High-power DC-DC charging circuit

Abstract

The utility model relates to the technical field of charging circuits, and discloses a high-power DC-DC charging circuit which comprises a mainboard circuit module and an auxiliary power supply module. According to the high-power DC-DC charging circuit, input flows through filtering of a capacitor C7 and a capacitor C8, then flows through an MOS tube Q1 and an MOS tube Q2 and flows into an auxiliary power supply module at the same time, so that the auxiliary power supply module works and supplies power to a control panel, the control panel works and outputs a driving signal, the MOS tube Q1 and the MOS tube Q2 are driven by a transformer T2 to be chopped into high-frequency alternating current, and the high-frequency alternating current is converted into high-frequency alternating current. And then, high-frequency transformation is performed through a transformer T1, electromagnetic transmission is performed, rectification is performed through a full-bridge diode group, filtering is performed through a capacitor C11, a capacitor C12, a capacitor C38, a capacitor C14, a capacitor C13 and an inductor L3, and desired voltage and current are output through conduction of a relay FJ1. High-power output is realized, and the circuit structure is simple and practical.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of charging circuits, and particularly relates to a high-power DC-DC charging circuit. BACKGROUND

[0002] If high-power output is needed for the existing charger, the circuit structure design of the entire charging circuit is relatively complex, which increases the volume of the charger, and various electronic components also appear in the circuit, which cannot be quickly checked when problems occur. CONTENT OF THE INVENTION

[0003] The application aims to provide a high-power DC-DC charging circuit to solve the technical problems in the background.

[0004] To achieve the above-mentioned purpose, the application discloses the following technical scheme: a high-power DC-DC charging circuit comprising a mainboard circuit module and an auxiliary power supply module.

[0005] The mainboard circuit module comprises a control board, a transformer T1, a transformer T2, a mutual inductor T3, a full-bridge diode group and a relay FJ1.

[0006] The 1st pin and the 2nd pin of the control board are connected with the input end of the transformer T2, the 3rd pin and the 4th pin of the control board are connected with the output end of the mutual inductor T3, the 5th pin, the 6th pin and the 13th pin of the control board are grounded, the 9th pin and the 19th pin of the control board are connected with the 4th pin and the 3rd pin of a plug-in connector YC respectively, the 1st pin of the plug-in connector YC is grounded, the 2nd pin of the plug-in connector YC is connected with the input VCC, and the 5th pin of the plug-in connector YC is connected with the positive output end OUT+; the 10th pin of the control board is connected with the 3rd pin and the 4th pin of a plug-in connector CN2 through a resistor R12, the 2nd pin of the plug-in connector CN2 is connected with the 14th pin of the control board, and the 1st pin of the plug-in connector CN2 is connected with a potentiometer VRC; the 11th pin of the control board is connected with the negative electrode of a capacitor C22, the positive electrode of the capacitor C22 is connected with the output end of the full-bridge diode group through a resistor R16; the 12th pin of the control board is connected with the input VCC, the 15th pin of the control board is connected with the 3rd pin of a lamp tube LED2 through a resistor R19, the 17th pin of the control board is connected with the 1st pin of the lamp tube LED2 through a resistor R20, and the 2nd pin of the lamp tube LED2 is grounded; the 16th pin of the control board is connected with the positive electrode of a photodiode LED3 through a resistor R17, and the negative electrode of the photodiode LED3 is grounded; the 18th pin, the 16th pin and the 15th pin of the control board are respectively connected with the 2nd pin, the 4th pin and the 3rd pin of a plug-in connector A-(G), the 1st pin of the plug-in connector A-(G) is connected with +12V voltage, the 5th pin of the plug-in connector A-(G) is grounded, and the 6th pin of the plug-in connector A-(G) is the output end thereof.

[0007] The transformer T2 is provided with a first secondary circuit and a second secondary circuit, the output end of the first secondary circuit is connected with the gate of a P-channel MOS tube Q1, the output end of the second secondary circuit is connected with the gate of a P-channel MOS tube Q2; the source of the P-channel MOS tube Q1 is connected with the drain of the P-channel MOS tube Q2, the source of the P-channel MOS tube Q2 is connected with the 3PIN of the first side of the mutual inductor T3, the source of the P-channel MOS tube Q2 is connected with the 1PIN of the input side of the transformer T1 through the capacitor C9 and the resistor R8 in sequence, the 2PIN of the input side of the transformer T1 is connected with the 4PIN of the first side of the mutual inductor T3; the drain of the P-channel MOS tube Q1 is connected with the first pin of the resistor R4, the positive pole of the capacitor C7 and the positive pole of the capacitor C26, the second pin of the resistor R4 is connected with the first pin of the resistor R7, the second pin of the resistor R7 is grounded, the negative pole of the capacitor C7 is connected with the positive pole of the capacitor C8, the negative pole of the capacitor C8 is connected with the second pin of the capacitor C31 and the first pin of the capacitor C31 is grounded, the second pin of the capacitor C31 is grounded, the second pin of the capacitor C7 is connected with the second pin of the capacitor C5 and the capacitor C6, the second pin of the capacitor C5 and the capacitor C6 is connected with the 1PIN of the input side of the transformer T1 respectively, the second pin of the capacitor C26 is grounded; the full-bridge diode group includes a first diode group and a second diode group, the 5PIN of the output side of the transformer T1 is connected with the positive pole of the first diode group, the 3PIN of the output side of the transformer T1 is connected with the positive pole of the second diode group; the 4PIN of the output side of the transformer T1 is connected with the first pin of the inductor L2, the second pin of the inductor L2 is connected with the 10PIN of the control panel through the resistor R12; the negative pole of the first diode group is connected with the positive pole of the capacitor C11, the positive pole of the capacitor C12, the positive pole of the inductor L3, the first pin of the capacitor C38 and the negative pole of the second diode group, the negative pole of the capacitor C11, the negative pole of the capacitor C12 and the second pin of the capacitor C38 are connected with the second end of the inductor L2, the second pin of the inductor L2 is connected with the first pin of the capacitor C33, the second pin of the capacitor C33 is grounded, the second pin of the inductor L2 is connected with the first pin of the constantan wire group, the second pin of the constantan wire group is connected with the negative pole of the capacitor C14, the first pin of the capacitor C13 and the 1PIN of the output plug-in board OUT1.The second pin of the inductor L3 is connected with the positive pole of the capacitor C14, the second pin of the capacitor C13, the first pin of the zero ohm resistor R0 and the first PIN of the normally open contact of the relay FJ1, the second pin of the zero ohm resistor R0 is connected with the positive pole of the diode D0, the negative pole of the diode D0 is connected with the 1 pin of the plug S0, the 2 pin of the plug S0 is connected with the second PIN of the normally open contact of the relay FJ1, the 2 pin of the plug S0 is connected with the first pin of the capacitor C32, the second pin of the capacitor C32 is connected with the negative output terminal OUT-, the 2 pin of the plug S0 is connected with the 2 pin of the output plug board OUT1, the 1 pin of the output plug board OUT1 is grounded; the first coil terminal of the relay FJ1 is connected with the negative pole of the diode D3, the positive pole of the diode D3 is connected with +12V voltage, the second coil terminal of the relay FJ1 is connected with the positive pole of the diode D5, the negative pole of the diode D5 is connected with the negative pole of the diode D3, the second coil terminal of the relay FJ1 is connected with the collector of the triode Q3, the collector of the triode Q3 is connected with the first pin of the resistor R15, the second pin of the resistor R15 is connected with the first pin of the resistor R14 and the resistor R13, the second PIN of the normally open contact of the relay FJ1 is connected with the positive pole of the diode D4, the negative pole of the diode D4 is connected with the second pin of the resistor R13, the second pin of the resistor R14 is grounded, the emitter of the triode Q3 is grounded;

[0008] The auxiliary power module comprises an optocoupler U1, an auxiliary chip U4 and a transformer T4;

[0009] The 1 pin of the optocoupler U1 on the photodiode side is connected with the 7 pin of the control board, the 2 pin of the optocoupler U1 on the photodiode side is connected with the 8 pin of the control board; the 3 pin of the optocoupler U1 on the triode side is connected with the 2 pin of the plug K1, the first pin of the resistor R10 and the 1 pin of the auxiliary chip U4, the 1 pin of the plug K1 is grounded, the second pin of the resistor R10 is connected with the positive pole of the capacitor C15 and the first pin of the capacitor C16, the negative pole of the capacitor C15 is grounded, the second pin of the capacitor C16 is connected with the 2 pin of the auxiliary chip U4 and grounded; the 3 pin of the auxiliary chip U4 is connected with the positive pole of the diode D1 and the 11 pin of the transformer T4; the negative pole of the diode D1 is connected with the negative pole of the TVS diode, the first pin of the capacitor C23 and the first pin of the resistor R11, the positive pole of the TVS diode C23, the second pin of the capacitor C23 and the second pin of the resistor R11 are all connected with a common terminal, and the common terminal is connected with +300V input voltage, the 12 pin of the transformer T4 is connected with the +300V input voltage, the common terminal is connected with the positive pole of the capacitor C24, and the negative pole of the capacitor C24 is grounded;

[0010] The 4-pin on the light coupling U1 on the triode side is connected with the negative pole of diode D2, the 2-pin of connector CN1 and the positive pole of capacitor C25; the 1-pin of connector CN1 is grounded, and the 1-pin of connector CN1 is connected with the negative pole of capacitor C25, the negative pole of capacitor C25 is connected with the 7-pin of transformer T4, the positive pole of diode D2 is connected with the 8-pin of transformer T4;

[0011] The 1-pin of transformer T4 is connected with the negative pole of capacitor C20, the 2-pin of voltage stabilizing chip U3, the negative pole of capacitor C21 and the 2-pin of 5V output interface, the 2-pin of transformer T4 is connected with the positive pole of diode D8, the negative pole of diode D8 is connected with the positive pole of capacitor C20 and the 1-pin of voltage stabilizing chip U3, the 3-pin of voltage stabilizing chip U3 is connected with the positive pole of capacitor C21 and the 1-pin of 5V output interface; the 3-pin of transformer T4 is connected with the positive pole of diode D7, the negative pole of diode D7 is connected with the positive pole of capacitor C19 and the 1-pin of wire row NTC, the negative pole of capacitor C19 is grounded, the 4-pin and 5-pin of transformer T4 are both connected with the 2-pin of wire row NTC, the 6-pin of transformer T4 is connected with the first pin of capacitor C29 and the positive pole of diode D6, the second pin of capacitor C29 is connected with the positive pole of capacitor C18 and input VCC, the negative pole of diode D6 is connected with the positive pole of capacitor C18 and input VCC, the negative pole of capacitor C18 is grounded.

[0012] Preferably, the constantan wire group comprises constantan wire RS1, constantan wire RS2, constantan wire RS3, constantan wire RS4, constantan wire RS5 and constantan wire RS6 arranged in parallel.

[0013] Preferably, the model of the control board is SG3525.

[0014] Preferably, the model of the auxiliary chip U4 is top225.

[0015] Preferably, the model of the voltage stabilizing chip U3 is 7805.

[0016] Beneficial effect: the high-power DC-DC charging circuit of the application, the input flows through the capacitor C7 and the capacitor C8, and then flows through the MOS tube Q1 and the MOS tube Q2, and flows into the auxiliary power supply module at the same time, so that the auxiliary power supply module works and supplies power to the control panel, so that the control panel works to output the driving signal to drive the MOS tube Q1 and the MOS tube Q2 to be chopped into high-frequency alternating current through the transformer T2, and then the high-frequency transformer T1 is used for electromagnetic transmission, and then the full-bridge diode group is used for rectification and filtering of the capacitor C11, the capacitor C12, the capacitor C38, the capacitor C14, the capacitor C13 and the inductor L3, and the relay FJ1 is turned on to output the desired voltage and current. The high-power output is realized, and the circuit structure is simple and practical. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The circuit principle diagram of the main board circuit module provided by the embodiment of the present application is shown in the figure.

[0019] Figure 2 The circuit principle diagram of the auxiliary power supply module provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] In this paper, the term "including" is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "including" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0022] A high-power DC-DC charging circuit, comprising a main board circuit module and an auxiliary power supply module;

[0023] As Figure 1As shown, the main board circuit module comprises a control board, transformer T1, transformer T2, mutual inductor T3, full-bridge diode group and relay FJ1.

[0024] The 1st pin and 2nd pin of the control board are connected with the input end of the transformer T2 respectively, the 3rd pin and 4th pin of the control board are connected with the output end of the mutual inductor T3 respectively, the 5th pin, 6th pin and 13th pin of the control board are grounded, the 9th pin and 19th pin of the control board are connected with the 4th pin and 3rd pin of the connector YC respectively, the 1st pin of the connector YC is grounded, the 2nd pin is connected with input VCC, and the 5th pin is connected with positive output end OUT+; the 10th pin of the control board is connected with the 3rd pin and 4th pin of the connector CN2 through resistor R12, the 2nd pin of the connector CN2 is connected with the 14th pin of the control board, and the 1st pin of the connector CN2 is connected with potentiometer VRC; the 11th pin of the control board is connected with the negative pole of capacitor C22, the positive pole of the capacitor C22 is connected with the output end of the full-bridge diode group through resistor R16; the 12th pin of the control board is connected with input VCC, the 15th pin of the control board is connected with the 3rd pin of the lamp tube LED2 through resistor R19, the 17th pin of the control board is connected with the 1st pin of the lamp tube LED2 through resistor R20, and the 2nd pin of the lamp tube LED2 is grounded; the 16th pin of the control board is connected with the positive pole of the photodiode LED3 through resistor R17, and the negative pole is grounded; the 18th pin, 16th pin and 15th pin of the control board are respectively connected with the 2nd pin, 4th pin and 3rd pin of the connector A-(G), the 1st pin of the connector A-(G) is connected with +12V voltage, the 5th pin of the connector A-(G) is grounded, and the 6th pin of the connector A-(G) is its output end.

[0025] The control board is SG3525, which has the function of outputting signal through feedback to control current and then control voltage.

[0026] The transformer T2 is provided with a first secondary circuit and a second secondary circuit, the output end of the first secondary circuit is connected with the gate of a P-channel MOS tube Q1, the output end of the second secondary circuit is connected with the gate of a P-channel MOS tube Q2; the source of the P-channel MOS tube Q1 is connected with the drain of the P-channel MOS tube Q2, the source of the P-channel MOS tube Q2 is connected with the 3PIN on the first side of the mutual inductor T3, the source of the P-channel MOS tube Q2 is connected with the 1PIN on the input side of the transformer T1 through the capacitor C9 and the resistor R8 in sequence, the 2PIN on the input side of the transformer T1 is connected with the 4PIN on the first side of the mutual inductor T3; the drain of the P-channel MOS tube Q1 is connected with the first pin of the resistor R4, the positive pole of the capacitor C7 and the positive pole of the capacitor C26, the second pin of the resistor R4 is connected with the first pin of the resistor R7, the second pin of the resistor R7 is grounded, the negative pole of the capacitor C7 is connected with the positive pole of the capacitor C8, the negative pole of the capacitor C8 is connected with the second pin of the capacitor C31 and the first pin of the capacitor C31 is grounded, the second pin of the capacitor C31 is grounded, the second pin of the capacitor C7 is connected with the second pin of the capacitor C5 and the capacitor C6, the second pin of the capacitor C5 and the capacitor C6 is connected with the 1PIN on the input side of the transformer T1 respectively, the second pin of the capacitor C26 is grounded; the full-bridge diode group includes a first diode group and a second diode group, the 5PIN on the output side of the transformer T1 is connected with the positive pole of the first diode group, the 3PIN on the output side of the transformer T1 is connected with the positive pole of the second diode group; the 4PIN on the output side of the transformer T1 is connected with the first pin of the inductor L2, the second pin of the inductor L2 is connected with the 10PIN of the control panel through the resistor R12; the negative pole of the first diode group is connected with the positive pole of the capacitor C11, the positive pole of the capacitor C12, the positive pole of the inductor L3, the first pin of the capacitor C38 and the negative pole of the second diode group, the negative pole of the capacitor C11, the negative pole of the capacitor C12 and the second pin of the capacitor C38 are connected with the second end of the inductor L2, the second pin of the inductor L2 is connected with the first pin of the capacitor C33, the second pin of the capacitor C33 is grounded, the second pin of the inductor L2 is connected with the first pin of the constantan wire group, the second pin of the constantan wire group is connected with the negative pole of the capacitor C14, the first pin of the capacitor C13 and the 1PIN of the output plug-in board OUT1.The second pin of the inductor L3 is connected with the positive pole of the capacitor C14, the second pin of the capacitor C13, the first pin of the zero ohm resistor R0 and the first PIN of the normally open contact of the relay FJ1, the second pin of the zero ohm resistor R0 is connected with the positive pole of the diode D0, the negative pole of the diode D0 is connected with the 1 pin of the plug S0, the 2 pin of the plug S0 is connected with the second PIN of the normally open contact of the relay FJ1, the 2 pin of the plug S0 is connected with the first pin of the capacitor C32, the second pin of the capacitor C32 is connected with the negative output terminal OUT-, the 2 pin of the output plug board OUT1 is connected with the 2 pin of the plug S0, and the 1 pin of the output plug board OUT1 is grounded. The first coil terminal of the relay FJ1 is connected with the negative pole of the diode D3, the positive pole of the diode D3 is connected with +12V voltage, the second coil terminal of the relay FJ1 is connected with the positive pole of the diode D5, the negative pole of the diode D5 is connected with the negative pole of the diode D3, the second coil terminal of the relay FJ1 is connected with the collector of the triode Q3, the collector of the triode Q3 is connected with the first pin of the resistor R15, the second pin of the resistor R15 is connected with the first pin of the resistor R14 and the resistor R13, the second PIN of the normally open contact of the relay FJ1 is connected with the positive pole of the diode D4, the negative pole of the diode D4 is connected with the second pin of the resistor R13, the second pin of the resistor R14 is grounded, and the emitter of the triode Q3 is grounded.

[0027] In the embodiment, the constantan wire group includes the constantan wires RS1, RS2, RS3, RS4, RS5 and RS6 arranged in parallel.

[0028] Through the main board circuit module, the input flows through the capacitors C7 and C8 for filtering, and then flows through the MOS tubes Q1 and Q2, and flows into the auxiliary power supply module at the same time, so that the auxiliary power supply module works and supplies power to the control board, so that the control board works to output the driving signal to drive the MOS tubes Q1 and Q2 for chopping to become high-frequency alternating current, and then the high-frequency voltage is transformed through the transformer T1, and then the full-bridge diode group is rectified and filtered by the capacitors C11, C12, C38, C14, C13 and L3, and the relay FJ1 is turned on to output the desired voltage and current.

[0029] As shown in Figure 2 The auxiliary power supply module includes the optocoupler U1, the auxiliary chip U4 and the transformer T4.

[0030] Pin 1 of the optocoupler U1 located on the photodiode side is connected to pin 7 of the control board, and pin 2 of the optocoupler U1 located on the photodiode side is connected to pin 8 of the control board; pin 3 of the optocoupler U1 located on the transistor side is connected to pin 2 of the connector K1, the first pin of the resistor R10, and pin 1 of the auxiliary chip U4, pin 1 of the connector K1 is grounded, the second pin of the resistor R10 is connected to the positive electrode of the capacitor C15 and the first pin of the capacitor C16, the negative electrode of the capacitor C15 is grounded, and the second pin of the capacitor C16 is connected to pin 2 of the auxiliary chip U4 and is also grounded; Pin 3 of the auxiliary chip U4 is connected to the positive electrode of the diode D1 and pin 11 of the transformer T4; the negative electrode of the diode D1 is connected to the negative electrode of the TVS diode, the first pin of the capacitor C23, and the first pin of the resistor R11. The positive electrode of the TVS diode C23, the second pin of the capacitor C23, and the second pin of the resistor R11 are all connected to a common terminal, and the common terminal is connected to the +300V input voltage. Pin 12 of the transformer T4 is connected to the +300V input voltage. The common terminal is connected to the positive electrode of the capacitor C24, and the negative electrode of the capacitor C24 is grounded.

[0031] Pin 4 on the transistor side of the optocoupler U1 is connected to the cathode of the diode D2, pin 2 of the connector CN1, and the positive electrode of the capacitor C25; pin 1 of the connector CN1 is grounded, and pin 1 of the connector CN1 is connected to the negative electrode of the capacitor C25, the negative electrode of the capacitor C25 is connected to pin 7 of the transformer T4, and the positive electrode of the diode D2 is connected to pin 8 of the transformer T4.

[0032] Pin 1 of the transformer T4 is connected to the negative electrode of the capacitor C20, pin 2 of the voltage regulator chip U3, the negative electrode of the capacitor C21, and pin 2 of the 5V output interface. Pin 2 of the transformer T4 is connected to the positive electrode of the diode D8, the negative electrode of the diode D8 is connected to the positive electrode of the capacitor C20 and pin 1 of the voltage regulator chip U3, and pin 3 of the voltage regulator chip U3 is connected to the positive electrode of the capacitor C21 and pin 1 of the 5V output interface. Pin 3 of the transformer T4 is connected to the positive electrode of the diode D7, and the negative electrode of the diode D8 is connected to the positive electrode of the capacitor C20 and pin 1 of the voltage regulator chip U3. The cathode of the tube D7 is connected to the anode of the capacitor C19 and pin 1 of the NTC bus. The cathode of the capacitor C19 is grounded. Pins 4 and 5 of the transformer T4 are both connected to pin 2 of the NTC bus. Pin 6 of the transformer T4 is connected to pin 1 of the capacitor C29 and the anode of the diode D6. The second pin of the capacitor C29 is connected to the anode of the capacitor C18 and the input VCC. The cathode of the diode D6 is connected to the anode of the capacitor C18 and the input VCC. The cathode of the capacitor C18 is grounded.

[0033] In this embodiment, the model of the auxiliary chip U4 is top225, and the model of the voltage regulator chip U3 is 7805.

[0034] By the above, the auxiliary power module is constituted by top225, the direct current voltage flows through the transformer 12-11 winding, the voltage and current of output are controlled by the closing and turning off of the MOS pipe (D-S) foot of the top225 chip.The feedback circuit is controlled by the control board, the output voltage is fed back to the control board, then through the voltage division of the control board, fed back to the photoelectric coupling U1, and then fed back to the auxiliary chip U4 to control the switch.The module is composed of a diode D1, a capacitor C23, a resistor R11 and a TVS diode, which can effectively suppress the peak and reduce the switching oscillation.The module has three output circuits in total, the 4-6 winding of the transformer T4, the 7-8 winding of the transformer T4 for outputting 12V voltage, the voltage of the two windings is controlled by the feedback circuit, and the 1-2 winding of the transformer T4 for outputting 5V voltage is controlled by the 7805 chip.

[0035] In the embodiment, the model of the part of the related electronic components can be referred to Table 1.

[0036] Table 1

[0037]

[0038]

[0039]

[0040] It should be noted that the connection relationship between the electronic components not specifically disclosed in the text and the characteristics of the electronic components specifically mentioned in the above (including but not limited to: model, parameter, etc.) can be referred to the specific showing in Figure 1 and Figure 2 , which will not be repeated here.

[0041] In summary, the high-power DC-DC charging circuit of the embodiment, the input flows through the filter of the capacitor C7 and the capacitor C8, then flows through the MOS pipe Q1 and the MOS pipe Q2, at the same time flows into the auxiliary power module, so that the auxiliary power module works and supplies power to the control board, so that the control board works to output the drive signal to drive the MOS pipe Q1 and the MOS pipe Q2 to chop and become high-frequency alternating current through the transformer T2, then through the transformer T1 high-frequency transformation and electromagnetic transmission, then through the rectification of the full-bridge diode group and the filter of the capacitor C11, the capacitor C12, the capacitor C38, the capacitor C14, the capacitor C13 and the inductor L3, and the conduction of the relay FJ1 to output the desired voltage and current. The high-power output is realized, and the circuit structure is simple and practical.

[0042] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent technical features, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high power DC-DC charging circuit, characterized by, The main board circuit module and the auxiliary power module are included. The main board circuit module includes a control board, a transformer T1, a transformer T2, a mutual inductor T3, a full-bridge diode group and a relay FJ1. The 1st pin and the 2nd pin of the control board are connected with the input end of the transformer T2 respectively, the 3rd pin and the 4th pin of the control board are connected with the output end of the mutual inductor T3 respectively, the 5th pin, the 6th pin and the 13th pin of the control board are grounded, the 9th pin and the 19th pin of the control board are connected with the 4th pin and the 3rd pin of the connector YC respectively, the 1st pin of the connector YC is grounded, the 2nd pin of the connector YC is connected with the input VCC, the 5th pin of the connector YC is connected with the positive output end OUT+, the 10th pin of the control board is connected with the 3rd pin and the 4th pin of the connector CN2 through the resistor R12, the 2nd pin of the connector CN2 is connected with the 14th pin of the control board, the 1st pin of the connector CN2 is connected with the potentiometer VRC, the 11th pin of the control board is connected with the negative pole of the capacitor C22, the positive pole of the capacitor C22 is connected with the output end of the full-bridge diode group through the resistor R16, the 12th pin of the control board is connected with the input VCC, the 15th pin of the control board is connected with the 3rd pin of the lamp tube LED2 through the resistor R19, the 17th pin of the control board is connected with the 1st pin of the lamp tube LED2 through the resistor R20, the 2nd pin of the lamp tube LED2 is grounded, the 16th pin of the control board is connected with the positive pole of the photodiode LED3 through the resistor R17, the negative pole of the photodiode LED3 is grounded, the 18th pin, the 16th pin and the 15th pin of the control board are connected with the 2nd pin, the 4th pin and the 3rd pin of the connector A-(G) respectively, the 1st pin of the connector A-(G) is connected with +12V voltage, the 5th pin of the connector A-(G) is grounded, the 6th pin of the connector A-(G) is the output end thereof; The transformer T2 is provided with a first secondary circuit and a second secondary circuit, the output end of the first secondary circuit is connected with the gate of a P-channel MOS tube Q1, the output end of the second secondary circuit is connected with the gate of a P-channel MOS tube Q2; the source of the P-channel MOS tube Q1 is connected with the drain of the P-channel MOS tube Q2, the source of the P-channel MOS tube Q2 is connected with the 3PIN of the first side of the mutual inductor T3, the source of the P-channel MOS tube Q2 is connected with the 1PIN of the input side of the transformer T1 through the capacitor C9 and the resistor R8 in sequence, the 2PIN of the input side of the transformer T1 is connected with the 4PIN of the first side of the mutual inductor T3; the drain of the P-channel MOS tube Q1 is connected with the first pin of the resistor R4, the positive pole of the capacitor C7 and the positive pole of the capacitor C26, the second pin of the resistor R4 is connected with the first pin of the resistor R7, the second pin of the resistor R7 is grounded, the negative pole of the capacitor C7 is connected with the positive pole of the capacitor C8, the negative pole of the capacitor C8 is connected with the second pin of the capacitor C31 and the first pin of the capacitor C31 is grounded, the second pin of the capacitor C31 is grounded, the second pin of the capacitor C7 is connected with the second pin of the capacitor C5 and the capacitor C6, the second pin of the capacitor C5 and the capacitor C6 is connected with the 1PIN of the input side of the transformer T1 respectively, the second pin of the capacitor C26 is grounded; the full-bridge diode group includes a first diode group and a second diode group, the 5PIN of the output side of the transformer T1 is connected with the positive pole of the first diode group, the 3PIN of the output side of the transformer T1 is connected with the positive pole of the second diode group; the 4PIN of the output side of the transformer T1 is connected with the first pin of the inductor L2, the second pin of the inductor L2 is connected with the 10PIN of the control panel through the resistor R12; the negative pole of the first diode group is connected with the positive pole of the capacitor C11, the positive pole of the capacitor C12, the positive pole of the inductor L3, the first pin of the capacitor C38 and the negative pole of the second diode group, the negative pole of the capacitor C11, the negative pole of the capacitor C12 and the second pin of the capacitor C38 are connected with the second end of the inductor L2, the second pin of the inductor L2 is connected with the first pin of the capacitor C33, the second pin of the capacitor C33 is grounded, the second pin of the inductor L2 is connected with the first pin of the constantan wire group, the second pin of the constantan wire group is connected with the negative pole of the capacitor C14, the first pin of the capacitor C13 and the 1PIN of the output plug-in board OUT1.The second foot of the inductor L3 is connected with the positive pole of the capacitor C14, the second foot of the capacitor C13, the first foot of the zero resistance R0 and the first PIN of the normally open contact of the relay FJ1, the second foot of the zero resistance R0 is connected with the positive pole of the diode D0, the negative pole of the diode D0 is connected with the 1 foot of the plug S0, the 2 foot of the plug S0 is connected with the second PIN of the normally open contact of the relay FJ1, the 2 foot of the plug S0 is connected with the first foot of the capacitor C32, the second foot of the capacitor C32 is connected with the negative output end OUT-, the 2 foot of the plug S0 is connected with the 2 foot of the output plug board OUT1, the 1 foot of the output plug board OUT1 is grounded; the first coil terminal of the relay FJ1 is connected with the negative pole of the diode D3, the positive pole of the diode D3 is connected with +12V voltage, the second coil terminal of the relay FJ1 is connected with the positive pole of the diode D5, the negative pole of the diode D5 is connected with the negative pole of the diode D3, the second coil terminal of the relay FJ1 is connected with the collector of the triode Q3, the collector of the triode Q3 is connected with the first foot of the resistance R15, the second foot of the resistance R15 is connected with the first foot of the resistance R14 and the resistance R13, the second PIN of the normally open contact of the relay FJ1 is connected with the positive pole of the diode D4, the negative pole of the diode D4 is connected with the second foot of the resistance R13, the second foot of the resistance R14 is grounded, and the emitter of the triode Q3 is grounded. The auxiliary power module includes an optical coupler U1, an auxiliary chip U4 and a transformer T4. The 1st pin of the optical coupler U1 on the photodiode side is connected with the 7th pin of the control board, the 2nd pin of the optical coupler U1 on the photodiode side is connected with the 8th pin of the control board, the 3rd pin of the optical coupler U1 on the triode side is connected with the 2nd pin of the connector K1, the first pin of the resistor R10 and the 1st pin of the auxiliary chip U4, the 1st pin of the connector K1 is grounded, the second pin of the resistor R10 is connected with the positive pole of the capacitor C15 and the first pin of the capacitor C16, the negative pole of the capacitor C15 is grounded, the second pin of the capacitor C16 is connected with the 2nd pin of the auxiliary chip U4 and grounded, the 3rd pin of the auxiliary chip U4 is connected with the positive pole of the diode D1 and the 11th pin of the transformer T4, the negative pole of the diode D1 is connected with the negative pole of the TVS diode, the first pin of the capacitor C23 and the first pin of the resistor R11, the positive pole of the TVS diode C23, the second pin of the capacitor C23 and the second pin of the resistor R11 are all connected with a common end point, and the common end point is connected with +300V input voltage, the 12th pin of the transformer T4 is connected with the +300V input voltage, the common end point is connected with the positive pole of the capacitor C24, and the negative pole of the capacitor C24 is grounded. The 4-pin on the triode side of the light coupling U1 is connected with the negative pole of diode D2, the 2-pin of connector CN1 and the positive pole of capacitor C25; the 1-pin of connector CN1 is grounded, and the 1-pin of connector CN1 is connected with the negative pole of capacitor C25, the negative pole of capacitor C25 is connected with the 7-pin of transformer T4, the positive pole of diode D2 is connected with the 8-pin of transformer T4; The 1-pin of transformer T4 is connected with the negative pole of capacitor C20, the 2-pin of voltage stabilizing chip U3, the negative pole of capacitor C21 and the 2-pin of 5V output interface, the 2-pin of transformer T4 is connected with the positive pole of diode D8, the negative pole of diode D8 is connected with the positive pole of capacitor C20 and the 1-pin of voltage stabilizing chip U3, the 3-pin of voltage stabilizing chip U3 is connected with the positive pole of capacitor C21 and the 1-pin of 5V output interface; the 3-pin of transformer T4 is connected with the positive pole of diode D7, the negative pole of diode D7 is connected with the positive pole of capacitor C19 and the 1-pin of wire row NTC, the negative pole of capacitor C19 is grounded, the 4-pin and 5-pin of transformer T4 are both connected with the 2-pin of wire row NTC, the 6-pin of transformer T4 is connected with the first pin of capacitor C29 and the positive pole of diode D6, the second pin of capacitor C29 is connected with the positive pole of capacitor C18 and input VCC, the negative pole of diode D6 is connected with the positive pole of capacitor C18 and input VCC, the negative pole of capacitor C18 is grounded.

2. The high power DC-DC charging circuit of claim 1, wherein, The constantan wire group comprises constantan wires RS1, RS2, RS3, RS4, RS5 and RS6 arranged in parallel.

3. The high power DC-DC charging circuit of claim 1, wherein, The model of the control board is SG3525.

4. The high power DC-DC charging circuit of claim 1, wherein, The model of the auxiliary chip U4 is top225.

5. The high power DC-DC charging circuit of claim 1, wherein, The model of the voltage stabilizing chip U3 is 7805.

Images