CN114204667A - Low-voltage power supply device and converter - Google Patents

Low-voltage power supply device and converter Download PDF

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Publication number
CN114204667A
CN114204667A CN202210065354.9A CN202210065354A CN114204667A CN 114204667 A CN114204667 A CN 114204667A CN 202210065354 A CN202210065354 A CN 202210065354A CN 114204667 A CN114204667 A CN 114204667A
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CN
China
Prior art keywords
resistor
power supply
module
capacitor
triode
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Pending
Application number
CN202210065354.9A
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Chinese (zh)
Inventor
陆斌
邹健男
周立成
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New United Rail Transit Technology Co Ltd
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New United Rail Transit Technology Co Ltd
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Priority to CN202210065354.9A priority Critical patent/CN114204667A/en
Publication of CN114204667A publication Critical patent/CN114204667A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/066—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems characterised by the use of dynamo-electric machines
    • 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
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/08—Arrangements for controlling the speed or torque of a single motor

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a low-voltage power supply device and a converter, wherein in the scheme, the output end of a first power supply is connected with the first end of an MOS (metal oxide semiconductor) tube, the output end of a second power supply is connected with the input end of a DC/DC converter, the output end of the DC/DC converter is connected with the input end of an isolation module, the output end of the isolation module is connected with the second end of the MOS tube, and the connected public end is connected with a load; the first control module is connected with the control end of the MOS tube and used for controlling the MOS tube to be conducted when the first power supply outputs voltage. The body diode in the MOS pipe isolates the influence of the second power supply on the first power supply, and the voltage drop when the MOS pipe is conducted is lower, so that the MOS pipe is more suitable for power supply occasions with higher requirements on voltage stability, the practicability and the universality are stronger, the power loss caused by the voltage drop when the MOS pipe is conducted is smaller, the power of a load is larger, and the power supply efficiency can be improved for the power supply of a large-power load.

Description

Low-voltage power supply device and converter
Technical Field
The invention relates to the technical field of low-voltage power supply, in particular to a low-voltage power supply device and a converter.
Background
In the prior art, a dual power supply is adopted to supply power for a load with lower voltage, wherein a low-voltage storage battery and a triode form a first power supply branch, another power supply forms a second power supply branch, the first power supply branch and the second power supply branch are connected in parallel and then connected with the load, the low-voltage storage battery supplies power for the load when the triode is conducted, and meanwhile, the influence of the other power supply is isolated through a diode in the triode. However, when the triode is conducted, the ratio of the voltage drop of the diode inside the triode to the low voltage output by the low-voltage storage battery is high, the triode is not suitable for power supply occasions with high requirements for voltage stability, the practicability and the universality are weaker, and meanwhile, when the triode is conducted, the power loss caused by the voltage drop of the diode inside the triode is high, so that the power of the load is low, the power supply for high-power loads is difficult, and the power supply efficiency is influenced.
Disclosure of Invention
The utility model aims at providing a device and converter of low-voltage power supply, in this scheme, the intraductal body diode of MOS has kept apart the influence of second power supply to first power, and the voltage drop when the MOS pipe switches on is lower, be more applicable to the higher power supply occasion of voltage stability requirement, practicality and commonality are stronger, the power loss that the voltage drop when the MOS pipe switches on brought is less simultaneously, make the power of load great, can supply power and improved power supply efficiency for powerful load.
In order to solve the technical problem, the application provides a low-voltage power supply device, which comprises an MOS (metal oxide semiconductor) tube, a first control module, an isolation module and a DC/DC converter;
the output end of the first power supply is connected with the first end of the MOS tube, the output end of the second power supply is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is connected with the input end of the isolation module, the output end of the isolation module is connected with the second end of the MOS tube, and the connected common end is connected with a load;
the first control module is connected with the control end of the MOS tube and used for controlling the MOS tube to be conducted when the first power supply outputs voltage.
Preferably, the MOS transistor is a first PMOS transistor, and the first control module includes a first resistor and a second resistor;
the drain electrode of the first PMOS tube is used as the first end of the MOS tube, the source electrode of the first PMOS tube is used as the second end of the MOS tube, and the grid electrode of the first PMOS tube is used as the control end of the MOS tube; one end of the first resistor is connected with a source electrode of the first PMOS tube, the other end of the first resistor is connected with one end of the second resistor, a public end of the second resistor is connected with a grid electrode of the first PMOS tube, and the other end of the second resistor is grounded.
Preferably, the circuit further comprises a first capacitor, a common mode choke coil, a second capacitor, a third capacitor and a fourth capacitor;
the positive output end of the first power supply is respectively connected with one end of the first capacitor and the first input end of the common mode choke coil, and the negative output end of the first power supply is respectively connected with the other end of the first capacitor and the second input end of the common mode choke coil; a first output end of the common mode choke coil is respectively connected with one end of the second capacitor and one end of the fourth capacitor, and a connected common end is connected with a first end of the MOS tube; the other end of the second capacitor is connected with the other end of the third capacitor, and the connected common end is grounded;
the common mode choke coil, the second capacitor and the third capacitor are used for filtering common mode interference;
the first capacitor and the fourth capacitor are used for filtering out series mode interference.
Preferably, the load comprises a second control module;
the device also comprises a first driving module, a second driving module, a power switch and a controllable switch module;
the input end of the first driving module is connected with the output end of the first power supply through the power switch, the control end of the power switch is connected with the third control module, and the first driving module is used for outputting a first signal for controlling the controllable switch module to be closed when the third control module controls the power switch to be closed;
the input end of the second driving module is connected with the second control module and used for outputting a second signal for controlling the controllable switch module to be closed after receiving the driving voltage output by the second control module after the second control module is powered on;
the first end of the controllable switch module is connected with the output end of the isolation module and the second end of the MOS tube respectively, the second end of the controllable switch module is connected with the load, and the control end of the controllable switch module is connected with the output end of the first driving module and the output end of the second driving module respectively and used for being closed when the first signal and/or the second signal is received, or else, the controllable switch module is disconnected.
Preferably, the third control module is further configured to control the power switch to be turned off after the second control module outputs the driving voltage after being powered on.
Preferably, the controllable switch module includes a third resistor, a fourth resistor, a fifth resistor, a first triode and a second PMOS transistor;
one end of the third resistor is connected with the source electrode of the second PMOS tube, the public end of the third resistor is used as the first end of the controllable switch module, and the drain electrode of the second PMOS tube is used as the second end of the controllable switch module; the other end of the third resistor is respectively connected with the grid electrode of the second PMOS tube and one end of the fourth resistor; a collector of the first triode is connected with the other end of the fourth resistor, a base of the first triode is connected with one end of the fifth resistor, a connected public end of the base of the first triode is used as a control end of the controllable switch module, and an emitter of the first triode is connected with the other end of the fifth resistor, and a connected public end of the emitter of the first triode is grounded;
the first triode is used for being closed when the first signal and/or the second signal are received, and is opened when the first signal and/or the second signal are not received;
the second PMOS tube is used for being closed when the first triode is closed and being opened when the first triode is opened.
Preferably, the first driving module comprises a sixth resistor and a seventh resistor; one end of the sixth resistor is used as the input end of the first driving module, the other end of the sixth resistor is connected with one end of the seventh resistor, the connected public end of the sixth resistor and one end of the seventh resistor is used as the output end of the first driving module, and the other end of the seventh resistor is grounded.
Preferably, the second driving module includes an eighth resistor, a ninth resistor, a second triode, an optocoupler, a tenth resistor, an eleventh resistor, a third power supply, and a fourth power supply;
one end of the eighth resistor is used as an input end of the second driving module, and the other end of the eighth resistor is connected with one end of the ninth resistor and the base of the second triode respectively; the other end of the ninth resistor is connected with the emitting electrode of the second triode, and the connected public end is grounded; the cathode of the optocoupler is connected with the collector of the second triode, the anode of the optocoupler is connected with one end of the tenth resistor, the collector of the optocoupler is connected with the third power supply, and the emitter of the optocoupler is connected with one end of the eleventh resistor; the other end of the eleventh resistor is used as an output end of the second driving module; the other end of the tenth resistor is connected with the fourth power supply;
the second triode is used for being closed after receiving the driving voltage output by the second control module after being electrified;
and the optocoupler is used for carrying out electrical isolation when the second triode is closed and outputting a second signal for controlling the controllable switch module to be closed.
Preferably, the load protection circuit further comprises a sixth capacitor, one end of the sixth capacitor is connected with the output end of the isolation module, the second end of the MOS transistor and the load, and the other end of the sixth capacitor is grounded.
In order to solve the technical problem, the present application further provides a converter including the above low-voltage power supply apparatus.
The utility model provides a low-voltage power supply device and a converter, wherein, the output end of a first power supply is connected with the first end of an MOS tube, the output end of a second power supply is connected with the input end of a DC/DC converter, the output end of the DC/DC converter is connected with the input end of an isolation module, the output end of the isolation module is connected with the second end of the MOS tube, and the connected public end is connected with a load; the first control module is connected with the control end of the MOS tube and used for controlling the MOS tube to be conducted when the first power supply outputs voltage. The body diode in the MOS pipe isolates the influence of the second power supply on the first power supply, and the voltage drop when the MOS pipe is conducted is lower, so that the MOS pipe is more suitable for power supply occasions with higher requirements on voltage stability, the practicability and the universality are stronger, the power loss caused by the voltage drop when the MOS pipe is conducted is smaller, the power of a load is larger, and the power supply efficiency can be improved for the power supply of a large-power load.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a device powered by low-voltage power provided by the present application;
FIG. 2 is a schematic diagram of another low voltage power powered device provided herein;
fig. 3 is a schematic structural diagram of a current transformer provided in the present application.
Detailed Description
The core of the application is to provide a device and converter of low-voltage power supply, in this scheme, the influence of second power supply to first power has been kept apart to the intraductal body diode of MOS (Metal-Oxide-Semiconductor), and the voltage drop when the MOS pipe switches on is lower, more be applicable to the power supply occasion that requires higher to the voltage stability, practicality and commonality are stronger, the power loss that the voltage drop when the MOS pipe switches on brought is less simultaneously, make the power of load great, can supply power and improved power supply efficiency for powerful load.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a low-voltage power supply device provided in the present application, where the low-voltage power supply device includes an MOS transistor 1, a first control module 2, an isolation module 3, and a DC/DC (Direct Current/Direct Current) converter 4;
the output end of the first power supply is connected with the first end of the MOS tube 1, the output end of the second power supply is connected with the input end of the DC/DC converter 4, the output end of the DC/DC converter 4 is connected with the input end of the isolation module 3, the output end of the isolation module 3 is connected with the second end of the MOS tube 1, and the connected common end is connected with a load;
the first control module 2 is connected with the control end of the MOS tube 1 and used for controlling the MOS tube 1 to be conducted when the first power supply outputs voltage.
MOS pipe 1's among the application conduction pressure drop is lower for the triode's among the prior art conduction pressure drop, consequently MOS pipe 1's conduction pressure drop is also lower for the proportion of the voltage of first power output, more be applicable to the higher power supply occasion of voltage stability requirement, practicality and commonality are stronger, the power loss that lower voltage drop brought simultaneously is less, make the power of load great, can just improve power supply efficiency for powerful load power supply.
Specifically, usually, the voltage of the first power supply is greater than the voltage of the second power supply output through the DC/DC converter 4, the isolation module 3 may be a diode, and intercept the output of the second power supply through the diode while isolating the influence of the first power supply on the second power supply, at this time, the first power supply supplies power to the load after the MOS transistor 1 is controlled by the first control module 2 to be turned on, and when the first power supply loses power, the load is supplied with power through the second power supply. Meanwhile, the second power supply may be a high voltage power supply, and the high voltage is converted into a low voltage less affected by the voltage drop of the diode through the DC/DC converter 4.
The second power source, the DC/DC converter 4 and the isolation module 3 may be connected in such a manner that an output positive terminal of the second power source is connected to an input positive terminal of the DC/DC converter 4, an output negative terminal of the second power source is connected to an input negative terminal of the DC/DC converter 4, an output positive terminal of the DC/DC converter 4 is connected to an input terminal of the isolation module 3, and an output negative terminal of the DC/DC converter 4 is grounded.
In addition, the first power source may be a low-voltage battery, the load may be an electric device such as a converter and a driving motor controller, and the low-voltage power supply device may be connected to a core control unit in the load, which is not particularly limited herein.
In summary, the present application provides a device for supplying power with low voltage power, in the scheme, an output end of a first power supply is connected to a first end of an MOS transistor 1, an output end of a second power supply is connected to an input end of a DC/DC converter 4, an output end of the DC/DC converter 4 is connected to an input end of an isolation module 3, an output end of the isolation module 3 is connected to a second end of the MOS transistor 1, and a common end of the connection is connected to a load; the first control module 2 is connected with the control end of the MOS tube 1 and used for controlling the MOS tube 1 to be conducted when the first power supply outputs voltage. The body diode in MOS pipe 1 has kept apart the influence of second power supply to first power to voltage drop when MOS pipe 1 switches on is lower, more is applicable to the higher power supply occasion of voltage stability requirement, and practicality and commonality are stronger, and the power loss that voltage drop brought when MOS pipe 1 switches on simultaneously is less, makes the power of load great, can just improve power supply efficiency for powerful load power supply.
On the basis of the above-described embodiment:
referring to fig. 2, fig. 2 is a schematic structural diagram of another low-voltage power supply apparatus provided in the present application.
As a preferred embodiment, the MOS transistor 1 is a first PMOS (P-channel Metal Oxide Semiconductor) transistor Q1, and the first control module 2 includes a first resistor R1 and a second resistor R2;
the drain electrode of the first PMOS transistor Q1 is used as the first end of the MOS transistor 1, the source electrode of the first PMOS transistor Q1 is used as the second end of the MOS transistor 1, and the gate electrode of the first PMOS transistor Q1 is used as the control end of the MOS transistor 1; one end of the first resistor R1 is connected with the source electrode of the first PMOS tube Q1, the other end of the first resistor R1 is connected with one end of the second resistor R2, the connected common end is connected with the grid electrode of the first PMOS tube Q1, and the other end of the second resistor R2 is grounded.
In this embodiment, the MOS transistor 1 is defined as a first PMOS transistor Q1, and at this time, the corresponding first control module 2 is composed of a first resistor R1 and a second resistor R2, specifically, a voltage output by the first power supply first passes through a body diode of the first PMOS transistor Q1 to reach the first resistor R1, the voltage drop of the body diode is large and the power consumption is high, then the voltage is divided by a first resistor R1 and a second resistor R2 and then grounded, a negative-phase conduction voltage is applied between a gate and a source of the first PMOS transistor Q1 by a voltage at two ends of the first resistor R1 to turn on the first PMOS transistor Q1, and at this time, the voltage of the first power supply is output through the turned-on first PMOS transistor Q1, and a smaller voltage drop is generated on the first PMOS transistor Q1.
In summary, the first PMOS transistor Q1 is controlled to be turned on by the first resistor R1 and the second resistor R2, so that the circuit has a simple structure, is easy and convenient to control, and has a low cost.
As a preferred embodiment, the device further includes a first capacitor C1, a common mode choke coil L, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4;
the positive output end of the first power supply is respectively connected with one end of a first capacitor C1 and the first input end of the common mode choke coil L, and the negative output end of the first power supply is respectively connected with the other end of the first capacitor C1 and the second input end of the common mode choke coil L; a common end of a first output end of the common mode choke coil L, which is respectively connected with one end of the second capacitor C2 and one end of the fourth capacitor C4 and is connected with the first end of the MOS transistor 1, is grounded, and a common end of a second output end of the common mode choke coil L, which is respectively connected with one end of the third capacitor C3 and the other end of the fourth capacitor C4 and is connected with the other end of the third capacitor C3 and the other end of the fourth capacitor C4; the other end of the second capacitor C2 and the other end of the third capacitor C3 are connected, and the connected common end is grounded;
the common-mode choke coil L, the second capacitor C2 and the third capacitor C3 are used for filtering out common-mode interference;
the first capacitor C1 and the fourth capacitor C4 are used for filtering out the series mode interference.
Electromagnetic interference is kept apart through filtering common mode interference and series mode interference in this embodiment, and specifically, the effect of steady voltage can also be played in not only the filtering series mode interference of this here of fourth electric capacity C4.
In conclusion, the power supply of the first power supply is more stable by filtering out common mode interference and series mode interference, and the power supply device is suitable for power supply occasions with higher requirements on voltage stability.
As a preferred embodiment, the load comprises a second control module;
the device also comprises a first driving module 6, a second driving module 7, a power switch 8 and a controllable switch module 5;
the input end of the first driving module 6 is connected with the output end of the first power supply through the power switch 8, the control end of the power switch 8 is connected with the third control module 9, and the first driving module 6 is used for outputting a first signal for controlling the controllable switch module 5 to be closed when the third control module 9 controls the power switch 8 to be closed;
the input end of the second driving module 7 is connected with the second control module and is used for outputting a second signal for controlling the controllable switch module 5 to be closed after receiving the driving voltage output by the second control module after being electrified;
the first end of the controllable switch module 5 is connected with the output end of the isolation module 3 and the second end of the MOS tube 1, the second end of the controllable switch module 5 is connected with a load, and the control end of the controllable switch module 5 is connected with the output end of the first driving module 6 and the output end of the second driving module 7 respectively, and is used for being closed when receiving the first signal and/or the second signal, or being disconnected.
In this embodiment, a controllable switch module 5 is arranged on a circuit connecting a load after a branch where a first power source is located and a branch where a second power source is located are connected in parallel to control whether to supply power to the load, and the controllable switch module 5 is controlled by a first driving module 6 and a second driving module 7.
Specifically, the second control module may be a core control unit of the load, the third control module 9 may control the second control module, and there may be information interaction between the third control module 9 and the second control module. When the first power supply supplies power to the load, the first driving module 6 outputs a first signal for controlling the controllable switch module 5 to be closed when the third control module 9 controls the power switch 8 to be closed, at this time, the controllable switch module 5 is closed, the first power supply supplies power to the load, then the second control module in the load is powered on and outputs a driving voltage to the second driving module 7, the second driving module 7 outputs a second signal for controlling the controllable switch module 5 to be closed at this time, the controllable switch module 5 is still closed at this time, the third control module 9 performs information interaction with the second control module to know that the second control module is powered on at this time, the power switch 8 can be controlled to be opened to enable the first driving module 6 to stop outputting the first signal, only the second signal controls the controllable switch module 5 to be closed, and the circuit for supplying power to the load is maintained to be connected.
The input signal of the first driving module 6 may be 24v, and the input signal of the second driving module 7 may be 3.3v, which is not limited herein.
To sum up, the controllable switch module 5, the first driving module 6 and the second driving module 7 are arranged to control the on and off of a circuit for connecting the load after the branch where the first power supply is located and the branch where the second power supply is located are connected in parallel, so that the power supply to the load is better controlled, and the reliability and the safety of the power supply circuit are improved.
In addition, the device for supplying power with low-voltage power can have portability and reproducibility through a design standard interface, and effectively promotes the practicability and industrialization of high-efficiency and high-safety power supply to a dual-power circuit in the industrial production process.
As a preferred embodiment, the third control module 9 is further configured to control the power switch 8 to turn off after the second control module outputs the driving voltage after being powered on.
In this embodiment, the third control module 9 may control the second control module, and there may be information interaction between the third control module 9 and the second control module. Specifically, when the third control module 9 performs information interaction with the second control module in the load and knows that the second control module is powered on and outputs a driving signal, the third control module can control the power switch 8 to be switched off, and only the second signal output by the second driving module 7 controls the controllable switch module 5; the controllable switch module 5 may be continuously controlled by the first signal and the second signal together without controlling the power switch 8 to be turned off, which is not particularly limited herein.
In summary, after the second control module in the load is powered on and outputs the driving voltage, the second signal may control the controllable switch module 5, or the first signal and the second signal may jointly control the controllable switch module 5, so that flexibility of controlling the controllable switch module 5 is increased.
As a preferred embodiment, the controllable switch module 5 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor Q3, and a second PMOS transistor Q2;
one end of the third resistor R3 is connected to the source of the second PMOS transistor Q2, and the connected common end serves as the first end of the controllable switch module 5, and the drain of the second PMOS transistor Q2 serves as the second end of the controllable switch module 5; the other end of the third resistor R3 is respectively connected with the grid of the second PMOS tube Q2 and one end of the fourth resistor R4; a collector of the first triode Q3 is connected with the other end of the fourth resistor R4, a base of the first triode Q3 is connected with one end of the fifth resistor R5, and a connected common end serves as a control end of the controllable switch module 5, and an emitter of the first triode Q3 is connected with the other end of the fifth resistor R5, and a connected common end is grounded;
the first triode Q3 is used for being closed when receiving the first signal and/or the second signal, and is opened when not receiving the first signal and/or the second signal;
the second PMOS transistor Q2 is configured to close when the first transistor Q3 is closed and to open when the first transistor Q3 is open.
In this embodiment, the first transistor Q3 is controlled by the first driving module 6 and the second driving module 7, and the second PMOS transistor Q2 is controlled by the first transistor Q3, so that the second PMOS transistor Q2 outputs a supply voltage to a load.
Specifically, the first signal and the second signal may be both high levels, when the base of the first triode Q3 receives the first signal and/or the second signal, the voltage at the two ends of the fifth resistor R5 turns on the first triode Q3, at this time, the third resistor R3 and the fourth resistor R4 are grounded after being connected in series, the voltage at the two ends of the third resistor R3 turns on the second PMOS transistor Q2, the second PMOS transistor Q2 outputs the supply voltage to the load, the voltage drop of the supply voltage on the second PMOS transistor Q2 is small, the power loss caused by the voltage drop is also small, the power of the load is large, the power can be supplied to a high-power load, and the power supply efficiency is improved.
When the base of the first triode Q3 does not receive the first signal and does not receive the second signal, that is, when the base receives the low level, the first triode Q3 is turned off, and further the second PMOS transistor Q2 is turned off, and at this time, the body diode in the second PMOS transistor Q2 intercepts the supply voltage of the load.
In addition, one end of a seventh capacitor C7 may be connected between the drain of the second PMOS transistor Q2 and the load, and the other end of the seventh capacitor C7 may be grounded to perform voltage stabilization.
In summary, the first transistor Q3 is controlled first, and then the second PMOS transistor Q2 is controlled by the first transistor Q3, so that the second PMOS transistor Q2 outputs the power supply voltage to the load, the control is simple and convenient, the voltage drop on the second PMOS transistor Q2 is small, and the power loss is also small.
As a preferred embodiment, the first driving module 6 includes a sixth resistor R6 and a seventh resistor R7; one end of the sixth resistor R6 is used as the input end of the first driving module 6, the other end of the sixth resistor R6 is connected with one end of the seventh resistor R7, the common end of the connection is used as the output end of the first driving module 6, and the other end of the seventh resistor R7 is grounded.
In this embodiment, the first driving module 6 outputs the first signal after being stepped down by the sixth resistor R6 and the seventh resistor R7, so as to prevent the first signal from damaging the controllable switch module 5.
As shown in fig. 2, the first zener diode D1, the eighth capacitor C8, and the twelfth resistor R12 may be further disposed in the first driving module 6, and the first zener diode D1 is used for voltage stabilization, and the eighth capacitor C8 and the twelfth resistor R12 are used for filtering, so as to improve reliability of the first signal.
As a preferred embodiment, the second driving module 7 includes an eighth resistor R8, a ninth resistor R9, a second transistor Q4, an optocoupler U, a tenth resistor R10, an eleventh resistor R11, a third power VCC3, and a fourth power VCC 4;
one end of the eighth resistor R8 is used as the input end of the second driving module 7, and the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9 and the base of the second transistor Q4, respectively; the other end of the ninth resistor R9 is connected with the emitter of the second triode Q4, and the connected common end is grounded; the cathode of the optocoupler U is connected with the collector of the second triode Q4, the anode of the optocoupler U is connected with one end of a tenth resistor R10, the collector of the optocoupler U is connected with a third power supply VCC3, and the emitter of the optocoupler U is connected with one end of an eleventh resistor R11; the other end of the eleventh resistor R11 is used as the output end of the second driving module 7; the other end of the tenth resistor R10 is connected to a fourth power supply VCC 4;
the second triode Q4 is used for being closed after receiving the driving voltage output by the second control module after being electrified;
the optocoupler U is configured to electrically isolate the second transistor Q4 when it is closed and output a second signal for controlling the closing of the controllable switch module 5.
In this embodiment, the driving voltage is reduced through the eighth resistor R8 and the ninth resistor R9, the voltage at the two ends of the ninth resistor R9 turns on the second triode Q4, and after the second triode Q4 is turned on, the second triode Q4 is isolated through the optocoupler U, and then a second signal is output. The voltage input by the collector of the optocoupler U may be the voltage output by the branch where the second power supply is located, and the fourth power supply VCC4 may be a power supply with an output voltage of 3.3 v.
In conclusion, the second signal output after the second triode Q4 and the optocoupler U are isolated is more stable, which is beneficial to controlling the controllable switch module 5.
In addition, the second driving module 7 may be provided with a second zener diode D2, as shown in fig. 2, for voltage stabilization. The second driving module 7 may further include a fifth capacitor, one end of the fifth capacitor is connected to the eighth resistor R8 and the second control module, the other end of the fifth capacitor is grounded, the driving voltage charges the fifth capacitor when normal, when the driving voltage does not satisfy a preset value, for example, at the moment of power failure of the first power supply, the power failure time is about microsecond level, at this time, the fifth capacitor discharges to output a second signal with, for example, a 3.3v high level, and the conduction of the controllable switch module 5 is maintained, so that power supply from the first power supply is switched to power supply from the second power supply without power interruption, and reliability and stability of power supply are improved.
As a preferred embodiment, the device further includes a sixth capacitor C6, one end of the sixth capacitor C6 is connected to the output terminal of the isolation module 3, the second terminal of the MOS transistor 1, and the load, respectively, and the other end of the sixth capacitor C6 is grounded.
In this embodiment, when the first power source or the second power source supplies power to the load, the sixth capacitor C6 is charged at the same time; at the moment when the first power supply is switched to the second power supply to supply power to the load or the second power supply is switched to the first power supply to supply power to the load, the sixth capacitor C6 discharges to maintain the power supply to the load, so that the reliability and stability of the power supply are improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a converter provided in the present application, which includes the above-mentioned low-voltage power supply device.
The converter formed by the device powered by the low-voltage power can be used as a controller for driving a double-winding high-power permanent magnet synchronous motor, and the converter mainly comprises a driving circuit, a main power circuit, a main control chip DSP (Digital Signal Processing) + FPGA (Field Programmable Gate Array), a protection circuit, a high-precision AD (analog-to-Digital) sampling circuit, a position decoding circuit, an interface circuit and the device powered by the low-voltage power, as shown in fig. 3.
The permanent magnet synchronous motor is driven by the double-driving circuit and the double-main-power circuit to achieve high-power double-winding permanent magnet synchronous motor.
The low-voltage power supply device supplies power to a main control chip DSP + FPGA; the main control chip DSP + FPGA realizes the functions of vector control algorithm, fault protection, upper computer communication and the like; the interface circuit realizes the level conversion of signals; the driving circuit realizes reliable on and off of the switching device in the corresponding main power circuit; the main power circuit realizes power amplification, and can realize power amplification of different grades according to different Insulated Gate Bipolar Transistors (IGBT) or silicon carbide power devices; the position decoding circuit converts an output signal of a rotary transformer in the permanent magnet synchronous motor into a position signal of the permanent magnet synchronous motor; the high-precision AD sampling circuit realizes the detection of the temperature of the permanent magnet synchronous motor, the temperature of an IGBT (insulated gate bipolar transistor), the phase current of the permanent magnet synchronous motor and the bus voltage; the protection circuit realizes the protection of the temperature of the permanent magnet synchronous motor, the IGBT temperature, the phase current of the permanent magnet synchronous motor and the bus voltage; the temperature sensor, position sensor and current sensor are shown in fig. 3.
The converter is used as a load of the low-voltage power supply device, and the main control chip DSP + FPGA is used as a second control module in the load of the low-voltage power supply device; the 650v direct-current power supply is used for increasing input power of two main power circuits to drive the permanent magnet synchronous motor, meanwhile, the 650v direct-current power supply can also be used as a second power supply of a device for supplying power by low-voltage power, a 24v storage battery is used as a first power supply of the device for supplying power by low-voltage power, the device for supplying power by low-voltage power is usually supplied by the 24v storage battery, and when the 24v storage battery is in power failure, the 650v direct-current power supply is used for supplying power.
The interface circuit communicates with a superior module, such as a VCU (Vehicle control unit), which controls the DSP and FPGA of the main control chip through a CAN (Controller Area Network) communication interface, the superior module has information interaction with the DSP and FPGA of the main control chip, the superior module CAN also be used as a third control module 9 to control a switch at the 24v storage battery, and the controlled switch is a power switch 8; when the device powered by low-voltage power is debugged and cannot be powered, the control power interface can be connected with a 24v power supply, and then the power supply is supplied to the DSP + FPGA of the main control chip through the interface circuit; the 24v storage battery is a first power supply in the device for supplying power by low-voltage power, the anodes of the 24v storage battery are connected with two switches, a branch where one switch is located is used for supplying power, the other switch can be a power switch 8 controlled by a third control module 9, the branch where the other switch is located can be connected with the input end of a first driving module 6, the FPGA can also be connected with the input end of a second driving module 7, and the first driving module 6 and the second driving module 7 jointly control whether the device supplies power for a main control chip DSP + FPGA.
For an introduction of the device for supplying power with low voltage power in the converter provided by the present application, please refer to the above embodiments, which are not described herein again.
It should be noted that, in the present specification, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The device for supplying power with low-voltage power is characterized by comprising an MOS (metal oxide semiconductor) tube, a first control module, an isolation module and a DC/DC (direct current/direct current) converter;
the output end of the first power supply is connected with the first end of the MOS tube, the output end of the second power supply is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is connected with the input end of the isolation module, the output end of the isolation module is connected with the second end of the MOS tube, and the connected common end is connected with a load;
the first control module is connected with the control end of the MOS tube and used for controlling the MOS tube to be conducted when the first power supply outputs voltage.
2. The low voltage power supply of claim 1, wherein the MOS transistor is a first PMOS transistor, and the first control module comprises a first resistor and a second resistor;
the drain electrode of the first PMOS tube is used as the first end of the MOS tube, the source electrode of the first PMOS tube is used as the second end of the MOS tube, and the grid electrode of the first PMOS tube is used as the control end of the MOS tube; one end of the first resistor is connected with a source electrode of the first PMOS tube, the other end of the first resistor is connected with one end of the second resistor, a public end of the second resistor is connected with a grid electrode of the first PMOS tube, and the other end of the second resistor is grounded.
3. The low voltage power supplying apparatus according to claim 1, further comprising a first capacitor, a common mode choke, a second capacitor, a third capacitor and a fourth capacitor;
the positive output end of the first power supply is respectively connected with one end of the first capacitor and the first input end of the common mode choke coil, and the negative output end of the first power supply is respectively connected with the other end of the first capacitor and the second input end of the common mode choke coil; a first output end of the common mode choke coil is respectively connected with one end of the second capacitor and one end of the fourth capacitor, and a connected common end is connected with a first end of the MOS tube; the other end of the second capacitor is connected with the other end of the third capacitor, and the connected common end is grounded;
the common mode choke coil, the second capacitor and the third capacitor are used for filtering common mode interference;
the first capacitor and the fourth capacitor are used for filtering out series mode interference.
4. The low voltage power supply of claim 1, wherein the load comprises a second control module;
the device also comprises a first driving module, a second driving module, a power switch and a controllable switch module;
the input end of the first driving module is connected with the output end of the first power supply through the power switch, the control end of the power switch is connected with the third control module, and the first driving module is used for outputting a first signal for controlling the controllable switch module to be closed when the third control module controls the power switch to be closed;
the input end of the second driving module is connected with the second control module and used for outputting a second signal for controlling the controllable switch module to be closed after receiving the driving voltage output by the second control module after the second control module is powered on;
the first end of the controllable switch module is connected with the output end of the isolation module and the second end of the MOS tube respectively, the second end of the controllable switch module is connected with the load, and the control end of the controllable switch module is connected with the output end of the first driving module and the output end of the second driving module respectively and used for being closed when the first signal and/or the second signal is received, or else, the controllable switch module is disconnected.
5. The low voltage power supply of claim 4, wherein the third control module is further configured to control the power switch to turn off after the second control module outputs the driving voltage after being powered on.
6. The low voltage power supply of claim 4, wherein the controllable switch module comprises a third resistor, a fourth resistor, a fifth resistor, a first transistor, and a second PMOS transistor;
one end of the third resistor is connected with the source electrode of the second PMOS tube, the public end of the third resistor is used as the first end of the controllable switch module, and the drain electrode of the second PMOS tube is used as the second end of the controllable switch module; the other end of the third resistor is respectively connected with the grid electrode of the second PMOS tube and one end of the fourth resistor; a collector of the first triode is connected with the other end of the fourth resistor, a base of the first triode is connected with one end of the fifth resistor, a connected public end of the base of the first triode is used as a control end of the controllable switch module, and an emitter of the first triode is connected with the other end of the fifth resistor, and a connected public end of the emitter of the first triode is grounded;
the first triode is used for being closed when the first signal and/or the second signal are received, and is opened when the first signal and/or the second signal are not received;
the second PMOS tube is used for being closed when the first triode is closed and being opened when the first triode is opened.
7. The low voltage power supply of claim 6, wherein the first driver module includes a sixth resistor and a seventh resistor; one end of the sixth resistor is used as the input end of the first driving module, the other end of the sixth resistor is connected with one end of the seventh resistor, the connected public end of the sixth resistor and one end of the seventh resistor is used as the output end of the first driving module, and the other end of the seventh resistor is grounded.
8. The low voltage power supplying apparatus according to claim 6, wherein the second driving module comprises an eighth resistor, a ninth resistor, a second transistor, an optocoupler, a tenth resistor, an eleventh resistor, a third power supply, and a fourth power supply;
one end of the eighth resistor is used as an input end of the second driving module, and the other end of the eighth resistor is connected with one end of the ninth resistor and the base of the second triode respectively; the other end of the ninth resistor is connected with the emitting electrode of the second triode, and the connected public end is grounded; the cathode of the optocoupler is connected with the collector of the second triode, the anode of the optocoupler is connected with one end of the tenth resistor, the collector of the optocoupler is connected with the third power supply, and the emitter of the optocoupler is connected with one end of the eleventh resistor; the other end of the eleventh resistor is used as an output end of the second driving module; the other end of the tenth resistor is connected with the fourth power supply;
the second triode is used for being closed after receiving the driving voltage output by the second control module after being electrified;
and the optocoupler is used for carrying out electrical isolation when the second triode is closed and outputting a second signal for controlling the controllable switch module to be closed.
9. The low-voltage power supply device according to any one of claims 1 to 8, further comprising a sixth capacitor, wherein one end of the sixth capacitor is connected to the output terminal of the isolation module, the second terminal of the MOS transistor, and the load, respectively, and the other end of the sixth capacitor is grounded.
10. A converter comprising a low voltage power supply as claimed in any one of claims 1 to 9.
CN202210065354.9A 2022-01-20 2022-01-20 Low-voltage power supply device and converter Pending CN114204667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210065354.9A CN114204667A (en) 2022-01-20 2022-01-20 Low-voltage power supply device and converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210065354.9A CN114204667A (en) 2022-01-20 2022-01-20 Low-voltage power supply device and converter

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CN114204667A true CN114204667A (en) 2022-03-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115158015A (en) * 2022-06-28 2022-10-11 华为数字能源技术有限公司 Power conversion device and electric automobile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115158015A (en) * 2022-06-28 2022-10-11 华为数字能源技术有限公司 Power conversion device and electric automobile

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