CN104917267A - Two-in-one charging circuit compatible with MTK and QC2.0 charging schemes - Google Patents

Abstract

The invention discloses a two-in-one charging circuit compatible with MTK and QC2.0 charging schemes, including an EMI processing and rectification and filtering module, a high-frequency transformer, an output rectification and filtering module, and a USB port module that are electrically connected in sequence; the USB port module is connected with The QC2.0 charging scheme identification and detection module, the feedback winding of the high-frequency transformer is connected to the MTK charging scheme identification and detection module, the output of the QC2.0 charging scheme identification and detection module and the MTK charging scheme identification and detection module is connected to the charging output control module, charging The output control module is electrically connected with the high-frequency transformer; the charging scheme of the mobile phone is detected through the corresponding detection module, and the detection result is fed back to the charging output control module, and the voltage output of the high-frequency transformer is controlled by the charging output control module, so as to obtain a suitable The charging voltage of the charging scheme; the present invention can automatically adapt to two charging schemes, and has strong versatility.

Description

Two-in-one charging circuit compatible with MTK and QC2.0 charging solutions

technical field

The invention relates to the technical field of fast charging, in particular to a fast charging circuit for mobile phones compatible with MTK and QC2.0 charging schemes.

Background technique

In the prior art, there are mainly two fast charging schemes for mobile phones, one is the MTK charging scheme of MediaTek Co., Ltd., and the other is the QC2.0 charging scheme of Qualcomm. Different voltage requirements require different charging circuits, so mobile phone chargers using the two charging schemes cannot be shared. With the popularity of smartphones, the inability to share chargers has brought certain difficulties to daily life.

Contents of the invention

The technical problem to be solved by the present invention is to provide a two-in-one charging circuit with strong versatility and compatible with MTK and QC2.0 charging schemes suitable for USB charging.

In order to solve the above technical problems, the technical solution of the present invention is: a two-in-one charging circuit compatible with MTK and QC2.0 charging schemes, including an EMI processing and rectification and filtering module connected to the mains input, and the EMI processing and rectification and filtering module The output end of the high-frequency transformer is electrically connected to the input end of the high-frequency transformer, and the output end of the high-frequency transformer is electrically connected to an output rectification and filtering module, and the output end of the output rectification and filtering module is connected to a USB port module;

A QC2.0 charging scheme identification and detection module is connected between the USB port module and the output rectification and filtering module, the feedback winding of the high-frequency transformer is connected with an MTK charging scheme identification and detection module, and the QC2.0 charging scheme identification The output terminals of the detection module and the MTK charging scheme identification detection module are connected to a charging output control module, and the charging output control module is electrically connected to the high-frequency transformer.

As a preferred technical solution, the QC2.0 charging scheme identification detection module includes a USB charging port D+\D- signal combination detection module electrically connected to the USB port module, and the USB charging port D+\D- signal The output terminal of the combination detection module is electrically connected with MTK and QC2.0 automatic switching module, the output terminal of the output rectification filter module is connected with output sampling and error amplification module, the output terminal of the MTK and QC2.0 automatic switching module is connected with The output sampling and error amplification module is connected, and the output terminal of the output sampling and error amplification module is electrically connected to the charging output control module through an optocoupler module.

As a preferred technical solution, the MTK charging scheme identification detection module includes an output detection and MTK identification module electrically connected to the feedback winding of the high-frequency transformer, and the output terminal of the output detection and MTK identification module is connected to the Charge output control module connection.

As a preferred technical solution, the charging output control module includes a PWM controller, the output end of the PWM controller is connected with a switching tube, and the switching tube is electrically connected with the high-frequency transformer.

A two-in-one charging circuit compatible with MTK and QC2.0 charging schemes, including an EMI processing and rectification and filtering module connected to the mains input, the output of the EMI processing and rectification and filtering module is electrically connected to the input of a high-frequency transformer, The output end of the high-frequency transformer is electrically connected with an output rectification filter module, and the output end of the output rectification filter module is connected with a USB port module;

A QC2.0 charging scheme identification and detection module is connected between the USB port module and the output rectification and filtering module, and the output rectification and filtering module is also connected with an MTK charging scheme identification and detection module, and the QC2.0 charging scheme identification and detection module The module and the output end of the MTK charging scheme identification and detection module are connected with a charging output control module, and the charging output control module is electrically connected with the high-frequency transformer.

As a preferred technical solution, the MTK charging scheme identification detection module includes an output current detection module electrically connected to the output rectification filter module, the output current detection module is connected to an MTK current identification module, and the MTK current identification The module is electrically connected with the charging output control module.

As a preferred technical solution, the QC2.0 charging scheme identification detection module includes a USB charging port D+\D- signal combination detection module electrically connected to the USB port module, and the USB charging port D+\D- signal The output terminal of the combination detection module is electrically connected with MTK and QC2.0 automatic switching module, the output terminal of the output rectification filter module is connected with output sampling and error amplification module, the output terminal of the MTK and QC2.0 automatic switching module is connected with The output sampling and error amplification module is connected, and the output terminal of the output sampling and error amplification module is electrically connected to the charging output control module through an optocoupler module.

As a preferred technical solution, the charging output control module includes a PWM controller, the output end of the PWM controller is connected with a switching tube, and the switching tube is electrically connected with the high-frequency transformer.

Due to the adoption of the above technical solution, the 2-in-1 charging circuit compatible with MTK and QC2.0 charging solutions includes an EMI processing and rectification and filtering module connected to the mains input, and the output of the EMI processing and rectification and filtering module is connected to the high-frequency The input end of the transformer is electrically connected, the output end of the high-frequency transformer is electrically connected with an output rectification filter module, and the output end of the output rectification filter module is connected with a USB port module; the USB port module and the output rectification filter module A QC2.0 charging scheme identification and detection module is connected between them, the feedback winding of the high-frequency transformer is connected with an MTK charging scheme identification and detection module, the QC2.0 charging scheme identification and detection module and the MTK charging scheme identification and detection module The output end is connected with a charging output control module, and the charging output control module is electrically connected to the high-frequency transformer; the charging scheme adopted by the mobile phone is detected by the QC2.0 charging scheme identification and detection module and the MTK charging scheme identification and detection module, and the detection The result is fed back to the charging output control module, and the voltage output of the high-frequency transformer is controlled by the charging output control module, so that the charging voltage suitable for the charging scheme is obtained at the USB port module; the invention can automatically adapt to two charging schemes, and has strong versatility.

Description of drawings

Fig. 1 is a functional block diagram of Embodiment 1 of the present invention;

Fig. 2 is a working principle block diagram of an MTK charging scheme according to Embodiment 1 of the present invention;

Fig. 3 is a working principle block diagram of a QC2.0 charging scheme according to Embodiment 1 of the present invention;

Fig. 4 is a kind of circuit diagram of embodiment 1 of the present invention;

Fig. 5 is another circuit diagram of Embodiment 1 of the present invention;

Fig. 6 is a functional block diagram of Embodiment 2 of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, further elaborate the present invention. In the following detailed description, certain exemplary embodiments of the invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments can be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

Embodiment one:

As shown in Figure 1, the two-in-one charging circuit compatible with MTK and QC2.0 charging schemes includes an EMI processing and rectification and filtering module connected to the mains input, the output of the EMI processing and rectification and filtering module is connected to a high-frequency transformer The input end of the high-frequency transformer is electrically connected to an output rectification and filtering module, and the output of the output rectification and filtering module is connected to a USB port module;

A QC2.0 charging scheme identification and detection module is connected between the USB port module and the output rectification and filtering module, and the QC2.0 charging scheme identification and detection module includes a USB charging port D+\ that is electrically connected to the USB port module D-signal combination detection module, the output terminal of the USB charging port D+\D-signal combination detection module is electrically connected with MTK and QC2.0 automatic switching module, and the output terminal of the output rectification filter module is connected with output sampling and error An amplification module, the output of the MTK and QC2.0 automatic switching module is connected to the output sampling and error amplification module, the output of the output sampling and error amplification module is electrically connected to the charging output control module through the optocoupler module connect. The feedback winding of the high-frequency transformer is connected with an MTK charging scheme identification and detection module, the MTK charging scheme identification and detection module includes an output detection and MTK identification module electrically connected to the feedback winding of the high-frequency transformer, the output detection and The output end of the MTK identification module is connected with the charging output control module. The output terminals of the QC2.0 charging scheme identification and detection module and the MTK charging scheme identification and detection module are connected with a charging output control module, and the charging output control module includes a PWM controller, and the output terminal of the PWM controller is connected with a A switch tube, the switch tube is electrically connected to the high-frequency transformer, and the switch tube is electrically connected to the high-frequency transformer. The output sampling of the QC2.0 charging scheme identification detection module and the output terminal of the error amplification module are connected to the PWM controller through the optocoupler module, and the output detection of the MTK charging scheme identification detection module and the MTK identification module are connected to the PWM controller. Controller connection.

The present invention can quickly charge smart phones with fast charging functions using MTK (MediaTek solution) and QC2.0 (Qualcomm solution), and can automatically identify two different charging solutions to achieve the charging of corresponding solutions respectively protocol

When the charging circuit uses the MTK fast charging scheme, as shown in Figure 2, the PWM controller is used to detect the output voltage signal induced on the feedback winding of the high-frequency transformer, and then the PWM controller processes this signal to control the duty cycle of the switch tube to adjust the output voltage of the high-frequency transformer; when the charging circuit adopts the QC2.0 fast charging scheme, as shown in Figure 3, the signal combination on the USB charging port D+\D- is detected, and then the detected data is sent to PWM controller, the PWM controller modulates the signal to adjust the characteristics of the corresponding output voltage to adapt to the QC2.0 fast charging scheme; the invention can automatically identify and charge the MTK fast charging scheme and the QC2.0 fast charging scheme in the same circuit.

The specific working principle of the present invention is as follows: when the circuit is connected to the mains but no MTK signal or QC2.0 signal is detected, the USB port module outputs 5V voltage. When the charging signal of the MTK scheme is detected, the PWM controller detects the auxiliary winding of the high-frequency transformer that has induced the output voltage signal, and then controls the increase or decrease of the duty cycle of the switch tube to adjust the output according to the detected signal. increase or decrease in voltage. During this process, the QC2.0 control loop is disconnected at this time. If the MTK/QC2.0 automatic switching circuit detects that the D+/D- signal combination on the USB output port is the signal combination agreed by the QC2.0 charging protocol, the MTK/QC2.0 automatic switching circuit turns off the MTK identification loop, and the PWM The controller adjusts the output voltage according to the combination of signals on D+\D- of the USB port.

A fast charging scheme in the present invention is Qualcomm's QC2.0 scheme, which uses the voltage of D+ and D- of the USB port to inform the charger of the voltage that should be output. When there is no signal voltage matching the QC2.0 scheme, the USB port The output voltage of the USB port is 5V. If the voltage of D+ and D- is within the range of the QC2.0 scheme, the output voltage of the USB port will increase to 9V, 12V or 20V, depending on the voltage of D+ and D-.

Another fast charging solution in the present invention is the solution of MediaTek MTK. This fast charging system uses the output current signal of the USB port to complete the communication with the charger and the charged product. Under normal circumstances, the output voltage of the USB port is also 5V. When the output current changes to generate a corresponding voltage signal that matches the MTK scheme, the output voltage of the charger will be increased to 7V, 9V or 12V. The signal is transmitted to the detection IC through one of the windings of the transformer, and then the output voltage is changed.

In the embodiment of the present invention, each module in the schematic block diagram shown in Fig. 1 can be realized by using a relatively common, mature module with the same function in the prior art, and there are many kinds of specific circuit diagrams that can realize the function of the schematic block diagram shown in Fig. Figure 4 and Figure 5 show two of them.

As shown in Figure 4, when the output voltage is greater than the initial voltage set by the QC2.0 loop (for example, set at 3.5V and the output is 5V), then the optocoupler U1A in the QC2.0 loop will be A relatively large current flows through, so that the impedance of the other half of the photocouple U1B is in a low impedance state. In the MTK output voltage detection loop in Figure 4, it can be seen that U1B is connected in series with resistor R12. When the impedance of U1B is in a low impedance state, the output voltage of the MTK loop is mainly determined by R12 and R22. The setting of these two resistors is Initial 5V voltage. If the MTK loop receives a signal at this time, it will output other voltages higher than 5V according to the MTK standard. At this time, the impedance of photocouple U1B will continue to be in a low impedance state, and the voltage is still controlled by the MTK loop.

At this time, if the MTK loop does not receive the signal, but the QC2.0 loop receives the signal, then the optocoupler U1A of the QC2.0 loop will flow a relatively small current until the output voltage rises to QC2 The other voltages set by the loop of QC2.0, at this time, the current of U1A just makes U1B impedance series R12 and R22 just set to other voltages set by the loop of QC2.0. (This is automatically achieved in the negative feedback loop) In this way, the automatic switching between the MTK loop and the QC2.0 loop system is achieved, and the only care is that he receives the number of that system.

In Figure 5, it can be seen that the initial voltage of 5V is set and executed by the MTK loop, that is, 5V is only controlled and set by the MTK loop. At the beginning, the loop of QC2.0 is cut off by Q3. When no signal is received by either system, only the MTK loop is working. And the output voltage is set to 5V. Afterwards, when the MTK loop receives a signal, it will output other voltages higher than 5V according to the MTK standard, which is the same as only the MTK loop. Because the loop of QC2.0 is cut off by Q3.

If the QC2.0 standard signal is received at this time, Q3 will be turned on, and the MTK loop will be cut off at the same time. At this time, only the QC2.0 control loop is working, and the voltage is set to the QC2.0 standard the set voltage.

Embodiment two:

This embodiment is basically the same as Embodiment 1, the difference is that: as shown in Figure 6, the two-in-one charging circuit compatible with MTK and QC2.0 charging schemes includes an EMI processing and rectification and filtering module connected to the mains input, The output end of the EMI processing and rectification and filtering module is electrically connected to the input end of the high-frequency transformer, the output end of the high-frequency transformer is electrically connected to an output rectification and filtering module, and the output end of the output rectification and filtering module is connected to a USB port module;

A QC2.0 charging scheme identification and detection module is connected between the USB port module and the output rectification and filtering module, and the output rectification and filtering module is also connected with an MTK charging scheme identification and detection module, and the QC2.0 charging scheme identification and detection module The module and the output end of the MTK charging scheme identification and detection module are connected with a charging output control module, and the charging output control module is electrically connected with the high-frequency transformer.

The MTK charging scheme identification detection module includes an output current detection module electrically connected to the output rectification filter module, the output current detection module is connected to an MTK current identification module, and the MTK current identification module is connected to the charging output control module electrical connection. The output current signal of MTK is detected directly in the output circuit, no longer using a transformer for detection. The QC2.0 charging scheme identification detection module includes a USB charging port D+\D- signal combination detection module electrically connected to the USB port module, and the output terminal of the USB charging port D+\D- signal combination detection module is electrically connected to There is an MTK and QC2.0 automatic switching module, the output terminal of the output rectification and filtering module is connected with an output sampling and error amplification module, and the output terminal of the MTK and QC2.0 automatic switching module is connected to the output sampling and error amplification module connected, the output terminal of the output sampling and error amplification module is electrically connected to the charging output control module through the optocoupler module. The charging output control module includes a PWM controller, the output end of the PWM controller is connected with a switching tube, and the switching tube is electrically connected with the high frequency transformer.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme, it is characterized in that: comprise the EMI process and rectification filtering module that are connected with civil power input, described EMI process and the output of rectification filtering module are electrically connected with the input of high frequency transformer, the output of described high frequency transformer is electrically connected with output rectification filter module, and the output of described output rectification filter module is connected with USB port module;

QC2.0 charging scheme recognition detection module is connected with between described USB port module and described output rectification filter module, the feedback winding switching of described high frequency transformer has MTK charging scheme recognition detection module, the output of described QC2.0 charging scheme recognition detection module and described MTK charging scheme recognition detection module is connected with charging output control module, and described charging output control module is electrically connected with described high frequency transformer.

2. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme as claimed in claim 1, it is characterized in that: described QC2.0 charging scheme recognition detection module comprise the USB charging port D+ that is electrically connected with described USB port module D-signal combination detection module, described USB charging port D+ the output of D-signal combination detection module be electrically connected with MTK and QC2.0 automatic switching module, the output of described output rectification filter module is connected with and exports sampling and error amplification module, the output of described MTK and QC2.0 automatic switching module to sample and error amplification module is connected with described output, the described output exporting sampling and error amplification module is electrically connected with described charging output control module by optical coupling module.

3. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme as claimed in claim 1, it is characterized in that: described MTK charging scheme recognition detection module comprises the output detections and MTK identification module that are connected with the feedback winding electric of described high frequency transformer, and the output of described output detections and MTK identification module is connected with described charging output control module.

4. the two-in-one charging circuit of compatible MTK and the QC2.0 charging scheme as described in claim 1,2 or 3, it is characterized in that: described charging output control module comprises PWM controller, the output of described PWM controller is connected with switching tube, and described switching tube is electrically connected with described high frequency transformer.

5. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme, it is characterized in that: comprise the EMI process and rectification filtering module that are connected with civil power input, described EMI process and the output of rectification filtering module are electrically connected with the input of high frequency transformer, the output of described high frequency transformer is electrically connected with output rectification filter module, and the output of described output rectification filter module is connected with USB port module;

QC2.0 charging scheme recognition detection module is connected with between described USB port module and described output rectification filter module, described output rectification filter module is also connected with MTK charging scheme recognition detection module, the output of described QC2.0 charging scheme recognition detection module and described MTK charging scheme recognition detection module is connected with charging output control module, and described charging output control module is electrically connected with described high frequency transformer.

6. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme as claimed in claim 5, it is characterized in that: described MTK charging scheme recognition detection module comprises the output electric current measure module be electrically connected with described output rectification filter module, described output electric current measure model calling has MTK electric current identification module, and described MTK electric current identification module is electrically connected with described charging output control module.

7. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme as claimed in claim 1, it is characterized in that: described QC2.0 charging scheme recognition detection module comprise the USB charging port D+ that is electrically connected with described USB port module D-signal combination detection module, described USB charging port D+ the output of D-signal combination detection module be electrically connected with MTK and QC2.0 automatic switching module, the output of described output rectification filter module is connected with and exports sampling and error amplification module, the output of described MTK and QC2.0 automatic switching module to sample and error amplification module is connected with described output, the described output exporting sampling and error amplification module is electrically connected with described charging output control module by optical coupling module.

8. the two-in-one charging circuit of compatible MTK and QC2.0 charging scheme as claimed in claim 5, it is characterized in that: described charging output control module comprises PWM controller, the output of described PWM controller is connected with switching tube, and described switching tube is electrically connected with described high frequency transformer.