CN112309769A - Alternating current contactor drive circuit, alternating current contactor and energy storage system - Google Patents
Alternating current contactor drive circuit, alternating current contactor and energy storage system Download PDFInfo
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- CN112309769A CN112309769A CN202011269055.4A CN202011269055A CN112309769A CN 112309769 A CN112309769 A CN 112309769A CN 202011269055 A CN202011269055 A CN 202011269055A CN 112309769 A CN112309769 A CN 112309769A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
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Abstract
The application provides an alternating current contactor driving circuit, an alternating current contactor and an energy storage system, wherein in the alternating current contactor driving circuit, the output end of a voltage input and starting circuit is respectively connected with the voltage input end of a power management circuit and the voltage input end of a flyback transformer; the control circuit is used for providing input voltage for the flyback transformer and starting voltage for the control chip; the output end of the flyback transformer is connected with the input end of the energy storage type output circuit; for converting an input voltage to an output voltage; the control output end of the power management circuit is connected with the control input end of the flyback transformer and used for controlling the magnitude of the output voltage; the power management circuit is used for obtaining voltage from the flyback transformer and supplying the voltage to the control chip; the output end of the energy storage type output circuit is connected with the alternating current contactor, and the stored electric energy is used for driving the alternating current contactor so as to attract the alternating current contactor. The driving circuit can meet the power requirement of the large-scale alternating current contactor at the moment of actuation.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an alternating current contactor driving circuit, an alternating current contactor and an energy storage system.
Background
In a high-Power energy storage System (PCS), a high-Power ac contactor is often used for grid connection, and in the prior art, ac Power is generally rectified and then converted into dc Power to provide a Power supply for the ac contactor, so that the method is complex in implementation process and wastes resources; and the common switch power supply in the current market can not meet the power of hundreds or even thousands of kilowatts required at the moment of actuation of the large AC contactor, thereby causing the actuation failure of the AC contactor.
Disclosure of Invention
In view of the above, the present application is proposed to provide an ac contactor driving circuit, an ac contactor, and an energy storage system that overcome or at least partially solve the above problems.
According to an aspect of the present application, an ac contactor driving circuit is provided, which includes a voltage input and start circuit, a power management circuit, a flyback transformer, and an energy storage output circuit;
the input end of the voltage input and starting circuit can be connected with an external direct-current power supply, and the output end of the voltage input and starting circuit is respectively connected with the voltage input end of the power management circuit and the voltage input end of the flyback transformer; the voltage input and starting circuit is used for providing input voltage for the flyback transformer and providing starting voltage for a control chip of the power management circuit;
the secondary output end of the flyback transformer is connected with the input end of the energy storage type output circuit; the flyback transformer is used for converting input voltage into output voltage;
the control output end of the power management circuit is connected with the control input end of the flyback transformer, and the power management circuit is used for controlling the magnitude of the output voltage;
the voltage input end of the power management circuit is connected with the primary side output end of the flyback transformer so as to obtain electric energy from the flyback transformer and supply the electric energy to the control chip, and the control chip is enabled to keep running;
the output end of the energy storage type output circuit is connected with the alternating current contactor and used for storing the electric energy of the output voltage and driving the alternating current contactor by utilizing the stored electric energy so as to pull the alternating current contactor in.
Optionally, in the ac contactor driving circuit, the energy storage type output circuit includes a first output circuit and a second output circuit, an input end of the energy storage type output circuit includes an input end of the first output circuit and an input end of the second output circuit, and an output end of the energy storage type output circuit includes an output end of the first output circuit and an output end of the second output circuit;
the secondary output end of the flyback transformer comprises a first secondary output end and a second secondary output end, the first secondary output end of the flyback transformer is connected with the input end of the first output circuit of the energy storage type output circuit, and the second secondary output end of the flyback transformer is connected with the input end of the second output circuit of the energy storage type output circuit;
the output end of the first output circuit can be connected with the alternating current contactor, and the first output circuit is used for supplying a first output voltage to the alternating current contactor so as to pull in the alternating current contactor;
the output terminal of the second output circuit is connectable to the load electronics, and the second output circuit is configured to output the second output voltage to the load electronics.
Optionally, the ac contactor driving circuit further includes: a voltage feedback circuit;
the input end of the voltage feedback circuit is connected with the output end of the first output circuit of the energy storage type output circuit, and the output end of the voltage feedback circuit is connected with the feedback voltage input end of the power management circuit; the voltage feedback circuit is used for feeding back the first output voltage to the power management circuit, so that the power management circuit adjusts parameters of the flyback transformer according to a difference value between the first output voltage and a preset output voltage to control the size of the first output voltage, and the first output voltage is consistent with the preset output voltage.
Optionally, in the ac contactor driving circuit, the voltage feedback circuit includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a tenth capacitor, an isolation optocoupler, and a triangular diode;
one end of the ninth resistor and the other end of the tenth resistor are used as input ends of the voltage feedback circuit and are connected to a first output end of the energy storage type output circuit;
one end of the ninth resistor is also connected with one end of the eighth resistor, and the other end of the ninth resistor is respectively connected with one end of the eleventh resistor, one end of the tenth resistor and a middle pin of the triangular diode;
the other end of the tenth resistor is connected with the anode of the triangular diode; the other end of the eleventh resistor is connected with one end of a tenth capacitor;
the other end of the eighth resistor is connected with one end of the seventh resistor and the first input end of the isolating optocoupler respectively;
the other end of the seventh resistor is connected with the second input end of the isolation optocoupler, the other end of the tenth capacitor and the cathode of the triangular diode respectively;
the first output end of the isolation optocoupler is connected with the feedback voltage input end of the power management circuit, and the second output end of the isolation optocoupler is grounded.
Optionally, in the ac contactor driving circuit, the voltage input and start circuit includes: the circuit comprises a first capacitor, a second resistor and an eleventh capacitor;
one end of the first capacitor is respectively connected with the anode of an external power supply, one end of the second resistor and the voltage input end of the flyback transformer; the other end of the first capacitor is connected with the negative electrode of an external power supply and is grounded;
one end of the eleventh capacitor is connected with the other end of the second resistor, and is used as a second output end of the voltage input and starting circuit to be connected with a second voltage input end of the power management circuit;
the other end of the eleventh capacitor is used as a third output end of the voltage input and starting circuit, is connected with a third voltage input end of the power management circuit and is grounded.
Optionally, in the ac contactor driving circuit, the power management circuit includes a switching device driving circuit, a first input terminal and a second input terminal of the switching device driving circuit are respectively used as a second voltage input terminal and a third voltage input terminal of the power management circuit, and are respectively connected to a second output terminal and a third output terminal of the voltage input and start circuit, a third input terminal of the switching device driving circuit is connected to a driving pulse output terminal of the control chip, and an output terminal of the switching device driving circuit is connected to a control input terminal of the flyback transformer;
and the control chip of the power management circuit drives the alternating current contactor driving circuit to operate by controlling the on/off of the switching device driving circuit.
Optionally, in the ac contactor driving circuit, the power management circuit further includes a control chip power supply circuit, an input end of the control chip power supply circuit is connected to a primary output end of the flyback transformer, and an output end of the control chip power supply circuit is connected to a voltage input end of the power management circuit;
the control chip power supply circuit is used for obtaining electric energy from the flyback transformer and supplying the electric energy to the control chip so as to enable the control chip to keep running.
Optionally, in the ac contactor driving circuit, the control chip power supply circuit includes a fifth capacitor, a sixth capacitor, a seventh resistor, and a fourth diode;
one end of a seventh resistor is connected with the anode of the fourth diode and the primary side output end of the flyback transformer respectively, the other end of the seventh resistor is connected with one end of a fifth capacitor, and the other end of the fifth capacitor is connected with the cathode of the fourth diode and one end of a sixth capacitor respectively; the other end of the sixth capacitor is grounded;
the cathode of the fourth diode is also connected with the voltage input end of the control chip; the anode of the fourth diode is also connected with a zero-crossing detection input end of the control chip.
According to another aspect of the present application, an ac contactor is provided, which includes the ac contactor driving circuit described above.
According to yet another aspect of the present application, there is provided an energy storage system comprising the ac contactor described above.
In summary, the application designs a high-power flyback switching power supply driving circuit by utilizing the characteristics of a flyback transformer, and the driving circuit can output kilowatt power, so that the power requirement at the moment of actuation of a large-scale alternating current contactor can be met; on the other hand, the driving circuit can obtain electric energy from the input end of the flyback transformer, the electric energy is automatically supplied to the control chip of the power management circuit of the driving circuit, an additional external power supply is not needed to supply power to the driving circuit, the electric energy cost is obviously saved, the whole structure is simple, and the implementation means is convenient.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 illustrates a schematic diagram of an AC contactor drive circuit according to one embodiment of the present application;
fig. 2 shows a schematic structural diagram of an ac contactor driving circuit according to another embodiment of the present application.
Fig. 3 shows a schematic structural diagram of an energy storage system according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The idea of the application is that: aiming at the current situation that the existing switch driving circuit can not provide hundreds or even thousands of watts of power required by a large-scale alternating current contactor at the moment of attracting, the driving circuit of the high-power alternating current contactor is designed, the driving circuit adopts a high-frequency flyback transformer, and the characteristics and the circuit design of the flyback transformer are utilized, so that the input voltage can be changed in a large range, and the output voltage and the power in a specific range can be output according to the requirement, so that the use requirement can be met.
Fig. 1 shows a schematic structural diagram of an ac contactor driving circuit according to an embodiment of the present application, and as can be seen from fig. 1, the ac contactor driving circuit includes a voltage input and start circuit, a power management circuit, a flyback transformer, and a tank output circuit.
As can be seen from fig. 1, the input end of the voltage input and start-up circuit is used for connecting an external dc power supply, and the output end of the voltage input and start-up circuit is respectively connected to the voltage input end of the power management circuit and the voltage input end of the flyback transformer; the voltage input and starting circuit is used for providing input voltage for the flyback transformer and providing starting voltage for a control chip of the power management circuit.
The external power supply can be a direct-current power supply, and the flyback transformer of the alternating-current contactor driving circuit has the function of converting high-level voltage into low-level voltage, so that the voltage of the input end of the whole driving circuit is high voltage, the specific voltage can be selected according to needs, in some embodiments of the application, the voltage can be 500V-1000V, the output end of the voltage input and starting circuit is connected with the voltage input end of the flyback transformer, in some embodiments of the application, the first output end of the voltage input and starting circuit can be connected with the voltage input end of the flyback transformer, the voltage input end of the flyback transformer can be a first primary coil positioned on the primary side of the flyback transformer, and the voltage input and starting circuit provides input voltage for the flyback transformer.
In some embodiments of the present application, the second output terminal of the voltage input and start-up circuit may be connected to a voltage input terminal of the power management circuit, the voltage input terminal may be marked as a first voltage input terminal of the power management circuit, and the first voltage input terminal may be a VCC pin of a control chip of the power management circuit. The voltage input and start circuit may provide a start voltage for a control chip of the power management circuit, and in some embodiments of the present application, when the input voltage reaches a certain predetermined magnitude, the control chip is started. It should be noted here that the voltage is only used to provide the instantaneous start voltage for the control chip, and cannot provide the long-time operating voltage for the control chip.
The secondary output end of the flyback transformer is connected with the input end of the energy storage type output circuit; the flyback transformer is used for converting input voltage into output voltage; the working principle of the flyback transformer is as follows: when the primary coil of the transformer is just excited by the direct-current pulse voltage, the secondary coil of the transformer does not provide power output for the load, and the power output is provided for the load only after the excitation voltage of the primary coil of the transformer is switched off. The high-power alternating current contactor driving circuit is designed by utilizing the characteristics of a flyback transformer. The flyback transformer can play a role in isolation and energy storage, and wide voltage range input and high-power load driving can be realized through the design of parameters of the flyback transformer.
The control output end of the power management circuit is connected with the control input end of the flyback transformer, and the power management circuit is used for controlling the size of the output voltage. In some embodiments of the present application, a control chip is included in the power management circuit, and the control chip can control the magnitude of the output voltage according to the voltage and power requirements of the external load by controlling the duty ratio of the output waveform signal. As in some embodiments of the present application, the output voltage may be a 180V voltage.
The voltage input end of the power management circuit is connected with the primary side output end of the flyback transformer so as to obtain voltage from the flyback transformer and supply the voltage to the control chip, and the control chip keeps running.
After a control chip of a power management circuit is started, electric energy capable of keeping the control chip in an operating state is needed, and in the present application, a self-powered circuit of the control chip is designed.
The output end of the energy storage type output circuit is connected with the alternating current contactor and used for storing the received output voltage and driving the alternating current contactor by using the stored electric energy so as to pull in the alternating current contactor.
The energy storage type output circuit stores electric energy of output voltage of an output end of the flyback transformer, and in some embodiments of the application, an energy storage capacitor plate can be used for storing constant energy, for example, 180V voltage is stored. The output end of the energy storage type output circuit is connected with the alternating current contactor and can further drive the alternating current contactor by utilizing the stored electric energy so as to pull in the alternating current contactor. The instantaneous output power of the driving circuit in the application can reach thousands of watts, and the requirement for the instantaneous power of the actuation of the large-scale alternating current contactor can be met.
In summary, as can be seen from the ac contactor driving circuit shown in fig. 1, the flyback switching power supply driving circuit is designed, and the driving circuit can output kilowatt power, so that on one hand, the power requirement at the pull-in moment of driving a large ac contactor can be met; on the other hand, the driving circuit can automatically supply power to the control chip without an external power supply, so that the electric energy cost is obviously saved, the whole structure is simple, and the implementation means is convenient.
In some embodiments of the present application, in the ac contactor driving circuit described above, the energy storage type output circuit includes a first output circuit and a second output circuit, the input terminal of the energy storage type output circuit includes the input terminal of the first output circuit and the input terminal of the second output circuit, and the output terminal of the energy storage type output circuit includes the output terminal of the first output circuit and the output terminal of the second output circuit;
the secondary output end of the flyback transformer comprises a first secondary output end and a second secondary output end, the first secondary output end of the flyback transformer is connected with the input end of the first output circuit of the energy storage type output circuit, and the second secondary output end of the flyback transformer is connected with the input end of the second output circuit of the energy storage type output circuit;
the output end of the first output circuit can be connected with the alternating current contactor, and the first output circuit is used for supplying a first output voltage to the alternating current contactor so as to pull in the alternating current contactor;
the output terminal of the second output circuit is connectable to the load electronics, and the second output circuit is configured to output the second output voltage to the load electronics.
Referring to fig. 1 again, the output terminal of the ac contactor driving circuit in the present application, that is, the energy storage type output circuit, includes two circuits, which are a first output circuit and a second output circuit, respectively, the output terminal of the first output circuit is a first output terminal of the energy storage type output circuit, and the output voltage thereof is denoted as a first output voltage, in some embodiments of the present application, the first output voltage is 180V, and the first output voltage is output to the energy storage electronic device, wherein in some embodiments, the energy storage electronic device may be an energy storage capacitor board, and the energy storage electronic device stores the electric energy obtained from the circuit and supplies the electric energy to the ac contactor to drive the ac contactor to pull in.
In some embodiments of the present application, the second output voltage is 24V, and the 24V voltage is a safe voltage, and may be used to drive the driving circuit of the ac contactor to supply power, and may also be used to provide power for other electronic devices in the energy storage system where the ac contactor is located. The second output voltage may be supplied to other electronic devices in the energy storage system where the ac contactor driving circuit is located, and in some embodiments, the second output voltage may be filtered, stabilized, and then output to other electronic devices in the energy storage system.
In some embodiments of the present application, the ac contactor driving circuit further includes: a voltage feedback circuit. The input end of the voltage feedback circuit is connected with the output end of the second output circuit of the energy storage type output circuit, and the output end of the voltage feedback circuit is connected with the feedback voltage input end of the power management circuit; the voltage feedback circuit is used for feeding the second output voltage back to the power management circuit, so that the power management circuit adjusts parameters of the flyback transformer according to the difference value of the second output voltage and the preset output voltage to control the size of the second output voltage, and the second output voltage is consistent with the preset output voltage.
Referring to fig. 1 again, the ac contactor driving circuit of the present embodiment further includes: the input end of the voltage feedback circuit is connected with the output end of a second output circuit of the energy storage type output circuit, the magnitude of a second output voltage output by the energy storage type output circuit is fed back to the power supply management circuit, and the power supply management circuit does not adjust under the condition that the magnitude of the second output voltage is consistent with the magnitude of a preset output voltage; under the condition that the second output voltage is not consistent with the preset output voltage in size, the power management circuit adjusts the parameter of the flyback transformer to control the second output voltage according to the difference value of the second output voltage and the preset output voltage, so that the second output voltage is consistent with the preset output voltage.
Fig. 2 is a schematic structural diagram of an ac contactor driving circuit according to another embodiment of the present application, and this embodiment provides a specific implementation means for implementing the present invention, please refer to fig. 2, in which a flyback dc transformer includes a first primary coil, a second primary coil, a first secondary coil, a second secondary coil, and a third secondary coil.
The homonymous end of the first primary coil is used as the voltage input end of the flyback transformer to be connected with the output end of the voltage input and starting circuit, the synonym end of the first primary coil is used as the control input end of the flyback transformer to be connected with the D end of the field effect tube, and the second primary coil is connected with the input end of the power supply circuit of the control chip.
The homonymous end of the first secondary coil is connected with the homonymous end of the second secondary coil, the homonymous end of the first secondary coil and the homonymous end of the second secondary coil are used as a first secondary side output end of the flyback transformer, and the homonymous end and the heteronymous end of the third secondary coil are used as a second secondary side output end of the flyback transformer and are both connected with the input end of the energy storage type output circuit.
The energy storage type output circuit comprises two circuits which are a first output circuit and a second output circuit respectively. The output end of the first secondary side of the flyback transformer is connected with the input end of the first output circuit, and the output end of the second secondary side of the flyback transformer is connected with the input end of the second output circuit.
The first output circuit comprises electronic devices such as a dummy load, a current-limiting resistor and an energy-storage capacitor plate, the dummy load passes through one end of the first secondary output end of the flyback transformer, one end of the dummy load is connected with the energy-storage capacitor plate through the current-limiting resistor, the other end of the energy-storage capacitor plate is connected with the other end of the dummy load, and the energy-storage capacitor plate is connected with the alternating current contactor.
As shown in fig. 2, the first output circuit specifically includes a second diode D2, a third capacitor C3, a thirteenth resistor R13, a fourteenth resistor R14, and a twelfth capacitor C12.
The anode of the second diode D2 is connected to one end of the first secondary output end of the flyback transformer T1, and the cathode of the second diode D2 is connected to one end of the third capacitor C3 and one end of the thirteenth resistor R13, respectively; the other end of the thirteenth resistor R13 is connected to one end of the fourteenth resistor R14 and one end of the twelfth capacitor C12 respectively; the other end of the twelfth capacitor C12 is connected to the other end of the fourteenth resistor R14, one end of the third capacitor C3, and the other end of the first secondary output end of the flyback transformer T1, respectively, and the twelfth capacitor C12 is further connected to the ac contactor.
The second diode D2 plays a role of filtering, and the third capacitor C3 plays a role of voltage stabilization.
The fourteenth resistor R14 is used as a dummy load for preventing the output voltage of the first output circuit from exceeding the maximum pressure value that the coil can bear in the ac contactor when the second output circuit is under heavy load or full load.
The thirteenth resistor R13 functions as a current limiting resistor and functions to limit current.
The twelfth capacitor C12 is an energy storage capacitor plate, and stores the electric energy output by the flyback transformer T1 and supplies the electric energy to the ac contactor. The twelfth capacitor C12 may also be replaced by a plurality of electrolytic capacitors connected in parallel.
The second output circuit comprises a fifth diode D5 and a seventh capacitor C7, the anode of the fifth diode D5 is connected to the fourth output terminal of the dc transformation voltage, the cathode of the fifth diode D5 is connected to one end of the seventh capacitor C7, the other end of the seventh capacitor C7 is connected to the third output terminal of the flyback transformer T1, and the seventh capacitor C7 can provide voltage for the external load.
Referring to fig. 2, in some embodiments of the present application, the voltage feedback circuit includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a tenth capacitor C10, an isolation optocoupler U1, and a triangular diode U3; one end of the ninth resistor R9 and the other end of the tenth resistor R10 are used as input ends of the voltage feedback circuit and are connected to the second output end of the energy storage type output circuit; one end of the ninth resistor R9 is further connected to one end of the eighth resistor R8, and the other end of the ninth resistor R9 is respectively connected to one end of the eleventh resistor R11, one end of the tenth resistor R10, and a middle pin of the triangular diode U3; the other end of the tenth resistor R10 is connected with the anode of a triangular diode U3; the other end of the eleventh resistor R11 is connected with one end of a tenth capacitor C10; the other end of the eighth resistor R8 is connected with one end of a seventh resistor R7 and a first input end of an isolation optocoupler U1 respectively; the other end of the seventh resistor R7 is connected with the second input end of the isolation optocoupler U1, the other end of the tenth capacitor C10 and the cathode of the triangular diode U3 respectively; a first output end of the isolation optocoupler U1 is connected with a feedback voltage input end of the power management circuit, and a second output end of the isolation optocoupler U1 is grounded.
The feedback voltage input terminal of the power management circuit may be a FB (feedback) pin of the control chip U2, which is generally used to detect or determine the output current or output voltage, for example, the FB pin is connected to an isolation diode and a resistor, the FB pin is connected to the cathode of a diode, the diode is connected in series with the resistor, and the output voltage of the power supply can be adjusted by controlling the voltage at one end of the resistor.
The voltage feedback circuit can feed back the second output voltage of the energy storage type output circuit to the FB pin of the control chip U2, and the control chip U2 can adjust the magnitude of the second output voltage according to the difference between the second output voltage and the preset output voltage, so that the second output voltage and the preset output voltage are consistent.
Referring again to fig. 2, in some embodiments of the present application, in the ac contactor driving circuit, the voltage input and start circuit includes: the circuit comprises a first capacitor C1, a second resistor R2 and an eleventh capacitor C11; one end of a first capacitor C1 is respectively connected with the anode of an external power supply, one end of a second resistor R2 and a first input end of a flyback transformer T1; the other end of the first capacitor C1 is connected with the negative pole of an external power supply and is grounded; one end of an eleventh capacitor C11 is connected with the other end of the second resistor R2, and is used as a second output end of the voltage input and starting circuit to be connected with the input end of the power management circuit; the other end of the eleventh capacitor C11 is used as a third output end of the voltage input and start-up circuit, and is connected to the input end of the power management circuit and grounded.
The first capacitor C1 is connected with the positive and negative electrodes of the external power supply, and plays a role in filtering and stabilizing voltage for the external power supply. The positive terminal of the external power source is also connected to a voltage input terminal of the flyback transformer T1, which may be the dotted terminal of the primary winding on the primary side of the flyback transformer T1.
The external power supply can charge the eleventh capacitor C11 through the second resistor R2, wherein the second resistor R2 can be a super resistor with a megaresistance, and when the voltage of the eleventh capacitor C11 reaches a preset value, the eleventh capacitor C11 can provide a starting voltage for the control chip U2 through a VCC pin of the control chip U2. When the voltage on the eleventh capacitor C11 is smaller than the preset value, the control chip U2 cannot be activated.
Further, the voltage input and start circuit further comprises an overvoltage protection circuit, and the overvoltage protection circuit is used for stopping starting the control chip when the input voltage is overlarge through voltage division. If the preset maximum threshold of the input voltage is 1000V, if the input voltage exceeds the threshold, the control chip may be damaged due to excessive voltage, and at this time, the overvoltage protection circuit can stop the wave generation of the control chip, thereby playing a role in protecting the control chip.
In a specific implementation manner, referring to fig. 2, the overvoltage protection circuit includes a first resistor R1, a twelfth resistor R12; one end of a first resistor R1 is connected with one end of a second resistor R2, and the other end of the first resistor R1 is respectively connected with a FAULT pin of a control chip U2 of the power management circuit and one end of a twelfth resistor R12; the other end of the twelfth resistor R12 is connected to the other end of the eleventh capacitor C11.
Still further, the voltage input and start-up circuit further comprises an absorption protection circuit, and the absorption protection circuit is used for absorbing the peak voltage generated at the pull-in moment of the field effect tube.
In a specific implementation manner, referring to fig. 2, the absorption protection circuit includes a third resistor R3, a second capacitor C2, and a first diode D1; one end of a third resistor R3 is respectively connected with the positive electrode of the direct-current power supply, one end of a second resistor R2, one end of a second capacitor C2 and the voltage input end of the flyback transformer T1, and can be the same-name end of a primary coil positioned on the primary side of the flyback transformer T1, and the other end of the third resistor R3 is respectively connected with the other end of the second capacitor C2 and the negative electrode of a first diode D1; the positive electrode of the first diode D1 is also connected to the voltage input terminal of the flyback transformer T1, which may be the synonym terminal of the primary winding on the primary side of the flyback transformer T1.
In some embodiments of the present application, in the ac contactor driving circuit, the power management circuit includes a switching device driving circuit, a first input terminal and a second input terminal of the switching device driving circuit are respectively used as a second voltage input terminal and a third voltage input terminal of the power management circuit, and are respectively connected to the second output terminal and a third output terminal of the voltage input and start circuit, a third input terminal of the switching device driving circuit is connected to the driving pulse output terminal of the control chip, and an output terminal of the switching device driving circuit is connected to the voltage input terminal of the flyback transformer.
The control chip of the power management circuit drives the alternating current contactor driving circuit to operate by controlling the on/off of the switching device driving circuit.
The switching device driving circuit comprises a switching device, when the switching device is closed, the whole driving circuit is connected, no voltage is output at the output end of the flyback transformer, when the switching device is disconnected, the whole driving circuit is not connected, and voltage is output at the output end of the flyback transformer. The square wave is output by the control chip, the switching device is regularly opened and closed according to a certain period, the square voltage is output by the output end of the flyback transformer, and the required voltage can be output through the filtering of a subsequent output circuit.
Referring to fig. 2, in some embodiments of the present application, the switching device driving circuit includes an NPN transistor Q2, a PNP transistor Q3, a second transformer T2, and an N-channel fet Q1; wherein, the N-channel field effect transistor Q1 is a switching device. The NPN transistor Q2, the PNP transistor Q3, and the second transformer T2 form a push-pull circuit to provide the driving capability of the control chip, and the second transformer T2 can convert the output voltage of the control chip, i.e., the VCC voltage, into a voltage capable of driving the switching device.
The e end of the NPN type triode Q2 is respectively connected with the c end of the PNP type triode Q3 and the homonymous end of the primary coil of the second transformer T2; the end c of the NPN type triode Q2 is used as a first input end of the switching device driving circuit; the end e of the PNP type triode Q3 is used as the second input end of the switching device driving circuit and is connected with the synonym end of the primary coil of the second transformer T2; the b terminal of the NPN type transistor Q2 is connected to the b terminal of the PNP type transistor Q3, which serves as a third input terminal of the switching device driving circuit and is connected to the DRV pin of the control chip U2.
The dotted terminal of the secondary coil of the second transformer T2 is connected to the G terminal of the N-channel fet Q1, and the dotted terminal thereof is connected to the S terminal of the N-channel fet Q1 and the CS pin of the control chip U2, respectively; the D terminal of the N-channel fet Q1 is connected to the control input terminal of the flyback transformer T1, which may be the synonym terminal of the primary winding on the primary side of the flyback transformer T1.
Further, in some embodiments of the present application, the switching device driving circuit further includes an overcurrent protection circuit, which is capable of absorbing an excessive current at the moment of pull-in of the switching device, i.e., the fet. As can be seen from fig. 2, the overcurrent protection circuit includes a sixth resistor R6, one end of the sixth resistor R6 is connected to the S terminal of the fet Q1, the CS pin of the control chip U2, and the synonym terminal of the secondary coil of the second transformer T2, respectively; the other end of the sixth resistor R6 is grounded. The sixth resistor R6 can convert the current into voltage and transmit the voltage to the CS pin of the control chip U2, and when the current is too large, the connection can be disconnected to protect the control chip U2.
In some embodiments of the present application, in the ac contactor driving circuit, the power management circuit further includes a control chip power supply circuit, an input terminal of the control chip power supply circuit is connected to the primary output terminal of the flyback transformer T1, and an output terminal of the control chip power supply circuit is connected to the first voltage input terminal of the power management circuit; the control chip power supply circuit is used for obtaining power from the flyback transformer T1 and supplying the power to the control chip U2 so as to enable the control chip U2 to keep running.
The voltage input and starting circuit can only provide instant starting voltage for the control chip U2, and the electric energy of the continuous operation of the control chip U2 can not be obtained from the voltage input and starting circuit, so that the power supply circuit of the control chip is designed, and the power supply circuit can obtain the electric energy from the flyback transformer to be supplied to the control chip U2 so as to keep the control chip U2 to operate.
Specifically, referring to fig. 2, the control chip power supply circuit includes a fifth capacitor C5, a sixth capacitor C6, a seventh resistor R7, and a fourth diode D4; one end of a seventh resistor R7 is connected to the anode of the fourth diode D4 and the primary output end of the flyback transformer T1, the other end of the seventh resistor R7 is connected to one end of a fifth capacitor R5, and the other end of the fifth capacitor R5 is connected to the cathode of the fourth diode D4 and one end of a sixth capacitor C6; the other end of the sixth capacitor C6 is grounded; the cathode of the fourth diode D4 is also connected to the voltage input terminal of the control chip U2, i.e., the VCC pin of the control chip U2; the anode of the fourth diode D4 is also connected to a zero-crossing detection input of the control chip U2, i.e., the ZCD pin of the control chip U2.
The second primary coil on the primary side of the flyback transformer T1 starts to work when the control chip reaches a starting voltage value, and is transmitted to the control chip U2 through the power supply circuit of the control chip U2 to maintain the operation of the control chip U2. The voltage is transmitted from the cathode of the fourth diode D4 to the VCC pin of the control chip U2, and the voltage value is set by the turns ratio of the transformer.
The anode of the fourth diode D4 is also connected to a zero-crossing detection input terminal of the control chip U2, i.e., a ZCD pin of the control chip U2, and the zero-crossing detection pin (ZCD) is used for zero-current detection of the power supply circuit of the control chip U2. In some embodiments of the present application, an over-power protection circuit is further disposed between the fourth diode D4 and the ZCD pin of the control chip U2, and the over-power protection circuit is used for preventing the actual power of the control chip U2 from being larger than the rated power of the control chip U2.
Referring to fig. 2, in some embodiments of the present application, the over-power protection circuit includes a third diode D3, a fourth resistor R4, a fifth resistor R5, and a fourth capacitor C4; the anode of the third diode D3 is connected to the anode of the fourth diode D4 and one end of the fourth resistor R4 respectively; the cathode of the third diode D3 is connected to the other end of the fourth resistor R4, one end of the fifth resistor R5, one end of the fourth capacitor C4, and the ZCD pin of the control chip U2; the other end of the fifth resistor R5 is connected to the other end of the fourth capacitor C4 and to the GND pin of the control chip U2.
As shown in fig. 2, in some embodiments of the present application, the FB pin of the control chip U2 is further connected to an eighth capacitor R8 and grounded, and the eighth capacitor R8 functions as a voltage regulator. In other embodiments of the present application, the CT pin of the control chip U2 is further connected to the GND of the control chip U2 through a ninth capacitor C9, and the ninth capacitor C9 can adjust the frequency of the control chip by changing the capacitance value.
The work flow of the ac contactor driving circuit shown in fig. 2 is as follows: an external power supply charges an eleventh capacitor C11 through a second resistor R2, when the voltage of the eleventh capacitor C11 reaches a preset value, a control chip U2 is started, the control chip U2 sends out square waves, when the output of the square waves is at a high level, the current is amplified by a push-pull circuit, a field-effect tube Q1 is driven to be in a closed state, and no voltage is output from the output end of a flyback transformer T1; when the square wave output is at a low level, the fet Q1 is driven to an off state, and the output terminal of the flyback transformer T1 outputs a voltage. Meanwhile, the power supply circuit of the control chip U2 obtains power from the flyback transformer T1 to supply power to the control chip U2, so that the control chip U2 operates. The flyback transformer T1 outputs a voltage continuously according to the square wave period, the voltage of the first output circuit is 180V, after filtering, the twelfth capacitor C12 is charged through the thirteenth resistor R13, and the twelfth capacitor C12 is supplied to the ac contactor, so that the ac contactor is closed. The output voltage of the second output circuit is 24V, and the second output circuit can be directly supplied to other electronic devices of the energy storage system where the alternating current contactor is located.
Fig. 3 shows a schematic structural diagram of an energy storage system 300 according to an embodiment of the present application, where the energy storage system 300 includes an ac contactor 310, and an ac contactor driving circuit 320 is included in the ac contactor 310, where the ac contactor driving circuit 320 is any of the ac contactor driving circuits described above. The alternating current contactor driving circuit can convert direct current provided by an external power supply, such as 500-1000V direct current, into low-voltage direct current, such as 180V direct current, and provide the low-voltage direct current for the alternating current contactor so as to meet the power requirement of last kilowatt required in the absorbing and neutralizing moment.
Furthermore, the energy storage system completes grid-connected operation with a power grid, and the purpose of peak clipping and valley filling is achieved.
To sum up, the beneficial effect of this application lies in: by utilizing the characteristics of a flyback transformer, a high-power flyback switching power supply driving circuit is designed, the driving circuit can output kilowatt power, and on one hand, the power requirement at the moment of actuation of a large-scale alternating current contactor can be met; on the other hand, the driving circuit can obtain electric energy from the input end of the flyback transformer, the electric energy is automatically supplied to the control chip of the power management circuit of the driving circuit, an additional external power supply is not needed to supply power to the driving circuit, the electric energy cost is obviously saved, the whole structure is simple, and the implementation means is convenient.
While the foregoing is directed to embodiments of the present application, other modifications and variations of the present application may be devised by those skilled in the art in light of the above teachings. It should be understood by those skilled in the art that the foregoing detailed description is for the purpose of better explaining the present application, and the scope of protection of the present application shall be subject to the scope of protection of the claims.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (10)
1. An alternating current contactor driving circuit is characterized by comprising a voltage input and starting circuit, a power management circuit, a flyback transformer and an energy storage type output circuit;
the input end of the voltage input and starting circuit is used for connecting an external direct-current power supply, and the output end of the voltage input and starting circuit is respectively connected with the voltage input end of the power management circuit and the voltage input end of the flyback transformer; the voltage input and starting circuit is used for providing input voltage for the flyback transformer and providing starting voltage for a control chip of the power management circuit;
the secondary output end of the flyback transformer is connected with the input end of the energy storage type output circuit; the flyback transformer is used for converting the input voltage into an output voltage;
the control output end of the power management circuit is connected with the control input end of the flyback transformer, and the power management circuit is used for controlling the output voltage;
the voltage input end of the power management circuit is connected with the primary side output end of the flyback transformer so as to obtain electric energy from the flyback transformer and supply the electric energy to the control chip, and the control chip is enabled to keep running;
the output end of the energy storage type output circuit is connected with the alternating current contactor, the energy storage type output circuit is used for storing the electric energy of the output voltage and driving the alternating current contactor by utilizing the stored electric energy, so that the alternating current contactor is attracted.
2. The ac contactor drive circuit according to claim 1, wherein the tank output circuit comprises a first output circuit, a second output circuit; the input end of the energy storage type output circuit comprises the input end of the first output circuit and the input end of the second output circuit, and the output end of the energy storage type output circuit comprises the output end of the first output circuit and the output end of the second output circuit;
the secondary output end of the flyback transformer comprises a first secondary output end and a second secondary output end, the first secondary output end of the flyback transformer is connected with the input end of the first output circuit of the energy storage type output circuit, and the second secondary output end of the flyback transformer is connected with the input end of the second output circuit of the energy storage type output circuit;
the first output circuit comprises an energy storage capacitor plate, the energy storage capacitor plate can be connected with the alternating current contactor and is used for storing electric energy of the first output voltage and supplying the stored electric energy to the alternating current contactor so as to pull in the alternating current contactor;
the second output circuit may be connected to the load electronics, the second output circuit for outputting a second output voltage to the load electronics.
3. The ac contactor drive circuit according to claim 2, further comprising: a voltage feedback circuit;
the input end of the voltage feedback circuit is connected with the output end of the second output circuit of the energy storage type output circuit, and the output end of the voltage feedback circuit is connected with the feedback voltage input end of the power supply management circuit; the voltage feedback circuit is used for feeding back a second output voltage to the power management circuit, so that the power management circuit adjusts parameters of the flyback transformer to control the size of the second output voltage according to the difference value of the second output voltage and a preset output voltage, and the second output voltage is consistent with the preset output voltage.
4. The ac contactor driving circuit according to claim 3, wherein the voltage feedback circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a tenth capacitor, an isolation optocoupler, and a triangular diode;
one end of the ninth resistor and the other end of the tenth resistor are used as input ends of the voltage feedback circuit and are connected to a second output end of the energy storage type output circuit;
one end of the ninth resistor is further connected with one end of the eighth resistor, and the other end of the ninth resistor is respectively connected with one end of the eleventh resistor, one end of the tenth resistor and a middle pin of the triangular diode;
the other end of the tenth resistor is connected with the anode of the triangular diode; the other end of the eleventh resistor is connected with one end of the tenth capacitor;
the other end of the eighth resistor is connected with one end of the seventh resistor and the first input end of the isolation optocoupler respectively;
the other end of the seventh resistor is connected with a second input end of the isolation optocoupler, the other end of the tenth capacitor and a cathode of the triangular diode respectively;
the first output end of the isolation optocoupler is connected with the feedback voltage input end of the power management circuit, and the second output end of the isolation optocoupler is grounded.
5. The ac contactor drive circuit as claimed in claim 1, wherein said voltage input and start circuit comprises: the circuit comprises a first capacitor, a second resistor and an eleventh capacitor;
one end of the first capacitor is respectively connected with the anode of the external power supply, one end of the second resistor and the voltage input end of the flyback transformer; the other end of the first capacitor is connected with the negative electrode of the external power supply and is grounded;
one end of the eleventh capacitor is connected with the other end of the second resistor, and is used as a second output end of the voltage input and starting circuit to be connected with a second voltage input end of the power management circuit;
the other end of the eleventh capacitor is used as a third output end of the voltage input and starting circuit, is connected with a third voltage input end of the power management circuit and is grounded.
6. The ac contactor driving circuit according to claim 1, wherein the power management circuit comprises a switching device driving circuit, a first input terminal and a second input terminal of the switching device driving circuit are respectively used as a second voltage input terminal and a third voltage input terminal of the power management circuit, and are respectively connected to a second output terminal and a third output terminal of the voltage input and start circuit, a third input terminal of the switching device driving circuit is connected to the driving pulse output terminal of the control chip, and an output terminal of the switching device driving circuit is connected to the control input terminal of the flyback transformer;
and the control chip of the power management circuit controls the on/off of the switching device driving circuit so as to drive the alternating current contactor driving circuit to operate.
7. The ac contactor driving circuit according to claim 1, wherein the power management circuit further comprises a control chip power supply circuit, an input terminal of the control chip power supply circuit is connected to the primary output terminal of the flyback transformer, and an output terminal of the control chip power supply circuit is connected to the voltage input terminal of the power management circuit;
the control chip power supply circuit is used for obtaining electric energy from the flyback transformer and supplying the electric energy to the control chip so as to enable the control chip to keep running.
8. The ac contactor driving circuit according to claim 7, wherein the control chip power supply circuit comprises a fifth capacitor, a sixth capacitor, a seventh resistor, and a fourth diode;
one end of the seventh resistor is connected with the anode of a fourth diode and the primary side output end of the flyback transformer respectively, the other end of the seventh resistor is connected with one end of the fifth capacitor, and the other end of the fifth capacitor is connected with the cathode of the fourth diode and one end of the sixth capacitor respectively; the other end of the sixth capacitor is connected with the ground;
the cathode of the fourth diode is also connected with the voltage input end of the control chip; the anode of the fourth diode is also connected with the zero crossing detection input end of the control chip.
9. An ac contactor comprising an ac contactor drive circuit as claimed in any one of claims 1 to 8.
10. An energy storage system, characterized in that the energy storage system comprises the ac contactor as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011269055.4A CN112309769A (en) | 2020-11-13 | 2020-11-13 | Alternating current contactor drive circuit, alternating current contactor and energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011269055.4A CN112309769A (en) | 2020-11-13 | 2020-11-13 | Alternating current contactor drive circuit, alternating current contactor and energy storage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112309769A true CN112309769A (en) | 2021-02-02 |
Family
ID=74336073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011269055.4A Withdrawn CN112309769A (en) | 2020-11-13 | 2020-11-13 | Alternating current contactor drive circuit, alternating current contactor and energy storage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112309769A (en) |
-
2020
- 2020-11-13 CN CN202011269055.4A patent/CN112309769A/en not_active Withdrawn
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Application publication date: 20210202 |