CN216056791U - Soft switch control circuit and electric control equipment - Google Patents
Soft switch control circuit and electric control equipment Download PDFInfo
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- CN216056791U CN216056791U CN202122105195.4U CN202122105195U CN216056791U CN 216056791 U CN216056791 U CN 216056791U CN 202122105195 U CN202122105195 U CN 202122105195U CN 216056791 U CN216056791 U CN 216056791U
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Abstract
The application provides a soft switch control circuit and electrical control equipment, soft switch control circuit in this application includes: the switch module comprises a detection circuit and a switch branch formed by connecting a first switch tube and a second switch tube in series. The detection circuit comprises a first inductor and a first branch circuit, and the first branch circuit comprises an auxiliary winding and a voltage collector. The auxiliary winding is coupled to the first inductor, the voltage collector is connected with the controller, and the controller is connected with the control ends of the first switch tube and the second switch tube. The current detection can be realized by utilizing the existing element without an additional current detection element, so that the cost is reduced, the size is reduced, and the fast peak current control and the soft switching control can be realized.
Description
Technical Field
The application relates to the field of conversion circuit control, in particular to a soft switch control circuit and an electric control device.
Background
The conventional improved buck converter circuit employs a switching element such as a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) to replace a diode in the conventional buck converter circuit for synchronous rectification. The improved circuit has no reverse recovery problem, and the voltage stress spike is greatly reduced, so that the voltage ripple of the system is improved to a certain extent. And because the voltage stress peak is reduced, the anti-electromagnetic interference performance of the system is improved, and the reliability of the system is improved. In addition, the on-resistance of the MOSFET is small, and under the same working condition, the on-loss of the MOSFET is far smaller than that of the diode, so that the efficiency is improved. Therefore, the synchronous rectification voltage reduction circuit is widely applied to occasions with higher voltage, medium and high power and higher efficiency index requirements.
In order to further improve the efficiency, the synchronous rectification voltage-reducing circuit is controlled to work in a soft switching state by sampling a switching tube current signal of the voltage-reducing circuit, so that the switching loss is eliminated, and the efficiency is improved. The application provides two control schemes for realizing the soft switching state, wherein the first scheme is the control scheme of the soft switching state of zero-voltage switching-on, and the second scheme is the control scheme of the soft switching state of zero-current switching-on. The conventional scheme uses a current detection method that a separate current detection element is usually disposed in the circuit, but this increases the product volume and cost. This will limit the applications where the volume and cost are critical.
Therefore, the prior art has the defects of large volume and high cost of the step-down conversion circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides a soft switch control circuit and an electric control device, and the specific scheme is as follows:
in a first aspect, an embodiment of the present application provides a soft-switching control circuit, where the soft-switching control circuit includes: the switch module and the controller are connected with the electric equipment;
the switch modules comprise detection circuits and switch branches formed by connecting a first switch tube and a second switch tube in series;
the detection circuit comprises a first inductor and a first branch circuit, and the first branch circuit comprises an auxiliary winding and a voltage collector;
the auxiliary winding is coupled to the first inductor, the voltage collector is connected with the controller, and the controller is connected with the control ends of the first switch tube and the second switch tube.
According to a specific embodiment disclosed in the present application, the first switch tube is connected in series with the second switch tube via a bridge arm node to form a switch branch, and the first inductor is connected to the bridge arm node.
According to a specific embodiment disclosed in the present application, the one end of auxiliary winding is connected with the one end of first resistance, the other end of first resistance is connected with the one end of first electric capacity, the other end of first electric capacity with the other end of auxiliary winding is connected, voltage collector connect in the both ends of first electric capacity.
According to a specific embodiment disclosed in the present application, the one end of auxiliary winding is connected with the one end of second inductance, the other end of second inductance is connected with the one end of second resistance, the other end of second resistance with the other end of auxiliary winding is connected, voltage collector connect in the both ends of second resistance.
According to a specific embodiment disclosed in the present application, the number of the switch modules is at least two, and each of the switch modules is connected in parallel.
According to a specific embodiment disclosed in the present application, the first switch tube and the second switch tube are both MOS tubes.
According to one embodiment of the present disclosure, an input capacitor is connected in series between two input terminals of the soft switch control circuit.
According to one embodiment of the present disclosure, an output capacitor is connected in series between two output terminals of the soft switching control circuit.
According to an embodiment of the present disclosure, the auxiliary winding has the same winding polarity as the first inductor.
In a second aspect, an embodiment of the present application provides an electric control apparatus, which includes an electric device and the soft-switch control circuit of any one of the first aspect;
wherein the power consumption equipment is connected with the soft switch control circuit.
Compared with the prior art, the method has the following beneficial effects:
the soft switch control circuit in this application includes: switch module and controller with the consumer connection, switch module all include detection circuitry and by the switch branch road that first switch tube and second switch tube series connection become. The detection circuit comprises a first inductor and a first branch circuit, and the first branch circuit comprises an auxiliary winding and a voltage collector. The auxiliary winding is coupled to the first inductor, the voltage collector is connected with the controller, and the controller is connected with the control ends of the first switch tube and the second switch tube. The current detection can be realized by utilizing the existing element without an additional current detection element, so that the cost is reduced, the size is reduced, and the fast peak current control and the soft switching control can be realized.
Drawings
In order to more clearly explain the technical solutions of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of protection of the present application. Like components are numbered similarly in the various figures.
FIG. 1 is a circuit diagram of a diode rectifying buck circuit;
FIG. 2 is a circuit diagram of a transistor synchronous rectification buck circuit;
fig. 3 is a circuit diagram of a soft switch control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present disclosure;
fig. 5 is a second schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 6 is a second schematic circuit diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 7 is a third schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 8 is a fourth schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present disclosure;
fig. 9 is a third schematic circuit diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 10 is a fourth schematic circuit diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 11 is a fifth schematic circuit diagram of a soft switch control circuit according to an embodiment of the present application;
fig. 12 is a sixth schematic circuit diagram of a soft switch control circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present application, are intended to indicate only specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a circuit schematic diagram of a diode rectifying buck circuit. In a traditional step-down conversion circuit, diode rectification is adopted. The circuit can realize the step-down output of the input voltage.
Because the freewheeling element adopts a diode, the freewheeling element in the voltage reduction circuit has larger forward conduction voltage drop and large conduction loss. In addition, the diode has a serious reverse recovery problem under the condition of high-frequency operation, which can generate a large reverse recovery loss and a high voltage stress peak to influence the voltage ripple of the circuit, so that the anti-electromagnetic interference performance of the whole circuit is reduced, and the service life of the electronic device is reduced. Therefore, the method is only applied to the application occasions with low voltage, low power and no need of high efficiency indexes, and is not suitable for the occasions with medium-high voltage, medium-high power and high efficiency indexes.
In order to solve a series of problems of low efficiency, reverse recovery of a diode and the like of a traditional diode rectification voltage reduction circuit, a synchronous rectification voltage reduction circuit adopting a switching element such as an MOSFET (metal oxide semiconductor field effect transistor) and the like to replace the diode is produced and is widely applied.
Referring to fig. 2, fig. 2 is a circuit diagram of a transistor synchronous rectification buck circuit. The synchronous rectification voltage reduction circuit adopting the switching elements such as the MOSFET to replace the diode does not have the problem of reverse recovery, and the voltage stress peak is greatly reduced, so that the voltage ripple of the system is improved to a certain extent. And because the voltage stress peak is reduced, the EMI performance of the system is improved, and the reliability of the system is improved. In addition, the on-resistance of the MOSFET is small, and under the same working condition, the on-loss of the MOSFET is far smaller than that of the diode, so that the efficiency is improved.
In order to further improve the efficiency, two schemes are provided, the first scheme is that the synchronous rectification voltage reduction circuit can be controlled to work in a soft switching state of zero voltage switching-on, so that the switching-on loss is eliminated, and the voltage stress spike is eliminated. The second scheme is that the first switching tube of the synchronous rectification voltage reduction circuit can be controlled to work in a soft switching state of zero current switching-on, so that the switching-on loss is eliminated.
The method for realizing the soft switching is to detect the current of a chopping inductor or the current of a switching tube, and control the on-off of the switching tube according to the current of the switching tube, so that the voltages at two ends of the switching tube are clamped to be close to zero volt, and further realize the zero voltage switching-on; or the switch tube is switched on when the current is zero, thereby realizing zero current switching-on.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a soft switch control circuit according to an embodiment of the present disclosure. In an embodiment of the present application, the soft switching control circuit includes:
the switch module 10 and the controller CTL1 are used for connecting with the electric equipment;
the switch modules 10 each include a detection circuit 101 and a switch branch 102 formed by connecting a first switch tube S1 and a second switch tube S2 in series;
the detection circuit 101 comprises a first inductor L1 and a first branch 1011, and the first branch 1011 comprises an auxiliary winding Ns1 and a voltage collector V1;
the auxiliary winding Ns1 is coupled to the first inductor L1, the voltage collector V1 is connected to the controller CTL1, and the controller CTL1 is connected to the control terminals of the first switch tube S1 and the second switch tube S2.
In the embodiment of the application, an input capacitor C1 is connected in series between two input ends of the soft switch control circuit, and an output capacitor C2 is connected in series between two output ends of the soft switch control circuit. Specifically, the first switching tube S1 is connected in series with the second switching tube S2 via a bridge arm node to form a switching branch 102, and two ends of the switching branch 102 are respectively connected to two input ends through the input capacitor C1. The first switch tube S1 is a main switch tube, the second switch tube S2 is a rectifier tube, and one end of the first inductor L1 is connected to the bridge arm node. The source of the second switch tube is connected to the negative output end, and the other end of the first inductor L1 is connected to the positive output end.
Specifically, the output voltage of the switch module 10 is led out of the auxiliary winding Ns1 through the first inductor L1, the voltage at two ends of the auxiliary winding Ns1 is collected by the voltage collector V1 included in the existing first branch 1011 in the circuit, so that the voltage signal of the first inductor L1 can be reflected in real time, and by designing appropriate parameters of electronic components in the first branch 1011, the voltage collected by the voltage collector V1 and the current of the main winding of the first inductor L1 can have almost the same rising slope and falling slope, so that complete current information of the first inductor L1 can be obtained, and the collected voltage information is fed back to the controller CTL1, so that the controller CTL1 controls the on-off of the switching tube, and the soft switching control and the peak current control of the soft switching control circuit are realized.
The method omits independent current detection elements in the traditional scheme, such as a Hall current sensor, a current transformer, a sampling resistor and the like, and achieves the technical effects of reducing cost and volume. In addition, complete inductive current information, namely positive inductive current and negative inductive current, is obtained by detecting the voltage of the auxiliary winding Ns1, so that accurate peak current control and soft switching can be realized through the complete inductive current information, and the rapid dynamic response characteristic is realized.
In the embodiment of the application, one end of the auxiliary winding Ns1 is connected to one end of a first resistor Ra1, the other end of the first resistor Ra1 is connected to one end of a first capacitor Ca, the other end of the first capacitor Ca is connected to the other end of the auxiliary winding Ns1, and the voltage collector V1 is connected to two ends of the first capacitor Ca.
In the embodiment of the present application, the auxiliary winding Ns1 has the same winding polarity as the first inductor L1.
Referring to fig. 4, fig. 4 is a schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present disclosure. In the first branch 1011, the newly added auxiliary winding Ns1 and the existing first resistor Ra1And the first capacitor Ca are connected in sequence, namely the rear end of the auxiliary winding Ns1 is connected with the RC network. In the conventional current detection scheme, a current sampling device is required to be utilized, and a related resistor and a related capacitor are required to be connected to the rear end of the current sampling device to complete further signal conditioning. Therefore, the current sampling element in the prior scheme is removed, and the existing resistor and capacitor in the circuit can be directly utilized. The voltage of the auxiliary winding Ns1 passes through the first resistor Ra1Charging and discharging the first capacitor Ca by designing the appropriate Ra1Ca parameter, the voltage V on the first capacitor Ca can be enabledCaCurrent I to the first inductor L1L1Has almost the same rising slope and falling slope, and thus detects the voltage V on the first capacitor CaCaComplete current information of the primary winding of the first inductor L1 is obtained. The method specifically comprises the following steps:
at time t1, the first switch transistor S1, i.e., the upper transistor, is turned on, and the voltage V across the primary winding of the first inductor L1L1The polarity is positive left, negative right, and the current I of the first inductor L1L1Linearly rises when the voltage V across the auxiliary winding Ns1Ns1Is also positive left, negative right, VL1And VNs1The ratio of the number of turns of the main winding to the number of turns of the auxiliary winding Ns1 is n. Auxiliary winding Ns1 voltage VNs1Through a first resistor Ra1For the firstCharging a capacitor Ca;
at time t2, the first switch tube S1 is turned off, and the voltage V across the main winding of the first inductor L1L1The polarity is changed into the I of the first inductor L1L1The current drops linearly when the voltage V across the auxiliary winding Ns1 isNs1Also becomes left negative, right positive, VL1And VNs1The ratio of the number of turns of the main winding to the number of turns of the auxiliary winding Ns1 is n. Auxiliary winding Ns1 voltage VNs1Through a first resistor Ra1The first capacitor Ca is charged in reverse, i.e. the first capacitor Ca is discharged. By designing appropriate Ra1Ca parameter, the voltage V on the capacitor Ca can be adjustedCaCurrent to main winding IL1Have almost the same rising and falling slopes. Thus by detecting the voltage V across the first capacitor Ca in real timeCaFull current information of the primary winding of the first inductor L1 is obtained.
After obtaining the current information of the first inductor L1, when the current I of the first inductor L1L1Reaches a set forward current threshold ILpeakThe controller CTL1 controls the voltage V between the gate and the source of the first switch tube S1gs1To turn off the first switching tube S1, thereby realizing peak current control; after the first switch tube S1 is turned off, the first inductor current IL1Decrease when the first inductor current IL1Down to a set negative current value threshold ILminThe controller CTL1 controls the voltage V between the gate and the source of the second switch tube S2gs2To turn off the second switching tube S2. Then, in the dead time, the first inductor current IL1The freewheeling of the body diode of the first switch tube S1 drives the voltage V across the first switch tube S1DS-S1The voltage is clamped to be close to 0V, the first switch tube S1 is switched on after dead time, zero voltage switching on of the first switch tube S1 is achieved, soft switching is achieved, negative current of the first inductor L1 is limited to continue increasing, the current effective value of the first inductor L1 is reduced, and loss of the switch tube is reduced. And by controlling the threshold value of the negative current of the first inductor L1, the current effective value of the first inductor L1 can be effectively reduced, so that the conduction loss of the switching tube is reduced, and the efficiency of the system is further improved.
Referring to fig. 5, fig. 5 is a second schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present application. After obtaining the current information of the first inductor L1, the current I when the first inductor L1L1Reaches a set forward current threshold ILpeakThe controller CTL1 controls the voltage V between the gate and the source of the first switch tube S1gs1To turn off the first switching tube S1, thereby realizing peak current control; after the first switch tube S1 is turned off, the first inductor current IL1Decrease when the first inductor current IL1Down to ILminWhen the voltage is equal to or close to 0A, the controller CTL1 controls the voltage V between the gate and the source of the second switch tube S2gs2To turn off the second switching tube S2. And then the first switch tube S1 is switched on after dead time, so that zero current switching-on of the first switch tube S1 is realized, soft switching is realized, loss of the switch tube is reduced, and efficiency of the system is improved.
In the embodiment of the present application, one end of the auxiliary winding Ns1 is connected to one end of a second inductor La, and the other end of the second inductor La is connected to a second resistor Ra2Is connected with the other end of the auxiliary winding Ns1, the other end of the second resistor Ra2 is connected with the other end of the auxiliary winding Ns1, and the voltage collector V1 is connected with the second resistor Ra2At both ends of the same.
Referring to fig. 6, fig. 6 is a second circuit schematic diagram of a soft switch control circuit according to an embodiment of the present application. In specific implementation, the rear end of the auxiliary winding Ns1 can be connected to the existing LR network, that is, the auxiliary winding Ns1, the second inductor La and the second resistor R, in addition to the RC networka2Sequentially connected to form an LR loop, and a voltage collector V1 collects a second resistor Ra2The voltage across the terminals.
Referring to fig. 7, fig. 7 is a third schematic circuit waveform diagram of a soft switch control circuit according to an embodiment of the present application. Voltage V of auxiliary winding Ns1Ns1Exciting and demagnetizing the second inductor La by designing proper La and Ra2Parameter, can be such that the second resistance Ra2Voltage V onRa2Current I to the primary winding of the first inductor L1L1Have almost the same rising slope and falling slope, and thus detectVoltage V across the second resistor RaRa2The current information of the primary winding of the first inductor L1 can be obtained. The method specifically comprises the following steps:
at time t1, the first switch tube S1, i.e., the upper tube, is on, and the voltage V across the main winding of the first inductor L1L1Polarity is positive left, negative right, I of the first inductor L1L1The current rises linearly, when the voltage V across the auxiliary winding Ns1 isNs1Is also positive left, negative right, VL1And VNs1The ratio of the number of turns of the main winding to the number of turns of the auxiliary winding Ns1 is n. The voltage of the auxiliary winding Ns1 excites the second inductor La, the current of the second inductor La rises linearly, and the second resistor Ra2Voltage V acrossRaThe linear increase;
at time t2, the first switch tube S1 is turned off, and the voltage V across the main winding of the first inductor L1L1The polarity of the current I is changed into left negative and right positive, and the current I of the first inductor L1L1Linearly decreases when the voltage V across the auxiliary winding Ns1 decreasesNs1Also becomes left negative, right positive, VL1And VNs1The ratio of the number of turns of the main winding to the number of turns of the auxiliary winding Ns1 is n. Voltage V of auxiliary winding Ns1Ns1Demagnetizing the second inductor La, linearly increasing the current of the second inductor La, and linearly increasing the second resistor Ra2Voltage V acrossRa2The linearity decreases. By designing appropriate La and Ra2Parameter, can be such that the second resistance Ra2Voltage V onRa2Current I to the main winding of the first inductor L1L1Has almost the same rising slope and falling slope, and thus the second resistance R is detected in real timea2Voltage V onRa2The complete current information of the primary winding of the first inductor L1 can be obtained.
After the current information of the first inductor L1 is obtained, when the current of the first inductor L1 reaches the set forward current threshold ILpeakThe controller CTL1 controls the voltage V between the gate and the source of the first switch tube S1gs1To turn off the first switching tube S1, thereby realizing peak current control; after the first switch tube S1 is turned off, the current of the first inductor L1 decreases, and when the current of the first inductor L1 decreases to the set negative current threshold ILminThe controller CTL1 controls the second switch tube S2Voltage V between grid and sourcegs2To turn off the second switching tube S2. Then, in the dead time, the current of the first inductor L1 freewheels through the body diode of the first switch tube S1, and the voltage V across the first switch tube S1 is converted into the voltage VDS-S1The clamping is close to 0V, the first switch tube S1 is switched on after dead time, and therefore zero voltage switching-on of the first switch tube S1 is achieved, and soft switching is achieved.
Referring to fig. 8, fig. 8 is a fourth schematic diagram illustrating a circuit waveform of a soft switch control circuit according to an embodiment of the present disclosure. After the current information of the first inductor L1 is obtained, when the current of the first inductor L1 reaches the set forward current threshold ILpeakThe controller CTL1 controls the voltage V between the gate and the source of the first switch tube S1gs1To turn off the first switching tube S1, thereby realizing peak current control; after the first switch tube S1 is turned off, the current of the first inductor L1 decreases, and when the current of the first inductor L1 decreases to ILminWhen the voltage is equal to or close to 0A, the controller CTL1 controls the voltage V between the gate and the source of the second switch tube S2gs2To turn off the second switching tube S2. And then the first switch tube S1 is switched on after the dead time, so that zero current switching-on of the first switch tube S1 is realized, and soft switching is realized.
In addition, referring to fig. 9, fig. 9 is a third schematic diagram of a soft switch control circuit according to an embodiment of the present application. The difference from the circuit shown in fig. 3 is that the source of the first switch tube S1 is connected to the negative input terminal, the drain of the second switch tube S2 is connected to the positive input terminal, and in this embodiment, the drain of the second switch tube S2 is connected to the positive output terminal, and the other end of the first inductor L1 is connected to the negative output terminal. Fig. 4 and 5 can be referred to for the waveform diagram of the circuit corresponding to fig. 9, and the details are not repeated here.
Referring to fig. 10, fig. 10 is a fourth schematic diagram of a soft switching control circuit provided in the embodiment of the present application, and the circuit diagram shown in fig. 10 is based on the circuit diagram shown in fig. 9, in which an RC network terminated at the rear end of the auxiliary winding Ns1 is changed into an LR network. The detailed structural description of the circuit shown in fig. 10 and the corresponding waveform schematic diagram of the circuit can refer to fig. 6, fig. 7 and fig. 8, which are not repeated here.
In the embodiment of the present application, the number of the switch modules 10 is at least two, and each of the switch modules is connected in parallel.
Specifically, when the number of the switch modules 10 is 2, the soft switch control circuit is a two-phase interleaved parallel synchronous rectification step-down circuit, and the 2 parallel circuits can be referred to as an a phase and a B phase, respectively.
In the embodiment of the present application, the first switch tube and the second switch tube are both MOS tubes.
Referring to fig. 11 and 12, fig. 11 is a fifth circuit schematic diagram of a soft-switching control circuit provided in the embodiment of the present application, and fig. 12 is a sixth circuit schematic diagram of a soft-switching control circuit provided in the embodiment of the present application. The main circuit of the two-phase interleaved parallel synchronous rectification and voltage reduction circuit comprises a main circuit with the same A phase and B phase, A, B two phases of the two-phase interleaved synchronous rectification and voltage reduction circuit work in an interleaved mode, the control method and the working process are the same, and the difference is only half of a switching period. In addition, any main circuit in the two-phase interleaved parallel synchronous rectification and voltage reduction circuit may also be a soft switching control circuit shown in fig. 9 or fig. 10, which is not further limited herein.
Corresponding to the foregoing embodiments, embodiments of the present application further provide an electric control device, where the electric control device includes an electric device and the soft switch control circuit described in any one of the foregoing embodiments;
wherein the power consumption equipment is connected with the soft switch control circuit.
In summary, according to the soft switching control circuit and the electric control device disclosed by the application, the current detection of the first inductor is indirectly realized by leading the auxiliary winding out of the first inductor, so that the complete current information of the first inductor is obtained, and the soft switching and peak current control are realized. An independent current detection element is not required to be arranged, so that the current balancing circuit has a quick dynamic response characteristic and a good current sharing characteristic, eliminates the turn-on loss, reduces the turn-on loss and improves the efficiency. For a specific implementation process of the electric control device, reference may be made to the specific implementation process of the soft switch control circuit provided in the foregoing embodiment, and details are not repeated here.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (10)
1. A soft-switching control circuit, comprising: the switch module and the controller are used for being connected with electric equipment;
the switch modules comprise detection circuits and switch branches formed by connecting a first switch tube and a second switch tube in series;
the detection circuit comprises a first inductor and a first branch circuit, and the first branch circuit comprises an auxiliary winding and a voltage collector;
the auxiliary winding is coupled to the first inductor, the voltage collector is connected with the controller, and the controller is connected with the control ends of the first switch tube and the second switch tube.
2. The soft-switching control circuit of claim 1, wherein the first switching tube is connected in series with a second switching tube via a bridge arm node to form a switching branch, and the first inductor is connected to the bridge arm node.
3. The soft-switching control circuit according to claim 1, wherein one end of the auxiliary winding is connected to one end of a first resistor, the other end of the first resistor is connected to one end of a first capacitor, the other end of the first capacitor is connected to the other end of the auxiliary winding, and the voltage collector is connected to both ends of the first capacitor.
4. The soft-switching control circuit according to claim 1, wherein one end of the auxiliary winding is connected to one end of a second inductor, the other end of the second inductor is connected to one end of a second resistor, the other end of the second resistor is connected to the other end of the auxiliary winding, and the voltage collector is connected to both ends of the second resistor.
5. The soft-switching control circuit of claim 1, wherein the number of the switching modules is at least two, and each of the switching modules is connected in parallel with each other.
6. The soft-switching control circuit of claim 1, wherein the first switching transistor and the second switching transistor are both MOS transistors.
7. The soft-switching control circuit of claim 1, wherein an input capacitor is connected in series between two input terminals of the soft-switching control circuit.
8. The soft-switching control circuit of claim 1, wherein an output capacitor is connected in series between two output terminals of the soft-switching control circuit.
9. The soft-switching control circuit of claim 1, wherein the auxiliary winding has the same winding polarity as the first inductor.
10. An electrically controlled device comprising a powered device and the soft-switching control circuit of any one of claims 1 to 9;
wherein the power consumption equipment is connected with the soft switch control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122105195.4U CN216056791U (en) | 2021-08-31 | 2021-08-31 | Soft switch control circuit and electric control equipment |
Applications Claiming Priority (1)
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