High-precision high-voltage charging control device

Abstract

The utility model relates to a high-precision high-voltage charging control device, which comprises an LC filter circuit, a full-bridge inverter circuit, an LC resonance circuit, a boosting transformer, a rectifying circuit, a load, a voltage divider, a signal conditioning circuit, an AD sampling circuit, a processing chip and a driving circuit. The bus input end is connected with the full-bridge inverter circuit through the LC filter circuit, the full-bridge inverter circuit is connected with the step-up transformer through the LC resonant circuit, and the step-up transformer is connected with the load through the rectifying circuit. The voltage divider is connected with a load, the voltage divider is connected with the AD sampling circuit through the signal conditioning circuit, the AD sampling circuit is connected with the processing chip, and the processing chip is connected with the full-bridge inverter circuit through the driving circuit. According to the high-precision high-voltage charging control device, feedback control is performed on the charging circuit after feedback signals are processed through the processing chip, so that the load state is monitored in real time, charging parameters are automatically adjusted, the safety and the high efficiency of the charging process are ensured, and high-power and high-precision charging control is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of charging equipment, in particular to a high-precision and high-voltage charging control device. Background Art

[0002] With the rapid development of pulse power technology, the demand for charging high-power loads is increasing. Traditional charging technology has been unable to meet the high requirements of the pulse power field for charging speed, charging efficiency, and charging safety. In the existing technology, the charging circuit is directly regulated by the power management unit. For high-power loads, high-voltage charging is required. Conventional power management units are directly connected to the load and obtain feedback signals from the load. The accuracy of the feedback signals collected by the power management unit is not high. As a result, when charging different loads, it is difficult for the power management unit to accurately adjust the charging parameters to ensure charging speed, charging efficiency, and charging safety. Utility Model Content

[0003] The utility model provides a high-precision and high-voltage charging control device to address the technical problem in the prior art that when charging different loads, the power management unit is difficult to accurately adjust the charging parameters to ensure the charging speed, charging efficiency and charging safety.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A high-precision, high-voltage charging control device, comprising: an LC filter circuit, a full-bridge inverter circuit, an LC resonant circuit, a step-up transformer, a rectifier circuit, a load, a voltage divider, a signal conditioning circuit, an AD sampling circuit, a processing chip, and a drive circuit;

[0006] The bus input end is connected to the full-bridge inverter circuit through the LC filter circuit, the full-bridge inverter circuit is connected to the step-up transformer through the LC resonant circuit, and the step-up transformer is connected to the load through the rectifier circuit;

[0007] The voltage divider is connected to the load, the voltage divider is connected to the AD sampling circuit through the signal conditioning circuit, the AD sampling circuit is connected to the processing chip, and the processing chip is connected to the full-bridge inverter circuit through the driving circuit.

[0008] Furthermore: the voltage divider includes: a first voltage dividing branch, a second voltage dividing branch and a third voltage dividing branch;

[0009] One end of the first voltage dividing branch is connected to the high voltage input end of the load, the other end of the first voltage dividing branch is connected to one end of the second voltage dividing branch, and the other end of the second voltage dividing branch is connected to the signal conditioning circuit and outputs a positive signal;

[0010] The first voltage dividing branch includes a plurality of first voltage dividing components connected in series;

[0011] The second voltage dividing branch includes a plurality of second voltage dividing components connected in series;

[0012] The third voltage dividing branch includes a plurality of third voltage dividing components connected in series,

[0013] One end of the third voltage dividing branch is connected to the common connection end of the first voltage dividing branch and the second voltage dividing branch through a fourth voltage dividing component; the other end of the third voltage dividing branch is connected to the signal conditioning circuit and outputs a negative signal; the common connection end of the third voltage dividing branch and the fourth voltage dividing component is grounded;

[0014] The first voltage dividing component, the second voltage dividing component, the third voltage dividing component and the fourth voltage dividing component respectively include two resistors connected in parallel.

[0015] Furthermore: the first voltage dividing component is provided with 100 strings;

[0016] The second voltage dividing component and the third voltage dividing component are respectively provided with 9 strings.

[0017] Furthermore, the resistance values of the two parallel resistors in the first voltage divider component are 470 kΩ respectively; the resistance values of the two parallel resistors in the second voltage divider component, the third voltage divider component and the fourth voltage divider component are 47 kΩ respectively.

[0018] Furthermore, the resistors in the first voltage-dividing component, the second voltage-dividing component, the third voltage-dividing component and the fourth voltage-dividing component are all resistors with a temperature drift level of 25 ppm / °C.

[0019] The high-precision high-voltage charging control device provided by the utility model has at least the following beneficial effects or advantages:

[0020] The utility model provides a high-precision, high-voltage charging control device. The busbar input end is connected to a full-bridge inverter circuit via an LC filter circuit. The full-bridge inverter circuit is connected to a step-up transformer via an LC resonant circuit. The step-up transformer is connected to a load via a rectifier circuit. A voltage divider is connected to the load, and the voltage divider is connected to an AD sampling circuit via a signal conditioning circuit. The AD sampling circuit is connected to a processing chip, and the processing chip is connected to the full-bridge inverter circuit via a drive circuit. This high-precision, high-voltage charging control device has a voltage divider that reduces resistance voltage division errors, improving the accuracy of the voltage divider. A signal conditioning circuit is provided to further reduce resistance errors. The device can provide a high-precision feedback signal, which is processed by the processing chip and then used to feedback control the charging circuit. This allows for real-time monitoring of the load status and automatic adjustment of charging parameters, ensuring the safety and efficiency of the charging process and achieving high-power, high-precision charging control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A structural block diagram of a high-precision, high-voltage charging control device provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the voltage divider structure provided by an embodiment of the present utility model;

[0023] Figure 3 A schematic diagram of the signal conditioning circuit structure provided for an embodiment of the utility model. DETAILED DESCRIPTION

[0024] The utility model provides a high-precision and high-voltage charging control device to address the technical problem in the prior art that when charging different loads, the power management unit is difficult to accurately adjust the charging parameters to ensure the charging speed, charging efficiency and charging safety.

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1 and Figure 2 As shown, the embodiment of the present invention provides a high-precision high-voltage charging control device, including: an LC filter circuit, a full-bridge inverter circuit, an LC resonant circuit, a step-up transformer, a rectifier circuit, a load, a voltage divider, a signal conditioning circuit, an AD sampling circuit, a processing chip, and a drive circuit. Among them:

[0027] The bus input end is connected to the full-bridge inverter circuit through an LC filter circuit, the full-bridge inverter circuit is connected to the step-up transformer through an LC resonant circuit, and the step-up transformer is connected to the load through a rectifier circuit.

[0028] The voltage divider is connected to the load, the voltage divider is connected to the AD sampling circuit through the signal conditioning circuit, the AD sampling circuit is connected to the processing chip, and the processing chip is connected to the full-bridge inverter circuit through the driving circuit.

[0029] Specifically, such as Figure 2As shown, the voltage divider includes: a first voltage divider branch 1, a second voltage divider branch 2, and a third voltage divider branch 3. One end of the first voltage divider branch 1 is connected to the high-voltage input terminal of the load, the other end of the first voltage divider branch 1 is connected to one end of the second voltage divider branch 2, and the other end of the second voltage divider branch 2 is connected to the signal conditioning circuit and outputs a positive signal. The first voltage divider branch 1 includes multiple first voltage divider components connected in series; the second voltage divider branch 2 includes multiple second voltage divider components connected in series; and the third voltage divider branch 3 includes multiple third voltage divider components connected in series. One end of the third voltage divider branch 3 is connected to the common connection terminal of the first voltage divider branch 1 and the second voltage divider branch 2 through a fourth voltage divider component; the other end of the third voltage divider branch 3 is connected to the signal conditioning circuit and outputs a negative signal; the common connection terminal of the third voltage divider branch 3 and the fourth voltage divider component is grounded. The first, second, third, and fourth voltage divider components each include two resistors connected in parallel.

[0030] In this embodiment, the first voltage divider assembly has 100 resistors in series; the second and third voltage dividers each have 9 resistors in series. The two parallel resistors in the first voltage divider assembly each have a resistance of 470 kΩ; the two parallel resistors in the second, third, and fourth voltage dividers each have a resistance of 47 kΩ. The resistors in the first, second, third, and fourth voltage dividers all have a temperature drift rating of 25 ppm / °C.

[0031] The charging voltage is calibrated at 25°C. The operating temperature range is -20°C to +50°C. When the operating temperature is -20°C, the maximum temperature difference is 45°C. This is used to calculate the resistor divider error, X1. X1 = 25ppm / °C × 45°C = 1125ppm, which equals 1.125‰. Under the maximum temperature difference, the resistor error does not exceed 1.125‰. As the ambient temperature changes, the resistance values of the low-voltage and high-voltage arm resistors increase and decrease simultaneously with the temperature, resulting in a voltage divider accuracy far better than 1.125‰.

[0032] like Figure 3 As shown in the figure, the INA128UA is used for signal conditioning to improve accuracy. The maximum bias current is ±10nA, which, compared to the sampling current of 1mA, results in an error of 0.01‰. The signal conditioning circuit's resistance error is: X² = 10ppm / °C × 45°C = 450ppm, which equals 0.45‰.

[0033] To ensure accuracy, AD sampling uses a 16-bit ADC sampling chip with a resolution of 1 / 65535. Taking into account the presence of a sign bit, if only 15 bits are used to display the value, the resolution is still 1 / 32768, or 0.03‰.

[0034] Voltage Regulation:

[0035] The high-voltage charging module adopts an LC series resonant power topology with strong short-circuit resistance. To achieve soft switching, the high-voltage charging module drive signal must be fully output. The energy of the single pulse output by the high-voltage charging module determines the voltage increment step of the load capacitor.

[0036] The high-voltage charging module contains three high-voltage charging units with parallel output (each high-voltage charging unit consists of four high-voltage charging module sub-modules with staggered parallel output, with a maximum operating frequency of 80kHz), sharing a common controller. A single high-voltage charging module was selected as the object for accuracy analysis. When the load capacitance is constant, the greater the charging current, the more difficult it is to meet the charging accuracy. Based on this, the impact of a single pulse on the charging accuracy can be calculated. According to the technical solution section, the corresponding charging capacitance of a single high-voltage charging module is 65mF, and the corresponding capacitance of a single charging module is 21.7mF. The maximum charging current of the charging power supply is 185.2A, and the charging current of each of the three single modules is 61.8A.

[0037] To improve accuracy, the high-voltage charging module has a maximum operating frequency of 80kHz (Δt = 12.5μs), a minimum voltage step size, a control response time of 600μs, a minimum single-step voltage of , and a voltage regulation accuracy of . Because the charging process begins with constant current charging and then reaches peak power, power limiting reduces the charging current, resulting in a minimum voltage step size of less than 0.0356V and an accuracy better than 0.26.

[0038] Control accuracy:

[0039] When the charging voltage approaches the set value, a charge-reaching threshold interval is set to prevent overcharging. When the charging voltage reaches the threshold interval, the charge is considered reached. To ensure accuracy, the maximum range of the charge-reaching threshold interval in the current program is ±3V. Based on a full-scale range of 6.5kV, the control accuracy is 0.46.

[0040] Charging accuracy calculation:

[0041] As for charging accuracy, combined with the above analysis, since the equipment is calibrated at room temperature of 25°C, under working conditions of -20~50°C, when the working environment temperature is -20°C, there is a maximum error, that is, the resistance voltage division accuracy is 0.45‰, the signal conditioning accuracy is 0.01‰, the AD sampling accuracy is 0.03‰, the voltage regulation accuracy is 0.26, and the control accuracy is 0.46. When all errors shift in the same direction, there is a maximum error Xmax: Xmax=(1+1.125‰)×(1+0.01‰)×(1+0.45‰)×(1+0.03‰)×(1+0.26‰)×(1+0.46‰)-1=2.34‰. Therefore, the charging accuracy is better than 2.34‰ in the full range of -20~50℃. By selecting sampling resistors with low temperature drift, choosing high-precision sampling modules and signal conditioning modules, increasing the maximum operating frequency of the charging module, shortening the control response time, and limiting the charging value determination interval, high-precision control of the high-voltage charging system is achieved.

[0042] The high-precision high-voltage charging control device provided by the embodiment of the utility model has at least the following beneficial effects or advantages:

[0043] The high-precision, high-voltage charging control device provided by the present invention has a busbar input terminal connected to a full-bridge inverter circuit via an LC filter circuit, the full-bridge inverter circuit connected to a step-up transformer via an LC resonant circuit, and the step-up transformer connected to a load via a rectifier circuit. A voltage divider is connected to the load, the voltage divider is connected to an AD sampling circuit via a signal conditioning circuit, the AD sampling circuit is connected to a processing chip, and the processing chip is connected to the full-bridge inverter circuit via a drive circuit. The high-precision, high-voltage charging control device has a voltage divider that can reduce the error of the resistor voltage divider, thereby improving the accuracy of the voltage divider; a signal conditioning circuit is provided to further reduce the resistance error; and a high-precision feedback signal is provided. The processing chip processes the feedback signal and then performs feedback control on the charging circuit, thereby monitoring the load status in real time and automatically adjusting the charging parameters to ensure the safety and efficiency of the charging process, thereby achieving high-power, high-precision charging control.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-precision high-voltage charging control device, characterized in that: include: LC filter circuit, full-bridge inverter circuit, LC resonant circuit, boost transformer, rectifier circuit, load, voltage divider, signal conditioning circuit, AD sampling circuit, processing chip and drive circuit; The bus input end is connected to the full-bridge inverter circuit through the LC filter circuit, the full-bridge inverter circuit is connected to the step-up transformer through the LC resonant circuit, and the step-up transformer is connected to the load through the rectifier circuit; The voltage divider is connected to the load, the voltage divider is connected to the AD sampling circuit through the signal conditioning circuit, the AD sampling circuit is connected to the processing chip, and the processing chip is connected to the full-bridge inverter circuit through the driving circuit.

2. The high-precision high-voltage charging control device according to claim 1, characterized in that: The voltage divider comprises: a first voltage dividing branch, a second voltage dividing branch and a third voltage dividing branch; One end of the first voltage dividing branch is connected to the high voltage input end of the load, the other end of the first voltage dividing branch is connected to one end of the second voltage dividing branch, and the other end of the second voltage dividing branch is connected to the signal conditioning circuit and outputs a positive signal; The first voltage dividing branch includes a plurality of first voltage dividing components connected in series; The second voltage dividing branch includes a plurality of second voltage dividing components connected in series; The third voltage dividing branch includes a plurality of third voltage dividing components connected in series, One end of the third voltage dividing branch is connected to the common connection end of the first voltage dividing branch and the second voltage dividing branch through a fourth voltage dividing component; the other end of the third voltage dividing branch is connected to the signal conditioning circuit and outputs a negative signal; the common connection end of the third voltage dividing branch and the fourth voltage dividing component is grounded; The first voltage dividing component, the second voltage dividing component, the third voltage dividing component and the fourth voltage dividing component respectively include two resistors connected in parallel.

3. The high-precision high-voltage charging control device according to claim 2, characterized in that: The first voltage dividing component is provided with 100 strings; The second voltage dividing component and the third voltage dividing component are respectively provided with 9 strings.

4. The high-precision high-voltage charging control device according to claim 3, characterized in that: The resistance values of the two parallel resistors in the first voltage divider component are 470 kΩ respectively; the resistance values of the two parallel resistors in the second voltage divider component, the third voltage divider component and the fourth voltage divider component are 47 kΩ respectively.

5. The high-precision high-voltage charging control device according to claim 2, characterized in that: The resistors in the first voltage divider component, the second voltage divider component, the third voltage divider component and the fourth voltage divider component all have a temperature drift level of 25 ppm / °C.

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