CN113078728A - Single-phase safe high-frequency isolation UPS power supply - Google Patents

Single-phase safe high-frequency isolation UPS power supply Download PDF

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Publication number
CN113078728A
CN113078728A CN202110492233.8A CN202110492233A CN113078728A CN 113078728 A CN113078728 A CN 113078728A CN 202110492233 A CN202110492233 A CN 202110492233A CN 113078728 A CN113078728 A CN 113078728A
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China
Prior art keywords
circuit
mos transistor
isolation
frequency
drain
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CN202110492233.8A
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Chinese (zh)
Inventor
向成志
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Huabang Chuangke Huizhou Intelligent Technology Co ltd
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Shenzhen Hongde Intelligent Co ltd
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Priority to CN202110492233.8A priority Critical patent/CN113078728A/en
Publication of CN113078728A publication Critical patent/CN113078728A/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
    • H02J9/062—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 AC 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a single-phase safe high-frequency isolation UPS (uninterrupted power supply) power supply, which comprises a controller, an AC (alternating current) power grid power supply circuit, an isolated output circuit and a battery charging and discharging bidirectional circuit. The AC power grid power supply circuit is provided with a mains supply input end, and mains supply is input and then sequentially converted into direct current output through the rectifying circuit and the PFC circuit; the isolated output circuit is connected with an AC power grid power supply circuit through a DC-AC converter; the DC output of the AC power supply circuit of the power grid is sequentially subjected to isolation transformation by the DC-AC converter and the isolation circuit to form high-frequency AC output, the output end of the isolation circuit is connected with the high-frequency rectifying circuit, the high-frequency AC output is transmitted to the inverter circuit through high-frequency rectification, and the inverter circuit is inverted into AC output; the battery charging and discharging bidirectional circuit is connected to the high-frequency rectifying circuit through the controller, and the high-frequency rectifying circuit is sent to the charging control part after high-frequency rectification and charges the battery after DC-DC isolation conversion. The output of the invention is completely isolated from the power grid, and people can not form a loop when contacting the output line L, thereby effectively protecting the personal safety.

Description

Single-phase safe high-frequency isolation UPS power supply
Technical Field
The invention relates to the technical field of power supplies, in particular to a single-phase safe high-frequency isolation UPS.
Background
Aiming at a TNS power supply system, when a person contacts an L live wire of electric equipment, current flows through a human body and the ground to form a loop, the human body is seriously injured, and if the leakage protection fails at the moment, the life of the person is threatened.
Therefore, it is necessary to develop a single-phase safe high-frequency isolated UPS power supply to solve the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a single-phase safe high-frequency isolation UPS, and the purpose of designing the safe high-frequency isolation UPS is to improve the safety performance of the power supply.
In order to solve the technical problem, the invention is realized by the following scheme: the invention relates to a single-phase safe high-frequency isolation UPS power supply, which comprises:
the controller is connected with commercial power and is provided with a port for sampling voltage and current of the commercial power in an isolation manner, a power supply port for an auxiliary power supply for the commercial power in an isolation manner, a charging and discharging control signal port, an output voltage and current isolation sampling port and an isolation driving port;
the AC power grid power supply circuit is provided with a commercial power input end, and commercial power is input and then sequentially converted into direct current output through the rectifying circuit and the PFC circuit;
the isolated output circuit is connected with the AC power grid power supply circuit through a DC-AC converter; the DC output of the AC power grid power supply circuit is sequentially subjected to isolation and transformation by the DC-AC converter and the isolation circuit to form high-frequency AC output, the output end of the isolation circuit is connected with the high-frequency rectifying circuit, the high-frequency AC output is transmitted to the inverter circuit through high-frequency rectification, and the inverter circuit is inverted into AC output;
and the battery charging and discharging bidirectional circuit is connected to the high-frequency rectifying circuit through the controller, and the high-frequency rectifying circuit is subjected to high-frequency rectification and then is sent to the charging control part to charge the battery after DC-DC isolation conversion.
Furthermore, when the commercial power input of the AC power grid power supply circuit is abnormal, the electric energy of the battery is subjected to DC-DC isolation conversion and then is transmitted to the inverter circuit, and then is subjected to inverter output and load carrying.
Furthermore, the voltage and current sampling of the commercial power input of the AC power grid supply circuit and the inversion output of the inverter circuit all use an isolation sampling sensor.
Furthermore, the isolation sampling sensor comprises one or a combination of a voltage transformer, a current transformer and a Hall sensor.
Further, the power tube drives of the PFC circuit, the isolation circuit, the inverter circuit and the charging and discharging circuit all adopt a completely isolated drive mode: the method comprises one or a combination of optical coupling isolation drive, isolation transformer isolation drive and isolation drive of an isolation IC chip.
Furthermore, the isolated output circuit is isolated by adopting a high-frequency isolation transformer, and the circuit structure of the battery charging and discharging bidirectional circuit connected with the high-frequency rectification circuit comprises one of a full-bridge conversion circuit, an LLC resonance conversion circuit and a push-pull conversion circuit.
Furthermore, the inverter circuit comprises one or a combination of an H4 bridge inverter conversion topology output, an H6 bridge conversion topology output and a half bridge conversion topology output.
Further, the controller comprises a controller circuit: the controller is used as a main control unit of the converter, and the power supply adopts an isolation auxiliary power supply which comprises a flyback small power supply or a forward small power supply or a linear auxiliary power supply formed by using a power frequency small transformer.
Furthermore, a live wire and a zero wire of the commercial power input end are connected with two front pin positions of a voltage transformer TV2, and a ground wire of the commercial power input end is connected with the controller;
two rear pins of the voltage transformer TV2 are connected to the controller;
the live wire of the utility power input end is further connected to pin 1 of a bridge rectifier diode D1, pin 3 of the bridge rectifier diode D1 is connected to an inductor L1, the anode of a polar capacitor C1, pin 2 thereof is connected to the zero line of the utility power input end, pin 4 thereof is connected to the cathode of a polar capacitor C1, the source of a MOS transistor Q1, the cathode of a polar capacitor C2, the source of a MOS transistor Q4, and the source of a MOS transistor Q5, the drain of the MOS transistor Q1 is connected to the other end of the inductor L1, the anode of a polar capacitor C2, the drain of a MOS transistor Q2, and the drain of a MOS transistor Q3, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q4, the source of the MOS transistor Q2 and the drain of the MOS transistor Q4 are connected to one of the primary winding of a high-frequency isolation transformer T3 at a circuit node, and the source of the MOS transistor Q3 is connected to the drain of the MOS transistor Q5, the other leg on the primary coil of the high frequency isolation transformer T3 is connected on a circuit node between the source of the MOS transistor Q3 and the drain of the MOS transistor Q5; the high-frequency isolation transformer T3 is a DC-AC converter;
a TA current transformer TA1 is further arranged in the AC power grid power supply circuit, and TA1 of the TA current transformer is connected to the controller;
two pins of the output end of the DC-AC converter are respectively connected to pin 1 of a bridge rectifier diode D2 and pin 2 of a bridge rectifier diode D2;
the 3 feet of the bridge rectifier diode D2 are respectively connected with a + BUS circuit, the anode of a polar capacitor C3, the drain of an MOS transistor Q6 and the drain of an MOS transistor Q7;
the 4 pins of the bridge rectifier diode D2 are respectively connected with a BUS circuit, the negative electrode of a polar capacitor C3, the source electrode of an MOS transistor Q8 and the source electrode of an MOS transistor Q9;
the source of the MOS transistor Q6 is connected to the drain of the MOS transistor Q8, and the circuit node between the source of the MOS transistor Q6 and the drain of the MOS transistor Q8 is connected to one leg of the primary coil of the inverter circuit TV 1;
the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the circuit node between the source of the MOS transistor Q7 and the drain of the MOS transistor Q9 is connected to the other leg of the primary coil of the inverter circuit TV 1;
a capacitor C4 is connected between two pins of a primary coil of the inverter circuit TV1, and two ends of the capacitor C4 are respectively connected with an output L and an output N;
a current sensor TA2 is connected in a circuit of the isolated output circuit, and the current sensor TA2 is connected to the controller;
an optical coupling isolation drive U4 is connected between the controller and the circuit of the AC power grid power supply circuit;
and an optical coupling isolation drive U2 is also connected between the controller and the circuit of the isolated output circuit.
Furthermore, a circuit between the battery charging and discharging bidirectional circuit and the controller is respectively connected with an optical coupling isolation drive U3 and an optical coupling isolation drive U4;
the battery charging and discharging bidirectional circuit comprises a battery pack, wherein the anode of the battery pack is connected with the anode of a polar capacitor C5, the drain of an MOS transistor Q10 and the drain of an MOS transistor Q12; the negative electrode of the battery pack is connected with the negative electrode of a polar capacitor C5, the source electrode of a MOS transistor Q11 and the source electrode of a MOS transistor Q13;
the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 are connected to each other and a circuit node between the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 is connected to a leg of the primary coil of a high frequency isolation transformer T4;
the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 are connected to each other and a circuit node between the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 is connected to the other leg of the primary winding of a high frequency isolation transformer T4;
the source of the MOS transistor Q17 and the drain of the MOS transistor Q16 are connected to each other;
the source of the MOS transistor Q15 and the drain of the MOS transistor Q14 are connected to each other;
two ends of the secondary coil of the high-frequency isolation transformer T4 are respectively connected to: at a circuit node between the source of MOS transistor Q17 and the drain of MOS transistor Q16, at a circuit node between the source of MOS transistor Q15 and the drain of MOS transistor Q14;
the drain of the MOS transistor Q17 and the drain of the MOS transistor Q15 are connected to a + BUS circuit;
the source of the MOS transistor Q16 and the source of the MOS transistor Q14 are connected to a-BUS circuit;
a polarity capacitor C6 is connected between the + BUS circuit and the-BUS circuit, wherein the + BUS circuit is connected to the anode of the polarity capacitor C6.
Compared with the prior art, the invention has the beneficial effects that: the high-frequency isolation UPS power supply system has the advantages that the output is completely isolated from the power grid, and people can not form a loop when contacting the output line L, so that the personal safety can be effectively protected.
Drawings
Fig. 1 is a schematic block diagram of a safe high-frequency isolation UPS power supply of the present invention.
Fig. 2 is a schematic diagram of a safe high-frequency isolated UPS power supply of the present invention.
Fig. 3 is a diagram of the AC grid supply circuit of the present invention.
FIG. 4 is a diagram of an isolated output circuit of the present invention.
FIG. 5 is a battery charging/discharging bidirectional circuit diagram according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and thus the protection scope of the present invention is more clearly and clearly defined. It should be apparent that the described embodiments of the present invention are only some embodiments of the present invention, and 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1: the concrete structure of the invention is as follows:
referring to fig. 1-5, a single-phase safety high-frequency isolation UPS power supply of the present invention includes:
the controller 1 is connected with commercial power and is provided with a port for sampling voltage and current of the commercial power in an isolation manner, a power supply port for an auxiliary power supply for the commercial power in an isolation manner, a charging and discharging control signal port, an output voltage and current isolation sampling port and an isolation driving port;
the AC power grid power supply circuit 2 is provided with a commercial power input end, and commercial power is sequentially converted into direct current output through a rectifying circuit and a PFC circuit after being input;
the isolated output circuit 3 is connected with the AC power grid power supply circuit through a DC-AC converter; the DC output of the AC power grid power supply circuit is sequentially subjected to isolation and transformation by the DC-AC converter and the isolation circuit to form high-frequency AC output, the output end of the isolation circuit is connected with the high-frequency rectifying circuit, the high-frequency AC output is transmitted to the inverter circuit through high-frequency rectification, and the inverter circuit is inverted into AC output;
and the battery charging and discharging bidirectional circuit 4 is connected to the high-frequency rectifying circuit through the controller 1, and the high-frequency rectifying circuit is subjected to high-frequency rectification and then is sent to the charging control part to charge the battery after DC-DC isolation conversion.
A preferred technical solution of this embodiment: when the commercial power input of the AC power grid power supply circuit 2 is abnormal, the electric energy of the battery is transmitted to the inverter circuit after being subjected to DC-DC isolation conversion, and then is subjected to inverter output load.
A preferred technical solution of this embodiment: and the mains supply input of the AC power grid power supply circuit 2 and the voltage and current sampling of the inversion output of the inverter circuit both use isolated sampling sensors.
A preferred technical solution of this embodiment: the isolation sampling sensor comprises one or a combination of a voltage transformer, a current transformer and a Hall sensor.
A preferred technical solution of this embodiment: the power tube drives of the PFC circuit, the isolation circuit, the inverter circuit and the charging and discharging circuit all adopt a completely isolated drive mode: the method comprises one or a combination of optical coupling isolation drive, isolation transformer isolation drive and isolation drive of an isolation IC chip.
A preferred technical solution of this embodiment: the isolated output circuit 3 is isolated by adopting a high-frequency isolation transformer, and the circuit structure of the battery charging and discharging bidirectional circuit 4 connected with the high-frequency rectifying circuit comprises one of a full-bridge conversion circuit, an LLC resonance conversion circuit and a push-pull conversion circuit.
A preferred technical solution of this embodiment: the inverter circuit comprises one or a combination of H4 bridge inverter conversion topology output, H6 bridge conversion topology output and half bridge conversion topology output.
A preferred technical solution of this embodiment: the controller includes a controller circuit: the controller is used as a main control unit of the converter, and the power supply adopts an isolation auxiliary power supply which comprises a flyback small power supply or a forward small power supply or a linear auxiliary power supply formed by using a power frequency small transformer.
A preferred technical solution of this embodiment: the live wire and the zero wire of the commercial power input end are connected with two front pin positions of a voltage transformer TV2, and the ground wire of the commercial power input end is connected to the controller;
two rear pins of the voltage transformer TV2 are connected to the controller;
example 2:
as shown in fig. 2-4, the live wire of the utility power input terminal is further connected to pin 1 of a bridge rectifier diode D1, pin 3 of the bridge rectifier diode D1 is connected to an inductor L1, the anode of a polar capacitor C1, pin 2 thereof is connected to the zero line of the utility power input terminal, pin 4 thereof is connected to the cathode of a polar capacitor C1, the source of a MOS transistor Q1, the cathode of a polar capacitor C2, the source of a MOS transistor Q4, the source of a MOS transistor Q5, the drain of the MOS transistor Q1 is connected to the other end of the inductor L1, the anode of a polar capacitor C2, the drain of a MOS transistor Q2, and the drain of a MOS transistor Q3, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q4, a circuit node between the source of the MOS transistor Q2 and the drain of the MOS transistor Q4 is connected to one of the primary winding of a high-frequency isolation transformer T3, the source of the MOS transistor Q3 is connected to the drain of the MOS transistor Q5, and the circuit node between the source of the MOS transistor Q3 and the drain of the MOS transistor Q5 is connected to the other leg on the primary coil of the high frequency isolation transformer T3; the high-frequency isolation transformer T3 is a DC-AC converter;
a TA current transformer TA1 is further arranged in the AC power grid supply circuit 2, and TA current transformer TA1 is connected to the controller 1;
two pins of the output end of the DC-AC converter are respectively connected to pin 1 of a bridge rectifier diode D2 and pin 2 of a bridge rectifier diode D2;
the 3 feet of the bridge rectifier diode D2 are respectively connected with a + BUS circuit, the anode of a polar capacitor C3, the drain of an MOS transistor Q6 and the drain of an MOS transistor Q7;
the 4 pins of the bridge rectifier diode D2 are respectively connected with a BUS circuit, the negative electrode of a polar capacitor C3, the source electrode of an MOS transistor Q8 and the source electrode of an MOS transistor Q9;
the source of the MOS transistor Q6 is connected to the drain of the MOS transistor Q8, and the circuit node between the source of the MOS transistor Q6 and the drain of the MOS transistor Q8 is connected to one leg of the primary coil of the inverter circuit TV 1;
the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the circuit node between the source of the MOS transistor Q7 and the drain of the MOS transistor Q9 is connected to the other leg of the primary coil of the inverter circuit TV 1;
a capacitor C4 is connected between two pins of a primary coil of the inverter circuit TV1, and two ends of the capacitor C4 are respectively connected with an output L and an output N;
a current sensor TA2 is connected in the circuit of the isolated output circuit 3, and the current sensor TA2 is connected to the controller;
an optical coupling isolation drive U4 is connected between the controller and the circuit of the AC power grid power supply circuit 2;
and an optical coupling isolation drive U2 is also connected between the controller and the circuit of the isolated output circuit 3.
Example 3:
as shown in fig. 2 and 5, a preferred technical solution of the present embodiment: a circuit between the battery charging and discharging bidirectional circuit 4 and the controller is respectively connected with an optical coupling isolation drive U3 and an optical coupling isolation drive U4;
the battery charging and discharging bidirectional circuit 4 comprises a battery pack, and the anode of the battery pack is connected with the anode of a polar capacitor C5, the drain of a MOS transistor Q10 and the drain of a MOS transistor Q12; the negative electrode of the battery pack is connected with the negative electrode of a polar capacitor C5, the source electrode of a MOS transistor Q11 and the source electrode of a MOS transistor Q13;
the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 are connected to each other and a circuit node between the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 is connected to a leg of the primary coil of a high frequency isolation transformer T4;
the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 are connected to each other and a circuit node between the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 is connected to the other leg of the primary winding of a high frequency isolation transformer T4;
the source of the MOS transistor Q17 and the drain of the MOS transistor Q16 are connected to each other;
the source of the MOS transistor Q15 and the drain of the MOS transistor Q14 are connected to each other;
two ends of the secondary coil of the high-frequency isolation transformer T4 are respectively connected to: at a circuit node between the source of MOS transistor Q17 and the drain of MOS transistor Q16, at a circuit node between the source of MOS transistor Q15 and the drain of MOS transistor Q14;
the drain of the MOS transistor Q17 and the drain of the MOS transistor Q15 are connected to a + BUS circuit;
the source of the MOS transistor Q16 and the source of the MOS transistor Q14 are connected to a-BUS circuit;
a polarity capacitor C6 is connected between the + BUS circuit and the-BUS circuit, wherein the + BUS circuit is connected to the anode of the polarity capacitor C6.
Example 4:
the invention relates to a design method of a high-frequency isolation UPS (uninterrupted Power supply), which is an uninterruptible power supply system. When the commercial power is abnormal (such as voltage over range or frequency over range or direct power failure), the commercial power is turned off, the electricity of the battery pack returns to the front stage of the inverter circuit through the charging and discharging circuit, and then the load is carried through the inverter output, so that the effect of outputting uninterrupted power is achieved.
Aiming at a TNS power supply system, when a person contacts an L live wire of electric equipment, current flows through a human body and the ground to form a loop, the human body is seriously injured, and if the leakage protection fails at the moment, the life of the person is threatened. The system is a high-frequency isolation UPS power supply system, the output is completely isolated from the power grid, and people can not form a loop when contacting the output line L, so that the personal safety can be effectively protected.
The invention is divided into three parts of commercial power measurement, isolated output measurement and battery energy control. The commercial power input is converted into direct current through rectification and PFC, the direct current is converted into high-frequency alternating current through DC-AC isolation conversion, and the high-frequency alternating current is rectified and then sent to an inversion part (meanwhile, the high-frequency alternating current is sent to a charging control part to charge a battery after DC-DC isolation conversion), and then the high-frequency alternating current is inverted into alternating current output. After the commercial power is abnormal, the electric quantity of the battery is transmitted to the front of the inverter circuit after being isolated and converted by the DC-DC (direct current-direct current), namely (+ BUS and-BUS voltage), and then the battery is loaded through inverter output.
The purpose of 100% complete isolation of the input part and the output part of the power grid is achieved through power isolation conversion of a main topological structure, input and output isolation sampling and power tube isolation driving.
The voltage and current sampling of the commercial power input and the inversion output uses an isolation sampling sensor which comprises a voltage transformer, a current transformer or a Hall sensor and other components.
The PFC and isolation conversion and inversion part and the charging and discharging part adopt complete isolation drive: the method comprises an optical coupling isolation drive mode, an isolation transformer drive mode and an isolation IC chip drive mode.
An isolated transform part: a high-frequency isolation transformer is used for isolation, and the structure can be a full-bridge, push-pull, LLC (logical link control) conversion structure.
An inverter circuit: the inverter circuit comprises H4 bridge inversion, H6 bridge, half bridge and other conversion topology outputs.
The battery charge-discharge circuit: a high-frequency isolation transformer is used for isolation, and the charging circuit structure can be a full-bridge, push-pull, LLC (logical link control) conversion structure.
A controller circuit: the controller is used as a main control unit of the converter, and the power supply adopts an isolation auxiliary power supply comprising a flyback or forward small power supply or a linear auxiliary power supply formed by a power frequency small transformer. The sampling uses an isolation circuit, and the drive uses an optical coupler as isolation.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A single-phase safe high-frequency isolation UPS power supply is characterized by comprising:
the controller (1) is connected with commercial power and is provided with a port for sampling voltage and current of the commercial power in an isolation manner, a power supply port for an auxiliary power supply for the commercial power in an isolation manner, a charging and discharging control signal port, an output voltage and current isolation sampling port and an isolation driving port;
the AC power grid power supply circuit (2) is provided with a mains supply input end, and mains supply is input and then sequentially converted into direct current output through the rectifying circuit and the PFC circuit;
an isolated output circuit (3) connected to the AC power grid supply circuit through a DC-AC converter; the DC output of the AC power grid power supply circuit is sequentially subjected to isolation and transformation by the DC-AC converter and the isolation circuit to form high-frequency AC output, the output end of the isolation circuit is connected with the high-frequency rectifying circuit, the high-frequency AC output is transmitted to the inverter circuit through high-frequency rectification, and the inverter circuit is inverted into AC output;
and the battery charging and discharging bidirectional circuit (4) is connected to the high-frequency rectifying circuit through the controller (1), and the high-frequency rectifying circuit is subjected to high-frequency rectification and then is sent to the charging control part to charge the battery after DC-DC isolation conversion.
2. The single-phase safe high-frequency isolation UPS according to claim 1, wherein when the commercial power input of the AC power grid supply circuit (2) is abnormal, the electric energy of the battery is loaded through the inverter output before being sent to the inverter circuit after being subjected to DC-DC isolation conversion.
3. A single-phase safe high-frequency isolated UPS power supply according to claim 1, characterized by that, the voltage and current sampling of the mains input of the AC grid supply circuit (2) and the inverted output of the inverter circuit uses isolated sampling sensors.
4. The single-phase safe high-frequency isolating UPS according to claim 2, wherein the isolating sampling sensor comprises one or a combination of a voltage transformer, a current transformer and a Hall sensor.
5. The single-phase safe high-frequency isolation UPS according to claim 1, wherein the power tube driving of the PFC circuit, the isolation circuit, the inverter circuit and the charging and discharging circuit all adopt a completely isolated driving mode: the method comprises one or a combination of optical coupling isolation drive, isolation transformer isolation drive and isolation drive of an isolation IC chip.
6. The single-phase safe high-frequency isolated UPS according to claim 1, wherein the isolated output circuit (3) is isolated by a high-frequency isolation transformer, and the circuit structure of the battery charging and discharging bidirectional circuit (4) connected with the high-frequency rectification circuit comprises one of a full-bridge conversion circuit, an LLC resonant conversion circuit and a push-pull conversion circuit.
7. The single-phase safe high-frequency isolated UPS according to claim 1, wherein the inverter circuit comprises one or a combination of H4 bridge inverter topology output, H6 bridge inverter topology output and half-bridge inverter topology output.
8. A single-phase safe high-frequency isolating UPS power supply according to claim 1, wherein the controller comprises a controller circuit: the controller is used as a main control unit of the converter, and the power supply adopts an isolation auxiliary power supply which comprises a flyback small power supply or a forward small power supply or a linear auxiliary power supply formed by using a power frequency small transformer.
9. A single-phase safe high-frequency isolating UPS power supply according to claim 1, wherein the live and neutral wires of the mains input are connected to two front pins of a voltage transformer TV2, the ground wire of which is connected to the controller;
two rear pins of the voltage transformer TV2 are connected to the controller;
the live wire of the utility power input end is further connected to pin 1 of a bridge rectifier diode D1, pin 3 of the bridge rectifier diode D1 is connected to an inductor L1, the anode of a polar capacitor C1, pin 2 thereof is connected to the zero line of the utility power input end, pin 4 thereof is connected to the cathode of a polar capacitor C1, the source of a MOS transistor Q1, the cathode of a polar capacitor C2, the source of a MOS transistor Q4, and the source of a MOS transistor Q5, the drain of the MOS transistor Q1 is connected to the other end of the inductor L1, the anode of a polar capacitor C2, the drain of a MOS transistor Q2, and the drain of a MOS transistor Q3, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q4, the source of the MOS transistor Q2 and the drain of the MOS transistor Q4 are connected to one of the primary winding of a high-frequency isolation transformer T3 at a circuit node, and the source of the MOS transistor Q3 is connected to the drain of the MOS transistor Q5, the other leg on the primary coil of the high frequency isolation transformer T3 is connected on a circuit node between the source of the MOS transistor Q3 and the drain of the MOS transistor Q5; the high-frequency isolation transformer T3 is a DC-AC converter;
a TA current transformer TA1 is further arranged in the AC power grid supply circuit (2), and the TA current transformer TA1 is connected to the controller (1);
two pins of the output end of the DC-AC converter are respectively connected to pin 1 of a bridge rectifier diode D2 and pin 2 of a bridge rectifier diode D2;
the 3 feet of the bridge rectifier diode D2 are respectively connected with a + BUS circuit, the anode of a polar capacitor C3, the drain of an MOS transistor Q6 and the drain of an MOS transistor Q7;
the 4 pins of the bridge rectifier diode D2 are respectively connected with a BUS circuit, the negative electrode of a polar capacitor C3, the source electrode of an MOS transistor Q8 and the source electrode of an MOS transistor Q9;
the source of the MOS transistor Q6 is connected to the drain of the MOS transistor Q8, and the circuit node between the source of the MOS transistor Q6 and the drain of the MOS transistor Q8 is connected to one leg of the primary coil of the inverter circuit TV 1;
the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the circuit node between the source of the MOS transistor Q7 and the drain of the MOS transistor Q9 is connected to the other leg of the primary coil of the inverter circuit TV 1;
a capacitor C4 is connected between two pins of a primary coil of the inverter circuit TV1, and two ends of the capacitor C4 are respectively connected with an output L and an output N;
a current sensor TA2 is connected in the circuit of the isolated output circuit (3), and the current sensor TA2 is connected to the controller;
an optical coupling isolation drive U4 is connected between the controller and the AC power grid supply circuit (2);
and an optical coupling isolation drive U2 is also connected between the controller and the circuit of the isolated output circuit (3).
10. The single-phase safe high-frequency isolation UPS according to claim 1, wherein the circuit between the battery charging and discharging bidirectional circuit (4) and the controller is respectively connected with an optical coupling isolation drive U3 and an optical coupling isolation drive U4;
the battery charging and discharging bidirectional circuit (4) comprises a battery pack, wherein the anode of the battery pack is connected with the anode of a polar capacitor C5, the drain of a MOS transistor Q10 and the drain of a MOS transistor Q12; the negative electrode of the battery pack is connected with the negative electrode of a polar capacitor C5, the source electrode of a MOS transistor Q11 and the source electrode of a MOS transistor Q13;
the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 are connected to each other and a circuit node between the source of the MOS transistor Q10 and the drain of the MOS transistor Q11 is connected to a leg of the primary coil of a high frequency isolation transformer T4;
the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 are connected to each other and a circuit node between the source of the MOS transistor Q12 and the drain of the MOS transistor Q13 is connected to the other leg of the primary winding of a high frequency isolation transformer T4;
the source of the MOS transistor Q17 and the drain of the MOS transistor Q16 are connected to each other;
the source of the MOS transistor Q15 and the drain of the MOS transistor Q14 are connected to each other;
two ends of the secondary coil of the high-frequency isolation transformer T4 are respectively connected to: at a circuit node between the source of MOS transistor Q17 and the drain of MOS transistor Q16, at a circuit node between the source of MOS transistor Q15 and the drain of MOS transistor Q14;
the drain of the MOS transistor Q17 and the drain of the MOS transistor Q15 are connected to a + BUS circuit;
the source of the MOS transistor Q16 and the source of the MOS transistor Q14 are connected to a-BUS circuit;
a polarity capacitor C6 is connected between the + BUS circuit and the-BUS circuit, wherein the + BUS circuit is connected to the anode of the polarity capacitor C6.
CN202110492233.8A 2021-05-06 2021-05-06 Single-phase safe high-frequency isolation UPS power supply Pending CN113078728A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116436147A (en) * 2023-06-13 2023-07-14 苏州浪潮智能科技有限公司 Power supply circuit and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116436147A (en) * 2023-06-13 2023-07-14 苏州浪潮智能科技有限公司 Power supply circuit and electronic equipment
CN116436147B (en) * 2023-06-13 2023-09-19 苏州浪潮智能科技有限公司 Power supply circuit and electronic equipment

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