CN111934406A - Power supply autonomous management adapter circuit and charging control method - Google Patents

Abstract

The invention discloses a power supply self-management adapter circuit and a charging control method, comprising an AC-DC voltage conversion circuit, a DC unregulated conversion circuit, a DC precise voltage regulation circuit, and a communication control circuit. The AC-DC voltage conversion circuit converts the input AC voltage of the power grid into a DC voltage, which is input to the DC unregulated conversion circuit. The output signal of the circuit is used as the input signal of the DC precision voltage regulation circuit, and the DC precision voltage regulation circuit determines a constant voltage output according to the charging equipment; the communication control circuit realizes the communication function and provides the AC-DC voltage conversion circuit, the DC unregulated conversion circuit and the DC voltage. Precise voltage regulator circuit for control. The circuit reduces the loss, eliminates the hidden danger caused by the overheating of the charging chip to the equipment, realizes the real-time control of the power supply of the equipment, and has a very good application prospect.

Description

A kind of power supply self-management adapter circuit and charging control method

technical field

The invention belongs to the technical field of power supply, and more particularly, relates to a power supply self-management adapter circuit and a charging control method.

Background technique

The silicon-based power devices commonly used in traditional portable computer power supplies, after decades of rapid development, their performance has approached its theoretical limit, and gradually cannot meet the current requirements for high efficiency, high power density, and light weight in computer power supplies. , becoming one of the bottlenecks restricting the development of computer power technology in the future. In addition, traditional portable computer chargers generally use a two-stage topology, and a first-stage DC-DC is needed to control lithium battery charging inside the portable computer. In the case of using 3C high-current fast charging, this stage of DC-DC Fever can be severe, causing the laptop to heat up, seriously affecting overall performance.

The current portable computer power management technology is still in a relatively scattered state. Although some functions achieve high-density coupling, it is far from the purpose required by users. Power management requires hardware support. Therefore, it is urgent to develop high-efficiency and high-efficiency devices based on new materials. Reliable hardware circuit.

SUMMARY OF THE INVENTION

In view of the defects of the prior art, the purpose of the present invention is to provide a power supply self-management adapter circuit and a charging control method, aiming to solve the problem that the internal heating of the host and the power supply cannot meet the real-time control of the current portable computer under the condition of 3C high-current fast charging. question.

In order to achieve the above purpose, the present invention provides a digital control-based power supply self-management adapter circuit, which includes four parts: an AC-DC voltage conversion circuit, a DC unregulated conversion circuit, a DC precise voltage regulation circuit, and a communication control circuit. ;The AC-DC voltage conversion circuit converts the input AC voltage of the power grid into a DC voltage, which is input into the DC unregulated conversion circuit, and the DC unregulated conversion circuit realizes the unregulated conversion from DC high voltage to low voltage, and the DC unregulated voltage is converted. The output signal of the conversion circuit is used as the input signal of the DC precision voltage regulation circuit, and the DC precision voltage regulation circuit determines a constant voltage output according to the charging equipment; the communication control circuit realizes the communication function and provides the AC-DC voltage conversion circuit, the DC non-regulated voltage conversion circuit and DC precision voltage regulator circuit for control.

Further, the AC-DC voltage conversion circuit includes an EMI filter module, a rectifier module, a BOOST power factor correction module and an output filter module; the EMI filter module filters out interference signals in the AC voltage through capacitors and inductors, and the rectifier module realizes AC-DC voltage. Transform, convert AC voltage into DC voltage; BOOST power factor correction module boosts the DC voltage output by the rectifier module and corrects the power factor, and then filters through the output filter module to obtain the output.

Further, the DC unregulated conversion circuit includes a switching inverter module, a resonant network module, a planar transformer and a synchronous rectification module; the conduction sequence of the switching tube of the switching inverter module and the synchronous rectification module is controlled by the communication control circuit, and each working cycle is controlled by the communication control circuit. On the basis of the initial set value, the turn-on timing difference is predicted by PID calculation, which is used as the basis for the PWM drive output of the next cycle communication control circuit to realize the non-regulated conversion from DC high voltage to low voltage.

Further, the DC precise voltage regulation circuit is a BUCK-BOOST type circuit with multiple outputs to achieve precise adjustment of the output voltage and current. When the communication control circuit does not change the circuit parameters, the voltage or current output value remains unchanged.

Further, the communication control circuit comprises a DSP controller, an SMBUS bus connected via an I2C communication interface; the DSP controller is connected to the SMBUS bus through the I2C communication interface, and the SMBUS bus is connected to the host; the power supply autonomous management adapter circuit is controlled by the DSP controller, The communication and interaction function with the host is realized through the SMBUS bus; the host completes the measurement, calculation and control functions of the battery-powered parameters, and transmits the circuit setting parameters to the DSP controller through the SMBUS bus.

Another aspect of the present invention provides a charging control method based on the above-mentioned power supply self-management adapter circuit, determining charging parameters according to the state of the charging equipment, and selecting a charging method; when the power of the charging equipment is low, the DSP controller controls the adapter circuit to output a 3C large current , the adapter circuit works in the constant current CC charging mode; when the charging equipment is high in power, the output voltage of the adapter circuit is kept unchanged, and the output current is gradually reduced until the full power is reached, and the adapter circuit works in the constant voltage CV charging mode; state exception handling, limit The adapter circuit current and voltage output or stop charging the charging device; the state of the charging device is read by the host, and the SMBUS bus communicates with the DSP controller through the I2C communication interface and changes the adapter circuit control parameters.

Among them, the self-management of the power supply self-management adapter circuit has multiple working modes and multiple outputs. According to the input AC voltage and the change of the external load of the circuit, it controls the switching between multiple working modes and the working state of the adapter circuit; according to the power of the charging equipment Matching and controlling the DC precision voltage regulator circuit for multiple voltage and current outputs.

Through the above technical solutions conceived by the present invention, compared with the prior art, the following beneficial effects can be achieved:

1. The power supply self-management adapter circuit provided by the present invention adopts a multi-level circuit structure design and has multiple outputs, eliminating the hidden dangers caused by the high current heat dissipation of the traditional adapter circuit to the charging equipment;

2. The charging control method based on the power supply self-management adapter circuit provided by the present invention optimizes the control strategy. The host detects and estimates the battery state and system power consumption, and interacts with the DSP controller through the SMBUS bus to achieve real-time control and prolong battery usage. life;

3. The control circuit of the charging control method based on the power supply self-management adapter circuit provided by the present invention adopts a single microprocessor, with simple structure, high stability and good interactivity;

4. The charging control method based on the power supply self-management adapter circuit provided by the present invention The self-management of the adapter circuit under the control of the DSP, in the case that the host device does not participate in the control, according to the input voltage and load changes, the control circuit operates in a variety of modes. It can switch between and change the working state of the adapter circuit, which can meet more applications.

Description of drawings

1 is a schematic structural diagram of a power supply autonomous management adapter circuit provided by the present invention;

FIG. 2 is a schematic diagram of a charging control method based on a power supply self-management adapter circuit provided by the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The invention provides a power supply self-management adapter circuit. As shown in Figure 1, the power supply self-management adapter circuit includes four parts: AC-DC voltage conversion circuit, DC unregulated conversion circuit, DC precise voltage regulation circuit, and communication control circuit; the AC-DC voltage conversion circuit converts the input grid AC The voltage is converted into DC voltage and input to the DC unregulated conversion circuit. The DC unregulated conversion circuit realizes the unregulated conversion from DC high voltage to low voltage. The output signal of the DC unregulated conversion circuit is used as the input of the DC precision voltage regulation circuit. Signal, the DC precision voltage regulation circuit determines the constant voltage output according to the charging equipment; the communication control circuit realizes the communication function and controls the AC-DC voltage conversion circuit, the DC unregulated conversion circuit and the DC precision voltage regulation circuit. After the circuit works, the working status of each part will be transmitted through the SMBUS bus, the controller and the host device can read the information, and adjust the working mode of the circuit to achieve a better match according to the different working status and work needs.

Specifically, the AC-DC voltage conversion circuit includes an EMI filter module, a rectifier module, a BOOST power factor correction module, and an output filter module; the EMI filter module filters out interference signals in the AC voltage through capacitors and inductors, and the rectifier module realizes AC-DC voltage. Transform, convert AC voltage into DC voltage; BOOST power factor correction module boosts the DC voltage output by the rectifier module and corrects the power factor, and then filters through the output filter module to obtain the output.

Specifically, the DC unregulated conversion circuit includes a switching inverter module, a resonant network module, a planar transformer and a synchronous rectification module; the switching on-time sequence of the switching inverter module and the synchronous rectification module is controlled by the communication control circuit, and each working cycle On the basis of the initial set value, the turn-on timing difference is predicted by PID calculation, which is used as the basis for the PWM drive output of the next cycle communication control circuit to realize the non-regulated conversion from DC high voltage to low voltage.

Specifically, the DC precise voltage regulation circuit is a BUCK-BOOST type circuit with multiple outputs to achieve precise adjustment of the output voltage and current. When the communication control circuit does not change the circuit parameters, the voltage or current output value remains unchanged.

Specifically, the communication control circuit includes a DSP controller and an SMBUS bus connected via an I2C communication interface; the DSP controller is connected to the SMBUS bus through the I2C communication interface, and the SMBUS bus is connected to the host; the power supply autonomous management adapter circuit is controlled by the DSP controller, The communication and interaction function with the host is realized through the SMBUS bus; the host completes the measurement, calculation and control functions of the battery-powered parameters, and transmits the circuit setting parameters to the DSP controller through the SMBUS bus.

The present invention also provides a charging control method based on the above-mentioned power source self-management adapter circuit, which determines charging parameters according to the state of the charging equipment, and selects the charging method; when the power of the charging equipment is low, the DSP controller controls the adapter circuit to output a 3C high current, and the adapter The circuit works in constant current CC charging mode; when the charging equipment is high in power, keep the output voltage of the adapter circuit unchanged, gradually reduce the output current until full power, the adapter circuit works in constant voltage CV charging mode; state abnormal processing, limit the adapter circuit Current and voltage output or stop charging the charging device; the state of the charging device is read by the host, and communicated with the DSP controller by the SMBUS bus through the I2C communication interface and changes the adapter circuit control parameters.

Specifically, when working, the AC voltage is firstly input from the outside, and its effective value can vary within a large range. At this time, all power switches in the circuit are in a disconnected state, and the host device returns to the battery through the SMBUS bus and the system runs at this time. The state, read by the DSP controller, limits power output based on operating conditions or in event processing situations. The sampling circuit samples the output voltage of the AC-DC voltage conversion circuit. When the voltage reaches a certain value, it is confirmed that the capacitor of the output filter module is fully charged, and the DSP controller starts to input the PWM wave to control the on and off of the switch tube, and enter the closed loop At the same time, the PWM wave frequency and duty cycle are adjusted according to the change of the input voltage sampling value and the change of the battery state fed back by the host device through the SMBUS bus communication. The output of the AC-DC voltage conversion circuit is used as the input of the DC unregulated conversion circuit, and the output is an unregulated DC low voltage through the transformer and synchronous rectification, and the output voltage amplitude has a large fluctuation. The voltage and current are precisely regulated and the output is kept constant. At this time, the host devices have all started to work, and the status information of each part is transmitted to the DSP controller through the SMBUS bus and then through the I2C communication interface. The controller changes the working mode and status of the adapter circuit, and determines the charging mode, charging voltage and current. If When the battery is fully charged or the state does not require charging, the output is limited, and the output power supply to the working system is controlled at the same time to reduce losses.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.

Claims (7)

1. A power supply autonomous management adapter circuit is characterized by comprising an alternating current-direct current voltage conversion circuit, a direct current unstable voltage conversion circuit, a direct current accurate voltage regulation circuit and a communication control circuit; the alternating current-direct current voltage conversion circuit converts input power grid alternating current voltage into direct current voltage, the direct current voltage is input into the direct current non-voltage-stabilizing conversion circuit, the direct current non-voltage-stabilizing conversion circuit realizes non-voltage-stabilizing conversion from direct current high voltage to low voltage, an output signal of the direct current non-voltage-stabilizing conversion circuit is used as an input signal of the direct current precision voltage regulation circuit, and the direct current precision voltage regulation circuit determines constant voltage output according to charging equipment; the communication control circuit realizes a communication function and controls the alternating current-direct current voltage conversion circuit, the direct current non-voltage-stabilizing conversion circuit and the direct current precise voltage regulation circuit.

2. The power autonomous management adapter circuit of claim 1, wherein the ac-to-dc voltage conversion circuit comprises an EMI filter module, a rectifier module, a BOOST power factor correction module, and an output filter module; the EMI filtering module filters interference signals in alternating current voltage through a capacitor and an inductor, and the rectifying module realizes alternating current-direct current voltage conversion and converts the alternating current voltage into direct current voltage; the BOOST power factor correction module BOOSTs the direct-current voltage output by the rectification module, corrects the power factor, and then filters the direct-current voltage through the output filtering module to obtain output.

3. The power supply autonomous management adapter circuit according to claim 1, wherein the dc-unregulated conversion circuit includes a switching inverter module, a resonant network module, a planar transformer and a synchronous rectifier module; the switch inversion module and the synchronous rectification module are controlled by the communication control circuit in the switch tube conduction time sequence, and the difference of the conduction time sequence of each working period is predicted by PID calculation on the basis of an initial set value and serves as the PWM driving output basis of the communication control circuit in the next period, so that the non-voltage stabilization conversion from the direct current high voltage to the low voltage is realized.

4. The power supply autonomous management adapter circuit according to claim 1, wherein the dc precision voltage regulator circuit is a BUCK-BOOST type circuit, and has multiple outputs to realize precise regulation of output voltage and current, and when the communication control circuit does not change the circuit parameters, the voltage or current output value is kept unchanged.

5. The power autonomous management adapter circuit of claim 1, wherein the communication control circuit comprises a DSP controller, an SMBUS bus connected via an I2C communication interface; the DSP controller is connected with an SMBUS through an I2C communication interface, and the SMBUS is connected to the host; the power supply autonomous management adapter circuit is controlled by the DSP controller, and a communication interaction function with the host is realized through the SMBUS; the host machine completes the functions of measuring, calculating and controlling the parameters of the battery power supply and transmits the circuit setting parameters to the DSP controller through the SMBUS.

6. A charging control method of the power supply autonomous management adapter circuit according to any one of claims 1 to 5, characterized in that a charging parameter is determined according to the state of a charging device, and a charging mode is selected; when the electric quantity of the charging equipment is low, the DSP controller controls the adapter circuit to output 3C heavy current, and the adapter circuit works in a constant current CC charging mode; when the charging equipment is high in power, the output voltage of the adapter circuit is kept unchanged, the output current is gradually reduced until the adapter circuit is full of power, and the adapter circuit works in a constant-voltage CV charging mode; performing state exception processing, and limiting current and voltage output of the adapter circuit or stopping charging the charging equipment; the state of the charging device is read by the host and communicated by the SMBUS bus through the I2C communication interface to the DSP controller and to change the adapter circuit control parameters.

7. The charge control method according to claim 6, wherein the power supply autonomous management adapter circuit has a plurality of operating modes and a plurality of outputs, and controls switching between the plurality of operating modes and the operating state of the adapter circuit according to the input alternating voltage and the change of the external load of the circuit; and controlling multi-path voltage and current output of the direct current accurate voltage regulating circuit according to the power matching of the charging equipment.

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