CN110896211B - Resonant circuit abnormality control circuit, control method and resonant device - Google Patents
Resonant circuit abnormality control circuit, control method and resonant device Download PDFInfo
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- CN110896211B CN110896211B CN201911199061.4A CN201911199061A CN110896211B CN 110896211 B CN110896211 B CN 110896211B CN 201911199061 A CN201911199061 A CN 201911199061A CN 110896211 B CN110896211 B CN 110896211B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention is suitable for the technical field of resonance, and provides a resonant circuit abnormality control circuit, a control method and a resonant device. The resonance circuit abnormality control circuit includes: the device comprises a sampling module, a conditioning module and a controller; the sampling module is connected with the output end of the resonant circuit at the input end, and the output end of the sampling module is connected with the input end of the conditioning module and used for collecting the electrical parameters of the resonant circuit and sending the electrical parameters to the conditioning module; the output end of the conditioning module is connected with the input end of the controller and used for sending a driving abnormal signal to the controller when the electrical parameter exceeds a preset range; and the output end of the controller is connected with the input end of the resonant circuit and is used for stopping sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit when the driving abnormal signal is received. The invention locks the drive at the end time of a switching period, can reduce the voltage stress of the switching tube and effectively prevents the switching tube from being damaged.
Description
Technical Field
The invention belongs to the technical field of resonance, and particularly relates to a resonant circuit abnormity control circuit, a control method and a resonant device.
Background
In LLC resonant circuit topologies, when a circuit anomaly is detected, the drive needs to be blocked. The traditional method is that when the circuit abnormality is detected, the drive is immediately blocked, but if a larger current exists in the resonant cavity at the moment, the drive is immediately turned off, the switch tube of the LLC resonant circuit loses soft switching, and large di/dt changes exist, so that a larger voltage stress is caused on the switch tube, and the switch tube is easily damaged.
Disclosure of Invention
In view of this, embodiments of the present invention provide a resonant circuit abnormality control circuit, a control method, and a resonant device, so as to solve the problem that the switching tube is easily damaged by the existing drive blocking method.
A first aspect of an embodiment of the present invention provides a resonant circuit abnormality control circuit, including: the device comprises a sampling module, a conditioning module and a controller;
the input end of the sampling module is connected with the output end of the resonant circuit, and the output end of the sampling module is connected with the input end of the conditioning module, so that the sampling module is used for collecting the electrical parameters of the resonant circuit and sending the electrical parameters to the conditioning module;
the output end of the conditioning module is connected with the input end of the controller and used for sending a driving abnormal signal to the controller when the electrical parameter exceeds a preset range;
And the output end of the controller is connected with the input end of the resonant circuit and is used for stopping sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit when the abnormal driving signal is received.
A second aspect of an embodiment of the present invention provides a resonance apparatus, including a resonance circuit and the resonance circuit abnormality control circuit of the first aspect connected to the resonance circuit;
a third aspect of the embodiments of the present invention provides a method for controlling an abnormality of a resonant circuit, which is applied to the resonant circuit abnormality control circuit described in the first aspect, and the method for controlling an abnormality of a resonant circuit includes:
acquiring an electrical parameter of the resonant circuit, and judging whether the electrical parameter exceeds a preset range;
and when the electrical parameter is determined to exceed the preset range, stopping sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the embodiment of the invention collects the electrical parameters of the resonant circuit through the sampling module, judges whether the electrical parameters exceed the preset range through the conditioning module, and sends a driving abnormal signal to the controller if the electrical parameters exceed the preset range, and the controller stops sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit after receiving the driving abnormal signal.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an abnormality control circuit of a resonant circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an abnormal control circuit of a resonant circuit according to an embodiment of the present invention;
fig. 3 is a timing diagram of blocking driving when the resonant cavity current of the resonant circuit is overcurrent according to an embodiment of the present invention;
fig. 4 is a timing diagram of blocking driving when the output current of the resonant circuit is overcurrent according to an embodiment of the present invention;
fig. 5 is a timing diagram of blocking driving when the output voltage of the resonant circuit is over-voltage according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, the resonant circuit abnormality control circuit provided in the embodiment of the present invention includes a sampling module 10, a conditioning module 20, and a controller 30;
the sampling module 10 is connected with the output end of the resonant circuit 40 at the input end, and the output end of the sampling module is connected with the input end of the conditioning module 20, and is used for collecting the electrical parameters of the resonant circuit 40 and sending the electrical parameters to the conditioning module 20;
the output end of the conditioning module 20 is connected with the input end of the controller 30, and is used for sending a driving abnormal signal to the controller 30 when the electrical parameter exceeds a preset range;
and the output end of the controller 30 is connected with the input end of the resonant circuit 40, and is used for stopping sending the driving signal to the resonant circuit 40 after the driving signal of the current switching period is sent to the resonant circuit 40 when the driving abnormal signal is received.
In the embodiment of the present invention, the resonant circuit 40 may be an LLC resonant circuit, and the specific structure can be seen in fig. 2.
The sampling module 10 may collect electrical parameters of the resonant circuit 40 and transmit the collected electrical parameters of the resonant circuit 40 to the conditioning module 20. The conditioning module 20 may process the electrical parameter, determine whether the electrical parameter exceeds a preset range, and send a driving abnormal signal to the controller 30 if it is determined that the electrical parameter exceeds the preset range and indicates that the resonant circuit 40 is abnormal; if the electrical parameter is determined not to exceed the preset range, which indicates that the resonant circuit 40 is not abnormal, a driving normal signal is sent to the controller 30. When the controller 30 receives the driving normal signal, it normally sends the driving signal to the resonant circuit 40 periodically, and drives the resonant circuit 40 to work normally; when receiving the driving abnormality signal, the controller 30 stops transmitting the driving signal to the resonant circuit 40 after transmitting the driving signal of the current switching cycle to the resonant circuit 40, thereby blocking the driving.
Here, the abnormal driving signal may be a low level signal, and the normal driving signal may be a high level signal. The controller 30 may be a DSP (digital signal processor), and may be configured by an EPWM manager of the DSP to control a PWM (Pulse width modulation) drive sent to the resonant circuit 40.
It can be known from the above description that the embodiment of the present invention locks the driving at the end of a switching period, and by utilizing the characteristic that the current in the resonant cavity 41 is small at this time, the voltage stress of the switching tube can be reduced, and the switching tube can be effectively prevented from being damaged. In addition, the switching frequency of the LLC resonant circuit 40 is currently at 100KHz and higher, and therefore, when an abnormality is found in the LLC resonant circuit 40, the switching frequency does not exceed 10us until the LLC resonant circuit is driven in a blocking mode.
In one embodiment of the invention, referring to fig. 2, the output of the resonant circuit 40 comprises a first resonant output, a second resonant output, a third resonant output and a fourth resonant output; the inputs of conditioning module 20 include a first conditioning input, a second conditioning input, a third conditioning input, a fourth conditioning input, a fifth conditioning input, and a sixth conditioning input; the electrical parameters include a resonant cavity current of the resonant circuit 40, an output current of the resonant circuit 40, and an output voltage of the resonant circuit 40;
The sampling module 10 includes a first sampling unit 11 and a second sampling unit 12;
the first sampling unit 11 has a first input end connected to the first resonance output end, a second input end connected to the second resonance output end, a first output end connected to the first conditioning input end, and a second output end connected to the second conditioning input end, and is configured to collect a resonant cavity current of the resonant circuit 40 and send the resonant cavity current of the resonant circuit 40 to the conditioning module 20;
and the second sampling unit 12 is connected with the first input end and the third resonance output end, the second input end and the fourth resonance output end, the first output end and the third conditioning input end are connected, the second output end and the fourth conditioning input end are connected, the third output end and the fifth conditioning input end are connected, and the fourth output end and the sixth conditioning input end are connected, so that the output current of the resonance circuit 40 and the output voltage of the resonance circuit 40 are acquired, and the output current of the resonance circuit 40 and the output voltage of the resonance circuit 40 are sent to the conditioning module 20.
In the embodiment of the present invention, the electrical parameters of the resonant circuit 40 collected by the sampling module 10 include a resonant cavity current of the resonant circuit 40, an output current of the resonant circuit 40, and an output voltage of the resonant circuit 40. Whether the resonant circuit 40 is abnormal is judged by judging whether the resonant cavity current is overcurrent, whether the output current is overcurrent and whether the output voltage is overvoltage.
Specifically, referring to fig. 2, a first resonant output end and a second resonant output end are led out from the resonant cavity 41 of the resonant circuit 40, and are connected to the first sampling unit 11, and the resonant cavity current of the resonant circuit 40 is collected through the first sampling unit 11. The first resonant output end and the second resonant output end can be led out at the position (between the resonant inductor Lr1 and the excitation inductor Lm 1) in fig. 2, and it should be noted that when the first resonant output end and the second resonant output end do not need to be led out, the resonant inductor Lr1 and the excitation inductor Lm1 are directly connected in series; a first output end and a second output end can also be led out between the excitation inductor Lm1 and the resonant capacitor Cr 1; the first output terminal and the second output terminal can also be led out at other positions where the resonant cavity current can be collected, and are not limited to the positions shown in fig. 2. A third resonant output end and a fourth resonant output end are led out from the output port of the resonant circuit 40, and are connected with the second sampling unit 12, and the output current and the output voltage of the resonant circuit 40 are collected through the second sampling unit 12.
In one embodiment of the present invention, referring to fig. 2, the first sampling unit 11 includes a first transformer T1 and a first resistor R1;
a first transformer T1, a first end of the primary coil being connected to a first input terminal of the first sampling unit 11, a second end of the primary coil being connected to a second input terminal of the first sampling unit 11, a first end of the secondary coil being connected to a first end of a first resistor R1, a second end of the secondary coil being connected to a second end of a first resistor R1;
The first end of the first resistor R1 is further connected to the first output end of the first sampling unit 11, and the second end is further connected to the second output end of the first sampling unit 11.
In one embodiment of the present invention, referring to fig. 2, the second sampling unit 12 includes a first capacitor C1, a second capacitor C2, a second resistor R2 and a third resistor R3;
a first capacitor C1, a first end of which is connected to the first input end of the second sampling unit 12 and the first end of the second resistor R2, respectively, and a second end of which is connected to the first end of the second capacitor C2;
a third resistor R3, a first end of which is connected to the second input end of the second sampling unit 12 and the second end of the second capacitor C2, respectively, and a second end of which is connected to the second end of the second resistor R2;
a third resistor R3, the second end of which is further connected to the first output end of the second sampling unit 12, and the first end of which is further connected to the second output end of the second sampling unit 12;
and a second resistor R2, the first terminal of which is further connected to the third output terminal of the second sampling unit 12, and the second terminal of which is further connected to the fourth output terminal of the second sampling unit 12.
In one embodiment of the present invention, referring to fig. 2, the inputs of the controller 30 comprise a first control input, a second control input and a third control input; the driving abnormal signal comprises a first abnormal signal, a second abnormal signal and a third abnormal signal;
The conditioning module 20 comprises a first conditioning unit 21, a second conditioning unit 22 and a third conditioning unit 23;
a first conditioning unit 21, having a first input end connected to the first conditioning input end, a second input end connected to the second conditioning input end, and an output end connected to a first control input end (pin TZ 1), for sending a first abnormal signal to the controller 30 when a resonant cavity current of the resonant circuit 40 is greater than or equal to a first preset current value;
a second conditioning unit 22, having a first input connected to the third conditioning input, a second input connected to the fourth conditioning input, and an output connected to a second control input (pin TZ 2), for sending a second abnormal signal to the controller 30 when the output current of the resonant circuit 40 is greater than or equal to a second preset current value;
and a third conditioning unit 23, having a first input connected to the fifth conditioning input, a second input connected to the sixth conditioning input, and an output connected to a third control input (pin TZ 3), for sending a third abnormal signal to the controller 30 when the output voltage of the resonant circuit 40 is greater than or equal to the first preset voltage value.
In one embodiment of the present invention, referring to fig. 2, the structure of the first conditioning unit 21, the structure of the second conditioning unit 22 and the structure of the third conditioning unit 23 are the same, and the first conditioning unit 21 includes a first comparator a1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9;
A first comparator a1, a first input end of which is connected to the first input end of the first conditioning unit 21 through a fourth resistor R4 and a fifth resistor R5, a second input end of which is connected to the second input end of the first conditioning unit 21 through a sixth resistor R6 and a seventh resistor R7, and an output end of which is connected to the first control input end;
an eighth resistor R8, having a first end connected to the first input terminal of the first comparator a1 and a second end connected to the output terminal of the first comparator a 1;
and a ninth resistor R9, having a first end connected to the second input end of the first comparator a1 and a second end connected to the output end of the first comparator a 1.
Specifically, the first conditioning unit 21 obtains voltage signals at two ends of the first resistor R1, and compares whether a difference between the voltage signals at two ends of the first resistor R1 is greater than or equal to a second preset voltage value, so as to determine whether the resonant cavity current is greater than or equal to a first preset current value. If the difference between the voltage signals at the two ends of the first resistor R1 is greater than or equal to the second preset voltage value, which indicates that the resonant cavity current is greater than or equal to the first preset current value, i.e. the resonant cavity current is over-current, the first conditioning unit 21 outputs a first abnormal signal to the controller 30, for example, outputs a low level to the controller 30. If the difference between the voltage signals at the two ends of the first resistor R1 is smaller than the second preset voltage value, which indicates that the resonant cavity current is smaller than the first preset current value, i.e. the resonant cavity current is not over-current, the first conditioning unit 21 outputs a first normal signal to the controller 30, for example, outputs a high level to the controller 30. The first preset current value multiplied by the resistance of the first resistor R1 is a first preset voltage value, and the first preset current value can be set according to actual requirements.
The working principle of the second conditioning unit 22 and the third conditioning unit 23 is similar to that of the first conditioning unit 21, and the description thereof is omitted.
Optionally, the structure of the first conditioning unit 21, the structure of the second conditioning unit 22, and the structure of the third conditioning unit 23 may also be different from each other, and may implement corresponding functions.
In one embodiment of the present invention, referring to fig. 2, when any one of the first abnormal signal, the second abnormal signal, and the third abnormal signal is received, the controller 30 stops transmitting the driving signal to the resonant circuit 40 after transmitting the driving signal of the current switching cycle to the resonant circuit 40.
Specifically, the controller 30 indicates that the resonant cavity current is over-current when receiving the first abnormal signal, indicates that the output current is over-current when receiving the second abnormal signal, and indicates that the output voltage is over-voltage when receiving the third abnormal signal. Therefore, when the controller 30 receives any one of the above-mentioned abnormality signals, it indicates that the resonance circuit 40 is abnormal, and therefore, the controller 30 stops transmitting the driving signal to the resonance circuit 40 after transmitting the driving signal of the current switching cycle to the resonance circuit 40.
When the controller 30 receives the corresponding abnormal signal, that is, the corresponding TZ pin is pulled low, the TZ interrupt function of the DSP is entered, and the driving is blocked after the driving of the current switching period is finished. Illustratively, referring to fig. 3, the controller 30 receives the first abnormal signal at position 31, but blocks the driving at position 32, and the current on the switch tube is small, and the off-stage voltage stress is small, so as to prevent the switch tube from being damaged. Similarly, referring to fig. 4, controller 30 receives a second exception signal at position 33, but blocks drive at position 34; referring to fig. 5, the controller 30 receives the third anomaly signal at position 35, but blocks the drive at position 36.
In a specific application, in order to implement that when the TZ pin is pulled low, and after the driving signal of the current switching period is sent, the PWM driving is turned off, the specific configuration is as follows:
1. initial configuration of the EPWM of the controller DSP:
1) TZA bits of a TZCTL register of the EPWM1/2/3/4 are configured to be 03, and after the TZ is triggered, the PWM drive does not do any action; AQCSFRC employs a shadow register mode, reloading when a zero crossing is counted.
EPwm1Regs.TZCTL.bit.TZA＝TZ_NO_CHANGE；
EPwm1Regs.AQSFRC.bit.RLDCSF＝0；
EPwm2Regs.TZCTL.bit.TZA＝TZ_NO_CHANGE；
EPwm2Regs.AQSFRC.bit.RLDCSF＝0；
EPwm3Regs.TZCTL.bit.TZA＝TZ_NO_CHANGE；
EPwm3Regs.AQSFRC.bit.RLDCSF＝0；
EPwm4Regs.TZCTL.bit.TZA＝TZ_NO_CHANGE；
EPwm4Regs.AQSFRC.bit.RLDCSF＝0；
2) The OST bit of the tzein register of EPWM1 is set to 01, enabling TZ interrupts.
EPwm1Regs.TZEINT.bit.OST＝1；
2. The TZ interrupt function is configured as follows, controlling the PWM port to a low level.
3. The AD sampling interrupt function is configured as follows
In an AD sampling interrupt function of the DSP, if the INT mark of the TZFLAG register is found to be true, whether all three TZ pins are high level is judged, if yes, the INT mark bit is cleared, and the method comprises the following steps:
if ((TRUE) ═ epwm1regs.tzflg.bit.int) & (all three TZ pins are high)
Further, an embodiment of the present invention further provides a resonant device, which includes a resonant circuit 40 and any one of the above resonant circuit abnormality control circuits connected to the resonant circuit 40.
Further, corresponding to the resonant circuit abnormality control circuit in the above embodiment, an embodiment of the present invention further provides a resonant circuit abnormality control method, which may include the following steps:
Acquiring an electrical parameter of the resonant circuit 40, and judging whether the electrical parameter exceeds a preset range;
when it is determined that the electrical parameter exceeds the preset range, the transmission of the driving signal to the resonant circuit 40 is stopped after the transmission of the driving signal of the current switching period to the resonant circuit 40 is completed.
If it is determined that the electrical parameter does not exceed the preset range, a drive signal is periodically sent to the resonant circuit 40. Specifically, a first driving signal is sent to the switching tube Q1 and the switching tube Q3, and a second driving signal is sent to the switching tube Q2 and the switching tube Q4.
In one embodiment of the present invention, the electrical parameters include a resonant cavity current of the resonant circuit 40, an output current of the resonant circuit 40, and an output voltage of the resonant circuit 40;
judging whether the electrical parameter exceeds a preset range, including:
judging whether the resonant cavity current of the resonant circuit 40 is greater than or equal to a first preset current value, whether the output current of the resonant circuit 40 is greater than or equal to a second preset current value, and whether the output voltage of the resonant circuit 40 is greater than or equal to a first preset voltage value;
if the resonant cavity current of the resonant circuit 40 is greater than or equal to a first preset current value, or the output current of the resonant circuit 40 is greater than or equal to a second preset current value, or whether the output voltage of the resonant circuit 40 is greater than or equal to a first preset voltage value, determining that the electrical parameter exceeds a preset range; otherwise, determining that the electrical parameter does not exceed the preset range.
For a specific implementation manner, reference may be made to the specific description in the above resonant circuit exception control circuit, and details are not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A resonant circuit anomaly control circuit, comprising: the device comprises a sampling module, a conditioning module and a controller;
the input end of the sampling module is connected with the output end of the resonant circuit, and the output end of the sampling module is connected with the input end of the conditioning module, and the sampling module is used for collecting the electrical parameters of the resonant circuit and sending the electrical parameters to the conditioning module;
the output end of the conditioning module is connected with the input end of the controller and used for sending a driving abnormal signal to the controller when the electrical parameter exceeds a preset range;
and the output end of the controller is connected with the input end of the resonant circuit and is used for stopping sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit when the abnormal driving signal is received.
2. The resonant circuit anomaly control circuit of claim 1, wherein said resonant circuit output comprises a first resonant output, a second resonant output, a third resonant output, and a fourth resonant output; the input of the conditioning module comprises a first conditioning input, a second conditioning input, a third conditioning input, a fourth conditioning input, a fifth conditioning input, and a sixth conditioning input; the electrical parameters include a resonant cavity current of the resonant circuit, an output current of the resonant circuit, and an output voltage of the resonant circuit;
The sampling module comprises a first sampling unit and a second sampling unit;
the first sampling unit is connected with the first resonance output end at a first input end, is connected with the second resonance output end at a second input end, is connected with the first conditioning input end at a first output end, and is used for collecting resonant cavity current of the resonant circuit and sending the resonant cavity current of the resonant circuit to the conditioning module at a second output end;
the second sampling unit is connected with the third resonance output end through a first input end, connected with the fourth resonance output end through a second input end, connected with the third conditioning input end through a first output end, connected with the fourth conditioning input end through a second output end, connected with the fifth conditioning input end through a third output end, and connected with the sixth conditioning input end through a fourth output end, and is used for collecting the output current of the resonance circuit and the output voltage of the resonance circuit and sending the output current of the resonance circuit and the output voltage of the resonance circuit to the conditioning module.
3. The resonance circuit abnormality control circuit according to claim 2, wherein said first sampling unit includes a first transformer and a first resistor;
The first end of the primary coil of the first transformer is connected with the first input end of the first sampling unit, the second end of the primary coil of the first transformer is connected with the second input end of the first sampling unit, the first end of the secondary coil of the first transformer is connected with the first end of the first resistor, and the second end of the secondary coil of the first transformer is connected with the second end of the first resistor;
the first end of the first resistor is also connected with the first output end of the first sampling unit, and the second end of the first resistor is also connected with the second output end of the first sampling unit.
4. The resonant circuit abnormality control circuit according to claim 2, wherein the second sampling unit includes a first capacitor, a second resistor, and a third resistor;
a first end of the first capacitor is connected with a first input end of the second sampling unit and a first end of the second resistor respectively, and a second end of the first capacitor is connected with a first end of the second capacitor;
a first end of the third resistor is connected with a second input end of the second sampling unit and a second end of the second capacitor respectively, and a second end of the third resistor is connected with a second end of the second resistor;
the second end of the third resistor is also connected with the first output end of the second sampling unit, and the first end of the third resistor is also connected with the second output end of the second sampling unit;
And the first end of the second resistor is also connected with the third output end of the second sampling unit, and the second end of the second resistor is also connected with the fourth output end of the second sampling unit.
5. The resonant circuit anomaly control circuit according to any one of claims 2 to 4, wherein the input of the controller comprises a first control input, a second control input and a third control input; the driving abnormal signal comprises a first abnormal signal, a second abnormal signal and a third abnormal signal;
the conditioning module comprises a first conditioning unit, a second conditioning unit and a third conditioning unit;
the first conditioning unit is connected with the first conditioning input end at a first input end, connected with the second conditioning input end at a second input end, and connected with the first control input end at an output end, and is used for sending the first abnormal signal to the controller when the resonant cavity current of the resonant circuit is greater than or equal to a first preset current value;
the first input end of the second conditioning unit is connected with the third conditioning input end, the second input end of the second conditioning unit is connected with the fourth conditioning input end, and the output end of the second conditioning unit is connected with the second control input end and used for sending the second abnormal signal to the controller when the output current of the resonant circuit is greater than or equal to a second preset current value;
And the first input end of the third conditioning unit is connected with the fifth conditioning input end, the second input end of the third conditioning unit is connected with the sixth conditioning input end, and the output end of the third conditioning unit is connected with the third control input end, so that the third conditioning unit is used for sending the third abnormal signal to the controller when the output voltage of the resonant circuit is greater than or equal to a first preset voltage value.
6. The resonant circuit abnormality control circuit according to claim 5, wherein the first conditioning unit, the second conditioning unit, and the third conditioning unit are identical in structure, and the first conditioning unit includes a first comparator, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor;
a first comparator, a first input end of which is connected with the first input end of the first conditioning unit through the fourth resistor and the fifth resistor, a second input end of which is connected with the second input end of the first conditioning unit through the sixth resistor and the seventh resistor, and an output end of which is connected with the first control input end;
a first end of the eighth resistor is connected with the first input end of the first comparator, and a second end of the eighth resistor is connected with the output end of the first comparator;
And a first end of the ninth resistor is connected with the second input end of the first comparator, and a second end of the ninth resistor is connected with the output end of the first comparator.
7. The resonant circuit abnormality control circuit according to claim 5, wherein the controller stops transmission of the drive signal to the resonant circuit after transmission of the drive signal of the current switching cycle to the resonant circuit is completed, when any one of the first abnormality signal, the second abnormality signal, and the third abnormality signal is received.
8. A resonance apparatus comprising a resonance circuit and the resonance circuit abnormality control circuit according to any one of claims 1 to 7 connected to the resonance circuit.
9. A resonance circuit abnormality control method applied to a resonance circuit abnormality control circuit according to any one of claims 1 to 7; the method for controlling the abnormality of the resonant circuit comprises the following steps:
acquiring an electrical parameter of the resonant circuit, and judging whether the electrical parameter exceeds a preset range;
and when the electrical parameter is determined to exceed the preset range, stopping sending the driving signal to the resonant circuit after the driving signal of the current switching period is sent to the resonant circuit.
10. The abnormality control method according to claim 9, characterized in that said electrical parameters include a cavity current of said resonance circuit, an output current of said resonance circuit, and an output voltage of said resonance circuit;
the judging whether the electrical parameter exceeds a preset range includes:
judging whether the resonant cavity current of the resonant circuit is greater than or equal to a first preset current value, whether the output current of the resonant circuit is greater than or equal to a second preset current value and whether the output voltage of the resonant circuit is greater than or equal to a first preset voltage value;
and if the resonant cavity current of the resonant circuit is greater than or equal to a first preset current value, or the output current of the resonant circuit is greater than or equal to a second preset current value, or whether the output voltage of the resonant circuit is greater than or equal to a first preset voltage value, determining that the electrical parameter exceeds a preset range.
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