CN112526963A - Testing method of solar charge and discharge controller - Google Patents
Testing method of solar charge and discharge controller Download PDFInfo
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- CN112526963A CN112526963A CN202011148587.2A CN202011148587A CN112526963A CN 112526963 A CN112526963 A CN 112526963A CN 202011148587 A CN202011148587 A CN 202011148587A CN 112526963 A CN112526963 A CN 112526963A
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- current
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- storage battery
- power supply
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a method for testing a solar charge-discharge controller, which comprises the following steps: connecting the positive and negative poles of the power supply output end to the positive and negative poles of the storage battery end of the controller; after the no-load current of the test controller is qualified, the anode and the cathode of the constant current source are respectively connected to the cathode of the load end and the cathode of the solar panel end; observing the error value of the current detection of the controller; testing the loop voltage drop between the negative electrode of the load end and the negative electrode of the solar cell panel end; the phenomena of over-discharge and under-voltage recovery power supply functions of the storage battery and full charge of the storage battery are simulated. The invention adopts the adjustable constant current source as the charging current source and the discharging current source, so that the circuit effectively determines the quality of the control loop through the rated current, adopts the adjustable direct current stabilized power supply to replace the storage battery, can quickly change between any voltage points, and effectively improves the condition that the voltage can be changed only through charging and discharging by adopting the storage battery as the power supply.
Description
Technical Field
The invention relates to the technical field of testing of solar charge and discharge controllers, in particular to a testing method of a solar charge and discharge controller.
Background
The existing solar charging and discharging controller generally simulates a solar current board through a high-power direct-current stabilized power supply to be connected to the controller to charge a storage battery during testing, and then discharges the storage battery through an electronic load or a DC-AC inverter at a load end of the controller, so that the charging and discharging function test of the solar controller is carried out by the method.
However, when a relatively large solar controller is tested, the method has high requirements on a voltage-stabilized power supply, a storage battery pack and a direct-current load, and the charging and discharging of large current not only can seriously shorten the service life of the storage battery, but also can generate relatively large electric energy loss in the test. And the process of full charge and emptying of the battery is not easy to control, so that the time for testing the controller is prolonged, and the testing efficiency is influenced.
Disclosure of Invention
The invention aims to solve the problems that the service life of a storage battery is shortened easily when a high-power direct-current stabilized power supply simulates a solar current board to be connected with a controller to charge the storage battery, and the process of full charging and emptying of the storage battery is not controlled.
In order to achieve the purpose, the invention adopts the following technical scheme: the testing method of the solar charge-discharge controller comprises the following steps:
the method comprises the following steps: adjusting the voltage of the direct-current stabilized voltage supply to 12V, and connecting the positive electrode and the negative electrode of the power supply output end to the positive electrode and the negative electrode of the storage battery end of the solar controller;
step two: after the no-load current of the solar controller is tested to be qualified, connecting the anode of the adjustable constant current source to the cathode of the load end, and connecting the cathode of the adjustable constant current source to the cathode of the solar panel end;
step three: observing the error value of the current detection of the solar controller after the current reaches a rated value, and observing whether the current detected by the solar controller is consistent with the current normally output by the adjustable constant current source;
step four: testing the loop voltage drop between the negative electrode of the load end and the negative electrode of the solar cell panel end by using a universal meter, and judging whether all the MOS tubes are normally conducted, whether the welding is good or not and whether the MOS tubes are correctly used or not;
step five: regulating the voltage of the direct-current stabilized power supply to 10.9V to simulate the over-discharge phenomenon of the storage battery;
step six: regulating the voltage of the direct-current stabilized power supply to 12.6V, and simulating the under-voltage recovery power supply function of the storage battery;
step seven: adjusting the current value of the adjustable constant current source to be 1 time of the rated current value of the solar controller;
step eight: and regulating the voltage of the direct-current stabilized power supply to a floating charge control point of the solar controller to simulate that the storage battery is fully charged.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. in the invention, the adjustable constant current source is used as a charging current source and a discharging current source, so that the circuit can effectively determine the quality of the control loop through rated current.
2. The invention adopts the adjustable direct current stabilized voltage power supply to replace the storage battery, can change between any voltage points quickly, and effectively improves the condition that the voltage can be changed only by charging and discharging if the storage battery is adopted as a power supply. Compared with the storage battery, the voltage value is more accurately and quickly changed.
3. According to the invention, the adjustable constant current source is connected to the control end, so that the current can be more accurately calibrated, and the phenomenon that the normal change of the power supply cannot be accurately observed due to unstable charging and discharging current caused by the adoption of a high-power direct current stabilized power supply, an electronic load and a storage battery pack is avoided.
4. According to the invention, the energy of the adjustable current source is safe and controllable, and the fault of a problem product cannot be expanded when destructive testing is carried out.
Drawings
Fig. 1 is a block diagram of a testing apparatus of a solar charge-discharge controller 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.
The first embodiment is as follows:
referring to fig. 1, the method for testing a solar charging and discharging controller includes the following steps:
the method comprises the following steps: and adjusting the voltage of the direct current stabilized power supply to 12V, connecting the positive electrode and the negative electrode of the power supply output end to the positive electrode and the negative electrode of the storage battery end of the solar controller, and simulating the storage battery by using the direct current stabilized power supply. At the moment, whether the current on the ammeter of the stabilized voltage supply is less than or equal to 12mA is observed, if the current is more than 12mA, the no-load loss of the solar controller is unqualified, and other problems may exist in the circuit;
step two: and after the no-load current of the solar controller is tested to be qualified, the anode of the adjustable constant current source is connected to the cathode of the load end, the cathode of the adjustable constant current source is connected to the cathode of the solar panel end, the solar controller detects that the voltage of the solar panel end is greater than the voltage of the storage battery at the moment, normal charging and discharging can be realized, the MCU in the solar controller sends a signal to enable the control MOS to be completely conducted, and the current of the adjustable constant current source flows through the control loop of the control. If the charge and discharge control circuit has problems, the current may be 0 or not reach the rated value;
step three: when the current reaches a rated value, observing the error value of the current detection of the solar controller, and observing whether the current detected by the solar controller is consistent with the current normally output by the adjustable constant current source, wherein the error is less than or equal to 2%;
step four: the universal meter is used for testing the loop voltage drop between the negative electrode of the load end and the negative electrode of the solar cell panel end, whether all MOS tubes are normally conducted or not is judged, whether welding is good or not is judged, whether the MOS tubes are correctly used or not is judged, the loop voltage drop value is 300mV (products of different models have differences), and if the loop voltage drop is too large, the situation that circuit welding is poor, MOS tube type numbers are mistakenly used or MOS is not normally conducted is possible. If the loop voltage drop is too small, the models of the MOS tubes are possibly wrong, the MOS tubes are welded and short-circuited, and the following operations are carried out after the faults need to be eliminated;
step five: the voltage of the direct-current stabilized power supply is regulated to 10.9V, the over-discharge phenomenon of the storage battery is simulated, the MOS tube at the load end is closed, the loop of the whole adjustable constant-current source is disconnected, the current is 0, and the low-voltage turn-off function of the load is qualified. If the current is not 0, the control loop of the MOS tube has a problem or a detection circuit of the voltage of the storage battery has a problem;
step six: regulating the voltage of the direct-current stabilized power supply to 12.6V, simulating the under-voltage recovery power supply function of the storage battery, opening the discharge MOS once again, and conducting the constant-current loop once again;
step seven: the current value of the adjustable constant current source is adjusted to be 1 time of the rated current value of the solar controller, the controller MCU can recognize an overcurrent signal, and the discharge MOS is closed to carry out overcurrent alarm. The adjustable constant current source circuit is recovered to the rated current, the fault can be unlocked through a key of the controller, and the current loop is recovered to be normal;
step eight: the voltage of the direct-current stabilized voltage supply is regulated to a floating charge control point of the solar controller, the simulation storage battery is fully charged, the charge control MOS is in a PWM (pulse width modulation) switching state at the moment, the current is gradually reduced along with the rise of the voltage, and when the voltage is regulated to be fully charged to a disconnection point, the current is 0. When the voltage of the stabilized voltage supply is regulated to be below the floating charge control point, the constant current loop can be restored to a conducting state again.
The controller of the solar charging and discharging controller is characterized in that a current source is introduced, and the current source is switched on and off under the control of the controller, so that the controller can normally determine the quality of the controller through rated current without additionally using a high-power voltage-stabilized power supply, a large-capacity storage battery and an electronic load. The energy of the current source is controllable, and when the overcurrent protection test is carried out, a problem product can be effectively tested without enlarging faults. The controller is used for controlling charging and discharging by detecting the voltage of the storage battery, and the passing current does not influence the voltage detection and the circuit control. The storage battery is replaced by the direct-current stabilized voltage supply, so that each key voltage test point can be simulated more quickly, and the test efficiency of the controller is greatly improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. The method for testing the solar charging and discharging controller is characterized by comprising the following steps of:
the method comprises the following steps: adjusting the voltage of the direct-current stabilized voltage supply to 12V, and connecting the positive electrode and the negative electrode of the power supply output end to the positive electrode and the negative electrode of the storage battery end of the solar controller;
step two: after the no-load current of the solar controller is tested to be qualified, connecting the anode of the adjustable constant current source to the cathode of the load end, and connecting the cathode of the adjustable constant current source to the cathode of the solar panel end;
step three: observing the error value of the current detection of the solar controller after the current reaches a rated value, and observing whether the current detected by the solar controller is consistent with the current normally output by the adjustable constant current source;
step four: testing the loop voltage drop between the negative electrode of the load end and the negative electrode of the solar cell panel end by using a universal meter, and judging whether all the MOS tubes are normally conducted, whether the welding is good or not and whether the MOS tubes are correctly used or not;
step five: regulating the voltage of the direct-current stabilized power supply to 10.9V to simulate the over-discharge phenomenon of the storage battery;
step six: regulating the voltage of the direct-current stabilized power supply to 12.6V, and simulating the under-voltage recovery power supply function of the storage battery;
step seven: adjusting the current value of the adjustable constant current source to be 1 time of the rated current value of the solar controller;
step eight: and regulating the voltage of the direct-current stabilized power supply to a floating charge control point of the solar controller to simulate that the storage battery is fully charged.
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2020
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