Battery charging system with wide input range

Abstract

The utility model belongs to the technical field of voltage conversion, and particularly discloses a wide input range battery charging system, which is characterized in that the input end of an input sampling module, the input end of a direct current step-down module and the input end of a direct current step-up module are all connected with an external input power supply module; the output end of the input sampling module is connected with an analog-to-digital conversion interface of the control module, the output end of the direct-current step-down module and the output end of the direct-current step-up module are both connected with the input end of the battery state feedback module, and the output end of the battery state feedback module is connected with an external lithium battery. A feedback end of the battery state feedback module is connected with a feedback interface of the control module, a first pulse modulation interface of the control module is connected with the direct-current step-down module, and a second pulse modulation interface of the control module is connected with the direct-current step-up module. According to the utility model, by adjusting control parameters, conversion of output voltage of the system can be realized, batteries of various specifications can be charged, and the suitability of the charging system is improved. The charger is suitable for battery charging.

Description

TECHNICAL FIELD

[0001] The utility model belongs to voltage conversion technical field, specifically a wide input range battery charging system. BACKGROUND

[0002] With the rapid development of electronic technology, as the indispensable battery of electronic equipment, its importance is more and more remarkable, and the demand of user for battery is also more and more big. Because of the economy, environmental protection and many advantages of charging battery, it is widely used, therefore also promotes the rapid development of charging device.

[0003] At present, the charging device on the market usually has fixed charging voltage and charging current, that is, the charging parameter is not adjustable, so it is necessary to use the charging device of adaptation to charge the battery, if the external input voltage and the charging voltage of the battery are not matched, the battery may be damaged. Therefore, the existing charging device has poor adaptability, and an adjustable charging parameter charging device is urgently needed to adapt to various specifications of battery. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a wide input range battery charging system, which can realize the conversion of system output voltage by adjusting control parameters, charge various specifications of battery and improve the adaptability of charging system.

[0005] In order to achieve the above-mentioned purpose, the technical method adopted by the utility model is as follows:

[0006] A wide input range battery charging system, comprising input sampling module, control module, DC boost module, DC buck module and battery state feedback module, the input end of input sampling module, the input end of DC buck module and the input end of DC boost module are all connected with the output end of external input power module, the output end of input sampling module is connected with the analog-digital conversion interface of control module, the output end of DC buck module and the output end of DC boost module are all connected with the input end of battery state feedback module, the output end of battery state feedback module is connected with external lithium battery, the feedback end of battery state feedback module is connected with the feedback interface of control module, the first pulse modulation interface of control module is connected with the control end of DC buck module, and the second pulse modulation interface of control module is connected with the control end of DC boost module.

[0007] As a limitation: the DC voltage reducing module includes a first MOS tube, a first inductor, a third resistor, a first diode and a first light emitting diode, the source of the first MOS tube is connected with the output end of the external input power module, the drain of the first MOS tube is connected with one end of the third resistor, the negative electrode of the first diode and one end of the first inductor respectively, the other end of the third resistor is connected with the positive electrode of the first light emitting diode, the negative electrode of the first light emitting diode and the positive electrode of the first diode are grounded, the other end of the first inductor is connected with the output end of the DC voltage increasing module and the input end of the battery state feedback module respectively; the gate of the first MOS tube is connected with the first pulse modulation interface of the control module.

[0008] As a limitation: the DC voltage increasing module includes a second MOS tube, a third MOS tube, a second inductor, a fourth resistor, a second diode and a second light emitting diode, the source of the second MOS tube is connected with the output end of the external input power module, the drain of the second MOS tube is connected with one end of the second inductor and one end of the fourth resistor respectively, the other end of the second inductor is connected with the positive electrode of the second diode and the source of the third MOS tube respectively, the negative electrode of the second diode is connected with the other end of the first inductor, the other end of the fourth resistor is connected with the positive electrode of the second light emitting diode, the negative electrode of the second light emitting diode and the drain of the third MOS tube are grounded; the gate of the second MOS tube is connected with the control interface of the control module, the gate of the third MOS tube is connected with the second pulse modulation interface of the control module.

[0009] As a limitation: the battery state feedback module includes a current sensor, a second capacitor, a fifth resistor and a sixth resistor, the input end of the current sensor is connected with the output end of the DC voltage reducing module and the output end of the DC voltage increasing module respectively, the feedback end of the current sensor is connected with the current feedback interface of the control module, the output end of the current sensor is connected with the external lithium battery and one end of the fifth resistor respectively, the other end of the fifth resistor is connected with one end of the sixth resistor, one end of the second capacitor and the voltage feedback interface of the control module respectively, the other end of the sixth resistor and the other end of the second capacitor are grounded.

[0010] As a limitation: the input sampling module includes a first resistor, a second resistor, a first capacitor and an operational amplifier, one end of the first resistor is connected with the output end of the external input power module, the other end of the first resistor is connected with one end of the second resistor, one end of the first capacitor and the positive phase input end of the operational amplifier respectively, the other end of the second resistor and the other end of the first capacitor are grounded, the negative phase input end and the output end of the operational amplifier are connected with the analog-digital conversion interface of the control module.

[0011] As a limitation, it also includes a first filter capacitor and a second filter capacitor. The positive terminal of the first filter capacitor is connected to the input terminal of the DC-DC buck module and the input terminal of the DC-DC boost module, respectively, and the negative terminal of the first filter capacitor is grounded. The positive terminal of the second filter capacitor is connected to the output terminal of the DC-DC buck module and the output terminal of the DC-DC boost module, respectively, and the negative terminal of the second filter capacitor is grounded.

[0012] The beneficial effects achieved by this utility model, due to the adoption of the above-mentioned solution, compared with the prior art, are as follows:

[0013] This utility model provides a wide input range battery charging system, including an input sampling module, a control module, a DC boost module, a DC buck module, and a battery status feedback module. The input sampling module collects input information and transmits it to the control module. The DC boost and DC buck modules are connected in parallel to the control module, which controls the conversion of electrical energy by the DC boost and DC buck modules, inputting the converted electrical energy to the lithium battery. The battery status feedback module receives various battery statuses. For batteries requiring different charging voltages, only the control parameters of the internal control module need to be adjusted to achieve the conversion of the system's output voltage, enabling charging of various battery specifications and improving the adaptability of the charging system. By setting filter capacitors, noise, interference signals, and other disturbances in the circuit are filtered out, making the circuit output more stable and reducing interference from the external environment.

[0014] This invention is applicable to battery charging. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a structural block diagram of a wide input range battery charging system according to an embodiment of the present invention;

[0017] Figure 2 This is a circuit diagram of a wide input range battery charging system according to an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. However, those skilled in the art should understand that the present invention is not limited to the following embodiments. Any improvements and equivalent changes made based on the specific embodiments of the present invention are within the scope of protection of the claims of the present invention.

[0019] Example: A wide input range battery charging system

[0020] A wide input range battery charging system, such as Figure 1As shown, the wide input range battery charging system comprises an input sampling module, a control module, a DC boost module, a DC buck module and a battery state feedback module, the input end of the input sampling module, the input end of the DC buck module and the input end of the DC boost module are connected with the output end of the external input power module, the output end of the input sampling module is connected with the analog-digital conversion interface of the control module, the output end of the DC buck module and the output end of the DC boost module are connected with the input end of the battery state feedback module, the output end of the battery state feedback module is connected with the external lithium battery, the feedback end of the battery state feedback module is connected with the feedback interface of the control module, the first pulse modulation interface of the control module is connected with the control end of the DC buck module, and the second pulse modulation interface of the control module is connected with the control end of the DC boost module.

[0021] The circuit principle of the wide input range battery charging system of the embodiment is as shown in the figure Figure 2As shown, the control module is a conventional control chip, which includes a PWM1 interface, a PWM2 interface, an ADC interface, an I / O interface, an FB-A interface, an FB-V interface and a GND interface, i.e., the first pulse modulation interface of the control module is the PWM1 interface, the second pulse modulation interface is the PWM2 interface, the analog-digital conversion interface is the ADC interface, the control interface is the I / O interface, the current feedback interface is the FB-A interface, and the voltage feedback interface is the FB-V interface; the input sampling module includes a first resistor R1, a second resistor R2, a first capacitor C1 and an operational amplifier OP; the direct-current voltage reduction module includes a first MOS transistor MOS1, a first inductor L1, a third resistor R3, a first diode D1 and a first light-emitting diode LDE1; the direct-current voltage increase module includes a second MOS transistor MOS2, a third MOS transistor MOS3, a second inductor L2, a fourth resistor R4, a second diode D2 and a second light-emitting diode LDE2; the battery state feedback module includes a current sensor, a second capacitor C2, a fifth resistor R5 and a sixth resistor R6; and the system further includes a first filter capacitor E1 and a second filter capacitor E2.The external input power module includes a conventional rectifier transformer circuit, the AC power supply in the external input power module outputs DC power supply through the rectifier transformer circuit, the output end of the external input power module is connected with one end of the first resistor R1, the positive electrode of the first filter capacitor E1, the source electrode of the first MOS tube MOS1 and the source electrode of the second MOS tube MOS2 respectively, the other end of the first resistor R1 is connected with the positive phase input end of the operational amplifier OP, one end of the second resistor R2 and one end of the first capacitor C1 respectively, the other end of the second resistor R2, the other end of the second capacitor C2 and the negative electrode of the first filter capacitor E1 are grounded, and the inverting input end and the output end of the operational amplifier OP are connected with the ADC interface of the control chip; the drain electrode of the first MOS tube MOS1 is connected with one end of the third resistor R3, the negative electrode of the first diode D1 and one end of the first inductor L1 respectively, the other end of the third resistor R3 is connected with the positive electrode of the first light emitting diode LDE1, the negative electrode of the first light emitting diode LDE1 and the positive electrode of the first diode D1 are grounded, and the other end of the first inductor L1 is connected with the negative electrode of the second diode D2, the positive electrode of the second filter capacitor E2 and the input end of the current sensor respectively; the drain electrode of the second MOS tube MOS2 is connected with one end of the second inductor L2 and one end of the fourth resistor R4 respectively, the other end of the second inductor L2 is connected with the positive electrode of the second diode D2 and the source electrode of the third MOS tube MOS3 respectively, the other end of the fourth resistor R4 is connected with the positive electrode of the second light emitting diode LDE2, the negative electrode of the second light emitting diode LDE2, the drain electrode of the third MOS tube MOS3 and the negative electrode of the second filter capacitor E2 are grounded; the gate electrode of the first MOS tube MOS1 is connected with the PWM1 interface of the control chip, the gate electrode of the second MOS tube MOS2 is connected with the I / O interface of the control chip, and the gate electrode of the third MOS tube MOS3 is connected with the PWM2 interface of the control chip; the feedback end of the current sensor is connected with the FB-A interface of the control chip, the output end of the current sensor is connected with the external lithium battery and one end of the fifth resistor R5 respectively, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6, one end of the second capacitor C2 and the FB-V interface of the control chip respectively, the other end of the sixth resistor R6 and the other end of the second capacitor C2 are grounded, and the GND interface of the control chip is grounded.

[0022] The wide input range battery charging system of the embodiment works according to the charging voltage of the lithium battery to determine the opening condition of the second MOS tube MOS2, the PWM duty cycle of the first MOS tube MOS1 and the PWM duty cycle of the third MOS tube MOS3. When the input voltage VIN is lower than the charging voltage of the lithium battery, the second MOS tube MOS2 is in the conducting state, the DC boost module is started, the first MOS tube MOS1 is in the cut-off state, and the third MOS tube MOS3 is opened PWM control. At this time, the first light emitting diode LDE1 and the second light emitting diode LDE2 are lit, indicating that the DC boost module is started. The lower the input voltage VIN, the longer the conduction time of the third MOS tube MOS3, so that the output voltage VOUT reaches the specified voltage. When the input voltage VIN is higher than the charging voltage of the lithium battery, the second MOS tube MOS2 and the third MOS tube MOS3 are in the cut-off state, and the first MOS tube MOS1 is opened PWM control. At this time, only the first light emitting diode LDE1 is lit, indicating that the DC boost module is started. The higher the input voltage VIN, the shorter the conduction time of the first MOS tube MOS1, so that the output voltage VOUT reaches the specified voltage. In both states, the voltage fed back through the FB-V interface is used to adjust the PWM duty cycle in real time, so that the output voltage VOUT is more accurate. The current fed back through the FB-A interface is used to calculate the output current through the current sensor parameters, and the PWM duty cycle is adjusted in real time to control the output current.

Claims

1. A wide input range battery charging system, characterized by, The application relates to a battery management system, which comprises an input sampling module, a control module, a direct current (DC) boosting module, a DC reducing module and a battery state feedback module, the input end of the input sampling module, the input end of the DC reducing module and the input end of the DC boosting module are connected with the output end of an external input power module, the output end of the input sampling module is connected with the analog-digital conversion interface of the control module, the output end of the DC reducing module and the output end of the DC boosting module are connected with the input end of the battery state feedback module, the output end of the battery state feedback module is connected with an external lithium battery, the feedback end of the battery state feedback module is connected with the feedback interface of the control module, the first pulse modulation interface of the control module is connected with the control end of the DC reducing module, and the second pulse modulation interface of the control module is connected with the control end of the DC boosting module.

2. A wide input range battery charging system according to claim 1, wherein, The DC reducing module comprises a first MOS tube, a first inductor, a third resistor, a first diode and a first light-emitting diode, the source of the first MOS tube is connected with the output end of the external input power module, the drain of the first MOS tube is connected with one end of the third resistor, the negative electrode of the first diode and one end of the first inductor, the other end of the third resistor is connected with the positive electrode of the first light-emitting diode, the negative electrode of the first light-emitting diode and the positive electrode of the first diode are grounded, and the other end of the first inductor is connected with the output end of the DC boosting module and the input end of the battery state feedback module; the gate of the first MOS tube is connected with the first pulse modulation interface of the control module.

3. A wide input range battery charging system as claimed in claim 1 or 2, wherein, The DC boosting module comprises a second MOS tube, a third MOS tube, a second inductor, a fourth resistor, a second diode and a second light-emitting diode, the source of the second MOS tube is connected with the output end of the external input power module, the drain of the second MOS tube is connected with one end of the second inductor and one end of the fourth resistor, the other end of the second inductor is connected with the positive electrode of the second diode and the source of the third MOS tube, the negative electrode of the second diode is connected with the other end of the first inductor, the other end of the fourth resistor is connected with the positive electrode of the second light-emitting diode, the negative electrode of the second light-emitting diode and the drain of the third MOS tube are grounded; the gate of the second MOS tube is connected with the control interface of the control module, and the gate of the third MOS tube is connected with the second pulse modulation interface of the control module.

4. A wide input range battery charging system as claimed in claim 1 or 2, wherein, The battery state feedback module comprises a current sensor, a second capacitor, a fifth resistor and a sixth resistor, the input end of the current sensor is connected with the output end of the DC reducing module and the output end of the DC boosting module, the feedback end of the current sensor is connected with the current feedback interface of the control module, the output end of the current sensor is connected with the external lithium battery and one end of the fifth resistor, the other end of the fifth resistor is connected with one end of the sixth resistor, one end of the second capacitor and the voltage feedback interface of the control module, the other end of the sixth resistor and the other end of the second capacitor are grounded.

5. A wide input range battery charging system as claimed in claim 1 or 2, wherein, The input sampling module comprises a first resistor, a second resistor, a first capacitor and an operational amplifier, one end of the first resistor is connected with an output end of an external input power module, the other end of the first resistor is connected with one end of the second resistor, one end of the first capacitor and a positive input end of the operational amplifier respectively, the other end of the second resistor and the other end of the first capacitor are grounded, and the inverting input end and the output end of the operational amplifier are connected with an analog-digital conversion interface of the control module.

6. A wide input range battery charging system as claimed in claim 1 or 2, wherein, It also comprises a first filter capacitor and a second filter capacitor, the positive pole of the first filter capacitor is connected with the input end of the DC voltage reduction module and the input end of the DC voltage increase module respectively, and the negative pole of the first filter capacitor is grounded; the positive pole of the second filter capacitor is connected with the output end of the DC voltage reduction module and the output end of the DC voltage increase module respectively, and the negative pole of the second filter capacitor is grounded.

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