CN111030225A - Bidirectional power supply device and control method thereof - Google Patents

Bidirectional power supply device and control method thereof Download PDF

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Publication number
CN111030225A
CN111030225A CN201911327791.8A CN201911327791A CN111030225A CN 111030225 A CN111030225 A CN 111030225A CN 201911327791 A CN201911327791 A CN 201911327791A CN 111030225 A CN111030225 A CN 111030225A
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China
Prior art keywords
voltage
current
detected
value
loop
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窦友婷
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Doctor De Science And Technology (jiangsu) Co Ltd
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Doctor De Science And Technology (jiangsu) Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a bidirectional power supply device and a control method thereof, wherein the device comprises a detection unit, a power unit and a digital signal processing unit, wherein the digital signal processing unit charges and discharges an object to be detected according to a stored current value and a stored upper and lower voltage limit value; when the stored current value Iset is a positive value, charging the object to be detected by Iset if the detected voltage is lower than the upper voltage limit value, and discharging the object to be detected by a small current value Izero-in the DSP if the detected voltage is higher than the upper voltage limit value; when the stored current value Iset is a negative value, if the detected voltage is higher than the lower voltage limit value, Iset is used for discharging the object to be detected, and if the detected voltage is lower than the lower voltage limit value, a small current value Izero + in the DSP is used for charging the object to be detected. The protection effect on the object to be measured in the charging and discharging process is ensured by setting the upper and lower voltage limit values and the value of the built-in small-current Izero loop.

Description

Bidirectional power supply device and control method thereof
Technical Field
The invention relates to the technical field of direct-current power supplies, in particular to a bidirectional power supply device and a control method thereof.
Background
The core circuit of the bidirectional DC power supply device is composed of bidirectional DC-DC, and the bidirectional DC power supply device has wide application field, can realize the charge and discharge performance test of the battery, can also provide stable and adjustable direct current power supply power electricity for the motor, the controller, automobile electronics and the like in the form, performance, durability and other tests, and can also feed back the counter electromotive potential energy in the test.
If the battery test is received, whether the object battery is charged or discharged at present is judged by setting the voltage Vset, and the charging and discharging are respectively carried out according to the set positive and negative current values, so that the voltage Vset intervenes between the charging and the discharging, if the charging is switched to the discharging, the setting of the Vset needs to be changed, and the current is discontinuous, and the CC priority mode is adopted for the bidirectional power supply: referring to an Agilent N7900 bidirectional direct-current power supply, in a current priority mode, the battery can be charged and discharged by setting the positive and negative of current, but no VH and VL upper and lower voltage thresholds and zero current loops exist, the battery protection level is low, and the loop output state is not initialized in the overshoot of current switching, so that the overshoot exists in the current zero-crossing switching.
In summary, both of the above two common DC sources for testing charging and discharging of the battery have problems of overshoot of current positive and negative switching and incomplete protection.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a bidirectional power supply device and a control method thereof.
The invention is realized by the following steps:
the power conversion unit is connected with an object to be detected, and the current flows in a bidirectional mode to charge and discharge the object to be detected;
the detection unit is coupled between the power conversion unit and the object to be detected and is used for detecting the voltage corresponding to the object to be detected;
the digital signal processing unit controls the power conversion unit to charge the object to be tested according to the stored positive current value of the current Iset until the voltage of the object to be tested reaches the stored upper voltage limit value VH; or controlling the power conversion unit to discharge the object to be tested according to the stored negative current value of the current Iset until the voltage of the object to be tested reaches the stored lower voltage limit value VL.
Further, can prevent that user's parameter from setting up the mistake, reinforcing protect function, built-in zero current ring IZero, promptly:
when the stored current Iset is a positive value and the voltage of the object to be detected is higher than the stored voltage upper limit value VH, discharging the object to be detected to the voltage upper limit value VH according to a current Izero-; when the stored current Iset is a negative value and the voltage of the object to be tested is lower than the stored lower voltage limit VL, the object to be tested is charged to the lower voltage limit VL according to a current Izero +.
Further, the current values Izero-, Izero + are one small current value inside the digital signal processing unit, and-Imax < Izero- <0, 0< Izero + < Imax +, where Imax is the rated current of the power supply device.
And further, the current is switched between positive and negative seamlessly, the performance of the object to be tested is tested really, and when the digital signal processing unit detects the sign change of the stored current Iset, the last output state value of the loop is assigned to the next output state value.
The power unit comprises an AC-DC module and a DC-DC module, wherein the AC-DC module is used for converting alternating current voltage into direct current voltage; the DC-DC module is used for converting the direct-current voltage into required direct-current voltage; the DC-DC module is connected with an object to be tested.
The digital signal processing unit is a DSP, PWM control is carried out on the DC-DC module, the DSP sends the judgment result to the CPU, the CPU receives the storage of the upper voltage limit value, the lower voltage limit value and the current value Iset of a user, and the current voltage and the current of charging and discharging of the battery are displayed on an interface.
The invention also provides a control method of the bidirectional power supply device, which comprises the following steps:
storing the current Iset, the upper voltage limit value VH and the lower voltage limit value VL;
when the stored current Iset > =0, judging that the detected voltage Vb of the object to be detected is smaller than the voltage upper limit value VH, and carrying out constant current charging on the object to be detected by using the stored current Iset until the charging voltage of the object to be detected reaches the voltage upper limit value;
and when the stored current Iset is less than 0, judging that the detected voltage Vb of the object to be detected is greater than the voltage lower limit value VL, and carrying out constant-current discharge on the object to be detected by using the stored current Iset until the discharge voltage of the object to be detected reaches the voltage lower limit value VL.
Further, when the stored current Iset > =0 and the detected voltage Vb of the object to be detected is judged to be larger than the voltage upper limit value VH, constant current discharging is carried out on the object to be detected by using the Izero-current value in the DSP until the discharging voltage of the object to be detected reaches the voltage upper limit value;
and when the stored current Iset is less than 0, judging that the voltage Vb of the detected object to be detected is less than the voltage lower limit value VL, carrying out constant current charging on the object to be detected by using the Izero + current value in the DSP until the charging voltage of the object to be detected reaches the voltage lower limit value.
If Iset changes from positive to negative, the step is executed: assigning the output value of the positive current loop to the negative current loop; the voltage loop is changed from positive saturation to negative saturation; the output value of the positive power loop is assigned to the negative power loop.
If Iset changes from positive value to negative value, executing the following steps: assigning the output value of the negative current loop to the positive current loop; the voltage loop is changed from negative saturation to positive saturation; the output value of the negative power loop is assigned to the positive power loop.
And under the condition that the positive and negative values of the stored current Iset do not jump, continuously executing the calculation of the original loop, wherein the original loop can be a voltage loop, a positive current loop, a negative current loop, a positive power loop and a negative power loop.
The bidirectional power supply device and the control method thereof have the following beneficial effects:
1. the upper limit value and the lower limit value of the voltage are set, so that the upper threshold value and the lower threshold value of the battery in the charging and discharging process are ensured, and a certain protection effect is achieved.
2. And zero current loop Izero control is added in the CC priority mode, so that the protection effect is effectively enhanced, and the phenomenon that the charging and discharging of the object to be detected are abnormal due to wrong setting of a user is prevented.
3. And assigning and calculating loops by detecting the change of the signs of the current Iset, if the signs of the current Iset are not changed, normally operating all loop calculations, assigning the loop outputs acted after comparison to a DSP so as to output corresponding PWM, and finally recycling the PWM to a main loop.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a control method of a bidirectional power supply according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a bidirectional power supply according to an embodiment of the present invention for implementing seamless switching between positive and negative currents.
Fig. 3 is a schematic diagram of loop control in the bidirectional power control method according to the embodiment of the present invention.
Fig. 4 is a schematic diagram of a bidirectional power supply apparatus according to an embodiment of the invention.
Fig. 5 is a comparison graph of the working regions of fig. 5b of the prior art fig. 5a and the fig. 5 of the present invention when the stored current Iset > =0, which is provided by the embodiment of the present invention.
Fig. 6 is a graph comparing the working regions of fig. 6a of the prior art to fig. 6b of the present invention when the stored current Iset <0, as provided by an embodiment of the present invention.
Fig. 7 is a schematic diagram of a bidirectional power supply device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present embodiment, the analyte is described as a battery to be detected, and those skilled in the art can understand that the analyte is not limited to the battery to be detected.
Referring to fig. 1, an embodiment of the present invention provides a bidirectional DC power control method, including the following steps:
and S101, acquiring the voltage corresponding to the battery to be detected.
It should be noted that the DSP can detect the voltage of the battery to be detected, specifically, the voltage of the battery is obtained through the a/D converter, for example, the obtained voltage is Vb.
And S102, comparing the acquired voltage with a preset voltage upper limit value and a preset voltage lower limit value.
It is understood that the voltage upper limit value VH and the voltage lower limit value VL are set in advance, and then the obtained voltage Vb is compared with the voltage upper limit value VH and the voltage lower limit value VL, respectively.
It is understood that Iset is preset on the UI, and is greater than 0 and less than 0, alternatively, if LIST is used, it can be compiled to be greater than 0, and the charge and discharge time can be directly set by the UI, the first 1 second is greater than 0, and then Iset is directly set to be less than 0, or it can be implemented by editing LIST.
S103, when the preset current value Iset is not less than zero, the charging or discharging of the detection battery is adjusted to enable the charging voltage or the discharging voltage to reach the voltage upper limit value; or when the preset current value Iset is less than zero, the charging or discharging of the detection battery is adjusted so that the charging voltage or the discharging voltage reaches the voltage lower limit value.
It should be noted that in the embodiment of the present invention, Iset is not less than zero, and whether a charging or discharging manner is adopted, the purpose is to achieve that the charging voltage or the discharging voltage reaches the voltage upper limit value.
In one specific implementation manner of the present invention, the step of adjusting the charging or discharging of the detection battery so that the charging voltage or the discharging voltage reaches the voltage upper limit includes:
judging whether the upper voltage limit value is not less than the acquired voltage, and Iset is not less than 0;
if yes, constant current charging is carried out on the detection battery by the set charging current until the charging voltage reaches the upper limit value of the voltage;
if not, performing constant current discharge on the battery to be detected by using the minimum current value in the DSP until the discharge voltage reaches the voltage upper limit value.
And the DSP judges:
if Iset > =0, and VH > = Vb, the battery is subjected to constant current charging with the set I + until the charging voltage reaches VH;
if Iset > =0, and VH < Vb, the battery is discharged with constant current with Izero- (very small value) inside DSP until the discharge voltage reaches VH.
It should be noted that, in the embodiment of the present invention, when Iset is less than zero, whether a charging or discharging manner is adopted, the purpose is to achieve that the charging voltage or the discharging voltage reaches the voltage lower limit value.
In one implementation, the step of adjusting the charging or discharging of the detection battery so that the charging voltage or the discharging voltage reaches the voltage lower limit value includes:
judging whether the lower limit value of the voltage is not less than the acquired voltage, and Iset is less than 0;
if so, performing constant current charging on the battery to be detected by using the minimum current value in the DSP until the charging voltage reaches the lower limit value of the voltage;
and if not, performing constant-current discharge on the battery to be detected by the set discharge current until the discharge voltage reaches the voltage lower limit value.
And the DSP judges:
if Iset <0, and VL < Vb, discharging the battery at a constant current with I-set until the discharge voltage reaches VL;
if Iset <0, and VL > = Vb, the battery is constant current charged with Izero + (a very small value) inside the DSP until the charge voltage reaches VL.
And S104, if Iset is changed, assigning the last output state of the loop to the next output state so as to enable the loop output to be connected during charging and discharging.
Through steps S101 to S103, after the voltage upper limit VH and the voltage lower limit VL and the current value Iset are set, the current waveform for charging and discharging the battery is given, and the zero-crossing point is changed without punching, as shown in the current charging and discharging curve shown in fig. 2.
As shown in fig. 3, in one implementation, the method further includes:
under the condition that the current of the battery to be detected jumps in positive and negative values, if Iset changes from a positive value to a negative value, executing the following steps: assigning the state of the positive current loop to a negative current; the voltage loop is changed from positive saturation to negative saturation; the state of the positive power loop is assigned to the negative power loop.
Under the condition that the current of the battery to be detected jumps in positive and negative values, if Iset does not change from a positive value to a negative value, executing the following steps: assigning the state of the negative current loop to the positive current; the voltage loop is changed from negative saturation to positive saturation; the state of the negative power loop is assigned to the positive power loop.
And under the condition that the positive and negative values of the current of the battery to be detected do not jump, continuously calculating the voltage loop, the negative current loop, the positive current loop, the negative power loop and the positive power loop.
As shown in figure 3, the working principle of the loop is that the set current value Iset is stored in the CPU, the DSP performs assignment and calculation of the loop by detecting the sign conversion of the current value Iset, if the sign of the Iset is not changed, all loop calculations can be normally operated, the loop output acted after comparison is assigned to the DA so as to output corresponding PWM, and finally the loop output is recycled to the main loop, if the set Iset is changed, the last output state of all loops is assigned to the next output state, so that seamless connection of the loop output during charging and discharging (the sign of the current value Iset is changed) is ensured, and overshoot generated in the loop switching process can not occur.
By applying the embodiment of the invention, the charging and discharging voltage threshold of the battery is protected by the CC priority mode containing the voltage upper limit value VH and the voltage lower limit value VL, the zero current loop Izero control is added in the CC priority mode, and the zero current loop control is added under the CC priority mode, so that the situation that a client sets the upper limit and the lower limit of the voltage mistakenly is prevented, the machine can charge and discharge the object to be tested by the built-in Izero value of the DSP, the object to be tested is prevented from being charged and discharged by large current, the object to be tested is damaged, for example, Iset =5A is set to charge the object to be tested, and the value set by the VH is smaller than the object to be tested, at the moment, the machine is turned ON, the object to be tested is discharged but not charged, the magnitude of the discharged current is the built-in Izero value of the DSP but not the large value Imax of the peak current of the. As shown in fig. 5 and 6, Vset is used in the prior art, and VH/VL is not used, so that Vset and Iset need to be changed simultaneously if the charging and discharging states are changed in the prior art, and the charging and discharging states are changed only by changing Iset in the scheme of the invention; in the prior art, when the voltage setting for charging and discharging is wrong, the reverse maximum current value Imax is used for discharging and charging, so that the object to be measured and the power supply device are damaged.
As shown in fig. 4, in a specific implementation of the present invention, the CPU may implement storage of the lower limit VH and the lower limit VL of the received voltage and the current Iset through interactive communication with the operation interface, and then implement comparison between VH and VL and Vb through interaction between the CPU and the DSP, and determine whether Iset or the built-in minimum current value is used for charging and discharging in the DSP. The AC-DC is in the form of a module for converting an alternating voltage into a direct voltage; the DC-DC is in the form of a module and converts the direct-current voltage into required direct-current voltage; and the battery to be tested is connected with the DC-DC module.
As shown in fig. 1 and 4, a bidirectional power supply device of the present invention includes:
the main loop power conversion unit part comprises an AC-DC module and a DC-DC module, wherein the AC-DC module is used for converting alternating current voltage into direct current voltage; and the DC-DC module converts the direct-current voltage into required direct-current voltage, and is connected with the battery to be tested.
The DSP is used for carrying out PWM control on the DC-DC module to realize the charging and discharging of the power conversion unit on the battery to be detected, obtaining the voltage corresponding to the voltage to be detected and comparing the obtained voltage with a preset voltage upper limit value and a preset voltage lower limit value; when the preset current value Iset is not less than zero, the charging or discharging of the detection battery is adjusted to enable the charging voltage or the discharging voltage to reach the voltage upper limit value; when the preset current value is less than zero, the charging or discharging of the detection battery is adjusted to enable the charging voltage or the discharging voltage to reach the voltage lower limit value; and if the Iset positive and negative signs are changed, assigning the previous output state of the loop to the next output state so as to enable the loop output to be connected during charging and discharging.
And the DSP sends the judgment result to the CPU, the CPU receives the operation result of the DSP on the voltage or the current, receives the storage of the upper limit value of the voltage, the lower limit value of the voltage and the current value Iset by a user, and displays the current voltage and the current of the battery on an interface.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (11)

1. A bi-directional power supply apparatus, the apparatus comprising:
the power conversion unit is connected with an object to be detected, and the current flows in a bidirectional mode to charge and discharge the object to be detected;
the detection unit is coupled between the power conversion unit and the object to be detected and is used for detecting the voltage corresponding to the object to be detected;
the digital signal processing unit controls the power conversion unit to charge the object to be tested according to the stored positive current value of the current Iset until the voltage of the object to be tested reaches the stored upper voltage limit value VH; or controlling the power conversion unit to discharge the object to be tested according to the stored negative current value of the current Iset until the voltage of the object to be tested reaches the stored lower voltage limit value VL.
2. The bidirectional power supply apparatus according to claim 1, wherein: when the stored current Iset is a positive value and the voltage of the object to be detected is higher than the stored voltage upper limit value VH, discharging the object to be detected to the voltage upper limit value VH according to a current Izero-; when the stored current Iset is a negative value and the voltage of the object to be tested is lower than the stored lower voltage limit VL, the object to be tested is charged to the lower voltage limit VL according to a current Izero +.
3. The bidirectional power supply apparatus according to claim 2, wherein: the current values Izero-, Izero + are one small current value inside the digital signal processing unit, and-Imax < Izero- <0, 0< Izero + < + Imax, where Imax is the rated current of the power supply device.
4. A bi-directional power supply apparatus according to any one of claims 1 to 3, wherein: and when the digital signal processing unit detects the sign conversion of the stored current Iset, assigning the previous output state value of the loop to the next output state value.
5. The bi-directional power supply apparatus of claim 4, wherein the power unit comprises an AC-DC module and a DC-DC module, the AC-DC module being configured to convert an alternating current voltage into a direct current voltage; the DC-DC module is used for converting the direct-current voltage into required direct-current voltage; the DC-DC module is connected with an object to be tested.
6. The bidirectional power supply device according to claim 5, wherein the digital signal processing unit is a DSP, the DC-DC module is PWM-controlled, the DSP sends the determination result to the CPU, and the CPU receives the user's storage of the upper voltage limit, the lower voltage limit, and the current value Iset, and displays the current voltage and the charging/discharging current of the battery on the interface.
7. A control method of a bidirectional power supply device is characterized by comprising the following steps:
storing the current Iset, the upper voltage limit value VH and the lower voltage limit value VL;
when the stored current Iset > =0, judging that the detected voltage Vb of the object to be detected is smaller than the voltage upper limit value VH, and carrying out constant current charging on the object to be detected by using the stored current Iset until the charging voltage of the object to be detected reaches the voltage upper limit value;
and when the stored current Iset is less than 0, judging that the detected voltage Vb of the object to be detected is greater than the voltage lower limit value VL, and carrying out constant-current discharge on the object to be detected by using the stored current Iset until the discharge voltage of the object to be detected reaches the voltage lower limit value VL.
8. The control method of a bidirectional power supply apparatus according to claim 7, characterized in that:
when the stored current Iset > =0, judging that the detected voltage Vb of the object to be detected is larger than the voltage upper limit value VH, performing constant current discharge on the object to be detected by using an Izero-current value in the DSP until the discharge voltage of the object to be detected reaches the voltage upper limit value;
and when the stored current Iset is less than 0, judging that the voltage Vb of the detected object to be detected is less than the voltage lower limit value VL, carrying out constant current charging on the object to be detected by using the Izero + current value in the DSP until the charging voltage of the object to be detected reaches the voltage lower limit value.
9. The control method of a bidirectional power supply apparatus according to claim 7, characterized in that:
if Iset changes from positive to negative, the step is executed: assigning the output value of the positive current loop to the negative current loop; the voltage loop is changed from positive saturation to negative saturation; the output value of the positive power loop is assigned to the negative power loop.
10. The control method of a bidirectional power supply apparatus according to claim 7, characterized in that:
if Iset changes from positive value to negative value, executing the following steps: assigning the output value of the negative current loop to the positive current loop; the voltage loop is changed from negative saturation to positive saturation; the output value of the negative power loop is assigned to the positive power loop.
11. The control method of a bidirectional power supply apparatus according to claim 9 or 10, characterized in that: and under the condition that the positive and negative values of the stored current Iset do not jump, continuously executing the calculation of the original loop, wherein the original loop can be a voltage loop, a positive current loop, a negative current loop, a positive power loop and a negative power loop.
CN201911327791.8A 2019-12-20 2019-12-20 Bidirectional power supply device and control method thereof Pending CN111030225A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114325140A (en) * 2020-09-28 2022-04-12 艾乐德电子（南京）有限公司 Source-carrying all-in-one machine device
CN114355065A (en) * 2020-09-28 2022-04-15 艾乐德电子（南京）有限公司 Source-carrying all-in-one machine device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114325140A (en) * 2020-09-28 2022-04-12 艾乐德电子（南京）有限公司 Source-carrying all-in-one machine device
CN114355065A (en) * 2020-09-28 2022-04-15 艾乐德电子（南京）有限公司 Source-carrying all-in-one machine device

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