A voltage and current stabilizing circuit with a built-in absorption circuit

Abstract

The present invention discloses a voltage and current stabilizing circuit with a built-in absorption circuit, which includes a switching power supply module, a DCDC control module, an MCU control module, a constant voltage and constant current control circuit, a constant voltage and constant current absorption control circuit, a voltage adder circuit, an inverting output control circuit, and a voltage and current acquisition circuit. The output end of the switching power supply module is respectively connected to the input ends of the DCDC control module and the MCU control module. This voltage and current stabilizing circuit with a built-in absorption circuit combines the front-end switching power supply module and the DCDC control module, and the back-end constant voltage and constant current control circuit and the constant voltage and constant current absorption control circuit for output, so as to achieve multiple functional constant voltage and constant current modes, outputs enabling the charger, the load, and the charger and the load simultaneously, which can meet the requirements of different functional tests of the protection board, and has high module integration, simple debugging process, and reduced production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery protection boards, and specifically to a voltage and current stabilizing circuit with a built-in absorption circuit. Background Art

[0002] With the extensive use of lithium batteries and lithium iron phosphate batteries, considering the safety of equipment, the safety performance test of the accompanying protection board is extremely important; the safety performance test includes overvoltage charging and undervoltage discharging tests, which require the battery at the protection board end to meet the requirements for rapid rise and fall to enable the protection of the protection board. If testing the overvoltage charging and undervoltage discharging of a multi-section protection board, it is necessary to supply power through multiple strings of batteries for simulation. However, in actual rapid testing, the battery cannot meet the test requirements of the protection board. Therefore, manufacturers urgently need a power supply that meets the test requirements of the protection board.

[0003] Currently, for this test requirement, the traditional test method of manufacturers is to use an external power supply to simulate the battery to supply power to the protection board. If it is a multi-string protection board, multiple external power supplies are required, resulting in complex production processes and high costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a voltage and current stabilizing circuit with a built-in absorption circuit, which can achieve multiple groups of functional constant voltage and constant current modes, the output of enabling the charger, the load, and the charger and the load simultaneously, meet the requirements of different functional tests of the protection board, and has a high module integration degree, simple debugging process, and reduced production costs, and can solve the problems in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A voltage and current stabilizing circuit with a built-in absorption circuit includes a switching power supply module, a DCDC control module, an MCU control module, a constant voltage and constant current control circuit, a constant voltage and constant current absorption control circuit, a voltage adder circuit, an inverting output control circuit, and a voltage and current acquisition circuit. The output end of the switching power supply module is respectively connected to the input ends of the DCDC control module and the MCU control module. The output end of the DCDC control module is connected to the input end of the constant voltage and constant current control circuit. The output end of the MCU control module is respectively connected to the input ends of the DCDC control module, the constant voltage and constant current control circuit, the constant voltage and constant current absorption control circuit, the voltage adder circuit, and the inverting output control circuit. The output ends of the voltage adder circuit and the inverting output control circuit are connected to the input end of the constant voltage and constant current absorption control circuit. The output end of the voltage and current acquisition circuit is respectively connected to the input ends of the MCU control module, the constant voltage and constant current control circuit, and the constant voltage and constant current absorption control circuit.

[0006] Preferably, the constant voltage and constant current control circuit consists of operational amplifier U1A, operational amplifier U1B, and MOS transistor Q1. The pin 2 of operational amplifier U1A is connected to resistor R4 and receives the C-VSET signal output by the MCU control module. The pin 3 of operational amplifier U1A is connected to resistor R5 and receives the VFB signal output by the MCU control module. The pin 1 of operational amplifier U1A is connected to the parallel combination of resistor R1 and diode D1. Meanwhile, diode D1 is connected to resistor R3 and to the gate of MOS transistor Q1. The pin 6 of operational amplifier U1B is connected to resistor R6 and receives the C-ISET signal output by the MCU control module. The pin 5 of operational amplifier U1B is connected to resistor R7 and receives the IFB signal output by the MCU control module. The pin 7 of operational amplifier U1B is connected to the parallel combination of resistor R2 and diode D2. Meanwhile, diode D2 is connected to resistor R8 and to the gate of MOS transistor Q1.

[0007] Preferably, the constant voltage and constant current absorption control circuit consists of operational amplifier U2A, operational amplifier U2B, and optocoupler U6. The pin 2 of operational amplifier U2A is connected to resistor R9 and receives the D-VSET signal output by the MCU control module 3. The pin 3 of operational amplifier U2A is connected to resistor R10 and receives the VFB signal output by the MCU control module. The pin 1 of operational amplifier U2A is connected to the parallel combination of resistor R11 and diode D3. Meanwhile, diode D3 is connected to resistor R12 and to the pin 4 of optocoupler U6. The pin 6 of operational amplifier U2B is connected to resistor R13 and receives the D-ISET signal output by the MCU control module. The pin 5 of operational amplifier U2B is connected to resistor R14 and receives the IFB signal output by the MCU control module. The pin 7 of operational amplifier U2B is connected to the parallel combination of resistor R15 and diode D4. Meanwhile, diode D4 is connected to resistor R16 and to the pin 2 of optocoupler U6.

[0008] Preferably, the voltage adder circuit consists of operational amplifier U3. The pin 3 of operational amplifier U3 is respectively connected to resistor R22 and resistor R23 and receives the C-VSET signal and the IFB signal output by the MCU control module. The pin 1 of operational amplifier U3 outputs the D-VSET signal.

[0009] Preferably, the inverting output control circuit 7 consists of operational amplifier U4. The pin 4 of operational amplifier U4 is respectively connected to resistor R25 and receives the C-ISET signal output by the MCU control module. The pin 1 of operational amplifier U4 outputs the D-ISET signal.

[0010] Preferably, the voltage and current acquisition circuit consists of operational amplifier U5A and operational amplifier U5B. Pin 1 of operational amplifier U5A is connected to resistor R28 and is connected to the MCU control module. Pins 2 and 3 of operational amplifier U5A are respectively connected to resistor R31 and resistor R32 and receive the VS- signal and VS+ signal. Pin 7 of operational amplifier U5B is connected to resistor R27 and is connected to the MCU control module. Pins 5 and 6 of operational amplifier U5B are respectively connected to resistor R35 and resistor R34 and receive the IS- signal and IS+ signal.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] This voltage and current stabilizing circuit with a built-in absorption circuit uses a combination of a switching power supply module and a DCDC control module for front-end power control, which can effectively reduce the voltage drop power consumption of the subsequent MOS transistor. The MCU control circuit outputs the C-VSET signal and the C-ISET signal to control the subsequent output, making the debugging process simple and saving production costs. The constant voltage and constant current control circuit and the constant voltage and constant current absorption control circuit are combined to output, which can realize multiple functional constant voltage and constant current modes, and the outputs of the charger, the load, and the charger and the load enabled simultaneously can meet the requirements of different function tests of the protection board. Moreover, the constant voltage and constant current absorption control circuit can effectively and quickly adjust and pull down the voltage and current values output by the constant voltage and constant current control circuit, so as to meet the needs of the discharge under-voltage test of the protection board, and the module has a high integration degree, a simple debugging process, and can effectively reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the module principle block diagram of the present invention;

[0014] Figure 2 is the circuit schematic diagram of the present invention.

[0015] In the figure: 1. Switching power supply module; 2. DCDC control module; 3. MCU control module; 4. Constant voltage and constant current control circuit; 5. Constant voltage and constant current absorption control circuit; 6. Voltage adder circuit; 7. Inverting output control circuit; 8. Voltage and current acquisition circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the present invention.

[0017] Please refer to Figure 1-2, A voltage and current stabilizing circuit with a built-in absorption circuit, comprising a switching power supply module 1, a DCDC control module 2, an MCU control module 3, a constant voltage and constant current control circuit 4, a constant voltage and constant current absorption control circuit 5, a voltage adder circuit 6, an inverting output control circuit 7, and a voltage and current acquisition circuit 8. The output end of the switching power supply module 1 is respectively connected to the input ends of the DCDC control module 2 and the MCU control module 3. The output end of the DCDC control module 2 is connected to the input end of the constant voltage and constant current control circuit 4. The output end of the MCU control module 3 is respectively connected to the input ends of the DCDC control module 2, the constant voltage and constant current control circuit 4, the constant voltage and constant current absorption control circuit 5, the voltage adder circuit 6, and the inverting output control circuit 7. The output ends of the voltage adder circuit 6 and the inverting output control circuit 7 are connected to the input end of the constant voltage and constant current absorption control circuit 5. The output end of the voltage and current acquisition circuit 8 is respectively connected to the input ends of the MCU control module 3, the constant voltage and constant current control circuit 4, and the constant voltage and constant current absorption control circuit 5.

[0018] The constant voltage and constant current control circuit 4 is composed of an operational amplifier U1A, an operational amplifier U1B, and a MOS transistor Q1. The pin 2 of the operational amplifier U1A is connected to a resistor R4 and receives the C-VSET signal output by the MCU control module 3. The pin 3 of the operational amplifier U1A is connected to a resistor R5 and receives the VFB signal output by the MCU control module 3. The pin 1 of the operational amplifier U1A is connected to the parallel-connected resistors R1 and a diode D1. At the same time, the diode D1 is connected to a resistor R3 and is connected to the gate of the MOS transistor Q1. The pin 6 of the operational amplifier U1B is connected to a resistor R6 and receives the C-ISET signal output by the MCU control module 3. The pin 5 of the operational amplifier U1B is connected to a resistor R7 and receives the IFB signal output by the MCU control module 3. The pin 7 of the operational amplifier U1B is connected to the parallel-connected resistors R2 and a diode D2. At the same time, the diode D2 is connected to a resistor R8 and is connected to the gate of the MOS transistor Q1.

[0019] In the above, the operational amplifier U1A and the operational amplifier U1B receive the C-VSET signal and the C-ISET signal output by the MCU control module 3, and enable the circuit to work under the conducting MOS transistor Q1.

[0020] The constant voltage and constant current absorption control circuit 5 consists of an operational amplifier U2A, an operational amplifier U2B, and an optocoupler U6. The 2nd pin of the operational amplifier U2A is connected to a resistor R9 and receives the D-VSET signal output by the MCU control module 3. The 3rd pin of the operational amplifier U2A is connected to a resistor R10 and receives the VFB signal output by the MCU control module 3. The 1st pin of the operational amplifier U2A is connected to the parallel-connected resistors R11 and a diode D3. At the same time, the diode D3 is connected to a resistor R12 and connected to the 4th pin of the optocoupler U6. The 6th pin of the operational amplifier U2B is connected to a resistor R13 and receives the D-ISET signal output by the MCU control module 3. The 5th pin of the operational amplifier U2B is connected to a resistor R14 and receives the IFB signal output by the MCU control module 3. The 7th pin of the operational amplifier U2B is connected to the parallel-connected resistors R15 and a diode D4. At the same time, the diode D4 is connected to a resistor R16 and connected to the 2nd pin of the optocoupler U6.

[0021] In the above, the signals of D-VSET and D-ISET after the conversion of C-VSET and C-ISET output from the MCU control module 3 by the operational amplifier U2A and the operational amplifier U2B enable the circuit to work through the optocoupler U6.

[0022] The voltage adder circuit 6 consists of an operational amplifier U3. The 3rd pin of the operational amplifier U3 is respectively connected to a resistor R22 and a resistor R23 and receives the C-VSET signal and the IFB signal output by the MCU control module 3. The 1st pin of the operational amplifier U3 outputs the D-VSET signal.

[0023] In the above, the C-VSET signal output from the MCU control module 3 is received by the operational amplifier U3 to enable the conversion and output of the D-VSET signal.

[0024] The inverting output control circuit 7 consists of an operational amplifier U4. The 4th pin of the operational amplifier U4 is respectively connected to a resistor R25 and receives the C-ISET signal output by the MCU control module 3. The 1st pin of the operational amplifier U4 outputs the D-ISET signal.

[0025] In the above, the C-ISET signal output from the MCU control module 3 is received by the operational amplifier U4 to enable the conversion and output of the D-ISET signal.

[0026] The voltage and current acquisition circuit 8 consists of an operational amplifier U5A and an operational amplifier U5B. The 1st pin of the operational amplifier U5A is connected to a resistor R28 and connected to the MCU control module 3. The 2nd and 3rd pins of the operational amplifier U5A are respectively connected to a resistor R31 and a resistor R32 and receive the VS- signal and the VS+ signal. The 7th pin of the operational amplifier U5B is connected to a resistor R27 and connected to the MCU control module 3. The 5th and 6th pins of the operational amplifier U5B are respectively connected to a resistor R35 and a resistor R34 and receive the IS- signal and the IS+ signal.

[0027] Among the above, the operational amplifiers U5A and U5B are used to collect the VFB signal and the IFB signal in the circuit and send them back to the MCU control module 3 for real-time monitoring of the output.

[0028] For this regulated power supply and current stabilizing circuit with a built-in absorption circuit, when in the constant voltage and constant current charger mode output, the switching power supply module 1 supplies power to the MCU control module 3 and the DCDC control module 2. The MCU control module 3 sends a signal P-VSET according to requirements to control the DCDC control module 2 to output a value about 1V higher than that of the subsequent constant voltage and constant current control circuit 4, to protect the MOS transistor Q1 in the constant voltage and constant current control circuit 4 from being damaged due to excessive power consumption. At the same time, the D-COM signal output by the MCU control module 3 enables the MOS transistor Q2 to turn off, and the output C-VSET signal and C-ISET signal enable the DCDC control module 2 to output in the charger mode.

[0029] When in the constant voltage and constant current load mode absorption, the switching power supply module 1 supplies power to the MCU control module 3 and the DCDC control module 2. The MCU control module 3 sends a signal P-VSET according to requirements to turn off the output of the DCDC control module 2. At the same time, the signal C-VSET output by the MCU control module 3 is converted into a D-VSET signal output through the voltage adder circuit 6, and the C-ISET signal is converted into a D-ISET signal output through the inverting output control circuit 7 to enable the constant voltage and constant current absorption control circuit to output in the load mode.

[0030] When in the constant voltage and constant current charger and load simultaneous enabling mode output, the switching power supply module 1 supplies power to the MCU control module 3 and the DCDC control module 2. The MCU control module 3 sends a signal P-VSET according to requirements to control the DCDC control module 2 to output a value about 1V higher than that of the subsequent constant voltage and constant current control circuit 4, to protect the MOS transistor Q1 in the constant voltage and constant current control circuit 4 from being damaged due to excessive power consumption. At the same time, the MCU control module 3 sends a signal D-COM to enable the MOS transistor Q2 to conduct, and sends the signals C-VSET and C-ISET. One way enables the DCDC control module 2 to output in the charger mode, and the other way the signal C-VSET is converted into a D-VSET signal output through the voltage adder circuit 6, and the signal C-ISET is converted into a D-ISET signal output through the inverting output control circuit 7 to enable the constant voltage and constant current absorption control circuit 5 to output in the load mode. In this mode, the output has the function of regulated power supply and current stabilizing output. If there is voltage at the external load terminal itself and the load voltage is greater than the voltage at the output terminal of the circuit of the present invention, the constant voltage and constant current absorption control circuit 5 will automatically enable to work, and clamp the output at the control points of the D-VSET signal and D-ISET signal. At the same time, in this mode, the corresponding time for voltage reduction will be accelerated and can be adjusted to be between 250 - 350uS.

[0031] This voltage-stabilized and current-stabilized circuit with a built-in absorption circuit uses a combination of a switching power supply module 1 and a DCDC control module 2 for the front-end power supply control, which can effectively reduce the voltage drop power consumption of the subsequent MOS transistor. The MCU control circuit 3 outputs C-VSET signals and C-ISET signals to control the subsequent output, making the debugging process simple and saving production costs. The constant voltage and constant current control circuit 4 and the constant voltage and constant current absorption control circuit 5 are combined to output, which can achieve multiple-function constant voltage and constant current modes, outputs for the charger, the load, and the charger and the load enabled simultaneously, and can meet the requirements of different function tests of the protection board. Moreover, the constant voltage and constant current absorption control circuit 5 can effectively and quickly adjust and pull down the voltage and current values output by the constant voltage and constant current control circuit 4, so as to meet the requirements of the discharge under-voltage test of the protection board, and the module has a high integration degree, a simple debugging process, and can effectively reduce production costs.

[0032] In summary: This voltage-stabilized and current-stabilized circuit with a built-in absorption circuit realizes multiple-function constant voltage and constant current modes through the combination of the front-end switching power supply module 1 and DCDC control module 2, and the subsequent constant voltage and constant current control circuit 4 and constant voltage and constant current absorption control circuit 5. The outputs for the charger, the load, and the charger and the load enabled simultaneously can meet the requirements of different function tests of the protection board. And the module has a high integration degree, a simple debugging process, and can reduce production costs, thus effectively solving the problems of the prior art.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A voltage and current stabilizing circuit with a built-in absorption circuit, comprising a switching power supply module (1), a DCDC control module (2), an MCU control module (3), a constant voltage and constant current control circuit (4), a constant voltage and constant current absorption control circuit (5), a voltage adder circuit (6), an inverting output control circuit (7), and a voltage and current acquisition circuit (8), characterized in that: The output terminals of the switching power supply module (1) are respectively connected to the input terminals of the DCDC control module (2) and the MCU control module (3). The output terminal of the DCDC control module (2) is connected to the input terminal of the constant voltage and constant current control circuit (4). The output terminal of the MCU control module (3) is respectively connected to the input terminals of the DCDC control module (2), the constant voltage and constant current control circuit (4), the constant voltage and constant current absorption control circuit (5), the voltage adder circuit (6) and the inverting output control circuit (7). The output terminals of the voltage adder circuit (6) and the inverting output control circuit (7) are connected to the input terminal of the constant voltage and constant current absorption control circuit (5). The output terminal of the voltage and current acquisition circuit (8) is respectively connected to the input terminals of the MCU control module (3), the constant voltage and constant current control circuit (4) and the constant voltage and constant current absorption control circuit (5). The constant voltage and constant current control circuit (4) is composed of an operational amplifier U1A, an operational amplifier U1B and a MOS transistor Q1. The pin 2 of the operational amplifier U1A is connected to a resistor R4 and receives the C-VSET signal output by the MCU control module (3). The pin 3 of the operational amplifier U1A is connected to a resistor R5 and receives the VFB signal output by the MCU control module (3). The pin 1 of the operational amplifier U1A is connected to the parallel-connected resistors R1 and D1, and at the same time, the diode D1 is connected to a resistor R3 and connected to the gate of the MOS transistor Q1. The pin 6 of the operational amplifier U1B is connected to a resistor R6 and receives the C-ISET signal output by the MCU control module (3). The pin 5 of the operational amplifier U1B is connected to a resistor R7 and receives the IFB signal output by the MCU control module (3). The pin 7 of the operational amplifier U1B is connected to the parallel-connected resistors R2 and D2, and at the same time, the diode D2 is connected to a resistor R8 and connected to the gate of the MOS transistor Q1. The constant voltage and constant current absorption control circuit (5) is composed of an operational amplifier U2A, an operational amplifier U2B and an optocoupler U6. The pin 2 of the operational amplifier U2A is connected to a resistor R9 and receives the D-VSET signal output by the MCU control module (3). The pin 3 of the operational amplifier U2A is connected to a resistor R10 and receives the VFB signal output by the MCU control module (3). The pin 1 of the operational amplifier U2A is connected to the parallel-connected resistors R11 and D3, and at the same time, the diode D3 is connected to a resistor R12 and connected to the pin 4 of the optocoupler U6. The pin 6 of the operational amplifier U2B is connected to a resistor R13 and receives the D-ISET signal output by the MCU control module (3). The pin 5 of the operational amplifier U2B is connected to a resistor R14 and receives the IFB signal output by the MCU control module (3). The pin 7 of the operational amplifier U2B is connected to the parallel-connected resistors R15 and D4, and at the same time, the diode D4 is connected to a resistor R16 and connected to the pin 2 of the optocoupler U6.

2. The voltage and current stabilizing circuit with a built-in absorption circuit according to claim 1, characterized in that: The voltage adder circuit (6) is composed of an operational amplifier U3. The pin 3 of the operational amplifier U3 is respectively connected to a resistor R22 and a resistor R23 and receives the C-VSET signal and the IFB signal output by the MCU control module (3). The pin 1 of the operational amplifier U3 outputs the D-VSET signal.

3. The voltage and current stabilizing circuit with a built-in absorption circuit according to claim 1, characterized in that: The inverting output control circuit (7) is composed of an operational amplifier U4. The 4th pin of the operational amplifier U4 is respectively connected to a resistor R25 and receives the C-ISET signal output by the MCU control module (3), and the 1st pin of the operational amplifier U4 outputs the D-ISET signal.

4. A voltage and current stabilizing circuit with a built-in absorption circuit according to claim 1, characterized in that: The voltage and current acquisition circuit (8) is composed of an operational amplifier U5A and an operational amplifier U5B. The 1st pin of the operational amplifier U5A is connected to a resistor R28 and is connected to the MCU control module (3). The 2nd and 3rd pins of the operational amplifier U5A are respectively connected to a resistor R31 and a resistor R32 and receive the VS- signal and the VS+ signal. The 7th pin of the operational amplifier U5B is connected to a resistor R27 and is connected to the MCU control module (3). The 5th and 6th pins of the operational amplifier U5B are respectively connected to a resistor R35 and a resistor R34 and receive the IS- signal and the IS+ signal.

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