for self-calibrating of a kind of constant voltage constant current power and overvoltage thereof, overcurrent protection
Technical field
The method for self-calibrating of a kind of constant voltage constant current power of the present invention and overvoltage thereof, overcurrent protection relates to the DC power supply device technical field, particularly relates to the DC power supply technical field with constant pressure and flow function.
Background technology
No matter current society is that power-supply device is ubiquitous at scientific research institutions, laboratory, production line.And, because to improving constantly that production test efficient and output accuracy require, also more and more urgent to the demand of the programmability of power-supply device, the property monitored and fail safe.
Programmable power supply is exactly that self some function or parameter can be by the power supply of computer software programming control.Therefore, programmable power supply generally has been equipped with interfaces such as RS-232, USB, LAN, GPIB, can power supply be integrated in the automatization test system by these interfaces, so just can form the high professional test system of testing efficiency jointly with other programmable instruments.Programmable power supply has numerous species, can be divided into linear power supply, Switching Power Supply, DC power supply, AC power or the like.In the proframmable linear DC power supply, can be divided into constant pressure source, constant-current source and constant voltage constant current power again.
Wherein, described constant voltage constant current power overall structure block diagram can comprise as shown in Figure 1 usually:
Power output end, control unit CPU, keyboard, display, peripheral interface, D/A converter, A/D converter, simulated power output and measuring circuit.This CPU is the control centre of whole system, and the various piece of system and resource are all controlled, allocated and monitored by it.This keyboard is the most direct most common form of man-machine interaction, and the user can be by the output of Keyboard Control power supply and the setting of carrying out other function.It is the parameter and the state of monitoring power supply that this display mainly acts on, and comprises parameter, output parameter, output state or the like are set.This peripheral interface mainly comprises interface shapes such as RS232, GPIB, USB, LAN, connects host computer or network by these interfaces, thereby makes the user come Long-distance Control and monitoring power supply by mode such as say the word.After this D/A converter can be converted to analog signal with the digital signal of control unit CPU output, export simulated power output and measuring circuit to, at last, this analog signal outputs on user's the load RL via this simulated power output and measuring circuit, power output end.This A/D converter be generally used for the reading back output valve and the output state of simulated power output and measuring circuit, and simulated power can be exported and analog signal conversion that measuring circuit is exported to control unit CPU is a digital signal.
In described constant voltage constant current power, also further include in simulated power output and the measuring circuit: the constant voltage output loop CV and the constant current output loop CC that are connected to described power output end simultaneously.
Described constant voltage constant current power has following characteristic, that is, when connecting a last load for constant voltage constant current power, and to make the DA change-over circuit be voltage reference value Vs of constant voltage output loop CV output, in conjunction with reference to figure 1,3, during for current reference value Is of constant current output loop CC output.When Vs/Is>user load RL, described constant voltage constant current power will automatically operate under the constant current mode, promptly, at this moment, the corresponding described Is of output of described simulated power and measuring circuit exports constant electric current, and when Vs/Is<user load RL, described constant voltage constant current power will automatically operate under the constant voltage mode, that is, at this moment, the constant voltage of the corresponding described Vs output of described simulated power output and measuring circuit.
In the prior art, with reference to figure 1, described constant voltage constant current power is connected with overvoltage crowbar OVP and current foldback circuit OCP toward contact.Be mainly used in the setting to protection voltage or protective current,, prevent, or the reason of external equipment itself causes overvoltage or overcurrent damage to external equipment owing to the power failure reason for external equipment provides protection according to the user.
Its basic functional principle is that after the set point of user's input about overvoltage protection and overcurrent protection, the control unit CPU of power supply exports corresponding with it reference signal according to user's set point to overvoltage crowbar OVP and current foldback circuit OCP.When power work, overvoltage crowbar OVP and current foldback circuit OCP compare the output valve and the described reference signal of power supply automatically.When one of the voltage of the output of power supply or electric current surpass this reference signal; corresponding overvoltage crowbar OVP and current foldback circuit OCP can start immediately; the output of cutting off the electricity supply; and, be in the overload protection state in order to notice control unit cpu power simultaneously to control unit CPU output voltage overload protection signal Vs or overcurrent protection signal Is.
We make OVP with the set point note of the overvoltage protection of user's input I, overcurrent protection set point note make OCP IAnd the virtual voltage threshold value note during with overvoltage crowbar OVP and current foldback circuit OCP action is made OVP O, actual current threshold value note makes OCP OIn theory, above-mentioned OVP IShould with OVP OEquate OCP IShould with OCP OEquate.But in fact they are because middle each processing unit exists error often unequal; therefore we are necessary the set point OVP of overvoltage protection and the set point OCP of overcurrent protection are calibrated timely; with by changing the reference signal of CPU, make OVP to overvoltage crowbar OVP and current foldback circuit OCP output IWith OVP OEquate OCP IWith OCP OEquate.
But the set point OCP of the set point OVP of overvoltage protection and overcurrent protection of calibration carry out to(for) described constant voltage constant current power is very difficult thing, and reason is:
In the prior art; the A/D converter of described constant voltage constant current power can only be used for the output valve of read-back power output and measuring circuit; detect, calibrate the error between its output valve and the set point for the user only; and can't directly measure the actual door limit value (output valve of general OVP, OCP only on the circuit board of power supply inside, just can measure with manual method) of overvoltage crowbar OVP and current foldback circuit OCP.Therefore, have no idea overvoltage crowbar OVP and current foldback circuit OCP are calibrated automatically.So just might cause a kind of consequence; such as; after power supply arrives in user's hand; because components and parts reason; or because season; variations in temperature reason that environment causes or geographical position change the reasons such as atmospheric pressure variation that cause; make the set point OVP of overvoltage protection and the set point OCP of overcurrent protection produce skew; if can not calibrate overvoltage crowbar OVP and current foldback circuit OCP in time; the OVP that the user is imported; the threshold value of the power supply reality the when set point of OCP and overprotection produces bigger deviation; this situation is comparison danger sometimes, and the load RL to the user produces injury sometimes.
In view of existing problem in the above existing power supply, be necessary to provide a kind of need not that power supply is carried out hardware modification, can realize automatic Calibration Method is carried out in power supply overvoltage, overcurrent protection.
Summary of the invention
Main purpose of the present invention is to solve problems of the prior art, and the method for self-calibrating of a kind of constant voltage constant current power overvoltage, overcurrent protection is provided.
Another object of the present invention is to solve problems of the prior art, a kind of constant voltage constant current power is provided.
The objective of the invention is to be achieved by following technical proposals:
The method for self-calibrating of a kind of power supply overvoltage, overcurrent protection, realize based on constant voltage constant current power, described constant voltage constant current power has a power output end, a power supply output block, power protection parts, a control assembly that connects described power supply output block, guard block, described power supply output block comprises that a constant voltage loop that is connected to power output end, constant current loop, a described guard block comprise an overvoltage crowbar and current foldback circuit that is connected to power output end; The overvoltage of this power supply, the method for self-calibrating of overcurrent protection comprise following concrete steps:
(1) voltage and current of power calibration, and preserve its calibration factor;
(2) select to carry out overvoltage protection calibration or overcurrent protection calibration; If selecting overvoltage protection calibrates then execution in step (A); If selecting overcurrent protection calibrates then execution in step (B);
(A) power supply overvoltage protection circuit is carried out the overvoltage protection calibration, specifically comprise the steps:
(A1) sampled data quantity is set;
(A2) set a brand-new overvoltage protection set point OVP I
(A3) set supply voltage set point V I, this voltage setting value V ILess than the overvoltage protection set point OVP that sets in the step (A2) I
(A4) check whether power supply overvoltage protection takes place; If overvoltage protection does not take place, execution in step (A5) then; If generation overvoltage protection, then execution in step (A6);
(A5) stepping improves voltage setting value V I, and return step (A4);
(A6) with voltage setting value V at this moment IAs overvoltage protection actual door limit value OVP O, write down this group overvoltage protection set point OVP IAnd overvoltage protection actual door limit value OVP OSampled data;
(A7) check the sampled data that whether has obtained to set in the step (A1) quantity; If, execution in step (A8) then; If not, execution in step (A2) then;
(A8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OVP I* K V+ A V=OVP OCalculate calibration parameter K V, A V
(A9) preserve calibration parameter K V, A V, and finish the overvoltage protection calibration process;
(B) the power supply current foldback circuit is carried out the overcurrent protection calibration, specifically comprise the steps:
(B1) sampled data quantity is set;
(B2) set a brand-new overcurrent protection set point OCP I
(B3) set source current set point I I, this current setting value I ILess than the overcurrent protection set point OCP that sets in the step (B2) I
(B4) check whether power supply overcurrent protection takes place; If overcurrent protection does not take place, execution in step (B5) then; If generation overcurrent protection, then execution in step (B6);
(B5) stepping improves current setting value I I, and return step (B4);
(B6) with current setting value I at this moment IAs overcurrent protection actual door limit value OCP O, write down this group overcurrent protection set point OCP IAnd overcurrent protection actual door limit value OCP OSampled data;
(B7) check the sampled data that whether has obtained to set in the step (B1) quantity; If, execution in step (B8) then; If not, execution in step (B2) then;
(B8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OCP I* K C+ A C=OCP OCalculate calibration parameter K C, A C
(B9) preserve calibration parameter K C, A C, and finish the overcurrent protection calibration process.
A kind of constant voltage constant current power, have a power output end, a power supply output block, power protection parts, an input block, a control assembly that connects described input block, power supply output block, guard block, described power supply output block comprises that a constant voltage loop that is connected to power output end, constant current loop, a described guard block comprise an overvoltage crowbar and a current foldback circuit; Described a kind of constant voltage constant current power comprises the automatic calibration steps of following overvoltage, overcurrent protection:
(1) sets a power protection set point;
(2) set a power supply output set point less than described power protection set point;
(3) judge whether to take place overload protection, if described overload protection does not take place, execution in step (4) then; If described overload protection takes place, execution in step (5) then;
(4) stepping improves described power supply output set point, returns execution in step (3);
(5) current power supply output set point is used to calibrate described power protection set point.
Constant voltage constant current power of the present invention can further include the automatic calibration steps of following overvoltage, overcurrent protection:
(11) set a current protection set point;
(22) set an electric current output set point less than described current protection set point;
(33) judge whether to take place overcurrent protection, if described overcurrent protection does not take place, execution in step (44) then; If described overcurrent protection takes place, execution in step (55) then;
(44) stepping improves described electric current output set point, returns execution in step (33);
(55) current electric current output set point is used to calibrate described current protection set point.
The invention has the beneficial effects as follows: the method for self-calibrating of a kind of constant voltage constant current power of the present invention and overvoltage thereof, overcurrent protection is by means of constant voltage constant current power overvoltage crowbar OVP and the circuit structure characteristics of current foldback circuit OCP own; under the prerequisite of not transforming constant voltage constant current power existing hardware structure, to the actual door limit value OVP of its overvoltage, overcurrent protection O, OCP OCarry out indirect measurement, thereby finish the calibration process of overvoltage, overcurrent protection, have simple to operately, cost is low, the calibration characteristic of accurate.
Description of drawings
Fig. 1 is the constant voltage constant current power circuit structure diagram;
Fig. 2 is power supply overvoltage, overcurrent protection method for self-calibrating flow chart;
Fig. 3 is the simulated power output of constant voltage constant current power and the performance specification figure of measuring circuit.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
The method for self-calibrating of the designed power supply overvoltage of the present invention, overcurrent protection is based on that constant voltage constant current power realizes.This constant voltage constant current power structure can comprise as shown in Figure 1 usually:
Power output end, control unit CPU, keyboard, display, peripheral interface, D/A converter, A/D converter, simulated power output and measuring circuit.This CPU is the control assembly of power supply, is the control centre of whole power-supply system, and the various piece of power-supply system and resource are all controlled, allocated and monitored by it.This keyboard is the most direct most common form of man-machine interaction, and the user can be by the output of Keyboard Control power supply and the setting of carrying out other function.It is the parameter and the state of monitoring power supply that this display mainly acts on, and comprises parameter, output parameter, output state or the like are set.This peripheral interface mainly comprises interface shapes such as RS232, GPIB, USB, LAN, connects host computer or network by these interfaces, makes the user come Long-distance Control and monitoring power supply by mode such as say the word.This D/A converter is used for the digital signal of control unit CPU output is converted to analog signal, and last, the analog signal of D/A converter output outputs on user's the load RL via described simulated power output and measuring circuit, power output end.This A/D converter is mainly used in the output valve of read back simulated power output and measuring circuit.
In the described constant voltage constant current power of present embodiment, also further include in simulated power output and the measuring circuit: the constant voltage output loop CV and the constant current output loop CC that are connected to power output end simultaneously.
Described constant voltage constant current power has following characteristic, that is, when connecting a last load RL for constant voltage constant current power, and to make the DA change-over circuit be voltage reference value Vs of constant voltage output loop CV output, in conjunction with reference to figure 1,3, during for current reference value Is of constant current output loop CC output.When Vs/Is>RL, described constant voltage constant current power will automatically operate under the constant current mode, promptly, at this moment, the corresponding described Is of output of described simulated power and measuring circuit exports constant electric current, and when Vs/Is<RL, described constant voltage constant current power will automatically operate under the constant voltage mode, that is, at this moment, the constant voltage of the corresponding described Vs output of described simulated power output and measuring circuit.
In addition, in the simulated power output and measuring circuit of described constant voltage constant current power, also be provided with overvoltage crowbar OVP and current foldback circuit OCP.Be mainly used in the setting to protection voltage or protective current,, prevent, or the reason of external equipment itself causes overvoltage or overcurrent damage to external equipment owing to the power failure reason for external equipment provides protection according to the user.This overvoltage crowbar OVP links to each other with power output end with the power protection parts that current foldback circuit OCP constitutes power supply.
After the set point of user's input about overvoltage protection and overcurrent protection, the control unit CPU of power supply exports corresponding with it reference signal according to user's set point to overvoltage crowbar OVP and current foldback circuit OCP.When power work, overvoltage crowbar OVP and current foldback circuit OCP compare the output valve and the described reference signal of power supply automatically.When one of the voltage of the output of power supply or electric current surpass this reference signal; corresponding overvoltage crowbar OVP and current foldback circuit OCP can start immediately; the output of cutting off the electricity supply; and simultaneously to control unit CPU output voltage overload protection signal Vs or overcurrent protection signal Is;, be in the overload protection state in order to the prompting power supply.
For above-mentioned this constant voltage constant current power, the method for self-calibrating of the designed power supply overvoltage of the present invention, overcurrent protection is based on to be realized after the output set point of finishing power supply and the calibration between the real output value.
Here, be example with the set point and the calibration steps between the output valve of supply voltage, introduce the calibration steps of electric power output voltage down.We make V with the magnitude of voltage note that the user sets I, the voltage output value note of power supply reality is made V OBy the actual measurement experience, we know voltage setting value V I, voltage output value V OBetween be linear relationship, i.e. V I* K+A=V OWe do the calibration between voltage setting value and the output valve, will obtain K and A value in the above-mentioned expression formula in fact exactly, and it is preserved, in order to the voltage setting value and the output valve of follow-up use are calibrated.
As an illustration, in actual applications,, also can adopt quadratic fit relational expression or other match relational expressions that electric power output voltage is calibrated according to accuracy demand or other demand reasons.
And the set point and the calibration relation between the output valve of power source voltage, electric current are similar, the setting protection value OVP of power supply overvoltage, overcurrent protection I, OCP IActual door limit value OVP with overvoltage, overcurrent protection O, OCP OBetween also selected linear fit relation, the i.e. OVP of adopting I* K V+ A V=OVP O, OCP I* K C+ A C=OCP OWe also only need obtain the K in the above-mentioned expression formula VAnd A VValue, K CAnd A CBe worth, and it is preserved, can realize the calibration of power supply overvoltage, overcurrent protection.
The direct measurement interface of overvoltage crowbar OVP and current foldback circuit OCP actual door limit value is provided based on the unpromising user of structure of described constant pressure and flow electricity power supply as previously mentioned.Therefore, described constant voltage constant current power can't independently be finished the actual door limit value OVP to overvoltage, overcurrent protection O, OCP OMeasurement, and then realize calibration parameter K VAnd A VValue, K CAnd A CValue is calculated.
The designed power supply overvoltage of the present invention, the method for self-calibrating of overcurrent protection; main design philosophy is to depend on overvoltage crowbar OVP and the circuit structure characteristics of current foldback circuit OCP own; under the prerequisite of not transforming constant voltage constant current power existing hardware structure, to the actual door limit value OVP of its overvoltage, overcurrent protection O, OCP OCarry out indirect measurement.So-called overvoltage crowbar OVP and the circuit structure characteristics of current foldback circuit OCP own are meant that overvoltage crowbar OVP and current foldback circuit OCP itself are actually a comparison circuit, and it passes through voltage output value V OWith overvoltage protection actual door limit value OVP OCompare, and with current output value I OWith overvoltage protection actual door limit value OCP OCompare and judge its size, and then make the protection action.As long as we calibrate voltage output value Vo and current output value Io in advance, then, just can be by progressive raising voltage output value V OWith current output value I O, until it overvoltage crowbar OVP and current foldback circuit OCP are made and cut off action, then can be with the voltage output value V of this moment OWith current output value I OBe considered as the actual door limit value OVP of overvoltage, overcurrent protection O, OCP OThe present invention promptly is based on the method for self-calibrating that this design philosophy designs this power supply overvoltage, overcurrent protection.
The idiographic flow step of the method for self-calibrating of described power supply overvoltage, overcurrent protection as shown in Figure 2, comprises following concrete steps:
(1) voltage and current of power calibration, and preserve its calibration factor;
Here, at first be to calibrate power source voltage, electric current outlet line, with the basis of power supply overvoltage, overcurrent protection being calibrated as the back.Wherein, power source voltage, correcting current method have been prior art, just no longer describe in detail at this.
(2) select to carry out overvoltage protection calibration or overcurrent protection calibration; If the user selects overvoltage protection to calibrate then execution in step (A); If the user selects overcurrent protection to calibrate then execution in step (B);
(A) power supply overvoltage protection circuit is carried out the overvoltage protection calibration, specifically comprise the steps:
(A1) sampled data quantity is set;
As previously mentioned; the principle of the calibrating principle that method for self-calibrating adopted of the designed overvoltage of the present invention, overcurrent protection and voltage, correcting current method is similar; all be that set point and output valve by sample some groups of voltages, electric current carries out curve fitting, thereby obtain crucial calibration parameter K and A.As seen, calibrate by this principle, the calibration parameter K and the A that obtain of many its matched curves is accurate more more for the data set of sampling, but the time of opposite calibration is also just long more.Therefore, provide the user setting here, according to self the requirement of calibration accuracy and calibration efficiency is set to make things convenient for the user to sampled data quantity.
(A2) set a brand-new overvoltage protection set point OVP I
(A3) set supply voltage set point V I, this voltage setting value V ILess than the overvoltage protection set point OVP that sets in the step (A2) I
Here, owing in step (1) before, finished calibration to supply voltage and electric current, so this voltage setting value V IWith voltage output value V OEquate.
(A4) check whether power supply overvoltage protection takes place; If overvoltage protection does not take place, execution in step (A5) then; If generation overvoltage protection, then execution in step (A6);
(A5) stepping improves voltage setting value V I, and return step (A4);
Here, voltage setting value V IThe stepping amplitude can be by the user according to the calibration accuracy needs from main regulation;
(A6) with voltage setting value V at this moment IAs overvoltage protection actual door limit value OVP O, write down this group overvoltage protection set point OVP IAnd overvoltage protection actual door limit value OVP OSampled data is with this overvoltage protection set point OVP IAnd overvoltage protection actual door limit value OVP OBe used for the calibration of overvoltage protection set point;
(A7) check the sampled data that whether has obtained to set in the step (A1) quantity; If, execution in step (A8) then; If not, execution in step (A2) then;
(A8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OVP I* K V+ A V=OVP OCalculate calibration parameter K V, A V
(A9) preserve calibration parameter K V, A V, and finish the overvoltage protection calibration process;
(B) the power supply current foldback circuit is carried out the overcurrent protection calibration, specifically comprise the steps:
(B1) sampled data quantity is set;
(B2) set a brand-new overcurrent protection set point OCP I
(B3) set source current set point I I, this current setting value I ILess than the overcurrent protection set point OCP that sets in the step (B2) I
(B4) check whether power supply overcurrent protection takes place; If overcurrent protection does not take place, execution in step (B5) then; If generation overcurrent protection, then execution in step (B6);
(B5) stepping improves current setting value I I, and return step (B4);
(B6) with current setting value I at this moment IAs overcurrent protection actual door limit value OCP O, write down this group overcurrent protection set point OCP IAnd overcurrent protection actual door limit value OCP OSampled data is with this overcurrent protection set point OCP IAnd overcurrent protection actual door limit value OCP OBe used for the calibration of overcurrent protection set point;
(B7) check the sampled data that whether has obtained to set in the step (B1) quantity; If, execution in step (B8) then; If not, execution in step (B2) then;
(B8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OCP I* K C+ A C=OCP OCalculate calibration parameter K C, A C
(B9) preserve calibration parameter K C, A C, and finish the overcurrent protection calibration process.
As an illustration, when the user selects to carry out overvoltage protection calibration or overcurrent protection calibration; If select the overvoltage protection calibration; the user need confirm that the output of power supply is an open-circuit condition; to guarantee when carrying out the overvoltage protection calibration; power work is under constant voltage mode; equally when selecting the overcurrent protection calibration; the user need utilize the output head grounding of short-circuit block with power supply, makes its short circuit, to guarantee that power work is under constant current mode.
By above-mentioned overvoltage, overcurrent protection self-calibration process; the user can be under the condition of not transforming the power supply hardware configuration; thereby, finally reach the purpose that power supply overvoltage, overcurrent protection are calibrated by the indirect measurement overvoltage of the output valve of stepping raising voltage, electric current, the actual door limit value of overcurrent protection.
Should be pointed out that all may there be certain error in any calibration data in measuring.And these errors directly influence final calibration result probably.The front was mentioned, the setting protection value OVP of power supply overvoltage, overcurrent protection I, OCP IActual door limit value OVP with overvoltage, overcurrent protection O, OCP OBetween be linear, i.e. OVP I* K V+ A V=OVP O, OCP I* K C+ A C=OCP OTherefore, the present invention has added the error checking program also according to these characteristics in the calibration process of overvoltage, overcurrent protection, specific as follows:
Between described step (A8), (A9), also comprise the steps:
(A8i), and judge that this curve fit degree is whether within the certain limit value according to the sampled data calculated curve degree of fitting that is obtained; If execution in step (A9), if not execution in step (A8ii);
The method of sampled data calculated curve degree of fitting is thought prior art well-known to those skilled in the art herein, just no longer describe in detail at this.
(A8ii) feedback overvoltage protection calibration failure information finishes the overvoltage protection calibration process.
Between described step (B8), (B9), also comprise the steps:
(B8i), and judge that this curve fit degree is whether within the certain limit value according to the sampled data calculated curve degree of fitting that is obtained; If execution in step (B9), if not execution in step (B8ii);
(B8ii) feedback overcurrent protection calibration failure information finishes the overcurrent protection calibration process.
In sum; the designed power supply overvoltage of the present invention, the method for self-calibrating of overcurrent protection are to depend on overvoltage crowbar OVP and the circuit structure characteristics of current foldback circuit OCP own; under the prerequisite of not transforming constant voltage constant current power existing hardware structure, to the actual door limit value OVP of its overvoltage, overcurrent protection O, OCP OCarry out indirect measurement, thereby finish the calibration process of overvoltage, overcurrent protection.Persons skilled in the art are under this design philosophy, and any not creative transformation of being done all should be considered as within protection scope of the present invention.

Claims (6)

1. constant voltage constant current power overvoltage; the method for self-calibrating of overcurrent protection; realize based on constant voltage constant current power; described constant voltage constant current power has a power output end; a power supply output block; power protection parts; one connects described power supply output block; the control assembly of guard block; described power supply output block comprises a constant voltage loop that is connected to power output end; a constant current loop; described guard block comprises an overvoltage crowbar and current foldback circuit that is connected to power output end, it is characterized in that: the overvoltage of this power supply; the method for self-calibrating of overcurrent protection comprises following concrete steps:
(1) voltage and current of power calibration, and preserve its calibration factor;
(2) select to carry out overvoltage protection calibration or overcurrent protection calibration; If selecting overvoltage protection calibrates then execution in step (A); If selecting overcurrent protection calibrates then execution in step (B);
(A) power supply overvoltage protection circuit is carried out the overvoltage protection calibration, specifically comprise the steps:
(A1) sampled data quantity is set;
(A2) set a brand-new overvoltage protection set point OVP I
(A3) set supply voltage set point V I, this voltage setting value V ILess than the overvoltage protection set point OVP that sets in the step (A2) I
(A4) check whether power supply overvoltage protection takes place; If overvoltage protection does not take place, execution in step (A5) then; If generation overvoltage protection, then execution in step (A6);
(A5) stepping improves voltage setting value V I, and return step (A4);
(A6) with voltage setting value V at this moment IAs overvoltage protection actual door limit value OVP O, write down this group overvoltage protection set point OVP IAnd overvoltage protection actual door limit value OVP OSampled data;
(A7) check the sampled data that whether has obtained to set in the step (A1) quantity; If, execution in step (A8) then; If not, execution in step (A2) then;
(A8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OVP I* K V+ A V=OVP OCalculate calibration parameter K V, A V
(A9) preserve calibration parameter K V, A V, and finish the overvoltage protection calibration process;
(B) the power supply current foldback circuit is carried out the overcurrent protection calibration, specifically comprise the steps:
(B1) sampled data quantity is set;
(B2) set a brand-new overcurrent protection set point OCP I
(B3) set source current set point I I, this current setting value I ILess than the overcurrent protection set point OCP that sets in the step (B2) I
(B4) check whether power supply overcurrent protection takes place; If overcurrent protection does not take place, execution in step (B5) then; If generation overcurrent protection, then execution in step (B6);
(B5) stepping improves current setting value I I, and return step (B4);
(B6) with this moment current setting value II as overcurrent protection actual door limit value OCP O, write down this group overcurrent protection set point OCP IAnd overcurrent protection actual door limit value OCP OSampled data;
(B7) check the sampled data that whether has obtained to set in the step (B1) quantity; If, execution in step (B8) then; If not, execution in step (B2) then;
(B8) according to the sampled data matched curve that is obtained, and according to calibration expression formula OCP I* K C+ A C=OCP OCalculate calibration parameter K C, A C
(B9) preserve calibration parameter K C, A C, and finish the overcurrent protection calibration process.
2. the method for self-calibrating of power supply overvoltage as claimed in claim 1, overcurrent protection is characterized in that: also comprise the steps: between described step (A8), (A9)
(A8i), and judge that this curve fit degree is whether within the certain limit value according to the sampled data calculated curve degree of fitting that is obtained; If execution in step (A9), if not execution in step (A8ii);
(A8ii) feedback overvoltage protection calibration failure information finishes the overvoltage protection calibration process.
3. the method for self-calibrating of power supply overvoltage as claimed in claim 1, overcurrent protection is characterized in that: also comprise the steps: between described step (B8), (B9)
(B8i), and judge that this curve fit degree is whether within the certain limit value according to the sampled data calculated curve degree of fitting that is obtained; If execution in step (B9), if not execution in step (B8ii);
(B8ii) feedback overcurrent protection calibration failure information finishes the overcurrent protection calibration process.
4. constant voltage constant current power; have a power output end, a power supply output block; power protection parts; an input block, a control assembly that connects described input block, power supply output block, guard block; described power supply output block comprises that a constant voltage loop that is connected to power output end, constant current loop, a described guard block comprise an overvoltage crowbar and a current foldback circuit, is characterized in that: the automatic calibration steps that comprises following overvoltage, overcurrent protection:
(1) sets a power protection set point;
(2) set a power supply output set point less than described power protection set point;
(3) judge whether to take place overload protection, if described overload protection does not take place, execution in step (4) then; If described overload protection takes place, execution in step (5) then;
(4) stepping improves described power supply output set point, returns execution in step (3);
(5) current power supply output set point is used to calibrate described power protection set point.
5. constant voltage constant current power as claimed in claim 4 is characterized in that: the automatic calibration steps that comprises following overvoltage, overcurrent protection:
(11) set a current protection set point;
(22) set an electric current output set point less than described current protection set point;
(33) judge whether to take place overcurrent protection, if described overcurrent protection does not take place, execution in step (44) then; If described overcurrent protection takes place, execution in step (55) then;
(44) stepping improves described electric current output set point, returns execution in step (33);
(55) current electric current output set point is used to calibrate described current protection set point.
6. constant voltage constant current power as claimed in claim 4 is characterized in that: step (5) comprises described current power supply output set point of record and described power protection set point.
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CN102739212B (en) * 2012-06-29 2014-12-10 台达电子企业管理(上海)有限公司 Over-current protection point setting method, system and control device for electronic equipment
CN102739212A (en) * 2012-06-29 2012-10-17 台达电子企业管理(上海)有限公司 Over-current protection point setting method, system and control device for electronic equipment
CN104122917A (en) * 2013-04-24 2014-10-29 立锜科技股份有限公司 Protection device and correcting method thereof
CN104122917B (en) * 2013-04-24 2016-06-08 立锜科技股份有限公司 Protector and correction method thereof
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CN104698361A (en) * 2013-12-05 2015-06-10 珠海格力电器股份有限公司 Testing device of intelligent power module
CN104503440B (en) * 2014-12-18 2017-02-01 中科恒源科技股份有限公司 Photovoltaic controller calibration method and system
CN104503440A (en) * 2014-12-18 2015-04-08 中科恒源科技股份有限公司 Photovoltaic controller calibration method and system
CN106291398B (en) * 2016-08-31 2018-08-31 北京航天科颐技术有限公司 A kind of ageing rack for providing Heng Yuan for secondary power supply aging test
CN106291398A (en) * 2016-08-31 2017-01-04 北京航天科颐技术有限公司 A kind of for providing the ageing rack of Heng Yuan for secondary power supply aging test
CN107645188A (en) * 2017-09-26 2018-01-30 郑州云海信息技术有限公司 A kind of method and system of balance PSU and BBU charging overcurrent protections
CN107645188B (en) * 2017-09-26 2022-02-18 郑州云海信息技术有限公司 Method and system for balancing PSU and BBU charging overcurrent protection
CN108802654A (en) * 2018-07-06 2018-11-13 山东大学 A kind of the automatic Calibration acquisition system and method for forming and capacity dividing test power supply
WO2020042341A1 (en) * 2018-08-31 2020-03-05 重庆惠科金渝光电科技有限公司 Correction method, correction apparatus and display apparatus
US10837988B2 (en) 2018-08-31 2020-11-17 Chongqing Hkc Optoelectronics Technology Co., Ltd. Correction method, correction device, and display device
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