A high-frequency pulsed DC oscillation charging system controlled by PLC programming

Abstract

A high-frequency pulse DC oscillation charging system controlled by PLC programming. It is provided with a high-frequency pulse control output module, a three-phase transformer, and a high-frequency pulse charging module; the three-phase transformer includes an input coil and an output coil; the high-frequency pulse control output module includes a PS switching power supply, a PLC programmable controller, and a pulse boost transformer; the high-frequency pulse charging module includes two pulse DC oscillation charging circuits, each of which is connected in series with a three-phase transformer output coil, a charging battery pack, and a thyristor, and is connected in parallel with a second pulse DC control current; the thyristor includes an anode, a cathode, and a control electrode. The charging system adopts PLC high-frequency pulse output, and through the synchronous control circuit and the thyristor, it produces intermittent high-frequency and high-voltage pulse oscillation DC in the charging circuit to charge the battery pack, thereby greatly improving the battery charging current acceptance rate and realizing fast charging.

Description

Technical Field

[0001] The present invention relates to the field of electrical automation technology, and in particular to a charging device which adopts a PLC high-frequency pulse output voltage and uses a synchronous control circuit and a thyristor to produce an intermittent, sawtooth-shaped high-frequency high-voltage pulse oscillation direct current to charge a battery pack, thereby greatly improving the battery charging current acceptance rate and realizing fast charging. Background Art

[0002] Electric vehicles are currently widely promoted, energy-saving and environmentally friendly green travel vehicles. The charging device that comes with electric vehicles often takes 7-8 hours to charge once. The "ampere-hour rule" is generally used during charging. The charging current ampere should not exceed the ampere-hour of the battery to be charged, that is, it should not exceed the battery's ability to store electricity.

[0003] There are three charging methods: constant current charging method, constant voltage charging method, and stage charging method. At present, these three charging methods have certain shortcomings:

[0004] 1. Constant current charging method is a charging method that keeps the charging current intensity constant by adjusting the output voltage of the charging device or changing the resistance in series with the battery. Its control method is simple, but since the acceptable current capacity of the battery gradually decreases as the charging process proceeds, in the later stage of charging, the charging current is mostly used for electrolysis of water, thereby generating gas, causing excessive gas emission, and thus failing to achieve efficient charging;

[0005] 2. The stage charging method is a fast charging method that combines constant current and constant voltage. First, the first stage is charged with constant current to a predetermined voltage value, and then changed to constant voltage for the second stage constant voltage charging. Generally, the conversion voltage between the two stages is the constant voltage of the second stage. When the current decays to a predetermined value, it is switched from the second stage to the third stage for constant current charging. This method can minimize the gas output, but the process of this method is complicated and difficult to control, and is not suitable for fast charging.

[0006] 3. Constant voltage charging method. The voltage of the charging power supply keeps a constant value during the entire charging time. As the battery terminal voltage gradually increases, the current gradually decreases. Compared with the constant current charging method, its charging process is closer to the optimal charging curve. It uses constant voltage for fast charging. Since the battery electromotive force is low at the beginning of charging, the charging current is very large. As the charging progresses, the current will gradually decrease. Therefore, only a simple control system is required. This charging method uses very little electrolyzed water to avoid overcharging the battery. However, the current is too large at the beginning of charging, which has a great impact on the battery life and is easy to bend the battery plates, causing the battery to be scrapped. In view of this shortcoming, constant voltage charging is rarely used. It is only used when the charging power supply voltage is low and the current is large. For example, during the operation of a car, the battery is charged using the constant voltage charging method. Summary of the invention

[0007] The purpose of the present invention is to address the shortcomings of existing battery charging methods and provide an intermittent, sawtooth high-frequency pulse DC oscillation charging system controlled by PLC programming. The charging system uses a PLC programming controller to generate a high-frequency pulse output signal current, and through a synchronous control circuit and a thyristor, a high-frequency, high-voltage pulse DC oscillation current is produced to charge the battery pack, thereby greatly improving the battery charging current acceptance rate and achieving rapid charging.

[0008] In order to solve the above-mentioned prior art problems, the technical solution of the present invention is:

[0009] The present invention provides a high-frequency pulse DC oscillation charging system controlled by PLC programming, wherein the charging system is provided with a high-frequency pulse control output module, a three-phase transformer for AC boosting, and a high-frequency pulse charging module;

[0010] The three-phase transformer comprises an input coil and two output coils, and the input coil of the three-phase transformer is electrically connected to a 380V AC input power supply to form a current loop;

[0011] The high-frequency pulse control output module includes a PS switching power supply, a PLC programmable controller, and a pulse boost transformer. The input end of the PS switching power supply is electrically connected to the 220V AC input power supply to form a current loop. The PS switching power supply is at least provided with a rectifier for outputting 24V DC power to power the PLC programmable controller. The power input port of the PLC programmable controller is electrically connected to the output port of the PS switching power supply. The 220V AC power is rectified by the PS switching power supply and outputs 24V DC power, which is then input into the PLC programmable controller. The PLC programmable controller is used to generate a high-frequency pulse DC signal current and has two high-frequency pulse DC signal current output terminals. The PLC programmable controller includes a pulse current amplitude setting, a PWM signal frequency setting, and a PWM duty cycle setting. The charging system performs pulse current amplitude setting, PWM signal frequency setting, and PWM duty cycle setting through the PLC programmable controller. , output two groups of primary pulse DC signal currents, the primary pulse DC signal current is 20000 Hz, 0~5V pulse DC, the output end of the PLC programmable controller is electrically connected to the pulse boost transformer input coil, the primary pulse DC signal current is the input current of the pulse boost transformer, the two groups of primary pulse DC signal currents are amplified by the pulse boost transformer to generate two groups of second pulse DC control currents, the second pulse DC control current is 20000 Hz, 0~30V pulse DC, the positive and negative poles of the pulse boost transformer output coil are respectively electrically connected to the G control pole and K cathode of the thyristor to form a synchronous control circuit, the synchronous control circuit has a control interface electrically connected to the thyristor G control pole, the second pulse DC control voltage is connected to the thyristor G control pole through the control interface of the synchronous control circuit, thereby controlling the charging circuit to generate 20000 Hz, 0~1000V intermittent, sawtooth high-frequency high-voltage pulse DC oscillation charging current;

[0012] The high-frequency pulse charging module includes two pulse DC oscillation charging circuits, each of which is connected in series with a three-phase transformer output coil, a rechargeable battery pack, and a thyristor, and each of which is also connected in parallel with a second pulse DC control current. The charging system outputs 20,000 Hz, 0-1000 V intermittent, sharp pulse DC charging current through the three-phase transformer, the thyristor, and the second pulse DC control current;

[0013] The thyristor comprises an A anode, a K cathode, and a G control electrode. The A anode and the K cathode of the thyristor are connected in series to a pulse DC oscillation charging circuit. The thyristor G control electrode is electrically connected to the control interface of the synchronous control circuit. The PLC programmable controller is used to generate and output a 0-5V high-frequency pulse signal current and is electrically connected to the input coil of the pulse boost transformer.The input coil of the pulse boost transformer is electrically connected to the PLC programmable controller, the positive pole of the output coil is electrically connected to the control pole of the thyristor G, and the negative pole is electrically connected to the cathode of the thyristor K to form a synchronous control circuit, which is used to amplify the 0~5V high-frequency pulse signal current input by the PLC programmable controller, and output a 0~30V high-frequency pulse synchronous control voltage between the control pole of the thyristor G and the cathode of K. The synchronous control circuit includes a control interface, the control pole of the thyristor is electrically connected to the synchronous control circuit control interface, and the charging circuit includes the 0~5V high-frequency pulse signal voltage output by the PLC programmable controller, which is amplified by the boost transformer to form a 0~30V high-frequency pulse control voltage in the synchronous control circuit, and is transmitted to the synchronous control circuit by the synchronous control circuit. The control interface of the step control circuit is electrically connected to the G control electrode of the thyristor, and the on and off of the thyristor is controlled by inputting a 0~30V high-frequency control voltage to the G control electrode of the thyristor, and generating a 20000 Hz, 0~1000V intermittent, sawtooth sharp pulse DC oscillation charging current in the charging circuit. When the A anode or G control electrode of the thyristor is a positive voltage, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the on state. When the A anode or G control electrode of the thyristor is a negative voltage, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the off state. When the synchronous control circuit inputs a 0V voltage to the G control electrode of the thyristor, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the off state. When the voltage output by the synchronous control circuit to the G control electrode starts to increase from 0V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year. When the voltage output by the synchronous control circuit to the G control electrode increases to 30V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year to 1000V. Conversely, when the voltage output by the synchronous control circuit to the G control electrode starts to decrease from 30V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also decreases year-on-year from 1000V. When the voltage output by the synchronous control circuit to the G control electrode decreases to 0V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also decreases year-on-year to 0V. When the synchronous control circuit inputs a negative voltage to the thyristor G control electrode, The high-frequency high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the disconnected state. Since the thyristor has unidirectional conductivity, as the synchronous control circuit outputs the high-frequency pulse control voltage to the thyristor G control pole and changes regularly and repeatedly, the high-frequency high-voltage pulse DC oscillation charging circuit generates 20,000 Hz, 0-1000V intermittent, sawtooth sharp pulse DC oscillation charging current, which continuously charges the battery pack in a cycle, so that the oxygen and hydrogen produced by the chemical reaction of the battery have time to recombine and be absorbed, so that the concentration polarization and ohmic polarization are naturally eliminated, thereby reducing the internal pressure of the battery, so that the next round of high-frequency high-voltage DC pulse current charging can be carried out more smoothly, so that the battery can absorb more electricity. ;

[0014] Furthermore, the falling edge is a pulse segment where the pulse direct current drops from a maximum value to zero;

[0015] Furthermore, the PLC programmable controller includes but is not limited to: model 6ES7151-1BA02-0AB0, interface module IM 151-1.

[0016] The present invention provides a high-frequency pulse DC oscillation charging system controlled by PLC programming, which has the following beneficial effects:

[0017] 1. This charging method follows the inherent charging acceptance rate of the battery, and can improve the charging acceptance rate of the electric vehicle battery, breaking the limitation of the exponential charging acceptance curve of the battery. It uses a continuously circulating intermittent high-frequency, variable-voltage pulse DC to charge the battery, so that the oxygen and hydrogen produced by the chemical reaction of the battery have time to recombine and be absorbed, thereby eliminating the concentration polarization and ohmic polarization, thereby reducing the internal pressure of the battery, so that the next round of high-frequency, high-voltage DC pulse current charging can proceed more smoothly, so that the battery can absorb more electricity. Since the intermittent pulse method is used during charging, the battery has a more sufficient reaction time, reducing the amount of gas evolution, and improving the charging current acceptance rate of the battery;

[0018] 2. In the circuit control of the high-frequency, high-voltage DC pulse charging method, the pulse current amplitude, the frequency of the PWM signal, and the PWM duty cycle can be adjusted. At the same time, the intermittent charging stage is used to charge more electricity in a shorter time, realize fast charging, and improve the charging acceptance capacity of the battery;

[0019] 3. The use of continuously cyclic intermittent high-frequency, variable-voltage pulse DC oscillation charging can greatly accelerate the charging speed, eliminate lithium dendrites, and promote the formation of Li4.Si4 matrix structure, greatly increasing the charging capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a circuit diagram of a high-frequency pulsed DC oscillation charging system controlled by PLC programming according to the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with embodiments: Example

[0022] like Figure 1 The present invention provides a high-frequency pulse DC oscillation charging system controlled by PLC programming, wherein the charging system is provided with a high-frequency pulse control output module, a three-phase transformer T4 for AC boosting, and a high-frequency pulse charging module;

[0023] The three-phase transformer T4 includes an input coil and two output coils. The input coil of the three-phase transformer is electrically connected to a 380V AC input power supply to form a current loop.

[0024] The high-frequency pulse control output module includes a PS switching power supply V5, a programmable controller PLC, and a pulse boost transformer T1. The input end of the PS switching power supply is electrically connected to a 220V AC input power supply to form a current loop. The PS switching power supply is at least provided with a rectifier to output 24V DC power to power the PLC programmable controller. The power input port of the PLC programmable controller is electrically connected to the output port of the PS switching power supply. The 220V AC power is rectified by the PS switching power supply and outputs 24V DC power, which is then input into the PLC programmable controller. The PLC programmable controller is used to generate a high-frequency pulse DC signal current and has two high-frequency pulse DC signal current output terminals. Q0.0, Q0.1, the PLC programmable controller includes pulse current amplitude setting, PWM signal frequency setting, and PWM duty cycle setting. The charging system performs pulse current amplitude setting, PWM signal frequency setting, and PWM duty cycle setting through the PLC programmable controller, and outputs two groups of primary pulse DC signal currents. The primary pulse DC signal current is 20000 Hz, 0~5V pulse DC. The primary pulse DC signal current is the input current of the pulse boosting transformer. The two groups of primary pulse DC signal currents are amplified by the pulse boosting transformer to generate two groups of second pulse DC control currents. The second pulse DC control current is 20000 Hz, 0~30V pulse DC.

[0025] The high-frequency pulse charging module includes two pulse DC oscillation charging circuits, each of which is connected in series with a three-phase transformer output coil, a rechargeable battery pack, and a thyristor V1 or V6, and a second pulse DC control current is also connected in parallel with the single pulse DC oscillation charging circuit. The charging system outputs 20,000 Hz, 0-1000 V intermittent, sawtooth sharp pulse DC oscillation charging current through the three-phase transformer, the thyristor and the second pulse DC control current;

[0026] The thyristor V1 or V6 includes an A anode, a K cathode, and a G control electrode respectively. The A anode and the K cathode of the thyristor are connected in series to a pulse DC oscillation charging circuit. The thyristor G control electrode is electrically connected to the control interface of the synchronous control circuit. The PLC programmable controller is used to generate and output a 0-5V high-frequency pulse signal current and is electrically connected to the input coil of the pulse boost transformer;The input coil of the pulse boost transformer is electrically connected to the PLC programmable controller, the positive pole of the output coil is electrically connected to the control pole of the thyristor G, and the negative pole is electrically connected to the cathode of the thyristor K to form a synchronous control circuit, which is used to amplify the 0~5V high-frequency pulse signal current input by the PLC programmable controller, and output a 0~30V high-frequency pulse synchronous control voltage between the control pole of the thyristor G and the cathode of K. The synchronous control circuit includes a control interface, the control pole of the thyristor is electrically connected to the synchronous control circuit control interface, and the charging circuit includes the 0~5V high-frequency pulse signal voltage output by the PLC programmable controller, which is amplified by the boost transformer to form a 0~30V high-frequency pulse control voltage in the synchronous control circuit, and is transmitted to the synchronous control circuit by the synchronous control circuit. The control interface of the step control circuit is electrically connected to the G control electrode of the thyristor, and the on and off of the thyristor is controlled by inputting a 0~30V high-frequency control voltage to the G control electrode of the thyristor, and generating a 20000 Hz, 0~1000V intermittent, sawtooth sharp pulse DC oscillation charging current in the charging circuit. When the A anode or G control electrode of the thyristor is a positive voltage, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the on state. When the A anode or G control electrode of the thyristor is a negative voltage, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the off state. When the synchronous control circuit inputs a 0V voltage to the G control electrode of the thyristor, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the off state. When the voltage output by the synchronous control circuit to the G control electrode starts to increase from 0V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year. When the voltage output by the synchronous control circuit to the G control electrode increases to 30V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year to 1000V. Conversely, when the voltage output by the synchronous control circuit to the G control electrode starts to decrease from 30V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also decreases year-on-year from 1000V. When the voltage output by the synchronous control circuit to the G control electrode decreases to 0V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also decreases year-on-year to 0V. When the synchronous control circuit inputs a negative voltage to the thyristor G control electrode, The high-frequency high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the disconnected state. Since the thyristor has unidirectional conductivity, as the synchronous control circuit outputs the high-frequency pulse control voltage to the thyristor G control pole and changes regularly and repeatedly, the high-frequency high-voltage pulse DC oscillation charging circuit generates 20,000 Hz, 0-1000V intermittent, sawtooth sharp pulse DC oscillation charging current, which continuously charges the battery pack in a cycle, so that the oxygen and hydrogen produced by the chemical reaction of the battery have time to recombine and be absorbed, so that the concentration polarization and ohmic polarization are naturally eliminated, thereby reducing the internal pressure of the battery, so that the next round of high-frequency high-voltage DC pulse current charging can be carried out more smoothly, so that the battery can absorb more electricity. ;

[0027] The model of the PLC programmable controller is 6ES7151-1BA02-0AB0 and the interface module is IM 151-1.

[0028] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, any addition, reduction or replacement of general technical means made according to the scope of this application should still fall within the scope of the present invention.

Claims

1. A high-frequency pulse DC oscillation charging system controlled by PLC programming, characterized in that: The charging system is provided with a high-frequency pulse control output module, a three-phase transformer for AC boosting, and a high-frequency pulse charging module; The three-phase transformer comprises an input coil and two output coils, and the input coil of the three-phase transformer is electrically connected to a 380V AC input power supply to form a current loop; The high-frequency pulse control output module includes a PS switching power supply, a PLC programmable controller, and a pulse boost transformer. The input end of the PS switching power supply is electrically connected to a 220V AC input power supply to form a current loop. The PS switching power supply is at least provided with a rectifier for outputting 24V DC power to power the PLC programmable controller. The power input port of the PLC programmable controller is electrically connected to the output port of the PS switching power supply. The 220V AC power is rectified by the PS switching power supply and outputs 24V DC power, which is then input into the PLC programmable controller. The PLC programmable controller is used to generate a high-frequency pulse DC signal current and has two high-frequency pulse DC signal current output terminals. The PLC programmable controller The controller includes a pulse current amplitude setting, a PWM signal frequency setting, and a PWM duty cycle setting. The charging system performs pulse current amplitude setting, PWM signal frequency setting, and PWM duty cycle setting through a PLC programmable controller, and outputs two groups of primary pulse DC signal currents. The primary pulse DC signal current is 20,000 Hz and 0-5V pulse DC. The pulse boosting transformer is arranged at the output end of the PLC programmable controller. The primary pulse DC signal current is the input current of the pulse boosting transformer. The two groups of primary pulse DC signal currents are amplified by the pulse boosting transformer to generate two groups of second pulse DC control currents. The second pulse DC control current is 20,000 Hz and 0-30V pulse DC. The high-frequency pulse charging module includes two pulse DC oscillation charging circuits, each of which is connected in series with a three-phase transformer output coil, a rechargeable battery pack, and a thyristor, and each of which is also connected in parallel with a second pulse DC control current. The charging system outputs 20,000 Hz, 0-1000 V intermittent, sawtooth sharp pulse DC oscillation charging current through the three-phase transformer, the thyristor, and the second pulse DC control current; The thyristor includes an A anode, a K cathode, and a G control electrode. The A anode and the K cathode of the thyristor are connected in series to a pulse DC oscillation charging circuit. The high-frequency pulse control output module also includes a synchronous control circuit. The synchronous control circuit includes a control interface. The thyristor G control electrode is electrically connected to the synchronous control circuit control interface. The PLC programmable controller is used to generate and output a 0-5V high-frequency pulse signal current and is electrically connected to the input coil of the pulse boosting transformer; the input coil of the pulse boosting transformer is electrically connected to the PLC programmable controller, and the positive pole of its output coil is electrically connected to the thyristor G control electrode, and the negative pole is electrically connected to the thyristor K cathode to form a synchronous control circuit for converting the 0-5V high-frequency current input by the PLC programmable controller into a high-frequency current. The pulse signal current is amplified, and a 0~30V high-frequency pulse synchronous control voltage is output between the thyristor G control electrode and the K cathode. The thyristor control electrode is electrically connected to the synchronous control circuit control interface. The PLC programmable controller outputs a 0~5V high-frequency pulse signal voltage, which is amplified by a step-up transformer to form a 0~30V high-frequency pulse control voltage in the synchronous control circuit, and is electrically connected to the thyristor G control electrode through the synchronous control circuit control interface. The thyristor is turned on and off by inputting a 0~30V high-frequency control voltage to the thyristor G control electrode, and a 20000 Hz, 0~1000V intermittent, sawtooth sharp pulse DC oscillation charging current is generated in the charging circuit. When the A anode or G control electrode of the thyristor is a positive voltage, the high frequency The high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the on state. When the A anode or G control pole of the thyristor is at a negative voltage, the high-frequency high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are in the off state. When the synchronous control circuit inputs a voltage of 0V to the thyristor G control pole, the high-frequency high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the off state. When the voltage output by the synchronous control circuit to the G control pole increases from 0V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year. When the voltage output by the synchronous control circuit to the G control pole increases to 30V, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year to 1000V. Conversely, when the synchronous control circuit outputs a voltage of 0V to the G control pole, the voltage of the high-frequency high-voltage pulse DC oscillation charging circuit also increases year-on-year to 1000V. The voltage of the control electrode starts to drop from 30V, and the voltage of the high-frequency and high-voltage pulse DC oscillation charging circuit also drops from 1000V year-on-year. When the voltage output by the synchronous control circuit to the G control electrode drops to 0V, the voltage of the high-frequency and high-voltage pulse DC oscillation charging circuit also drops to 0V year-on-year. When the synchronous control circuit inputs a negative voltage to the thyristor G control electrode, the high-frequency and high-voltage pulse DC oscillation charging circuit and the synchronous control circuit are both in the disconnected state. Since the thyristor has unidirectional conductivity, as the synchronous control circuit outputs regular and repeated changes in the high-frequency pulse control voltage to the thyristor G control electrode, the high-frequency and high-voltage pulse DC oscillation charging circuit generates a 20,000 Hz, 0~1000V intermittent, sawtooth sharp pulse DC oscillation charging current.

2. A high-frequency pulse DC oscillation charging system controlled by PLC programming according to claim 1, characterized in that: The falling edge of the 20000 Hz, 0-1000 V intermittent, sawtooth sharp pulse DC oscillation charging current is a pulse segment where the pulse DC voltage drops from a maximum value to zero.

3. A high-frequency pulse DC oscillation charging system controlled by PLC programming according to claim 1, characterized in that: The rising edge of the 20000 Hz, 0-1000 V intermittent, sawtooth sharp pulse DC oscillation charging current is the pulse segment where the pulse DC voltage rises from zero to the maximum value.

4. A high-frequency pulsed DC oscillation charging system controlled by PLC programming according to claim 1, characterized in that: The PLC programmable controller includes but is not limited to: model 6ES7151-1BA02-0AB0, interface module IM 151-1.

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