CN218603364U - Isolated constant current source circuit - Google Patents
Isolated constant current source circuit Download PDFInfo
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- CN218603364U CN218603364U CN202222707095.3U CN202222707095U CN218603364U CN 218603364 U CN218603364 U CN 218603364U CN 202222707095 U CN202222707095 U CN 202222707095U CN 218603364 U CN218603364 U CN 218603364U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides an isolated form constant current source circuit includes: the input end of the high power factor correction circuit unit is connected with the output end of the three-phase alternating current power supply; the input end of the direct current isolation conversion unit is connected with the output end of the high power factor correction circuit unit; the input end of the output bus filtering unit is connected with the output end of the direct current isolation conversion unit, and the output end of the output bus filtering unit is connected with the output terminal; when a three-phase alternating current power supply is connected, the high-power factor correction circuit unit outputs three direct current voltages, the direct current isolation conversion unit isolates and converts the three direct current voltages into three direct current constant current outputs, the three direct current constant current outputs are connected in parallel and input to the output bus filtering unit, and the three direct current constant current outputs are filtered and output to the output terminal. The utility model discloses realize high power factor's three-phase three-wire system power factor correction, make alternating current input and direct current constant current output keep apart electrically, ensured the high performance and the high reliability of power.
Description
Technical Field
The patent of the utility model relates to a power supply circuit hardware design field, in particular to isolated form constant current source circuit.
Background
The high-power constant current source is generally used in a power electronic conversion system, is used for outputting constant direct current and is widely applied. Generally, a high-power constant current source adopts three-phase alternating current input, a power factor correction circuit is adopted for improving input power factors, the passive correction and the active correction are generally divided into a three-phase PWM (pulse width modulation) controllable rectification circuit and a Vienna rectification circuit, the passive correction effect is poor, a high power factor cannot be achieved, algorithms of the three-phase PWM controllable rectification circuit and the Vienna rectification circuit are complex, a high-performance digital control technology is required, and the high-power constant current source cannot be completely suitable for all occasions.
Therefore, it is an urgent need to solve the problem of the skilled person how to provide a high-performance and easy-to-implement power factor correction circuit for a high-power constant current source.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides an isolated high-power-factor high-power constant current source circuit and a method, aiming at solving the problem of three-phase power factor correction of a high-power constant current source.
In some embodiments, the present invention provides an isolated constant current source circuit, comprising: the high-power factor correction circuit unit, the direct current isolation conversion unit and the output bus filtering unit;
the input end of the high power factor correction circuit unit is connected with the output end of the three-phase alternating current power supply;
the input end of the direct current isolation conversion unit is connected with the output end of the high power factor correction circuit unit;
the input end of the output bus filtering unit is connected with the output end of the direct current isolation conversion unit, and the output end of the output bus filtering unit is connected with an output terminal;
when a three-phase three-wire system alternating current power supply is connected, the high power factor correction circuit unit outputs three paths of direct current voltages respectively, the direct current isolation conversion unit isolates and converts the three paths of direct current voltages into three paths of direct current constant current outputs respectively, and the three paths of direct current constant current outputs are input to the output bus filtering unit in parallel and are output to an output terminal after being filtered by the output bus filtering unit.
In some embodiments: the high power factor correction circuit unit comprises three paths of high power factor correction circuits;
the first high-power factor correction circuit in the three high-power factor correction circuits is connected with a UV alternating-current power supply of the three-phase alternating-current power supply and is used for converting UV alternating-current power supply input into direct-current voltage output;
a second high-power-factor correction circuit in the three high-power-factor correction circuits is connected with a VW (voltage source) alternating current power supply of the three-phase alternating current power supply; the voltage converter is used for converting VW alternating current power supply input into direct current voltage output;
and a third high-power factor correction circuit in the three high-power factor correction circuits is connected with the UW alternating-current power supply of the three-phase alternating-current power supply and is used for converting the input of the UW alternating-current power supply into direct-current voltage and outputting the direct-current voltage.
In some embodiments: each high power factor correction circuit of the three high power factor correction circuits comprises: the circuit comprises a first bridge rectifier, a first inductor, a diode, a first capacitor and a first MOS (metal oxide semiconductor) tube; the first end and the second end of the first bridge rectifier are connected with the three-phase alternating-current power supply, the third end of the first bridge rectifier is connected with the first MOS tube and the first capacitor, and the fourth end of the first bridge rectifier is connected with the first inductor and the diode to serve as the output end of the high power factor correction circuit.
In some embodiments: the direct current isolation conversion unit comprises three direct current isolation conversion circuits;
the input end of a first path of direct-current isolation conversion circuit in the three paths of direct-current isolation conversion circuits is connected with the first path of high-power-factor correction circuit, and the output end of the first path of direct-current isolation conversion circuit is connected with the output bus filtering unit;
the input end of a second path of direct current isolation conversion circuit in the three paths of direct current isolation conversion circuits is connected with the second path of high power factor correction circuit, and the output end of the second path of direct current isolation conversion circuit is connected with the output bus filtering unit;
the input end of a third direct-current isolation conversion circuit in the three direct-current isolation conversion circuits is connected with the third high-power factor correction circuit, and the output end of the third direct-current isolation conversion circuit is connected with the output bus filtering unit.
In some embodiments: each direct current isolation conversion circuit of the three direct current isolation conversion circuits comprises: the second MOS tube, the third MOS tube, the second bridge rectifier, the second inductor, the third capacitor, the fourth capacitor and the fifth capacitor; the second MOS tube and the third MOS tube are connected in parallel between the third capacitor and the fourth capacitor and are connected with the second inductor; the second inductor is connected with the second bridge rectifier; the second bridge rectifier is connected with the fifth capacitor.
In some embodiments: the output bus filtering unit comprises an output bus filtering circuit, and the output bus filtering circuit comprises a third inductor and a sixth capacitor; the third inductor is connected with the direct current isolation conversion unit and the positive output terminal; the sixth capacitor is connected in parallel between the positive output terminal and the negative output terminal.
The utility model provides a high-power constant current source circuit of isolated form high power factor and method, handle the UV looks that the three-phase interchange came in and out respectively through three routes high power factor correction circuit, VW looks and WU have simplified the algorithm of three-phase active power factor correction mutually and can reach very high power factor, because this three routes direct current output voltage does not have public reference ground, so need keep apart the transform unit through three routes direct current and be kept apart the transform respectively and be direct current constant current output, so this three routes direct current output can be parallelly connected to the filtering output through bus filter unit together according to polarity to the output terminal owing to the level transformation through isolation transformer. The power factor correction circuit effectively simplifies the problems of level conversion and electrical isolation between the control algorithm of the power factor correction circuit and the input and output circuit, greatly increases the reliability and safety factor of the constant current source, and ensures the high performance and high reliability of electric energy conversion.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a circuit diagram of an embodiment of an isolated constant current source provided by the present invention;
fig. 2 is a circuit diagram of an embodiment of an isolated constant current source provided by the present invention.
Description of the main elements and symbols:
101. a high power factor correction circuit unit; 102. a DC isolation conversion unit; 103. an output bus filter unit; 1. a U-phase input of a three-phase alternating current power supply; 2. a V-phase input of a three-phase alternating current power supply; 3. a W-phase input of a three-phase alternating current power supply; 4. a UV high-phase power factor correction circuit; 5. a VW phase high power factor correction circuit; 6. a WU phase high power factor correction circuit; 7. a UV direct current isolation conversion circuit; 8. a UV direct current isolation conversion circuit; 9. a UV direct current isolation conversion circuit; 10. a bus filter circuit; 11. a positive output terminal Vo +; 12. the negative output terminal Vo-.
Detailed Description
The following description will further explain embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In some embodiments, the present invention provides an isolated constant current source circuit, comprising: a high power factor correction circuit unit 101, a direct current isolation conversion unit 102 and an output bus filtering unit 103.
In this embodiment, the isolated constant current source circuit is an isolated high power factor high power constant current source circuit, and aims to solve the problem of three-phase power factor correction of a high power constant current source.
The input end of the high power factor correction circuit unit 101 is connected with the output end of the three-phase alternating current power supply;
the input end of the dc isolation conversion unit 102 is connected to the output end of the high power factor correction circuit unit 101;
the input end of the output bus filtering unit 103 is connected with the output end of the direct current isolation transformation unit 102, and the output end of the output bus filtering unit 103 is connected with an output terminal;
when a three-phase three-wire system alternating current power supply is connected, the high power factor correction circuit unit 101 outputs three paths of direct current voltages respectively, the direct current isolation conversion unit 102 isolates and converts the three paths of direct current voltages into three paths of direct current constant current outputs respectively, and the three paths of direct current constant current outputs are input in parallel to the output bus filtering unit 103, filtered by the output bus filtering unit 103 and then output to an output terminal.
The utility model discloses a high power factor's three-phase three-wire system power factor correction to make alternating current input and direct current constant current output keep apart electrically, ensured the high performance and the high reliability of power.
In one embodiment, as shown in fig. 2, the high power factor correction circuit unit 101 includes a three-way high power factor correction circuit;
the first high-power factor correction circuit in the three high-power factor correction circuits is connected with a UV alternating-current power supply of the three-phase alternating-current power supply and is used for converting UV alternating-current power supply input into direct-current voltage output;
a second high-power factor correction circuit in the three high-power factor correction circuits is connected with a VW (voltage-variable) alternating-current power supply of the three-phase alternating-current power supply; the voltage converter is used for converting VW alternating current power supply input into direct current voltage output;
and a third high-power factor correction circuit in the three high-power factor correction circuits is connected with the UW alternating-current power supply of the three-phase alternating-current power supply and is used for converting the input of the UW alternating-current power supply into direct-current voltage and outputting the direct-current voltage.
In one embodiment, as shown in fig. 2, each high power factor correction circuit of the three high power factor correction circuits comprises: the circuit comprises a first bridge rectifier, a first inductor, a diode, a first capacitor and a first MOS (metal oxide semiconductor) tube; the first end and the second end of the first bridge rectifier are connected with the three-phase alternating current power supply, the third end of the first bridge rectifier is connected with the first MOS tube and the first capacitor, and the fourth end of the first bridge rectifier is connected with the first inductor and the diode to serve as the output end of the high power factor correction circuit.
In one embodiment, as shown in fig. 2, the dc isolation converting unit 102 includes a three-way dc isolation converting circuit;
the input end of a first path of direct-current isolation conversion circuit in the three paths of direct-current isolation conversion circuits is connected with the first path of high-power-factor correction circuit, and the output end of the first path of direct-current isolation conversion circuit is connected with the output bus filtering unit 103;
the input end of a second direct current isolation conversion circuit in the three direct current isolation conversion circuits is connected with the second high power factor correction circuit, and the output end of the second direct current isolation conversion circuit is connected with the output bus filtering unit 103;
the input end of a third direct-current isolation conversion circuit in the three direct-current isolation conversion circuits is connected with the third high power factor correction circuit, and the output end of the third direct-current isolation conversion circuit is connected with the output bus filtering unit 103.
In one embodiment, as shown in fig. 2, each dc isolation converter circuit of the three-way dc isolation converter circuit includes: the second MOS tube, the third MOS tube, the second bridge rectifier, the second inductor, the third capacitor, the fourth capacitor and the fifth capacitor; the second MOS tube and the third MOS tube are connected in parallel between the third capacitor and the fourth capacitor and are connected with the second inductor; the second inductor is connected with the second bridge rectifier; the second bridge rectifier is connected with the fifth capacitor.
In some embodiments: the output bus filtering unit 103 comprises an output bus filtering circuit, and the output bus filtering circuit comprises a third inductor and a sixth capacitor; the third inductor is connected with the direct current isolation conversion unit 102 and the positive output terminal; the sixth capacitor is connected in parallel between the positive output terminal and the negative output terminal.
The utility model provides a high-power constant current source circuit of isolated form high power factor, handle the UV looks that the three-phase interchange came in and go out respectively through three routes high power factor correction circuit, VW looks and WU have simplified the algorithm of three-phase active power factor correction mutually and can reach very high power factor, because these three routes direct current output voltage do not have the public reference ground, so need keep apart transform unit 102 through three routes direct current and keep apart the transform into direct current constant current output respectively with it, so this three routes direct current output can be parallelly connected to the filtering output through bus filter unit together according to polarity to the output terminal owing to the level transformation through isolation transformer. The power factor correction circuit effectively simplifies the problems of level conversion and electrical isolation between the control algorithm of the power factor correction circuit and the input and output circuit, greatly increases the reliability and safety factor of the constant current source, and ensures the high performance and high reliability of electric energy conversion.
In one embodiment, as shown in fig. 1 and 2, the present application provides an isolated high power factor and high power constant current source circuit, including: three-way high power factor correction circuit unit 101, three-way dc isolation conversion circuit unit and output bus filter unit 103, wherein,
the input of the three-way high-power-factor correction circuit unit 101 is respectively connected with a UV, a VW and a UW three-phase alternating-current power supply, the input end of the three-way direct-current isolation transformation unit 102 is respectively connected with the output end of the three-way high-power-factor correction circuit unit 101, the input end of the output bus filtering unit 103 is respectively connected with the output end of the three-way direct-current isolation transformation unit 102, and the output end of the output bus filtering unit 103 is connected with the output terminals Vo +, vo-; when a UVW three-phase three-wire system ac power supply is connected, the three-way high power factor correction circuit unit 101 outputs three stable dc voltages, the three-way dc isolation conversion unit 102 isolates and converts the three dc voltages into three constant current outputs, and the three constant current outputs are input in parallel to the output bus filtering unit 103, filtered by the output bus filtering unit, and then output to the output terminals Vo + and Vo-.
Illustratively, the inputs of the three high-power-factor correction circuit units 4, 5, and 6 are respectively connected to three-phase ac power supplies 1, 2, and 3, the inputs of the three dc isolation conversion units 7, 8, and 9 are respectively connected to the outputs of the three high-power-factor correction circuit units 4, 5, and 6, the input of the output bus filter unit 10 103 is respectively connected to the outputs of the three dc isolation conversion units 7, 8, and 9, and the output of the output bus filter unit 10 103 is connected to the output terminals 11 and 12; when a UVW three-phase three-wire system ac power supply is connected, the three-way high power factor correction circuit unit 101 outputs three stable dc voltages, the three-way dc isolation conversion unit 102 isolates and converts the three dc voltages into three constant current outputs, and the three constant current outputs are input in parallel to the output bus filtering unit 103, filtered by the output bus filtering unit, and then output to the output terminals Vo + and Vo-.
In one embodiment, the input terminals of the three-way dc-isolated conversion unit 102 are respectively connected to the output terminals of the three-way pfc circuit unit 101.
In one embodiment, the input terminals of the three-way dc isolation converting units 102 are respectively connected to the output terminals of the three-way high power factor correction circuit unit 101.
In one embodiment, the input terminals of the output bus filtering unit 103 are respectively connected to the output terminals of the three-way dc isolation converting unit 102.
In an actual scene, the isolated constant current source circuit is applied to an isolated high-power-factor high-power constant current source method, and comprises the following steps: the three-way high power factor correction circuit unit 101 converts the UV, VW and WU three-phase alternating current energy input into direct current voltage output respectively; the three-way direct-current isolation conversion unit 102 is used for respectively converting three-way direct-current voltage input isolation into three-way direct-current constant-current output; the direct current constant current output is input to the output bus filtering unit 103 in parallel for filtering and is output to the output terminals Vo +, vo-.
The utility model provides a high-power constant current source circuit of isolated form high power factor, handle the UV looks that the three-phase interchange came in and out respectively through three routes high power factor correction circuit, VW looks and WU have simplified the algorithm of three-phase active power factor correction mutually and can reach very high power factor, because this three routes direct current output voltage does not have public reference ground, so need keep apart transform unit 102 through three routes direct current and keep apart it respectively and change the direct current constant current output, so this three routes direct current output can be parallelly connected to the filtering output through bus filter unit together according to polarity to the output terminal owing to the level transformation through isolation transformer. The problems of level conversion and electrical isolation between a power factor correction circuit control algorithm and an input/output circuit are effectively solved, the reliability and the safety coefficient of the constant current source are greatly increased, and the high performance and the high reliability of electric energy conversion are guaranteed.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and these embodiments are still within the scope of the invention.
Claims (6)
1. An isolated constant current source circuit, comprising: the high-power factor correction circuit unit, the direct current isolation conversion unit and the output bus filtering unit;
the input end of the high power factor correction circuit unit is connected with the output end of the three-phase alternating current power supply;
the input end of the direct current isolation conversion unit is connected with the output end of the high power factor correction circuit unit;
the input end of the output bus filtering unit is connected with the output end of the direct current isolation conversion unit, and the output end of the output bus filtering unit is connected with an output terminal;
when a three-phase three-wire system alternating current power supply is connected, the high power factor correction circuit unit outputs three paths of direct current voltages respectively, the direct current isolation conversion unit isolates and converts the three paths of direct current voltages into three paths of direct current constant current outputs respectively, and the three paths of direct current constant current outputs are input to the output bus filtering unit in parallel and are filtered by the output bus filtering unit and then are output to the output terminal.
2. The isolated constant current source circuit according to claim 1, wherein: the high power factor correction circuit unit comprises three paths of high power factor correction circuits;
the first path of high-power factor correction circuit in the three paths of high-power factor correction circuits is connected with the UV alternating-current power supply of the three-phase alternating-current power supply and is used for converting the input of the UV alternating-current power supply into direct-current voltage and outputting the direct-current voltage;
a second high-power-factor correction circuit in the three high-power-factor correction circuits is connected with a VW (voltage source) alternating current power supply of the three-phase alternating current power supply; the VW AC power supply input is converted into DC voltage output;
and a third high-power factor correction circuit in the three high-power factor correction circuits is connected with a UW alternating-current power supply of the three-phase alternating-current power supply and is used for converting the input of the UW alternating-current power supply into direct-current voltage and outputting the direct-current voltage.
3. The isolated constant current source circuit according to claim 2, wherein: each high power factor correction circuit of the three high power factor correction circuits comprises: the circuit comprises a first bridge rectifier, a first inductor, a diode, a first capacitor and a first MOS (metal oxide semiconductor) tube; the first end and the second end of the first bridge rectifier are connected with the three-phase alternating current power supply, the third end of the first bridge rectifier is connected with the first MOS tube and the first capacitor, and the fourth end of the first bridge rectifier is connected with the first inductor and the diode to serve as the output end of the high power factor correction circuit.
4. The isolated constant current source circuit according to claim 2, wherein: the direct current isolation conversion unit comprises three direct current isolation conversion circuits;
the input end of a first path of direct-current isolation conversion circuit in the three paths of direct-current isolation conversion circuits is connected with the first path of high-power-factor correction circuit, and the output end of the first path of direct-current isolation conversion circuit is connected with the output bus filtering unit;
the input end of a second path of direct current isolation conversion circuit in the three paths of direct current isolation conversion circuits is connected with the second path of high power factor correction circuit, and the output end of the second path of direct current isolation conversion circuit is connected with the output bus filtering unit;
the input end of a third direct-current isolation conversion circuit in the three direct-current isolation conversion circuits is connected with the third high-power factor correction circuit, and the output end of the third direct-current isolation conversion circuit is connected with the output bus filtering unit.
5. The isolated constant current source circuit according to claim 4, wherein: each direct current isolation conversion circuit of the three direct current isolation conversion circuits comprises: the second MOS tube, the third MOS tube, the second bridge rectifier, the second inductor, the third capacitor, the fourth capacitor and the fifth capacitor; the second MOS tube and the third MOS tube are connected in parallel between the third capacitor and the fourth capacitor and are connected with the second inductor; the second inductor is connected with the second bridge rectifier; the second bridge rectifier is connected with the fifth capacitor.
6. The isolated constant current source circuit according to any one of claims 1 to 5, characterized in that: the output bus filter unit comprises an output bus filter circuit, and the output bus filter circuit comprises a third inductor and a sixth capacitor; the third inductor is connected with the direct current isolation conversion unit and the positive output terminal; the sixth capacitor is connected in parallel between the positive output terminal and the negative output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222707095.3U CN218603364U (en) | 2022-10-14 | 2022-10-14 | Isolated constant current source circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222707095.3U CN218603364U (en) | 2022-10-14 | 2022-10-14 | Isolated constant current source circuit |
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| CN218603364U true CN218603364U (en) | 2023-03-10 |
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