Charging voltage regulation circuit and electronic equipment accessory
By working in concert with the control module of the charging voltage regulation circuit, the voltage regulation switch module, and the voltage conversion module, the voltage is adjusted according to the equipment requirements, which solves the problems of low efficiency and high temperature rise of traditional chargers under multi-port output, and realizes an efficient and low-cost charging solution.
Patent Information
- Application Number
- CN202423320077.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-12-31
AI Technical Summary
When traditional PD multi-port output chargers output different low voltages simultaneously from multiple ports, the buck converter circuit needs to withstand a large input-output voltage difference, which leads to increased energy loss, low efficiency, and high temperature rise under full load. Usually, it is necessary to improve the current conversion efficiency or increase the size of the charger, resulting in increased cost and size.
The charging voltage regulation circuit is adopted. Through the coordinated work of the control module, voltage regulation switch module and voltage conversion module, the current conversion output bus voltage is adjusted according to the needs of the device to be charged. The output of the voltage conversion module is adjusted by the optocoupler module and PWM controller. Combined with multiple step-down modules, the set voltage is further reduced to the final voltage required by each device.
It significantly reduces the operating voltage drop of the buck converter circuit, improves charging efficiency, reduces energy loss and temperature rise, and at the same time does not increase the size or cost of the charger, ensuring high performance and a good user experience.
Smart Images
Figure CN223809600U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mobile power supply technical field especially, relate to a kind of charging voltage regulating circuit and electronic equipment accessories. BACKGROUND
[0002] The traditional PD multi-port output charger design mostly adopts single fixed voltage step-down converter step-down mode, that is, the output bus voltage after current conversion is a fixed high value (for example, 22V), and then the high voltage is reduced to the lower voltage required by the device (such as 5V, 9V, 12V, 15V, 20V or 21V) by the step-down converter circuit.
[0003] However, this design scheme has obvious shortcomings: when multiple ports output different low voltages at the same time, the step-down converter circuit needs to withstand a large input-output voltage difference, resulting in increased energy loss, low efficiency, and high temperature rise under full load. In order to solve the problems of efficiency and temperature rise, it is usually necessary to improve the efficiency of current conversion or increase the volume of the charger, resulting in increased cost and size of the charger. SUMMARY
[0004] The utility model aims to at least solve one of the technical problems existing in the prior art, provide a charging voltage regulating circuit and electronic equipment accessories, which can perform multi-stage voltage regulation to solve the problems of efficiency and temperature rise.
[0005] In the first aspect, the utility model embodiment provides a charging voltage regulating circuit, which comprises: a control module connected with one or more electrical transmission interfaces; a voltage regulating switch module connected with the control module; a voltage conversion module connected with the voltage regulating switch module at one end and connected with a voltage output end at the other end; one or more step-down modules, the input end of each step-down module is connected with the voltage output end; each electrical transmission interface is connected with the output end of at least one step-down module; wherein, when one or more devices to be charged are connected with the electrical transmission interface, the control module is used to send a control signal to the voltage regulating switch module to adjust the current flowing to the voltage conversion module, so that the voltage conversion module outputs a set voltage based on the current, and the step-down module steps down the set voltage to output a voltage regulating voltage to the electrical transmission interface.
[0006] In some embodiments, an optocoupler module is provided between the voltage regulating switch module and the voltage conversion module, and the voltage regulating switch module is used to adjust the current input to the optocoupler module, so that the voltage conversion module outputs the set voltage based on the corresponding optocoupler resistance value of the optocoupler module.
[0007] In some embodiments, the optocoupler module comprises: a light-emitting diode connected to the voltage regulating switch module; a light-dependent triode having one end connected to the voltage conversion module and the other end grounded; wherein the light-emitting diode is configured to emit light based on the current input by the voltage regulating switch module to change the optocoupler resistance of the light-dependent triode.
[0008] In some embodiments, the voltage regulating switch module comprises: a first voltage dividing resistor and a second voltage dividing resistor connected in series, the first voltage dividing resistor connected to the voltage output terminal, and the second voltage dividing resistor grounded; a comparator having input terminals connected to the two ends of the second voltage dividing resistor and an output terminal connected to the voltage conversion module; wherein the second voltage dividing resistor is connected in parallel with one or more switch tube resistance branches, the control terminals of the switch tube resistance branches configured to switch between on and off states based on the level signal to adjust the current flowing to the voltage conversion module.
[0009] In some embodiments, the switch tube resistance branch comprises a branch resistor and a switch tube connected in series, the control terminal of the switch tube connected to the level signal output terminal of the control module.
[0010] In some embodiments, the switch tube resistance branch comprises a first branch and a second branch, the first branch comprising a first branch resistor and a first switch tube, and the second branch comprising a second branch resistor and a second switch tube; wherein when the first switch tube and the second switch tube are open, the set voltage is a first voltage segment; when the first switch tube is closed and the second switch tube is open, the set voltage is a second voltage segment, the second voltage segment being greater than the first voltage segment; and when the first switch tube and the second switch tube are closed, the set voltage is a third voltage segment, the third voltage segment being greater than the second voltage segment.
[0011] In some embodiments, the number of voltage conversion modules is the same as the number of electrical transmission interfaces, and each voltage conversion module is connected to a corresponding electrical transmission interface.
[0012] In some embodiments, the voltage conversion module comprises a PWM controller and a transformer, one end of the PWM controller connected to the voltage regulating switch module and the other end connected to the primary side of the transformer, the secondary side of the transformer connected to the voltage output terminal through a rectifier diode; wherein the PWM controller is configured to adjust the duty cycle of the output signal output to the primary side of the transformer based on the pin current corresponding to the optocoupler resistance.
[0013] In some embodiments, the control module is communicatively connected to the device to be charged through the electrical transmission interface, and is configured to select a pre-stored voltage gear based on the voltage request of the device to be charged and send the level signal corresponding to the voltage gear.
[0014] In some embodiments, the output ends of the plurality of voltage reduction modules are respectively connected to the voltage ends of the electric transmission interface through switch tubes.
[0015] In a second aspect, the utility model discloses a kind of electronic equipment accessories, including the charging voltage regulation circuit as described in any one of the first aspect.
[0016] According to the charging voltage regulation circuit and electronic equipment accessory provided by the embodiments of the utility model, at least have following beneficial effects: the charging voltage regulation circuit in the embodiments of the utility model realizes the function of adjusting current conversion output bus voltage according to the demand of connecting device by introducing control module and the cooperative work of voltage conversion module and voltage regulation switch module.Specifically, when the device to be charged is connected to the electric transmission interface, the control module will select appropriate voltage gear according to the communication result between the device, and send corresponding level signal to the voltage regulation switch module, and the voltage regulation switch module can adjust the current flowing to the voltage conversion module after receiving these signals, so that the voltage conversion module can output the set voltage suitable for the device;Further, the set voltage is further reduced to the final voltage required by each device by one or more voltage reduction modules, so that the working pressure difference of the voltage reduction converter circuit can be significantly reduced, the charging efficiency can be effectively improved, the energy loss and temperature rise can be reduced, and the volume or cost of the charger does not need to be increased, which not only guarantees the high performance of the product, but also maintains good user experience.
[0017] Other features and advantages of the present utility model will be set forth in the following description of the application, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present utility model. The objects and other advantages of the present utility model can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS
[0018] The accompanying drawings are included to provide a further understanding of the technical scheme of the present utility model, and constitute a part of the specification, and are used together with the embodiments of the present utility model to explain the technical scheme of the present utility model, and do not constitute a limitation on the technical scheme of the present utility model.
[0019] The present utility model will be further described below in combination with the drawings and embodiments;
[0020] Figure 1 It is a structure schematic view of the charging voltage regulation circuit provided by the embodiments of the present utility model;
[0021] Figure 2 It is an optional specific structure schematic view of the voltage regulation switch module in the charging voltage regulation circuit provided by the embodiments of the present utility model;
[0022] Figure 3The utility model discloses a kind of charging voltage regulating circuit, the structural schematic diagram of voltage conversion module.
[0023] Reference signs:
[0024] 110, control module; 111, first interface; 112, second interface; 120, voltage regulating switch module; 130, voltage conversion module; 140, first voltage reduction module; 150, second voltage reduction module. DETAILED DESCRIPTION
[0025] This part will describe the specific embodiment of the utility model in detail, and the preferred embodiment of the utility model is shown in the drawing, and the drawing is used to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.
[0026] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, "any one" means one or more, "at least one of the following" and similar expressions mean any combination of these items, including any combination of single or multiple items. If the first, second is described, it is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of indicated technical features.
[0027] It should be noted that the words such as setting, installing and connecting in the embodiments of the utility model should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the embodiments of the utility model according to the specific content of the technical scheme. For example, the term "connection" can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through intermediate medium.
[0028] It should be noted that the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict between them.
[0029] The traditional PD multi-port output charger design mostly adopts a single fixed voltage step-down converter step-down mode, that is, the output bus voltage after current conversion is a fixed high value (for example, 22V), and then the high voltage is reduced to a lower voltage (for example, 5V, 9V, 12V, 15V, 20V or 21V) required by the device through a step-down converter circuit. However, this design scheme has obvious disadvantages: when multiple ports output different low voltages at the same time, the step-down converter circuit needs to bear a large input-output voltage difference, resulting in increased energy loss, low efficiency, and high temperature rise under full load. In order to solve the problems of efficiency and temperature rise, the efficiency of current conversion or the size of the charger needs to be improved, resulting in increased cost and size of the charger.
[0030] Based on this, the purpose of the utility model is to at least solve one of the technical problems existing in the prior art, provide a charging voltage regulation circuit and electronic equipment accessories, which can perform multi-stage voltage regulation to solve the problems of efficiency and temperature rise.
[0031] The embodiments of the present application will be further described below with reference to the drawings.
[0032] Reference Figure 1 , Figure 1 is a structural schematic diagram of a charging voltage regulation circuit provided by the utility model embodiment; in the first aspect, the utility model embodiment provides a charging voltage regulation circuit, which comprises: a control module 110 connected with one or more electric transmission interfaces; a voltage regulation switch module 120 connected with one end of the control module 110; a voltage conversion module 130 connected with one end of the voltage regulation switch module 120 and the other end of the voltage output end; one or more step-down modules, the input ends of which are connected with the voltage output end respectively; each electric transmission interface is connected with the output end of at least one step-down module; wherein when one or more devices to be charged are connected with the electric transmission interface, the control module 110 is used for sending a control signal to the voltage regulation switch module 120, so that the voltage regulation switch module 120 adjusts the current flowing to the voltage conversion module 130, so that the voltage conversion module 130 outputs a set voltage based on the current, and the step-down module steps down the set voltage to output a regulated voltage to the electric transmission interface.
[0033] It can be understood that the charging voltage regulation circuit in the utility model embodiment realizes the function of adjusting the output bus voltage of current conversion according to the requirements of the connected device by introducing the cooperative work of the control module 110, the voltage regulation switch module 120 and the voltage conversion module 130.
[0034] In some embodiments, a photocoupler module U3 is arranged between the voltage regulating switch module 120 and the voltage conversion module 130, the voltage regulating switch module 120 is used to adjust the current input to the photocoupler module U3, so that the voltage conversion module 130 outputs a set voltage based on the corresponding photocoupler resistance value of the photocoupler module U3, and the control signal includes a level signal; wherein when the device to be charged is connected to the electrical transmission interface, the control module 110 selects an appropriate voltage level according to the communication result with the device, and sends a corresponding level signal to the voltage regulating switch module 120, and after the voltage regulating switch module 120 receives the signal, the current input to the photocoupler module can be adjusted, so that the conduction degree of the photocoupler is changed, so that the voltage conversion module 130 can output an appropriate set voltage; further, the set voltage is further reduced to the final voltage required by each device through one or more voltage reduction modules, so that the working voltage difference of the voltage reduction converter circuit can be significantly reduced, the charging efficiency can be effectively improved, and the energy loss and temperature rise can be reduced, without increasing the size or cost of the charger, which not only ensures the high performance of the product, but also maintains good user experience.
[0035] In some embodiments, the control module 110 includes an MCU chip, the MCU (Microcontroller Unit) chip is connected with one or more electrical transmission interfaces (such as Type-C interface) through a built-in software program, used to receive voltage request information from the device to be charged, and select a pre-stored voltage level according to the information, then the control module 110 generates a corresponding level signal and sends it to the voltage regulating switch module 120 to adjust the output voltage.
[0036] Reference Figure 2 , Figure 2 is a kind of optional specific structure schematic diagram of voltage regulating switch module 120 in the charging voltage regulating circuit provided by the embodiment of the utility model, as shown in Figure 2 Comparator U1 input end is connected to the two ends of second voltage dividing resistor R2 respectively, output end is connected to light emitting diode, first voltage dividing resistor R1 and second voltage dividing resistor R2 are connected in series to form voltage dividing network, wherein first voltage dividing resistor R1 is connected to voltage output end Vout, second voltage dividing resistor R2 is grounded, first switch tube Q1 and second switch tube Q2 are connected in parallel on second voltage dividing resistor R2, to adjust the current flowing to voltage conversion module;Specifically, the control end of each switch tube is connected with control module 110 through branch resistor (R4 and R5), and the on-off state is controlled by receiving level signal, to adjust the current flowing through light emitting diode.
[0037] In some embodiments, the optocoupler module comprises: a light-emitting diode connected to the voltage regulating switch module 120; and a photo triode having one end connected to the voltage conversion module 130 and the other end grounded; wherein the light-emitting diode is configured to emit light based on the current input from the voltage regulating switch module 120 to change the optocoupling resistance of the photo triode; specifically, as shown in Figure 2 the input end of the light-emitting diode of the optocoupler module is connected to the voltage output end Vout through an input resistor R3.
[0038] The optocoupler module is configured to convert an electrical signal into an optical signal and then convert the optical signal back into an electrical signal to transmit information while maintaining electrical isolation. The optocoupler module is composed of a light-emitting diode (LED) and a photo triode. The light-emitting diode is connected to the output end of the comparator in the voltage regulating switch module 120 to receive the current output from the comparator and emit light based on the current intensity. One end of the photo triode is connected to the voltage conversion module 130, and the other end is grounded. It can be understood that the conduction degree of the photo triode changes after receiving the light emitted by the light-emitting diode, thereby changing its own resistance (i.e., the optocoupling resistance), which affects the output voltage of the voltage conversion module 130.
[0039] In some embodiments, the voltage regulating switch module 120 comprises: a first voltage dividing resistor and a second voltage dividing resistor connected in series, the first voltage dividing resistor connected to the voltage output end, and the second voltage dividing resistor grounded; and a comparator having its input ends connected to the two ends of the second voltage dividing resistor and its output end connected to the light-emitting diode; wherein the second voltage dividing resistor is connected in parallel with one or more switch tube resistance branches, and the control end of the switch tube resistance branch is configured to switch between on and off states based on the level signal to adjust the current input to the light-emitting diode.
[0040] It can be understood that the voltage regulating switch module 120 is composed of a voltage dividing resistor network and a comparator. The voltage dividing resistor network includes a first voltage dividing resistor and a second voltage dividing resistor connected in series, with the first voltage dividing resistor connected to the voltage output end and the second voltage dividing resistor grounded. In addition, the second voltage dividing resistor is connected in parallel with one or more switch tube resistance branches, each branch composed of a branch resistor and a switch tube (such as a MOSFET transistor) connected in series. The control end of the switch tube is connected to the level signal output end of the control module 110 and can switch between on and off states based on the level signal output by the MCU, thereby changing the current flowing through the light-emitting diode and ultimately affecting the working state of the optocoupler module.
[0041] It is worth mentioning that in the circuit, resistors R1 and R2 form a voltage divider network, and Vout is divided and sent to the inverting input terminal of U1. In this way, U1 actually compares the voltage after voltage division with the internal reference voltage. If the divided Vout is higher than Vref, the output of U1 will decrease; otherwise, if the divided Vout is lower than Vref, the output of U1 will increase. This output change will affect the subsequent optocoupler U3 and PWM controller U2, thereby adjusting Vout.
[0042] In some embodiments, the switch tube resistance branch includes a branch resistance and a switch tube in series, and a control end of the switch tube is connected with a level signal output end of the control module 110.
[0043] In some embodiments, the switch tube resistance branch includes a first branch and a second branch, the first branch includes a first branch resistance and a first switch tube, and the second branch includes a second branch resistance and a second switch tube; wherein, when the first switch tube and the second switch tube are open, the set voltage is a first voltage segment; when the first switch tube is closed and the second switch tube is open, the set voltage is a second voltage segment, and the second voltage segment is greater than the first voltage segment; when the first switch tube and the second switch tube are closed, the set voltage is a third voltage segment, and the third voltage segment is greater than the second voltage segment.
[0044] It can be understood that the voltage regulating switch module 120 includes two groups of switch tube resistance branches: a first branch and a second branch, each branch is composed of a branch resistance and a switch tube, when the first switch tube and the second switch tube are both in an open state, the set voltage is a first voltage segment; when only the first switch tube is closed and the second switch tube is open, the set voltage is a second voltage segment, and the voltage is greater than the first voltage segment; when the first switch tube and the second switch tube are both closed, the set voltage is a third voltage segment, and the voltage is greater than the second voltage segment. This design allows the system to flexibly adjust the bus voltage according to different needs to optimize the efficiency of the DC BUCK step-down circuit.
[0045] In some embodiments, the number of voltage reduction modules is the same as that of the electrical transmission interfaces, and each voltage reduction module is connected with a corresponding electrical transmission interface; specifically, the corresponding Figures 1 to 2 , the electrical transmission interface can include a first interface 111 and a second interface 112, and the voltage reduction module includes a first voltage reduction module 140 and a second voltage reduction module 150, the output end of the first voltage reduction module 140 is connected with the first interface 111, and the output end of the second voltage reduction module 150 is connected with the first interface 112.
[0046] Reference Figure 3 , Figure 3 is a structure diagram of a voltage conversion module 130 in a charging voltage regulating circuit provided by the embodiment of the utility model; as Figure 3As shown, the PWM controller U2 is connected to the photo-sensitive triode in the optocoupler module at one end and to the primary side of the transformer T1 at the other end. The primary side of the transformer T1 receives the driving signal from the PWM controller U2, and the secondary side outputs a set voltage Vout after rectification by the rectifier diode D1. The output ends of the multiple step-down modules are connected to the voltage ends of the electrical transmission interfaces through the switching tubes, for further reducing the set voltage Vout to the final voltage required by each corresponding electrical transmission interface.
[0047] In some embodiments, the corresponding Figure 3 The electrical transmission interface includes a first interface 111 and a second interface 112, and the step-down module includes a first step-down module 140 and a second step-down module 150. The input end of the first step-down module 140 is connected to the voltage output end Vout of the voltage conversion module 130, and its output end VoutA is connected to the first interface 111 through the third switching tube Q3. The input end of the second step-down module 150 is also connected to the voltage output end Vout of the voltage conversion module 130, and its output end VoutB is connected to the first interface 112 through the fourth switching tube Q4.
[0048] It can be understood that after receiving the voltage request from the first interface 111 or the first interface 112, the control module 110 selects the appropriate voltage gear and sends the level signal to the voltage regulating switch module 120. The first switching tube Q1 and the second switching tube Q2 in the voltage regulating switch module 120 adjust their on-off states according to the level signal, thereby changing the current flowing through the light-emitting diode. The photo-sensitive triode in the optocoupler module adjusts its conduction degree according to the luminous intensity of the light-emitting diode, affecting the working state of the voltage conversion module 130. The PWM controller U2 in the voltage conversion module 130 adjusts the pulse width modulation signal output to the transformer T1 according to the feedback of the optocoupler module, finally outputs the set voltage Vout. The first step-down module 140 and the second step-down module 150 further reduce the set voltage to the final voltage required by each corresponding electrical transmission interface, and output the final voltage to the corresponding electrical transmission interface through the third switching tube Q3 and the fourth switching tube Q4.
[0049] In some embodiments, the primary side of the transformer T1 is further provided with a primary side switch tube D2 and a resistor R8, and is connected to a power supply VCC. The first switch tube Q1 is a MOS tube provided with an internal parasitic resistor R6. The second switch tube Q2 is also a MOS tube provided with an internal parasitic resistor R7. The D2 is used to control the current flowing through the primary side of the transformer T1, and is an actual execution element of the output signal of the PWM controller U2. The D2 is periodically turned on and turned off under the drive of the PWM controller U2, thereby controlling the energy storage process of the primary side of the transformer T1. When the D2 is turned on, the current flows through the primary side coil of the transformer T1 to store energy. When the D2 is turned off, the stored energy is released to the load through the secondary side coil. The on-time (i.e. duty cycle) of the D2 is controlled by the PWM controller to control the voltage output of the secondary side of the transformer T1. The resistor R8 is connected to the output end of the PWM controller U2, and can be used to limit the current flowing into the gate of the switch tube D2, thereby preventing the switch tube from being damaged due to the excessively high gate voltage.
[0050] In some embodiments, the voltage conversion module 130 includes a PWM controller and a transformer. One end of the PWM controller is connected to the optocoupler module, and the other end is connected to the primary side of the transformer. The secondary side of the transformer is connected to the voltage output end through a rectifier diode. The PWM controller is used to adjust the duty cycle of the output signal output to the primary side of the transformer based on the pin current corresponding to the optocoupler resistance value.
[0051] It can be understood that the voltage conversion module 130 is responsible for adjusting the higher voltage after current conversion to a set voltage suitable for subsequent voltage reduction module processing. The voltage conversion module 130 includes two main components: a PWM controller and a transformer. The PWM controller is connected to the optocoupler module, and adjusts the duty cycle of the pulse width modulation (PWM) signal output to the primary side of the transformer according to the feedback provided by the optocoupler module (i.e. the pin current corresponding to the optocoupler resistance value). In this way, the PWM controller can accurately control the energy storage of the primary side of the transformer, thereby adjusting the output voltage Vout of the secondary side. The primary side of the transformer is connected to the PWM controller and accepts the PWM signal for driving. The secondary side is connected to the voltage output end through a rectifier diode, and provides the adjusted set voltage to the voltage reduction module.
[0052] In some embodiments, the voltage reduction module is a DC BUCK circuit, which is used to further reduce the set voltage output by the voltage conversion module 130 to the final voltage required by each electrical transmission interface. The input end of each voltage reduction module is connected to the voltage output end, and the output end is connected to one or more electrical transmission interfaces (such as Type-C interface). Specifically, the output end of the first voltage reduction module 140 is connected to the voltage end of the first interface 111 through a third switch tube, and the output end of the second voltage reduction module 150 is connected to the voltage end of the first interface 112 through a fourth switch tube. In this way, even in the case of multiple devices requesting different voltages at the same time, each voltage reduction module can independently provide accurate voltage regulation voltage for the corresponding device.
[0053] In some embodiments, the output end of the first voltage reduction module 140 is connected to the voltage end of the first interface 111 through a third switch tube, and the output end of the second voltage reduction module 150 is connected to the voltage end of the first interface 112 through a fourth switch tube. The first interface 111 and the first interface 112 are both Type-C interfaces. In this embodiment, the electrical transmission interface refers to a physical interface directly connected to an external device to be charged, and specifically refers to a Type-C interface. Each interface is equipped with a communication line (such as CC1, CC2 / DP, DM) for establishing handshake communication with the control module 110, so that the MCU can identify the needs of the connected device and provide the correct voltage. For example, the first interface 111 and the first interface 112 correspond to the first voltage reduction module 140 and the second voltage reduction module 150 respectively, ensuring the independence and compatibility between devices during multi-port charging.
[0054] In some embodiments, the control module is in communication connection with the device to be charged through the electrical transmission interface, and is used to select a pre-stored voltage gear based on the voltage request of the device to be charged, and send a voltage level signal corresponding to the voltage gear. The specific signal setting can include the following embodiments:
[0055] In some embodiments, the first voltage is 10V, and in single-port state: when any one device is connected, the device establishes handshake communication with the MCU protocol chip through CC1, CC2 / DP, DM, and MCU, and sends a voltage request of 5V or 9V; the MCU selects the pre-stored 5V or 9V gear program according to the request of the device, and identifies the 5V or 9V gear; the MCU keeps GPIO0 and GPIO1 connected with Q1 and Q2 at low level state, and Q1 and Q2 are cut off; after U1 is divided by R1 and R2, the internal comparator detects a lower voltage value, at this time, U1 presents a low resistance state, the input end of U3 optocoupler light emitting diode current increases, and the light intensity increases; the light-sensitive triode of the optocoupler is turned on to a deeper degree, the FB pin current of U2 increases, and the current flowing to the PWM controller also increases; the PWM controller adjusts the duty cycle of the pulse output according to the current change, reduces the duty cycle, shortens the conduction time of the switching tube D2, reduces the primary energy storage of T1 transformer, and reduces the output voltage of the secondary side; after D1 rectifier diode is rectified, the Vout voltage is reduced to the set 10V, and then the 10V voltage is stepped down to 5V or 9V output voltage through the first step-down module or the second step-down module, and finally output to the Type-C port through VOUTA / VOUTB and Q3 / Q4 to provide for the connected device.
[0056] In multi-port state: assuming that two Type-C interface devices are connected at the same time and request 5V and 9V voltage respectively; the MCU selects the 10V bus voltage according to the request of the device, and controls the first step-down module and the second step-down module to provide 5V and 9V output for the two devices respectively; the GPIO0 and GPIO1 of the MCU keep low level state, and Q1 and Q2 are cut off; after U1 is divided by R1 and R2, the internal comparator detects a lower voltage value, at this time, U1 presents a low resistance state, the input end of U3 optocoupler light emitting diode current increases, and the light intensity increases; the light-sensitive triode of the optocoupler is turned on to a deeper degree, the FB pin current of U2 increases, and the current flowing to the PWM controller also increases; the PWM controller adjusts the duty cycle of the pulse output according to the current change, reduces the duty cycle, shortens the conduction time of the switching tube D2, reduces the primary energy storage of T1 transformer, and reduces the output voltage of the secondary side; after D1 rectifier diode is rectified, the Vout voltage is reduced to the set 10V, and then the 10V voltage is stepped down to 5V and 9V output voltage through the first step-down module and the second step-down module respectively, and finally output to the Type-C port through VOUTA and VOUTB and Q3 and Q4 to provide for the connected device.
[0057] In some embodiments, the second section voltage is 16V, and in single-port state: when any one Type-C interface device is connected, the device establishes handshake communication with the MCU protocol chip through CC1, CC2 / DP, DM, and MCU, and sends a voltage request of 12V or 15V; the MCU selects a pre-stored 12V or 15V gear program according to the request of the device, and identifies the 12V or 15V gear; the GPIO1 output of the MCU drives Q1 with a high-level signal delayed for 50ms, and Q1 is turned on. The MOSG high-level conduction of Q1 connects R4 and R2 in parallel, and pulls down the detection voltage of U1; after U1 is divided by R1, R2 and R4, the internal comparator detects a higher voltage value, at this time, U1 presents a high resistance state, so that the input end of the light emitting diode current of the U3 optocoupler decreases, and the light intensity decreases; the light-sensitive triode of the optocoupler is turned on to a smaller extent, the FB pin current of U2 decreases, and the current flowing to the PWM controller also decreases; the PWM controller adjusts the duty cycle of the pulse output according to the current change, increases the duty cycle, lengthens the conduction time of the switching tube D2, increases the primary energy storage of the T1 transformer, and increases the output voltage of the secondary side; after the rectification of the D1 rectifier diode, the Vout voltage rises to the set 16V. Subsequently, the 16V voltage is stepped down to 12V or 15V output voltage through the first step-down module or the second step-down module, and finally output to the Type-C port through VOUTA / VOUTB and Q3 / Q4 to provide power to the connected device.
[0058] In multi-port state: assuming that two Type-C interface devices are connected at the same time and request 12V and 15V voltage respectively; the MCU selects a 16V bus voltage according to the request of the device, and controls the first step-down module and the second step-down module to provide 12V and 15V output for the two devices respectively; the GPIO1 output of the MCU drives Q1 and Q2 MOS with a high-level signal delayed for 50ms, and Q1 and Q2 are turned on. The MOSG high-level conduction of Q1 connects R4 and R2 in parallel, and pulls down the detection voltage of U1; after U1 is divided by R1, R2 and R4, the internal comparator detects a higher voltage value, at this time, U1 presents a high resistance state, so that the input end of the light emitting diode current of the U3 optocoupler decreases, and the light intensity decreases; the light-sensitive triode of the optocoupler is turned on to a smaller extent, the FB pin current of U2 decreases, and the current flowing to the PWM controller also decreases; the PWM controller adjusts the duty cycle of the pulse output according to the current change, increases the duty cycle, lengthens the conduction time of the switching tube D2, increases the primary energy storage of the T1 transformer, and increases the output voltage of the secondary side; after the rectification of the D1 rectifier diode, the Vout voltage rises to the set 16V. Subsequently, the 16V voltage is stepped down to 12V and 15V output voltage respectively through the first step-down module and the second step-down module,
[0059] In some embodiments, the third segment voltage is 22V, when any one Type-C interface device is connected and requests 20V or 21V voltage, the device establishes handshake communication with the MCU protocol chip through CC1, CC2 / DP, DM; the MCU selects the pre-stored 20V or 21V gear program according to the request of the device, and identifies that it needs to enter the first segment voltage regulation mode; the GPIO1 and GPIO0 of the MCU output high level signal delayed for 50ms from the device communication, driving Q1 and Q2 MOSFET to turn on; after Q1 and Q2 turn on, R5, R4 and R2 are connected in parallel, reducing the total resistance value of the voltage division network. At this time, U1 compares the voltage division value of R1, R2, R4 and R5; because R5, R4 and R2 are connected in parallel, the voltage at the inverting input terminal of U1 is reduced, causing the internal comparator of U1 to present a high resistance state, which causes the current of the light emitting diode of the optocoupler U3 to decrease, and the light intensity to weaken; after the light-sensitive triode of the optocoupler U3 receives weak light, its conduction degree decreases, the current of the FB pin of U2 decreases, and the current flowing to the PWM controller also decreases; U2 adjusts the duty cycle of the pulse output according to the change of the FB pin current, increases the duty cycle, and lengthens the conduction time of the switching tube D2, so that the primary energy storage of the T1 transformer increases, and the output voltage of the secondary side increases; after the rectification of the D1 rectifier diode, the output voltage Vout rises to the set voltage value 22V of the first segment; the 22V Vout is stepped down to 20V or 21V output voltage through the first step-down module or 5, and finally output to the Type-C port through VOUTA / VOUTB and Q3 / Q4, providing power to the connected device.
[0060] Multi-port state: when two or more Type-C interface devices are connected at the same time, assuming that one of the devices requests 20V or 21V voltage, and the other device requests a lower voltage (such as 15V or 9V); the MCU selects the highest bus voltage 22V according to the voltage requests of all devices to meet the needs of 20V or 21V devices; the subsequent steps are the same as in the single-port state: the MCU outputs control signals to drive Q1 and Q2 to turn on, changes the voltage division network, U1 comparator acts, optocoupler feedback, PWM controller adjusts, and finally outputs 22V Vout; the 22V Vout passes through different DCBUCK step-down circuits to provide the required voltage (such as 20V, 21V, 15V or 9V) for each device.
[0061] In some embodiments,
[0062] The first segment voltage Vout = Vref x (R1 / R2+1);
[0063] The second segment voltage Vout = Vref x (R1 / R2||R3+1);
[0064] Three-stage voltage Vout=Vref x (R1 / R2||R3||R3A+1);
[0065] Wherein, Vref Vref is the reference voltage of the voltage stabilizer in U2, Vout is the voltage to be adjusted by segmentation, 1 is a constant, R2||R3 is the parallel resistance value of R2 and R3, R2||R3||R3A is R2, R3, R3 three resistors in parallel.
[0066] In some embodiments, the voltage regulation delay time of the control module can be: Vgio delaytime≥50mS Vcc1, Vcc2, Vdm1, Vpd1 time, and in the above voltage regulation delay time, Vgio delay time is the Vgio level delay time, and cc1, Vcc2, Vdm1, Vpd1 time is the communication time.
[0067] In the second aspect, the utility model embodiment provides a kind of electronic equipment accessories, including the charging voltage regulation circuit of any one in the first aspect, and electronic equipment accessories can include charger, mobile power, HUB, car charger, wireless charging and so on.
[0068] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by ordinary skilled in the art without departing from the purpose of the utility model.
Claims
1. A charge voltage regulating circuit, characterized by comprising: The application relates to a voltage regulating device. The voltage regulating device comprises: a control module connected with one or more electric transmission interfaces; a voltage regulating switch module connected with the control module; a voltage conversion module connected with one end of the voltage regulating switch module and the other end of the voltage output end; one or more voltage reduction modules, the input ends of which are connected with the voltage output end respectively; each electric transmission interface is connected with the output end of at least one voltage reduction module.
2. The charge voltage regulation circuit of claim 1, wherein, When one or more devices to be charged are connected with the electric transmission interface, the control module is used for sending a control signal to the voltage regulating switch module, so that the voltage regulating switch module adjusts the current flowing to the voltage conversion module, the voltage conversion module outputs a set voltage based on the current, and the voltage reduction module reduces the set voltage to output a voltage regulating voltage to the electric transmission interface.
3. The charge voltage regulation circuit of claim 1, wherein, An optical coupling module is arranged between the voltage regulating switch module and the voltage conversion module, and the voltage regulating switch module is used for adjusting the current input to the optical coupling module, so that the voltage conversion module outputs the set voltage based on the optical coupling resistance value corresponding to the optical coupling module. The voltage regulating switch module comprises: a first voltage dividing resistor and a second voltage dividing resistor connected in series, the first voltage dividing resistor being connected with the voltage output end, and the second voltage dividing resistor being grounded; a comparator, the input ends of which are connected with the two ends of the second voltage dividing resistor respectively, and the output end of which is connected with the voltage conversion module; 4. The charge voltage regulation circuit of claim 3, wherein, wherein the second voltage dividing resistor is connected in parallel with one or more switch tube resistance branches, the control end of the switch tube resistance branch being used for switching the on-off state based on the level signal of the control module to adjust the current flowing to the voltage conversion module.
5. The charge voltage regulation circuit of claim 4, wherein, The switch tube resistance branch comprises a branch resistor and a switch tube connected in series, and the control end of the switch tube is connected with the level signal output end of the control module. The switch tube resistance branch comprises a first branch and a second branch, the first branch comprises a first branch resistor and a first switch tube, and the second branch comprises a second branch resistor and a second switch tube; wherein when the first switch tube and the second switch tube are disconnected, the set voltage is a first voltage segment; when the first switch tube is closed and the second switch tube is disconnected, the set voltage is a second voltage segment, and the second voltage segment is greater than the first voltage segment; 6. The charge voltage regulation circuit of claim 1, wherein, when the first switch tube and the second switch tube are closed, the set voltage is a third voltage segment, and the third voltage segment is greater than the second voltage segment.
7. The charge voltage regulation circuit of claim 2, wherein, The number of the voltage reduction modules is the same as that of the electric transmission interfaces, and each voltage reduction module is connected with a corresponding electric transmission interface. The voltage conversion module comprises a PWM controller and a transformer, one end of the PWM controller is connected with the voltage regulating switch module, the other end of the PWM controller is connected with the primary side of the transformer, the secondary side of the transformer is connected with the voltage output end through a rectifier diode; wherein the PWM controller is used for adjusting the duty cycle of the output signal output to the primary side of the transformer based on the pin current corresponding to the optical coupling resistance value.
8. The charge voltage regulation circuit of claim 1, wherein, The control module is in communication connection with the device to be charged through the electric transmission interface, and is configured to select a pre-stored voltage gear based on a voltage request of the device to be charged, and send a level signal corresponding to the voltage gear.
9. The charge voltage regulation circuit of claim 6, wherein, Outputs of the plurality of voltage reduction modules are respectively connected to voltage ends of the electric transmission interface through switch tubes.
10. An electronic device accessory, characterized in that, A charging voltage regulation circuit comprising the charging voltage regulation circuit according to any one of claims 1 to 9.