Multi-path charging circuit and multi-path charging power supply

Abstract

The utility model discloses a kind of multi-path charging circuit and multi-path charging power supply, belong to electric energy conversion technical field, multi-path charging circuit includes: anti-electromagnetic interference module, rectifier module, direct current-direct current conversion module, first step-down module, second step-down module, pulse width modulation module, microcontrol module, output voltage detection module and intelligent communication module;Multi-path charging power supply includes: power supply shell and circuit board, and the above one multi-path charging circuit is integrated in circuit board.The utility model has remote alarm and charging current adjustable function, can be charged to the equipment of two different powers, and according to battery load requirement, user habit or specific scene demand, remote manual adjustment charging current size.

Description

Technical Field

[0001] This utility model relates to the field of power conversion technology, and in particular to a multi-channel charging circuit and a multi-channel charging power supply. Background Technology

[0002] As a common power conversion device, charging power supplies are widely used in consumer electronics, mobile devices, and various household appliances, including power conversion circuits and control circuits. Flyback converters are very common in small and medium power charging power supplies, offering advantages such as simple drive circuitry, high reliability, and small size. They typically integrate power factor correction (PFC) to meet energy efficiency and electromagnetic compatibility requirements. In their design, discontinuous conduction mode (DCM) or critical conduction mode (BCM) are employed to achieve high efficiency and low electromagnetic interference immunity. However, for high-power charging power supply designs, the application of flyback converters presents several design challenges. The design must ensure that the flyback converter maintains high efficiency and good thermal performance at high power levels. Choosing an LLC half-bridge converter topology presents problems such as complex control, low accuracy of the resonant network, high cost, and large size.

[0003] Meanwhile, existing charging power supplies are mainly single-output and can only charge a single fixed battery. In industrial sites, such as processing workshops where various power tools are frequently used, there are many types and a large number of batteries. In order to improve work efficiency, it is necessary to charge the depleted batteries in a timely manner. Single-output charging power supplies are inconvenient to use. Therefore, there is an urgent need for multi-channel charging power supplies that can charge multiple batteries of different types at the same time. Utility Model Content

[0004] This utility model aims to provide a multi-channel charging circuit and a multi-channel charging power supply with remote alarm and control functions. It enables charging of two battery loads with different power levels, solving the problems of poor heat dissipation, weak anti-interference ability, single power charging, and large charging current and voltage ripple in traditional equipment, which leads to short battery load life. It can also remotely and manually adjust the charging current according to battery load requirements, user habits, or specific scenario needs.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A multi-channel charging circuit includes,

[0007] Electromagnetic interference suppression module

[0008] The rectifier module is connected at its first end to the first end of the electromagnetic interference suppression module.

[0009] A DC-DC converter module, the first terminal of which is connected to the second terminal of the rectifier module;

[0010] The first step-down module has a first terminal connected to the second terminal of the DC-DC converter module, and the second terminal of the first step-down module is connected to the first output voltage.

[0011] The second step-down module has its first terminal connected to the second terminal of the DC-DC converter module, and its second terminal connected to the second output voltage.

[0012] A pulse width modulation module, wherein the first terminal of the pulse width modulation module is connected to the third terminal of the first buck module, and the second terminal of the pulse width modulation module is connected to the third terminal of the second buck module;

[0013] The microcontroller module has its first terminal connected to the third terminal of the pulse width modulation module, its second terminal connected to the second terminal of the first buck module, and its third terminal connected to the second terminal of the second buck module.

[0014] The output voltage detection module has its first terminal connected to the fourth terminal of the microcontroller module, its second terminal connected to the second terminal of the first step-down module, and its third terminal connected to the second terminal of the second step-down module.

[0015] The intelligent communication module has its first terminal connected to the fifth terminal of the microcontroller module, its second terminal connected to the fourth terminal of the microcontroller module, and its third terminal connected to the third terminal of the DC-DC converter module.

[0016] Optionally, the multi-channel charging circuit also includes a cooling fan drive module, the first end of which is connected to the third end of the DC-DC converter module and the third end of the intelligent communication module.

[0017] Optionally, the DC-DC converter module includes: a primary-side feedback controller, a ripple reduction controller, a transformer, a first three-terminal regulator, a second three-terminal regulator, a first switch, a second switch, a first diode, a second diode, a first capacitor, and a second capacitor; the transformer includes: a primary winding, a secondary winding, and a primary winding and a secondary winding.

[0018] The first end of the primary winding is connected to the first end of the primary feedback controller, and the second end of the primary winding is connected to the first end of the first switch. The second end of the first switch and the first end of the primary winding are connected in parallel with the first DC power supply. The first end of the primary winding is connected to the second end of the primary feedback controller, and the second end of the primary winding is grounded after being connected to the first end of the primary winding. The first end of the secondary winding is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, and the second end of the secondary winding is connected to the second end of the first capacitor. The first end of the secondary winding is connected to the anode of the second diode. The cathode of the second diode is connected to the first terminal of the second switch, the second terminal of the second switch is connected to the first terminal of the second capacitor, and the second terminal of the secondary winding is connected to the second terminal of the second capacitor. The first terminal of the first capacitor and the second terminal of the second diode are respectively connected to the first terminal of the ripple reduction controller, and the second terminal of the ripple reduction controller is connected to the second terminal of the second switch. The secondary winding is connected in parallel with the first terminal of the first three-terminal voltage regulator, and the second terminal of the first three-terminal voltage regulator is connected in parallel with the first terminal of the second three-terminal voltage regulator. The primary winding is connected in parallel with the secondary winding and the secondary winding is connected in parallel.

[0019] The second terminal of the first switch and the first terminal of the primary winding constitute the first terminal of the DC-DC converter module. The first terminal of the first capacitor and the second terminal of the second capacitor constitute the second terminal of the DC-DC converter module. The second terminals of the first three-terminal regulator and the second three-terminal regulator are the third terminals of the DC-DC converter module.

[0020] Optionally, the first step-down module and the second step-down module each include: a third switch, a fourth switch, a first inductor, a third capacitor, a first feedback resistor, a second feedback resistor, a reference comparator, and a power driver; the first terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the first inductor, the second terminal of the first inductor is connected to the first terminal of the third capacitor and the first terminal of the first feedback resistor, the second terminal of the fourth switch is connected to the second terminal of the third capacitor and the first terminal of the second feedback resistor, the second terminal of the first feedback resistor is connected to the second terminal of the second feedback resistor and the first terminal of the reference comparator, the second terminal of the reference comparator is connected to the first terminal of the power driver, and the second terminal of the power driver is connected to the third terminal of the third switch and the third terminal of the fourth switch respectively;

[0021] The first terminal of the third switch is the first terminal of the first buck module or the second buck module, the first and second terminals of the first feedback resistor constitute the second terminal of the first buck module or the second buck module, and the first terminal of the reference comparator is the third terminal of the first buck module or the second buck module.

[0022] Optionally, the microcontroller module includes: a charge / stop control unit and a protection unit, wherein the first terminal of the charge / stop control unit is the first terminal of the microcontroller module, the second terminal of the charge / stop control unit is the second or third terminal of the microcontroller module, the third terminal of the charge / stop control unit is the fourth terminal of the microcontroller module, and the fourth terminal of the charge / stop control unit is the fifth terminal of the microcontroller module; the first terminal of the protection unit is the second or third terminal of the microcontroller module, and the second terminal of the protection unit is the fourth terminal of the microcontroller module.

[0023] Optionally, the charging / stop control unit includes: a third diode, a fourth diode, a fifth diode, a first comparator, a second comparator, a fourth capacitor, a transistor, a first light-emitting diode, a second light-emitting diode, a second DC power supply, and first to eleventh resistors;

[0024] The first terminal of the first resistor is connected to the first terminal of the second resistor. The second terminal of the first resistor is connected to the negative input terminal of the first comparator and the anode of the fifth diode. The cathode of the fifth diode is grounded. The first terminal of the second resistor is connected to the first terminal of the third resistor, the first terminal of the fourth resistor, and the anode of the third diode. The second terminal of the second resistor is connected to the anode of the first LED. The cathode of the first LED is connected to the first terminal of the seventh resistor. The second terminal of the seventh resistor is connected to the anode of the second LED. The cathode of the second LED is connected to the cathode of the fifth diode, the first terminal of the fourth capacitor, and the first terminal of the eighth resistor. The second terminal of the third resistor is connected to the positive input terminal of the second comparator, the second terminal of the eighth resistor, and the first terminal of the tenth resistor. The second terminal of the tenth resistor is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is connected to the second terminal of the fourth capacitor; the cathode of the third diode is connected to the anode of the fourth diode, the second terminal of the fourth resistor is connected to the cathode of the fourth diode, the first terminal of the fifth resistor and the first terminal of the transistor, the second terminal of the transistor is connected to the first terminal of the sixth resistor and the first terminal of the second DC power supply, the second terminal of the second DC power supply is connected to the first terminal of the eleventh resistor and the second terminal of the eleventh resistor, the third terminal of the eleventh resistor is connected to the second terminal of the sixth resistor, the first terminal of the eleventh resistor is connected to the positive input terminal of the first comparator, the output terminal of the first comparator is connected to the negative input terminal of the second comparator, and the output terminal of the second comparator is connected to the second terminal of the fifth resistor;

[0025] The second terminals of the transistor are the first and second terminals of the charge-stop control unit, respectively. The first terminal of the first resistor is the third terminal of the charge-stop control unit. The charge-stop signals of the first and second LEDs are transmitted through the third terminal of the charge-stop control unit. The first terminal of the transistor is the fourth terminal of the charge-stop control unit.

[0026] Optionally, the protection unit includes: circuit breaking protection structure, over-temperature protection structure, over-current protection structure, over-voltage protection structure, and alarm structure;

[0027] The first ends of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, and over-voltage protection structure are respectively connected to the first end of the alarm structure. The second end of the circuit breaker protection structure is connected to the second end of the over-temperature protection structure. The third end of the over-temperature protection structure is connected to the second end of the over-current protection structure. The third end of the over-current protection structure is connected to the second end of the over-voltage protection structure. The third end of the circuit breaker protection structure, the fourth end of the over-temperature protection structure, and the fourth end of the over-current protection structure are the first ends of the protection unit. The third end of the over-voltage protection structure and the third end of the alarm structure are the second ends of the protection unit. The second end of the alarm structure is the first end of the protection unit.

[0028] Optionally, the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, and over-voltage protection structure respectively include: the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the third comparator, and the twenty-first resistor;

[0029] The first terminal of the twelfth resistor is connected to the DC-DC converter voltage. The second terminal of the twelfth resistor is connected to the first terminal of the thirteenth resistor and the positive input terminal of the third comparator. The second terminal of the thirteenth resistor is grounded. The negative input terminal of the third comparator is connected to the first terminal of the fourteenth resistor. The second terminal of the fourteenth resistor is connected to the auxiliary voltage. The output terminal of the third comparator is connected to the first terminal of the twenty-first resistor. The fourth terminal of the third comparator is connected to the auxiliary voltage. The fifth terminal of the third comparator is grounded. The first terminal of the fourteenth resistor is the second terminal of the circuit breaker protection structure. The second terminal of the twenty-first resistor is the first terminal of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, or over-voltage protection structure. The first terminal of the twelfth resistor is the third terminal of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, or over-voltage protection structure.

[0030] Optionally, the alarm structure includes: an OR gate, a 26th resistor, a 27th resistor, a 28th resistor, a 3rd LED, a 5th switch, a 6th diode, an active buzzer, and a relay;

[0031] The first terminal of the OR gate is connected to the first terminals of the 26th and 27th resistors. The second terminal of the 26th resistor is connected to the anode of the third LED. The cathode of the third LED is connected to the first terminal of the 28th resistor and the first terminal of the fifth switch and grounded. The second terminal of the 28th resistor is connected to the second terminal of the 27th resistor and the second terminal of the fifth switch. The third terminal of the fifth switch is connected to the first terminal of the relay, the anode of the 6th diode, and the first terminal of the active buzzer. The second terminal of the relay is connected to the cathode of the 6th diode, the second terminal of the active buzzer, and the auxiliary voltage. The third terminal of the relay is connected to the positive output voltage. The fourth terminal of the relay is connected to the first terminal of the feedback resistor. That is, the relay is connected in series between the second terminal of the step-down module and the battery load. The second, third, fourth, and fifth terminals of the OR gate are the first terminals of the alarm structure, and the third and fourth terminals of the relay constitute the second terminal of the alarm structure.

[0032] A multi-channel charging power supply includes: a power supply casing and a circuit board;

[0033] The power supply casing has power cords at both ends, with the live and neutral wires connected to the positive and negative terminals of the circuit board, respectively. Multiple ventilation holes are located on the left and right sides of the power supply casing. Two sets of power output lines are connected to the other side of the power supply casing: a first power output line and a second power output line, which are connected to the battery load. Multiple ventilation holes are located at the wire insertion points at both ends of the power supply casing, and mounting slots are located at the bottom of the fan-shaped areas at the wire insertion points at both ends of the power supply casing. An indicator light is located on the left or right side of the power supply casing. A buzzer alarm window is located at one end of the power supply casing, which is connected to both ends of the power supply casing and the end with the indicator light.

[0034] The circuit board includes a heat dissipation module. The lower end of the heat dissipation module is connected to a heat-conducting plate, and a capacitor is set on the upper end of the heat-conducting plate. An integrated module is set on one end of the capacitor. The integrated module integrates a multi-channel charging circuit as described above.

[0035] The multi-channel charging circuit and multi-channel charging power supply provided in this application have remote alarm and control functions, improve the load-carrying power of the multi-channel charging circuit and multi-channel charging power supply, realize independent charging of two battery loads with different power, expand the application range, and meet more complex application scenarios; at the same time, it improves safety and stability, reduces the damage of current and voltage ripple to battery loads, realizes alarm feedback for working faults through a built-in independent intelligent communication module, and can remotely and manually adjust the charging current and charging / stopping of battery loads according to battery load requirements, user habits, or specific scenario needs; furthermore, it extends the service life of the multi-channel charging circuit and multi-channel charging power supply, reduces the size of the multi-channel charging circuit and multi-channel charging power supply, and improves working efficiency; it solves the problems of poor heat dissipation, weak anti-interference ability, single power charging, and large charging current and voltage ripple that lead to short battery load life in traditional equipment, and is especially suitable for occasions such as factory processing workshops where frequent battery replacement and charging are required.

[0036] To make the above-mentioned features and advantages of the utility model more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0037] Figure 1 A block diagram of the multi-channel charging circuit provided in this application.

[0038] Figure 2 This is the circuit diagram for DC-DC converter module 3.

[0039] Figure 3 This is the circuit diagram of the first step-down module 4.

[0040] Figure 4 The circuit diagram for the charge / stop control unit 71.

[0041] Figure 5 The circuit diagram for protection unit 72.

[0042] Figure 6 This is the circuit diagram of pulse width modulation module 6.

[0043] Figure 7 This is a circuit diagram of the cooling fan drive module 10.

[0044] Figure 8 This is the control block diagram of the ripple removal controller 32.

[0045] Figure 9 This is a schematic diagram of a multi-channel charging power supply.

[0046] In the accompanying drawings, similar reference numerals refer to the same elements. Detailed Implementation

[0047] To make the objectives and technical solutions of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0048] In one embodiment of this application, please refer to Figure 1 , Figure 1 This application provides a multi-channel charging circuit, as shown in the block diagram, comprising:

[0049] Electromagnetic Interference (EMI) Module 1

[0050] Rectifier module 2, the first end of which is connected to the first end of electromagnetic interference suppression module 1;

[0051] DC-DC converter module 3, the first end of DC-DC converter module 3 is connected to the second end of rectifier module 2;

[0052] The first step-down module 4 has its first terminal connected to the second terminal of the DC-DC converter module 3, and its second terminal connected to the first output voltage V. out1 connect;

[0053] The second step-down module 5 has its first terminal connected to the second terminal of the DC-DC converter module 3, and its second terminal connected to the second output voltage V. out2 connect;

[0054] The pulse width modulation (PWM) module 6 has its first terminal connected to the third terminal of the first buck module 4, and its second terminal connected to the third terminal of the second buck module 5.

[0055] The microcontroller module 7 has its first terminal connected to the third terminal of the pulse width modulation module 6, its second terminal connected to the second terminal of the first buck module 4, and its third terminal connected to the second terminal of the second buck module 5.

[0056] The output voltage detection module 8 has its first terminal connected to the fourth terminal of the microcontroller module 7, its second terminal connected to the second terminal of the first step-down module 4, and its third terminal connected to the second terminal of the second step-down module 5.

[0057] The intelligent communication module 9 has its first terminal connected to the fifth terminal of the microcontroller module 7, its second terminal connected to the fourth terminal of the microcontroller module 7, and its third terminal connected to the third terminal of the DC-DC converter module 3.

[0058] As an example, the multi-channel charging circuit may also include: a cooling fan drive module 10, the first end of which is connected to the third end of the DC-DC converter module 3 and the third end of the intelligent communication module 9, respectively.

[0059] The multi-channel charging circuit provided in this application features remote alarm and control functions, increases the load-carrying power of the multi-channel charging circuit, enables independent charging of two battery loads with different power levels, expands the application range, and meets more complex application scenarios. Simultaneously, it improves safety and stability, reduces the damage to the battery load caused by current and voltage ripple, and achieves alarm feedback for operational faults through a built-in independent intelligent communication module. It can also remotely and manually adjust the charging current and battery load charging / stopping based on battery load requirements, user habits, or specific scenario needs. Furthermore, it extends the service life of the multi-channel charging circuit, reduces its size, and improves working efficiency. It solves the problems of poor heat dissipation, weak anti-interference ability, single-power charging, and large charging current and voltage ripple leading to short battery load lifespan in traditional equipment, making it particularly suitable for occasions such as factory processing workshops where frequent battery replacement and charging are required.

[0060] As an example, the first output voltage V out1 Connect the first battery load.

[0061] As an example, the second output voltage V out2 Connect the second battery load.

[0062] As an example, the electromagnetic interference suppression module 1 includes: an inductor and a capacitor to suppress noise, a common-mode choke and a differential-mode choke to suppress common-mode and differential-mode interference, a varistor to suppress voltage spikes and provide lightning protection, and a negative temperature coefficient (NTC) thermistor to limit the inrush current formed by charging the main capacitor of the power supply; wherein, the NTC thermistors are connected in parallel to short-circuit the NTC thermistors after the power supply enters normal operating condition, thereby reducing current loss.

[0063] As an example, rectifier module 2 includes a rectifier diode, an output filter capacitor, and a load resistor, which realizes a circuit to convert alternating current (AC) into direct current (DC), reducing voltage fluctuations and providing a more stable DC voltage V. dc The function.

[0064] In one embodiment, the rectifier module 2 is a full-bridge rectifier circuit.

[0065] For example, please refer to Figure 2 , Figure 2 This is a circuit diagram of DC-DC converter module 3. DC-DC converter module 3 includes: a primary-side feedback controller 31, a ripple reduction controller 32, a transformer T1, a first three-terminal voltage regulator 33, a second three-terminal voltage regulator 34, a first switch S1, a second switch S2, a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2. Transformer T1 includes: a primary winding N1, a secondary winding N2, a secondary winding N3, a primary winding N4, and a secondary winding N5. The first terminal of the primary winding N1 is connected to the first terminal of the primary-side feedback controller 31, and the second terminal of the primary winding N1 is connected to the first terminal of the first switch S1. The second terminal of the first switch S1 and the first terminal of the primary winding N1 are connected to the first DC power supply V. dc1 Parallel connection; the first terminal of the primary winding N4 is connected to the second terminal of the primary feedback controller 31, and the second terminal of the primary winding N4 is connected to the first terminal of the primary winding N4 and then grounded; the first terminal of the secondary winding N2 is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the first terminal of the first capacitor C1, and the second terminal of the secondary winding N2 is connected to the second terminal of the first capacitor C1; the first terminal of the secondary winding N3 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the first terminal of the second switch S2, and the second terminal of the second switch S2 is connected to the second capacitor C1. The first terminal of capacitor C2 is connected to the second terminal of the secondary winding N3, and the second terminal of the secondary winding N3 is connected to the second terminal of the second capacitor C2. The first terminal of the first capacitor C1 and the second terminal of the second capacitor C2 are respectively connected to the first terminal of the ripple reduction controller 32, and the second terminal of the ripple reduction controller 32 is connected to the second terminal of the second switch S2. The secondary winding N5 is connected in parallel with the first terminal of the first three-terminal voltage regulator 33, and the second terminal of the first three-terminal voltage regulator 33 is connected in parallel with the first terminal of the second three-terminal voltage regulator 34. The primary winding N1 is connected in parallel with the secondary windings N2 and N3, and the primary winding N4 is connected in parallel with the secondary winding N5. The second terminal of the first switch S1 and the first terminal of the primary winding N1 constitute the first terminal of the DC-DC converter module 3, the first terminal of the first capacitor C1 and the second terminal of the second capacitor C2 constitute the second terminal of the DC-DC converter module 3, and the second terminals of the first three-terminal voltage regulator 33 and the second three-terminal voltage regulator 34 are the third terminals of the DC-DC converter module 3.

[0066] Specifically, the first DC-DC converter voltage sampled by the first capacitor C1 is V. o1 The second DC-DC converter voltage sampled by the second capacitor C2 is V. o2 DC-DC converter voltage V bus =V o1 +V o2 The second terminal of the first three-terminal regulator 33 outputs an auxiliary voltage VCC1, and the second terminal of the second three-terminal regulator 34 outputs an auxiliary voltage VCC2.

[0067] As an example, the first three-terminal regulator 33 uses a three-terminal regulator chip, and the three-terminal regulator chip model includes: LM7815.

[0068] As an example, the second three-terminal regulator 34 uses a three-terminal regulator chip, and the three-terminal regulator chip model includes: LM7805.

[0069] As an example, the auxiliary voltage VCC1 is 15V.

[0070] As an example, the auxiliary voltage VCC2 is 5V.

[0071] For example, please refer to Figure 3 , Figure 3 The circuit diagram is for the first step-down module 4, which includes: a third switch S3, a fourth switch S4, a first inductor L1, a third capacitor C3, a feedback resistor R0, and a feedback resistor R. f A reference comparator 41 and a power driver 42. The first terminal of the third switch S3 is connected to the first terminal of the fourth switch S4 and the first terminal of the first inductor L1. The second terminal of the first inductor L1 is connected to the first terminal of the third capacitor C3 and the first terminal of the feedback resistor R0. The second terminal of the fourth switch S4 is connected to the second terminal of the third capacitor C3 and the feedback resistor R0. f The first terminal is connected, and the second terminal of the feedback resistor R0 is connected to the feedback resistor R. f The second terminal of the reference comparator 41 is connected to the first terminal of the reference comparator 41. The second terminal of the reference comparator 41 is connected to the first terminal of the power driver 42. The second terminal of the power driver 42 is connected to the third terminal of the third switch S3 and the third terminal of the fourth switch S4. The first terminal of the third switch S3 is the first terminal of the first step-down module 4. The first and second terminals of the feedback resistor R0 constitute the second terminal of the first step-down module 4. The first terminal of the reference comparator 41 is the third terminal of the first step-down module 4.

[0072] As an example, the first terminal of the third switch S3 receives the DC-DC conversion voltage V. bus .

[0073] As an example, the voltage detected by the feedback resistor R0 is the output voltage V. out .

[0074] As an example, the first terminal of the reference comparator 41 receives the reference voltage V. ref and reference current I ref .

[0075] As an example, the power driver 42 uses a power driver chip, and the models of the power driver chips include: NCP1034, EG1163, and EG1162.

[0076] As an example, the connection method of the second step-down module 5 is the same as that of the first step-down module 4, and will not be described again here.

[0077] As an example, the output voltage V out The first output voltage V out1 .

[0078] As an example, the output voltage V out It can also be used as a second output voltage V out2 .

[0079] As an example, the microcontroller module 7 includes: a charge / stop control unit 71 and a protection unit 72. Figure 1 (Not shown in the image), the first terminal of the charge / stop control unit 71 is the first terminal of the microcontroller module 7, the second terminal of the charge / stop control unit 71 is the second or third terminal of the microcontroller module 7, the third terminal of the charge / stop control unit 71 is the fourth terminal of the microcontroller module 7, and the fourth terminal of the charge / stop control unit 71 is the fifth terminal of the microcontroller module 7; the first terminal of the protection unit 72 is the second or third terminal of the microcontroller module 7, and the second terminal of the protection unit 72 is the fourth terminal of the microcontroller module 7.

[0080] As an example, the microcontroller module 7 includes two identical charge / stop control units 71, the second terminals of which are either the second or third terminals of the microcontroller module 7.

[0081] As an example, the microcontroller module 7 includes two identical protection units 72, the first ends of which are the second or third ends of the microcontroller module 7, respectively.

[0082] Please see Figure 4 , Figure 4 The circuit diagram for the charge stop control unit 71 is shown below. The charge stop control unit 71 includes: a third diode D3, a fourth diode D4, a fifth diode D5, a first comparator U1, a second comparator U2, a fourth capacitor C4, a transistor VT1, a first light-emitting diode LED1, a second light-emitting diode LED2, and a second DC power supply V. dc2 and the first resistor R1 to the eleventh resistor R 11The first terminal of the first resistor R1 is connected to the first terminal of the second resistor R2. The second terminal of the first resistor R1 is connected to the negative input terminal of the first comparator U1 and the anode of the fifth diode D5. The cathode of the fifth diode D5 is grounded. The first terminal of the second resistor R2 is connected to the first terminal of the third resistor R3, the first terminal of the fourth resistor R4, and the anode of the third diode D3. The second terminal of the second resistor R2 is connected to the anode of the first light-emitting diode LED1. The cathode of the first light-emitting diode LED1 is connected to the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the anode of the second light-emitting diode LED2. The cathode of the second light-emitting diode LED2 is connected to the cathode of the fifth diode D5, the first terminal of the fourth capacitor C4, and the first terminal of the eighth resistor R8. The second terminal of the third resistor R3 is connected to the positive input terminal of the second comparator U2, the second terminal of the eighth resistor R8, and the tenth resistor R1. 10 The first terminal is connected to the tenth resistor R. 10 The second terminal is connected to the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is connected to the second terminal of the fourth capacitor C4; the cathode of the third diode D3 is connected to the anode of the fourth diode D4, the second terminal of the fourth resistor R4 is connected to the cathode of the fourth diode D4, the first terminal of the fifth resistor R5 and the first terminal of the transistor VT1, and the second terminal of the transistor VT1 is connected to the first terminal of the sixth resistor R6 and the second DC power supply V. dc2 The first terminal is connected to the second DC power supply V. dc2 The second terminal and the eleventh resistor R 11 First terminal and eleventh resistor R 11 The second terminal is connected to the eleventh resistor R. 11 The third terminal is connected to the second terminal of the sixth resistor R6, and the eleventh resistor R 11 The first terminal of transistor VT1 is connected to the positive input terminal of the first comparator U1, the output terminal of the first comparator U1 is connected to the negative input terminal of the second comparator U2, and the output terminal of the second comparator U2 is connected to the second terminal of the fifth resistor R5. The second terminals of transistor VT1 are the first and second terminals of the charge-stop control unit 71, respectively. The first terminal of the first resistor R1 is the third terminal of the charge-stop control unit 71. The charge-stop signals of the first LED1 and the second LED2 are transmitted through the third terminal of the charge-stop control unit 71, and the first terminal of transistor VT1 is the fourth terminal of the charge-stop control unit 71.

[0083] As an example, the first terminal of the first resistor R1 receives the output voltage V. out .

[0084] As an example, the first terminal of the sixth resistor R6 receives the auxiliary voltage VCC1 provided by the DC-DC converter module 3.

[0085] As an example, the second terminal of transistor VT1 outputs a pulse width modulation signal PWM3.

[0086] As an example, the second DC power supply V dc2 An auxiliary voltage VCC1 is provided, which, together with the auxiliary voltage VCC1 provided by the DC-DC converter module 3, provides a stable power supply for the charge / stop control unit 71.

[0087] Please see Figure 5 , Figure 5 This is a circuit diagram of protection unit 72. Protection unit 72 includes: a circuit breaker protection structure 721, an over-temperature protection structure 722, an over-current protection structure 723, an over-voltage protection structure 724, and an alarm structure 725. The first terminals of the circuit breaker protection structure 721, the over-temperature protection structure 722, the over-current protection structure 723, and the over-voltage protection structure 724 are respectively connected to the first terminal of the alarm structure 725. The second terminal of the circuit breaker protection structure 721 is connected to the second terminal of the over-temperature protection structure 722. The third terminal of the over-temperature protection structure 722 is connected to the second terminal of the over-current protection structure 723. The third terminal of the over-current protection structure 723 is connected to the second terminal of the over-voltage protection structure 724. The third end of the circuit breaker protection structure 721, the fourth end of the over-temperature protection structure 722, and the fourth end of the over-current protection structure 723 are the first end of the protection unit 72. The third end of the overvoltage protection structure 724 and the third end of the alarm structure 725 are the second end of the protection unit 72. The second end of the alarm structure 725 is the first end of the protection unit 72.

[0088] As an example, the circuit breaker structure 721 includes: a twelfth resistor R 12 The thirteenth resistor R 13 Fourteenth resistor R 14 The third comparator U3 and the twenty-first resistor R 21 The twelfth resistor R 12 The first terminal is connected to the DC-DC converter voltage V. bus The twelfth resistor R 12 The second terminal and the thirteenth resistor R 13 The first terminal and the positive input terminal of the third comparator U3 are connected, and the thirteenth resistor R is connected. 13 The second terminal is grounded, and the negative input terminal of the third comparator U3 is connected to the fourteenth resistor R. 14 The first terminal is connected to the fourteenth resistor R. 14 The second terminal is connected to the auxiliary voltage VCC2, and the output of the third comparator U3 is connected to the twenty-first resistor R. 21 The first terminal of the first comparator is connected to the ground, the fourth terminal of the third comparator U3 is connected to the auxiliary voltage VCC2, and the fifth terminal of the third comparator U3 is grounded. The fourteenth resistor R... 14 The first terminal is the second terminal of the circuit breaker protection structure 721, and the twenty-first resistor R 21The second terminal is the first terminal of the circuit breaker protection structure 721, and the twelfth resistor R 12 The first end is the third end of the circuit breaker protection structure 721.

[0089] As an example, the connection methods of the over-temperature protection structure 722, over-current protection structure 723, and over-voltage protection structure 724 are the same as those of the circuit breaker protection structure 721, and will not be repeated here. The difference between the circuit breaker protection structure 721 and the over-temperature protection structure 722, over-current protection structure 723, and over-voltage protection structure 724 lies in the sixteenth resistor R. 16 The first terminal, i.e., the fourth terminal of the over-temperature protection structure 722, is connected to the auxiliary voltage VCC2, and the seventeenth resistor R 17 The first terminal, i.e., the fourth terminal of the overcurrent protection structure 723, is connected to the output current I. out The twenty-ninth resistor R 29 The first terminal, i.e., the third terminal of the overvoltage protection structure 724, is connected to the output voltage V. out The overvoltage protection structure 724 also includes: the twenty-first resistor R 21 The twenty-first resistor R 21 The first terminal and the twentieth resistor R 20 The second terminal is connected to the twenty-first resistor R. 21 The second end is grounded.

[0090] As an example, the negative input terminal of the third comparator U3 receives voltage V. a The negative input terminal of the fourth comparator U4 receives voltage V. b The negative input terminal of the fifth comparator U5 receives voltage V. c The negative input terminal of the sixth comparator U6 receives voltage V. d .

[0091] As an example, the output current I out It can be the first output voltage I out1 .

[0092] As an example, the output voltage I out It can also be used as the second output voltage I out2 .

[0093] As an example, alarm structure 725 includes: OR gate OR1, and a twenty-sixth resistor R. 26 The twenty-seventh resistor R 27 The twenty-eighth resistor R 28 The components include: LED3 (third LED), S5 (fifth switch), D6 (sixth diode), BUZZER (active buzzer), and RY1 (relay). The first terminal of OR1 is connected to the twenty-sixth resistor R. 26 and the twenty-seventh resistor R 27 The first terminal is connected to the twenty-sixth resistor R. 26The second terminal is connected to the anode of the third LED (LED3), and the cathode of the third LED (LED3) is connected to the twenty-eighth resistor R. 28 The first terminal of the first switch and the first terminal of the fifth switch S5 are connected to ground, and the twenty-eighth resistor R 28 The second terminal and the twenty-seventh resistor R 27 The second terminal of the relay is connected to the second terminal of the fifth switch S5. The third terminal of the fifth switch S5 is connected to the first terminal of the relay RY1, the anode of the sixth diode D6, and the first terminal of the active buzzer BUZZER. The second terminal of the relay RY1 is connected to the cathode of the sixth diode D6, the second terminal of the active buzzer BUZZER, and the auxiliary voltage VCC2. The third terminal of the relay RY1 is connected to the positive output voltage V. out+ The fourth terminal of relay RY1 is connected to the first terminal of feedback resistor R0, meaning relay RY1 is connected in series between the second terminal of the step-down module and the battery load. The second, third, fourth, and fifth terminals of OR gate OR1 are the first terminals of alarm structure 725, and the third and fourth terminals of relay RY1 constitute the second terminal of alarm structure 725. The fault signal of the third LED3 is transmitted through the third terminal of alarm structure 725.

[0094] For example, please refer to Figure 6 , Figure 6 This is a circuit diagram of pulse width modulation module 6. Pulse width modulation module 6 includes: the thirty-first resistor R. 31 The thirty-second resistor R 32 The thirty-third resistor R 33 The thirty-fourth resistor R 34 The components include: fifth capacitor C5, sixth capacitor C6, sixth switch S6, seventh comparator U7, and eighth comparator U8. The twenty-ninth resistor R... 31 The first terminal of the circuit is connected to the first terminal of the sixth switch S6, the second terminal of the sixth switch S6 is connected to the positive input terminal of the seventh comparator U7, and the third terminal of the sixth switch S6 is connected to the thirty-third resistor R. 33 The first terminal is connected to ground, and the thirty-third resistor R 33 The second terminal and the thirty-second resistor R 32 The first end is connected to the thirty-second resistor R. 32 The second terminal is connected to the first terminal of the fifth capacitor C5, and the second terminal of the fifth capacitor C5 is grounded; the negative input terminal of the seventh comparator U7 is connected to the output terminal of the seventh comparator U7 and the thirty-fourth resistor R. 34 The first end is connected to the thirty-fourth resistor R. 34 The second terminal is connected to the first terminal of the sixth capacitor C6 and the positive input terminal of the eighth comparator U8, and the negative input terminal of the eighth comparator U8 is connected to the output terminal of the eighth comparator U8; the second terminal of the sixth capacitor C6 is grounded. The thirty-first resistor R 31The second terminal is the third terminal of the pulse width modulation module 6, and the output terminal of the eighth comparator U8 is the second and third terminals of the pulse width modulation module 6.

[0095] As an example, the thirty-first resistor R 31 The second terminal receives the pulse width modulation signal PWM3.

[0096] As an example, the output of the eighth comparator U8 outputs a reference voltage V. ref and reference current I ref .

[0097] As an example, the output voltage detection module 8 uses a series resistor for output voltage detection.

[0098] As an example, the output voltage detection module 8 can also be integrated into the overvoltage protection structure 724 of the protection unit 72, that is, through the twenty-ninth resistor R. 29 and the thirtieth resistor R 30 Output voltage detection is performed, at which point the 29th resistor R... 29 The first terminals are the second and third terminals of the output voltage detection module 8, respectively, and the twenty-ninth resistor R 29 The second terminal is the first terminal of the output voltage detection module 8.

[0099] As an example, the intelligent communication module 9 uses a communication chip for communication. The first terminal of the intelligent communication module 9 outputs a command signal to the fifth terminal of the microcontroller module 7. The second terminal of the intelligent communication module 9 receives the fault and charging / power-off signals output by the fourth terminal of the microcontroller module 7. The auxiliary voltages VCC1 and VCC2 power the built-in battery of the intelligent communication module 9 through the third terminal of the intelligent communication module 9.

[0100] For example, the models of communication chips include: ESP8266, ESP32-WROOM-32, and CC3200R1M1.

[0101] For example, please refer to Figure 7 , Figure 7 This is a circuit diagram of the cooling fan drive module 10. The cooling fan drive module 10 includes: a thirty-fifth resistor R. 35 The thirty-sixth resistor R 36 The thirty-seventh resistor R 37 The thirty-eighth resistor R 38 The thirty-ninth resistor R 39 The components include: seventh switch S7, eighth switch S8, seventh diode D7, eighth diode D8, seventh capacitor C7, and cooling fan 101. The thirty-fifth resistor R... 35 The first terminal is connected to the first terminal of the seventh switch S7 and the auxiliary voltage VCC1, and the thirty-fifth resistor R 35The second terminal and the thirty-sixth resistor R 36 The first terminal is connected to the second terminal of the seventh switch S7, and the third terminal of the seventh switch S7 is connected to the first terminal of the seventh capacitor C7 and the thirty-seventh resistor R. 37 The first terminal, auxiliary voltage VCC2, and the first terminal of cooling fan 101 are connected; the thirty-sixth resistor R 36 The second terminal is connected to the cathode of the seventh diode D7, and the anode of the seventh diode D7 is connected to the second terminal of the seventh capacitor C7 and the thirty-ninth resistor R. 39 The first terminal of the eighth switch S8 and the second terminal of the cooling fan 101 are connected, and the thirty-ninth resistor R is connected. 39 The second terminal and the thirty-eighth resistor R 38 The first end is connected to the thirty-eighth resistor R. 38 The second terminal is connected to the second terminal of the eighth switch S8, the third terminal of the eighth switch S8 is connected to the anode of the eighth diode D8, and the cathode of the eighth diode D8 is connected to the thirty-seventh resistor R. 37 The second end is connected. The thirty-fifth resistor R 35 The first terminal of the capacitor and the first terminal of the seventh capacitor C7 constitute the first terminal of the cooling fan drive module 10.

[0102] Specifically, the thirty-fifth resistor R 35 The first terminal of the capacitor is connected to the second terminal of the first three-terminal regulator 33, and the first terminal of the seventh capacitor C7 is connected to the second terminal of the second three-terminal regulator 34.

[0103] The following will continue to combine Figures 1 to 7 The working principle of the multi-channel charging circuit provided in this application is introduced.

[0104] Electromagnetic interference suppression module 1 is used to suppress electromagnetic interference. Its main purpose is to attenuate noise at different frequencies to meet electromagnetic compatibility (EMC) requirements.

[0105] The rectifier module 2 converts AC power into DC power, reducing voltage fluctuations and providing a more stable DC voltage.

[0106] Furthermore, the input voltage is filtered and rectified by the anti-electromagnetic interference module 1 and the rectifier module 2 and then used as the input source of the DC-DC converter module 3. The DC-DC converter module 3 is a quasi-resonant flyback circuit with high power factor correction and soft switching function.

[0107] The DC-DC converter module 3 utilizes primary-side feedback (PSR) technology to detect the voltage and current of the first switch S1, enabling it to switch on at the valley of the voltage across the first switch S1, thereby achieving soft switching and high power factor regulation. Furthermore, after rectification by the ripple-reducing controller 32, the first three-terminal regulator 33, and the second three-terminal regulator 34, a stable first DC-DC converter voltage V is output.bus The auxiliary voltages VCC1 and VCC2 supply power to the subsequent first step-down module 4, second step-down module 5, intelligent communication module 9, and cooling fan drive module 10.

[0108] As an example, in one embodiment of this application, the input voltage is 220V, 50Hz.

[0109] Further, please refer to Figure 8 , Figure 8 This is a control block diagram of the ripple reduction controller 32. The ripple reduction controller 32 utilizes the design concept of energy distribution and power feedback, and detects the first DC-DC conversion voltage V of the main output circuit. o1 The first DC-DC converter detection voltage V is obtained. o1.sense By detecting the second DC-DC converter voltage V of the main output circuit o2 The second DC-DC converter detection voltage V is obtained. o2.sense ;Detection voltage V of the first DC-DC converter o1.sense Perform filtering sampling to remove the DC component, and invert the AC component before applying it to the bias voltage V. bias The second DC-DC converter voltage V is obtained by performing a subtraction operation. o2 The second DC-DC converter voltage V o2 With the second DC-DC converter detection voltage V o2.sense Perform subtraction operation on the second DC-DC converter detection voltage V o2.sense The output ripple is regulated to obtain the second DC-DC converter base voltage V. o2.base After further proportional-integral (PI) regulation, the reverse second DC converter base voltage V is ensured. o2.base To ensure stability and avoid changes in the first DC-DC converter detection voltage V due to load variations. o1.sense Ripple fluctuations negate the cancellation effect. Furthermore, regarding the second DC-DC converter base voltage V... o2.base After nonlinear processing, the signal is limited by a proportional coefficient of 0.5 and then subjected to nonlinear processing again. The signal is then chopped with a sawtooth wave of the same frequency as that emitted by the ripple removal controller 32. The chopped signal is then XORed with the first pulse width modulation signal PWM1 output by the primary-side feedback controller 31 to obtain the second pulse width modulation signal PWM2 that controls the second switch S2 to turn on. o2 The extraction and cancellation of ripple voltage achieves the functions of eliminating large electrolytic capacitors and ripple suppression, while the first DC-DC conversion voltage V of the main output circuit... o1 The high-frequency ripple of the output is controlled by the second DC-DC converter voltage V. o2The reverse high-frequency ripple at the output is canceled out, resulting in very low output voltage ripple, reducing damage to the battery load and extending its lifespan. The primary function of the first capacitor C1 is to buffer the unbalanced power from input to output, while the second capacitor C2 balances the ripple. Longer-life, smaller film capacitors or ceramic capacitors can be selected to eliminate the need for large electrolytic capacitors in the design.

[0110] The main circuitry of the first buck module 4 and the second buck module 5 is a buck circuit, and the current modulation strategy is closed-loop pulse width modulation. The first buck module 4 and the second buck module 5 add current regulation to the voltage regulation, using a digital signal from the power driver 42 to control the current reference value, thus improving the accuracy of current regulation. A more efficient dual-switch "Mos+Mos" synchronous buck structure is adopted, sampling the output current I... out With the set reference current I ref After comparison and PI adjustment, the error signal is input into the reference comparator 41 as feedback. The feedback signal is transmitted from the inverting input terminal of the reference comparator 41 to the power driver 42 to control the pulse width modulation of the third switch S3 and the fourth switch S4.

[0111] As an example, the principle of voltage regulation is the same as that of current regulation, and will not be repeated here.

[0112] The charging stop control unit 71 detects the output voltage V out The system implements charging and stopping control for the battery load. When the battery load is charging, the voltage across its terminals is very low. At this time, the first comparator U1 is at a low level, and the second comparator U2 is oscillating. The second comparator U2 outputs a rectangular wave of approximately 100Hz, which, through transistor VT1, outputs a third pulse width modulation (PWM) signal to drive the first buck module 4 and the second buck module 5 to perform pulsed constant current charging on the battery load. When the voltage across the battery load reaches a predetermined value, the first comparator U1 outputs a high level, the second comparator U2 stops oscillating and outputs a high level, transistor VT1 is turned off, and charging stops. At this time, a constant voltage power supply is provided to the battery load.

[0113] As an example, the first light-emitting diode LED1 lighting up alone indicates a charging signal, and the second light-emitting diode LED2 lighting up alone indicates a stop charging signal.

[0114] In protection unit 72, the first terminals of circuit breaker protection structure 721, over-temperature protection structure 722, over-current protection structure 723, and over-voltage protection structure 724 are respectively connected to the second, third, fourth, and fifth terminals of OR gate OR1. When any one of the inputs of the second, third, fourth, and fifth terminals of OR gate OR1 is a high-level signal, the first terminal of OR gate OR1 outputs a high-level signal. That is, when battery charging experiences any of the following: overcurrent, overvoltage, circuit breaker, or over-temperature, OR gate OR1 outputs a high-level signal. When OR gate OR1 outputs a high-level signal, the fifth switch S5 is turned on, energizing the control terminal of relay RY1, which in turn causes relay RY1 to disconnect, thereby disconnecting the connection between the first step-down module 4 or the second step-down module 5 and the battery load, stopping the charging of the battery load, and preventing damage to the battery load. At the same time, the active buzzer in alarm structure 725 sounds an alarm, and the third light-emitting diode LED3 remains constantly lit as a fault signal.

[0115] The pulse width modulation module 6 receives the third pulse width modulation signal PWM3 output from the microcontroller module 7, which is then sequentially chopped by the sixth switch S6 and passed through the thirty-second resistor R. 32 The fifth capacitor C5 is used for compensation, the seventh comparator U7 forms a voltage follower for buffering, and the thirty-fourth resistor R... 34 The sixth capacitor C6 compensates for the output voltage with a certain amplitude and duty cycle, which is then passed through the eighth comparator U8 to form a voltage follower, outputting the reference voltage V. ref and reference current I ref Input the first buck module 4 and the second buck module 5 for benchmark comparison.

[0116] Output voltage detection module 8 is used to acquire output voltage V out The voltage signal is fed back to the charging / stop control unit 71 and protection unit 72 of the microcontroller module 7. The microcontroller module 7 then feeds back fault and charging / stop signals to the intelligent communication module 9 to complete the output voltage V. out Real-time detection.

[0117] The intelligent communication module 9 charges its built-in battery using the auxiliary voltage from the DC-DC converter module 3, enabling it to operate independently even when power is off. The intelligent communication module 9 remotely receives command signals and transmits them to transistor VT1 in the charge / stop control unit 71 of the microcontroller module 7. Upon receiving the command signal, transistor VT1 adjusts and outputs a third pulse width modulation signal (PWM3), which, via the pulse width modulation module 6, controls the reference voltage V. ref and reference current I ref It then participates in the current and voltage regulation of the first step-down module 4 and the second step-down module 5.

[0118] Furthermore, when a fault such as open circuit, overvoltage, overcurrent, or overtemperature occurs in the multi-channel charging circuit, the microcontroller module 7 sends a fault signal to the intelligent communication module 9. After receiving the fault signal, the intelligent communication module 9 sends a fault feedback signal to the remote control terminal and realizes the remote alarm function.

[0119] Furthermore, the intelligent communication module 9 receives charging and stopping signals, including charging signals and stopping signals, and feeds them back to the remote control terminal. It receives command signals to start charging or stop charging, and then the intelligent communication module 9 outputs command signals to the transistor VT1 of the charging and stopping control unit 71 of the microcontroller module 7. The microcontroller module 7 then completes the charging and stopping control of the multi-channel charging circuit.

[0120] When the power supply is connected to the multi-channel charging circuit and it is working normally, the auxiliary voltage VCC1 and auxiliary voltage VCC2 supply power to the cooling fan 101 of the cooling fan drive module 10, and the cooling fan 101 works normally to dissipate heat for the multi-channel charging circuit.

[0121] In another embodiment of this application, please refer to Figure 9 , Figure 9 This application also provides a multi-channel charging power supply, including: a power supply housing 91 and a circuit board 99. Figure 9 (Not shown in the image), a multi-channel charging circuit as described above is integrated on circuit board 99.

[0122] As an example, at one end of the power supply casing 91, a power cord 94 is provided, with the live wire 941 and neutral wire 942 of the power cord 94 soldered to the positive and negative terminals of the circuit board 99, respectively; multiple heat dissipation holes 95 are provided on the left and right sides of the power supply casing 91; two sets of power output lines are provided on the other side of the power supply casing 91, including a first power output line 92 and a second power output line 93, which are directly connected to the battery load; multiple ventilation holes 96 are provided at the wire insertion points at both ends of the power supply casing 91, and mounting grooves are provided at the bottom of the fan-shaped area at the wire insertion points at both ends of the power supply casing 91. Figure 9 (Not shown in the image), the mounting slot is fixed by a slot or screw; an indicator light 97 is provided on the power housing 91 on the left or right side of the power cord 94; a buzzer alarm window 98 is provided at one end of the power housing 91, which is connected to both ends of the power housing 91 and the end with the indicator light 97.

[0123] As an example, the battery load includes a first battery load and a second battery load.

[0124] As an example, one end of the power cord 94 is connected to the power supply, and the other end of the power cord 94 is connected to the second end of the electromagnetic interference suppression module 1.

[0125] As an example, the first power output line 92 includes a first positive power output line 921 and a first negative power output line 922, and the second power output line 93 includes a second positive power output line 931 and a second negative power output line 932. One end of the first power output line 92 is connected to the second end of the first step-down module 4, and the other end of the first power output line 92 is connected to the first battery load; one end of the second power output line 93 is connected to the second end of the second step-down module 5, and the other end of the second power output line 93 is connected to the second battery load.

[0126] As an example, a heat dissipation module is soldered inside the circuit board 99. A heat-conducting plate is connected to the lower end of the heat dissipation module, and a capacitor is set at the upper end of the heat-conducting plate. An integrated module is set at one end of the capacitor, and the integrated module integrates a multi-channel charging circuit as described above.

[0127] As an example, the internal structure of the heat dissipation module features equidistantly arranged heat sinks. A rotating shaft is fixed above the heat sinks via a fixing rod, and the shaft is driven by an AC micro motor. An external support frame is mounted on the heat dissipation module. A ring is welded to the inner side of the support frame, and a fixing rod is located inside the ring. The rotating shaft is fixed inside the fixing rod, and blades are connected to the outer side of the rotating shaft. Two heat-conducting fins extend from the lower end of the heat dissipation module. These fins are rectangular copper sheets, 2-5mm thick, and their branch ends are welded around the transformer and integrated module.

[0128] As an example, the cooling fan drive module 10 of the multi-channel charging circuit described above can be integrated into the cooling module. In this case, the cooling fan 101 is a heat sink arranged at equal intervals inside the cooling module.

[0129] The multi-channel charging circuit and multi-channel charging power supply provided in this application have remote alarm and control functions, improve the load-carrying power of the multi-channel charging circuit and multi-channel charging power supply, realize independent charging of two battery loads with different power, expand the application range, and meet more complex application scenarios; at the same time, it improves safety and stability, reduces the damage of current and voltage ripple to battery loads, realizes alarm feedback for working faults through a built-in independent intelligent communication module, and can remotely and manually adjust the charging current and charging / stopping of battery loads according to battery load requirements, user habits, or specific scenario needs; furthermore, it extends the service life of the multi-channel charging circuit and multi-channel charging power supply, reduces the size of the multi-channel charging circuit and multi-channel charging power supply, and improves working efficiency; it solves the problems of poor heat dissipation, weak anti-interference ability, single power charging, and large charging current and voltage ripple that lead to short battery load life in traditional equipment, and is especially suitable for occasions such as factory processing workshops where frequent battery replacement and charging are required.

[0130] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A multi-channel charging circuit, characterized in that, include, Electromagnetic interference suppression module The rectifier module is connected at its first end to the first end of the electromagnetic interference suppression module. A DC-DC converter module, the first terminal of which is connected to the second terminal of the rectifier module; The first step-down module has a first terminal connected to the second terminal of the DC-DC converter module, and the second terminal of the first step-down module is connected to the first output voltage. The second step-down module has its first terminal connected to the second terminal of the DC-DC converter module, and its second terminal connected to the second output voltage. A pulse width modulation module, wherein the first terminal of the pulse width modulation module is connected to the third terminal of the first buck module, and the second terminal of the pulse width modulation module is connected to the third terminal of the second buck module; The microcontroller module has its first terminal connected to the third terminal of the pulse width modulation module, its second terminal connected to the second terminal of the first buck module, and its third terminal connected to the second terminal of the second buck module. The output voltage detection module has its first terminal connected to the fourth terminal of the microcontroller module, its second terminal connected to the second terminal of the first step-down module, and its third terminal connected to the second terminal of the second step-down module. The intelligent communication module has its first terminal connected to the fifth terminal of the microcontroller module, its second terminal connected to the fourth terminal of the microcontroller module, and its third terminal connected to the third terminal of the DC-DC converter module.

2. The multi-channel charging circuit as described in claim 1, characterized in that, Also includes: The cooling fan drive module has its first end connected to the third end of both the DC-DC converter module and the intelligent communication module.

3. The multi-channel charging circuit as described in claim 1, characterized in that, The DC-DC converter module includes: a primary-side feedback controller, a ripple reduction controller, a transformer, a first three-terminal regulator, a second three-terminal regulator, a first switch, a second switch, a first diode, a second diode, a first capacitor, and a second capacitor. The transformer includes: a primary winding, a secondary winding, a secondary winding, a primary winding, and a secondary winding. The first end of the primary winding is connected to the first end of the primary feedback controller, and the second end of the primary winding is connected to the first end of the first switch. The second end of the first switch and the first end of the primary winding are connected in parallel with the first DC power supply. The first end of the primary winding is connected to the second end of the primary feedback controller, and the second end of the primary winding is grounded after being connected to the first end of the primary winding. The first end of the secondary winding is connected to the anode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, and the second end of the secondary winding is connected to the second end of the first capacitor. The first end of the secondary winding is connected to the anode of the second diode. The cathode of the second diode is connected to the first terminal of the second switch, the second terminal of the second switch is connected to the first terminal of the second capacitor, and the second terminal of the secondary winding is connected to the second terminal of the second capacitor. The first terminal of the first capacitor and the second terminal of the second diode are respectively connected to the first terminal of the ripple reduction controller, and the second terminal of the ripple reduction controller is connected to the second terminal of the second switch. The secondary winding is connected in parallel with the first terminal of the first three-terminal voltage regulator, and the second terminal of the first three-terminal voltage regulator is connected in parallel with the first terminal of the second three-terminal voltage regulator. The primary winding is connected in parallel with the secondary winding and the secondary winding is connected in parallel. The second terminal of the first switch and the first terminal of the primary winding constitute the first terminal of the DC-DC converter module. The first terminal of the first capacitor and the second terminal of the second capacitor constitute the second terminal of the DC-DC converter module. The second terminals of the first three-terminal regulator and the second three-terminal regulator are the third terminals of the DC-DC converter module.

4. The multi-channel charging circuit as described in claim 3, characterized in that, The first buck module and the second buck module each include: a third switch, a fourth switch, a first inductor, a third capacitor, a first feedback resistor, a second feedback resistor, a reference comparator, and a power driver; The first terminal of the third switch is connected to the first terminal of the fourth switch and the first terminal of the first inductor. The second terminal of the first inductor is connected to the first terminal of the third capacitor and the first terminal of the first feedback resistor. The second terminal of the fourth switch is connected to the second terminal of the third capacitor and the first terminal of the second feedback resistor. The second terminal of the first feedback resistor is connected to the second terminal of the second feedback resistor and the first terminal of the reference comparator. The second terminal of the reference comparator is connected to the first terminal of the power driver. The second terminal of the power driver is connected to the third terminal of the third switch and the third terminal of the fourth switch, respectively. The first terminal of the third switch is the first terminal of the first buck module or the second buck module, the first and second terminals of the first feedback resistor constitute the second terminal of the first buck module or the second buck module, and the first terminal of the reference comparator is the third terminal of the first buck module or the second buck module.

5. The multi-channel charging circuit as described in claim 4, characterized in that, The microcontroller module includes: a charge / stop control unit and a protection unit. The first terminal of the charge / stop control unit is the first terminal of the microcontroller module, the second terminal of the charge / stop control unit is either the second or third terminal of the microcontroller module, the third terminal of the charge / stop control unit is the fourth terminal of the microcontroller module, and the fourth terminal of the charge / stop control unit is the fifth terminal of the microcontroller module. The first terminal of the protection unit is either the second or third terminal of the microcontroller module, and the second terminal of the protection unit is the fourth terminal of the microcontroller module.

6. The multi-channel charging circuit as described in claim 5, characterized in that, The charging / stop control unit includes: a third diode, a fourth diode, a fifth diode, a first comparator, a second comparator, a fourth capacitor, a transistor, a first light-emitting diode, a second light-emitting diode, a second DC power supply, and first to eleventh resistors; The first terminal of the first resistor is connected to the first terminal of the second resistor. The second terminal of the first resistor is connected to the negative input terminal of the first comparator and the anode of the fifth diode. The cathode of the fifth diode is grounded. The first terminal of the second resistor is connected to the first terminal of the third resistor, the first terminal of the fourth resistor, and the anode of the third diode. The second terminal of the second resistor is connected to the anode of the first LED. The cathode of the first LED is connected to the first terminal of the seventh resistor. The second terminal of the seventh resistor is connected to the anode of the second LED. The cathode of the second LED is connected to the cathode of the fifth diode, the first terminal of the fourth capacitor, and the first terminal of the eighth resistor. The second terminal of the third resistor is connected to the positive input terminal of the second comparator, the second terminal of the eighth resistor, and the first terminal of the tenth resistor. The second terminal of the tenth resistor is connected to the first terminal of the ninth resistor, and the second terminal of the ninth resistor is connected to the second terminal of the fourth capacitor; the cathode of the third diode is connected to the anode of the fourth diode, the second terminal of the fourth resistor is connected to the cathode of the fourth diode, the first terminal of the fifth resistor and the first terminal of the transistor, the second terminal of the transistor is connected to the first terminal of the sixth resistor and the first terminal of the second DC power supply, the second terminal of the second DC power supply is connected to the first terminal of the eleventh resistor and the second terminal of the eleventh resistor, the third terminal of the eleventh resistor is connected to the second terminal of the sixth resistor, the first terminal of the eleventh resistor is connected to the positive input terminal of the first comparator, the output terminal of the first comparator is connected to the negative input terminal of the second comparator, and the output terminal of the second comparator is connected to the second terminal of the fifth resistor; The second terminals of the transistor are the first and second terminals of the charge-stop control unit, respectively. The first terminal of the first resistor is the third terminal of the charge-stop control unit. The charge-stop signals of the first and second LEDs are transmitted through the third terminal of the charge-stop control unit. The first terminal of the transistor is the fourth terminal of the charge-stop control unit.

7. The multi-channel charging circuit as described in claim 5, characterized in that, The protection unit includes: circuit breaking protection structure, over-temperature protection structure, over-current protection structure, over-voltage protection structure, and alarm structure; The first ends of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, and over-voltage protection structure are respectively connected to the first end of the alarm structure. The second end of the circuit breaker protection structure is connected to the second end of the over-temperature protection structure. The third end of the over-temperature protection structure is connected to the second end of the over-current protection structure. The third end of the over-current protection structure is connected to the second end of the over-voltage protection structure. The third end of the circuit breaker protection structure, the fourth end of the over-temperature protection structure, and the fourth end of the over-current protection structure are the first ends of the protection unit. The third end of the over-voltage protection structure and the third end of the alarm structure are the second ends of the protection unit. The second end of the alarm structure is the first end of the protection unit.

8. The multi-channel charging circuit as described in claim 7, characterized in that, The circuit breaker protection structure, over-temperature protection structure, over-current protection structure, and over-voltage protection structure respectively include: the twelfth resistor, the thirteenth resistor, the fourteenth resistor, the third comparator, and the twenty-first resistor; The first terminal of the twelfth resistor is connected to the DC-DC converter voltage. The second terminal of the twelfth resistor is connected to the first terminal of the thirteenth resistor and the positive input terminal of the third comparator. The second terminal of the thirteenth resistor is grounded. The negative input terminal of the third comparator is connected to the first terminal of the fourteenth resistor. The second terminal of the fourteenth resistor is connected to the auxiliary voltage. The output terminal of the third comparator is connected to the first terminal of the twenty-first resistor. The fourth terminal of the third comparator is connected to the auxiliary voltage. The fifth terminal of the third comparator is grounded. The first terminal of the fourteenth resistor is the second terminal of the circuit breaker protection structure. The second terminal of the twenty-first resistor is the first terminal of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, or over-voltage protection structure. The first terminal of the twelfth resistor is the third terminal of the circuit breaker protection structure, over-temperature protection structure, over-current protection structure, or over-voltage protection structure.

9. The multi-channel charging circuit as described in claim 7, characterized in that, The alarm structure includes: an OR gate, a 26th resistor, a 27th resistor, a 28th resistor, a 3rd LED, a 5th switch, a 6th diode, an active buzzer, and a relay; The first terminal of the OR gate is connected to the first terminals of the 26th and 27th resistors. The second terminal of the 26th resistor is connected to the anode of the third LED. The cathode of the third LED is connected to the first terminal of the 28th resistor and the first terminal of the fifth switch and grounded. The second terminal of the 28th resistor is connected to the second terminal of the 27th resistor and the second terminal of the fifth switch. The third terminal of the fifth switch is connected to the first terminal of the relay, the anode of the 6th diode, and the first terminal of the active buzzer. The second terminal of the relay is connected to the cathode of the 6th diode, the second terminal of the active buzzer, and the auxiliary voltage. The third terminal of the relay is connected to the positive output voltage. The fourth terminal of the relay is connected to the first terminal of the feedback resistor. That is, the relay is connected in series between the second terminal of the step-down module and the battery load. The second, third, fourth, and fifth terminals of the OR gate are the first terminals of the alarm structure, and the third and fourth terminals of the relay constitute the second terminal of the alarm structure.

10. A multi-channel charging power supply, characterized in that, include: Power supply casing and circuit board; The power supply casing has a power cord at one end, with the live wire and neutral wire connected to the positive and negative terminals of the circuit board, respectively. The power supply casing on the left and right sides of the power cord includes multiple ventilation holes; The other side of the power supply casing is connected to two sets of power output lines, including: a first power output line and a second power output line, which are connected to the battery load; both ends of the power supply casing have multiple ventilation holes at the plug-in points, and the bottom of the fan-shaped area at both ends of the power supply casing has a mounting groove; the left or right side of the power supply casing has an indicator light; one end of the power supply casing, which is connected to both ends of the power supply casing and the end with the indicator light, has a buzzer alarm window. The circuit board includes a heat dissipation module, the lower end of which is connected to a heat-conducting sheet. A capacitor is disposed on the upper end of the heat-conducting sheet, and an integrated module is disposed on one end of the capacitor. The integrated module integrates a multi-channel charging circuit as described in any one of claims 1 to 9.

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