CN111458542A - Processing circuit and processing method for constant current source output voltage convex wave - Google Patents

Processing circuit and processing method for constant current source output voltage convex wave Download PDF

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Publication number
CN111458542A
CN111458542A CN202010258146.1A CN202010258146A CN111458542A CN 111458542 A CN111458542 A CN 111458542A CN 202010258146 A CN202010258146 A CN 202010258146A CN 111458542 A CN111458542 A CN 111458542A
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China
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voltage
circuit
current
control circuit
output
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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 CN202010258146.1A priority Critical patent/CN111458542A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

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  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a processing circuit and a processing method for constant current source output voltage bulge waves, wherein the processing circuit comprises a main control circuit, a front-end switch power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition processing circuit and a front-end voltage output adjusting circuit; the main control circuit is respectively connected with a front-end switch power supply BACK circuit, a constant voltage and constant current control circuit, a voltage and current acquisition circuit and a current acquisition processing circuit; the front end voltage output adjusting circuit is respectively connected with the linear regulation control circuit, the front end switch power supply BACK circuit and the current acquisition processing circuit; the voltage and current acquisition circuit is respectively connected with the constant voltage and constant current control circuit and the current acquisition processing circuit; the constant voltage and constant current control circuit is connected with the linear regulation control circuit. The invention can effectively solve the problem that the output voltage bulge wave is caused by the instant runaway of the whole circuit because the current is instantly cut off when the output loop is disconnected.

Description

Processing circuit and processing 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 processing circuit and a processing method for a constant current source output 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 invention aims to solve the technical problem of providing a processing circuit and a processing method for a constant current source output 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 processing circuit for constant current source output voltage bulge waves comprises a main control circuit, a front-end switch power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition processing circuit and a front-end voltage output adjusting circuit;
the main control circuit is connected with the front-end switching power supply BACK circuit, and the front-end switching power supply BACK circuit is connected with the front-end voltage output adjusting circuit; the constant voltage and constant current control circuit is connected with the main control circuit; the linear regulation control circuit is connected with the constant voltage and constant current control circuit; the voltage and current acquisition circuit is respectively connected with the main control circuit, the constant voltage and constant current control circuit and the current acquisition processing circuit; the current acquisition processing circuit is respectively connected with the main control circuit and the front end voltage output adjusting circuit; the front end voltage output adjusting circuit is connected with the linear regulation control circuit;
when an overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit and the voltage and current acquisition circuit;
when the constant-voltage constant-current control circuit works, the main control circuit controls the power supply output of the BACK circuit of the front-end switching power supply and controls the driving level output of the constant-voltage constant-current control circuit; the current acquisition processing circuit and the front end voltage output adjusting circuit control the front end voltage to be output; the front end voltage output adjusting circuit and the constant voltage and constant current control circuit control the linear adjustment output of the linear adjustment control circuit together; the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit provides acquired voltage and current values for the main control circuit to perform real-time monitoring processing, the voltage and current acquisition circuit provides the acquired voltage and current values for the constant voltage and constant current control circuit to perform real-time feedback regulation and output high level drive to the main control circuit, and the voltage and current acquisition circuit provides the acquired current values for the current acquisition processing circuit to perform real-time comparison processing; the current acquisition processing circuit provides the output level to the main control circuit for real-time monitoring processing.
Further, the front-end switch power supply BACK circuit comprises a driver, an isolation driving inductor, a first MOS (metal oxide semiconductor) tube, a second MOS tube and an energy storage inductor;
the input end of the driver is connected with the main control circuit, and the input end of the isolation driving inductor is connected with the output end of the driver; the isolation driving inductor is provided with two paths of outputs, wherein one path of output is respectively connected with the G pole and the S pole of the first MOS tube, the D pole of the first MOS tube is connected with a power supply, the other path of output is respectively connected with the G pole and the S pole of the second MOS tube, and the S pole of the second MOS tube is grounded; and the S pole of the first MOS tube and the D pole of the second MOS tube are both connected with the input end of the energy storage inductor, and the output end of the energy storage inductor is connected with the front end voltage output adjusting circuit.
Furthermore, the front-end voltage output adjusting circuit comprises a first capacitor, a third MOS tube, a fourth MOS tube, a first resistor and a second resistor;
one end of the first capacitor is connected with the current acquisition and processing circuit, and the other end of the first capacitor is connected with the G pole of the third MOS tube; the D pole of the third MOS tube is connected with the G pole of the fourth MOS tube; the BACK circuit of the front-end switching power supply is connected with the D pole of the fourth MOS tube, and the D pole of the fourth MOS tube is connected with the S pole of the fourth MOS tube through the first resistor; one end of the second resistor is connected with the S pole of the fourth MOS tube, and the other end of the second resistor is grounded with the S pole of the third MOS tube.
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; 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 fifth MOS transistor and a third resistor;
the G pole of the fifth MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the fifth MOS tube is connected with the front-end voltage output adjusting circuit; the S pole of the fifth MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the third 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 third 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 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, the current acquisition processing circuit and the constant voltage and constant current control circuit.
Further, the current acquisition processing circuit comprises a fast comparator, a fourth resistor, a fifth resistor and a sixth resistor;
the negative input end of the rapid comparator is connected with the voltage and current acquisition circuit; one end of the fourth resistor is connected with the reference voltage, one end of the fifth resistor is grounded, and the other ends of the fourth resistor and the fifth resistor are both connected with the positive input end of the fast comparator; the output end of the rapid comparator is respectively connected with the main control circuit and the front end voltage output adjusting circuit; one end of the sixth resistor is connected with the output end of the fast comparator, and the other end of the sixth resistor is connected with a pull-up power supply.
Further, the main control circuit adopts a TMS320F28377S chip.
The invention is realized by the following steps: a processing method for a convex wave of an output voltage of a constant current source needs to use the processing circuit, and the processing 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; meanwhile, PWMA and PWMB signals are output to the BACK circuit of the front-end switching power supply through the main control circuit;
after receiving the PWMA and PWMB signals, the BACK circuit of the front-end switching power supply enables to drive a first MOS tube and a second MOS tube in the BACK circuit of the front-end switching power supply to be conducted so as to output a voltage VPP signal to the front-end voltage output adjusting circuit; after the front-end voltage output adjusting circuit receives the voltage VPP signal, a fourth MOS tube in the front-end voltage output adjusting circuit is driven to be conducted so as to output a voltage VCC signal to the linear regulation control circuit;
the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, the voltage operational amplifier and the current operational amplifier of the constant-voltage constant-current control circuit are enabled to output high voltageThe level is used for driving a fifth MOS tube in the linear regulation control circuit to be conducted, so that a voltage current value is output;
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 fifth MOS 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 acquired current IFB signals to the current acquisition processing circuit in real time; the current acquisition processing circuit compares the received current IFB signal with an internally set reserved value and enables a fast comparator of the current acquisition processing circuit to output a low-level pulse;
when the external loop is disconnected and the current is switched off, so that the linear regulation control circuit is out of control, the linear regulation control circuit directly outputs the voltage VCC in the front-end voltage output regulation circuit, and the output voltage forms a convex wave;
after the voltage and current acquisition circuit acquires the change of the voltage VFB and the current IFB in the loop, the change of the voltage VFB and the current IFB signals is fed BACK to the main control circuit, and the main control circuit enables the first MOS tube and the second MOS tube in the BACK circuit of the front-end switching power supply to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; meanwhile, the voltage and current acquisition circuit feeds back the change of the current IFB signal to the current acquisition processing circuit, the current acquisition processing circuit compares the received current IFB signal, enables a fast comparator of the current acquisition processing circuit to output a high level pulse to the front end voltage output adjusting circuit, enables a third MOS tube in the front end voltage output adjusting circuit to be switched on and a fourth MOS tube to be switched off through the high level pulse, and enables the voltage VPP input to the front end voltage output adjusting circuit to be divided by the first resistor and the second resistor and then output the voltage VCC.
The invention has the following advantages: according to the invention, the current collecting and processing circuit is used for comparing the collected current values in real time, and outputting high-level pulse when voltage bump occurs, so that the front-end voltage output adjusting circuit can quickly adjust the output voltage VCC; meanwhile, a first MOS tube and a second MOS tube in the BACK circuit of the front-end switching power supply are enabled to be driven to be switched off through the main control circuit, so that the voltage and current value output of the linear regulation control circuit is indirectly switched off; through the combined action of the two components, the problems that the current is instantly cut off due to the disconnection of an output loop, so that the instant runaway of the whole circuit causes the output voltage convex wave and damages related devices can be effectively solved.
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 processing 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 diagram of a BACK circuit of the front-end switching power supply of the present invention.
Fig. 4 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. 5 is a circuit configuration diagram of the voltage current collecting circuit of the present invention.
Fig. 6 is a circuit configuration diagram of the current collection processing circuit of the present invention.
Fig. 7 is a circuit configuration diagram of the front-end voltage output adjusting circuit of the present invention.
Detailed Description
Referring to fig. 1 to 7, a preferred embodiment of a processing circuit 100 for processing a voltage bump output by a constant current source according to the present invention includes a main control circuit 1, a front-end switch power supply BACK circuit 2, a constant voltage and constant current control circuit 3, a linear regulation control circuit 4, a voltage and current acquisition circuit 5, a current acquisition processing circuit 6, and a front-end voltage output adjusting circuit 7;
the main control circuit 1 is connected with the front-end switch power supply BACK circuit 2, and the front-end switch power supply BACK circuit 2 is connected with the front-end voltage output adjusting circuit 7; the constant voltage and constant current control circuit 3 is connected with the main control circuit 1; the linear regulation control circuit 4 is connected with the constant voltage and constant current control circuit 3; the voltage and current acquisition circuit 5 is respectively connected with the main control circuit 1, the constant voltage and constant current control circuit 3 and the current acquisition processing circuit 6; the current acquisition processing circuit 6 is respectively connected with the main control circuit 1 and the front end voltage output adjusting circuit 7; the front end voltage output adjusting circuit 7 is connected with the linear regulation control circuit 4;
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 4 and the voltage and current acquisition circuit 5;
when the constant-voltage constant-current control circuit works, the main control circuit 1 is used for controlling the power supply output of the front-end switch power supply BACK circuit 2 and controlling the driving level output of the constant-voltage constant-current control circuit 3; the current acquisition processing circuit 6 and the front end voltage output adjusting circuit 7 control the front end voltage to be output; the front end voltage output adjusting circuit 7 and the constant voltage and constant current control circuit 3 together control the linear adjustment output of the linear adjustment control circuit 4; the voltage and current acquisition circuit 5 acquires the voltage and current value on the loop in real time; the voltage and current acquisition circuit 5 provides the acquired voltage and current values to the main control circuit 1 for real-time monitoring processing, when the real-time monitoring processing is implemented, the main control circuit 1 can collect, monitor, display and the like the received voltage and current values, the voltage and current acquisition circuit 5 provides the acquired voltage and current values to the constant voltage and constant current control circuit 3 for real-time feedback regulation and output of high level drive to the main control circuit 1, and the voltage and current acquisition circuit 5 provides the acquired current values to the current acquisition processing circuit 6 for real-time comparison processing; the current acquisition processing circuit 6 provides the output level for the main control circuit 1 to carry out real-time monitoring processing, and the main control circuit 1 can carry out processing such as collection, monitoring, display and the like on the output level. The main control circuit 1 is realized by adopting a TMS320F28377S chip.
In the present embodiment, please refer to fig. 3, wherein the front-end switch power BACK circuit 2 includes a driver U6, an isolation driving inductor T1, a first MOS transistor Q4, a second MOS transistor Q5, and an energy storage inductor L1;
the input end of the driver U6 is connected with the main control circuit 1, the input end of the isolation driving inductor T1 is connected with the output end of the driver U6, the isolation driving inductor T1 has two paths of outputs, wherein one path of output is respectively connected with the G pole and the S pole of the first MOS transistor Q4, the D pole of the first MOS transistor Q4 is connected with a POWER supply POWER, the other path of output is respectively connected with the G pole and the S pole of the second MOS transistor Q5, the S pole of the second MOS transistor Q5 is grounded GND, the S pole of the first MOS transistor Q4 and the D pole of the second MOS transistor Q5 are both connected with the input end of the energy storage inductor L1, and the output end of the energy storage inductor L1 is connected with the front-end voltage output adjusting circuit 7, wherein the driver U6 is mainly used for enhancing signals, the isolation driving inductor T1 is mainly used for outputting two groups of signals which are mutually isolated, and the energy storage L1 is mainly used for storing energy.
In the front-end switching power supply BACK circuit 2, the driver U6 is realized by adopting a UCC27424 chip, a pin 1 of the UCC27424 chip is connected with a PWMA signal output pin of a TMS320F28377S chip, a pin 4 of the UCC27424 chip is connected with a PWMB signal output pin of the TMS320F28377S chip, a pin 5 and a pin 7 of the UCC27424 chip are respectively connected with two input ends of an isolation driving inductor T1, a capacitor C3 is further arranged between the pin 7 of the UCC27424 chip and the input end of the isolation driving inductor T1, the capacitor C3 mainly plays a role of isolating direct current, resistors R31 and R7378 and resistors R29 and R30 are respectively arranged on two paths of output of the isolation driving inductor T1, wherein the resistors R31 and R29 play a role of controlling corresponding time of a driving rising edge, the resistors R32 and R30 mainly play a role of a bleeder Q686Q 27, the second pole 46Q 27 and the dummy resistor S46Q 465 and the resistor S465 and the dummy resistor S465 are respectively connected with a load output end of the load 28, wherein the dummy resistor C465 and the dummy resistor C5965 can play a role of storing a role of filtering function of filtering capacitor C465.
When the front-end switch power supply BACK circuit 2 works, the driver U6 carries out enhancement processing on a PWMA signal and a PWMB signal output by the main control circuit 1, the PWMA signal and the PWMB signal after the enhancement processing are output to the isolation driving inductor T1, the isolation driving inductor T1 divides the PWMA signal and the PWMB signal into two groups of complementary isolated BPWMA/BPWM-A and BPWMB/BPWM-B signals, respectively drives the first MOS tube Q4 and the second MOS tube Q5 to be conducted, and further outputs voltage to the front-end voltage output adjusting circuit 7 through the energy storage inductor L1, and meanwhile, during specific implementation, the adjustment of the output voltage VPP of the front-end switch power supply BACK circuit 2 can be realized by adjusting the duty ratio of the PWMA signal and the PWMB signal output by the main control circuit 1.
In the present embodiment, please refer to fig. 7, wherein the front-end voltage output adjusting circuit 7 includes a first capacitor C1, a third MOS transistor Q3, a fourth MOS transistor Q2, a first resistor R1, and a second resistor R6;
one end of the first capacitor C1 is connected to the current collection processing circuit 6, and the other end of the first capacitor C1 is connected to the G-pole of the third MOS transistor Q3; the D pole of the third MOS transistor Q3 is connected with the G pole of the fourth MOS transistor Q2; the front-end switching power supply BACK circuit 2 is connected with the D pole of the fourth MOS transistor Q2, and the D pole of the fourth MOS transistor Q2 is connected with the S pole of the fourth MOS transistor Q2 through the first resistor R1; one end of the second resistor R6 is connected to the S-pole of the fourth MOS transistor Q2, and the other end of the second resistor R6 is connected to the S-pole of the third MOS transistor Q3 and grounded GND. The first capacitor C1 mainly plays a role in isolating direct-current voltage control; the first resistor R1 and the second resistor R6 mainly play a role of voltage division.
In the front-end voltage output adjusting circuit 7, a resistor R8 is further disposed between the first capacitor C1 and the G pole of the third MOS transistor Q3, a resistor R9 is further disposed between the G pole and the S pole of the third MOS transistor Q3, a resistor R5 is further disposed between the D pole and the G pole of the fourth MOS transistor Q2, and the resistor R8, the resistor R9, and the resistor R5 all play a role in driving.
When the front-end voltage output adjusting circuit 7 works, in a default state, the third MOS transistor Q3 is in an off state, the fourth MOS transistor Q2 is in an on state, the first resistor R1 is used in a short circuit, and the second resistor R6 is used only as a dummy load, so that a voltage VPP signal passes through the front-end voltage output adjusting circuit 7 and then is output as VCC, and the voltage VCC is equal to the voltage VPP. When the first capacitor C1 receives the high-level pulse transmitted by the current collection processing circuit 6, the third MOS transistor Q3 can be turned on, and the fourth MOS transistor Q2 is indirectly controlled to be turned off, so that the voltage VPP signal is divided by the first resistor R1 and the second resistor R6, and then the voltage VCC is output.
In the present embodiment, please refer to fig. 4, wherein the constant voltage and constant current control circuit 3 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 5; the output ends of the voltage operational amplifier N1A and the current operational amplifier N1B are connected with the linear regulation control circuit 4; 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 3, two input ends of the voltage operational amplifier N1A are respectively provided with a resistor R10 and a resistor R12, and an output end of the voltage operational amplifier N1A is provided with a resistor R11; two input ends of the current operational amplifier N1B are respectively provided with a resistor R2 and a resistor R4, and an output end of the current operational amplifier N1B is provided with a resistor R3; the resistor R10, the resistor R12, the resistor R2 and the resistor R4 mainly play a matching role, and the resistor R11 and the resistor R3 mainly play a driving role. Wherein, the first diode D1 mainly plays a role of accelerating the turn-off and protection resistor R3, and the second diode D2 mainly plays a role of accelerating the turn-off and protection resistor R11.
When the constant voltage and constant current control circuit 3 works, when the constant voltage and constant current control circuit 3 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 4. When the constant voltage and constant current control circuit 3 receives the voltage VFB and current IFB signals fed back by the voltage and current acquisition circuit 5, 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. 4, wherein the linear regulation control circuit 4 includes a fifth MOS transistor Q1 and a third resistor R7;
the G pole of the fifth MOS tube Q1 is connected with the constant-voltage constant-current control circuit 3, and the D pole of the fifth MOS tube Q1 is connected with the front-end voltage output adjusting circuit 7; the S pole of the fifth MOS tube Q1 is connected with the positive voltage sampling end of the voltage and current acquisition circuit 5; one end of the third resistor R7 is connected to the negative voltage sampling terminal and the positive current sampling terminal of the voltage and current collecting circuit 5, respectively, and the other end of the third resistor R7 is connected to the ground GND and the negative current sampling terminal of the voltage and current collecting circuit 5, respectively; the third resistor R7 is mainly used for sampling.
When the linear regulation control circuit 4 works, the output end PV +/PV-of the linear regulation control circuit 4 needs to be connected to the test load 200 to realize that the output voltage is loaded on the test load 200 for testing; when the linear regulation control circuit 4 receives the high level output by the constant voltage and constant current control circuit 3, the fifth MOS transistor Q1 is driven to be turned on, so as to output a voltage current value. Meanwhile, the fifth 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 3, so as to realize stable output of the required voltage and current values.
In the present embodiment, please refer to fig. 5, wherein the voltage and current collecting circuit 5 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 4, and the output end of the voltage acquisition operational amplifier N2A is respectively connected with the main control circuit 1 and the constant voltage and constant current control circuit 3;
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 4, and the output end of the current collecting operational amplifier N2B Is respectively connected with the main control circuit 1, the current collecting processing circuit 6 and the constant voltage and constant current control circuit 3. 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 5, a resistor R16 is arranged at the negative input end of the voltage acquisition operational amplifier N2A, a resistor R14 and a resistor R13 are arranged at the positive input end of the voltage acquisition operational amplifier N2A in parallel, and one end of the resistor R13 is grounded to GND; the negative input end of the current collecting operational amplifier N2B is provided with a resistor R24, the positive input end of the voltage collecting operational amplifier N2B is provided with a resistor R21 and a resistor R19 in parallel, and one end of the resistor R19 is grounded GND; the output end of the voltage acquisition operational amplifier N2A is provided with a resistor R15, and a resistor R17 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 R23, and a resistor R27 is arranged between the output end and the negative input end of the current collecting operational amplifier N2B; the resistor R13, the resistor R14, the resistor R16, the resistor R19, the resistor R21 and the resistor R24 mainly play a matching role, and the resistor R15, the resistor R17, the resistor R23 and the resistor R27 mainly play a driving role.
When the voltage and current acquisition circuit 5 works, the voltage output by the linear regulation control circuit 4 can be acquired through the voltage acquisition operational amplifier N2A, and the current of a third resistor R7 in the linear regulation control circuit 4 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 current collection processing circuit 6 and the constant voltage and constant current control circuit 3.
In the present embodiment, please refer to fig. 6, wherein the current collecting and processing circuit 6 includes a fast comparator N3A, a fourth resistor R26, a fifth resistor R25, and a sixth resistor R18;
the negative input end of the fast comparator N3A is connected with the voltage and current acquisition circuit 5; one end of the fourth resistor R26 is connected to a reference voltage VREF, one end of the fifth resistor R25 is grounded GND, and the other ends of the fourth resistor R26 and the fifth resistor R25 are both connected to the positive input end of the fast comparator N3A; the output end of the fast comparator N3A is respectively connected with the main control circuit 1 and the front end voltage output adjusting circuit 7; one end of the sixth resistor R18 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 for comparing the current IFB signal fed back by the voltage and current acquisition circuit 5 with an internally set reserved value, and outputting a corresponding level according to a comparison result, and the fast comparator N3A may adopt an SGM8745 comparator; the fourth resistor R26 and the fifth resistor R25 mainly play a role of voltage division; the sixth resistor R18 acts as a pull-up voltage.
In the current collection processing circuit 6, a negative input end of the fast comparator N3A is provided with a resistor R20, and a positive input end of the fast comparator N3A is provided with a resistor R22; the resistor R20 and the resistor R22 mainly serve as matching.
When the current acquisition processing circuit 6 works, the current IFB signal fed back by the voltage and current acquisition circuit 5 is compared with an internally set reserved value, and if the current IFB signal is greater than the internally set reserved value, a high-level pulse is output; if the current IFB signal is less than or equal to the preset value, outputting a low-level pulse; meanwhile, the level pulse is also output to the main control circuit 1 and the front-end voltage output adjusting circuit 7.
The invention also provides a processing method of the convex wave of the output voltage of the constant current source, which needs to use the processing circuit 100, and the processing method comprises the following steps:
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 3; meanwhile, PWMA and PWMB signals with certain duty ratio are output to the BACK circuit 2 of the front-end switching power supply through the main control circuit 1; of course, the adjustment of the output voltage VPP of the front-end switching power supply BACK circuit 2 can also be realized by adjusting the duty ratios of the PWMA signal and the PWMB signal output by the main control circuit 1;
after receiving the PWMA and PWMB signals, the front-end switching power supply BACK circuit 2 enables to drive the first MOS transistor Q4 and the second MOS transistor Q5 in the front-end switching power supply BACK circuit 2 to be conducted, so as to output a voltage VPP signal to the front-end voltage output adjusting circuit 7; after receiving the voltage VPP signal, the front-end voltage output adjusting circuit 7 enables and drives a fourth MOS transistor Q2 in the front-end voltage output adjusting circuit 7 to be turned on, so as to output a voltage VCC signal to the linear regulation control circuit 4;
the constant voltage and constant current control circuit 3 receives VsetAnd IsetAfter the signal is sent, enabling the voltage operational amplifier N1A and the current operational amplifier N1B of the constant-voltage constant-current control circuit 3 to output a high level to drive the fifth MOS transistor Q1 in the linear regulation control circuit 4 to be conducted, so as to output a voltage current value;
the voltage and current acquisition circuit 5 acquires voltage VFB and current IFB in a loop; the voltage and current acquisition circuit 5 feeds back acquired current signals of voltage VFB and IFB to the constant-voltage constant-current control circuit 3 in real time so that the constant-voltage constant-current control circuit 3 adjusts the conduction degree of a fifth MOS (metal oxide semiconductor) tube in the linear regulation control circuit 4, and the linear regulation control circuit 4 stably outputs a required voltage and current value, wherein the voltage value is recorded as V +; the voltage and current acquisition circuit 5 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 5 feeds back the acquired current IFB signal to the current acquisition processing circuit 6 in real time; the current acquisition processing circuit 6 compares the received current IFB signal with an internally set reserved value, and enables the fast comparator N3A of the current acquisition processing circuit 6 to output a low level pulse; when no convex wave appears, the current IFB signal received by the current collecting and processing circuit 6 is less than or equal to the preset value, and at this time, the fast comparator N3A outputs a low-level pulse by default;
when the external circuit is disconnected and the current is cut off to enable the linear regulation control circuit 4 to be out of control, namely when the external circuit is disconnected and the current is cut off instantly, the linear regulation control circuit 4 is out of control, and the linear regulation control circuit 4 directly outputs the voltage VCC in the front-end voltage output regulation circuit 7, so that the output voltage forms a convex wave; because the voltage VCC output by the front-end voltage output adjusting circuit 7 is larger than V +, the output voltage V + is pulled up instantly, and a convex wave is formed at the moment;
after the voltage and current acquisition circuit 5 acquires the change of the voltage VFB and the current IFB in the loop, the change of the voltage VFB and the current IFB signals is fed BACK to the main control circuit 1, the main control circuit 1 enables the first MOS transistor Q4 and the second MOS transistor Q5 in the front-end switch power supply BACK circuit 2 to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit 4 is indirectly turned off, and the process cannot completely eliminate the output voltage bulge wave because the time is too slow;
meanwhile, the voltage and current acquisition circuit 5 feeds back the change of the current IFB signal to the current acquisition processing circuit 6, and the current acquisition processing circuit 6 compares the received current IFB signal, and then enables the fast comparator N3A of the current acquisition processing circuit 6 to output a high-level pulse to the front-end voltage output adjustment circuit 7 (when a voltage bump occurs, the current IFB signal received by the current acquisition processing circuit 6 is greater than an internally set reserved value, and at this time, the fast comparator N3A outputs a high-level pulse), and enables the third MOS transistor Q3 in the front-end voltage output adjustment circuit 7 to be turned on and the fourth MOS transistor Q2 to be turned off through the high-level pulse, so that the voltage VPP input to the front-end voltage output adjustment circuit 7 is divided by the first resistor R1 and the second resistor R6, and then outputs a voltage VCC; after the voltage VPP is divided by the first resistor R1 and the second resistor R6, the output of the voltage VCC is greatly reduced, so that the voltage VCC is smaller than V +.
In conclusion, the invention compares the acquired current value in real time through the current acquisition processing circuit, and outputs high-level pulse when voltage bump occurs, so that the front-end voltage output adjusting circuit can quickly adjust the output voltage VCC; meanwhile, a first MOS tube and a second MOS tube in the BACK circuit of the front-end switching power supply are enabled to be driven to be switched off through the main control circuit, so that the voltage and current value output of the linear regulation control circuit is indirectly switched off; through the combined action of the two components, the problems that the current is instantly cut off due to the disconnection of an output loop, so that the instant runaway of the whole circuit causes the output voltage convex wave and damages related devices can be effectively solved.
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 (9)

1. A processing circuit of constant current source output voltage convex wave is characterized in that: the device comprises a main control circuit, a front-end switch power supply BACK circuit, a constant voltage and constant current control circuit, a linear regulation control circuit, a voltage and current acquisition circuit, a current acquisition processing circuit and a front-end voltage output adjusting circuit;
the main control circuit is connected with the front-end switching power supply BACK circuit, and the front-end switching power supply BACK circuit is connected with the front-end voltage output adjusting circuit; the constant voltage and constant current control circuit is connected with the main control circuit; the linear regulation control circuit is connected with the constant voltage and constant current control circuit; the voltage and current acquisition circuit is respectively connected with the main control circuit, the constant voltage and constant current control circuit and the current acquisition processing circuit; the current acquisition processing circuit is respectively connected with the main control circuit and the front end voltage output adjusting circuit; the front end voltage output adjusting circuit is connected with the linear regulation control circuit;
when an overcurrent protection test is carried out, a test load is respectively connected with the linear regulation control circuit and the voltage and current acquisition circuit;
when the constant-voltage constant-current control circuit works, the main control circuit controls the power supply output of the BACK circuit of the front-end switching power supply and controls the driving level output of the constant-voltage constant-current control circuit; the current acquisition processing circuit and the front end voltage output adjusting circuit control the front end voltage to be output; the front end voltage output adjusting circuit and the constant voltage and constant current control circuit control the linear adjustment output of the linear adjustment control circuit together; the voltage and current acquisition circuit acquires the voltage and current values on the loop in real time; the voltage and current acquisition circuit provides acquired voltage and current values for the main control circuit to perform real-time monitoring processing, the voltage and current acquisition circuit provides the acquired voltage and current values for the constant voltage and constant current control circuit to perform real-time feedback regulation and output high level drive to the main control circuit, and the voltage and current acquisition circuit provides the acquired current values for the current acquisition processing circuit to perform real-time comparison processing; the current acquisition processing circuit provides the output level to the main control circuit for real-time monitoring processing.
2. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: the BACK circuit of the front-end switching power supply comprises a driver, an isolation driving inductor, a first MOS (metal oxide semiconductor) tube, a second MOS tube and an energy storage inductor;
the input end of the driver is connected with the main control circuit, and the input end of the isolation driving inductor is connected with the output end of the driver; the isolation driving inductor is provided with two paths of outputs, wherein one path of output is respectively connected with the G pole and the S pole of the first MOS tube, the D pole of the first MOS tube is connected with a power supply, the other path of output is respectively connected with the G pole and the S pole of the second MOS tube, and the S pole of the second MOS tube is grounded; and the S pole of the first MOS tube and the D pole of the second MOS tube are both connected with the input end of the energy storage inductor, and the output end of the energy storage inductor is connected with the front end voltage output adjusting circuit.
3. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: the front end voltage output adjusting circuit comprises a first capacitor, a third MOS tube, a fourth MOS tube, a first resistor and a second resistor;
one end of the first capacitor is connected with the current acquisition and processing circuit, and the other end of the first capacitor is connected with the G pole of the third MOS tube; the D pole of the third MOS tube is connected with the G pole of the fourth MOS tube; the BACK circuit of the front-end switching power supply is connected with the D pole of the fourth MOS tube, and the D pole of the fourth MOS tube is connected with the S pole of the fourth MOS tube through the first resistor; one end of the second resistor is connected with the S pole of the fourth MOS tube, and the other end of the second resistor is grounded with the S pole of the third MOS tube.
4. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: 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; 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.
5. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: the linear regulation control circuit comprises a fifth MOS tube and a third resistor;
the G pole of the fifth MOS tube is connected with the constant-voltage constant-current control circuit, and the D pole of the fifth MOS tube is connected with the front-end voltage output adjusting circuit; the S pole of the fifth MOS tube is connected with the positive voltage sampling end of the voltage and current acquisition circuit; one end of the third 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 third resistor is connected with the ground and the negative current sampling end of the voltage and current acquisition circuit respectively.
6. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: 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 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, the current acquisition processing circuit and the constant voltage and constant current control circuit.
7. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: the current acquisition processing circuit comprises a fast comparator, a fourth resistor, a fifth resistor and a sixth resistor;
the negative input end of the rapid comparator is connected with the voltage and current acquisition circuit; one end of the fourth resistor is connected with the reference voltage, one end of the fifth resistor is grounded, and the other ends of the fourth resistor and the fifth resistor are both connected with the positive input end of the fast comparator; the output end of the rapid comparator is respectively connected with the main control circuit and the front end voltage output adjusting circuit; one end of the sixth resistor is connected with the output end of the fast comparator, and the other end of the sixth resistor is connected with a pull-up power supply.
8. The processing circuit of claim 1, wherein the constant current source outputs a convex wave of voltage, and the processing circuit comprises: the main control circuit adopts a TMS320F28377S chip.
9. A processing method of a convex wave of output voltage of a constant current source is characterized in that: the method is to use a processing circuit according to any of claims 1-8, the processing method comprising:
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; meanwhile, PWMA and PWMB signals are output to the BACK circuit of the front-end switching power supply through the main control circuit;
after receiving the PWMA and PWMB signals, the BACK circuit of the front-end switching power supply enables to drive a first MOS tube and a second MOS tube in the BACK circuit of the front-end switching power supply to be conducted so as to output a voltage VPP signal to the front-end voltage output adjusting circuit; after the front-end voltage output adjusting circuit receives the voltage VPP signal, a fourth MOS tube in the front-end voltage output adjusting circuit is driven to be conducted so as to output a voltage VCC signal to the linear regulation control circuit;
the constant voltage and constant current control circuit receives VsetAnd IsetAfter the signal is sent, enabling a voltage operational amplifier and a current operational amplifier of the constant-voltage constant-current control circuit to output high levels so as to drive a fifth MOS tube in the linear regulation control circuit to be conducted, and 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 fifth MOS 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 acquired current IFB signals to the current acquisition processing circuit in real time; the current acquisition processing circuit compares the received current IFB signal with an internally set reserved value and enables a fast comparator of the current acquisition processing circuit to output a low-level pulse;
when the external loop is disconnected and the current is switched off, so that the linear regulation control circuit is out of control, the linear regulation control circuit directly outputs the voltage VCC in the front-end voltage output regulation circuit, and the output voltage forms a convex wave;
after the voltage and current acquisition circuit acquires the change of the voltage VFB and the current IFB in the loop, the change of the voltage VFB and the current IFB signals is fed BACK to the main control circuit, and the main control circuit enables the first MOS tube and the second MOS tube in the BACK circuit of the front-end switching power supply to be driven to be turned off, so that the voltage and current value output of the linear regulation control circuit is indirectly turned off; meanwhile, the voltage and current acquisition circuit feeds back the change of the current IFB signal to the current acquisition processing circuit, the current acquisition processing circuit compares the received current IFB signal, enables a fast comparator of the current acquisition processing circuit to output a high level pulse to the front end voltage output adjusting circuit, enables a third MOS tube in the front end voltage output adjusting circuit to be switched on and a fourth MOS tube to be switched off through the high level pulse, and enables the voltage VPP input to the front end voltage output adjusting circuit to be divided by the first resistor and the second resistor and then output the voltage VCC.
CN202010258146.1A 2020-04-03 2020-04-03 Processing circuit and processing method for constant current source output voltage convex wave Pending CN111458542A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114114112A (en) * 2020-09-01 2022-03-01 西门子(深圳)磁共振有限公司 Input voltage regulating circuit and method of coil and magnetic resonance imaging system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114114112A (en) * 2020-09-01 2022-03-01 西门子(深圳)磁共振有限公司 Input voltage regulating circuit and method of coil and magnetic resonance imaging system
CN114114112B (en) * 2020-09-01 2023-08-29 西门子(深圳)磁共振有限公司 Coil input voltage regulating circuit, method and magnetic resonance imaging system

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