Intelligent safety charger

Abstract

The utility model provides an intelligent safety charger, which relates to the technical field of charging, and comprises an information acquisition circuit, the current input end of the information acquisition circuit is connected with the direct current cathode wiring end of a rectification circuit, and the switch end of the rectification circuit is connected with the switch control end of the information acquisition circuit; a signal receiving end of the signal feedback circuit is connected with a modulation signal output end of the information acquisition circuit, and a signal feedback end of the signal feedback circuit is connected with the pre-stage chip; and the signal transmitting end of the remote instruction receiving circuit is connected with the signal receiving end of the information acquisition circuit. The beneficial effects are that multiple control modes of the charging power are achieved so as to adapt to the charging power of different types of batteries, efficient and safe charging of multiple types of batteries can be realized in different environment conditions, and a convenient charging mode of remotely controlling starting and ending of charging of a charger can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, in particular to an intelligent and safe charger. Background Art

[0002] The working principle of current chargers is to charge the battery by simply adjusting the battery voltage and the current it can be charged into to ensure that the battery reaches the optimal charging state. The charging process generally includes: maintenance charge, fast charge, voltage-limited float charge, protection and charge indication circuits, which control the voltage and current to meet the battery's needs.

[0003] There are some shortcomings of chargers currently on the market:

[0004] ① Single function: only able to charge lead-acid batteries or lithium batteries, and unable to charge multiple types of batteries with one charger. With the popularity of electric vehicles, more and more small batteries in cars are using lithium batteries, or families with different types of cars need to meet the charging needs of different types of batteries.

[0005] ② The charging control method is too simple. The current product can only be simply controlled on the charger panel. It requires manual operation of the charger panel to control the charging on and off. It cannot be controlled remotely. There are defects in terms of safety and ease of use. Utility Model Content

[0006] In view of the problems existing in the prior art, the present invention provides an intelligent safety charger, comprising:

[0007] An information acquisition circuit, wherein a current input terminal of the information acquisition circuit is connected to a DC negative terminal of a rectifier circuit, and a switch terminal of the rectifier circuit is connected to a switch control terminal of the information acquisition circuit;

[0008] A signal feedback circuit, wherein a signal receiving end of the signal feedback is connected to the modulation signal output end of the information acquisition circuit, and a signal feedback end of the signal feedback circuit is connected to a previous chip;

[0009] A remote command receiving circuit, wherein a signal sending end of the remote command receiving circuit is connected to a signal receiving end of the information acquisition circuit.

[0010] Preferably, the information acquisition circuit includes:

[0011] A microcontrol unit, wherein a current collection terminal of the microcontrol unit is connected to a current collection terminal of a current collection circuit, a current input terminal of the current collection circuit is connected to a DC negative terminal of the rectifier circuit, a voltage collection terminal of the microcontrol unit is connected to a voltage collection terminal of the voltage collection circuit, and a temperature collection terminal of the microcontrol unit is connected to a temperature collection terminal of the temperature collection circuit;

[0012] The signal receiving end of the signal feedback is connected to the modulation signal output end of the micro control unit, and the signal sending end of the remote instruction receiving circuit is connected to the signal receiving end of the micro control unit.

[0013] Preferably, the current acquisition circuit includes:

[0014] a first resistor, one end of the first resistor being connected to the DC negative terminal of the rectifier circuit;

[0015] a first operational amplifier, wherein a positive input terminal of the first operational amplifier is connected to the other end of the first resistor and one end of the first capacitor, a negative input terminal of the first operational amplifier is connected to one end of a second resistor, and the other end of the second resistor and the other end of the first capacitor are grounded;

[0016] a second capacitor, one end of the second capacitor is connected to the output end of the first operational amplifier, one end of the third resistor, one end of the fourth resistor and one end of the fifth resistor, the other end of the second capacitor and the other end of the fourth resistor are grounded, the other end of the third resistor is connected to the inverting input end of the first operational amplifier, and the other end of the fifth resistor is connected to one end of the third capacitor and the current collection end of the micro control unit.

[0017] Preferably, the voltage acquisition circuit includes:

[0018] a sixth resistor, the sixth resistor being connected to the other end of the first resistor, the other end of the sixth resistor being connected to one end of the seventh resistor, the other end of the seventh resistor being connected to one end of the fourth capacitor, the cathode of the first diode, one end of the eighth resistor, and one end of the ninth resistor, the other end of the fourth capacitor, the anode of the first diode, and the other end of the eighth resistor being grounded;

[0019] The cathode of the first diode is connected to the voltage collection terminal of the micro control unit.

[0020] Preferably, the temperature acquisition circuit includes:

[0021] A tenth resistor, one end of which is connected to the temperature acquisition end of the micro control unit and one end of the cathode of the fifth capacitor, and one end of the eleventh resistor, and the other end of the tenth resistor and the other end of the fifth capacitor are grounded.

[0022] Preferably, the signal feedback circuit includes:

[0023] a twelfth resistor, one end of the twelfth resistor being connected to the modulation signal output end of the information acquisition circuit, the other end of the twelfth resistor being connected to one end of the sixth capacitor and one end of the thirteenth resistor, and the other end of the sixth capacitor being grounded;

[0024] a second operational amplifier, wherein a reverse connection terminal of the second operational amplifier is connected to the other end of the thirteenth resistor, one end of the seventh capacitor, and one end of the eighth capacitor, a positive input terminal of the second operational amplifier is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor, one end of the sixteenth resistor, and one end of the ninth capacitor, and the other end of the ninth capacitor and the other end of the fifteenth resistor are grounded;

[0025] A second diode, the anode of the second diode is connected to the output end of the second operational amplifier, the cathode of the second diode is connected to the other end of the seventh capacitor and one end of the seventeenth resistor, the other end of the seventeenth resistor is connected to the other end of the eighth capacitor, and the cathode of the second diode is also connected to the previous chip.

[0026] Preferably, the rectifier circuit includes:

[0027] a check switch, wherein a first terminal of the check switch is connected to one end of an eighteenth resistor, one end of a tenth capacitor, and the first terminal of the transformer; the other end of the eighteenth resistor is connected to one end of a nineteenth resistor and the other end of the tenth capacitor and is grounded; the other end of the nineteenth resistor is connected to the current input terminal of the information acquisition circuit; an eleventh capacitor is connected between the second terminal of the check switch and the other end of the nineteenth resistor; a switch end of the check switch is connected to one end of a twentieth resistor; and the other end of the twentieth resistor is connected to the switch control terminal of the information acquisition circuit;

[0028] a synchronous rectifier, wherein a fifth pin of the synchronous rectifier is connected to the first terminal of the check switch, the first pin, the second pin, the third pin, and the eighth pin of the synchronous rectifier are connected to the other end of the tenth capacitor, the seventh pin of the synchronous rectifier is connected to one end of the twelfth capacitor, the sixth pin of the synchronous rectifier is connected to one end of the twenty-first resistor, and the other end of the twelfth capacitor and the other end of the twenty-first resistor are connected to the other end of the tenth capacitor;

[0029] The fourth terminal of the transformer is connected to the fourth pin of the synchronous rectifier and one end of the twenty-second resistor, the other end of the twenty-second resistor is connected to one end of the thirteenth capacitor, and the other end of the thirteenth capacitor is connected to the other end of the tenth capacitor.

[0030] Preferably, the check switch includes:

[0031] a first MOS transistor, wherein the drain of the first MOS transistor is connected to one end of the eighteenth resistor, the source of the first MOS transistor is connected to one end of the twenty-third resistor and the source of the second MOS transistor, and the gate of the first MOS transistor, the other end of the twenty-third resistor, and the gate of the second MOS transistor are connected to one end of the twentieth resistor.

[0032] Preferably, the signal receiving end of the information acquisition circuit includes a first signal terminal and a second signal terminal, and the remote command receiving circuit includes:

[0033] A remote signal receiving chip, wherein a first pin of the remote signal receiving chip is connected to the first signal terminal, and a second pin of the remote signal receiving chip is connected to the second signal terminal.

[0034] The above technical solution has the following advantages or beneficial effects:

[0035] 1) An information acquisition circuit is set up to collect the current, voltage and temperature in the charger, and the existing analysis program is used for analysis to adjust the PWM signal duty cycle. After processing by the signal feedback circuit, the optocoupler feeds back to the front-stage chip in the charger to adjust the charging power, achieving multiple control methods for the charging power to adapt to the charging power of different types of batteries, so that multiple types of batteries can be charged efficiently and safely in different environmental conditions.

[0036] 2) The remote command receiving circuit receives the command information sent from the mobile phone or computer, and forwards the received command information to the information acquisition circuit. The information acquisition current controls the on and off of the rectifier circuit through the switch control end, which can realize a convenient charging method of remotely controlling the start and end of charging of the charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of a current acquisition circuit in a preferred embodiment of the present utility model;

[0038] Figure 2 This is a schematic structural diagram of a voltage acquisition circuit in a preferred embodiment of the present utility model;

[0039] Figure 3 This is a schematic diagram of the structure of the temperature acquisition circuit in a preferred embodiment of the present utility model;

[0040] Figure 4 This is a structural diagram of a signal feedback circuit in a preferred embodiment of the present utility model;

[0041] Figure 5This is a structural diagram of a rectifier circuit in a preferred embodiment of the present utility model;

[0042] Figure 6 This is a structural diagram of a remote command receiving circuit in a preferred embodiment of the present utility model;

[0043] Figure 7 This is a pin diagram of the micro control unit in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also fall within the scope of the present invention as long as they conform to the main purpose of the present invention.

[0045] In a preferred embodiment of the present invention, based on the above-mentioned problems existing in the prior art, a smart safety charger is provided, comprising:

[0046] An information acquisition circuit, wherein the current input terminal of the information acquisition circuit is connected to the DC negative terminal DC-1 of the rectifier circuit, and the switch terminal of the rectifier circuit is connected to the switch control terminal Q1-1 of the information acquisition circuit;

[0047] A signal feedback circuit, wherein the signal receiving end of the signal feedback circuit is connected to the modulation signal output end PWMV of the information acquisition circuit, and the signal feedback end of the signal feedback circuit is connected to the previous stage chip U1;

[0048] A remote command receiving circuit, wherein the signal sending end of the remote command receiving circuit is connected to the signal receiving end SDA\SCL of the information acquisition circuit.

[0049] The information acquisition circuit includes:

[0050] A microcontroller unit MCU, wherein a current collection terminal of the microcontroller unit is connected to a current collection terminal of a current collection circuit, a current input terminal of the current collection circuit is connected to a DC negative terminal of the rectifier circuit, a voltage collection terminal of the microcontroller unit is connected to a voltage collection terminal of the voltage collection circuit, and a temperature collection terminal of the microcontroller unit is connected to a temperature collection terminal of the temperature collection circuit;

[0051] The signal receiving end of the signal feedback is connected to the modulation signal output end of the micro control unit, and the signal sending end of the remote instruction receiving circuit is connected to the signal receiving end of the micro control unit.

[0052] Specifically, in this embodiment, Figure 7The figure shows the pin diagram of the microcontroller unit. The front stage of the rectifier circuit is connected to the front stage chip in the front stage circuit. The AC power is processed by the front stage chip and the rectifier circuit and then output to the subsequent battery for charging. The DC positive terminal DC+1 and the DC negative terminal DC-1 of the rectifier circuit are connected to the positive electrode BATT+ and the negative electrode BATT- of the battery. The information acquisition circuit includes a voltage acquisition circuit VS and a current acquisition circuit IS, which respectively collect the charging voltage and charging current, and transmit the collected current and voltage information back to the microcontroller unit MCU for processing using the program in the configured existing technology. By analyzing the voltage and current, the current state of the battery charging is obtained; and a temperature acquisition circuit is also provided, and multiple temperature monitoring channels are used to collect and compare the temperatures of the main components of the product respectively. The microcontroller unit MCU then analyzes the temperature information and current and voltage information of the environment in which the battery is located, and adjusts the duty cycle of the PWM signal in real time. The signal feedback circuit processes the signal and then feeds it back to the front-stage chip in the charger through the optocoupler. The front-stage chip U1 adjusts the charging power according to the received PWM signal. (The front-stage circuit and the front-stage chip U1 in this embodiment can be implemented using chips in the prior art, which can be connected between the transformer T1 and the mains, and can adjust the input power of the mains (high-voltage AC) according to the PWM signal fed back by the optocoupler of the signal feedback circuit.) Multiple control modes of the charging power can be achieved (that is, the charging power can be adjusted in many aspects according to current, voltage and temperature changes) to adapt to the charging power of different types of batteries, so that multiple types of batteries can be charged efficiently and safely in different environmental conditions.

[0053] A remote command receiving circuit is also provided, which receives command information sent from a mobile phone or computer, and communicates with the microcontroller unit MCU through SDA and SCL serial communication according to the received command. The microcontroller unit MCU then completes the execution of the charging process control and PWM signal adjustment. The remote command receiving circuit adopts Bluetooth and wireless technology, which can realize remote control of charging start and end, and realize convenient charging methods such as remote timed charging.

[0054] like Figure 1 As shown, the current acquisition circuit includes:

[0055] A first resistor R1, one end of the first resistor R1 is connected to the DC negative terminal DC- of the rectifier circuit;

[0056] a first operational amplifier OP1, wherein a positive input terminal of the first operational amplifier OP1 is connected to the other end of the first resistor R1 and one end of the first capacitor C1, a negative input terminal of the first operational amplifier OP1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 and the other end of the first capacitor C1 are grounded;

[0057] The second capacitor C2, one end of the second capacitor C2 is connected to the output end of the first operational amplifier OP1, one end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the second capacitor C2 and the other end of the fourth resistor R4 are grounded, the other end of the third resistor R3 is connected to the inverting input end of the first operational amplifier OP1, and the other end of the fifth resistor R5 is connected to one end of the third capacitor C3 and the current collection end IS of the micro control unit MCU.

[0058] Specifically, in this embodiment, a current acquisition circuit is provided in the information acquisition circuit, and the first resistor R1 is connected to the DC negative terminal DC-1 in the rectifier circuit, for real-time acquisition of the real-time current in the circuit and transmitting it to the microcontroller unit MCU for subsequent PWM signal modulation processing.

[0059] like Figure 2 As shown, the voltage acquisition circuit includes:

[0060] a sixth resistor R6, the sixth resistor R6 being connected to the other end of the first resistor R1, the other end of the sixth resistor R6 being connected to one end of a seventh resistor R7, the other end of the seventh resistor R7 being connected to one end of a fourth capacitor C4, the cathode of the first diode D1, one end of an eighth resistor R8, and one end of a ninth resistor R8, the other end of the fourth capacitor C4, the anode of the first diode D1, and the other end of the eighth resistor R8 being grounded;

[0061] The cathode of the first diode D1 is connected to the voltage collection terminal VS of the micro control unit.

[0062] Specifically, in this embodiment, a voltage acquisition circuit is provided within the information acquisition circuit. This circuit is connected to the first resistor D1 in the current acquisition circuit via a sixth resistor R6 and a seventh resistor R7. This circuit is used to acquire the real-time voltage within the circuit and transmit it to the microcontroller unit MCU for subsequent PWM signal modulation processing. Furthermore, a ninth resistor R9 is also connected to the positive terminal BATT+ of the battery.

[0063] like Figure 3 As shown, the temperature acquisition circuit includes:

[0064] The tenth resistor R10 has one end connected to the temperature acquisition terminal TS of the microcontroller unit MCU and one end of the cathode of the fifth capacitor C5 and one end of the eleventh resistor R11, and the other end of the tenth resistor R10 and the other end of the fifth capacitor C5 are grounded.

[0065] Specifically, in this embodiment, a temperature acquisition circuit is provided in the information acquisition circuit, and multiple circuits can be provided for acquiring the temperatures of multiple components in the charger and transmitting them to the microcontroller unit MCU for subsequent PWM signal modulation processing.

[0066] like Figure 4 As shown, the signal feedback circuit includes:

[0067] a twelfth resistor R12, one end of the twelfth resistor R12 is connected to the modulation signal output terminal PWMV of the information acquisition circuit, the other end of the twelfth resistor R12 is connected to one end of the sixth capacitor C6 and one end of the thirteenth resistor R13, and the other end of the sixth capacitor C6 is grounded;

[0068] a second operational amplifier OP2, wherein a reverse connection terminal of the second operational amplifier OP2 is connected to the other end of the thirteenth resistor R13, one end of the seventh capacitor C7, and one end of the eighth capacitor C8; a non-inverting input terminal of the second operational amplifier OP2 is connected to one end of the fourteenth resistor R14; the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15, one end of the sixteenth resistor R16, and one end of the ninth capacitor C9; the other end of the ninth capacitor C9 and the other end of the fifteenth resistor R15 are grounded;

[0069] The second diode D2, the anode of the second diode D2 is connected to the output end of the second operational amplifier OP2, the cathode of the second diode D2 is connected to the other end of the seventh capacitor C7 and one end of the seventeenth resistor R17, the other end of the seventeenth resistor R17 is connected to the other end of the eighth capacitor C8, and the cathode of the second diode D2 is also connected to the previous-stage chip U1.

[0070] Specifically, in this embodiment, after the signal feedback circuit receives the PWM signal sent by the microcontroller unit MCU, the PWM signal is amplified by the second operational amplifier of the signal feedback circuit and then fed back to the charger front-end chip via an optical coupler. The front-end chip then adjusts and controls the charging power based on the received PWM signal. Specifically, the front-end circuit and front-end chip in this embodiment can be implemented using chips in the prior art, which can be connected between the transformer and the mains power, and can adjust the input power of the mains power (high voltage AC) based on the PWM signal fed back by the optical coupler of the signal feedback circuit.

[0071] like Figure 5 As shown, the rectifier circuit includes:

[0072] A check switch SQ, wherein a first terminal of the check switch SQ is connected to one end of an eighteenth resistor R18, one end of a tenth capacitor C19, and the first terminal 11 of the transformer T1; the other end of the eighteenth resistor R18 is connected to one end of a nineteenth resistor R19 and the other end of a tenth capacitor C10 and to ground; the other end of the nineteenth resistor R19 is connected to a current input terminal of the information acquisition circuit; an eleventh capacitor C11 is connected between a second terminal of the check switch SQ and the other end of the nineteenth resistor R19; a switch end of the check switch SQ is connected to one end of a twentieth resistor R20, and the other end of the twentieth resistor R20 is connected to a switch control terminal Q1-1 of the information acquisition circuit;

[0073] a synchronous rectifier U7, a fifth pin of the synchronous rectifier U7 connected to the first terminal of the check switch SQ, a first pin, a second pin, a third pin, and an eighth pin of the synchronous rectifier U7 connected to the other end of the tenth capacitor C10, a seventh pin of the synchronous rectifier U7 connected to one end of the twelfth capacitor C12, a sixth pin of the synchronous rectifier U7 connected to one end of the twenty-first resistor R21, and the other end of the twelfth capacitor C12 and the other end of the twenty-first resistor R21 connected to the other end of the tenth capacitor C10;

[0074] The fourth terminal of the transformer T1 is connected to the fourth pin of the synchronous rectifier U7 and one end of the 22nd resistor R21. The other end of the 22nd resistor R22 is connected to one end of the 13th capacitor C13. The other end of the 13th capacitor C13 is connected to the other end of the tenth capacitor C10.

[0075] In this embodiment, the check switch SQ includes:

[0076] A first MOS transistor MOS1 has a drain connected to one end of the eighteenth resistor R18, a source connected to one end of the twenty-third resistor R23 and a source of the second MOS transistor MOS2, and a gate of the first MOS transistor MOS1, the other end of the twenty-third resistor R23, and a gate of the second MOS transistor MOS2 are connected to one end of the twentieth resistor R20.

[0077] Specifically, in this embodiment, the mains power (high-voltage alternating current) is rectified and converted into low-voltage direct current through the cooperation of the rectifier circuit and the front-stage circuit, and output to the battery for charging. A synchronous rectifier is provided in the rectifier circuit to rectify the mains power after adjustment by the front-stage circuit, and a check switch is also provided to prevent the current in the battery from flowing back and damaging the charger. The conduction state of the check switch is controlled by the switch control terminal of the microcontroller unit.

[0078] like Figure 6 As shown, the signal receiving end of the information acquisition circuit includes a first signal terminal and a second signal terminal, and the remote command receiving circuit includes:

[0079] A remote signal receiving chip S1 , wherein a first pin of the remote signal receiving chip S1 is connected to a first signal terminal SDA, and a second pin of the remote signal receiving chip S1 is connected to a second signal terminal SCL.

[0080] Specifically, in this embodiment, the remote signal receiving chip S1 utilizes Bluetooth and wireless technologies to receive remote commands from a mobile phone or computer, and transmits the received commands to the microcontroller unit (MCU) via its SDA and SCL serial interfaces. An LED indicator is also connected to pin 24 of the remote signal receiving chip to indicate the signal reception status of the remote signal receiving chip S1.

[0081] The above are only preferred embodiments of the present invention and do not limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. An intelligent safety charger, characterized in that: include: An information acquisition circuit, wherein a current input terminal of the information acquisition circuit is connected to a DC negative terminal of a rectifier circuit, and a switch terminal of the rectifier circuit is connected to a switch control terminal of the information acquisition circuit; A signal feedback circuit, wherein a signal receiving end of the signal feedback circuit is connected to the modulated signal output end of the information acquisition circuit, and a signal feedback end of the signal feedback circuit is connected to a previous-stage chip; A remote command receiving circuit, wherein a signal sending end of the remote command receiving circuit is connected to a signal receiving end of the information acquisition circuit.

2. The intelligent safety charger according to claim 1, characterized in that: The information acquisition circuit includes: A microcontrol unit, wherein a current collection terminal of the microcontrol unit is connected to a current collection terminal of a current collection circuit, a current input terminal of the current collection circuit is connected to a DC negative terminal of the rectifier circuit, a voltage collection terminal of the microcontrol unit is connected to a voltage collection terminal of the voltage collection circuit, and a temperature collection terminal of the microcontrol unit is connected to a temperature collection terminal of the temperature collection circuit; The signal receiving end of the signal feedback is connected to the modulation signal output end of the micro control unit, and the signal sending end of the remote instruction receiving circuit is connected to the signal receiving end of the micro control unit.

3. The intelligent safety charger according to claim 2, characterized in that: The current acquisition circuit includes: a first resistor, one end of the first resistor being connected to the DC negative terminal of the rectifier circuit; a first operational amplifier, wherein a positive input terminal of the first operational amplifier is connected to the other end of the first resistor and one end of the first capacitor, a negative input terminal of the first operational amplifier is connected to one end of a second resistor, and the other end of the second resistor and the other end of the first capacitor are grounded; a second capacitor, one end of the second capacitor is connected to the output end of the first operational amplifier, one end of the third resistor, one end of the fourth resistor and one end of the fifth resistor, the other end of the second capacitor and the other end of the fourth resistor are grounded, the other end of the third resistor is connected to the inverting input end of the first operational amplifier, and the other end of the fifth resistor is connected to one end of the third capacitor and the current collection end of the micro control unit.

4. The intelligent safety charger according to claim 3, characterized in that: The voltage acquisition circuit includes: a sixth resistor, the sixth resistor being connected to the other end of the first resistor, the other end of the sixth resistor being connected to one end of the seventh resistor, the other end of the seventh resistor being connected to one end of the fourth capacitor, the cathode of the first diode, one end of the eighth resistor, and one end of the ninth resistor, the other end of the fourth capacitor, the anode of the first diode, and the other end of the eighth resistor being grounded; The cathode of the first diode is connected to the voltage collection terminal of the micro control unit.

5. The intelligent safety charger according to claim 2, characterized in that: The temperature acquisition circuit includes: A tenth resistor, one end of which is connected to the temperature acquisition end of the micro control unit and one end of the cathode of the fifth capacitor, and one end of the eleventh resistor, and the other end of the tenth resistor and the other end of the fifth capacitor are grounded.

6. The intelligent safety charger according to claim 1, characterized in that: The signal feedback circuit includes: a twelfth resistor, one end of the twelfth resistor being connected to the modulation signal output end of the information acquisition circuit, the other end of the twelfth resistor being connected to one end of the sixth capacitor and one end of the thirteenth resistor, and the other end of the sixth capacitor being grounded; a second operational amplifier, wherein a reverse connection terminal of the second operational amplifier is connected to the other end of the thirteenth resistor, one end of the seventh capacitor, and one end of the eighth capacitor, a positive input terminal of the second operational amplifier is connected to one end of the fourteenth resistor, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor, one end of the sixteenth resistor, and one end of the ninth capacitor, and the other end of the ninth capacitor and the other end of the fifteenth resistor are grounded; A second diode, the anode of the second diode is connected to the output end of the second operational amplifier, the cathode of the second diode is connected to the other end of the seventh capacitor and one end of the seventeenth resistor, the other end of the seventeenth resistor is connected to the other end of the eighth capacitor, and the cathode of the second diode is also connected to the previous chip.

7. The intelligent safety charger according to claim 1, characterized in that: The rectifier circuit comprises: a check switch, wherein a first terminal of the check switch is connected to one end of an eighteenth resistor, one end of a tenth capacitor, and the first terminal of the transformer; the other end of the eighteenth resistor is connected to one end of a nineteenth resistor and the other end of the tenth capacitor and is grounded; the other end of the nineteenth resistor is connected to the current input terminal of the information acquisition circuit; an eleventh capacitor is connected between the second terminal of the check switch and the other end of the nineteenth resistor; a switch end of the check switch is connected to one end of a twentieth resistor; and the other end of the twentieth resistor is connected to the switch control terminal of the information acquisition circuit; a synchronous rectifier, wherein a fifth pin of the synchronous rectifier is connected to the first terminal of the check switch, the first pin, the second pin, the third pin, and the eighth pin of the synchronous rectifier are connected to the other end of the tenth capacitor, the seventh pin of the synchronous rectifier is connected to one end of the twelfth capacitor, the sixth pin of the synchronous rectifier is connected to one end of the twenty-first resistor, and the other end of the twelfth capacitor and the other end of the twenty-first resistor are connected to the other end of the tenth capacitor; The fourth terminal of the transformer is connected to the fourth pin of the synchronous rectifier and one end of the twenty-second resistor, the other end of the twenty-second resistor is connected to one end of the thirteenth capacitor, and the other end of the thirteenth capacitor is connected to the other end of the tenth capacitor.

8. The intelligent safety charger according to claim 7, characterized in that: The check switch comprises: a first MOS transistor, wherein the drain of the first MOS transistor is connected to one end of the eighteenth resistor, the source of the first MOS transistor is connected to one end of the twenty-third resistor and the source of the second MOS transistor, and the gate of the first MOS transistor, the other end of the twenty-third resistor, and the gate of the second MOS transistor are connected to one end of the twentieth resistor.

9. The intelligent safety charger according to claim 1, characterized in that: The signal receiving end of the information acquisition circuit includes a first signal terminal and a second signal terminal, and the remote command receiving circuit includes: A remote signal receiving chip, wherein a first pin of the remote signal receiving chip is connected to the first signal terminal, and a second pin of the remote signal receiving chip is connected to the second signal terminal.

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