CN111478568A - Control circuit and control method for constant current source output voltage convex wave - Google Patents

Control circuit and control method for constant current source output voltage convex wave Download PDF

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Publication number
CN111478568A
CN111478568A CN202010258042.0A CN202010258042A CN111478568A CN 111478568 A CN111478568 A CN 111478568A CN 202010258042 A CN202010258042 A CN 202010258042A CN 111478568 A CN111478568 A CN 111478568A
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China
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voltage
control circuit
current
circuit
constant
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Inventor
李有财
邓秉杰
林德超
吴煌麒
陈兴
陈言祥
邱子凡
杨耀荣
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Fujian Nebula Electronics Co Ltd
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Fujian Nebula Electronics Co Ltd
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Priority to CN202010258042.0A priority Critical patent/CN111478568A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

The invention provides a control circuit and a control method for a constant current source to output a voltage convex wave.A processing circuit comprises a main control circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a voltage acquisition processing circuit and a discharge control circuit; the main control circuit is connected with the constant voltage and constant current control circuit, and the constant voltage and constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is respectively connected with the constant voltage and constant current control circuit, the main control circuit and the voltage acquisition processing circuit; the discharge control circuit is connected with the voltage acquisition and processing circuit; the voltage acquisition processing circuit is connected with the main control circuit; when the overcurrent protection test is carried out, the test load is respectively connected with the linear regulation control circuit, the voltage and current acquisition circuit and the discharge control circuit. The invention can effectively solve the problem of output voltage bulge wave caused by instant runaway of the whole circuit due to instant shutoff of current caused by disconnection of an output loop.

Description

Control circuit and control method for constant current source output voltage convex wave
Technical Field
The invention relates to the field of lithium battery pack testing, in particular to a control circuit and a control method for a constant current source to output a voltage convex wave.
Background
During the production process of the finished product of the lithium battery pack and the protection board thereof, the finished product of the lithium battery pack and the charging overcurrent protection of the protection board thereof are comprehensively tested. Along with the control of manufacturers on the cost, the withstand voltage value floating space of the finished product of the lithium battery pack and related devices used in a protection board of the finished product is controlled to be very small; when charging overcurrent protection is tested, the current is instantly turned off due to the disconnection of an output loop, the whole circuit can be instantly out of control to cause output voltage convex waves, the voltage convex waves are required to not exceed the withstand voltage values of the finished product of the lithium battery pack and related devices in the protection board, and otherwise, the related devices can be damaged.
In the prior art, there are two main voltage bump processing methods at present: the first is to require the output wiring impedance to be reduced to a certain value, and particularly, the output value can be set to be smaller by adjusting the voltage at the front end of the constant current source, so that the voltage bulge wave caused by the instant disconnection of the peripheral circuit output by the constant current source is relatively smaller; however, the adoption of the method for reducing the impedance of the output connection is a treatment method which is a radical treatment and not a radical treatment, and only can be established on the basis of setting the front-end voltage low point to reduce the output voltage convex wave to the maximum extent so as not to exceed the requirement. The second one is to adjust the regulation characteristic and the turn-off output index of the feedback circuit, sacrifice the response time characteristic of the loop and limit the voltage convex wave after the charging overcurrent protection as much as possible; however, adjusting the regulation characteristic of the feedback circuit is to slow down the rise time of the voltage bump at the expense of the corresponding time of the whole feedback circuit, and when the circuit is turned off rapidly, the whole usability of the circuit is limited, and the circuit is not suitable for some fields needing rapid protection and turn-off. Therefore, it is desirable to provide a voltage ripple processing scheme to effectively solve the problem that the current is instantly turned off due to the disconnection of the output circuit, so that the whole circuit is instantly out of control to cause the output voltage ripple and damage the related devices.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a control circuit and a control method for a constant current source to output a voltage convex wave, which are used for effectively solving the problems that the current is instantly turned off due to the disconnection of an output loop, so that the whole circuit is instantly out of control to cause the output voltage convex wave and damage related devices.
The invention is realized by the following steps: a control circuit for outputting voltage convex waves by a constant current source comprises a main control circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a voltage acquisition processing circuit and a discharge control circuit;
the main control circuit is connected with the constant voltage and constant current control circuit, and the constant voltage and constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is respectively connected with the constant voltage and constant current control circuit, the main control circuit and the voltage acquisition processing circuit; the discharge control circuit is connected with the voltage acquisition processing circuit; the voltage acquisition processing circuit is connected with the main control circuit;
when an overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit, the voltage and current acquisition circuit and the discharge control circuit;
when the linear regulation control circuit works, the constant voltage and constant current control circuit is triggered to output a high level through the enabling of the main control circuit, and the linear regulation control circuit is driven to output a voltage current value through the enabling of the high level; the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit feeds back the acquired voltage and current values to the constant-voltage and constant-current control circuit so that the constant-voltage and constant-current control circuit adjusts the voltage and current output of the linear regulation control circuit; the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to carry out real-time monitoring processing; the voltage and current acquisition circuit provides the acquired voltage value for the voltage acquisition processing circuit so that the voltage acquisition processing circuit enables the discharge control circuit to perform discharge processing in real time and feeds back the level in real time to be output to the main control circuit for monitoring processing.
Further, the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
the positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit, and the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel at the output end of the current operational amplifier, and the second diode is connected in parallel at the output end of the voltage operational amplifier.
Further, the linear regulation control circuit comprises a first MOS tube and a first resistor;
the G pole of the first MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the first MOS tube is connected with a power supply; the S pole of the first MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the first resistor is connected with the negative voltage sampling end and the positive current sampling end of the voltage and current acquisition circuit respectively, and the other end of the first resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
Further, the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
the input end of the voltage acquisition operational amplifier is connected with the two voltage output ends of the linear regulation control circuit, and the output ends of the voltage acquisition operational amplifier are respectively connected with the main control circuit, the voltage acquisition processing circuit and the constant voltage and constant current control circuit;
the input end of the current acquisition operational amplifier is connected with the two current acquisition ends of the linear regulation control circuit, and the output end of the current acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit.
Further, the voltage acquisition processing circuit comprises a fast comparator, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
the positive input end of the fast comparator is connected with the voltage and current acquisition circuit, and the output end of the fast comparator is respectively connected with the main control circuit and the release control circuit; one end of the second resistor is connected with the main control circuit, one end of the third resistor is connected with a reference power supply, one end of the fourth resistor is grounded, and the other ends of the second resistor, the third resistor and the fourth resistor are connected with the negative input end of the fast comparator; one end of the fifth resistor is connected with the output end of the fast comparator, and the other end of the fifth resistor is connected with a pull-up power supply.
Further, the bleeding control circuit comprises a second MOS transistor, a capacitor, a sixth resistor, and a seventh resistor;
the G pole of the second MOS tube is connected with the voltage acquisition and processing circuit; the D pole of the second MOS tube is connected with one end of the capacitor, and the sixth resistor is connected with the capacitor in parallel; one end of the seventh resistor is connected with the other end of the capacitor; and the S pole of the second MOS tube and the other end of the seventh resistor are both connected with the linear regulation control circuit.
Further, the main control circuit adopts a TMS320F28377S chip.
The invention is realized by the following steps: a control method for constant current source output voltage convex wave, the control method needs to use the control circuit, the control method includes:
setting a voltage output value V by the main control circuitsetAnd the current output value IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit; the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, the output high level is enabled to drive the first MOS tube in the linear regulation control circuit to be conducted, so that the voltage is outputA flow value;
the voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant-voltage and constant-current control circuit in real time so that the constant-voltage and constant-current control circuit adjusts and drives the conduction degree of a first MOS (metal oxide semiconductor) tube in the linear regulation control circuit, and the linear regulation control circuit stably outputs a required voltage and current value; the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so that the main control circuit can perform real-time monitoring processing; the voltage and current acquisition circuit feeds back the acquired voltage VFB signal to the voltage acquisition processing circuit in real time;
the voltage acquisition processing circuit compares the received voltage VFB signal with an internally set fixed voltage value in real time, and enables a fast comparator of the voltage acquisition processing circuit to output high-level pulses to the discharge control circuit when the rising change of the voltage VFB signal is greater than the set fixed voltage value; meanwhile, the voltage acquisition processing circuit feeds back the lifting change of the voltage VFB signal to the main control circuit for monitoring processing;
and after the discharge control circuit receives the high-level pulse, enabling a second MOS tube in the discharge control circuit to be conducted, so that the output voltage of the linear regulation control circuit is discharged and reduced.
The invention has the following advantages: according to the invention, the voltage acquisition processing circuit is used for comparing the acquired voltage value lifting change in real time, and outputting a high-level pulse when a voltage bump occurs, and the high-level pulse enables the discharge control circuit to discharge the output voltage of the linear regulation control circuit, so that the output voltage of the linear regulation control circuit is instantly reduced; therefore, the technical scheme of the invention can effectively solve the problem of output voltage bulge wave caused by instant runaway of the whole circuit due to instant current cut-off caused by the cut-off of the output loop.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit block diagram of a control circuit for outputting a convex wave of a voltage by a constant current source according to the present invention.
Fig. 2 is a circuit configuration diagram of the main control circuit of the present invention.
Fig. 3 is a circuit structure diagram of the constant voltage and constant current control circuit and the linear regulation control circuit of the present invention.
Fig. 4 is a circuit configuration diagram of the voltage current collecting circuit of the present invention.
Fig. 5 is a circuit structure diagram of the voltage acquisition processing circuit of the present invention.
Fig. 6 is a circuit configuration diagram of the bleed-off control circuit of the present invention.
Detailed Description
Referring to fig. 1 to 6, in a preferred embodiment of a control circuit 100 for outputting a voltage convex wave by a constant current source according to the present invention, the control circuit 100 includes a main control circuit 1, a constant voltage and constant current control circuit 2, a linear regulation control circuit 3, a voltage and current collection circuit 4, a voltage collection processing circuit 5, and a discharge control circuit 6;
the main control circuit 1 is connected with the constant voltage and constant current control circuit 2, and the constant voltage and constant current control circuit 2 is connected with the linear regulation control circuit 3; the voltage and current acquisition circuit 4 is respectively connected with the constant voltage and constant current control circuit 2, the main control circuit 1 and the voltage acquisition processing circuit 5; the discharge control circuit 6 is connected with the voltage acquisition processing circuit 5; the voltage acquisition processing circuit 5 is connected with the main control circuit 1;
when an overcurrent protection test is carried out, a test load 200 (namely a finished product of the lithium battery pack and a protective plate thereof) is respectively connected with the linear regulation control circuit 3, the voltage and current acquisition circuit 4 and the discharge control circuit 6;
when the circuit works, the constant-voltage constant-current control circuit 2 is triggered to output a high level through the enabling of the main control circuit 1, and the linear regulation control circuit 3 is driven to output a voltage current value through the enabling of the high level; the voltage and current acquisition circuit 4 acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit 4 feeds back the acquired voltage and current values to the constant voltage and constant current control circuit 2 so that the constant voltage and constant current control circuit 2 can adjust the voltage and current output of the linear regulation control circuit 3; the voltage and current acquisition circuit 4 provides the acquired voltage and current values for the main control circuit 1 to perform real-time monitoring processing, and during specific implementation, the main control circuit 1 performs processing such as collection, monitoring, display and the like on the received voltage and current values; the voltage and current acquisition circuit 4 provides the acquired voltage value for the voltage acquisition processing circuit 5, so that the voltage acquisition processing circuit 5 enables the discharge control circuit 6 to perform discharge processing in real time and feeds back the level in real time to be output to the main control circuit 1 for monitoring processing, and the main control circuit 1 can perform processing such as collection, monitoring, display and the like on the output level. The main control circuit is realized by adopting a TMS320F28377S chip.
In the present embodiment, please refer to fig. 3, wherein the constant voltage and constant current control circuit 2 includes a voltage operational amplifier N1A, a current operational amplifier N1B, a first diode D1 and a second diode D2;
the positive input ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the main control circuit 1; the negative input ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the voltage and current acquisition circuit 4; the output ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the linear regulation control circuit 3; the first diode D1 is connected in parallel at the output end of the current operational amplifier N1B, and the second diode D2 is connected in parallel at the output end of the voltage operational amplifier N1A. The voltage operational amplifier N1A and the current operational amplifier N1B can be realized by adopting an ADA4522-2 operational amplifier.
In the constant-voltage constant-current control circuit 2, two input ends of the voltage operational amplifier N1A are respectively provided with a resistor R7 and a resistor R11, and an output end of the voltage operational amplifier N1A is provided with a resistor R9; two input ends of the current operational amplifier N1B are respectively provided with a resistor R1 and a resistor R4, and an output end of the current operational amplifier N1B is provided with a resistor R2; the resistor R7, the resistor R11, the resistor R1 and the resistor R4 mainly play a matching role, and the resistor R9 and the resistor R2 mainly play a driving role. Wherein, the first diode D1 mainly plays a role of accelerating the turn-off and protection resistor R2, and the second diode D2 mainly plays a role of accelerating the turn-off and protection resistor R9.
When the constant voltage and constant current control circuit 2 works, when the constant voltage and constant current control circuit 2 receives the V set and output by the main control circuit 1setAnd IsetWhen the signal is sent, the voltage operational amplifier N1A and the current operational amplifier N1B are enabled to output high level to the linear regulation control circuit 3. When the constant voltage and constant current control circuit 2 receives the voltage VFB and current IFB signals fed back by the voltage and current acquisition circuit 4, the voltage operational amplifier N1A and the current operational amplifier N1B are enabled to adjust the output high level.
In the present embodiment, please refer to fig. 3, wherein the linear regulation control circuit 3 includes a first MOS transistor Q1 and a first resistor R6;
the G pole of the first MOS transistor Q1 is connected with the constant-voltage and constant-current control circuit 2, and the D pole of the first MOS transistor Q1 is connected with a power supply VCC; the S pole of the first MOS tube Q1 is connected with the positive voltage sampling end of the voltage and current acquisition circuit 4; one end of the first resistor R6 is connected to the negative voltage sampling terminal and the positive current sampling terminal of the voltage and current collecting circuit 4, respectively, and the other end of the first resistor R6 is connected to the ground GND and the negative current sampling terminal of the voltage and current collecting circuit 4, respectively. The third resistor R6 is mainly used for sampling.
When the linear regulation control circuit 3 works, the output end PV +/PV-of the linear regulation control circuit 3 needs to be connected to the test load 200 to load the voltage output by the linear regulation control circuit 3 to the test load 200 for testing, and when the linear regulation control circuit 3 receives the high level output by the constant voltage and constant current control circuit 2, the first MOS transistor Q1 is driven to be conducted, so that a voltage current value is output. Meanwhile, the first MOS transistor Q1 is driven to adjust the conduction degree according to the high level of the output regulated by the constant voltage and constant current control circuit 2, so as to realize stable output of the required voltage and current values.
In the present embodiment, please refer to fig. 4, wherein the voltage and current collecting circuit 4 includes a voltage collecting operational amplifier N2A and a current collecting operational amplifier N2B;
the input end of the voltage acquisition operational amplifier N2A is connected with two voltage output ends PV +/PV-of the linear regulation control circuit 3, and the output end of the voltage acquisition operational amplifier N2A is respectively connected with the main control circuit 1, the voltage acquisition processing circuit 5 and the constant voltage and constant current control circuit 2;
the input end of the current collecting operational amplifier N2B Is connected with two current collecting ends Is +/Is-of the linear regulation control circuit 3, and the output end of the current collecting operational amplifier N2B Is respectively connected with the main control circuit 1 and the constant voltage and constant current control circuit 5. The voltage acquisition operational amplifier N2A and the current acquisition operational amplifier N2B can be realized by adopting an ADA4522-2 operational amplifier.
In the voltage and current acquisition circuit 4, a resistor R15 is arranged at the negative input end of the voltage acquisition operational amplifier N2A, a resistor R13 and a resistor R12 are arranged at the positive input end of the voltage acquisition operational amplifier N2A in parallel, and one end of the resistor R12 is grounded to GND; the negative input end of the current collecting operational amplifier N2B is provided with a resistor R23, the positive input end of the voltage collecting operational amplifier N2B is provided with a resistor R20 and a resistor R18 in parallel, and one end of the resistor R18 is grounded GND; the output end of the voltage acquisition operational amplifier N2A is provided with a resistor R14, and a resistor R16 is arranged between the output end and the negative input end of the voltage acquisition operational amplifier N2A; the output end of the current collecting operational amplifier N2B is provided with a resistor R21, and a resistor R26 is arranged between the output end and the negative input end of the current collecting operational amplifier N2B; the resistor R12, the resistor R13, the resistor R15, the resistor R18, the resistor R20 and the resistor R23 mainly play a matching role, and the resistor R14, the resistor R16, the resistor R21 and the resistor R26 mainly play a driving role.
When the voltage and current acquisition circuit 4 works, the voltage output by the linear regulation control circuit 3 can be acquired through the voltage acquisition operational amplifier N2A, and the current of the first resistor R6 in the linear regulation control circuit 3 can be acquired through the current acquisition operational amplifier N2B; and respectively feeding back the collected voltage VFB and current IFB signals to the main control circuit 1, the voltage collection processing circuit 5 and the constant voltage and constant current control circuit 2.
In the present embodiment, please refer to fig. 5, wherein the voltage collecting and processing circuit 5 includes a fast comparator N3A, a second resistor R27, a third resistor R24, a fourth resistor R25, and a fifth resistor R17;
the positive input end of the fast comparator N3A is connected to the voltage and current collecting circuit 4, and the output end of the fast comparator N3A is connected to the main control circuit 1 and the bleeding control circuit 6, respectively; one end of the second resistor R27 is connected to the main control circuit 1, one end of the third resistor R24 is connected to a reference power source VREF, one end of the fourth resistor R25 is grounded GND, and the other ends of the second resistor R27, the third resistor R24 and the fourth resistor R25 are connected to a negative input terminal of the fast comparator N3A; one end of the fifth resistor R17 is connected to the output end of the fast comparator N3A, and the other end is connected to a pull-up power supply VCCD.
The fast comparator N3A is mainly used to compare the rising change of the VFB signal fed back by the voltage and current collecting circuit 4 with an internally set fixed voltage value Vset-FB, and output a corresponding level according to the comparison result, and the fast comparator N3A may adopt an SGM8745 comparator; the second resistor R27, the third resistor R24 and the fourth resistor R25 mainly play a role in matching voltage division; the fifth resistor R17 functions as a pull-up voltage.
In the voltage acquisition processing circuit 5, a negative input end of the fast comparator N3A is provided with a resistor R19, and a positive input end of the fast comparator N3A is provided with a resistor R22; the resistor R19 and the resistor R22 mainly serve as matching.
When the voltage acquisition processing circuit 5 works, the rising change of the voltage VFB signal fed back by the voltage current acquisition circuit 4 is compared with an internally set fixed voltage value Vset-FB in real time, and if the rising change of the voltage VFB signal is greater than the internally set fixed voltage value Vset-FB, a high-level pulse is output; if the rising change of the voltage VFB signal is less than or equal to the internally set fixed voltage value Vset-FB, a low-level pulse is output; meanwhile, a level pulse is also output to the main control circuit 1 and the bleeding control circuit 6.
In the present embodiment, please refer to fig. 6, wherein the bleeder control circuit 6 includes a second MOS transistor Q2, a capacitor C1, a sixth resistor R5, and a seventh resistor R3;
the G pole of the second MOS tube Q2 is connected with the voltage acquisition processing circuit 5; the D pole of the second MOS transistor Q2 is connected with one end of the capacitor C1, and the sixth resistor R5 is connected with the capacitor C1 in parallel; one end of the seventh resistor R3 is connected with the other end of the capacitor C1; the S pole of the second MOS transistor Q2 and the other end of the seventh resistor R3 are both connected with the linear regulation control circuit 3.
In the bleeder control circuit 6, the G-pole of the second MOS transistor Q2 is further connected to a resistor R8 and a resistor R10, respectively, and one end of the resistor R10 is grounded GND; the resistor R8 and the resistor R10 mainly function as driving.
When the discharge control circuit 6 works, after the discharge control circuit 6 receives the high level pulse output by the voltage acquisition processing circuit 5, the second MOS transistor Q2 is enabled to be turned on, so that the output voltage of the linear regulation control circuit 3 is discharged and lowered, and the purpose of reducing and controlling the voltage bulge wave output due to instantaneous runaway of the whole circuit caused by instantaneous turn-off of current due to the turn-off of an output loop is achieved.
The present invention further provides a control method for a constant current source to output a convex voltage wave, where the control circuit 100 is required to be used in the control method, and the control method includes:
setting a voltage output value V by the main control circuit 1setAnd the current output value IsetV can be set according to actual output requirementssetAnd IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit 2; the constant voltage and constant current control circuit 2 receives VsetAnd IsetAfter the signal, enabling to output a high level to drive a first MOS tube Q1 in the linear regulation control circuit 3 to be conducted, thereby outputting a voltage current value;
the voltage and current acquisition circuit 4 acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit 4 feeds back acquired voltage VFB and IFB current signals to the constant voltage and constant current control circuit 2 in real time, so that the constant voltage and constant current control circuit 2 adjusts and drives the conduction degree of a first MOS transistor Q1 in the linear regulation control circuit 3, and the linear regulation control circuit 3 stably outputs a required voltage and current value; the voltage and current acquisition circuit 4 feeds back acquired voltage VFB and current IFB signals to the main control circuit 1 in real time, so that the main control circuit 1 performs real-time monitoring processing (specifically, processing such as collection, monitoring and display can be performed); the voltage and current acquisition circuit 4 feeds back the acquired voltage VFB signal to the voltage acquisition processing circuit 5 in real time;
the voltage acquisition processing circuit 5 compares the received voltage VFB signal with an internally set fixed voltage value Vset-FB in real time, and enables the fast comparator N3A of the voltage acquisition processing circuit 5 to output a high-level pulse to the bleeding control circuit 6 when the rising change of the voltage VFB signal is greater than the set fixed voltage value Vset-FB; meanwhile, the voltage acquisition and processing circuit 5 feeds back the lifting change of the voltage VFB signal to the main control circuit 1 for monitoring (specifically, collection, monitoring, display and the like can be performed); in practical implementation, when the external circuit is not turned off, the rising change of the VFB signal collected by the voltage and current collecting circuit 4 is not greater than the fixed voltage value Vset-FB, and therefore, the fast comparator N3A outputs a low-level pulse. When the external circuit is disconnected and the current is instantly turned off, the linear regulation control circuit 4 is out of control, and the output voltage V + of the linear regulation control circuit 4 is instantly pulled high at the moment, so that a convex wave is formed; at this time, the rising change of the VFB signal collected by the voltage/current collecting circuit 4 is greater than the fixed voltage value Vset-FB, so the fast comparator N3A outputs a high-level pulse.
After the leakage control circuit 6 receives the high-level pulse, the second MOS transistor Q2 in the leakage control circuit 6 is enabled to be turned on, so that the output voltage V + of the linear regulation control circuit 3 is reduced by leakage, and the purpose of reducing the output voltage bulge wave caused by instantaneous runaway of the whole circuit due to instantaneous current shutoff caused by the fact that the output circuit is turned off in the reduction control is achieved.
In summary, the voltage acquisition processing circuit is used for comparing the acquired voltage value rise change in real time, outputting a high-level pulse when a voltage bump occurs, enabling the discharge control circuit to discharge the output voltage of the linear regulation control circuit through the high-level pulse, and thus instantly reducing the output voltage of the linear regulation control circuit; therefore, the technical scheme of the invention can effectively solve the problem of output voltage bulge wave caused by instant runaway of the whole circuit due to instant current cut-off caused by the cut-off of the output loop.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.

Claims (8)

1. A control circuit for constant current source output voltage convex wave is characterized in that: the device comprises a main control circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a voltage acquisition processing circuit and a discharge control circuit;
the main control circuit is connected with the constant voltage and constant current control circuit, and the constant voltage and constant current control circuit is connected with the linear regulation control circuit; the voltage and current acquisition circuit is respectively connected with the constant voltage and constant current control circuit, the main control circuit and the voltage acquisition processing circuit; the discharge control circuit is connected with the voltage acquisition processing circuit; the voltage acquisition processing circuit is connected with the main control circuit;
when an overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit, the voltage and current acquisition circuit and the discharge control circuit;
when the linear regulation control circuit works, the constant voltage and constant current control circuit is triggered to output a high level through the enabling of the main control circuit, and the linear regulation control circuit is driven to output a voltage current value through the enabling of the high level; the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit feeds back the acquired voltage and current values to the constant-voltage and constant-current control circuit so that the constant-voltage and constant-current control circuit adjusts the voltage and current output of the linear regulation control circuit; the voltage and current acquisition circuit provides the acquired voltage and current values for the main control circuit to carry out real-time monitoring processing; the voltage and current acquisition circuit provides the acquired voltage value for the voltage acquisition processing circuit so that the voltage acquisition processing circuit enables the discharge control circuit to perform discharge processing in real time and feeds back the level in real time to be output to the main control circuit for monitoring processing.
2. The control circuit according to claim 1, wherein: the constant voltage and constant current control circuit comprises a voltage operational amplifier, a current operational amplifier, a first diode and a second diode;
the positive input ends of the voltage operational amplifier and the current operational amplifier are connected with the main control circuit, and the negative input ends of the voltage operational amplifier and the current operational amplifier are connected with the voltage and current acquisition circuit; the output ends of the voltage operational amplifier and the current operational amplifier are connected with the linear regulation control circuit; the first diode is connected in parallel at the output end of the current operational amplifier, and the second diode is connected in parallel at the output end of the voltage operational amplifier.
3. The control circuit according to claim 1, wherein: the linear regulation control circuit comprises a first MOS tube and a first resistor;
the G pole of the first MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the first MOS tube is connected with a power supply; the S pole of the first MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the first resistor is connected with the negative voltage sampling end and the positive current sampling end of the voltage and current acquisition circuit respectively, and the other end of the first resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
4. The control circuit according to claim 1, wherein: the voltage and current acquisition circuit comprises a voltage acquisition operational amplifier and a current acquisition operational amplifier;
the input end of the voltage acquisition operational amplifier is connected with the two voltage output ends of the linear regulation control circuit, and the output ends of the voltage acquisition operational amplifier are respectively connected with the main control circuit, the voltage acquisition processing circuit and the constant voltage and constant current control circuit;
the input end of the current acquisition operational amplifier is connected with the two current acquisition ends of the linear regulation control circuit, and the output end of the current acquisition operational amplifier is respectively connected with the main control circuit and the constant voltage and constant current control circuit.
5. The control circuit according to claim 1, wherein: the voltage acquisition processing circuit comprises a fast comparator, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
the positive input end of the fast comparator is connected with the voltage and current acquisition circuit, and the output end of the fast comparator is respectively connected with the main control circuit and the release control circuit; one end of the second resistor is connected with the main control circuit, one end of the third resistor is connected with a reference power supply, one end of the fourth resistor is grounded, and the other ends of the second resistor, the third resistor and the fourth resistor are connected with the negative input end of the fast comparator; one end of the fifth resistor is connected with the output end of the fast comparator, and the other end of the fifth resistor is connected with a pull-up power supply.
6. The control circuit according to claim 1, wherein: the discharge control circuit comprises a second MOS tube, a capacitor, a sixth resistor and a seventh resistor;
the G pole of the second MOS tube is connected with the voltage acquisition and processing circuit; the D pole of the second MOS tube is connected with one end of the capacitor, and the sixth resistor is connected with the capacitor in parallel; one end of the seventh resistor is connected with the other end of the capacitor; and the S pole of the second MOS tube and the other end of the seventh resistor are both connected with the linear regulation control circuit.
7. The control circuit according to claim 1, wherein: the main control circuit adopts a TMS320F28377S chip.
8. A control method for constant current source output voltage convex wave is characterized in that: the control method is to use the control circuit according to any one of claims 1 to 7, and the control method comprises the following steps:
setting a voltage output value V by the main control circuitsetAnd the current output value IsetWill VsetAnd IsetThe signal is output to the constant voltage and constant current control circuit; the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, enabling to output a high level to drive a first MOS tube in the linear regulation control circuit to be conducted, thereby outputting a voltage current value;
the voltage and current acquisition circuit acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit feeds back acquired voltage VFB and IFB current signals to the constant-voltage and constant-current control circuit in real time so that the constant-voltage and constant-current control circuit adjusts and drives the conduction degree of a first MOS (metal oxide semiconductor) tube in the linear regulation control circuit, and the linear regulation control circuit stably outputs a required voltage and current value; the voltage and current acquisition circuit feeds back acquired voltage VFB and current IFB signals to the main control circuit in real time so that the main control circuit can perform real-time monitoring processing; the voltage and current acquisition circuit feeds back the acquired voltage VFB signal to the voltage acquisition processing circuit in real time;
the voltage acquisition processing circuit compares the received voltage VFB signal with an internally set fixed voltage value in real time, and enables a fast comparator of the voltage acquisition processing circuit to output high-level pulses to the discharge control circuit when the rising change of the voltage VFB signal is greater than the set fixed voltage value; meanwhile, the voltage acquisition processing circuit feeds back the lifting change of the voltage VFB signal to the main control circuit for monitoring processing;
and after the discharge control circuit receives the high-level pulse, enabling a second MOS tube in the discharge control circuit to be conducted, so that the output voltage of the linear regulation control circuit is discharged and reduced.
CN202010258042.0A 2020-04-03 2020-04-03 Control circuit and control method for constant current source output voltage convex wave Pending CN111478568A (en)

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CN202010258042.0A CN111478568A (en) 2020-04-03 2020-04-03 Control circuit and control method for constant current source output voltage convex wave

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010258042.0A CN111478568A (en) 2020-04-03 2020-04-03 Control circuit and control method for constant current source output voltage convex wave

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CN111478568A true CN111478568A (en) 2020-07-31

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