CN112350594A - Switching circuit, power supply equipment and electrical equipment - Google Patents
Switching circuit, power supply equipment and electrical equipment Download PDFInfo
- Publication number
- CN112350594A CN112350594A CN202011129776.5A CN202011129776A CN112350594A CN 112350594 A CN112350594 A CN 112350594A CN 202011129776 A CN202011129776 A CN 202011129776A CN 112350594 A CN112350594 A CN 112350594A
- Authority
- CN
- China
- Prior art keywords
- circuit
- alternating current
- voltage
- power supply
- current side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/25—Conversion of ac power input into dc 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 arranged for operation in series, e.g. for multiplication of voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
Abstract
The application relates to a switching circuit, power supply equipment and electrical equipment. The switching circuit comprises a controlled switching component, a control component, a rectifying circuit and a voltage stabilizing circuit. The first alternating current side of the rectifying circuit is connected with a first interface of an alternating current power supply through a controlled switch assembly, and the second alternating current side of the rectifying circuit is connected with a second interface of the alternating current power supply; the control assembly is connected with the controlled switch assembly and the first alternating current side and the second alternating current side of the rectifying circuit; the direct current side of the rectification circuit is connected with a voltage stabilizing circuit; the voltage stabilizing circuit is used for connecting a load. When the voltage of the alternating current side of the rectifying circuit is smaller than a critical value, the control component controls the controlled switch component to be closed, an alternating current power supply is connected to the alternating current side of the rectifying circuit, and the alternating current power supply directly supplies power to a load; when the voltage of the alternating current side of the rectifying circuit is larger than or equal to a preset critical value, the controlled switch assembly is controlled to be switched off, the alternating current power supply stops supplying power, and the electric quantity stored by the voltage stabilizing circuit supplies power to the load. The switching circuit can improve the utilization rate of energy.
Description
Technical Field
The application relates to the technical field of automation, in particular to a switching circuit, power supply equipment and electrical equipment.
Background
With the rapid development of science and technology, more and more automation technologies are applied to the power grid. The distribution network equipment is usually used for accurate measurement and high-speed wave recording of line current, so that rapid fault location is realized, the response and processing time of faults is shortened, and the power supply reliability is improved. To increase the service life, these distribution network devices need to use external power to reduce the consumption of their own backup power.
According to the traditional power supply circuit of the distribution network equipment, the mutual inductor is used for obtaining energy from a power line, and redundant energy is discharged by using the power resistor after rectification, so that waste of electric energy can be caused. Therefore, the traditional power supply circuit of the distribution network equipment has the defect of low energy utilization rate.
Disclosure of Invention
In view of the above, it is necessary to provide a switching circuit, a power supply apparatus, and an electric apparatus with high energy efficiency.
In a first aspect of the present application, a switching circuit is provided, which includes a controlled switching component, a control component, a rectifying circuit and a voltage stabilizing circuit;
the first alternating current side of the rectifying circuit is connected with a first interface of an alternating current power supply through the controlled switch assembly, and the second alternating current side of the rectifying circuit is connected with a second interface of the alternating current power supply;
the control assembly is connected with the controlled switch assembly and a first alternating current side and a second alternating current side of the rectifying circuit;
the direct current side of the rectification circuit is connected with the voltage stabilizing circuit;
the voltage stabilizing circuit is used for connecting a load;
when the voltage of the alternating current side of the rectifying circuit is greater than or equal to a preset critical value, the control assembly controls the controlled switch assembly to be switched off; when the alternating-current side voltage of the rectifying circuit is smaller than the critical value, the controlled switch component is controlled to be closed; the controlled switch assembly is used for connecting the alternating current power supply to the alternating current side of the rectifying circuit when the controlled switch assembly is closed; and the voltage stabilizing circuit stores energy according to the direct current output by the direct current side of the rectifying circuit.
In one embodiment, the controlled switch assembly includes a normally closed optocoupler;
the emitting part of the normally closed optocoupler is connected with the control component; one end of the receiving part of the normally closed optocoupler is connected with a first interface of the alternating current power supply, and the other end of the receiving part of the normally closed optocoupler is connected with a first alternating current side of the rectifying circuit.
In one embodiment, the normally closed optocoupler is a bidirectional normally closed optocoupler.
In one embodiment, the control assembly comprises a rectifier bridge and a voltage regulator tube;
the alternating current side of the rectifier bridge is connected with the alternating current side of the rectifier circuit; the output positive electrode of the rectifier bridge is connected with the cathode of the voltage stabilizing tube; the output negative electrode of the rectifier bridge is connected with the output end of the emitting part of the normally closed optocoupler; and the anode of the voltage-stabilizing tube is connected with the input end of the emitting part of the normally-closed optocoupler.
In one embodiment, the rectifier bridge is a full bridge rectifier bridge.
In one embodiment, the controlled switch assembly includes a normally closed contactor;
the coil of the normally closed contactor is connected with the control assembly; one end of a normally closed contact of the normally closed contactor is connected with a first interface of the alternating current power supply, and the other end of the normally closed contact is connected with a first alternating current side of the rectifying circuit.
In one embodiment, the rectifier circuit is a full-bridge rectifier circuit, a half-bridge rectifier circuit or a voltage doubling rectifier circuit.
In one embodiment, the voltage regulator circuit is a linear regulator or a DC converter.
In one embodiment, the voltage stabilizing circuit comprises an energy storage component and a voltage stabilizing component;
the energy storage assembly is connected with the direct current side of the rectifying circuit and the voltage stabilizing assembly; the voltage stabilizing component is used for connecting the load.
In a second aspect, there is provided a power supply apparatus comprising any of the above switching circuits.
In a third aspect, an electrical apparatus is provided, which includes a load and the above power supply apparatus.
The switch circuit comprises a controlled switch assembly, a control assembly, a rectifying circuit and a voltage stabilizing circuit. The first alternating current side of the rectifying circuit is connected with a first interface of an alternating current power supply through a controlled switch assembly, and the second alternating current side of the rectifying circuit is connected with a second interface of the alternating current power supply; the control assembly is connected with the controlled switch assembly and the first alternating current side and the second alternating current side of the rectifying circuit; the direct current side of the rectification circuit is connected with a voltage stabilizing circuit; the voltage stabilizing circuit is used for connecting a load. When the voltage of the alternating current side of the rectifying circuit is smaller than a critical value, the control component controls the controlled switch component to be closed, an alternating current power supply is connected to the alternating current side of the rectifying circuit, and the alternating current power supply directly supplies power to a load; when the voltage of the alternating current side of the rectifying circuit is larger than or equal to a preset critical value, the controlled switch assembly is controlled to be switched off, the alternating current power supply stops supplying power, and the power stored by the voltage stabilizing circuit can supply power to the load. Because the direct current side voltage of the rectifying circuit has a clamping function on the alternating current side voltage, and the direct current side voltage of the rectifying circuit is influenced by the size of the load, the control assembly can control the opening and closing of the controlled switch assembly according to the size of the load, the energy taking size is adjusted, the stability of load power supply can be kept, and the utilization rate of energy is improved.
Drawings
FIG. 1 is a block diagram of the components of a switching circuit in one embodiment;
FIG. 2 is a schematic diagram of the structure of the controlled switch assembly and the control assembly in one embodiment;
FIG. 3 is a block diagram of a voltage regulator circuit in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
The application provides a switch circuit, can be used for distribution network equipment's supply circuit among the power electric wire netting, also can be used for other electrical equipment's supply circuit. Referring to fig. 1, the switching circuit includes a controlled switching component 10, a control component 20, a rectifying circuit 30 and a voltage stabilizing circuit 40. Wherein, the first ac side of the rectification circuit 30 is connected to the first interface JP1 of the ac power supply through the controlled switch assembly 10, and the second ac side of the rectification circuit 30 is connected to the second interface JP2 of the ac power supply; the control component 20 is connected with the controlled switch component 10 and the first alternating current side and the second alternating current side of the rectifying circuit 30; the direct current side of the rectification circuit 30 is connected with a voltage stabilizing circuit 40; the regulating circuit 40 is used to connect a load. When the voltage of the alternating current side of the rectifying circuit 30 is greater than or equal to a preset critical value, the control component 20 controls the controlled switch component 10 to be switched off; and controlling the controlled switch assembly 10 to close when the alternating-current side voltage of the rectifying circuit 30 is less than the critical value. The controlled switch assembly 10 is used for connecting an alternating current power supply to an alternating current side of the rectifying circuit 30 when closed; the voltage stabilizing circuit 40 stores energy according to the dc power output from the dc side of the rectifying circuit 30.
The critical value of the ac side of the rectifier circuit 30 is determined by the specific circuit configuration of the control unit 20. The controlled switch assembly 10 may be an optical coupler, a relay or a contactor, and may also be a temperature controlled switch or a voltage controlled switch, and in short, the present embodiment does not limit the type of the controlled switch assembly. The control assembly 20 is used in conjunction with the controlled switch assembly 10, and the circuit configuration of the control assembly 20 may be determined according to the particular type of controlled switch assembly 10. When the signal output by the control component 20 meets a certain condition, the controlled switch component 10 is controlled to perform an opening and closing action.
The rectifier circuit 30 is a circuit that converts ac power to dc power. The rectifying circuit 30 is composed of rectifying diodes, and the voltage after passing through the rectifying circuit is not an alternating voltage but a unidirectional pulsating direct voltage. Specifically, the rectifier circuit 30 may be a half-wave rectifier circuit, a full-wave rectifier circuit, a bridge rectifier circuit, a voltage doubler rectifier circuit, or the like. In summary, the present embodiment is not limited to the type and specific device configuration of the rectifier circuit 30.
The regulation circuit 40 is a power circuit that can maintain the output voltage substantially constant even when the input grid voltage fluctuates or the load changes. The voltage regulator circuit 40 is classified into various types, which are: a DC voltage stabilizing circuit and an AC voltage stabilizing circuit. The connection method of the voltage stabilizing circuit 40 and the load is divided into: a series voltage regulator circuit and a parallel voltage regulator circuit. The working state of the adjusting pipe is divided into: a linear voltage stabilizing circuit and a switching voltage stabilizing circuit. The circuit type is divided into: a simple voltage stabilizing circuit, a feedback type voltage stabilizing circuit and a voltage stabilizing circuit with an amplifying link. Specifically, the voltage regulator circuit 40 may be any one of the above voltage regulator circuits, and the present embodiment is not limited to the type of the voltage regulator circuit and the specific device configuration. The voltage stabilizing circuit 40 may respectively implement the voltage stabilizing function and the energy storing function through an internal voltage stabilizing device and an internal energy storing device, and the voltage stabilizing circuit 40 may also implement the voltage stabilizing function and the energy storing function through a voltage stabilizing capacitor.
Specifically, when the load connected to the switching circuit starts to operate, the voltage on the ac side of the rectifying circuit 30 is necessarily smaller than the critical value, and the control component 20 controls the controlled switching component 10 to close. At this time, the ac side of the rectifier circuit 30 is directly connected to an ac power supply, and the rectifier circuit 30 converts ac into dc, and then supplies power to a load after energy storage and voltage stabilization processing by the voltage stabilizing circuit 40.
When the voltage on the alternating current side of the rectifying circuit 30 is greater than or equal to the critical value, the control component 20 controls the controlled switch component 10 to be switched off, and the whole switch circuit does not obtain energy from the external alternating current power supply. Since the regulator 40 has a certain energy storage function, the regulator 40 continues to supply power to the load, thereby maintaining the load operation.
When the load uses a part of the electric energy, the electric quantity stored in the voltage stabilizing circuit 40 is reduced, so that the voltage on the dc side of the rectifying circuit 30 is reduced, and the voltage on the ac side of the rectifying circuit 30 is reduced by clamping on the dc side. The ac side voltage of the rectifier circuit 30 reaches a critical value after being reduced to a certain level. When the voltage of the alternating current side of the rectifying circuit 30 is lower than the critical value, the control component 20 controls the controlled switch component 10 to be closed, the alternating current side of the rectifying circuit 30 is connected with the alternating current power supply again, and the switch circuit directly obtains energy from the alternating current power supply, charges the voltage stabilizing circuit and simultaneously supplies power to the load.
The above process is repeated continuously, and the power supply stability of the load can be maintained. Because rectifier circuit direct current side voltage possesses the clamp function to alternating current side voltage, and rectifier circuit direct current side voltage receives the influence of load size, be equivalent to the switching that control assembly can control controlled switch assembly according to load size, the adjustment can the size of getting, is favorable to the utilization ratio of increase energy, also can avoid simultaneously because of getting the circuit problem of generating heat that the energy leads to excessively, is favorable to improving the security, increases the life of load.
In one embodiment, referring to fig. 2, the controlled switch assembly 10 includes a normally closed optical coupler, and a transmitting portion 101 of the normally closed optical coupler is connected to the control assembly 20; one end of the receiving unit 102 of the normally closed optocoupler is connected to the first port JP1 of the ac power supply, and the other end is connected to the first ac side of the rectifier circuit 30.
Specifically, when the load connected to the switching circuit starts to operate, the voltage on the ac side of the rectifying circuit 30 is necessarily smaller than the critical value, and the control module 20 controls the receiving portion 102 of the normally-closed optocoupler to be closed. At this time, the ac side of the rectifier circuit 30 is directly connected to an ac power supply, and the rectifier circuit 30 converts ac into dc, and then supplies power to a load after energy storage and voltage stabilization processing by the voltage stabilizing circuit. When the voltage on the alternating current side of the rectifying circuit 30 is greater than or equal to the critical value, the control component 20 controls the transmitting part 101 of the normally-closed optocoupler to be switched on, at the moment, the normally-closed contact of the receiving part 102 of the normally-closed optocoupler is switched off, the whole switching circuit does not obtain energy from an external alternating current power supply any more, the voltage stabilizing circuit continues to supply power to the load, and the load operation is maintained.
When the load uses a part of the electric energy, the stored electric quantity of the voltage stabilizing circuit is reduced, so that the voltage on the direct current side of the rectifying circuit 30 is reduced, and the voltage on the alternating current side of the rectifying circuit 30 is reduced by clamping on the direct current side. The ac side voltage of the rectifier circuit 30 reaches a critical value after being reduced to a certain level. When the voltage on the alternating current side of the rectifying circuit 30 is lower than the critical value, the control component 20 controls the transmitting part 101 of the normally-closed optocoupler to be switched off, at the moment, the normally-closed contact of the receiving part 102 of the normally-closed optocoupler is closed, the alternating current side of the rectifying circuit 30 is switched on again, and the switching circuit directly obtains energy from the alternating current power supply to supply power to the load.
In the above embodiment, the normally-closed optocoupler is used as the controlled switch component, and the normally-closed optocoupler has the advantages of small size, long service life and strong anti-interference capability, so that the electrical performance of the switch circuit is improved.
In one embodiment, the normally closed optocoupler is a bidirectional normally closed optocoupler.
The receiving part of the bidirectional normally-closed optocoupler comprises a first MOS (metal oxide semiconductor) tube and a second MOS tube which are connected in series. The MOS transistor is a metal-oxide semiconductor field effect transistor, and is a field effect transistor that can be widely used in analog circuits and digital circuits. According to the polarity difference of its working carrier, the MOS transistor can be divided into two types of "N-type" and "P-type", which are also called NMOS transistor and PMOS transistor. In the following, a connection mode and a working process of the bidirectional normally-closed optocoupler are briefly described by taking an example that a transmitting part of the bidirectional normally-closed optocoupler is a light-emitting diode and a receiving part of the bidirectional normally-closed optocoupler is an NMOS tube.
Specifically, referring to fig. 2, the gate of the first NMOS transistor M1 is connected to the gate of the second NMOS transistor M2; the source electrode of the first NMOS transistor M1 is connected with the source electrode of the second NMOS transistor M2; the drain electrode of the first NMOS tube M1 is connected with a first interface of an alternating current power supply; the drain of the second NMOS transistor M2 is connected to the first ac side of the rectifier circuit. When the light emitting diode D1 does not emit light, the first NMOS tube M1 and the second NMOS tube M2 are in a closed state, the first alternating current side of the rectifying circuit is directly connected with a first interface of an alternating current power supply, the rectifying circuit is connected with the alternating current power supply, and the switching circuit directly obtains energy from the alternating current power supply and supplies power to a load; when the light emitting diode D1 emits light, the first NMOS transistor M1 and the second NMOS transistor M2 are turned off, the entire switching circuit no longer obtains energy from the external ac power source, and the voltage stabilizing circuit continues to supply power to the load, thereby maintaining the operation of the load.
In the above embodiment, the normally closed optocoupler is a bidirectional normally closed optocoupler, and the bidirectional normally closed optocoupler has high performance and low cost, so that the cost of the switch circuit can be reduced, and the circuit performance can be improved.
In one embodiment, continuing to refer to fig. 2, the control assembly 20 includes a rectifier bridge 201 and a voltage regulator tube 202. The alternating current side of the rectifier bridge 201 is connected with the alternating current side of the rectifier circuit 30; the output anode of the rectifier bridge 201 is connected with the cathode of the voltage regulator tube 202; the output negative electrode of the rectifier bridge 201 is connected with the output end of the emitting part 101 of the normally closed optocoupler; the anode of the voltage regulator tube 202 is connected with the input end of the emitting part 101 of the normally closed optocoupler.
In combination with the above, the ac side of the rectifier circuit 30 includes a first ac side and a second ac side, and correspondingly, the ac side of the rectifier bridge 201 also includes a first ac side and a second ac side. The ac side of the rectifier bridge 201 is connected to the ac side of the rectifier circuit 30, and means: the first alternating current side of the rectifier bridge 201 is connected with the first alternating current side of the rectifier circuit 30; the second ac side of the rectifier bridge 201 is connected to the second ac side of the rectifier circuit 30.
Specifically, when the voltage on the ac side of the rectifier circuit 30 is less than the critical value, because the ac voltage is low, the voltage output after rectification by the rectifier bridge 201 is not enough to reversely turn on the voltage regulator tube 202, and the emitting portion 101 of the normally-closed optocoupler does not emit light, the normally-closed contact of the receiving portion 102 of the normally-closed optocoupler is closed, the rectifier circuit 30 is connected to an ac power supply, and the switching circuit directly obtains energy from the ac power supply to supply power to the load. When the voltage on the alternating current side of the rectifying circuit 30 is greater than or equal to the critical value, the voltage output after rectification by the rectifier bridge 201 makes the voltage regulator 202 conduct reversely and drives the transmitting part 101 of the normally-closed optocoupler to conduct, so the normally-closed contact of the receiving part 102 of the normally-closed optocoupler is disconnected, the whole switching circuit does not obtain energy from an external alternating current power supply any more, and the voltage stabilizing circuit continues to supply power to the load to maintain the load to run.
In one embodiment, with continued reference to fig. 2, the rectifier bridge 201 is a full bridge rectifier bridge.
As mentioned above, the ac side of the full bridge rectifier is connected to the ac side of the rectifier circuit, and the output anode of the full bridge rectifier is connected to the cathode of the stabilivolt 202; the output negative electrode is connected with the output end of the emitting part 101 of the normally closed optocoupler. Specifically, the full-bridge rectifier includes 4 diodes connected end to end: diode D2, diode D3, diode D4, and diode D5. The anode of the diode D2 is connected to the cathode of the diode D5, the anode of the diode D3 is connected to the cathode of the diode D4, the cathode of the diode D2 is connected to the cathode of the diode D3, and the anode of the diode D4 is connected to the anode of the diode D5. A common connection point of the diode D2 and the diode D5 serves as a first input pole on the ac side, and a common connection point of the diode D3 and the diode D4 serves as a second input pole on the ac side. The common connection point of the diode D2 and the diode D3 serves as an output anode, and the common connection point of the diode D4 and the diode D5 serves as an output cathode.
In the positive half cycle of alternating current input, the diode D2 and the diode D4 are conducted, the diode D3 and the diode D5 are cut off, current enters from the first input pole and flows through the diode D2 to the output positive pole, when the current is enough to enable the voltage regulator 202 to break down in the reverse direction, the current flows through the voltage regulator 202 and the light emitting diode D1 to the output negative pole, and then flows through the diode D4 to the second input pole. In the negative half cycle of the alternating current input, the diode D2 and the diode D4 are cut off, the diode D3 and the diode D5 are conducted, current enters from the second input pole and flows through the diode D3 to reach the output anode, when the current is enough to enable the voltage regulator 202 to break down in the reverse direction, the current flows through the voltage regulator 202 and the light emitting diode D1 to reach the output cathode, and then flows through the diode D5 to reach the first input pole. Thus, the half cycle signal can always be output at the dc voltage output terminal.
In the above embodiment, the control electrical signal is obtained by processing the full-bridge rectifier bridge, which is beneficial to improving the utilization rate of energy.
In one embodiment, the controlled switch assembly includes a normally closed contactor. The coil of the normally closed contactor is connected with a control component. One end of a normally closed contact of the normally closed contactor is connected with a first interface of an alternating current power supply, and the other end of the normally closed contact is connected with a first alternating current side of the rectifying circuit.
Specifically, when the coil of the normally closed contactor is energized, the coil current generates a magnetic field, so that the static iron core generates electromagnetic attraction to attract the movable iron core, and the normally closed contactor is provided for disconnection. When the coil is powered off, the electromagnetic attraction disappears, and the armature is released under the action of the release spring to restore the contact and restore the normally closed state.
In one embodiment, the rectifier circuit is a full bridge rectifier circuit or a half bridge rectifier circuit.
Specifically, the rectifier circuit is divided according to functions, and includes full-wave rectification and half-wave rectification. Full-wave rectification means that in the rectification process, alternating current waveforms are firstly converted into the same polarity and then rectified, namely all input waveforms form output. Half-wave rectification means that during the rectification, one of the positive half cycle or the negative half cycle of the alternating current waveform is eliminated, and only half of the input waveform forms the output. Therefore, the energy utilization rate of full-wave rectification is superior to that of half-wave rectification, and the advantage of half-wave rectification is that the circuit is simple. According to the requirement of the load, the cost, the efficiency and the stability are comprehensively considered, and different types of rectifying circuits can be selected.
It should be noted that both full-bridge and half-bridge rectifier circuits can achieve full-wave rectification. Specifically, a rectifier bridge of a full-bridge rectifier circuit generally includes four diodes, each diode is one arm of a bridge, and is connected end to form a ring, and input and output cannot be interchanged. The rectifier bridge of the half-bridge rectifier circuit only needs to use two diodes, the output ends of the two diodes are connected, and the input ends of the two diodes are respectively connected with the two ends of the transformer.
In one embodiment, the rectifier circuit is a voltage doubler rectifier circuit.
The voltage-multiplying rectifying circuit consists of a diode with higher inverse peak voltage and a capacitor with higher withstand voltage, and the rectifying and guiding functions of the diode are utilized to store the voltage on the respective capacitors respectively, and then the capacitors are connected in series according to the principle of polarity addition to output a high voltage higher than the input voltage. By the rectification function of the voltage doubling rectification circuit, the output voltage higher than the input voltage by integral multiple can be output. The voltage-doubling rectifying circuit is divided into a voltage-doubling rectifying circuit, a voltage-doubling rectifying circuit and a voltage-doubling rectifying circuit according to the output voltage which is multiplied by the input voltage. When the load meets the requirements of low current and high voltage, the voltage-multiplying rectifying circuit can be used for rectifying and then supplying power to the load.
In the above embodiment, different types of rectifier circuits are selected according to the characteristics of the load, which is beneficial to expanding the application scene of the switch circuit.
In one embodiment, the voltage regulator circuit is a linear regulator.
The linear regulator is a voltage regulator circuit that subtracts an excess voltage from an input voltage of a front-end circuit using a transistor or a field effect transistor operating in its linear region to generate a regulated output voltage, and outputs the regulated output voltage to a load. The working principle of the circuit is the same as that of the reverse amplifying circuit. The linear voltage regulator has the outstanding advantages of low cost, low noise and low quiescent current. Its peripheral devices are also few, typically only one or two bypass capacitors. Further, the linear regulator includes a field effect transistor. The linear voltage stabilizer using the field effect transistor can realize better electric appliance performance: on one hand, the field effect transistor does not need to be driven by base current, so that the current of the device is greatly reduced; on the other hand, in the structure using the transistor, in order to prevent the transistor from entering a saturation state to reduce the output capability, a large input/output voltage difference must be ensured, the voltage difference of the field effect transistor is approximately equal to the product of the output current and the on-resistance thereof, and the voltage difference is very low due to the extremely small on-resistance thereof.
In the above embodiment, the linear regulator is used as the voltage stabilizing circuit, and the dc regulator is generally packaged in a small size, which is beneficial to reducing the size of the switching circuit and reducing the cost. In addition, the linear voltage regulator has excellent performance, provides value-added characteristics such as thermal overload protection and safe current limiting, and greatly reduces power consumption in the off mode.
In one embodiment, the voltage regulator circuit is a DC converter.
A dc converter is an electronic device that converts one dc power source into another dc power source having different output characteristics. The DC converter converts the input DC voltage into DC voltage or current meeting the load requirement through controlling the switch tube and then through energy storage filter elements such as a capacitor, an inductor and the like. Dc converters can be classified into basic dc converters without an isolation transformer and dc converters with an isolation transformer according to circuit topology. According to different circuit structures and functions, the converter can be further divided into a buck converter, a boost converter, a buck-boost converter and a Cuk converter. The specific type and circuit configuration of the dc-dc converter in this embodiment are not limited.
In the above embodiment, the dc converter is used to chop the constant dc voltage into a series of pulse voltages by fast on/off control of the device, and the pulse width of the pulse series is changed by controlling the change of the duty ratio to adjust the average value of the output voltage, and then the output voltage is filtered by the output filter to output controllable dc power to the controlled load, which is beneficial to maintaining the stability of the load power supply and prolonging the service life of the load.
In one embodiment, referring to FIG. 3, the regulation circuit 40 includes an energy storage component 401 and a voltage regulation component 402. The energy storage component 401 is connected with the direct current side of the rectifying circuit 30 and the voltage stabilizing component 402; the voltage regulation assembly 402 is used to connect a load.
Specifically, the energy storage assembly may be an energy storage capacitor, an energy storage battery or other electronic components with an energy storage function, and in short, the embodiment does not limit the specific components of the energy storage assembly. When the controlled switch assembly is closed, the external alternating current power supply charges the energy storage assembly while supplying power to the load; when the controlled switch component is switched off, the stored electric quantity is released by the energy storage component, and the voltage is stabilized by the voltage stabilizing component to supply power to the load.
In the embodiment, the energy storage assembly and the voltage stabilizing assembly are arranged in the voltage stabilizing circuit, and when the controlled switch assembly is switched off, the energy storage assembly supplies power to the load, so that the stable operation of the load is maintained, and the stability of the performance of the load is improved.
In one embodiment, there is provided a power supply apparatus comprising the switching circuit of any of the above embodiments.
For the specific definition of the switching circuit, reference is made to the above, and the description thereof is omitted.
Specifically, the power supply device may be a power supply socket, and includes a power supply interface and any of the above-mentioned switching circuits, and a power supply line of a load is connected to the power supply interface and then connected to an ac power supply through the switching circuit. This power supply unit can also be the power box, including plug, box, jack and above-mentioned arbitrary switch circuit, wherein jack and switch circuit set up in the box, and plug, switch circuit and jack once connect, and the plug is used for inserting alternating current power supply, and the jack is used for inserting the load. It will be appreciated that the power box may include a plurality of sets of jacks and correspondingly, a plurality of sets of switching circuits, which may be identical or different, for matching different load requirements. In summary, the present embodiment does not limit the specific type and configuration of the power supply apparatus.
In one embodiment, an electrical apparatus is provided, which includes a load and the above power supply apparatus.
For specific limitations of the power supply device, reference may be made to the above description, which is not repeated herein. The electric equipment can be distribution network equipment and other electric equipment. The load of the electrical equipment is connected with an alternating current power supply through power supply equipment.
Specifically, when a load connected to the power supply device starts to operate, in the power supply device, the voltage on the alternating current side of a rectifying circuit in the switching circuit is necessarily smaller than a critical value, and the control component controls the controlled switching component to be closed. At the moment, the alternating current side of the rectifying circuit is directly connected with an alternating current power supply, and after the rectifying circuit converts alternating current into direct current, the alternating current is subjected to energy storage and voltage stabilization processing through the voltage stabilizing circuit to supply power to the load.
When the alternating-current side voltage of the rectifying circuit is larger than or equal to the critical value, the control assembly controls the controlled switch assembly to be disconnected, and the whole switch circuit does not obtain energy from an external alternating-current power supply. Because the voltage stabilizing circuit comprises the voltage stabilizing capacitor and has a certain energy storage function, the voltage stabilizing circuit continuously supplies power to the load at the moment to maintain the load to operate.
When the load uses part of electric energy, the electric quantity stored by the voltage stabilizing circuit is reduced, so that the voltage of the direct current side of the rectifying circuit is reduced, and the voltage of the alternating current side of the rectifying circuit is reduced by clamping of the direct current side. The ac side voltage of the rectifier circuit is reduced to a certain level and reaches a critical value. When the voltage of the alternating current side of the rectifying circuit is lower than a critical value, the control assembly controls the controlled switch assembly to be closed, the alternating current side of the rectifying circuit is connected with the alternating current power supply again, and the switch circuit directly obtains energy from the alternating current power supply to supply power to the load.
The above process is repeated continuously, and the power supply stability of the load can be maintained. Because among the power supply unit, rectifier circuit direct current side voltage among the switch circuit possesses the clamp function to exchanging side voltage, and rectifier circuit direct current side voltage receives the influence of load size, be equivalent to the switching of control assembly among the switch circuit can be according to load size control controlled switch assembly, the adjustment can the size of getting, is favorable to improving the utilization ratio of energy, also can avoid simultaneously because of getting the circuit problem of generating heat that the energy leads to excessively, is favorable to improving the security, increases the life of load.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A switching circuit is characterized by comprising a controlled switching component, a control component, a rectifying circuit and a voltage stabilizing circuit;
the first alternating current side of the rectifying circuit is connected with a first interface of an alternating current power supply through the controlled switch assembly, and the second alternating current side of the rectifying circuit is connected with a second interface of the alternating current power supply;
the control assembly is connected with the controlled switch assembly and a first alternating current side and a second alternating current side of the rectifying circuit;
the direct current side of the rectification circuit is connected with the voltage stabilizing circuit;
the voltage stabilizing circuit is used for connecting a load;
when the voltage of the alternating current side of the rectifying circuit is greater than or equal to a preset critical value, the control assembly controls the controlled switch assembly to be switched off; when the alternating-current side voltage of the rectifying circuit is smaller than the critical value, the controlled switch component is controlled to be closed; the controlled switch assembly is used for connecting the alternating current power supply to the alternating current side of the rectifying circuit when the controlled switch assembly is closed; and the voltage stabilizing circuit stores energy according to the direct current output by the direct current side of the rectifying circuit.
2. The switching circuit of claim 1, wherein the controlled switching component comprises a normally-off optocoupler;
the emitting part of the normally closed optocoupler is connected with the control component; one end of the receiving part of the normally closed optocoupler is connected with a first interface of the alternating current power supply, and the other end of the receiving part of the normally closed optocoupler is connected with a first alternating current side of the rectifying circuit.
3. The switch circuit of claim 2, wherein the normally closed optocoupler is a bidirectional normally closed optocoupler.
4. The switching circuit according to claim 2, wherein the control component comprises a rectifier bridge and a voltage regulator tube;
the alternating current side of the rectifier bridge is connected with the alternating current side of the rectifier circuit; the output positive electrode of the rectifier bridge is connected with the cathode of the voltage stabilizing tube; the output negative electrode of the rectifier bridge is connected with the output end of the emitting part of the normally closed optocoupler; and the anode of the voltage-stabilizing tube is connected with the input end of the emitting part of the normally-closed optocoupler.
5. The switching circuit of claim 4, wherein the rectifier bridge is a full bridge rectifier bridge.
6. The switching circuit according to claim 1, wherein the controlled switch assembly comprises a normally closed contactor;
the coil of the normally closed contactor is connected with the control assembly; one end of a normally closed contact of the normally closed contactor is connected with a first interface of the alternating current power supply, and the other end of the normally closed contact is connected with a first alternating current side of the rectifying circuit.
7. The switching circuit according to claim 1, wherein the rectifying circuit is a full-bridge rectifying circuit, a half-bridge rectifying circuit, or a voltage-doubler rectifying circuit.
8. The switching circuit of claim 1, wherein the voltage regulation circuit is a linear regulator or a dc converter.
9. A power supply device, characterized in that it comprises a switching circuit according to any one of claims 1-8.
10. An electrical appliance, characterized in that it comprises a load and a power supply device as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011129776.5A CN112350594B (en) | 2020-10-21 | 2020-10-21 | Switching circuit, power supply equipment and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011129776.5A CN112350594B (en) | 2020-10-21 | 2020-10-21 | Switching circuit, power supply equipment and electrical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112350594A true CN112350594A (en) | 2021-02-09 |
| CN112350594B CN112350594B (en) | 2022-07-01 |
Family
ID=74359431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011129776.5A Active CN112350594B (en) | 2020-10-21 | 2020-10-21 | Switching circuit, power supply equipment and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112350594B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093486A1 (en) * | 2022-10-31 | 2024-05-10 | 云南电网有限责任公司电力科学研究院 | Power supply apparatus for power transmission line monitoring device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2733573Y (en) * | 2004-06-15 | 2005-10-12 | 梁武兴 | Anti-flashover AC contactor |
| US20110210712A1 (en) * | 2010-03-01 | 2011-09-01 | Tagare Madhavi V | AC or DC POWER SUPPLY EMPLOYING SAMPLING POWER CIRCUIT |
| CN102291017A (en) * | 2006-07-12 | 2011-12-21 | 电力集成公司 | Method and apparatus for a high voltage power supply circuit |
| CN205622535U (en) * | 2016-05-12 | 2016-10-05 | 湖南工程学院 | Take rectifier of hysteresis comparison function |
| CN109067219A (en) * | 2018-11-06 | 2018-12-21 | 深圳市高益智能电气有限公司 | A kind of three-phase AC/DC conversion device and its control method |
| CN110034536A (en) * | 2019-04-01 | 2019-07-19 | 邓依诺 | A kind of middle school teaching experiment power supply protection system |
| CN211089489U (en) * | 2020-01-06 | 2020-07-24 | 舟山职业技术学校 | Direct-current soft start controller for ship |
-
2020
- 2020-10-21 CN CN202011129776.5A patent/CN112350594B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2733573Y (en) * | 2004-06-15 | 2005-10-12 | 梁武兴 | Anti-flashover AC contactor |
| CN102291017A (en) * | 2006-07-12 | 2011-12-21 | 电力集成公司 | Method and apparatus for a high voltage power supply circuit |
| US20110210712A1 (en) * | 2010-03-01 | 2011-09-01 | Tagare Madhavi V | AC or DC POWER SUPPLY EMPLOYING SAMPLING POWER CIRCUIT |
| CN205622535U (en) * | 2016-05-12 | 2016-10-05 | 湖南工程学院 | Take rectifier of hysteresis comparison function |
| CN109067219A (en) * | 2018-11-06 | 2018-12-21 | 深圳市高益智能电气有限公司 | A kind of three-phase AC/DC conversion device and its control method |
| CN110034536A (en) * | 2019-04-01 | 2019-07-19 | 邓依诺 | A kind of middle school teaching experiment power supply protection system |
| CN211089489U (en) * | 2020-01-06 | 2020-07-24 | 舟山职业技术学校 | Direct-current soft start controller for ship |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024093486A1 (en) * | 2022-10-31 | 2024-05-10 | 云南电网有限责任公司电力科学研究院 | Power supply apparatus for power transmission line monitoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112350594B (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8130524B2 (en) | Bi-directional DC to DC power converter having a neutral terminal | |
| US8193784B2 (en) | Bidirectional DC to DC converter for power storage control in a power scavenging application | |
| CN101414764B (en) | Method and apparatus to reduce the volume required for bulk capacitance in a power supply | |
| US11784552B2 (en) | Power converter and related system | |
| CN109314473A (en) | High-efficiency AC is to DC converter and method | |
| US8502420B1 (en) | Power supply architecture for controlling and monitoring isolated output modules | |
| US10834793B2 (en) | Power supply circuit and LED driving circuit | |
| JP2011101585A (en) | Driver circuit with increased power factor | |
| TW201044763A (en) | Method for lowering power loss and circuit | |
| KR102070095B1 (en) | Light Source Driving Apparatus and Light Emitting Apparatus Including the Same | |
| US20220190638A1 (en) | System to provide AC or DC power to electronic equipment | |
| CN104467437A (en) | Low stand-by power consumption switching power supply | |
| KR20070121827A (en) | Method for operating a switched mode power supply with the recovery of primary scattered energy | |
| CN112350594B (en) | Switching circuit, power supply equipment and electrical equipment | |
| CN214045464U (en) | Switching circuit, power supply equipment and electrical equipment | |
| CN208707312U (en) | A kind of single-fire-wire electronic switch circuit | |
| CN110445117A (en) | Direct current inputs reverse connection prevention protection circuit | |
| CN212463182U (en) | Single live wire switch circuit of intelligence, device and single live wire switch | |
| CN111432523B (en) | BUCK constant current control circuit with input voltage changing along with output voltage and power supply | |
| CN112034239A (en) | Integrated high-voltage line current monitoring and temperature monitoring device | |
| CN109586397B (en) | Power supply control circuit and electronic equipment | |
| WO2022151653A1 (en) | Switching circuit, power supply device, and electrical device | |
| CN104684177B (en) | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment | |
| CN220172915U (en) | Power supply circuit and electronic equipment | |
| CN215733447U (en) | Alternating-current overvoltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |