Constant-voltage and constant-current conversion charging control circuit and device

Abstract

The utility model discloses a constant voltage and constant current conversion charging control circuit and device. The circuit comprises an input voltage module, a DCDC constant voltage conversion module, a charging current detection module, a closed loop feedback module, a battery interface module, an output current monitoring module and a voltage jump output module. The input voltage module is electrically connected with the DCDC constant voltage conversion module, the DCDC constant voltage conversion module is electrically connected with the charging current detection module, the charging current detection module is electrically connected with the closed-loop feedback module, the closed-loop feedback module, the battery interface module and the output current monitoring module, and the current monitoring module is electrically connected with the voltage jump module. And the voltage jump module is electrically connected with the main controller. Constant-voltage and constant-current output conversion can be achieved through the common DCDC constant-voltage conversion module, the output current is adjusted in real time according to the voltage of the battery, and the battery is charged in a constant-current mode. In addition, when the battery is fully charged, constant-voltage floating charge can be carried out, the service life of the battery is prolonged, the cost is low, and the development efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire alarm, in particular to a constant voltage constant current conversion charging control circuit and a device. Background Art

[0002] In the field of fire protection technology, the fire alarm host is powered by two power sources during use. One is the main power supply, which is 220V AC power supply, and the other is the backup power supply, which is usually a lead-acid battery or a lithium battery. According to the standard requirements, the backup power supply alone needs to enable the system to operate normally for more than 8 hours.

[0003] In practical applications, the battery charging process needs to be divided into three stages: the first stage is trickle charging; the second stage is constant current charging; and the third stage is constant voltage floating charging. However, the existing battery charging technologies all require the use of a dedicated battery charging management chip, that is, a specific battery needs to be matched with a specific battery charging management chip, and the applicability to the scene is not comprehensive and extensive enough.

[0004] The chip for charging the battery in the prior art is specially designed for the battery by the manufacturer, so the cost is generally high. The charging parameters of this battery charging chip have been determined at the beginning of the design, and it can only charge batteries of a certain type of parameters and types. The usage scenarios cannot cover most battery parameters and types. In addition, after determining the battery according to the product, it is also necessary to select the corresponding charging chip parameters according to the battery parameters. If the charging parameters do not match, the battery needs to be reselected and evaluated. This way of charging the battery charging management chip makes product development inefficient and costly. Therefore, inventing a reliable and efficient constant voltage and constant current conversion charging control circuit and device is an urgent problem to be solved by technicians in this field. Utility Model Content

[0005] The purpose of this application is to provide a constant voltage constant current conversion charging control circuit and device. In this solution, constant voltage constant current output conversion can be achieved through an ordinary DCDC constant voltage conversion module, and the output current is adjusted in real time according to the battery voltage to charge the battery in a constant current manner. In addition, when the battery is fully charged, constant voltage floating charge can be performed to extend the battery life, with low cost and improved development efficiency.

[0006] In order to solve the above technical problems, the present application provides a constant voltage constant current conversion charging control circuit, including an input voltage module, a DCDC constant voltage conversion module, a charging current detection module, a closed-loop feedback module, a battery interface module, an output current monitoring module and a voltage jump output module;

[0007] The input voltage module is electrically connected to the DCDC constant voltage conversion module, the DCDC constant voltage conversion module is electrically connected to the charging current detection module, the charging current detection module is electrically connected to the closed-loop feedback module, the closed-loop feedback module is electrically connected to the battery interface module and the output current monitoring module respectively, the current monitoring module is electrically connected to the voltage jump module, and the voltage jump output module is electrically connected to the main controller.

[0008] Preferably, the DCDC constant voltage conversion module includes a DCDC constant voltage converter and a first inductor;

[0009] The DCDC constant voltage converter is electrically connected to the input voltage module, the first end of the first inductor is electrically connected to a switch pin of the DCDC constant voltage converter, and the second end of the first inductor is electrically connected to the charging current detection module.

[0010] Preferably, the charging current detection module includes a first resistor;

[0011] The first end of the first resistor is electrically connected to the DCDC constant voltage conversion module, and the second end of the first resistor is electrically connected to the closed-loop feedback module.

[0012] Preferably, the closed-loop feedback module includes a first diode, a second resistor and a third resistor;

[0013] The first end of the second resistor is electrically connected to the anode of the first diode and the charging current detection module respectively, the second end of the second resistor is electrically connected to the first end of the third resistor and the output current monitoring module respectively, the cathode of the first diode is electrically connected to the battery interface module, and the second end of the third resistor is grounded.

[0014] Preferably, the output current monitoring module includes a first operational amplifier, a second diode, a fourth resistor and a fifth resistor;

[0015] The cathode of the second diode is electrically connected to the closed-loop feedback module, the anode of the second diode is electrically connected to the first end of the fourth resistor and the output end of the first operational amplifier, the second end of the fourth resistor is electrically connected to the inverting input end of the first operational amplifier and the first end of the fifth resistor, the second end of the fifth resistor is electrically connected to the voltage jump output module, and the non-inverting input end of the first operational amplifier is electrically connected to the charging current detection module.

[0016] Preferably, the output current monitoring module further includes a sixth resistor and a seventh resistor;

[0017] The first end of the sixth resistor is electrically connected to the first end of the seventh resistor and the non-inverting input end of the first operational amplifier, the second end of the sixth resistor is electrically connected to the charging current detection module, and the second end of the seventh resistor is grounded.

[0018] Preferably, the output current monitoring module further includes a first voltage regulator tube, a first capacitor and an eighth resistor;

[0019] The first end of the eighth resistor is electrically connected to the input power supply, the second end of the eighth resistor is electrically connected to the cathode of the first voltage regulator tube, the first end of the first capacitor and the power supply terminal of the first operational amplifier, the second end of the first capacitor is grounded, and the anode of the first voltage regulator tube is grounded.

[0020] Preferably, the voltage jump output module includes a second operational amplifier;

[0021] The non-inverting input terminal of the second operational amplifier is electrically connected to the output current monitoring module, the inverting input terminal of the second operational amplifier is electrically connected to the input power supply, and the output terminal of the second operational amplifier is electrically connected to the main controller.

[0022] Preferably, the voltage jump output module further includes a second voltage regulator tube and a third diode;

[0023] The output end of the second operational amplifier is electrically connected to the cathode of the second voltage regulator tube and the anode of the third diode respectively. The anode of the second voltage regulator tube is grounded, and the cathode of the third diode is electrically connected to the main controller.

[0024] In order to solve the above technical problems, the present application provides a constant current conversion charging control device, including the above-mentioned constant voltage constant current conversion charging control circuit.

[0025] A constant voltage constant current conversion charging control circuit of the utility model has the following beneficial effects. A constant voltage constant current conversion charging control circuit disclosed in the utility model includes: an input voltage module, a DCDC constant voltage conversion module, a charging current detection module, a closed-loop feedback module, a battery interface module, an output current monitoring module and a voltage jump output module; the input voltage module is electrically connected to the DCDC constant voltage conversion module, the DCDC constant voltage conversion module is electrically connected to the charging current detection module, the charging current detection module is electrically connected to the closed-loop feedback module, the closed-loop feedback module is electrically connected to the battery interface module and the output current monitoring module respectively, the current monitoring module is electrically connected to the voltage jump module, and the voltage jump module is electrically connected to the main controller. Therefore, the present application can realize constant voltage constant current output conversion through an ordinary DCDC constant voltage conversion module, the output current is adjusted in real time according to the battery voltage, and the battery is charged in a constant current manner. In addition, when the battery is fully charged, the battery can be float charged at a constant voltage, which prolongs the battery life, is low in cost, and improves development efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0027] Figure 1 This is a schematic diagram of the principle of a constant voltage and constant current conversion charging control circuit of a preferred embodiment of the utility model;

[0028] Figure 2 This is a circuit schematic diagram of a preferred embodiment of the utility model, which shows the connection of an input voltage module, a DCDC constant voltage conversion module, a charging current detection module, a closed-loop feedback module, and a battery interface module;

[0029] Figure 3 This is a circuit schematic diagram of an output current monitoring module of a preferred embodiment of the utility model;

[0030] Figure 4 The utility model is a circuit diagram of a voltage jump output module of a preferred embodiment. DETAILED DESCRIPTION

[0031] The core of this application is to provide a constant voltage constant current conversion charging control circuit and device. In this solution, constant voltage constant current output conversion can be achieved through an ordinary DCDC constant voltage conversion module, and the output current is adjusted in real time according to the battery voltage to charge the battery in a constant current manner. In addition, when the battery is fully charged, constant voltage floating charge can be performed to extend the battery life, with low cost and improved development efficiency.

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] See also Figure 1 , Figure 1 A structural schematic diagram of a constant voltage and constant current conversion charging control circuit provided in the present application includes an input voltage module 1, a DCDC constant voltage conversion module 2, a charging current detection module 3, a closed-loop feedback module 4, a battery interface module 5, an output current monitoring module 6 and a voltage jump output module 7;

[0034] The input voltage module 1 is electrically connected to the DCDC constant voltage conversion module 2, the DCDC constant voltage conversion module 2 is electrically connected to the charging current detection module 3, the charging current detection module 3 is electrically connected to the closed-loop feedback module 4, the closed-loop feedback module 4 is electrically connected to the battery interface module 5 and the output current monitoring module 6 respectively, the current monitoring module is electrically connected to the voltage jump module, and the voltage jump output module 7 is electrically connected to the main controller.

[0035] In the prior art, the chip for charging the battery is specially designed by the manufacturer for the battery, so the cost is generally high. The charging parameters of this battery charging chip have been determined at the beginning of the design, and it can only charge batteries of a certain type of parameters and types. The usage scenarios cannot cover most battery parameters and types. In addition, after determining the battery according to the product, it is also necessary to select the corresponding charging chip parameters according to the battery parameters. If the charging parameters do not match, the battery needs to be reselected and evaluated. This way of charging the battery charging management chip makes product development inefficient and costly.

[0036] In response to the above shortcomings, the present application realizes constant voltage floating charging through the cooperation of input voltage module 1, DCDC constant voltage conversion module 2, charging current detection module 3, closed-loop feedback module 4, battery interface module 5, output current monitoring module 6 and voltage jump output module 7, thereby extending the battery life and reducing cost.

[0037] Specifically, in this embodiment, the input voltage module 1 is used to connect the adapter and receive the charging input voltage; the DCDC constant voltage conversion module 2 is used to convert the charging input voltage into a constant current output through constant voltage conversion; the charging current detection module 3 is used to detect the battery charging current, and the charging current forms a charging voltage on both sides of the charging current detection module 3, and the charging voltage and the charging current are positively correlated; the output current monitoring module 6 is used to detect and amplify the charging voltage, and feed back the charging voltage to the DCDC constant voltage conversion module 2 through the closed-loop feedback module 4, thereby realizing constant current charging output.

[0038] Specifically, in the present embodiment, when the constant current charges the battery to the voltage set by the voltage loop, the voltage obtained through the closed-loop feedback module 4 no longer changes. Since the voltage fed back to the DCDC constant voltage conversion module 2 through the current loop of the output current monitoring module 6 becomes smaller, when the DCDC constant voltage conversion module 2 increases the output, it increases through the closed-loop feedback module 4 and is fed back to the DCDC constant voltage conversion module 2, thereby reducing the output voltage again, so that the output reaches a constant voltage state, that is, constant voltage floating charging is performed on the battery.

[0039] Specifically, in this embodiment, the voltage jump output module 7 is used to output a voltage jump after detecting that the battery reaches the floating charge voltage point, so that the main controller detects whether the battery is fully charged by detecting the voltage jump.

[0040] It can be understood that the DCDC constant voltage conversion module 2 of the present application is an ordinary DCDC constant voltage conversion chip. If the conversion is not performed through the constant current output circuit of the present application, the battery is directly connected to the DCDC constant voltage conversion module 2. Since the battery feed voltage is relatively low and the output voltage of the DCDC constant voltage conversion module 2 is high, the high voltage and the low voltage are connected together, generating a large current so that the DCDC constant voltage conversion module 2 triggers the short circuit protection or burns the circuit.

[0041] Specifically, in this embodiment, the main controller can be set to one or more of an MCU controller, an FPGA controller or a PLC controller, which is not specifically limited here.

[0042] Specifically, the present invention uses a common constant voltage DCDC conversion chip to achieve constant voltage to constant current output. The output current is adjusted in real time according to the battery charging voltage to charge the battery in a constant current manner. In addition, the present application can preset the voltage of the battery when it is fully charged. When the circuit fully charges the battery, the circuit will perform constant voltage floating charge on the battery at the fully charged voltage of the battery, thereby reducing the loss of the rechargeable battery, extending the service life of the rechargeable battery, and having high development efficiency.

[0043] In summary, the present application provides a constant voltage constant current conversion charging control circuit, in this scheme, including an input voltage module 1, a DCDC constant voltage conversion module 2, a charging current detection module 3, a closed-loop feedback module 4, a battery interface module 5, an output current monitoring module 6 and a voltage jump output module 7; the input voltage module 1 is electrically connected to the DCDC constant voltage conversion module 2, the DCDC constant voltage conversion module 2 is electrically connected to the charging current detection module 3, the charging current detection module 3 is electrically connected to the closed-loop feedback module 4, the closed-loop feedback module 4 is electrically connected to the battery interface module 5 and the output current monitoring module 6 respectively, the current monitoring module is electrically connected to the voltage jump module, and the voltage jump module is electrically connected to the main controller. Therefore, the present application can realize constant voltage constant current output conversion through an ordinary DCDC constant voltage conversion module 2, and the output current is adjusted in real time according to the battery voltage, and the battery is charged in a constant current manner. In addition, when the battery is fully charged, constant voltage floating charge can be performed, which prolongs the battery life, is low in cost, and improves development efficiency.

[0044] Based on the above embodiments:

[0045] Please refer to Figure 2 , Figure 2 A circuit schematic diagram of the connection of an input voltage module 1, a DCDC constant voltage conversion module 2, a charging current detection module 3, a closed-loop feedback module 4, and a battery interface module 5 provided in the present application.

[0046] As a preferred embodiment, the DCDC constant voltage conversion module 2 includes a DCDC constant voltage converter U1 and a first inductor L1;

[0047] The DCDC constant voltage converter U1 is electrically connected to the input voltage module 1 , a first end of the first inductor L1 is electrically connected to a switch pin of the DCDC constant voltage converter U1 , and a second end of the first inductor L1 is electrically connected to the charging current detection module 3 .

[0048] Specifically, the model of the DCDC constant voltage conversion module 2 of the present application can be implemented by existing technologies, and the chip model of the DCDC constant voltage conversion module 2 is not specifically limited.

[0049] As a preferred embodiment, the charging current detection module 3 includes a first resistor R1;

[0050] The first end of the first resistor R1 is electrically connected to the DCDC constant voltage conversion module 2 , and the second end of the first resistor R1 is electrically connected to the closed-loop feedback module 4 .

[0051] As a preferred embodiment, the closed-loop feedback module 4 includes a first diode D3, a second resistor R2 and a third resistor R5;

[0052] The first end of the second resistor R2 is electrically connected to the anode of the first diode D3 and the charging current detection module 3 respectively, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R5 and the output current monitoring module 6 respectively, the cathode of the first diode D3 is electrically connected to the battery interface module 5, and the second end of the third resistor R5 is grounded.

[0053] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of an output current monitoring module provided in this application.

[0054] As a preferred embodiment, the output current monitoring module 6 includes a first operational amplifier U2A, a second diode D1, a fourth resistor R6 and a fifth resistor R8;

[0055] The cathode of the second diode D1 is electrically connected to the closed-loop feedback module 4, the anode of the second diode D1 is electrically connected to the first end of the fourth resistor R6 and the output end of the first operational amplifier U2A, respectively, the second end of the fourth resistor R6 is electrically connected to the inverting input end of the first operational amplifier U2A and the first end of the fifth resistor R8, respectively, the second end of the fifth resistor R8 is electrically connected to the voltage jump output module 7, and the non-inverting input end of the first operational amplifier U2A is electrically connected to the charging current detection module 3.

[0056] As a preferred embodiment, the output current monitoring module 6 further includes a sixth resistor R9 and a seventh resistor R10;

[0057] The first end of the sixth resistor R9 is electrically connected to the first end of the seventh resistor R10 and the non-inverting input end of the first operational amplifier, the second end of the sixth resistor R9 is electrically connected to the charging current detection module 3, and the second end of the seventh resistor R10 is grounded.

[0058] As a preferred embodiment, the output current monitoring module 6 further includes a first voltage regulator tube ZD1, a first capacitor C6 and an eighth resistor R7;

[0059] The first end of the eighth resistor R7 is electrically connected to the input power supply, the second end of the eighth resistor R7 is electrically connected to the cathode of the first voltage regulator tube ZD1, the first end of the first capacitor C6 and the power supply end of the first operational amplifier U2A respectively, the second end of the first capacitor C6 is grounded, and the anode of the first voltage regulator tube ZD1 is grounded.

[0060] Specifically, the output current monitoring module 6 realizes real-time monitoring of the output current through the first operational amplifier U2A, controls the output voltage of the constant voltage output chip U1 in the DCDC constant voltage conversion module 2, and adjusts the output voltage of the constant voltage output chip U1 in real time to a fixed voltage value higher than the battery voltage, thereby achieving the purpose of constant current.

[0061] Specifically, the first resistor R1 is a charging current detection resistor. After the current flows through the first resistor R1, a voltage will be formed at both ends of the first resistor R1. The greater the current, the greater the voltage at both ends of the first resistor R1. The voltage at both ends of the first resistor R1 is detected and amplified by the first operational amplifier U2A and fed back to the constant voltage output chip U1. Among them, the amplification factor of the first operational amplifier U2A is 1+R6 / R8, and the voltage output from pin 1 of the first operational amplifier U2A is the voltage after the voltage at both ends of the first resistor R1 is amplified.

[0062] Specifically, assuming that the voltage across the first resistor R1 is V1 and the output voltage of pin 1 of the first operational amplifier U2A is V2, then V2 = (1 + R6 / R8) * V1; to avoid affecting the set maximum floating charge voltage, the output voltage V2 of the first operational amplifier U2A and the feedback reference voltage VFB of the constant voltage output chip U1 are isolated by the first diode D1; the maximum output voltage of the constant voltage output chip U1, that is, the floating charge voltage of the battery, is assumed to be VOUT, then VOUT = (1 + R2 / R5) * VFB.

[0063] Specifically, in this embodiment, the closed-loop feedback formed by the second resistor R2 and the third resistor R5 is a voltage loop, and the closed-loop feedback formed by the first operational amplifier U2A is a current loop; under the interaction of the voltage loop and the current loop, the ordinary constant voltage DCDC conversion chip can form a constant current output in the external load stage.

[0064] Specifically, assuming that at a certain moment, the battery voltage is too low and needs to be charged, the battery is connected to the interface J2 of the battery interface module 5, and the current flowing through the first resistor R1 will increase instantly, causing the voltage V1 across the first resistor R1 to increase. After amplification by the first operational amplifier U2A, the voltage of the output voltage V2 of pin 1 of the first operational amplifier U2A will also increase accordingly, and the VFB fed back to the constant voltage output chip U1 will also increase. The constant voltage output chip U1 will automatically adjust to lower the output voltage until the voltage of the output voltage V2 of pin 1 of the first operational amplifier U2A is equal to VFB plus the voltage drop of the first diode D1, forming a stable state, and at this time reaching a constant current state.

[0065] Specifically, the output current is constant and is assumed to be I, then (1+R6 / R8)*R1*I=VFB+VD, where VD is the voltage drop of the first diode D1. After sorting, I=(VFB+VD) / [(1+R6 / R8)*R1]. At the same time, the battery voltage will rise as it is charged. At the next moment, the voltage of the battery rises after charging, so the voltage difference across the first resistor R1 will become smaller, and the voltage after amplification by the second op amp U1 B will also become smaller, causing VFB to become smaller. When the feedback pin of the constant voltage output chip U1 detects that VFB has become smaller, it will automatically adjust the output voltage to increase, thereby returning to the constant current state.

[0066] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of a voltage jump output module provided in this application.

[0067] As a preferred embodiment, the voltage jump output module 7 includes a second operational amplifier U2B;

[0068] The in-phase input terminal of the second operational amplifier U2B is electrically connected to the output current monitoring module 6 , the inverting input terminal of the second operational amplifier U2B is electrically connected to the input power supply, and the output terminal of the second operational amplifier U2B is electrically connected to the main controller.

[0069] As a preferred embodiment, the voltage jump output module 7 further includes a second voltage regulator tube ZD2 and a third diode D2;

[0070] The output end of the second operational amplifier U2B is electrically connected to the cathode of the second voltage regulator tube ZD2 and the anode of the third diode D2 respectively. The anode of the second voltage regulator tube ZD2 is grounded, and the cathode of the third diode D2 is electrically connected to the main controller.

[0071] Specifically, in this embodiment, when the constant current charges the battery to the voltage set by the voltage loop, the voltage obtained by dividing the second resistor R2 and the third resistor R5 no longer changes, because the voltage fed back to the constant voltage output chip U1 through the current loop of the first operational amplifier U2A becomes smaller. When the constant voltage output chip U1 increases its output, the voltage divided by the second resistor R2 and the third resistor R5 will also increase, and will be fed back to the constant voltage output chip U1, thereby reducing the output voltage again; at this time, the output reaches a constant voltage state, that is, the battery is float charged at a constant voltage.

[0072] Specifically, in this embodiment, the function of the second operational amplifier U2B is to output a voltage jump after detecting that the battery reaches the floating charge voltage point, so that the main controller detects whether the battery is fully charged by detecting the voltage jump.

[0073] The present application also provides a constant current conversion charging control device, including a constant voltage constant current conversion charging control circuit.

[0074] For an introduction to a constant voltage and constant current conversion charging control circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.

[0075] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0076] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A constant voltage constant current conversion charging control circuit, characterized in that: It includes input voltage module, DCDC constant voltage conversion module, charging current detection module, closed-loop feedback module, battery interface module, output current monitoring module and voltage jump output module; The input voltage module is electrically connected to the DCDC constant voltage conversion module, the DCDC constant voltage conversion module is electrically connected to the charging current detection module, the charging current detection module is electrically connected to the closed-loop feedback module, the closed-loop feedback module is electrically connected to the battery interface module and the output current monitoring module respectively, the current monitoring module is electrically connected to the voltage jump module, and the voltage jump output module is electrically connected to the main controller.

2. A constant voltage constant current conversion charging control circuit according to claim 1, characterized in that: The DCDC constant voltage conversion module includes a DCDC constant voltage converter and a first inductor; The DCDC constant voltage converter is electrically connected to the input voltage module, the first end of the first inductor is electrically connected to a switch pin of the DCDC constant voltage converter, and the second end of the first inductor is electrically connected to the charging current detection module.

3. A constant voltage constant current conversion charging control circuit according to claim 1, characterized in that: The charging current detection module includes a first resistor; The first end of the first resistor is electrically connected to the DCDC constant voltage conversion module, and the second end of the first resistor is electrically connected to the closed-loop feedback module.

4. A constant voltage constant current conversion charging control circuit according to claim 1, characterized in that: The closed-loop feedback module includes a first diode, a second resistor and a third resistor; The first end of the second resistor is electrically connected to the anode of the first diode and the charging current detection module respectively, the second end of the second resistor is electrically connected to the first end of the third resistor and the output current monitoring module respectively, the cathode of the first diode is electrically connected to the battery interface module, and the second end of the third resistor is grounded.

5. The constant voltage constant current conversion charging control circuit according to claim 1, characterized in that: The output current monitoring module includes a first operational amplifier, a second diode, a fourth resistor and a fifth resistor; The cathode of the second diode is electrically connected to the closed-loop feedback module, the anode of the second diode is electrically connected to the first end of the fourth resistor and the output end of the first operational amplifier, the second end of the fourth resistor is electrically connected to the inverting input end of the first operational amplifier and the first end of the fifth resistor, the second end of the fifth resistor is electrically connected to the voltage jump output module, and the non-inverting input end of the first operational amplifier is electrically connected to the charging current detection module.

6. A constant voltage constant current conversion charging control circuit according to claim 5, characterized in that: The output current monitoring module also includes a sixth resistor and a seventh resistor; The first end of the sixth resistor is electrically connected to the first end of the seventh resistor and the non-inverting input end of the first operational amplifier, the second end of the sixth resistor is electrically connected to the charging current detection module, and the second end of the seventh resistor is grounded.

7. A constant voltage constant current conversion charging control circuit according to claim 6, characterized in that: The output current monitoring module also includes a first voltage regulator tube, a first capacitor and an eighth resistor; The first end of the eighth resistor is electrically connected to the input power supply, the second end of the eighth resistor is electrically connected to the cathode of the first voltage regulator tube, the first end of the first capacitor and the power supply terminal of the first operational amplifier, the second end of the first capacitor is grounded, and the anode of the first voltage regulator tube is grounded.

8. The constant voltage constant current conversion charging control circuit according to claim 1, characterized in that: The voltage jump output module includes a second operational amplifier; The non-inverting input terminal of the second operational amplifier is electrically connected to the output current monitoring module, the inverting input terminal of the second operational amplifier is electrically connected to the input power supply, and the output terminal of the second operational amplifier is electrically connected to the main controller.

9. A constant voltage constant current conversion charging control circuit according to claim 8, characterized in that: The voltage jump output module also includes a second voltage regulator tube and a third diode; The output end of the second operational amplifier is electrically connected to the cathode of the second voltage regulator tube and the anode of the third diode respectively. The anode of the second voltage regulator tube is grounded, and the cathode of the third diode is electrically connected to the main controller.

10. A constant current conversion charging control device, characterized in that: A constant voltage constant current conversion charging control circuit comprising any one of claims 1 to 9.

Images