CN112332660A - Power supply parallel output control circuit and control method thereof - Google Patents

Power supply parallel output control circuit and control method thereof Download PDF

Info

Publication number
CN112332660A
CN112332660A CN202011138239.7A CN202011138239A CN112332660A CN 112332660 A CN112332660 A CN 112332660A CN 202011138239 A CN202011138239 A CN 202011138239A CN 112332660 A CN112332660 A CN 112332660A
Authority
CN
China
Prior art keywords
voltage
control circuit
power supply
output control
parallel output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202011138239.7A
Other languages
Chinese (zh)
Inventor
王鸿雁
陶军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Xiyuan Electric Co ltd
Original Assignee
Shanghai Xiyuan Electric Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Xiyuan Electric Co ltd filed Critical Shanghai Xiyuan Electric Co ltd
Priority to CN202011138239.7A priority Critical patent/CN112332660A/en
Publication of CN112332660A publication Critical patent/CN112332660A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output

Abstract

The invention provides a power supply parallel output control circuit, which comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a capacitor and a metal-oxide semiconductor field effect transistor, wherein the first resistor, the second resistor, the third resistor and the capacitor form an impedance network of the power supply parallel output control circuit, the power supply parallel output control circuit is subjected to filtering and feedback loop compensation, and the operational amplifier adjusts the metal-oxide semiconductor field effect transistor in real time, so that the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit is constant equal to a set reference voltage in value.

Description

Power supply parallel output control circuit and control method thereof
Technical Field
The invention relates to the field of control circuits, in particular to a power supply parallel output control circuit and a control method thereof.
Background
When the power supplies are used in parallel, in order to prevent output current from flowing backwards into the power supplies, the output of each power supply is usually connected with a diode in series, but in a large-current power supply system, because the conduction voltage drop of the diodes is large, a large amount of loss is generated, so that the loss is reduced by adopting the MOSFET instead of the diodes.
In the prior art, hysteresis control is adopted, and when a load is light, the MOSFET can be frequently switched between on and off, so that the output oscillation output ripple voltage is increased.
Disclosure of Invention
The invention aims to provide a power supply parallel output control circuit and a control method thereof, which adopt feedback control to adjust the gate voltage of an MOSFET (metal-oxide-semiconductor field effect transistor), so that the voltage at two working ends of the MOSFET is stabilized at a set value, and the problem that the output oscillation output ripple voltage is large when the load is light can be solved.
In order to achieve at least one of the above objectives, the present invention provides a power supply parallel output control circuit, which includes an operational amplifier, a first resistor, a second resistor, a third resistor, a capacitor, and a metal-oxide semiconductor field effect transistor, where the first resistor, the second resistor, the third resistor, and the capacitor form an impedance network of the power supply parallel output control circuit, the power supply parallel output control circuit is subjected to filtering and feedback loop compensation, and the operational amplifier adjusts the metal-oxide semiconductor field effect transistor in real time, so that a voltage difference between an input voltage and an output voltage of the power supply parallel output control circuit is constant in value and equal to a set reference voltage.
In some embodiments, wherein when the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is smaller in value than the set reference voltage, the output voltage of the operational amplifier decreases until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
In some embodiments, when the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit is smaller than the set reference voltage in value, the operational amplifier controls the metal-oxide semiconductor field effect transistor to tend to turn off until the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit is constant equal to the set reference voltage in value.
In some embodiments, wherein when the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is greater in value than the set reference voltage, the output voltage of the operational amplifier increases until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
In some embodiments, when the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit is greater than the set reference voltage in value, the operational amplifier controls the metal-oxide semiconductor field effect transistor to turn on until the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit is constant equal to the set reference voltage in value.
In some embodiments, the power supply parallel output control circuit uses feedback control to adjust the gate voltage of the mosfet such that the voltage across the mosfet is stabilized at a set value.
In some embodiments, the power supply parallel output control circuit further comprises a real-time monitoring circuit module, and the real-time monitoring circuit module feeds back the voltage difference between the input voltage and the output voltage of the power supply parallel output control circuit in real time.
In some embodiments, when the voltage difference between the input voltage and the output voltage is different from the set reference voltage, the real-time monitoring circuit module alarms and feeds back, so that whether the operational amplifier can regulate the driving voltage of the metal-oxide semiconductor field effect transistor in real time under a normal working state can be monitored.
According to another aspect of the present invention, there is also provided a control method of a parallel output control circuit of a power supply, including the steps of:
presetting a set reference voltage value of a power supply parallel output control circuit;
when the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is larger than the set reference voltage value in value, the output voltage of the operational amplifier is increased, so that the metal-oxide semiconductor field effect transistor tends to be turned on, and the output voltage of the power supply parallel output control circuit is increased until the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is constant on value and is equal to the set reference voltage value;
and
when the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is smaller than the set reference voltage value in value, the output voltage of the operational amplifier is reduced, so that the metal-oxide semiconductor field effect transistor tends to be turned off, and the output voltage of the power supply parallel output control circuit is reduced until the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value and is equal to the set reference voltage value.
In some embodiments, the method further comprises the following steps: and monitoring and feeding back the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit in real time, and alarming and feeding back when the voltage difference value is different from a set reference voltage value, so that whether the operational amplifier can regulate the driving voltage of the metal-oxide semiconductor field effect transistor in real time under a normal working state can be monitored.
Drawings
Fig. 1 is a schematic perspective view of a power parallel output control circuit according to a preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Fig. 1 shows a parallel output control circuit for power supplies according to a preferred embodiment of the present invention. The power supply parallel output control circuit adopts feedback control to adjust the gate voltage of the MOSFET, so that the voltages at two working ends of the MOSFET are stabilized at set values, and the problem of increasing of output oscillation output ripple voltage when the load is light can be solved.
Specifically, as shown in fig. 1, in this preferred embodiment of the present invention, Vref is a set reference voltage; OP1 is an operational amplifier; vin is the input voltage; vout is the output voltage; the Z1, Z2 and Z3 resistors and capacitors form an impedance network for filtering and feedback loop compensation to prevent oscillation of the output of the operational amplifier OP 1.
In a specific embodiment, when Vin-Vout > Vref is a value, that is, when a voltage difference between an input voltage and an output voltage of the power parallel output control circuit is greater than a set reference voltage, an output voltage of the operational amplifier OP1 is increased, such that the mosfet q1 tends to turn on, and Vout voltage is increased, such that Vin-Vout becomes Vref, that is, such that a voltage difference between the input voltage and the output voltage of the power parallel output control circuit is equal to the set reference voltage in value.
In a specific embodiment, when Vin-Vout < Vref is numerically, that is, when the voltage difference between the input voltage and the output voltage of the power parallel output control circuit is numerically smaller than the set reference voltage, the output voltage of the operational amplifier OP1 is decreased, so that the MOSFET Q1 tends to turn off, and the Vout voltage is decreased, so that Vin-Vout becomes Vref, that is, so that the voltage difference between the input voltage and the output voltage of the power parallel output control circuit is numerically equal to the set reference voltage.
In a specific embodiment, the operational amplifier OP1 can adjust the driving voltage of the mosfet q1 in real time, so that Vin-Vout is always equal to Vref, i.e., Vout is constantly equal to Vin-Vref, and there is no oscillation ripple for stable output. That is to say, the operational amplifier OP1 adjusts the driving voltage of the MOSFET Q1 in real time, so that the voltage difference between the input voltage and the output voltage of the power parallel output control circuit is constant in value and equal to the set reference voltage, and the problem that the output oscillation output ripple voltage becomes large when the load is light can be solved.
It should be noted that the power supply parallel output control circuit of the present invention further includes a real-time monitoring circuit module, wherein the real-time monitoring circuit module feeds back a voltage difference between an input voltage and an output voltage of the power supply parallel output control circuit in real time, and when the voltage difference is different from a set reference voltage, an alarm is given back, so as to monitor whether the operational amplifier OP1 can adjust the driving voltage of the MOSFET Q1 in real time under a normal working state.
According to another aspect of the present invention, there is also provided a control method of a parallel output control circuit of a power supply, including the steps of:
presetting a set reference voltage value of a power supply parallel output control circuit;
when the voltage difference value between the input voltage and the output voltage of the power supply parallel output control circuit is greater than the set reference voltage value in value, the output voltage of the operational amplifier OP1 is increased, so that the MOSFET Q1 tends to be turned on, and the output voltage of the power supply parallel output control circuit is increased until the voltage difference value between the input voltage and the output voltage of the power supply parallel output control circuit is constant equal to the set reference voltage value in value; and
when the voltage difference between the input voltage and the output voltage of the power parallel output control circuit is smaller than the set reference voltage value in value, the output voltage of the operational amplifier OP1 decreases, so that the MOSFET Q1 tends to turn off, and the output voltage of the power parallel output control circuit decreases until the voltage difference between the input voltage and the output voltage of the power parallel output control circuit is constant equal to the set reference voltage value in value.
It is worth mentioning that the control method of the power supply parallel output control circuit further comprises the steps of: the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is monitored and fed back in real time, and when the voltage difference value is different from a set reference voltage value, alarm feedback is carried out, so that whether the operational amplifier OP1 can regulate the driving voltage of the MOSFET Q1 in real time under a normal working state can be monitored.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (10)

1. The utility model provides a power parallel output control circuit, its characterized in that includes operational amplifier, first resistance, second resistance, third resistance, electric capacity and metal-oxide semiconductor field effect transistor, first resistance, the second resistance, the third resistance and the electric capacity form the impedance network of power parallel output control circuit, to power parallel output control circuit carries out filtering and feedback loop compensation, operational amplifier adjusts in real time metal-oxide semiconductor field effect transistor, thereby the voltage difference of the input voltage of power parallel output control circuit and output voltage invariably equals to setting for reference voltage in the numerical value.
2. The power supply parallel output control circuit as claimed in claim 1, wherein when a voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is smaller in value than a set reference voltage, the output voltage of the operational amplifier is decreased until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
3. The power supply parallel output control circuit as claimed in claim 2, wherein when the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is smaller in value than the set reference voltage, the operational amplifier controls the mosfet to go off until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
4. The power supply parallel output control circuit as claimed in claim 1, wherein when a voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is greater in value than a set reference voltage, the output voltage of the operational amplifier rises until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
5. The power supply parallel output control circuit as claimed in claim 4, wherein when the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is greater in value than the set reference voltage, the operational amplifier controls the metal-oxide semiconductor field effect transistor to turn on until the voltage difference of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value equal to the set reference voltage.
6. The power supply parallel output control circuit as claimed in claim 1, wherein the power supply parallel output control circuit employs feedback control to adjust the gate voltage of the mosfet such that the voltage across the mosfet is stabilized at a set value.
7. The power supply parallel output control circuit according to any one of claims 1 to 6, wherein the power supply parallel output control circuit further comprises a real-time monitoring circuit module which feeds back a voltage difference between an input voltage and an output voltage of the power supply parallel output control circuit in real time.
8. The power supply parallel output control circuit as claimed in claim 7, wherein when the voltage difference between the input voltage and the output voltage is different from the set reference voltage, the real-time monitoring circuit module alarms and feeds back, so as to monitor whether the operational amplifier can adjust the driving voltage of the metal-oxide semiconductor field effect transistor in real time under a normal operating condition.
9. A control method of a power supply parallel output control circuit is characterized by comprising the following steps:
presetting a set reference voltage value of a power supply parallel output control circuit;
when the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is larger than the set reference voltage value in value, the output voltage of the operational amplifier is increased, so that the metal-oxide semiconductor field effect transistor tends to be turned on, and the output voltage of the power supply parallel output control circuit is increased until the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is constant on value and is equal to the set reference voltage value;
and
when the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is smaller than the set reference voltage value in value, the output voltage of the operational amplifier is reduced, so that the metal-oxide semiconductor field effect transistor tends to be turned off, and the output voltage of the power supply parallel output control circuit is reduced until the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit is constant in value and is equal to the set reference voltage value.
10. The control method of a power parallel output control circuit according to claim 9, further comprising the steps of: and monitoring and feeding back the voltage difference value of the input voltage and the output voltage of the power supply parallel output control circuit in real time, and alarming and feeding back when the voltage difference value is different from a set reference voltage value, so that whether the operational amplifier can regulate the driving voltage of the metal-oxide semiconductor field effect transistor in real time under a normal working state can be monitored.
CN202011138239.7A 2020-10-22 2020-10-22 Power supply parallel output control circuit and control method thereof Withdrawn CN112332660A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011138239.7A CN112332660A (en) 2020-10-22 2020-10-22 Power supply parallel output control circuit and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011138239.7A CN112332660A (en) 2020-10-22 2020-10-22 Power supply parallel output control circuit and control method thereof

Publications (1)

Publication Number Publication Date
CN112332660A true CN112332660A (en) 2021-02-05

Family

ID=74311233

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011138239.7A Withdrawn CN112332660A (en) 2020-10-22 2020-10-22 Power supply parallel output control circuit and control method thereof

Country Status (1)

Country Link
CN (1) CN112332660A (en)

Similar Documents

Publication Publication Date Title
EP0884746B1 (en) Synchronous switching regulator which employs switch voltage-drop for current sensing
DE69832346T2 (en) voltage regulators
US5982160A (en) DC-to-DC converter with inductor current sensing and related methods
DE112004002213T5 (en) Power converter with improved control
DE112011106125B3 (en) ADAPTIVE RESPONSE CIRCUIT TO CONTROL A SHIFT REGULATOR
EP2771748B1 (en) Power supply for industrial process field device
DE69929132T2 (en) Controller for a DC-DC converter
US6130526A (en) Voltage regulator with wide control bandwidth
DE102013102855A1 (en) Power converter with reduced power consumption in standby mode
US7550955B2 (en) Power supply circuit
DE102010054899A1 (en) Control circuit arrangement, circuit arrangement and method for controlling a current source coupled to a load
US9413240B2 (en) Power converter and controller device
US7352161B2 (en) Burst-mode switching voltage regulator with ESR compensation
EP1994460B1 (en) A power converter
CN112558677B (en) Low dropout regulator based on reverse current protection
WO2023001315A1 (en) Switching converter
US20050035746A1 (en) Voltage regulator with adjustable output impedance
CN204808075U (en) Semiconductor refrigerator&#39;s temperature -control circuit
CN112332660A (en) Power supply parallel output control circuit and control method thereof
US20220393593A1 (en) Control circuit of dc/dc converter, power supply circuit, and electronic device
US20110216461A1 (en) System and Method to Limit In-Rush Current
DE10164254A1 (en) Method and device for current regulation for programmable logic controllers
EP0550823B1 (en) Procedure for the limitation of the current across a servo component and equipment
CN212258785U (en) Voltage reduction circuit and electronic device
JPH07219652A (en) Power unit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20210205

WW01 Invention patent application withdrawn after publication