CN110687955A - Constant voltage and constant current control output power circuit - Google Patents
Constant voltage and constant current control output power circuit Download PDFInfo
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- CN110687955A CN110687955A CN201911153376.5A CN201911153376A CN110687955A CN 110687955 A CN110687955 A CN 110687955A CN 201911153376 A CN201911153376 A CN 201911153376A CN 110687955 A CN110687955 A CN 110687955A
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- 230000010354 integration Effects 0.000 claims description 4
- 238000007600 charging Methods 0.000 description 9
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
Abstract
The invention provides a constant-voltage constant-current control output power supply circuit which comprises an MCU circuit and a DC/DC conversion power supply circuit, wherein the DC/DC conversion power supply circuit comprises a DC/DC power supply chip, the MCU circuit comprises a single chip microcomputer, a power supply input end and a power supply output end of the DC/DC power supply chip are respectively connected with an input power supply end and an output power supply end, an enabling end of the DC/DC power supply chip is connected with the single chip microcomputer, a current sampling circuit is connected between the DC/DC power supply chip and the output power supply end, an output voltage control end of the DC/DC power supply chip is connected with a constant-voltage constant-current control circuit, an output end of the current sampling circuit is connected with the constant-voltage constant-current control circuit, and the constant-voltage. The invention has the advantages of small volume, perfect function, good flexibility, wide application range and the like.
Description
Technical Field
The invention belongs to the technical field of constant voltage and constant current output of a power supply, and particularly relates to a constant voltage and constant current control output power supply circuit.
Background
The existing lithium battery charging usually adopts trickle charging, constant current and constant voltage three-stage charging mode, and domestic and foreign countries all have a large amount of special integrated circuits to realize the charging control function. However, the lithium battery pack with special specification, for example, a multi-string high-voltage large-capacity battery pack needs high-voltage large-current charging, and it is very difficult to select a special control integrated circuit.
Disclosure of Invention
The present invention is directed to solve the above problems, and an object of the present invention is to provide a constant voltage and constant current control output power supply circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant-voltage constant-current control output power circuit comprises an MCU circuit and a DC/DC conversion power circuit, wherein the DC/DC conversion power circuit comprises a DC/DC power chip, the MCU circuit comprises a single chip microcomputer, a power input end and a power output end of the DC/DC power chip are respectively connected with an input power end and an output power end, an enabling end of the DC/DC power chip is connected with the single chip microcomputer, a current sampling circuit is connected between the DC/DC power chip and the output power end, an output voltage control end of the DC/DC power chip is connected with a constant-voltage constant-current control circuit, an output end of the current sampling circuit is connected with the constant-voltage constant-current control circuit, and the constant-voltage constant-current control circuit is connected with the single chip microcomputer.
In the constant-voltage constant-current control output power supply circuit, the current sampling circuit includes a sampling resistor connected in series between the DC/DC power supply chip and the output power supply terminal, a high-voltage end and a low-voltage end of the sampling resistor are respectively connected to an input positive end and an input negative end of the current amplifier, and an output end of the current amplifier is connected to the constant-voltage constant-current control circuit.
In the above constant voltage and constant current control output power supply circuit, the constant voltage and constant current control circuit includes an analog electronic switch, a current control output and a voltage control output of the analog electronic switch are respectively connected to the constant current circuit and the constant voltage circuit, and a current control input and a voltage control input of the analog electronic switch are respectively connected to a current control signal end and a voltage control signal end of the single chip microcomputer.
In the constant-voltage constant-current control output power supply circuit, the constant-current circuit includes a first double-integration circuit and a first operational amplifier, two ends of the first double-integration circuit are respectively connected to the positive input end of the first operational amplifier and the current control output of the analog electronic switch, the negative input end of the first operational amplifier is connected to the current amplifier, and the output end of the first operational amplifier is connected to the output voltage control end of the DC/DC power supply chip through an optical coupler;
the constant voltage circuit comprises a second integrating circuit and a second operational amplifier, the two ends of the second integrating circuit are respectively connected with the positive input end of the second operational amplifier and the voltage control output of the analog electronic switch, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier through a diode, and the negative input end of the second operational amplifier and the common end of the diode are connected with the output voltage control end of the DC/DC power supply chip.
In the constant-voltage constant-current control output power supply circuit, the first double-integration circuit is formed by connecting a twenty-sixth resistor, a third capacitor, a twenty-seventh resistor and a sixteenth capacitor, the input end of the first double-integration circuit is connected to the analog electronic switch, and the output end of the first double-integration circuit is connected to the first operational amplifier;
the second double integrating circuit is formed by connecting an eighteenth resistor, a first capacitor, a seventeenth resistor and a fifteenth capacitor, the input end of the second double integrating circuit is connected to the analog electronic switch, and the output end of the second double integrating circuit is connected to the second operational amplifier.
In the above constant voltage and constant current control output power supply circuit, the output power supply circuit further includes a VCC power supply circuit and a reference voltage source circuit connected to the VCC power supply circuit, and a reference voltage output terminal of the reference voltage source circuit is connected to a reference voltage terminal of the analog electronic switch.
In the constant-voltage constant-current control output power supply circuit, the reference voltage end and the output end of the current amplifier are respectively connected to the single chip microcomputer.
In the constant-voltage constant-current control output power supply circuit, a switching tube for preventing the reverse discharge of the output power supply end and a switch control circuit for switching the switching tube are connected between the output power supply end and the sampling resistor.
In the constant-voltage constant-current control output power supply circuit, the switch tube is an N-channel MOS tube, the switch control circuit is connected to the gate of the N-channel MOS tube, the switch control circuit includes a second triode, the collector of the second triode is connected to the gate of the N-channel MOS tube through a twenty-fifth resistor, the emitter of the second triode is connected to the ground terminal, the base of the second triode is connected in parallel with the emitter through an eighth resistor, the gate and the source of the N-channel MOS tube are connected in parallel through a third resistor, and the base of the second triode is connected to the single chip through a sixth resistor.
In the constant-voltage constant-current control output power supply circuit, the single chip microcomputer is connected to the enabling end through an enabling circuit, the enabling circuit comprises a third triode, a base of the third triode is connected to the single chip microcomputer through a fifth resistor, a collector is connected to the enabling end, an emitter is connected to a grounding end, and a seventh resistor is connected to the base and the emitter in parallel.
The invention has the advantages that: the device has the advantages of small volume, complete functions, good flexibility, wide application range and the like; detecting the voltage and current output by the power supply, adjusting the PWM signal and ensuring the stability of constant voltage output or constant current output; converting the PWM into analog voltage by adopting a double-integration circuit, and shaping the amplitude of the PWM through an analog electronic switch so as to improve the accuracy of the analog voltage; the output voltage of the power supply module is controlled together in a mode of connecting or connecting double operational amplifiers, so that seamless switching between a constant current output mode and a constant voltage output mode is realized.
Drawings
FIG. 1 is a block diagram showing the construction of a constant voltage and constant current control output power supply circuit according to the present invention;
FIG. 2 is a schematic diagram of a main circuit in the constant voltage and constant current control output power circuit of the present invention;
FIG. 3 is a schematic diagram of an MCU circuit in the constant voltage and constant current control output power circuit of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present embodiment discloses a constant voltage and constant current control output power circuit, which includes an MCU circuit and a DC/DC conversion power circuit, where the DC/DC conversion power circuit includes a DC/DC power chip a1, and is responsible for converting an input power into a required voltage and current. The MCU circuit comprises a single chip microcomputer U5, a power input end Vi + and a power output end Vo + of a DC/DC power chip A1 are respectively connected to an input power end Vin and an output power end Vo +, the Vi-end and the Vo-end of the DC/DC power chip A1 are both grounded, an enabling end CNT of the DC/DC power chip A1 is connected to the single chip microcomputer U5, and the single chip microcomputer U5 controls the DC/DC conversion power circuit to be turned on or turned off to output.
Further, as shown in fig. 2, the circuit further includes a VCC power supply circuit, the VCC power supply circuit includes a linear regulator integrated circuit U1, Vin of the linear regulator integrated circuit U1 is connected to an input power supply terminal Vin, GND is connected to ground, Vout is a VCC output terminal, and outputs 5V voltage for supplying power to the plurality of integrated circuits, and Vin and Vout are respectively connected to ground through a capacitor C8 and a capacitor C14.
Further, the single chip microcomputer U5 is connected to the enable terminal CNT through an enable circuit, and the enable circuit includes a third transistor Q3, a base of the third transistor Q3 is connected to the PB0 of the single chip microcomputer U5 through a fifth resistor R5, a collector is connected to the enable terminal CNT, an emitter is connected to the ground terminal, and a seventh resistor R7 is connected in parallel to the base and the emitter. When EN is high, the third transistor Q3 is turned on, pulling the enable terminal CNT low, and the DC/DC power chip a1 turns on the output.
Particularly, a current sampling circuit is connected between the DC/DC power chip a1 and the output power source terminal Vo +, a constant voltage and constant current control circuit is connected to an output voltage control terminal TRIM of the DC/DC power chip a1, the output voltage control terminal TRIM is an output voltage adjusting pin, and when the pin is suspended or 0.6V, the output voltage of the DC/DC power chip a1 is 0.6V; the TRIM pin voltage is adjusted downwards, the output voltage rises, and the output voltage of the DC/DC power supply chip A1 reaches the maximum value of 24V along with the adjustment of the TRIM pin voltage to zero. The output end of the current sampling circuit is connected to the feedback input end of the constant-voltage constant-current control circuit, so that the constant-voltage constant-current control circuit can adjust the voltage of the TRIM pin according to the magnitude of the sampling current to further adjust the output voltage of the DC/DC power supply chip A1. The control input end of the constant-voltage constant-current control circuit is connected to the single chip microcomputer U5, and the output voltage value and the constant-current output current value of the DC/DC power supply chip A1 are set through the single chip microcomputer U5.
Specifically, the current sampling circuit comprises a sampling resistor R1 connected in series between a DC/DC power supply chip A1 and an output power supply terminal Vo +, a high voltage end and a low voltage end of the sampling resistor R1 are respectively connected to an input positive end and an input negative end of a current amplifier U2, and the current amplifier U2 converts an output current signal into a voltage signal to the ground through voltage drop on a sampling resistor R1. The output end of the current amplifier U2 is used for outputting a current value signal Isen, the current value signal Isen is input to the constant-voltage constant-current control circuit, and the output current value signal Isen is input to the singlechip U5.
Furthermore, the VCC power supply circuit is also connected with a reference voltage source circuit, the reference voltage source circuit comprises a voltage regulator tube U9, a resistor R12, a resistor R36 and a resistor R37, one end of the resistor R12 is connected with the VCC output end of the VCC power supply circuit, the other end of the resistor R12 is connected with a pin 3 of the voltage regulator tube U9 and is used as a reference voltage Vref to be output, and the reference voltage provides a reference voltage source for the constant voltage and constant current control circuit and the single chip microcomputer U5. Two ends of the R36 are respectively connected with a Vref output end and a pin 1 of a voltage regulator tube U9, two ends of the R37 are respectively connected with a ground terminal and a pin 1 of a voltage regulator tube U9, and a pin 2 of the voltage regulator tube U9 is connected with the ground terminal.
Specifically, the constant voltage and constant current control circuit comprises an analog electronic switch U6 for switching a power supply constant voltage output mode or a power supply constant current output mode, a reference voltage Vref is output and connected to a reference voltage end of the analog electronic switch U6, the peak voltage of a PWM signal output from the singlechip U5 is VCC, the precision is poor, the peak voltage is changed into the peak voltage of the reference voltage Vref through the shaping of the analog electronic switch U6, and the precision is greatly improved.
Further, a current control output COM2 and a voltage control output COM1 of the analog electronic switch U6 are respectively connected to the constant current circuit and the constant voltage circuit, and a current control input IN2 and a voltage control input IN1 of the analog electronic switch U6 are respectively connected to a current control signal end PWM _ I and a voltage control signal end PWM _ U of the single chip microcomputer U5, that is, PA7 and PB4 of the single chip microcomputer.
The PWM current control signal and the PWM voltage control signal of the singlechip are converted into direct current voltage with extremely small ripples through the secondary integration circuit of the constant current circuit and the constant voltage circuit respectively, and the voltage amplitude is over against the duty ratio of PWM and is between 0 and reference voltage Vref.
Specifically, the constant current circuit comprises a first double-integration circuit and a first operational amplifier U4A, two ends of the first double-integration circuit are respectively connected to the positive input end of the first operational amplifier U4A and the current control output COM2 of the analog electronic switch U6, the negative input end of the first operational amplifier U4A is connected to the current amplifier U2, and the output end of the first operational amplifier U4A is connected to the output voltage control end TRIM of the DC/DC power supply chip a1 through an optical coupler U3;
the constant voltage circuit comprises a second integrating circuit and a second operational amplifier U4B, two ends of the second integrating circuit are respectively connected to the positive input end of the second operational amplifier U4B and the voltage control output COM1 of the analog electronic switch U6, the negative input end of the second operational amplifier U4B is connected to the output end of the second operational amplifier U4B through a diode D1, and the negative input end of the second operational amplifier U4B and the common end of the diode D1 are connected to the output voltage control end TRIM of the DC/DC power supply chip A1.
Further, a resistor R4 is connected in series between the constant voltage circuit and the constant current circuit and between the output voltage control terminal TRIM.
In a power supply constant current output mode, the first operational amplifier U4A and the optical coupler U3 are controlled, when the output current of the DC/DC power supply chip A1 becomes low, the pin 6 of the output end of the current amplifier U2 becomes low, the output of the first operational amplifier U4A becomes high, the conduction of the optical coupler U3 is increased, the voltage of the TRIM pin of the DC/DC power supply chip A1 becomes low, the output voltage is increased, and the output current is increased; conversely, the output of the current amplifier U2 becomes high, which causes the output of U4A to become low, and the voltage of the TRIM pin of the DC/DC power supply chip becomes high through the conversion of the optocoupler U3, which reduces the output voltage and the output current.
In the constant voltage power output mode, the second operational amplifier U4B is controlled to directly control the TRIM pin voltage of the DC/DC power chip through the isolation and voltage following of the second operational amplifier U4B according to the reference voltage Vref, so that the output voltage of the DC/DC power chip a1 is constant.
Specifically, the first double-integrating circuit is formed by connecting a twenty-sixth resistor R26, a third capacitor C3, a twenty-seventh resistor R27 and a sixteenth capacitor C16, and the input end of the first double-integrating circuit is connected to the analog electronic switch U6, and the output end of the first double-integrating circuit is connected to the first operational amplifier U4A; similarly, the second double integrating circuit is formed by connecting an eighteenth resistor R18, a first capacitor C1, a seventeenth resistor R17 and a fifteenth capacitor C15, and the input end of the second double integrating circuit is connected to the analog electronic switch U6, and the output end of the second double integrating circuit is connected to the second operational amplifier U4B.
Preferably, a switching tube Q1 for preventing the reverse discharge of the output power source terminal Vo + and a switching control circuit for switching the switching tube Q1 are connected between the output power source terminal Vo + and the sampling resistor R1. The power output end Vo + and SEN + of the DC/DC power chip A1 is connected to one side of the sampling resistor R1 far away from the switching tube Q1 after being short-circuited.
Specifically, the switching transistor Q1 is an N-channel MOS transistor, and when it is turned off, it can prevent reverse discharge when the output power source terminal Vo + is connected to the battery. The switch control circuit is connected with the grid electrode of the N-channel MOS tube, the drain electrode of the N-channel MOS tube is connected with the sampling resistor R1, and the source electrode of the N-channel MOS tube is connected with the output power supply end Vo +.
The switch control circuit comprises a second triode Q2, the collector of the second triode Q2 is connected to the grid of the N-channel MOS tube through a twenty-fifth resistor R25, the emitter of the second triode Q2 is connected to the ground terminal, an eighth resistor R8 is connected in parallel to the base of the second triode Q2 and the emitter, a third resistor R3 is connected in parallel to the grid and the source of the N-channel MOS tube, the base of the second triode Q2 is connected to the singlechip U5 through a sixth resistor R6, and the RE control signal is connected to the base of the second triode Q2 through a sixth resistor R6 and an eighth resistor R8 in a voltage dividing manner.
As shown in fig. 3, PA7 and PB4 of the single-chip microcomputer U5 are output as PWM functions, and the duty ratio is preset according to the required output voltage and current values. The output voltage current of the output power end Vo + is divided by a resistor R29 and then is connected to the analog input port of the single chip microcomputer U5, and the value of the output voltage current is read through internal A/D conversion. The purpose of closed-loop control can be achieved by fine-tuning the duty ratio of the output PWM through PID operation.
The Vref end of the singlechip U5 is connected to a reference voltage source circuit to be used as a reference voltage for A/D conversion.
RE and EN of the single chip microcomputer U5 are respectively used for controlling the switching-on of the switch control circuit and the enabling of the DC/DC power supply chip A1.
In the charging process of the battery, if the battery voltage is detected to be too low, the battery enters a trickle charge mode, and the constant current output value is reduced by adjusting the PWM-I so as to protect the battery. When the voltage of the battery rises to a set value, the output current is set to be a standard constant current value.
After the constant current mode is converted into the constant voltage mode, the output voltage of the DC/DC power supply chip A1 is increased by adjusting the PWM-U, the voltage drop loss caused by an output cable is compensated, and when the output current tends to 0, the compensation is gradually reduced to 0.
Preferably, the single chip microcomputer U5 can also increase soft start output, and in the power supply starting process, in order to prevent the surge current impact caused by too fast output voltage change from increasing the soft start output function, the slow change of the output voltage is realized through the gradual change of PWM to the set value.
In the embodiment, a double-integration circuit is adopted to convert PWM into analog voltage, and the amplitude of the PWM is shaped through an analog electronic switch so as to improve the accuracy of the analog voltage; the output voltage of the power supply module is controlled together in a mode of connecting or connecting double operational amplifiers, so that seamless switching between a constant-current output mode and a constant-voltage output mode is realized; a current amplifier is adopted to convert the output current signal of the high end into a voltage signal to the ground, so that the ground potential inconsistency caused by the fact that a detection resistor is connected in series with a ground wire is avoided; the closed-loop control of the power output is realized by adopting software PID regulation, the output stability and the accuracy are improved, and the debugging workload is reduced; controlling the on and off of the DC/DC conversion power supply circuit through an EN signal; the on and off of a switching tube Q1 at the output end of the power supply are controlled by RE signals, so that the current backflow is avoided; respectively controlling the output constant voltage value and the constant current value of the power supply by outputting a PWM signal with adjustable duty ratio; the voltage and the current output by the DC/DC conversion power supply circuit are detected, the PWM signal is regulated, the constant voltage output or the constant current output is stable, and the output can be closed when the open loop of a power supply control loop is out of control; in the starting process of the power supply, the output voltage is slowly changed by gradually changing the PWM to a set value; in the charging process of the battery, the battery voltage can be detected, and the charging mode can be automatically switched to trickle charging, constant-current charging and constant-voltage charging according to the battery voltage; in the constant voltage mode, the output voltage of the power supply is properly increased by detecting the output voltage, the voltage drop loss caused by an output cable is compensated, and when the output current tends to 0, the compensation is gradually reduced to 0; in the constant current mode, the TRIM pin voltage is regulated according to the output current, so that constant current output is maintained.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made or substituted in a similar manner to the specific embodiments described herein by those skilled in the art without departing from the spirit or exceeding the scope of the invention as defined in the appended claims, the invention being expressed as directly or indirectly connected.
Although the DC/DC power chip a1 is used more herein; a singlechip U5; inputting a power end Vin; an output power source Vo +; a sampling resistor R1; a current amplifier U2; a current control output COM 2; a voltage control output COM 1; a current control input IN 2; a voltage control input IN 1; a current control signal end PWM _ I; a voltage control signal end PWM _ U; a first operational amplifier U4A; an optocoupler U3; a second operational amplifier U4B; a diode D1; a switching tube Q1; a second transistor Q2; an enable terminal CNT; third transistor Q3, etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A constant voltage and constant current control output power circuit comprises an MCU circuit and a DC/DC conversion power circuit, wherein the DC/DC conversion power circuit comprises a DC/DC power chip, the MCU circuit comprises a single chip microcomputer, a power input end and a power output end of the DC/DC power chip are respectively connected with an input power end and an output power end, and an enabling end of the DC/DC power chip is connected with the single chip microcomputer.
2. The constant-voltage constant-current control output power supply circuit according to claim 1, wherein the current sampling circuit comprises a sampling resistor connected in series between the DC/DC power supply chip and an output power supply terminal, a high-voltage terminal and a low-voltage terminal of the sampling resistor are respectively connected to an input positive terminal and an input negative terminal of a current amplifier, and an output terminal of the current amplifier is connected to the constant-voltage constant-current control circuit.
3. The constant voltage and constant current control output power supply circuit according to claim 2, wherein the constant voltage and constant current control circuit comprises an analog electronic switch, a current control output and a voltage control output of the analog electronic switch are respectively connected to the constant current circuit and the constant voltage circuit, and a current control input and a voltage control input of the analog electronic switch are respectively connected to a current control signal terminal and a voltage control signal terminal of the single chip microcomputer.
4. The constant voltage and constant current control output power supply circuit according to claim 3, wherein the constant current circuit comprises a first double integrating circuit and a first operational amplifier, two ends of the first double integrating circuit are respectively connected to a positive input end of the first operational amplifier and a current control output of an analog electronic switch, a negative input end of the first operational amplifier is connected to the current amplifier, and an output end of the first operational amplifier is connected to an output voltage control end of the DC/DC power supply chip through an optical coupler;
the constant voltage circuit comprises a second integrating circuit and a second operational amplifier, the two ends of the second integrating circuit are respectively connected with the positive input end of the second operational amplifier and the voltage control output of the analog electronic switch, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier through a diode, and the negative input end of the second operational amplifier and the common end of the diode are connected with the output voltage control end of the DC/DC power supply chip.
5. The constant voltage and constant current control output power supply circuit according to claim 4, wherein the first double integration circuit is formed by connecting a twenty-sixth resistor, a third capacitor, a twenty-seventh resistor and a sixteenth capacitor, an input end of the first double integration circuit is connected to the analog electronic switch, and an output end of the first double integration circuit is connected to the first operational amplifier;
the second double integrating circuit is formed by connecting an eighteenth resistor, a first capacitor, a seventeenth resistor and a fifteenth capacitor, the input end of the second double integrating circuit is connected to the analog electronic switch, and the output end of the second double integrating circuit is connected to the second operational amplifier.
6. The constant voltage and constant current control output power supply circuit according to claim 5, further comprising a VCC power supply circuit and a reference voltage source circuit connected to the VCC power supply circuit, wherein a reference voltage output terminal of the reference voltage source circuit is connected to a reference voltage terminal of the analog electronic switch.
7. The constant voltage and constant current control output power supply circuit according to claim 6, wherein the reference voltage terminal and the output terminal of the current amplifier are connected to the single chip microcomputer, respectively.
8. The constant-voltage constant-current control output power supply circuit according to any one of claims 1 to 7, wherein a switching tube for preventing reverse discharge of the output power supply terminal and a switching control circuit for switching the switching tube are connected between the output power supply terminal and the sampling resistor.
9. The constant-voltage constant-current control output power supply circuit according to claim 8, wherein the switching tube is an N-channel MOS tube, the switching control circuit is connected to a gate of the N-channel MOS tube, and the switching control circuit includes a second triode, a collector of the second triode is connected to the gate of the N-channel MOS tube through a twenty-fifth resistor, an emitter of the second triode is connected to a ground terminal, an eighth resistor is connected in parallel between a base and the emitter of the second triode, a third resistor is connected in parallel between the gate and the source of the N-channel MOS tube, and a base of the second triode is connected to the single chip microcomputer through a sixth resistor.
10. The constant-voltage constant-current control output power supply circuit as claimed in any one of claims 1 to 7, wherein the single chip microcomputer is connected to the enable terminal through an enable circuit, the enable circuit includes a third triode, a base of the third triode is connected to the single chip microcomputer through a fifth resistor, a collector is connected to the enable terminal, an emitter is connected to a ground terminal, and a seventh resistor is connected in parallel to the base and the emitter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112445259A (en) * | 2020-11-17 | 2021-03-05 | 长春捷翼汽车零部件有限公司 | Power supply voltage stabilization output adjusting device, method and system |
| CN112821734A (en) * | 2021-01-29 | 2021-05-18 | 浙江嘉科电子有限公司 | Intelligent power supply conversion control system |
| CN113394995A (en) * | 2021-06-03 | 2021-09-14 | 英麦科（厦门）微电子科技有限公司 | Constant voltage and constant current control circuit and quick charging circuit |
| CN116360540A (en) * | 2023-05-19 | 2023-06-30 | 四川奥库科技有限公司 | Voltage regulating system and voltage regulating method for chip test |
| CN116430159A (en) * | 2023-06-14 | 2023-07-14 | 江西斐耳科技有限公司 | Multifunctional test system |
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| CN112445259A (en) * | 2020-11-17 | 2021-03-05 | 长春捷翼汽车零部件有限公司 | Power supply voltage stabilization output adjusting device, method and system |
| CN112821734A (en) * | 2021-01-29 | 2021-05-18 | 浙江嘉科电子有限公司 | Intelligent power supply conversion control system |
| CN113394995A (en) * | 2021-06-03 | 2021-09-14 | 英麦科（厦门）微电子科技有限公司 | Constant voltage and constant current control circuit and quick charging circuit |
| CN113394995B (en) * | 2021-06-03 | 2024-05-07 | 拓尔微电子股份有限公司 | Constant voltage constant current control circuit and quick charging circuit |
| CN116360540A (en) * | 2023-05-19 | 2023-06-30 | 四川奥库科技有限公司 | Voltage regulating system and voltage regulating method for chip test |
| CN116360540B (en) * | 2023-05-19 | 2023-09-29 | 四川奥库科技有限公司 | Voltage regulating system and voltage regulating method for chip test |
| CN116430159A (en) * | 2023-06-14 | 2023-07-14 | 江西斐耳科技有限公司 | Multifunctional test system |
| CN116430159B (en) * | 2023-06-14 | 2023-09-26 | 江西斐耳科技有限公司 | Multifunctional test system |
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