CN112448590A - High-frequency single-phase safety power supply device and system - Google Patents
High-frequency single-phase safety power supply device and system Download PDFInfo
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- CN112448590A CN112448590A CN201910838556.0A CN201910838556A CN112448590A CN 112448590 A CN112448590 A CN 112448590A CN 201910838556 A CN201910838556 A CN 201910838556A CN 112448590 A CN112448590 A CN 112448590A
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
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Abstract
The application discloses high frequency single-phase safety power supply device and system, the power frequency transformer among the prior art has been abandoned, change into and adopt the volume and the size far less than power frequency transformer's high frequency isolation converter, it adopts power frequency transformer to have solved current single-phase safety power supply, there is bulky and big technical problem of weight, power frequency transformer dependence relay has still been solved simultaneously and has been carried out the short circuit protection action, the slow problem of action, the advantage of high frequency short circuit protection has been embodied, carry out quick protection at the microsecond level, the reliability of high frequency short circuit has been promoted greatly simultaneously, can reach 1000 or higher short circuit and not bad in theory.
Description
Technical Field
The application relates to the technical field of safety power supplies, in particular to a high-frequency single-phase safety power supply device and system.
Background
With the rapid development of electronic technology, electronic products tend to be miniaturized and lightened, and enter the lives of people in a large explosion form, particularly power supply products.
The existing single-phase safety power supply device adopts a power frequency transformer to carry out electric energy conversion in the electric energy conversion processing process, so that the single-phase safety power supply device has the problems of large volume and heavy weight, and is not suitable for the development requirements of miniaturization and light weight of a safety power supply, therefore, how to design the miniaturized and light single-phase safety power supply is a technical problem to be solved urgently by technical personnel in the field.
Disclosure of Invention
The application provides a single-phase safe power supply unit of high frequency and system for solve current single-phase safe power supply and adopt power frequency transformer, have bulky and the big technical problem of weight.
In view of the above, a first aspect of the present application provides a high-frequency single-phase safety power supply apparatus, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation on the single-phase alternating current output by the input switch circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load.
Preferably, the high-frequency isolation AC/AC conversion circuit includes a first high-frequency isolation AC/AC conversion circuit;
the first high-frequency isolation AC/AC conversion circuit includes: the device comprises an AC/AC cycle conversion front-stage circuit, an AC/AC high-frequency isolation converter isolation circuit and an AC/AC cycle conversion rear-stage circuit;
the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit are sequentially connected.
Preferably, the high-frequency isolated AC/AC conversion circuit includes a second high-frequency isolated AC/AC conversion circuit;
the second high-frequency isolation AC/AC conversion circuit includes: the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectifying circuit and the DCAC inverter circuit;
the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectifying circuit and the DCAC inverter circuit are connected in sequence.
Preferably, the high frequency isolated AC/AC conversion circuit includes a third high frequency isolated AC/AC conversion circuit;
the third high frequency isolated AC/AC conversion circuit includes: the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit;
the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit are connected in sequence.
Preferably, the high-frequency isolated AC/AC conversion circuit includes a fourth high-frequency isolated AC/AC conversion circuit;
the fourth high-frequency isolated AC/AC conversion circuit includes: the ACDC rectifier circuit, the DC/DC high-frequency isolation converter isolation circuit and the DCAC inverter circuit;
the ACDC rectifying circuit, the DC/DC high-frequency isolation converter isolating circuit and the DCAC inverter circuit are connected in sequence.
Preferably, the AC/AC cycle conversion pre-stage circuit or the AC/AC cycle conversion post-stage circuit includes a bridgeless PFC circuit.
Preferably, the input switching circuit comprises a first EMI circuit and a lightning protection circuit;
the first EMI circuit is connected with the lightning protection circuit;
the output switching circuit comprises a second EMI circuit;
the second EMI filter circuit is used for carrying out EMI filtering processing on the internal single-phase alternating current before the internal single-phase alternating current is output by the output switch circuit.
Preferably, the method further comprises the following steps: the device comprises an auxiliary power circuit, a communication circuit, a commercial power channel switching circuit and a control circuit;
the auxiliary power supply circuit is used for providing auxiliary power supply for the input switch circuit, the output switch circuit, the high-frequency isolation AC/AC conversion circuit, the communication circuit and the commercial power channel switching circuit;
the auxiliary power supply is connected with the control circuit through the communication circuit;
the control circuit is connected with the high-frequency isolation AC/AC conversion circuit;
the control circuit comprises a safe power utilization detection circuit and a short-circuit protection circuit and is used for giving an alarm, performing power-off protection and performing fire protection when power utilization is detected to be unsafe;
the control circuit is further configured to switch the external single-phase alternating current to the commercial power path switching circuit when overload is detected or the high-frequency isolation AC/AC conversion circuit works abnormally, and supply power to the load through the commercial power path switching circuit.
Preferably, the short-circuit protection circuit includes: the device comprises a power conversion circuit, an isolation type driving circuit, a VCE voltage detection circuit, a high-speed optical coupling isolation transmission circuit and a level comparison circuit;
the power conversion circuit comprises a PFC inductor or an energy storage inductor;
the isolated driving circuit and the VCE voltage detection circuit are connected with the power conversion circuit;
the high-speed optical coupling isolation transmission circuit is connected with the isolation type driving circuit and the level comparison circuit;
and the level comparison circuit is connected with the high-speed optical coupling isolation transmission circuit and the VCE voltage detection circuit.
A second aspect of the present application provides a high-frequency single-phase safety power supply system, which includes a first switch switching circuit, a second switch switching circuit, and the high-frequency single-phase safety power supply apparatus of any one of the first aspect;
the high-frequency isolation AC/AC conversion circuit of the high-frequency single-phase safety power supply device includes at least two combinations of the first high-frequency isolation AC/AC conversion circuit, the second high-frequency isolation AC/AC conversion circuit, the third high-frequency isolation AC/AC conversion circuit, and the fourth high-frequency isolation AC/AC conversion circuit according to the first aspect;
the first switch switching circuit is connected with an input switch circuit of the high-frequency single-phase safety power supply device and the high-frequency isolation AC/AC conversion circuit;
the second switch switching circuit is connected with an output switch circuit of the high-frequency single-phase safety power supply device and the high-frequency isolation AC/AC conversion circuit.
According to the technical scheme, the method has the following advantages:
the application provides a single-phase safe power supply unit of high frequency includes: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit; the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence; the input switch circuit is used for inputting external single-phase alternating current; the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current; the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load. The high-frequency single-phase safety power supply device provided in the application abandons a power frequency transformer in the prior art, changes the high-frequency isolation converter into a high-frequency isolation converter with the size far smaller than the power frequency transformer, and solves the technical problems that the existing single-phase safety power supply adopts the power frequency transformer and is large in size and weight.
Simultaneously, the single-phase safe power supply unit of high frequency that this application provided still possesses following beneficial effect:
the electric energy conversion efficiency of the power frequency transformer can only reach 80%, the energy loss is large, the electric energy conversion efficiency of the high-frequency isolation converter can reach more than 90%, compared with the power frequency transformer, the efficiency is improved by more than 10%, the energy loss is far smaller than that of the power frequency transformer, and a large amount of electric energy is saved;
the high-frequency isolation converter is adopted to enable the high-frequency single-phase safety power supply device to work in a high-frequency state, the working frequency is higher than 20kHz and far higher than the sound frequency which can be heard by human ears, the environmental noise is reduced, and the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed 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 only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a high-frequency single-phase safety power supply device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a first high-frequency isolated AC/AC conversion circuit provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second high-frequency isolated AC/AC conversion circuit provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a third high-frequency isolated AC/AC converting circuit provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a fourth high-frequency isolated AC/AC converting circuit provided in the embodiment of the present application;
fig. 6 is a schematic structural diagram of a bridgeless PFC circuit provided in an embodiment of the present application;
fig. 7 is another schematic structural diagram of a high-frequency single-phase safety power supply device provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of a high-frequency single-phase safety power supply system provided in an embodiment of the present application;
FIG. 9 is a circuit schematic of an auxiliary power supply provided in an embodiment of the present application;
fig. 10 is a schematic structural diagram of a DCAC inverter circuit provided in an embodiment of the present application;
fig. 11 is a schematic structural diagram of an isolation circuit of a DC/DC high-frequency isolation converter provided in an embodiment of the present application;
fig. 12 is a block diagram of a short-circuit protection circuit provided in the embodiment of the present application.
Detailed Description
The embodiment of the application discloses high-frequency single-phase safety power supply device and system for solving the technical problems of large size and heavy weight of the existing single-phase safety power supply adopting a power frequency transformer.
Referring to fig. 1, the present application provides an embodiment of a high-frequency single-phase safety power supply apparatus, which includes: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are sequentially connected;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load.
In the high-frequency single-phase safety power supply device provided in the embodiment of the present application, the input switch circuit is configured to connect an external single-phase alternating current to the high-frequency single-phase safety power supply device, and transmit the external single-phase alternating current to the high-frequency isolation AC/AC conversion circuit, so that the high-frequency isolation AC/AC conversion circuit performs high-frequency voltage transformation on the input single-phase alternating current to obtain an internal single-phase alternating current, and then the internal single-phase alternating current is output to a load outside the high-frequency single-phase safety power supply device through the output switch circuit to supply power to the load.
Under the same condition, the weight and volume of the power frequency transformer and the high-frequency isolation converter are greatly different, and the analysis is as follows:
the AP formula for the transformer is:
wherein AP is the core window area AWAnd the effective sectional area A of the magnetic coreeProduct of P, PTApparent power of the transformer, BWFor the working magnetic flux density, fsFor the operating frequency of the switch, K0Is a window usage coefficient, K, of less than 0fIs the form factor, is the ratio of the effective value to the average value, the form factor of a sine wave4.44, the form factor of the square wave is 4, X is a constant, determined by the core used in the transformer, KjIs the current density proportionality coefficient.
Under the condition of equal power, P can be consideredTLikewise, the core element, K, of the same shape0Like X, K can be considered as K when the output waveform is the samefThe same is true, and the same current density proportionality coefficient K is used for reselectionjCombined according to the formula AP ═ AW×AeIt can be seen that the value of AP is inversely proportional to BWAnd fsWhen choosing magnetic core BWThe higher the value is, the smaller the AP is, the working frequency of the industrial frequency transformer is 50Hz or 60Hz, the working frequency of the high-frequency isolation converter is higher than 20000Hz, the industrial frequency transformer generally adopts silicon steel sheets as magnetic core materials, the magnetic flux density of the silicon steel sheets can reach 0.5T-1.4T, the high-frequency isolation converter generally adopts ferrite or alloy as magnetic core materials, the magnetic flux density is generally 0.7T-1T, BWThe difference of the values is not large, but the working frequencies are different greatly, for example, the difference of the values is 400 times when the high frequency of 20kHz is compared with the low frequency of 50Hz, so that the AP value of the power frequency transformer is much higher than that of the high frequency isolation converter, and the size of the power frequency transformer are far higher than those of the high frequency isolation converter, for example, the single-phase power frequency transformer of 10kVA reaches 40-50 KG, the single-phase high frequency isolation converter of 10kVA only has 2-3 KG, and the size of the single-phase high frequency isolation converter of 10kVA is far smaller than that of the single-phase power frequency transformer of 10 kVA. Therefore, compared with the safety power supply device adopting the power frequency transformer, the high-frequency single-phase safety power supply device adopting the high-frequency isolation converter has the advantages of smaller equipment volume, lighter weight, more convenient installation and small occupied space.
And moreover, the high-frequency isolation converter is adopted, and the iron loss of the power frequency transformer is 3-6 times that of the high-frequency isolation converter under the same power according to a flow waveform coefficient Steinment equation, and the energy conversion loss of the power frequency transformer is far higher than that of the high-frequency isolation converter.
The high-frequency single-phase safety power supply device adopting the high-frequency isolation converter works at high frequency, the working frequency is higher than 20kHz, and the working frequency of the inductance of the high-frequency isolation converter is higher than the sound frequency heard by human ears. The human ear can not hear the noise in the transformer inductance, and the user experience is not influenced. Since 20kHz is the upper limit of acoustic frequencies, no disturbing noise is audible to the human ear above 20 kHz. And the working frequency of the power frequency equipment working below 20kHz is lower than 20kHz, so that the noise in the transformer inductor can be heard by human ears, and the user experience is influenced.
The high-frequency single-phase safety power supply device provided in the embodiment of the application abandons a power frequency transformer in the prior art, changes the high-frequency isolation converter with the volume and the size far smaller than the power frequency transformer into the high-frequency isolation converter, and solves the technical problems that the existing single-phase safety power supply adopts the power frequency transformer and is large in volume and weight.
Simultaneously, the single-phase safe power supply unit of high frequency that this application provided still possesses following beneficial effect:
the electric energy conversion efficiency of the power frequency transformer can only reach 80%, the energy loss is large, the electric energy conversion efficiency of the high-frequency isolation converter can reach more than 90%, compared with the power frequency transformer, the efficiency is improved by more than 10%, the energy loss is far smaller than that of the power frequency transformer, and a large amount of electric energy is saved;
the high-frequency isolation converter is adopted to enable the high-frequency single-phase safety power supply device to work in a high-frequency state, the working frequency is higher than 20kHz and far higher than the sound frequency which can be heard by human ears, the environmental noise is reduced, and the user experience is improved.
For easy understanding, referring to fig. 1 and 2, another embodiment of a high-frequency single-phase safety power supply apparatus is provided, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load;
the high-frequency isolation AC/AC conversion circuit comprises a first high-frequency isolation AC/AC conversion circuit;
the first high-frequency isolation AC/AC conversion circuit includes: the device comprises an AC/AC cycle conversion front-stage circuit, an AC/AC high-frequency isolation converter isolation circuit and an AC/AC cycle conversion rear-stage circuit;
the AC/AC cycle conversion front-stage circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion rear-stage circuit are sequentially connected.
It should be noted that, as a further improvement on the first embodiment, the high-frequency isolation AC/AC conversion circuit in the embodiment of the present application includes a first high-frequency isolation AC/AC conversion circuit composed of an AC/AC cycle conversion pre-stage circuit, an AC/AC high-frequency isolation converter isolation circuit, and an AC/AC cycle conversion post-stage circuit, and as shown in fig. 2, the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, and the AC/AC cycle conversion post-stage circuit are connected in sequence. The first high-frequency isolation AC/AC conversion circuit is used for carrying out single-phase cycle conversion on the internal single-phase alternating current output by the input switch circuit, and the commercial power with fixed frequency and amplitude is directly converted into high-frequency alternating current with variable frequency and amplitude, so that the conversion efficiency is high, reversible operation is easy to realize, and the frequency and the amplitude are controllable.
For easy understanding, referring to fig. 1 and 3, another embodiment of a high-frequency single-phase safety power supply apparatus is provided, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load;
the high-frequency isolation AC/AC conversion circuit comprises a second high-frequency isolation AC/AC conversion circuit;
the second high-frequency isolation AC/AC conversion circuit includes: the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectifying circuit and the DCAC inverter circuit;
the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectification circuit and the DCAC inverter circuit are sequentially connected.
It should be noted that, as a further improvement on the first embodiment, the high-frequency isolation AC/AC conversion circuit in the embodiment of the present application includes a second high-frequency isolation AC/AC conversion circuit composed of an AC/AC cycloconversion pre-stage circuit, an AC/AC high-frequency isolation converter isolation circuit, an ACDC rectification circuit, and a DCAC inversion circuit, as shown in fig. 3, the AC/AC cycloconversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectification circuit, and the DCAC inversion circuit are connected in sequence. The internal single-phase alternating current output by the input switch circuit is subjected to single-phase cycle conversion through the AC/AC cycle conversion pre-stage circuit, the commercial power with fixed frequency and amplitude is directly converted into alternating current with variable frequency and amplitude, the AC/AC high-frequency isolation converter isolation circuit is subjected to high-frequency boosting isolation, then is rectified through the ACDC rectification circuit, and the high-frequency alternating current is output through the DCAC inverter circuit. The DCAC inverter circuit can adopt a full-bridge or half-bridge circuit, the frequency exceeds 20kHz, even reaches 150kHz or higher working frequency, and the volume of devices such as inductors, capacitors and the like is reduced while the efficiency and the power are high, so that the rest volume and the weight of the whole machine are greatly reduced, and the power density of the whole machine is improved. Further, as shown in fig. 10, the DCAC inverter circuit in the embodiment of the present application may be a sinusoidal inverter circuit, and the sinusoidal inverter circuit has smaller switching loss than a non-sinusoidal inverter circuit, and is suitable for a high-frequency circuit.
For easy understanding, referring to fig. 1 and 4, another embodiment of a high-frequency single-phase safety power supply apparatus is provided, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load;
the high-frequency isolation AC/AC conversion circuit comprises a third high-frequency isolation AC/AC conversion circuit;
the third high frequency isolation AC/AC conversion circuit includes: the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit;
the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit are sequentially connected.
It should be noted that, in the embodiment of the present application, the ACDC rectifier circuit serving as the single-phase rectifier circuit may be a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge rectifier circuit or a PFC circuit, and preferably a bridgeless PFC circuit, where the bridgeless PFC circuit is shown in fig. 6, and includes a rectifying and filtering inductor L1, a rectifying diode, a rectifying and filtering capacitor C1 and an IGBT, and the on and off of the IGBT is controllably adjusted in a PWM manner, so that the ACDC rectifier circuit is more efficient, and meets the advantages of green, energy saving, small size and light weight of high-frequency safety electric devices.
For easy understanding, referring to fig. 1 and 5, the present application provides another embodiment of a high-frequency single-phase safety power supply apparatus, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load;
the high-frequency isolation AC/AC conversion circuit comprises a fourth high-frequency isolation AC/AC conversion circuit;
the fourth high-frequency isolation AC/AC conversion circuit includes: the ACDC rectifier circuit, the DC/DC high-frequency isolation converter isolation circuit and the DCAC inverter circuit;
the ACDC rectifying circuit, the DC/DC high-frequency isolation converter isolation circuit and the DCAC inverter circuit are connected in sequence.
The ACDC rectifier circuit rectifies external single-phase alternating current into low-frequency pulse current, the low-frequency pulse current flows through the DC/DC high-frequency isolation converter isolation circuit to convert the low-frequency pulse current into high-frequency pulse current, and the high-frequency pulse current forms high-frequency alternating current through the DC/AC inverter circuit. As shown in fig. 11, the isolation circuit of the DC/DC high-frequency isolation converter in the embodiment of the present application is preferably controlled by using a soft switching technology, and has a frequency exceeding 20kHz, even reaching a working frequency of 150kHz or higher, and has extremely high efficiency and large power, and at the same time, reduces the size of devices such as a transformer, an inductor, a capacitor, and the like, thereby greatly reducing the rest and weight of the whole machine, and improving the power density of the whole machine. The ACDC rectifying circuit as the single-phase rectifying circuit may be a half-wave rectifying circuit, a full-wave rectifying circuit, a bridge rectifying circuit or a PFC circuit, preferably a bridgeless PFC circuit, as shown in fig. 6, which includes a rectifying and filtering inductor L1, a rectifying diode, a rectifying and filtering capacitor C1 and an IGBT, and the on and off of the IGBT is controllably adjusted in a PWM manner, so that the ACDC rectifying circuit is more efficient, and meets the requirements of green, energy-saving, small size and light weight of high-frequency safety electric equipment.
For easy understanding, referring to fig. 1 and 7, another embodiment of a high-frequency single-phase safety power supply apparatus is provided, including: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation processing on the single-phase alternating current output by the input switching circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load;
the input switch circuit comprises a first EMI circuit and a lightning protection circuit;
the first EMI circuit is connected with the lightning protection circuit;
the output switching circuit includes a second EMI circuit;
the second EMI filter circuit is used for carrying out EMI filtering processing on the internal single-phase alternating current before the internal single-phase alternating current is output by the output switch circuit.
As a further improvement, the high-frequency single-phase safety power supply device in the embodiment of the present application may further include: the device comprises an auxiliary power circuit, a communication circuit, a commercial power channel switching circuit and a control circuit;
the auxiliary power supply circuit is used for providing an auxiliary power supply for the input switch circuit, the output switch circuit, the high-frequency isolation AC/AC conversion circuit, the communication circuit and the commercial power channel switching circuit;
the auxiliary power supply is connected with the control circuit through the communication circuit;
the control circuit is connected with the high-frequency isolation AC/AC conversion circuit;
the control circuit comprises a safe power utilization detection circuit and a protection circuit and is used for giving an alarm, performing power-off protection and performing fire protection when power utilization is detected to be unsafe;
the control circuit is also used for switching external single-phase alternating current to the commercial power path switching circuit when detecting overload or abnormal work of the high-frequency isolation AC/AC conversion circuit, and supplying power to the load through the commercial power path switching circuit.
As a further improvement, the short-circuit protection circuit in the embodiment of the present application includes: the device comprises a power conversion circuit, an isolation type driving circuit, a VCE voltage detection circuit, a high-speed optical coupling isolation transmission circuit and a level comparison circuit;
the power conversion circuit comprises a PFC inductor or an energy storage inductor;
the isolated driving circuit and the VCE voltage detection circuit are connected with the power conversion circuit;
the high-speed optical coupling isolation transmission circuit is connected with the isolation type driving circuit and the level comparison circuit;
the level comparison circuit is connected with the high-speed optical coupling isolation transmission circuit and the VCE voltage detection circuit.
It should be noted that, as shown in fig. 12, the short-circuit protection circuit provided in this embodiment of the present application utilizes the characteristic that the current of the PFC inductor or the energy storage inductor cannot be transient, so as to reasonably set the inductance value, when the circuit is short-circuited, the maximum current of the circuit does not exceed the maximum current that can be borne by the power tube in the isolation circuit of the high-frequency isolation converter in a short time, and then the VCE current of the power tube is detected by using a discrete component, so as to set a reasonable reference level. The short-circuit protection circuit that designs in this application embodiment, preferred can bear the power tube that 1000 very big electric currents are not bad in the microsecond time, can carry out 1000 short circuits, and protection circuit does not receive the damage, has promoted high frequency equipment's reliability greatly, possesses low cost, high reliability.
As a further improvement, the high-frequency single-phase safety power supply device in the embodiment of the present application may further include: a display panel and an indicator light;
the display panel and the indicator light are both connected with the control circuit.
It should be noted that, the input lightning protection circuit in this embodiment of the application is a lightning protection circuit composed of lightning protection devices such as a piezoresistor, a gas discharge tube, and a temperature fuse, the first EMI circuit is an input EMI filter circuit composed of an inductor and a capacitor, the lightning protection circuit can prevent lightning induction, intrusion, counterattack, and damage to the safety electric equipment by a surge generated by opening and closing of a switch of the large-scale equipment of the power grid, and the first EMI circuit can prevent high-frequency interference of the power grid from affecting the safety electric equipment and then affecting personal and property safety of users.
The output filter circuit is a second EMI circuit consisting of an inductor and a capacitor, can prevent the high-frequency clutter of the electric load at the rear end from interfering the safety electric device, also can prevent the high-frequency clutter of the safety electric device from interfering the electric load at the rear end, and improves the electromagnetic compatibility of the machine, thereby improving the working stability of the machine.
The circuit schematic diagram of the auxiliary power supply is shown in fig. 8, the auxiliary power supply comprises a power tube, an isolation transformer, input filtering, output rectifying, a control chip and the like, multi-path output isolated by a high-frequency isolation converter of a quasi-resonant flyback circuit is preferentially adopted, and the auxiliary power supply has the advantages of small size, high efficiency and good stability.
The control circuit comprises a main control chip, a ground impedance detection circuit for inputting voltage and current, outputting voltage and current, a driving control circuit, a zero line and a live wire, and the like, and a protection and alarm circuit for outputting short circuit, overcurrent, overload, machine over-temperature, fan fault, smoke alarm, spark inhibition and the like.
The communication circuit can be in a communication mode such as wired communication and wireless routes (including WIFI and Bluetooth), the communication content comprises condition information such as input and output voltage and current of the machine, zero-fire-line to ground resistance, input and output power, machine temperature, fan operation, safe power utilization, mains supply switching and the like, and the communication circuit further comprises various protection and fault alarm information such as short circuit, overcurrent, overload, machine over-temperature, fan fault, smoke alarm, spark suppression and the like. The information is connected with the mobile phone APP through the network and the cloud platform, so that a user can check the current and historical running conditions of the machine in real time, and can control the running of the machine and set relevant parameters according to needs.
The display screen comprises the functions of displaying power, voltage, current, temperature, working state and the like, and also comprises the functions of operation setting such as state switching, parameter setting and the like, and also has various protection and fault current and historical alarm information such as short circuit, overcurrent, overload, machine overtemperature, fan fault, smoke alarm, spark suppression and the like. The indicator light pair indicates the machine running status and whether there is a fault.
It should be noted that, under normal conditions, the machine works in the safe power utilization mode, and when the commercial power is normal, the load is normal, and the machine is normal, the machine works in the safe power utilization mode. The mains supply input is boosted to the DC/DC high-frequency isolation converter isolation circuit through the first EMI circuit and the bridgeless PFC circuit, then is switched to alternating current through the DCAC inverter circuit, and finally is supplied to a load through the second EMI circuit. When the control circuit detects that the high-frequency single-phase safety voltage circuit is abnormal, such as the conditions of internal faults of a host, overload of a load, overhigh temperature of a machine and the like, the control circuit directly supplies power to the load through the commercial power channel switching circuit by using external single-phase alternating current.
The single-phase safe power supply unit of high frequency that provides in the embodiment of the application is when using, outside single phase circuit's power frequency alternating current gets into the input switch circuit of equipment, then flow through input lightning protection circuit and the first EMI circuit filtering clutter of input and eliminate undulant power frequency alternating current to the influence of equipment, power frequency alternating current after the filter is stable flows through high frequency isolation AC/AC converting circuit and converts the high frequency alternating current, then carry out the filter steady voltage to high frequency alternating current through output EMI, make the current waveform of high frequency alternating current more stable, then through output switch circuit to the comparatively pure stable high frequency alternating current of single phase circuit output to inside. In this in-process, the running state of control circuit real-time supervision equipment, and show monitoring data through display panel, and user's accessible communication module inquiry and adjustment device running state, when equipment goes wrong or need overhaul, accessible display panel and instruction lamp plate send the warning suggestion and cut off outside single phase circuit and equipment through control circuit control commercial power switching circuit, make outside single phase circuit directly be connected with inside single phase circuit, do not influence the use of the last electrical apparatus of internal single phase circuit.
For ease of understanding, please refer to fig. 8, 2 to 5, which also provides an embodiment of a high-frequency single-phase safety power supply system, comprising: a first switch switching circuit, a second switch switching circuit, and at least two combinations of the input switch circuit, the output circuit switch, and the first high-frequency isolated AC/AC converting circuit, the second high-frequency isolated AC/AC converting circuit, the third high-frequency isolated AC/AC converting circuit, and the fourth high-frequency isolated AC/AC converting circuit in the foregoing embodiment of the high-frequency single-phase safety power supply apparatus;
the first switch switching circuit is connected with the input switch circuit of the high-frequency single-phase safety power supply device and the first high-frequency isolation AC/AC conversion circuit, or the second high-frequency isolation AC/AC conversion circuit, or the third high-frequency isolation AC/AC conversion circuit, or the fourth high-frequency isolation AC/AC conversion circuit;
the second switch switching circuit is connected with the output switch circuit of the high-frequency single-phase safety power supply device and the first high-frequency isolation AC/AC conversion circuit, or the second high-frequency isolation AC/AC conversion circuit, or the third high-frequency isolation AC/AC conversion circuit, or the fourth high-frequency isolation AC/AC conversion circuit.
In the high-frequency single-phase safety power supply system provided in the embodiment of the present application, as shown in fig. 8, the first switch switching circuit is used as an input switch of the first high-frequency isolation AC/AC conversion circuit, the second high-frequency isolation AC/AC conversion circuit, the third high-frequency isolation AC/AC conversion circuit, and the fourth high-frequency isolation AC/AC conversion circuit, the first high-frequency isolation AC/AC conversion circuit or the second high-frequency isolation AC/AC conversion circuit or the third high-frequency isolation AC/AC conversion circuit or the fourth high-frequency isolation AC/AC conversion circuit that is turned on by inputting the internal single-phase alternating current output by the input switch circuit to the first switch switching circuit is turned on, and the second switch switching circuit is used as the first high-frequency isolation AC/AC conversion circuit, the second high-frequency isolation AC/AC conversion circuit, the third high-frequency isolation AC/AC conversion circuit, and the fourth high-frequency isolation AC/AC conversion circuit, And the output switch of the fourth high-frequency isolation AC/AC conversion circuit is used for communicating the first high-frequency isolation AC/AC conversion circuit, the second high-frequency isolation AC/AC conversion circuit, the third high-frequency isolation AC/AC conversion circuit or the fourth high-frequency isolation AC/AC conversion circuit with the output drop conversion circuit. Therefore, the high-frequency single-phase safety power supply system provided in the embodiment of the present application integrates the advantages of the high-frequency single-phase safety power supply device in the embodiment of the high-frequency single-phase safety power supply device, and further has a function of selecting a high-frequency isolation AC/AC conversion circuit, when one high-frequency isolation AC/AC conversion circuit cannot normally operate, the high-frequency isolation AC/AC conversion circuit is switched to another high-frequency isolation AC/AC conversion circuit, so that the high-frequency single-phase safety power supply system has high stability and reliability, or the corresponding high-frequency isolation AC/AC conversion circuit is automatically selected to operate according to the actual application needs of a.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A high-frequency single-phase safety power supply device, comprising: the high-frequency isolation AC/AC conversion circuit comprises an input switch circuit, a high-frequency isolation AC/AC conversion circuit and an output switch circuit;
the input switch circuit, the high-frequency isolation AC/AC conversion circuit and the output switch circuit are connected in sequence;
the input switch circuit is used for inputting external single-phase alternating current;
the high-frequency isolation AC/AC conversion circuit is used for carrying out high-frequency transformation on the single-phase alternating current output by the input switch circuit to obtain internal single-phase alternating current;
the output switch circuit is used for outputting the internal single-phase alternating current output by the high-frequency isolation AC/AC conversion circuit to a load.
2. A high-frequency single-phase safety power supply apparatus according to claim 1, wherein said high-frequency isolation AC/AC converting circuit includes a first high-frequency isolation AC/AC converting circuit;
the first high-frequency isolation AC/AC conversion circuit includes: the device comprises an AC/AC cycle conversion front-stage circuit, an AC/AC high-frequency isolation converter isolation circuit and an AC/AC cycle conversion rear-stage circuit;
the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit are sequentially connected.
3. A high-frequency single-phase safety power supply apparatus according to claim 1, wherein said high-frequency isolation AC/AC converting circuit includes a second high-frequency isolation AC/AC converting circuit;
the second high-frequency isolation AC/AC conversion circuit includes: the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectifying circuit and the DCAC inverter circuit;
the AC/AC cycle conversion pre-stage circuit, the AC/AC high-frequency isolation converter isolation circuit, the ACDC rectifying circuit and the DCAC inverter circuit are connected in sequence.
4. A high-frequency single-phase safety power supply apparatus according to claim 1, wherein said high-frequency isolation AC/AC converting circuit includes a third high-frequency isolation AC/AC converting circuit;
the third high frequency isolated AC/AC conversion circuit includes: the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit;
the ACDC rectifying circuit, the DCAC inverter circuit, the AC/AC high-frequency isolation converter isolation circuit and the AC/AC cycle conversion post-stage circuit are connected in sequence.
5. A high-frequency single-phase safety power supply apparatus according to claim 1, wherein said high-frequency isolation AC/AC converting circuit includes a fourth high-frequency isolation AC/AC converting circuit;
the fourth high-frequency isolated AC/AC conversion circuit includes: the ACDC rectifier circuit, the DC/DC high-frequency isolation converter isolation circuit and the DCAC inverter circuit;
the ACDC rectifying circuit, the DC/DC high-frequency isolation converter isolating circuit and the DCAC inverter circuit are connected in sequence.
6. A high-frequency single-phase safety power supply device according to any one of claims 2 to 4, wherein the AC/AC cycle conversion pre-stage circuit or the AC/AC cycle conversion post-stage circuit includes a bridgeless PFC circuit.
7. The high-frequency single-phase safety power supply apparatus according to claim 1, wherein the input switch circuit includes a first EMI circuit and a lightning protection circuit;
the first EMI circuit is connected with the lightning protection circuit;
the output switching circuit comprises a second EMI circuit;
the second EMI filter circuit is used for carrying out EMI filtering processing on the internal single-phase alternating current before the internal single-phase alternating current is output by the output switch circuit.
8. The high-frequency single-phase safety power supply device according to claim 7, further comprising: the device comprises an auxiliary power circuit, a communication circuit, a commercial power channel switching circuit and a control circuit;
the auxiliary power supply circuit is used for providing auxiliary power supply for the input switch circuit, the output switch circuit, the high-frequency isolation AC/AC conversion circuit, the communication circuit and the commercial power channel switching circuit;
the auxiliary power supply is connected with the control circuit through the communication circuit;
the control circuit is connected with the high-frequency isolation AC/AC conversion circuit;
the control circuit comprises a safe power utilization detection circuit and a short-circuit protection circuit and is used for giving an alarm, performing power-off protection and performing fire protection when power utilization is detected to be unsafe;
the control circuit is further configured to switch the external single-phase alternating current to the commercial power path switching circuit when overload is detected or the high-frequency isolation AC/AC conversion circuit works abnormally, and supply power to the load through the commercial power path switching circuit.
9. The high-frequency single-phase safety power supply apparatus according to claim 8, wherein the short-circuit protection circuit comprises: the device comprises a power conversion circuit, an isolation type driving circuit, a VCE voltage detection circuit, a high-speed optical coupling isolation transmission circuit and a level comparison circuit;
the power conversion circuit comprises a PFC inductor or an energy storage inductor;
the isolated driving circuit and the VCE voltage detection circuit are connected with the power conversion circuit;
the high-speed optical coupling isolation transmission circuit is connected with the isolation type driving circuit and the level comparison circuit;
and the level comparison circuit is connected with the high-speed optical coupling isolation transmission circuit and the VCE voltage detection circuit.
10. A high-frequency single-phase safety power supply system comprising a first switch switching circuit, a second switch switching circuit, and the high-frequency single-phase safety power supply device according to any one of claims 1, 7, 8, or 9;
the high-frequency isolation AC/AC conversion circuit of the high-frequency single-phase safety power supply device comprises at least two combinations of the first high-frequency isolation AC/AC conversion circuit in claim 2, the second high-frequency isolation AC/AC conversion circuit in claim 3, the third high-frequency isolation AC/AC conversion circuit in claim 4, and the fourth high-frequency isolation AC/AC conversion circuit in any one of claims 5 or 6;
the first switch switching circuit is connected with an input switch circuit of the high-frequency single-phase safety power supply device and the high-frequency isolation AC/AC conversion circuit;
the second switch switching circuit is connected with an output switch circuit of the high-frequency single-phase safety power supply device and the high-frequency isolation AC/AC conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910838556.0A CN112448590A (en) | 2019-09-05 | 2019-09-05 | High-frequency single-phase safety power supply device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910838556.0A CN112448590A (en) | 2019-09-05 | 2019-09-05 | High-frequency single-phase safety power supply device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300363A (en) * | 2021-07-26 | 2021-08-24 | 湖南一二三智能科技有限公司 | Safe power utilization device |
| CN113541456A (en) * | 2021-09-16 | 2021-10-22 | 华邦创科(惠州市)智能科技有限公司 | Full-voltage high-frequency direct conversion isolated safety power supply |
-
2019
- 2019-09-05 CN CN201910838556.0A patent/CN112448590A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300363A (en) * | 2021-07-26 | 2021-08-24 | 湖南一二三智能科技有限公司 | Safe power utilization device |
| CN113541456A (en) * | 2021-09-16 | 2021-10-22 | 华邦创科(惠州市)智能科技有限公司 | Full-voltage high-frequency direct conversion isolated safety power supply |
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