Constant-current and constant-voltage adjusting system, AC / DC power module architecture and electronic equipment

Abstract

The utility model provides a constant-current and constant-voltage adjusting system, an AC / DC power supply module architecture and electronic equipment. The constant-current and constant-voltage adjusting system comprises a constant-current and constant-voltage adjusting chip, a compensation module and an optocoupler adjusting module, the constant-current and constant-voltage adjusting chip comprises a constant-voltage unit, a constant-current unit, a first switch unit, a comparison control unit, a current sampling unit and a voltage sampling unit. In the constant current mode, the constant current and constant voltage adjusting chip and the optocoupler adjusting module jointly maintain the output current of the AC / DC power supply module at a first set value. In the constant-voltage mode, the constant-current constant-voltage adjusting chip and the optocoupler adjusting module jointly maintain the output voltage of the AC / DC power supply module at a second set value; according to the constant-current and constant-voltage adjusting system, switching control is carried out on port connection of the first switch unit through the comparison control unit, so that the constant-voltage unit and the constant-current unit can share the compensation module, the number of devices in the compensation module is reduced, the number of pins of a constant-current and constant-voltage adjusting chip is also reduced, and the integration degree of the constant-current and constant-voltage adjusting system is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, and in particular to a constant current and constant voltage regulation system, an AC / DC power supply module architecture, and electronic equipment. Background Art

[0002] In recent years, as mobile devices such as smartphones, tablets, and laptops have become larger and faster in terms of screen size and processor speed, their power consumption has increased significantly. To meet user expectations for extended standby time, the capacity of their batteries has continued to increase. To reduce charging time, the charging power required has also increased accordingly. However, due to the physical limitations of the maximum current of the Universal Serial Bus (USB), chargers can only provide greater charging power to mobile devices by increasing their output voltage.

[0003] The USB Association is working towards a universal charger that can charge devices with a variety of charging power requirements. In existing technologies, the constant current and constant voltage regulation systems used in such chargers often require many compensation components, resulting in a low level of integration.

[0004] Therefore, providing a constant current and constant voltage regulation system with fewer compensation components has become a technical problem that needs to be solved urgently in the industry. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a constant current and constant voltage regulation system, an AC / DC power supply module architecture and an electronic device, which solves the problems caused by compensation components in the constant current and constant voltage regulation system.

[0006] To solve the above technical problems, the present invention provides a constant current and constant voltage regulation system for regulating the output current of an AC / DC power supply module and regulating the output voltage of the AC / DC power supply module. The system comprises a constant current and constant voltage regulation chip, a compensation module, and an optocoupler regulation module.

[0007] The constant current and constant voltage regulation chip includes: a constant voltage unit, a constant current unit, a first switch unit, a comparison control unit, a current sampling unit, and a voltage sampling unit; the input pin of the constant current and constant voltage regulation chip is connected to the output end of the AC / DC power supply module; the current sampling unit is used to sample the output current of the AC / DC power supply module to obtain a first sampling voltage and output it; the voltage sampling unit is used to sample the output voltage of the AC / DC power supply module to obtain a second sampling voltage and output it; the first end of the first switch unit is connected to the output end of the current sampling unit, the second end of the first switch unit is connected to the output end of the voltage sampling unit, and the third end of the first switch unit serves as the constant current and constant voltage a compensation pin of the regulating chip; the comparison control unit is used to compare the first sampling voltage and the second sampling voltage, and output a first control signal to the control end of the first switching unit according to the comparison result, so as to control the third end of the first switching unit to be connected to the first end of the first switching unit or the second end of the first switching unit; the constant current unit is used to amplify and output a first output voltage according to the difference between the first sampling voltage and the first reference voltage, and the constant voltage unit is used to amplify and output a second output voltage according to the difference between the second sampling voltage and the second reference voltage, and the output end of the constant current unit is connected to the output end of the constant voltage unit and serves as the optocoupler adjustment pin of the constant current and constant voltage regulating chip;

[0008] The first end of the compensation module is connected to the optocoupler adjustment pin of the constant current and constant voltage regulation chip, and the second end of the compensation module is connected to the compensation pin of the constant current and constant voltage regulation chip. The compensation module is used to perform loop compensation on the constant voltage unit or the constant current unit;

[0009] The optocoupler regulation module is used to maintain the output current of the AC / DC power supply module at a first set value based on the output voltage of the AC / DC power supply module and the first output voltage; the optocoupler regulation module is also used to maintain the output voltage of the AC / DC power supply module at a second set value based on the output voltage of the AC / DC power supply module and the second output voltage.

[0010] Optionally, the compensation module includes a compensation resistor and a compensation capacitor, the first end of the compensation resistor is connected to the optocoupler adjustment pin of the constant current and constant voltage regulation chip, the second end of the compensation resistor is connected to the first end of the compensation capacitor, and the second end of the compensation capacitor is connected to the compensation pin of the constant current and constant voltage regulation chip.

[0011] Optionally, the constant current unit includes a first operational amplifier unit and a constant current power tube, the first input end of the first operational amplifier unit is connected to the output end of the current acquisition unit, the second input end of the first operational amplifier unit is connected to the first reference voltage, and the first operational amplifier unit is used to output a first drive signal to the control end of the constant current power tube according to the change of the difference between the first sampling voltage and the first reference voltage; the second end of the constant current power tube is coupled to the first end of the optocoupler regulation module, and the constant current power tube is used to adjust the first output voltage output by itself according to the first drive signal, and the first output voltage is output to the first end of the optocoupler regulation module.

[0012] Optionally, the constant voltage unit includes a second operational amplifier unit and a constant voltage power tube, the first input end of the second operational amplifier unit is connected to the output end of the voltage acquisition unit, the second input end of the second operational amplifier unit is connected to the second reference voltage, and the second operational amplifier unit is used to output a second drive signal to the control end of the constant voltage power tube according to the change of the difference between the second sampling voltage and the second reference voltage; the second end of the constant voltage power tube is coupled to the first end of the optocoupler regulation module, and the constant voltage power tube is used to adjust the second output voltage output by itself according to the second drive signal, and the second output voltage is output to the first end of the optocoupler regulation module.

[0013] Optionally, the constant current power tube and the constant voltage power tube both include NMOS tubes.

[0014] Optionally, the input pin of the constant current and constant voltage regulation chip is specifically an EPAD pin.

[0015] Optionally, the constant current and constant voltage regulation chip also includes a power tube, an internal power supply module, a power drive module, a logic control module and a protocol module; the internal power supply module is used to provide a power supply voltage for the internal module of the constant current and constant voltage regulation chip; the protocol module is used to detect the insertion of the device to be charged, and detect and output the target voltage and target current of the device to be charged. The protocol module is also used to output a first enable signal to the logic control module according to the insertion of the device to be charged; the logic control module is used to output a second control signal to the power drive module according to the first enable signal; the power drive module is used to output a third drive signal to the control end of the power tube according to the second control signal; the first end of the power tube is connected to the input pin of the constant current and constant voltage regulation chip, and the second end of the power tube is connected to the output pin of the constant current and constant voltage regulation chip. The power tube is used to control its own conduction and shutdown according to the third drive signal.

[0016] Optionally, the optocoupler regulation module includes a first optocoupler regulation subunit and a second optocoupler regulation subunit; the first end of the first optocoupler regulation subunit serves as the first end of the optocoupler regulation module, and the second end of the first optocoupler regulation subunit serves as the second end of the optocoupler regulation module; the first optocoupler regulation subunit is used to regulate the first current flowing through itself according to the output voltage of the AC / DC power supply module and the first output voltage, and transmit the first current to the second optocoupler regulation subunit through optocoupler action; the first end and the second end of the second optocoupler regulation subunit are respectively coupled to the input end and the ground end of the AC / DC power supply module, and the second optocoupler regulation subunit is used to control the output voltage and output current of the AC / DC power supply module according to the first current.

[0017] Optionally, the first optocoupler adjustment subunit includes a first optocoupler resistor and an optocoupler diode; the first end of the first optocoupler resistor serves as the second end of the first optocoupler adjustment subunit, and the second end of the first optocoupler resistor is coupled to the positive electrode of the optocoupler diode; the negative electrode of the optocoupler diode serves as the first end of the first optocoupler adjustment subunit.

[0018] Optionally, the second optocoupler regulation subunit includes a first switching tube, a second optocoupler resistor, an optocoupler transistor and a main power control unit; the emitter of the optocoupler transistor is connected to the first end of the second optocoupler resistor and serves as the second end of the second optocoupler regulation subunit, and the collector of the optocoupler transistor is connected to the main power control unit; the second end of the second optocoupler resistor is connected to the first end of the first switching tube; the second end of the first switching tube serves as the first end of the second optocoupler regulation subunit, and the control end and the first end of the first switching tube are both connected to the main power control unit; the main power control unit is used to output a third control signal according to the first current input by the optocoupler transistor to control the conduction and shutdown of the first switching tube.

[0019] Correspondingly, the technical solution of the present invention also provides an AC / DC power supply module architecture for powering the device to be charged, including an AC / DC power supply module, a constant current and constant voltage regulation system provided by the technical solution of the present invention, and a USB interface; the input pin of the constant current and constant voltage regulation chip is coupled to the output end of the AC / DC power supply module, the output end of the optocoupler regulation module is coupled to the input end of the AC / DC power supply module, and the constant current and constant voltage regulation system is used to maintain the output current of the AC / DC power supply module at a first set value, and maintain the output voltage of the AC / DC power supply module at a second set value; the output pin of the constant current and constant voltage regulation system is coupled to the USB interface; the USB interface is used to insert the device to be charged.

[0020] Correspondingly, the technical solution of the present invention further provides an electronic device, comprising the AC / DC power module architecture.

[0021] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0022] In the constant current and constant voltage regulation system of the technical solution of the present utility model, the port connection of the first switch unit is switched and controlled by the comparison control unit so that the constant voltage unit and the constant current unit can share the compensation module, which not only reduces the number of components in the compensation module, but also reduces the number of pins of the constant current and constant voltage regulation chip, thereby improving the integration of the constant current and constant voltage regulation system.

[0023] Furthermore, setting the input pin of the constant current and constant voltage regulation chip as the EPAD pin reduces the length of the chip's binding wires, lowers the impedance of the binding wires, and thus improves power transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a circuit diagram of an embodiment of a constant current and constant voltage regulation system;

[0025] Figure 2 This is the system structure of the constant current and constant voltage regulation system provided by the technical solution of this utility model Figure 1 ;

[0026] Figure 3 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 2 ;

[0027] Figure 4 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 3 ;

[0028] Figure 5 This is a chip pin diagram of the constant current and constant voltage regulation chip provided by an embodiment of the utility model;

[0029] Figure 6 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 4 ;

[0030] Figure 7 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 5 ;

[0031] Figure 8 This is a circuit structure diagram of a constant current unit and a constant voltage unit provided by an embodiment of the present utility model;

[0032] Figure 9This is a structural diagram of the AC / DC power module architecture provided by the technical solution of this utility model. DETAILED DESCRIPTION

[0033] As described in the background art, the existing constant current and constant voltage regulation system has the problem of having many compensation components and low integration.

[0034] Figure 1 The present invention is a circuit structure diagram of an embodiment of a constant current and constant voltage regulation system.

[0035] Please refer to Figure 1 The embodiment of the constant current and constant voltage regulation system is used to perform constant current regulation on the output current of the AC / DC power supply module and to perform constant voltage regulation on the output voltage of the AC / DC power supply module. The embodiment includes: a constant current and constant voltage regulation chip, a first compensation module, a second compensation module, and an optocoupler regulation module.

[0036] The constant current and constant voltage regulation chip is used to collect the output current of the AC / DC power supply module and output a first output voltage based on the difference between the collected first collected voltage and the first reference voltage. The constant current and constant voltage regulation chip is also used to collect the output voltage of the AC / DC power supply module and output a second output voltage based on the difference between the collected second collected voltage and the second reference voltage. The optocoupler regulation module is used to maintain the output current of the AC / DC power supply module at a first set value based on the output voltage of the AC / DC power supply module and the first output voltage. The optocoupler regulation module is also used to maintain the output voltage of the AC / DC power supply module at a second set value based on the output voltage of the AC / DC power supply module and the second output voltage.

[0037] The constant current and constant voltage regulation chip is provided with a constant voltage compensation pin and a constant current compensation pin. The constant voltage compensation pin is connected to the optocoupler regulation module through the first compensation module. The first compensation module is used to perform constant voltage compensation on the constant current and constant voltage regulation chip. The constant current compensation pin is connected to the optocoupler regulation module through the second compensation module. The second compensation module is used to perform constant current compensation on the constant current and constant voltage regulation chip.

[0038] The problem with the embodiment of the constant current and constant voltage regulation system is that it is necessary to respectively set a first compensation module for constant voltage compensation and a second compensation module for constant current compensation for the constant current and constant voltage regulation chip, so as to set the constant voltage compensation pin and the constant current compensation pin on the constant current and constant voltage regulation chip, resulting in too many compensation devices in the constant current and constant voltage regulation system and too many pins of the constant current and constant voltage regulation chip, thereby reducing the system's integration.

[0039] In view of this, the technical solution of the present utility model provides a new constant current and constant voltage regulation system for performing constant current regulation on the output current of the AC / DC power module and performing constant voltage regulation on the output voltage of the AC / DC power module.

[0040] in, Figure 2 This is the system structure of the constant current and constant voltage regulation system provided by the technical solution of this utility model Figure 1 .

[0041] Please refer to Figure 2 The constant current and constant voltage regulation system provided by the technical solution of the present utility model includes: a constant current and constant voltage regulation chip 10, a compensation module 30 and an optocoupler regulation module 20;

[0042] The constant current and constant voltage regulating chip 10 includes: a constant voltage unit 11, a constant current unit 12, a first switch unit 13, a comparison control unit 16, a current sampling unit 15, and a voltage sampling unit 14; the input pin of the constant current and constant voltage regulating chip 10 is connected to the output end of the AC / DC power supply module; the current sampling unit 15 is used to sample the output current of the AC / DC power supply module to obtain and output a first sampling voltage Vifb; the voltage sampling unit 14 is used to sample the output voltage of the AC / DC power supply module to obtain and output a second sampling voltage Vvfb; the first end of the first switch unit 13 is connected to the output end of the current sampling unit 15, the second end of the first switch unit 13 is connected to the output end of the voltage sampling unit 14, and the third end of the first switch unit 13 serves as the compensation pin of the constant current and constant voltage regulating chip 10 compensation pin FB; the comparison control unit 16 is used to compare the first sampling voltage Vifb and the second sampling voltage Vvfb, and output a first control signal to the control end of the first switch unit 13 according to the comparison result, so as to control the third end of the first switch unit 13 to be connected to the first end of the first switch unit 13 or the second end of the first switch unit 13; the constant current unit 12 is used to amplify and output a first output voltage V10 according to the difference between the first sampling voltage Vifb and the first reference voltage Viref, and the constant voltage unit 11 is used to amplify and output a second output voltage according to the difference between the second sampling voltage Vvfb and the second reference voltage Vvref, and the output end of the constant current unit 12 is connected to the output end of the constant voltage unit 11 and serves as the optocoupler adjustment pin of the constant current and constant voltage regulation chip 10;

[0043] The first end of the compensation module 30 is connected to the optocoupler adjustment pin of the constant current and constant voltage regulation chip 10, and the second end of the compensation module 30 is connected to the compensation pin FB of the constant current and constant voltage regulation chip 10. The compensation module 30 is used to perform loop compensation on the constant voltage unit 11 or the constant current unit 12;

[0044] The optocoupler regulation module 20 is used to maintain the output current of the AC / DC power supply module at a first set value based on the output voltage of the AC / DC power supply module and the first output voltage V10; the optocoupler regulation module 20 is also used to maintain the output voltage of the AC / DC power supply module at a second set value based on the output voltage of the AC / DC power supply module and the second output voltage.

[0045] Through the above technical means, the technical solution of the utility model not only reduces the number of components in the compensation module 30, but also reduces the number of pins of the constant current and constant voltage regulation chip 10, thereby improving the integration of the constant current and constant voltage regulation system. The specific principle is:

[0046] In the constant current and constant voltage regulation system of the present invention, the comparison control unit 16 compares the first sampled voltage Vifb with the second sampled voltage Vvfb to determine whether the AC / DC power module requires constant current regulation or constant voltage regulation. If the AC / DC power module requires constant current regulation, the comparison control unit 16 controls the first end of the first switch unit 13 to connect to its third end, so that the compensation module 30 performs loop compensation on the constant current unit 12. If the AC / DC power module requires constant voltage regulation, the comparison control unit 16 controls the second end of the first switch unit 13 to connect to its third end, so that the compensation module 30 performs loop compensation on the constant voltage unit 11. Compared to the prior art, the constant voltage unit 11 and the constant current unit 12 in the present invention can share a single compensation module 30 for loop compensation. The constant current and constant voltage regulation chip 10 only needs to be provided with a single compensation pin FB, reducing the number of compensation components and the number of chip pins, thereby improving the integration of the constant current and constant voltage regulation system.

[0047] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] Figure 3 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 2 .

[0049] Please refer to Figure 3As a specific embodiment, the compensation module 30 includes a compensation resistor R1 and a compensation capacitor C1. The first end of the compensation resistor R1 is connected to the optocoupler adjustment pin of the constant current and constant voltage regulating chip 10, the second end of the compensation resistor R1 is connected to the first end of the compensation capacitor C1, and the second end of the compensation capacitor C1 is connected to the compensation pin FB of the constant current and constant voltage regulating chip 10. However, the prior art requires the provision of a first compensation module 30 and a second compensation module 30. Therefore, the first compensation module 30 is specifically composed of a resistor and a capacitor connected in series, and the second compensation module 30 is also specifically composed of a resistor and a capacitor connected in series. Therefore, the technical solution of the present utility model reduces the number of compensation resistors R1 and compensation capacitors C1 compared to the prior art, and improves the system integration.

[0050] Figure 4 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 3 .

[0051] Figure 5 This is a chip pin diagram of the constant current and constant voltage regulation chip provided by an embodiment of the present utility model.

[0052] Please refer to Figure 4 and Figure 5 As a specific embodiment, the input pin of the constant current and constant voltage regulator chip 10 is specifically the EPAD pin. This embodiment has the beneficial effect of connecting the binding wire of the output end of the AC / DC power supply module to the EPAD pin of the constant current and constant voltage regulator chip 10 package, thereby reducing the length of the binding wire and lowering the resistance of the binding wire, thereby improving power transmission efficiency.

[0053] Figure 6 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 4 .

[0054] Please refer to Figure 6As a specific embodiment, the constant current and constant voltage regulation chip 10 further includes a power tube 111, an internal power supply module 16, a power drive module 19, a logic control module 18, a fault detection module 112 and a protocol module 17; the internal power supply module 16 is used to provide a power supply voltage for the internal modules of the constant current and constant voltage regulation chip 10; the protocol module 17 is used to detect the insertion of the device to be charged, and detect and output the target voltage and target current of the device to be charged. The protocol module 17 is also used to output a first enable signal to the logic control module 18 according to the insertion of the device to be charged; the logic control module 18 is used to output a second control signal to the power drive module 19 according to the first enable signal; the The power driving module 19 is used to output a third driving signal to the control end of the power tube 111 according to the second control signal; the first end of the power tube 111 is connected to the input pin of the constant current and constant voltage regulating chip 10, and the second end of the power tube 111 is connected to the output pin of the constant current and constant voltage regulating chip 10, and the power tube 111 is used to control its own conduction and shutdown according to the third driving signal; the fault detection module 112 is used to determine whether the chip is working normally based on the output voltage of the AC / DC power supply module, the first sampling voltage Vifb and the internal temperature of the chip; if it is determined that the chip cannot work normally, the third control signal is output to the logic control module 18 to shut down the power tube 111.

[0055] The specific working process of the constant current and constant voltage regulating chip 10 is as follows:

[0056] Please refer to Figure 6The internal power supply module 16 is used to provide a stable power supply voltage for the internal modules of the constant current and constant voltage regulator chip 10. The protocol module 17 communicates with a USB Type-C device to be charged via the chip's positive data signal pin, negative data signal pin, first configuration channel pin, and second configuration channel pin to detect the device's insertion. Upon detecting the USB Type-C device's insertion, the protocol module 17 also outputs a first enable signal and obtains and outputs the target voltage and target current of the device to be charged. The target voltage represents the second reference voltage Vvref, and the target current represents the first reference voltage Viref. Based on the first enable signal, the logic control module 18 outputs a second control signal to the power driver module 19, causing it to output a third drive signal to the gate of the power transistor 111, thereby turning on the power transistor 111. After the power transistor 111 is turned on, the current sampling unit 15 samples the output current of the AC / DC power module based on the voltage difference signal between the drain and source of the power transistor 111 and outputs the first sampled voltage Vifb. The voltage sampling unit 14 performs resistor division on the output voltage of the AC / DC power module and outputs a second sampled voltage Vvfb. The constant current unit 12 is configured to control the first output voltage V10 outputted by the constant current unit 12 based on the first sampled voltage Vifb and the target current. The optocoupler regulation module 20 controls the output current of the AC / DC power module to a first set value based on the first output voltage V10. The constant current unit 12 is configured to control the second output voltage outputted by the constant current unit 12 based on the second sampled voltage Vvfb and the target voltage. The optocoupler regulation module 20 also controls the output voltage of the AC / DC power module to a second set value based on the second output voltage.

[0057] Figure 7 This is the system structure of the constant current and constant voltage regulation system provided by the embodiment of the utility model Figure 5 .

[0058] Please refer to Figure 7As a specific embodiment, the optocoupler regulation module 20 includes a first optocoupler regulation subunit 21 and a second optocoupler regulation subunit 22; the first end of the first optocoupler regulation subunit 21 serves as the first end of the optocoupler regulation module 20, and the second end of the first optocoupler regulation subunit 21 serves as the second end of the optocoupler regulation module 20; the first optocoupler regulation subunit 21 is used to regulate the first current flowing through itself according to the output voltage VOUT of the AC / DC power supply module 2 and the first output voltage V10, and transmit the first current to the second optocoupler regulation subunit 22 through optocoupler action; the first end and the second end of the second optocoupler regulation subunit 22 are respectively coupled to the input end and the ground end of the AC / DC power supply module 2, and the second optocoupler regulation subunit 22 is used to output the first current transmitted to the AC / DC power supply module 2. Specifically, the first optocoupler adjustment subunit 21 includes a first optocoupler resistor R2 and an optocoupler diode; the first end of the first optocoupler resistor R2 serves as the second end of the first optocoupler adjustment subunit 21, and the second end of the first optocoupler resistor R2 is coupled to the anode of the optocoupler diode; the cathode of the optocoupler diode serves as the first end of the first optocoupler adjustment subunit 21. The second optocoupler adjustment subunit 22 includes an optocoupler transistor, a first optocoupler capacitor C2, a second optocoupler resistor R3, a main power control unit 221, and a first switch tube M3; the first optocoupler capacitor C2 is coupled between the first end and the second end of the optocoupler transistor; the second optocoupler resistor R3 is coupled between the first high voltage VPP and the second end of the optocoupler transistor, and the first end of the optocoupler transistor is grounded; the output end of the main power control unit 221 is coupled to the control end of the first switch tube M3; the first end of the first switch tube M3 is coupled to the input end of the AC / DC power module 2, and the second end of the first switch tube M3 is grounded. Specifically, if the first switch M3 comprises an NMOS transistor, the first and second ends of the first switch M3 correspond to the source and drain of the NMOS transistor, respectively, and the control end corresponds to the gate. Of course, the first switch M3 may also comprise a triode, such as an NPN-type triode or a PNP-type triode. If it is an NPN-type triode, the control end, first end, and second end of the first switch M3 correspond to the base, collector, and emitter, respectively. If it is a PNP-type triode, the control end, first end, and second end of the first switch M3 correspond to the base, emitter, and collector, respectively. Of course, the specific circuit structure can be selected based on needs and is not limited here.

[0059] The optocoupler diode and the optocoupler transistor form a photoelectric coupler for level conversion and electrical isolation, so as to drive the main power control unit 221 and ensure circuit safety.

[0060] The main power control unit 221 is specifically a PWM signal generating unit, and the third control signal is specifically a pulse width modulation signal to control the conduction duty cycle of the first switch tube.

[0061] Figure 8 This is a circuit structure diagram of a constant current unit and a constant voltage unit provided in an embodiment of the present utility model.

[0062] Please refer to Figure 8 As a specific embodiment, the constant current unit 12 includes a first operational amplifier unit op1 and a constant current power tube M1. The inverting input terminal of the first operational amplifier unit op1 is connected to the output terminal of the current acquisition unit, and the non-inverting input terminal of the first operational amplifier unit op1 is connected to the first reference voltage Viref. The first operational amplifier unit op1 is used to output a first drive signal to the control terminal of the constant current power tube M1 according to the change of the difference between the first sampling voltage Vifb and the first reference voltage Viref; the second terminal of the constant current power tube M1 is coupled to the first terminal of the optocoupler regulation module 20, and the constant current power tube M1 is used to adjust the first output voltage V10 output by itself according to the first drive signal. The first output voltage V10 is output to the first terminal of the optocoupler regulation module 20.

[0063] The constant voltage unit 11 includes a second operational amplifier unit op2 and a constant voltage power tube M2. The inverting input terminal of the second operational amplifier unit op2 is connected to the output terminal of the voltage acquisition unit, and the non-inverting input terminal of the second operational amplifier unit op2 is connected to the second reference voltage Vvref. The second operational amplifier unit op2 is used to output a second drive signal to the control terminal of the constant voltage power tube M2 according to the change of the difference between the second sampling voltage Vvfb and the second reference voltage Vvref; the second terminal of the constant voltage power tube M2 is coupled to the first terminal of the optical coupling regulation module 20, and the constant voltage power tube M2 is used to adjust the second output voltage output by itself according to the second drive signal, and the second output voltage is output to the first terminal of the optical coupling regulation module 20.

[0064] Specifically, the constant current power tube M1 and the constant voltage power tube M2 both include NMOS tubes. For example, a 24V durable high-voltage NLDMOS, or a low-voltage NMOS tube. The specific device can be selected based on the actual output voltage VOUT of the AC / DC power supply module 2, and is not limited here. Of course, the constant current power tube M1 and the constant voltage power tube M2 can also include PMOS tubes. For example, a 24V durable high-voltage PLDMOS, or a low-voltage PMOS tube. It should be noted that if the first constant current power tube M1M1 and the first constant voltage power tube M2M2 are PMOS tubes, it is necessary to adaptively adjust the specific ports of the first sampling voltage Vifb and the first reference voltage Viref input to the first operational amplifier unit op1. Similarly, it is also necessary to adaptively adjust the specific ports of the second sampling voltage Vvfb and the second reference voltage Vvref input to the second operational amplifier unit op2.

[0065] Please refer to Figure 7 and Figure 8 The following is an example of the constant current mode and constant voltage mode of the output regulation loop 1, and assumes that the first constant current power tube M1M1 and the first constant voltage power tube M2M2 are both NMOS tubes:

[0066] If the first sampling voltage Vifb is less than the first reference voltage Viref, the output regulation loop 1 enters a constant voltage mode to maintain the output voltage VOUT of the AC / DC power module 2 at a second set value. Specifically:

[0067] If the output voltage VOUT of the AC / DC power module 2 is greater than the second set value, then the second sampled voltage Vvfb obtained by the voltage sampling unit 1413 from the output voltage VOUT is greater than the first reference voltage Viref, and the second operational amplifier outputs a high level to turn on the first constant-voltage power transistors M2 and M3, thereby increasing the current flowing through the optocoupler diode. The increased current flowing through the optocoupler diode increases the light intensity, thereby increasing the light intensity received by the optocoupler transistor and increasing the current generated by the optocoupler diode. The increase in current generated by the optocoupler transistor will raise the voltage received by the main power supply unit, change the width of the PWM control signal output by the main power supply unit, control the on-off frequency of the first switch tube M3, reduce the duty cycle of the primary input voltage of the AC / DC power supply module 2, and thereby reduce the output voltage VOUT of the AC / DC power supply module 2. If the output voltage VOUT of the AC / DC power supply module 2 is lower than the second set voltage value, the above-mentioned reverse working process is performed to increase the output voltage VOUT of the AC / DC power supply module 2, and ultimately maintain the output voltage VOUT of the AC / DC power supply module 2 at the second set value.

[0068] If the first sampling voltage Vifb is greater than or equal to the first reference voltage Viref, the output regulation loop 1 enters a constant current mode to maintain the output current of the AC / DC power module 2 at a first set value. Specifically:

[0069] Because the first sampling voltage Vifb is greater than or equal to the first reference voltage Viref, the first operational amplifier outputs a high level, turning on the first constant-current power transistors M1 and M2, increasing the current flowing through the optocoupler diode. The increased current flowing through the optocoupler diode increases the light intensity, which in turn increases the light intensity received by the optocoupler transistor and the current it generates. The increased current generated by the optocoupler transistor raises the voltage received by the main power supply unit, changes the width of the PWM control signal output by the main power supply unit, controls the on-off frequency of the first switch M3, reduces the duty cycle of the primary input voltage of the AC / DC power supply module 2, and thereby reduces the output voltage VOUT and output current of the AC / DC power supply module 2, ultimately maintaining the output current of the AC / DC power supply module 2 at the first set value.

[0070] Of course, the first set value and the second set value can be set according to needs and are not limited here.

[0071] In summary, the constant current and constant voltage regulation system provided by the technical solution of the present invention is different from the prior art. The constant voltage unit and the constant current unit in the technical solution of the present invention can share a compensation module for loop compensation, and the constant current and constant voltage regulation chip only needs to be set with one compensation pin, which reduces the number of compensation devices and the number of chip pins, thereby improving the integration of the constant current and constant voltage regulation system.

[0072] Furthermore, connecting the binding wires of the output end of the AC / DC power module to the EPAD pins of the constant current and constant voltage regulation chip package can reduce the length of the binding wires and reduce the resistance of the binding wires, thereby improving power transmission efficiency.

[0073] The technical solution of the utility model also provides a new AC / DC power supply module architecture for powering the device to be charged.

[0074] in, Figure 9 This is a structural diagram of the AC / DC power module architecture provided by the technical solution of this utility model.

[0075] Please refer to Figure 9The AC / DC power module 1 architecture provided by the technical solution of the present invention includes: an AC / DC power module 1, the constant current and constant voltage regulation system 2 provided by the technical solution of the present invention, and a USB interface 3; the input pin of the constant current and constant voltage regulation chip is coupled to the output end of the AC / DC power module 1, the output end of the optocoupler regulation module is coupled to the input end of the AC / DC power module 1, the constant current and constant voltage regulation system 2 is used to maintain the output current of the AC / DC power module 1 at a first set value, and maintain the output voltage of the AC / DC power module 1 at a second set value; the output pin of the constant current and constant voltage regulation system 2 is coupled to the USB interface 3; the USB interface 3 is used to insert the device to be charged.

[0076] The technical solution of the present utility model also provides an electronic device, comprising the AC / DC power supply module architecture.

[0077] Although the present invention is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims

1. A constant current and constant voltage regulation system for performing constant current regulation on the output current of an AC / DC power module and constant voltage regulation on the output voltage of an AC / DC power module, characterized in that: include: Constant current and constant voltage regulation chip, compensation module and optocoupler regulation module; The constant current and constant voltage regulation chip includes: a constant voltage unit, a constant current unit, a first switch unit, a comparison control unit, a current sampling unit, and a voltage sampling unit; the input pin of the constant current and constant voltage regulation chip is connected to the output end of the AC / DC power supply module; the current sampling unit is used to sample the output current of the AC / DC power supply module to obtain a first sampling voltage and output it; the voltage sampling unit is used to sample the output voltage of the AC / DC power supply module to obtain a second sampling voltage and output it; the first end of the first switch unit is connected to the output end of the current sampling unit, the second end of the first switch unit is connected to the output end of the voltage sampling unit, and the third end of the first switch unit serves as the constant current and constant voltage a compensation pin of the regulating chip; the comparison control unit is used to compare the first sampling voltage and the second sampling voltage, and output a first control signal to the control end of the first switching unit according to the comparison result, so as to control the third end of the first switching unit to be connected to the first end of the first switching unit or the second end of the first switching unit; the constant current unit is used to amplify and output a first output voltage according to the difference between the first sampling voltage and the first reference voltage, and the constant voltage unit is used to amplify and output a second output voltage according to the difference between the second sampling voltage and the second reference voltage, and the output end of the constant current unit is connected to the output end of the constant voltage unit and serves as the optocoupler adjustment pin of the constant current and constant voltage regulating chip; The first end of the compensation module is connected to the optocoupler adjustment pin of the constant current and constant voltage regulation chip, and the second end of the compensation module is connected to the compensation pin of the constant current and constant voltage regulation chip. The compensation module is used to perform loop compensation on the constant voltage unit or the constant current unit; The optocoupler regulation module is used to maintain the output current of the AC / DC power supply module at a first set value based on the output voltage of the AC / DC power supply module and the first output voltage; the optocoupler regulation module is also used to maintain the output voltage of the AC / DC power supply module at a second set value based on the output voltage of the AC / DC power supply module and the second output voltage.

2. The constant current and constant voltage regulation system according to claim 1, characterized in that: The compensation module includes a compensation resistor and a compensation capacitor, the first end of the compensation resistor is connected to the optocoupler adjustment pin of the constant current and constant voltage regulation chip, the second end of the compensation resistor is connected to the first end of the compensation capacitor, and the second end of the compensation capacitor is connected to the compensation pin of the constant current and constant voltage regulation chip.

3. The constant current and constant voltage regulation system according to claim 1, characterized in that: The constant current unit includes a first operational amplifier unit and a constant current power tube, the first input end of the first operational amplifier unit is connected to the output end of the current acquisition unit, and the second input end of the first operational amplifier unit is connected to the first reference voltage. The first operational amplifier unit is used to output a first drive signal to the control end of the constant current power tube according to the change of the difference between the first sampling voltage and the first reference voltage; the second end of the constant current power tube is coupled to the first end of the optocoupler regulation module, and the constant current power tube is used to adjust the first output voltage output by itself according to the first drive signal, and the first output voltage is output to the first end of the optocoupler regulation module.

4. The constant current and constant voltage regulation system according to claim 3, characterized in that: The constant voltage unit includes a second operational amplifier unit and a constant voltage power tube. The first input end of the second operational amplifier unit is connected to the output end of the voltage acquisition unit, and the second input end of the second operational amplifier unit is connected to the second reference voltage. The second operational amplifier unit is used to output a second drive signal to the control end of the constant voltage power tube according to the change of the difference between the second sampling voltage and the second reference voltage; the second end of the constant voltage power tube is coupled to the first end of the optocoupler regulation module, and the constant voltage power tube is used to adjust the second output voltage output by itself according to the second drive signal, and the second output voltage is output to the first end of the optocoupler regulation module.

5. The constant current and constant voltage regulation system according to claim 4, characterized in that: The constant current power tube and the constant voltage power tube both include NMOS tubes.

6. The constant current and constant voltage regulation system according to claim 1, characterized in that: The input pin of the constant current and constant voltage regulation chip is specifically the EPAD pin.

7. The constant current and constant voltage regulation system according to claim 1, characterized in that: The constant current and constant voltage regulation chip also includes a power tube, an internal power supply module, a power drive module, a logic control module and a protocol module; the internal power supply module is used to provide a power supply voltage for the internal modules of the constant current and constant voltage regulation chip; the protocol module is used to detect the insertion of the device to be charged, and detect and output the target voltage and target current of the device to be charged, and the protocol module is also used to output a first enable signal to the logic control module according to the insertion of the device to be charged; The logic control module is used to output a second control signal to the power driving module according to the first enable signal; the power driving module is used to output a third drive signal to the control end of the power tube according to the second control signal; the first end of the power tube is connected to the input pin of the constant current and constant voltage regulation chip, and the second end of the power tube is connected to the output pin of the constant current and constant voltage regulation chip. The power tube is used to control its own conduction and shutdown according to the third drive signal.

8. The constant current and constant voltage regulation system according to claim 1, characterized in that: The optical coupling adjustment module includes a first optical coupling adjustment sub-unit and a second optical coupling adjustment sub-unit; the first end of the first optical coupling adjustment sub-unit serves as the first end of the optical coupling adjustment module, and the second end of the first optical coupling adjustment sub-unit serves as the second end of the optical coupling adjustment module; The first optocoupler regulation subunit is used to regulate the first current flowing through itself according to the output voltage of the AC / DC power supply module and the first output voltage, and transmit the first current to the second optocoupler regulation subunit through optocoupler action; the first end and the second end of the second optocoupler regulation subunit are respectively coupled to the input end and the ground end of the AC / DC power supply module, and the second optocoupler regulation subunit is used to control the output voltage and output current of the AC / DC power supply module according to the first current.

9. The constant current and constant voltage regulation system according to claim 8, characterized in that: The first optocoupler adjustment subunit includes a first optocoupler resistor and an optocoupler diode; the first end of the first optocoupler resistor serves as the second end of the first optocoupler adjustment subunit, and the second end of the first optocoupler resistor is coupled to the positive electrode of the optocoupler diode; the negative electrode of the optocoupler diode serves as the first end of the first optocoupler adjustment subunit.

10. The constant current and constant voltage regulation system according to claim 8, characterized in that: The second optocoupler regulation subunit includes a first switching tube, a second optocoupler resistor, an optocoupler transistor and a main power control unit; the emitter of the optocoupler transistor is connected to the first end of the second optocoupler resistor and serves as the second end of the second optocoupler regulation subunit, and the collector of the optocoupler transistor is connected to the main power control unit; the second end of the second optocoupler resistor is connected to the first end of the first switching tube; the second end of the first switching tube serves as the first end of the second optocoupler regulation subunit, and the control end and the first end of the first switching tube are both connected to the main power control unit; the main power control unit is used to output a third control signal according to the first current input by the optocoupler transistor to control the conduction and shutdown of the first switching tube.

11. An AC / DC power module architecture for powering a device to be charged, characterized in that: It includes an AC / DC power supply module, a constant current and constant voltage regulation system according to any one of claims 1 to 10, and a USB interface; the input pin of the constant current and constant voltage regulation chip is coupled to the output end of the AC / DC power supply module, the output end of the optocoupler regulation module is coupled to the input end of the AC / DC power supply module, the constant current and constant voltage regulation system is used to maintain the output current of the AC / DC power supply module at a first set value, and maintain the output voltage of the AC / DC power supply module at a second set value; the output pin of the constant current and constant voltage regulation system is coupled to the USB interface; the USB interface is used to insert the device to be charged.

12. An electronic device, characterized in that: Includes the AC / DC power module architecture as claimed in claim 11.

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