Charging control circuit and charger

Abstract

The utility model discloses a charging control circuit and a charger. The charging control circuit uses InnoSwitch 4-Pro gallium nitride as a primary switch to carry out 65W fast charging design, the steady-state switching frequency of the charging control circuit can reach 140kHz, the size of a planar transformer is greatly reduced, the size and the weight of the whole charger product are reduced, the power density can reach 0.7 W / cm < 3 >, the battery of the charger baby of the applicable two-in-one charger product is a polymer lithium battery, and the battery sampling is convenient. The polymer battery has the advantages of high electric energy density, small volume, no memory effect or self-discharge phenomenon, and long service life.

Description

Technical Field

[0001] The utility model relates to the technical field of consumer electronics, in particular to a charging control circuit and a charger. Background Art

[0002] The power bank can store electrical energy in the internal battery and can charge the mobile phone at any time for energy replenishment. Similarly, the power bank also needs to be charged to store electrical energy. The traditional power bank needs to use a separate charger for charging. When forgetting to carry the charger, it cannot be charged through the mains power, affecting subsequent use.

[0003] The fast charging and power bank two-in-one product integrates a 65W fast charging and a 5000mAh power bank. It can not only directly fast charge the mobile phone, but also charge the integrated power bank. After the power bank is fully charged, it can also directly charge the mobile phone for emergency use. It is portable due to its small size and light weight. The power bank product with charger + power bank in one can be used as a charger to charge the connected mobile phone and charge itself when connected to the AC power supply. When leaving the AC power, it can use the built-in battery to discharge and charge the mobile phone without the need to carry an additional charger. Summary of the Utility Model

[0004] The utility model provides a charging control circuit and a charger to achieve efficient charging output and extend the service life.

[0005] According to one aspect of the utility model, a charging control circuit is provided. The charging control circuit includes a power primary module, a primary side controller, a secondary side controller, an isolation control circuit, and a filtering output module;

[0006] The power primary module is used to convert the AC input voltage into a first DC voltage;

[0007] The primary side controller is connected to the power primary module and is used to generate a primary side control signal based on the first DC voltage;

[0008] The secondary side controller is respectively connected to the input end of the primary side controller and the isolation control circuit, and is used to generate a secondary side control signal according to the primary side control signal and the isolation input signal fed back by the isolation control circuit;

[0009] The filtering output module is respectively connected to the output ends of the secondary side controller and the isolation control circuit, and is used to generate a second DC voltage according to the secondary side control signal and the isolation output signal fed back by the isolation control circuit, so as to provide the second DC voltage to the device to be charged.

[0010] Optionally, the primary side controller includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a ClampZero switch, a fifth resistor, a sixth resistor, a second zener diode, and a first diode;

[0011] The fourth capacitor is connected in parallel with the primary power module. One end of the fifth capacitor is connected to the ClampZero switch, and the other end of the fifth capacitor is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth resistor is respectively connected to the ClampZero switch, the secondary side controller, and the input end of the isolation control circuit, and the other end of the sixth resistor is connected to one end of the fifth capacitor. The ClampZero switch is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth capacitor is respectively connected to the fifth resistor and the ClampZero switch, and the other end of the sixth capacitor is respectively connected to one end of the seventh capacitor, the secondary side controller, and the input end of the isolation control circuit. The other end of the seventh capacitor is respectively connected to one end of the first diode and the other end of the fifth resistor. The other end of the first diode is respectively connected to the secondary side controller and the input end of the isolation control circuit. One ends of the eighth capacitor, the ninth capacitor, and the second zener diode are respectively connected to the ClampZero switch, and the other ends of the eighth capacitor, the ninth capacitor, and the second zener diode are respectively connected to the input end of the isolation control circuit.

[0012] Optionally, the ClampZero switch is respectively connected to the secondary side controller and the input end of the isolation control circuit.

[0013] Optionally, the secondary side controller includes an InnoSwitch4 main switch, a twelfth capacitor, a twelfth resistor, a fourteenth capacitor, a fifteenth capacitor, an eighteenth capacitor, and a fourteenth resistor;

[0014] One end of the twelfth capacitor is connected to the InnoSwitch4 main switch, and the other end of the twelfth capacitor is connected to the primary power module. The InnoSwitch4 main switch is respectively connected to one end of the twelfth resistor, one end of the fourteenth capacitor, and one end of the fifteenth capacitor. The other end of the twelfth resistor is connected to the isolation control circuit. The other end of the fourteenth capacitor is connected to the filter output module. The other end of the fifteenth capacitor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to the filter output module. The eighteenth capacitor is connected in parallel with the InnoSwitch4 main switch.

[0015] Optionally, the isolation control circuit includes a first voltage control circuit, an isolation transformer, a second voltage control circuit, and a third voltage control circuit;

[0016] The first voltage control circuit is respectively connected to the first winding and the second winding of the isolation transformer. The third voltage control circuit is respectively connected to the third winding of the isolation transformer and the filter output module, and the third voltage control circuit is respectively connected to the fourth winding of the isolation transformer and the filter output module.

[0017] Optionally, the first voltage control circuit includes a first zener diode, a seventh resistor, an eighth resistor, a first triode, a third zener diode, an eleventh resistor, a tenth capacitor, a second diode, a third resistor, and a fourth resistor;

[0018] The second voltage control circuit includes a second triode, a third diode, a thirteenth capacitor, a fourth diode, and a thirteenth resistor;

[0019] The third voltage control circuit includes a sixth diode, a sixteenth resistor, a nineteenth capacitor, and a twentieth capacitor.

[0020] Optionally, the filter output module includes a sixteenth capacitor, a seventeenth capacitor, a fifteenth resistor, a third triode, a fifth diode, a seventeenth resistor, and a twenty-first capacitor.

[0021] Optionally, the charging control circuit further includes an eleventh capacitor. One end of the eleventh capacitor is connected to the input end of the isolation control circuit, and the other end of the eleventh capacitor is connected to the filter output module.

[0022] Optionally, the primary power module includes an AC input circuit, an EMI filter circuit, and a rectifier filter circuit connected in sequence; the AC input circuit includes an L terminal and an N terminal connected to the mains, a varistor, a fuse, and a thermistor; the EMI filter circuit includes a filter, a first discharge resistor, a second discharge resistor, and a first capacitor; the rectifier filter circuit includes a rectifier bridge, a first electrolytic capacitor, a second electrolytic capacitor, and a second inductor.

[0023] According to another aspect of the present invention, a charger is provided, and the charger includes the charging control circuit according to any embodiment of the present invention.

[0024] The technical solution of the embodiment of the present invention uses InnoSwitch4-Pro gallium nitride as the primary switch for 65W fast charging design. Its steady-state switching frequency can reach 140kHz, greatly reducing the volume of the planar transformer, thereby reducing the volume and weight of the entire charger product, and the power density can reach 0.7W / cm 3, the battery of the power bank in the applicable two-in-one charger product samples polymer lithium batteries, which have high energy density, small volume, no memory effect and self-discharge phenomenon, and long service life.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic structural diagram of a charging control circuit provided according to an embodiment of the present invention;

[0028] Figure 2 is a schematic structural diagram of a power primary module in a charging control circuit provided according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Figure 1 is a schematic structural diagram of a charging control circuit provided according to an embodiment of the present invention, Figure 2 is a schematic structural diagram of a power primary module in a charging control circuit provided according to an embodiment of the present invention. This embodiment is applicable to maintaining a stable and efficient output mode whether it is fast charging charger charging or power bank discharging mode, with fast charging speed but no heat generation. The charging control circuit can be configured in a two-in-one charger product for fast charging and power bank.

[0031] As Figure 1 and Figure 2 shown, the charging control circuit includes a power primary module, a primary side controller, a secondary side controller, an isolation control circuit and a filter output module;

[0032] The primary power module is used to convert the AC input voltage into a first DC voltage;

[0033] The primary side controller is connected to the primary power module and is used to generate a primary side control signal based on the first DC voltage;

[0034] The secondary side controller is respectively connected to the primary side controller and the input end of the isolation control circuit, and is used to generate a secondary side control signal according to the primary side control signal and the isolation input signal fed back by the isolation control circuit;

[0035] The filtered output module is respectively connected to the output end of the secondary side controller and the isolation control circuit, and is used to generate a second DC voltage from the secondary side control signal and the isolation output signal fed back by the isolation control circuit, so as to provide the second DC voltage to the device to be charged.

[0036] Wherein, the device to be charged can be a mobile phone, a notebook, a polymer lithium battery power bank or other devices, and this embodiment does not impose any restrictions on this.

[0037] The primary power module includes an AC input circuit, an EMI filter circuit and a rectifier filter circuit connected in sequence; the AC input circuit includes an L terminal and an N terminal connected to the mains, a varistor, a fuse and a thermistor; the EMI filter circuit includes a filter, a first discharge resistor R1, a second discharge resistor R2 and a first capacitor C1; the rectifier filter circuit includes a rectifier bridge, a first electrolytic capacitor C2, a second electrolytic capacitor C3 and a second inductor L2.

[0038] The AC input circuit is connected to the mains through the L terminal and the N terminal, and the varistor, the fuse and the thermistor protect the power supply incoming line; the EMI filter circuit is composed of a filter LF1, a first discharge resistor R1, a second discharge resistor R2 and a first capacitor C1, which can effectively improve the EMI characteristics of the whole circuit; the rectifier filter circuit is composed of a rectifier bridge, a first electrolytic capacitor C2, a second electrolytic capacitor C3 and a second inductor L2, and the rectifier bridge includes four diodes D1, D2, D3, D4.

[0039] In this embodiment, through the EMI filter circuit and the rectifier filter circuit, the AC input voltage is converted into a smooth first DC voltage and enters the primary side controller.

[0040] On this basis, continue to refer to Figure 1 and Figure 2, the primary side controller includes a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a ClampZero switch U1, a fifth resistor R5, a sixth resistor R6, a second zener diode VR2, and a first diode D1;

[0041] The fourth capacitor C4 is connected in parallel to the primary power module. One end of the fifth capacitor C5 is connected to the ClampZero switch U1, and the other end of the fifth capacitor C5 is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth resistor R6 is respectively connected to the ClampZero switch U1, the secondary side controller, and the input end of the isolation control circuit. The other end of the sixth resistor R6 is connected to one end of the fifth capacitor C5. The ClampZero switch U1 is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth capacitor C6 is respectively connected to the fifth resistor R5 and the ClampZero switch U1, and the other end of the sixth capacitor C6 is respectively connected to one end of the seventh capacitor C7, the secondary side controller, and the input end of the isolation control circuit. The other end of the seventh capacitor C7 is respectively connected to one end of the first diode D1 and the other end of the fifth resistor R5. The other end of the first diode D1 is respectively connected to the secondary side controller and the input end of the isolation control circuit. One ends of the eighth capacitor C8, the ninth capacitor C9, and the second zener diode VR2 are respectively connected to the ClampZero switch U1, and the other ends of the eighth capacitor C8, the ninth capacitor C9, and the second zener diode VR2 are respectively connected to the input end of the isolation control circuit. The ClampZero switch U1 is respectively connected to the secondary side controller and the input end of the isolation control circuit.

[0042] Optionally, in this embodiment, the model of the ClampZero switch U1 can be CPZ1075M. The selected parameter of the sixth capacitor C6 can be 100nF 25V, the selected parameter of the seventh capacitor C7 can be 100 μ F 50V, the selected parameter of the fifth resistor R5 can be 60.4 kΩ, 1%, 1 / 10W, the selected parameter of the sixth resistor R6 can be 3.74 kΩ, 1%, 1 / 10W, and the selected parameter of the first diode D1 can be HS1KFL, 800V.

[0043] On this basis, continue to refer to Figure 1 and Figure 2, the secondary side controller includes InnoSwitch4 main switch U2, twelfth capacitor C12, twelfth resistor R12, fourteenth capacitor C14, fifteenth capacitor C15, eighteenth capacitor C18, and fourteenth resistor R14.

[0044] Optionally, the selected parameter of the twelfth capacitor C12 can be 4.7 μ F 25V, the selected parameter of the twelfth resistor R12 can be 47Ω, 1 / 10W, the selected parameter of the fourteenth capacitor C14 can be 2.2 μ F 25V, the selected parameter of the fifteenth capacitor C15 can be 4.7 μ F 10V, the selected parameter of the eighteenth capacitor C18 can be 100nF 25V, the selected parameter of the fourteenth resistor R14 can be 10Ω, 1%, 1 / 10W.

[0045] One end of the twelfth capacitor C12 is connected to the InnoSwitch4 main switch U2, the other end of the twelfth capacitor C12 is connected to the power primary module, the InnoSwitch4 main switch U2 is respectively connected to one end of the twelfth resistor R12, one end of the fourteenth capacitor C14, and one end of the fifteenth capacitor C15, the other end of the twelfth resistor R12 is connected to the isolation control circuit, the other end of the fourteenth capacitor C14 is connected to the filter output module, the other end of the fifteenth capacitor C15 is connected to one end of the fourteenth resistor R14, the other end of the fourteenth resistor R14 is connected to the filter output module, and the eighteenth capacitor C18 is connected in parallel with the InnoSwitch4 main switch U2.

[0046] It can be known that the other end of the twelfth capacitor C12 is connected to the power primary module, that is, connected to the fourth capacitor C4, fifth capacitor C5, and sixth resistor R6, and the InnoSwitch4 main switch U2 is connected to the fourth capacitor C4, fifth capacitor C5, and sixth resistor R6.

[0047] The InnoSwitch4 main switch U2 is applied to the active clamp flyback architecture, with an internal active clamp upper tube drive signal output. It realizes active clamp operation through an external ClampZero and recovers the leakage inductance energy. It can achieve a conversion efficiency of up to 95%.

[0048] The InnoSwitch4 main switch U2 outputs the control signal of the active clamp switch tube through the built-in drive signal pin. When the main switch tube is turned off, the energy of the transformer leakage inductance is stored in the clamp capacitor through the diode. Before the next turn-on of the main switch tube, the external ClampZero switch tube U1 releases the energy in the clamp capacitor into the primary coil and transfers it to the secondary. After the primary is reversely excited, with the turn-off of the ClampZero switch tube U1, zero-voltage turn-on of the main switch tube is achieved, thereby reducing the switching loss, reducing the temperature rise of the main switch tube, and further enabling high-frequency operation. At the same time, in the active clamp flyback architecture, all the energy in the clamp capacitor can be recovered, unlike the QR flyback architecture where the leakage inductance energy is all converted into waste heat and dissipated by the clamp resistor. The active clamp flyback architecture can achieve zero-voltage switching of the main switch tube under full load conditions, and the output synchronous rectifier tube can achieve zero-current turn-off, while optimizing the EMI characteristics, which is very suitable for the design of small-size, high-frequency switching power supplies.

[0049] Optionally, in this embodiment, the InnoSwitch4 main switch U2 can adopt InnoSwitch4-Pro, and the model of the InnoSwitch4 main switch U2 can be INN4373F-H341.

[0050] On this basis, continue to refer to Figure 1 and Figure 2 , the isolation control circuit includes a first voltage control circuit, an isolation transformer, a second voltage control circuit, and a third voltage control circuit;

[0051] The first voltage control circuit is respectively connected to the first winding and the second winding of the isolation transformer, the third voltage control circuit is respectively connected to the third winding of the isolation transformer and the filter output module, and the third voltage control circuit is respectively connected to the fourth winding of the isolation transformer and the filter output module.

[0052] Continue to refer to Figure 1 and Figure 2 , the first voltage control circuit includes a first zener diode VR1, a seventh resistor R7, an eighth resistor R8, a first triode Q1, a third zener diode VR3, an eleventh resistor R11, a tenth capacitor C10, a second diode D2, a third resistor R3, and a fourth resistor R4;

[0053] The second voltage control circuit includes a second triode Q2, a third diode D3, a thirteenth capacitor C13, a fourth diode D4, and a thirteenth resistor R13;

[0054] The third voltage control circuit includes a sixth diode D6, a sixteenth resistor R16, a nineteenth capacitor C19, and a twentieth capacitor C20.

[0055] Optionally, the selected parameters of the first voltage regulator diode VR1 can be MM3Z11VC, 11V; the selected parameters of the seventh resistor R7 can be 82 kΩ, 1 / 10 W; the selected parameters of the eighth resistor R8 can be 2.5 kΩ, 1%, 1 / 10 W; the selected parameters of the first triode Q1 can be MMBTA06LT1G; the selected parameters of the third voltage regulator diode VR3 can be MMSZ5258B-7-F; the selected parameters of the eleventh resistor R11 can be 499 Ω, 1%, 1 / 8 W; the selected parameters of the tenth capacitor C10 can be 22 μ F63V; the selected parameters of the second diode D2 can be BAV3004WS-7, 300V; the selected parameters of the third resistor R3 can be 200 MΩ, 1%; the selected parameters of the fourth resistor R4 can be 1.8 MΩ, 1%.

[0056] The selected parameters of the second triode Q2 can be A0N6220; the selected parameters of the third diode D3 can be V12P12-M3 / 86A; the selected parameters of the thirteenth capacitor C13 can be 2.2 nF 200V; the selected parameters of the fourth diode D4 can be BAV19WS; the selected parameters of the thirteenth resistor R13 can be 10 Ω.

[0057] The selected parameters of the sixth diode D6 can be BAV19WS; the selected parameters of the sixteenth resistor R16 can be 820 Ω, 1 / 10 W; the selected parameters of the nineteenth capacitor C19 can be 2.2 μ F25V; the selected parameters of the twentieth capacitor C20 can be 10 μ F25V.

[0058] It is known that one end of the first voltage stabilizing diode VR1 is respectively connected to the ClampZero switch tube U1, the fourth capacitor C4, the fifth capacitor C5, the sixth resistor R6, the twelfth capacitor C12 and the InnoSwitch4 main switch U2. The other end of the first voltage stabilizing diode VR1 is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to one end of the seventh resistor R7 and one end of the first triode Q1. The other end of the seventh resistor R7 is connected to one end of the second diode D2. The other end of the second diode D2 is connected to the second winding of the isolation transformer. One end of the tenth resistor R10 is connected to one end of the first diode D1 and one end of the first triode Q1. The other end of the tenth resistor R10 is connected to the ClampZero switch tube U1, the fifth capacitor C5, the sixth resistor R6, the twelfth capacitor C12 and the InnoSwitch4 main switch U2. One end of the third voltage stabilizing diode VR3 is connected to one end of the eleventh resistor R11. The other end of the third voltage stabilizing diode VR3 is connected to the other end of the tenth resistor R10, the ClampZero switch tube U1, the fifth capacitor C5, the sixth resistor R6, the twelfth capacitor C12 and the InnoSwitch4 main switch U2. The other end of the eleventh resistor R11 is connected to one end of the second diode D2. One end of the tenth capacitor C10 is connected to one end of the second diode D2. The other end of the tenth capacitor C10 is connected to one end of the first triode Q1, the other end of the third voltage stabilizing diode VR3, the other end of the tenth resistor R10, the ClampZero switch tube U1, the fifth capacitor C5, the sixth resistor R6, the twelfth capacitor C12 and the InnoSwitch4 main switch U2.

[0059] The second triode Q2 is respectively connected to the third winding of the isolation transformer and one end of the fifteenth resistor R15. The third diode D3 is connected in parallel across the second triode Q2. The thirteenth capacitor C13 and the fourth diode D4 are connected in series and then connected in parallel across the second triode Q2. The thirteenth resistor R13 is connected in parallel across the fourth diode D4.

[0060] One end of the sixth diode D6 is respectively connected to one end of the sixteenth resistor R16 and one end of the twentieth capacitor C20. The other end of the sixth diode D6 is connected to the third winding of the isolation transformer. One end of the sixteenth resistor R16 is connected to one end of the twentieth capacitor C20. The other end of the sixteenth resistor R16 is connected to one end of the nineteenth capacitor C19. The other end of the nineteenth capacitor C19 and the other end of the twentieth capacitor C20 are connected to the third winding of the isolation transformer.

[0061] On this basis, continue to refer to Figure 1 and Figure 2, the filtering output module includes a sixteenth capacitor C16, a seventeenth capacitor C17, a fifteenth resistor R15, a third triode Q3, a fifth diode D5, a seventeenth resistor R17, and a twenty-first capacitor C21.

[0062] Optionally, the selected parameter of the sixteenth capacitor C16 can be 470 μ F25V, the selected parameter of the seventeenth capacitor C17 can be 470 μ F25V, the selected parameter of the fifteenth resistor R15 can be 0.009Ω, 1%, 1 / 2W, the selected parameter of the third triode Q3 can be A0N7318, the selected parameter of the fifth diode D5 can be BAV19WS, the selected parameter of the seventeenth resistor R17 can be 560Ω, 1 / 10W, and the selected parameter of the twenty-first capacitor C21 can be 1 μ F50V.

[0063] The sixteenth capacitor C16 and the seventeenth capacitor C17 are connected in parallel across both ends of the third winding of the isolation transformer. The fifth diode D5 and the seventeenth resistor R17 are connected in series, and after the fifth diode D5 and the seventeenth resistor R17 are connected in series, they are connected in parallel with the twenty-first capacitor C21.

[0064] On this basis, continue to refer to Figure 1 and Figure 2 , the charging control circuit further includes an eleventh capacitor C11. One end of the eleventh capacitor C11 is connected to the input end of the isolation control circuit, and the other end of the eleventh capacitor C11 is connected to the filtering output module.

[0065] Optionally, the selected parameter of the eleventh capacitor C11 can be 470 p F25V.

[0066] In the technical solution of this embodiment, the AC input voltage first passes through the fuse and the EMI filter inductor of the power primary module, and then is converted into a first DC voltage through the rectifying bridge. Two 100uF support capacitors (i.e., the first electrolytic capacitor C2 and the second electrolytic capacitor C3) are added to the DC bus for filtering. Further, it is converted into a PWM-type voltage through the ClampZero switch tube U1 integrated in the INN4574F chip, and is isolated and output to two 470uF filtering capacitors (i.e., the sixteenth capacitor C16 and the seventeenth capacitor C17) through the isolation transformer, and then becomes a stable DC to supply power to the subsequent mobile phone, notebook, or polymer lithium battery power bank.

[0067] Based on the same inventive concept, an embodiment of the present invention further provides a charger, which includes the charging control circuit described in any embodiment of the present invention.

[0068] The charging control circuit of the present utility model uses the INN4574F chip as the main control chip of the fast charging circuit. The INN4574F integrates a primary power module, a primary side controller, a secondary side controller, an isolation control circuit (a secondary side controller with synchronous rectification drive), and a filter output module (adopting the innovative FluxLink technology that can eliminate the optocoupler). This enables the highly integrated packaging of the power chip, which is beneficial to reducing the volume of the charger design. The INN4574F technology has zero voltage switching characteristics and a higher switching frequency without sacrificing efficiency. When including line voltage detection and power supply to an external microprocessor, the no-load power consumption can reach below 30 mW. It uses a stable and durable 750V PowiGaN gallium nitride primary switch with a steady-state switching frequency as high as 140 kHz and an output of up to 220W, which shrinks the planar transformer on the fast charging circuit board to the extreme. In addition, the INN4574F has an extended instruction set, integrating fault protection types and enhanced features, such as input / output overvoltage / undervoltage (OV / UV) protection features, ISSC / CCSC features, VBUS switch short-circuit fault protection features. The instruction code is more simplified, the response is faster, and there are more options; it can select the operating mode of ACF or QR (without ClampZero), and with a ClampZero IC, it can recover the leakage inductance energy to achieve zero voltage turn-on (ZVS) to provide the best efficiency performance and use smaller magnetic components. The overall conversion efficiency can reach 95%.

[0069] On the above basis, the charger with a charging control circuit controls the charging curve, supports any protocol including UFCS, USB-PD, PPS, PD3.0, SCP, FCP, is compatible with CC1 and CC2, D+&D- command inputs, has a power status reporting function, and the protection features can be programmably set. At the same time, it controls various characteristics of the power supply through an interface (I 2 C) that is not affected by external protocols. The simple interface plus the high-frequency active clamping operation means that a design with an extremely small size can be achieved.

[0070] The above specific implementation manners do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A charging control circuit, characterized in that, The charging control circuit includes a primary power module, a primary side controller, a secondary side controller, an isolation control circuit, and a filtering output module; The primary power module is used to convert an AC input voltage into a first DC voltage; The primary side controller is connected to the primary power module and is used to generate a primary side control signal based on the first DC voltage; The secondary side controller is respectively connected to the primary side controller and the input end of the isolation control circuit, and is used to generate a secondary side control signal according to the primary side control signal and the isolation input signal fed back by the isolation control circuit; The filtering output module is respectively connected to the output ends of the secondary side controller and the isolation control circuit, and is used to generate a second DC voltage based on the secondary side control signal and the isolation output signal fed back by the isolation control circuit, so as to provide the second DC voltage to the device to be charged.

2. The charging control circuit according to claim 1, wherein The primary side controller includes a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a ClampZero switching tube, a fifth resistor, a sixth resistor, a second zener diode, and a first diode; The fourth capacitor is connected in parallel with the primary power module. One end of the fifth capacitor is connected to the ClampZero switching tube, and the other end of the fifth capacitor is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth resistor is respectively connected to the ClampZero switching tube, the secondary side controller, and the input end of the isolation control circuit, and the other end of the sixth resistor is connected to one end of the fifth capacitor. The ClampZero switching tube is respectively connected to the secondary side controller and the input end of the isolation control circuit. One end of the sixth capacitor is respectively connected to the fifth resistor and the ClampZero switching tube, and the other end of the sixth capacitor is respectively connected to one end of the seventh capacitor, the secondary side controller, and the input end of the isolation control circuit. The other end of the seventh capacitor is respectively connected to one end of the first diode and the other end of the fifth resistor. The other end of the first diode is respectively connected to the secondary side controller and the input end of the isolation control circuit. One ends of the eighth capacitor, the ninth capacitor, and the second zener diode are respectively connected to the ClampZero switching tube, and the other ends of the eighth capacitor, the ninth capacitor, and the second zener diode are respectively connected to the input end of the isolation control circuit.

3. The charging control circuit according to claim 2, wherein The ClampZero switching tube is respectively connected to the secondary side controller and the input end of the isolation control circuit.

4. The charging control circuit according to claim 1, wherein The secondary side controller includes an InnoSwitch4 main switch, a twelfth capacitor, a twelfth resistor, a fourteenth capacitor, a fifteenth capacitor, an eighteenth capacitor, and a fourteenth resistor; One end of the twelfth capacitor is connected to the InnoSwitch4 main switch, and the other end of the twelfth capacitor is connected to the power primary module. The InnoSwitch4 main switch is respectively connected to one end of the twelfth resistor, one end of the fourteenth capacitor, and one end of the fifteenth capacitor. The other end of the twelfth resistor is connected to the isolation control circuit. The other end of the fourteenth capacitor is connected to the filter output module. The other end of the fifteenth capacitor is connected to one end of the fourteenth resistor. The other end of the fourteenth resistor is connected to the filter output module. The eighteenth capacitor is connected in parallel with the InnoSwitch4 main switch.

5. The charging control circuit according to claim 1, wherein The isolation control circuit includes a first voltage control circuit, an isolation transformer, a second voltage control circuit, and a third voltage control circuit; The first voltage control circuit is respectively connected to the first winding and the second winding of the isolation transformer. The third voltage control circuit is respectively connected to the third winding of the isolation transformer and the filter output module. The third voltage control circuit is respectively connected to the fourth winding of the isolation transformer and the filter output module.

6. The charging control circuit according to claim 5, wherein The first voltage control circuit includes a first zener diode, a seventh resistor, an eighth resistor, a first triode, a third zener diode, an eleventh resistor, a tenth capacitor, a second diode, a third resistor, and a fourth resistor; The second voltage control circuit includes a second triode, a third diode, a thirteenth capacitor, a fourth diode, and a thirteenth resistor; The third voltage control circuit includes a sixth diode, a sixteenth resistor, a nineteenth capacitor, and a twentieth capacitor.

7. The charging control circuit according to claim 1, wherein The filter output module includes a sixteenth capacitor, a seventeenth capacitor, a fifteenth resistor, a third triode, a fifth diode, a seventeenth resistor, and a twenty-first capacitor.

8. The charging control circuit according to claim 1, wherein The charging control circuit further includes an eleventh capacitor. One end of the eleventh capacitor is connected to the input end of the isolation control circuit, and the other end of the eleventh capacitor is connected to the filter output module.

9. The charging control circuit according to claim 1, wherein The power primary module includes an AC input circuit, an EMI filter circuit, and a rectifier filter circuit connected in sequence at the connection points. The AC input circuit includes an L terminal and an N terminal connected to the mains, a varistor, a fuse, and a thermistor. The EMI filter circuit includes a filter, a first discharge resistor, a second discharge resistor, and a first capacitor. The rectifier filter circuit includes a rectifier bridge, a first electrolytic capacitor, a second electrolytic capacitor, and a second inductor.

10. A charger, characterized in that, It includes the charging control circuit according to any one of claims 1-9.

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