CN218603199U

CN218603199U - Wide voltage charging conversion circuit and system

Info

Publication number: CN218603199U
Application number: CN202222336122.0U
Authority: CN
Inventors: 程彬彬; 杨永开; 冉启舸; 程平珍
Original assignee: Chongqing Dajiang Power Equipment Manufacturing Co ltd
Current assignee: Chongqing Dajiang Power Equipment Manufacturing Co ltd
Priority date: 2022-09-02
Filing date: 2022-09-02
Publication date: 2023-03-10
Anticipated expiration: 2032-09-02

Abstract

The utility model provides a wide voltage charge conversion circuit and system. The device comprises a BOOST circuit, a PWM control chip circuit, a voltage regulating circuit and a battery detection circuit; the electric signal output by the charging power supply is input into a battery charging end after being processed by a BOOST circuit; the PWM output end of the PWM control chip circuit is connected with the on-off control end of the MOS switch tube of the BOOST circuit, the current monitoring end of the PWM control chip circuit is connected with the output end of the voltage regulating circuit, and the input end of the voltage regulating circuit is connected with the regulating signal output end of the controller; the battery detection circuit is connected with the controller. The duty ratio and the maximum current limit value of a PWM signal output by the PWM control chip are controllable and adjustable according to the voltage accessed by the current monitoring end, the maximum current limit value of the PWM control chip is dynamically set along with the charging power, the charging is carried out with the allowable maximum charging power in a wide voltage range in a self-adaptive manner, and the charging efficiency is improved.

Description

Wide-voltage charging conversion circuit and system

Technical Field

The utility model relates to a technical field that charges especially relates to a wide voltage conversion circuit and system that charges.

Background

The DC charging scenes of energy storage power supplies (such as batteries) are becoming more and more abundant, the charging using vehicles, solar chargers and various adapters have become basic requirements, the rated power and rated output voltage of chargers/adapters in different scenes and with different output power are different, and how to keep the batteries stable and safe in a wide voltage range (such as under different chargers/adapters) and high charging efficiency is a technical problem which needs to be solved urgently at present.

In the prior art, in order to protect the battery, a charging conversion circuit is arranged between the charger/adapter and the battery to limit the output voltage and the output current of the charger/adapter within the allowable range of the battery.

As shown in fig. 1, an input terminal VIN of a conventional charging conversion circuit is connected to an output terminal of a charger/adapter, and an output terminal VOUT of the charging conversion circuit is connected to a charging terminal of a battery; the charging conversion circuit comprises a BOOST circuit and a PWM control chip circuit, wherein the BOOST circuit comprises an inductor L0, an MOS switch Q0, a diode D0 and a capacitor C0; the PWM control chip outputs a PWM signal to control the on-off of the MOS switch Q0. PWM control chip circuits typically include a current control loop, or a current control loop and a voltage control loop; the voltage control loop is used for detecting the output voltage VOUT of the BOOST and performing overvoltage protection; the current control ring detects the current of the MOS switch Q0 which flows through the current detection resistor Rsense connected to the current monitoring end, and compares the current with the set current limiting value, concretely, the sampling voltage of the current detection resistor Rsense is compared with the set voltage inside the chip (the set voltage corresponds to the current limiting value), the duty ratio of the PWM signal is reduced when the internal set voltage is reached, and then the charging current is reduced, the current limiting protection is realized, if the internal set voltage is not reached, the duty ratio of the PWM signal can be adjusted according to the inverse correlation of the sampling voltage of the current detection resistor Rsense. However, as shown in fig. 1, the current detection resistor Rsense is usually a fixed resistance value, after the current detection resistor Rsense is set, the current limiting value of the current control loop is fixed, and if the current limiting value is set to be smaller, the high-power charger/adapter cannot output full current, and cannot charge full current with low charging efficiency; if the current limiting value is set to be larger, for a low-power charger, the input voltage can be pulled down, the output power of the charger/adapter can be reduced, and potential safety hazards exist. Therefore, when the current detection resistor Rsense is a fixed resistance value, the current detection resistor Rsense cannot perform well on different chargers/adapters, so that the battery cannot be charged stably, safely and efficiently within a wide voltage range.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving the technical problem who exists among the prior art at least, provide a wide voltage charge conversion circuit and system.

In order to achieve the above object of the present invention, according to a first aspect of the present invention, the present invention provides a wide voltage charging converting circuit, which comprises a BOOST circuit, a PWM control chip circuit having a current control loop, a voltage regulating circuit, and a battery detection circuit for detecting charging power; the electric signal output by the charging power supply is input into a battery charging end after being processed by a BOOST circuit;

the PWM output end of the PWM control chip circuit is connected with the on-off control end of the MOS switch tube of the BOOST circuit, the current monitoring end of the PWM control chip circuit is connected with the output end of the voltage regulating circuit, and the input end of the voltage regulating circuit is connected with the regulating signal output end of the controller; the battery detection circuit is connected with the controller.

In order to realize the above object of the utility model, according to the utility model discloses a second aspect, the utility model provides a wide voltage charge conversion system, including the controller with the first aspect wide voltage charge conversion circuit, the controller respectively with voltage regulation circuit, battery detection circuit, charging switch unit, charging source input detection circuit and battery temperature detection circuit connection among the wide voltage charge conversion circuit.

In order to realize the above object of the utility model, according to the utility model discloses a third aspect, the utility model provides an equipment, include the utility model discloses the second aspect wide voltage charge conversion system and battery, the charge end of battery with the output of BOOST circuit is connected in the wide voltage charge conversion system.

The technical scheme is as follows: the utility model provides a wide voltage charge converting circuit, system and equipment, the current monitoring end of PWM control chip no longer connects the current detection resistance of fixed resistance, has realized through voltage regulation circuit that the current monitoring end voltage of PWM control chip is controllable adjustable to the PWM signal duty cycle of PWM control chip output is based on current monitoring end voltage is controllable adjustable, and then the maximum current limiting value of PWM control chip is controllable adjustable according to current monitoring end voltage; the real-time charging power can be acquired through the battery detection circuit, the output voltage of the voltage regulation circuit is convenient to regulate based on the real-time charging power, the duty ratio of a PWM signal output by the PWM control chip is further regulated, the maximum current limiting value of the PWM control chip is dynamically set along with the charging power, and therefore the battery charging device can be adaptively used for adapters/chargers of different types (such as different rated output powers) to charge with the allowed maximum charging power, and the safe and reliable charging of the battery with high efficiency and high stability in a wide voltage range is realized.

Drawings

Fig. 1 is a schematic diagram of a charging conversion circuit in the prior art;

fig. 2 is a schematic diagram of a preferred structure of a wide voltage charging conversion circuit in embodiment 1 of the present invention;

fig. 3 is a schematic diagram of another preferred structure of the wide voltage charging conversion circuit in embodiment 1 of the present invention;

fig. 4 is a schematic circuit diagram of a specific implementation of the wide voltage charging conversion circuit in embodiment 1 of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected" and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and those skilled in the art may understand the specific meanings of the above terms according to specific situations.

Example 1

In a preferred embodiment, as shown in fig. 2, the wide voltage charging converting circuit includes a BOOST circuit, a PWM control chip circuit having a current control loop, a voltage regulating circuit, and a battery detection circuit for detecting charging power; the electric signal output by the charging power supply is input into a battery charging end after being processed by a BOOST circuit; the PWM output end of the PWM control chip circuit is connected with the on-off control end of the MOS switching tube of the BOOST circuit, the current monitoring end of the PWM control chip circuit is connected with the output end of the voltage regulating circuit, and the input end of the voltage regulating circuit is connected with the regulating signal output end of the controller; the battery detection circuit is connected with the controller.

In the present embodiment, the PWM control chip with the current control loop is preferably, but not limited to, UC2843A or BQ24165.

In this embodiment, a schematic circuit diagram of the connection circuit between the PWM control chip U1 and the charging power connection terminals CON1 and BOOST circuit is shown in fig. 4. In fig. 4, the seventh inductor L7, the first diode D1, the twenty-ninth MOS switch Q29, and the one hundred forty-five capacitor C145 constitute a BOOST circuit. The output end of the charging power supply is connected with the second end of the seventh inductor L7 and the power supply end of the PWM control chip U1 respectively, and in order to prevent current from flowing backwards and limit current, an eleventh diode D11 and a current-limiting resistor R142 are connected between the output end of the charging power supply and the power supply end of the PWM control chip U1 in series. The OUTPUT pin of the PWM control chip U1 OUTPUTs a PWM signal to the gate of the twenty-ninth MOS switch Q29 of the BOOST circuit. The current monitoring end of the PWM control chip U1 is an ISENSE pin, and the difference between the ISENSE pin and the existing circuit shown in the figure 1 is that the current monitoring end of the PWM control chip U1 is disconnected with an MOS switch tube Q29 and is independently connected with a voltage regulating circuit, so that the purpose of regulating the duty ratio of a PWM signal output by the PWM control chip according to the output voltage of the voltage regulating circuit is realized, the on-off frequency of the MOS switch tube Q29 is controlled, and the control of the magnitude of the charging current is further realized.

In the embodiment, as shown in fig. 4, an overcurrent protection fuse F5 is further connected in series between the output terminal of the charging power supply and the seventh inductor L7 of the BOOST circuit, and a plurality of parallel filter capacitors, i.e., a one hundred forty-eight capacitor C148, a one hundred forty-seven capacitor C147, and a one hundred forty-one capacitor C141, are further provided for filtering the power supply signal.

In this embodiment, the voltage regulating circuit is preferably but not limited to a connecting wire or a low-pass filtering unit, when the voltage regulating circuit is a connecting wire or a low-pass filtering unit, the input end of the connecting wire or the low-pass filtering unit is connected to the output pin of the D/a module of the controller, and the output end of the connecting wire or the low-pass filtering unit is connected to the ISENSE pin of the PWM control chip U1.

In this embodiment, in order to achieve effective isolation from the controller and reduce the interference immunity of the output signal of the controller, it is further preferable that the voltage regulating circuit includes a voltage following unit and a low-pass filtering unit that are connected in sequence, an input end of the voltage following unit is connected to the regulating signal output end of the controller, and an output end of the low-pass filtering unit is connected to the current monitoring end of the PWM control chip circuit. The low-pass filter unit is preferably but not limited to an RC low-pass filter circuit cascaded in a single stage or more than two stages, as shown in fig. 4. As shown in fig. 4, the voltage following unit U2 is an operational amplifier negative feedback circuit, which has an isolation function and can improve the driving capability of the adjustment signal, thereby implementing impedance matching between the PWM control chip and the controller. The adjusting signal output end of the controller outputs a PWM signal, and the voltage adjusting circuit can output direct-current voltages with different sizes by adjusting the duty ratio of the PWM signal.

In the present embodiment, it is preferable that the battery detection circuit includes a battery current detection unit that detects a battery charging current and a battery voltage detection unit that detects a battery charging voltage; the output end of the battery current detection unit is connected with the battery current input end of the controller, the output end of the battery voltage detection unit is connected with the battery voltage input end of the controller, and preferably, the controller obtains the real-time charging power by calculating the product of the battery voltage and the battery current.

In the present embodiment, as shown in fig. 4, the battery current detection unit is preferably, but not limited to, a hall current detection chip and its peripheral circuit, and the hall chip is connected in series in the battery charging path. The battery voltage detection unit is preferably, but not limited to, a series resistor voltage division network, as shown in fig. 4, the series resistor voltage division network is formed by connecting a first resistor R1 and a third resistor R3 in series, and a connection point between the first resistor R1 and the third resistor R3 is connected as an output end of the battery voltage detection unit to a battery current input end of the controller.

In a preferred implementation manner of this embodiment, as shown in fig. 4, a drain of an MOS switch tube of the BOOST circuit is connected to a first end of an inductor of the BOOST circuit, a gate of the MOS switch tube is connected to a PWM output end of the PWM control chip circuit, and a source of the MOS switch tube is connected to a common end; in order to absorb spike interference of the MOS switch tube during switching-on and switching-off, the drain electrode of the MOS switch tube is further connected with the first end of the RC series circuit, and/or in order to absorb voltage spike at the inductor L7 caused by switching-off of the MOS switch tube, the first end of the RC series circuit is further connected with the first end of the inductor L7 of the BOOST circuit, and the second end of the RC series circuit is connected with the public end to protect the battery.

In this embodiment, as shown in fig. 4, a series branch formed by connecting a one hundred forty three resistance R143 and a one hundred fifty three capacitance C153 in series is connected in parallel to the drain and the source of the MOS switch Q29. A series branch of a one hundred thirty-seven resistor R137 and a one hundred forty-nine capacitor C149 in series is connected at a first end of an inductance L7 of the BOOST circuit.

In a preferred embodiment of this embodiment, as shown in fig. 3, a charging switch unit is connected in series to a connection path between the output terminal of the BOOST circuit and the charging terminal of the battery, and an on-off control terminal of the charging switch unit is connected to the charging control terminal of the controller. The charging switch unit is preferably, but not limited to, a PMOS switch tube or a relay.

In this embodiment, to realize safe on-off of a large charging current, it is preferable that the charging switch unit has a circuit structure as shown in fig. 4, and includes a relay JK2 and a relay JK2 coil driving control circuit, and a switch contact of the relay JK2 is connected in series to a connection path between an output terminal of the BOOST circuit and a charging terminal of the battery.

In this embodiment, as shown in fig. 4, the relay JK2 coil driving control circuit includes a first thirty-fifth resistor R135, a regulator Z3, a transistor Q26, a first hundred forty capacitor C140, a first hundred thirty-eight capacitor C138, a first hundred thirty-seven capacitor C137, a twelfth diode D10, a transistor Q27, a first hundred thirty-four resistor R134, a first hundred thirty-six resistor R136, and a +12V power supply, wherein the +12V power supply is connected to a first end of the first thirty-fifth resistor R135 and a collector of the transistor Q26, a second end of the first thirty-five resistor R135 is connected to a first end of the regulator Z3, a first end of the first hundred forty capacitor C140, and a base of the transistor Q26, a second end of the regulator Z3 and a second end of the first hundred forty capacitor C140 are connected to a common terminal, an emitter of the transistor Q26 is connected to a first end of the thirty-eight capacitor C138, a first end of the thirty-seven capacitor C137, a cathode of the twelfth diode D10, a third end of the JK2 coil, and a thirty-eighth capacitor C138 are connected to the common terminal of the relay; an emitting electrode of the triode Q27 is connected with the common terminal and a first end of the thirty-fourth resistor R134 respectively, a base electrode of the triode Q27 is connected with a second end of the thirty-fourth resistor R134 and a first end of the thirty-sixth resistor R136 respectively, a second end of the thirty-sixteenth resistor R136 is connected with a charging control terminal of the controller, and a collector electrode of the triode Q27 is connected with an anode of the twelfth diode D10 and a second end of the coil of the relay JK2 respectively. The twelfth pole tube D10 is used to provide a return loop for the coil, improving safety. The triode driving circuit driving coil is adopted, so that stronger current can be provided, and the stable and reliable work of the coil is ensured. When the charging control end of the controller outputs a high level, the triode Q27 is conducted, the coil power supply loop is electrified, the coil attracting relay switch contact is closed, charging is started, when the charging control end of the controller outputs a low level, the triode Q27 is cut off, the coil power supply loop is powered off, the coil cannot attract the relay switch contact to be closed, the relay switch contact is disconnected, and charging is stopped.

In the present embodiment, preferably, in order to eliminate the surge during the closing and opening of the switch of the relay JK2, as shown in fig. 4, a resistor-capacitor series branch is connected in parallel to both ends of the switch contact of the relay JK2, and a one hundred forty-six capacitor C146 and a one hundred thirty-nine resistor R139 are connected in series to the resistor-capacitor series branch.

In a preferred implementation manner of this embodiment, as shown in fig. 3, the controller further includes a charging power input detection circuit, the charging power input detection circuit is configured to detect whether the charging power is connected to and/or an input voltage of the charging power, and an output terminal of the charging power input detection circuit is connected to an input detection terminal of the controller. The charging power source is preferably but not limited to a vehicle charger, a solar charger or various adapters.

In this embodiment, the charging power supply input detection circuit preferably includes an input voltage detection circuit capable of detecting an output voltage of the charging power supply and an input determination circuit capable of determining whether the charging power supply is connected.

In the present embodiment, the input voltage detection circuit is preferably, but not limited to, a resistor divider detection network, and specifically, as shown in fig. 4, the input voltage detection circuit includes a one hundred thirty eight resistor R138, a one hundred forty resistor R140, and a one hundred fifty capacitor C150, a first end of the one hundred thirty eight resistor R138 is connected to the output terminal of the charger, a second end of the one hundred thirty eight resistor R138 is connected to a first end of the one hundred forty resistor R140 and a first end of the one hundred fifty capacitor C150, respectively, and a second end of the one hundred forty resistor R140 and a second end of the one hundred fifty capacitor C150 are both connected to a common terminal. The first end of the hundred forty-first resistor R140 and the first end of the hundred fifty-first capacitor C150 are used as output ends of the input voltage detection circuit and are connected with the first input detection end of the controller. The output voltage of the charging power supply is divided through the one hundred thirty-eight resistors R138 and the one hundred forty resistors R140, the divided voltage signal is filtered through the one hundred fifty capacitors C150 and then can be input into an A/D acquisition end of the controller, the controller judges whether the charging power supply is inserted according to the acquired voltage, and the controller can judge whether the voltage of the charging power supply is abnormal according to the acquired voltage.

In the present embodiment, the input determination circuit preferably, but not limited to, employs an optical coupling isolation detection unit to perform isolation detection, thereby improving reliability. Specifically, as shown in fig. 4, the optical coupling isolation detection unit includes a one hundred thirty-second resistor R132, an optical coupler U20, a one hundred thirty-first resistor R131, and a one hundred thirty-third resistor R133, an output terminal of the charger is connected to a first end of the one hundred thirty-second resistor R132, a second end of the one hundred thirty-twelve resistor R132 is connected to an input terminal of the optical coupler U20, an output terminal of the optical coupler U20 is connected to a first end of the one hundred thirty-third resistor R133, and a second end of the one hundred thirty-third resistor R133 is connected to a second input detection terminal of the controller. A first end of the first one hundred thirty one resistor R131 is connected with the 3.3V power supply, and a second end of the first one hundred thirty one resistor R131 is connected with the pull-up end of the opto-coupler device U20. When charging source inserts the back, the opto-coupler device U20 input high level makes emitting diode light, and the phototriode of opto-coupler device U20 switches on, and opto-coupler device U20 output high level to the second input detection end of controller, when charging source did not insert, the phototriode of opto-coupler device U20 response was not to light and is ended, and opto-coupler device U20 output low level to the second input detection end of controller.

In a preferred implementation manner of this embodiment, as shown in fig. 3, a battery temperature detection circuit is further included, and an output end of the battery temperature detection circuit is connected to a battery temperature input end of the controller. Specifically, as shown in fig. 4, pin 2 of the connection terminal CON2 represents an NTC pin of the battery, the battery temperature detection circuit includes an eleventh resistor R11, a twelfth resistor R12, and a third capacitor C3, a first end of the eleventh resistor R11 and a first end of the twelfth resistor R12 are connected to the NTC pin, a second end of the eleventh resistor R11 is connected to 3.3V, a second end of the twelfth resistor R12 is connected to a battery temperature input terminal of the controller, the battery temperature input terminal of the controller is preferably an a/D pin, the battery temperature detection circuit outputs different analog voltages to the a/D pin according to a battery temperature variation, and the controller obtains the battery temperature according to a corresponding relationship table between the analog voltages and the battery temperature.

In this embodiment, preferably, the PWM control chip may further include a voltage control loop, as shown in fig. 4, a voltage feedback circuit is connected to the output terminal of the BOOST circuit, the voltage feedback circuit includes a second resistor R2 and a fourth resistor R4 connected in series, a first end of the second resistor R2 is connected to the output terminal of the BOOST circuit, a second end of the second resistor R2 is connected to a first end of the fourth resistor R4, a second end of the fourth resistor R4 is connected to the common terminal, and a second end of the second resistor R2 is further connected to the voltage feedback pin VFB of the PWM control chip, so as to monitor the BOOST output voltage in real time, and when the voltage exceeds an allowable range, such as a high-voltage overvoltage or a low-voltage overvoltage, a protection mechanism is started to make the MOS switch Q29 in a closed state, and stop charging the battery.

In this embodiment, in an application scenario, the mobile terminal further includes a printed circuit board, the printed circuit board is provided with the wide voltage charging converting circuit, and is further provided with a controller connection port, a charging power supply connection port, and a battery connection port, where the controller connection port includes a first terminal that needs to be connected to a battery temperature input terminal of the controller, a second terminal that is connected to a first input detection terminal of the controller, a third terminal that is connected to a second input detection terminal of the controller, a fourth terminal that is connected to an adjustment signal output terminal of the controller, a fifth terminal that is connected to a battery voltage input terminal of the controller, and a sixth terminal that is connected to a battery current input terminal of the controller.

Example 2

The present embodiment discloses a wide voltage charging conversion system, which includes the wide voltage charging conversion circuit and the controller provided in embodiment 1, and the controller is connected to the voltage regulation circuit, the battery detection circuit, the charging switch unit, the charging power input detection circuit, and the battery temperature detection circuit in the wide voltage charging conversion circuit, respectively. The controller is preferably but not limited to a single chip microcomputer, an ARM and other microprocessors.

In one application scenario of the present embodiment,

control of charging through wide voltage charge conversion system, concrete control process includes:

step S1, judging whether a charging power supply is accessed or not through an output signal of a charging power supply input detection circuit, if so, entering step S2, otherwise, continuing to execute the step S1; specifically, the charging power input detection may be performed by at least one of the input voltage detection circuit and the input judgment circuit in fig. 4, and if the input voltage detection circuit outputs a high level and/or the input judgment circuit outputs a high level, the charging power is considered to be input. If the input voltage detection circuit outputs a low level or the input judgment circuit outputs a low level, the charging power supply is considered to be not input.

And S2, controlling a voltage regulating circuit to increase the current monitoring terminal voltage of the PWM control chip circuit until the duty ratio of a PWM signal output by the PWM output end of the PWM control chip circuit is lower than or equal to a first duty ratio threshold value, wherein the first duty ratio threshold value is less than or equal to 10%, and starting charging. The output voltage of the voltage regulating circuit is inversely related to the duty ratio of the PWM signal output by the PWM output end of the PWM control chip circuit. When the output voltage of the voltage regulating circuit reaches the voltage threshold set inside the PWM control chip, the duty cycle of the PWM signal output by the PWM output terminal is 0, and when the PWM control chip is UC2843A, the voltage threshold is 1V, so when the output voltage of the voltage regulating circuit is greater than or equal to 1V, the duty cycle of the PWM signal output by the PWM output terminal is 0. The duty ratio of the PWM signal output by the PWM output end of the PWM control chip circuit is firstly adjusted to be low, so that the condition that any charger/adapter starts from low charging current is ensured, the maximum charging power is favorably found along with the increase of the charging current, and the method is safe and reliable. Preferably, when the duty ratio of the PWM signal is lower than or equal to the first duty ratio threshold, the charging switch unit is controlled to be turned on, for example, the switch contact of the relay JK2 is controlled to be closed.

And S3, controlling the voltage regulating circuit to continuously reduce the current monitoring terminal voltage of the PWM control chip circuit, namely, reducing the output voltage of the voltage regulating circuit, so that the duty ratio of a PWM signal output by the PWM output end of the PWM control chip circuit is gradually increased, acquiring real-time charging power through the battery detection circuit, synchronously monitoring whether an abnormal event occurs, if the abnormal event occurs, executing a step S4, if the abnormal event does not occur, executing a step S5, wherein the abnormal event comprises repeated charging starting and disconnecting and/or abnormal battery temperature, preferably, in order to improve charging safety, at least one of repeated charging starting and disconnecting and abnormal battery temperature occurs, and considering that the abnormal event occurs. The repeated on/off of charging is generally characterized in that the current charging current exceeds the rated output power of the charging power supply, the output voltage of the charging power supply is pulled down, the voltage protection ring of the PWM control chip is started to cut off charging, after the charging is cut off, the voltage of the charger/adapter rises back to remove the voltage ring protection, and the repeated on/off of charging is repeatedly expressed. The battery temperature abnormality is generally caused by the battery heating up too fast and too high due to the large charging current.

And if the output signal of the battery current detection unit repeatedly changes in high and low, or the output signal of the battery voltage detection unit repeatedly changes in high and low, or the output signal of the battery current detection unit repeatedly changes in high and low, determining that a charging repeated opening and disconnection abnormal event occurs. When the battery temperature obtained by the controller according to the output signal of the battery temperature detection circuit reaches the maximum battery temperature threshold, the battery temperature abnormal event is considered to occur.

S4, controlling a voltage regulating circuit to continuously increase the voltage of a current monitoring end of the PWM control chip circuit until an abnormal event disappears; the output voltage of the control voltage regulating circuit is continuously increased, the duty ratio of a PWM signal of the PWM control chip is reduced, the charging current is reduced, if the abnormal event disappears, the current monitoring end voltage of the PWM control chip circuit is stopped to be increased, the control voltage regulating circuit keeps the current monitoring end voltage of the PWM control chip circuit unchanged, and the charging power obtained at the moment is the optimal charging power under the condition of ensuring safety.

And S5, judging whether the real-time charging power reaches the maximum charging power, stopping reducing the current monitoring terminal voltage of the PWM control chip circuit if the real-time charging power reaches the maximum charging power, and returning to continue executing the step S3 if the real-time charging power does not reach the maximum charging power. Whether the real-time charging power reaches the maximum charging power is preferably, but not limited to, judged by the following method: and periodically acquiring the real-time charging power, and if the charging power of the period is not increased or the increment is less than or equal to 3 percent compared with the charging power of the previous period, determining that the maximum charging power is reached.

In the charging control process, the duty ratio of a PWM signal of a PWM control chip is set to be lower or 0, then charging is started, the duty ratio of the PWM signal of the PWM control chip is increased gradually from small to large, charging current is increased gradually, and charging power and abnormal events are monitored synchronously, so that the charging power is ensured to reach the maximum safe allowable value, high-efficiency, safe, stable and reliable charging is realized, the large-power charger/adapter and the small-power charger/adapter can work at the allowable safe maximum output power, and high-efficiency and safe charging in a wide voltage range of the battery is realized.

Example 3

This embodiment provides an apparatus including the wide voltage charge conversion system of embodiment 2 and a battery, a charging terminal of the battery being connected to an output terminal of a BOOST circuit in the wide voltage charge conversion system. The device can be various devices with rechargeable batteries, such as mobile phones, mobile computers and the like.

In the present embodiment, it is preferable that the apparatus charges the battery by the charge control method of embodiment 3.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wide voltage charging conversion circuit is characterized by comprising a BOOST circuit, a PWM control chip circuit with a current control loop, a voltage regulating circuit and a battery detection circuit for detecting charging power;

the electric signal output by the charging power supply is input into a battery charging end after being processed by a BOOST circuit;

the PWM output end of the PWM control chip circuit is connected with the on-off control end of the MOS switch tube of the BOOST circuit, the current monitoring end of the PWM control chip circuit is connected with the output end of the voltage regulating circuit, and the input end of the voltage regulating circuit is connected with the regulating signal output end of the controller;

the battery detection circuit is connected with the controller.

2. The wide voltage charge converter circuit according to claim 1, wherein a drain of the MOS switch transistor of the BOOST circuit is connected to a first end of an inductor of the BOOST circuit, a gate of the MOS switch transistor is connected to the PWM output end of the PWM control chip circuit, and a source of the MOS switch transistor is connected to the common terminal;

the drain electrode of the MOS switch tube is also connected with a first end of an RC series circuit, and/or the first end of the inductance of the BOOST circuit is also connected with a first end of the RC series circuit, and a second end of the RC series circuit is connected with the common end.

3. The wide voltage charge conversion circuit according to claim 1, wherein the battery detection circuit includes a battery current detection unit that detects a battery charge current and a battery voltage detection unit that detects a battery charge voltage;

the output end of the battery current detection unit is connected with the battery current input end of the controller, and the output end of the battery voltage detection unit is connected with the battery voltage input end of the controller.

4. The wide voltage charging conversion circuit according to one of claims 1 to 3, wherein the voltage regulation circuit comprises a voltage follower unit and a low-pass filter unit which are connected in sequence, an input end of the voltage follower unit is connected with a regulation signal output end of the controller, and an output end of the low-pass filter unit is connected with a current monitoring end of the PWM control chip circuit.

5. The wide voltage charge converter circuit according to claim 4, wherein a charge switch unit is connected in series to a connection path between the output terminal of the BOOST circuit and the charge terminal of the battery, and an on-off control terminal of the charge switch unit is connected to the charge control terminal of the controller.

6. The wide voltage charge conversion circuit according to claim 4, further comprising a charging power input detection circuit for detecting whether the charging power is connected and/or an input voltage of the charging power, wherein an output terminal of the charging power input detection circuit is connected to an input detection terminal of the controller.

7. The wide voltage charge converter circuit according to claim 5 or 6, further comprising a battery temperature detection circuit, an output terminal of the battery temperature detection circuit being connected to a battery temperature input terminal of the controller.

8. A wide voltage charge conversion system comprising a controller and the wide voltage charge conversion circuit according to any one of claims 1 to 7, wherein the controller is connected to the voltage regulating circuit, the battery detection circuit, the charge switch unit, the charge power input detection circuit, and the battery temperature detection circuit in the wide voltage charge conversion circuit, respectively.