CN114337200A - Isolation drive circuit, DC conversion circuit and DC conversion device - Google Patents
Isolation drive circuit, DC conversion circuit and DC conversion device Download PDFInfo
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- CN114337200A CN114337200A CN202111504366.9A CN202111504366A CN114337200A CN 114337200 A CN114337200 A CN 114337200A CN 202111504366 A CN202111504366 A CN 202111504366A CN 114337200 A CN114337200 A CN 114337200A
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Abstract
The invention provides an isolation driving circuit, a direct current conversion circuit and a direct current conversion device, wherein the circuit is respectively connected with a control module and two driving switch tubes, the circuit comprises a transformer and two control circuits, and the isolation driving circuit comprises: the transformer is used for receiving the control signal sent by the control module and controlling the running state of the turn-off acceleration module according to the control signal so as to control the on/off of the driving switch tube; the control circuit is used for charging the negative voltage bias module through the turn-off acceleration module or the reverse charging module when any one of the driving switch tubes is switched on. The two driving switch tubes are controlled by the two-way control circuit, so that the negative voltage bias modules in the two-way control circuit are charged simultaneously during the conduction period of any one driving switch tube, and the discharge is only carried out when the two driving switch tubes are simultaneously turned off, so that the bias voltage provided by each control circuit can be maintained.
Description
Technical Field
The present invention relates to the field of circuit control, and in particular, to an isolation driving circuit, a dc conversion circuit, and a dc conversion device.
Background
In order to reduce the cost, a switch tube in a DC-DC conversion circuit in the prior art is usually driven by a transformer in an isolation manner; for a high-power DC-DC conversion circuit, because a switching tube driving signal is easy to be interfered, a negative bias voltage is generally set for the switching tube driving by a capacitor and a voltage regulator tube; when the switching tube is switched on, the capacitor is charged, and when the switching tube is switched off, the capacitor is discharged; however, when the duty ratio of the switching tube driving signal is small, the discharge amount of the capacitor is larger than the charge amount, which causes a problem that the negative bias voltage across the capacitor cannot be maintained.
Disclosure of Invention
The invention mainly aims to provide an isolation driving circuit, a direct current conversion circuit and a direct current conversion device, and aims to solve the problem that a negative bias voltage cannot be maintained when a driving signal of a driving switch tube is smaller in duty ratio in the prior art.
In order to achieve the above object, the present invention provides an isolation driving circuit, which is respectively connected to a control module and a driving switch tube, wherein the circuit includes a transformer and two control circuits, the transformer includes a primary winding and two secondary windings, the primary winding is connected to the control module, each control circuit is correspondingly connected between one driving switch tube and one secondary winding, and the polarities of electric signals received by the two control circuits from the secondary windings are opposite or 0 at the same time; wherein:
the control circuit comprises a turn-off acceleration module, a reverse charging module and a negative voltage bias module, wherein the turn-off acceleration module is connected with the secondary winding, the turn-off acceleration module is also connected with the driving switch tube through the negative voltage bias module, and the reverse charging module is connected between the negative voltage bias module and the secondary winding; wherein:
the transformer is used for receiving the control signal sent by the control module and controlling the running state of the turn-off acceleration module according to the control signal so as to control the on/off of the driving switch tube;
the control circuit is used for charging the negative voltage bias module through the turn-off acceleration module or the reverse charging module when any one of the driving switch tubes is switched on.
Optionally, the turn-off accelerating module includes a first switching tube, a first resistor, and a first diode; wherein:
the positive electrode of the first diode is connected with the first end of the secondary winding, the positive electrode of the first diode is further connected with the control end of the first switch tube through the first resistor, the negative electrode of the first diode is connected with the driving switch tube through the negative pressure bias module, the negative electrode of the first diode is further connected with the input end of the first switch tube, and the output end of the first switch tube is respectively connected with the second end of the secondary winding and the reference end.
Optionally, the first switch tube is a PNP type triode.
Optionally, the negative voltage bias module includes a first zener diode and a first capacitor; wherein:
the negative electrode of the first voltage stabilizing diode is connected with the turn-off accelerating module, the positive electrode of the first voltage stabilizing diode is connected with the driving switch tube, and the first capacitor is connected with the first voltage stabilizing diode in parallel.
Optionally, the reverse charging module includes a second diode, a third diode, and a second zener diode; wherein:
the positive pole of the second diode is connected with the second end of the secondary winding, the negative pole of the second diode is connected between the turn-off acceleration module and the negative bias module, the negative pole of the second voltage stabilizing diode is connected between the negative bias module and the driving end, the positive pole of the second voltage stabilizing diode is connected with the positive pole of the third diode, and the negative pole of the third diode is connected with the first end of the secondary winding.
Optionally, the control circuit further comprises a second resistor; wherein:
the second resistor is connected between the turn-off acceleration module and the negative pressure bias module.
Optionally, the circuit further comprises a second capacitance; wherein:
the second capacitor is connected in series between the control module and the primary winding of the transformer.
In addition, in order to achieve the above object, the present invention further provides a dc conversion circuit, which is characterized in that the dc conversion circuit includes a control module, a driving switch tube, and the isolation driving circuit.
Optionally, the control module is configured to output two control signals with opposite polarities or simultaneously a low level to the primary winding of the transformer, where one of the control signals is used to control on or off of one of the driving switching tubes.
In order to achieve the above object, the present invention also provides a dc converter including a case and the dc converter circuit described above, wherein the dc converter circuit is provided in the case.
The invention provides an isolation driving circuit, a direct current conversion circuit and a direct current conversion device, wherein the circuit is respectively connected with a control module and two driving switch tubes, the circuit comprises a transformer and two control circuits, the transformer comprises a primary winding and two secondary windings, the primary winding is connected with the control module, each control circuit is correspondingly connected between one driving switch tube and one secondary winding, and the polarities of electric signals received by the two control circuits from the secondary windings are opposite or 0 simultaneously; wherein: the control circuit comprises a turn-off acceleration module, a reverse charging module and a negative voltage bias module, wherein the turn-off acceleration module is connected with the secondary winding, the turn-off acceleration module is also connected with the driving switch tube through the negative voltage bias module, and the reverse charging module is connected between the negative voltage bias module and the secondary winding; wherein: the transformer is used for receiving the control signal sent by the control module and controlling the running state of the turn-off acceleration module according to the control signal so as to control the on/off of the driving switch tube; the control circuit is used for charging the negative voltage bias module through the turn-off acceleration module or the reverse charging module when any one of the driving switch tubes is switched on. The two driving switch tubes are controlled by the two-way control circuit, so that the negative voltage bias modules in the two-way control circuit are charged simultaneously during the conduction period of any one driving switch tube, and the discharge is only carried out when the two driving switch tubes are simultaneously turned off, so that the bias voltage provided by each control circuit can be maintained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of an isolation driving circuit according to the present invention;
FIG. 2 is a circuit diagram of an isolation driving circuit applied in the embodiment of FIG. 1;
FIG. 3 is a first voltage flow diagram of the isolation drive circuit of the present invention;
FIG. 4 is a second voltage flow diagram of the isolation drive circuit of the present invention;
FIG. 5 is a third voltage flow diagram of the isolation driving circuit of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Control circuit | R1～R2 | First to |
| 110 | Turn-off acceleration module | C1～C2 | First to |
| 120 | Reverse charging module | D1～D3 | First to |
| 130 | Negative pressure bias module | ZD1～ZD2 | First to second zener diodes |
| T1 | Transformer device | Q1 | First switch tube |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Fig. 1 is a functional block diagram of an embodiment of an isolation driving circuit according to the present invention. In this embodiment, the isolation driving circuit is respectively connected to a control module and a driving switch tube, the circuit includes a transformer T1 and two control circuits 100, the transformer T1 includes a primary winding and two secondary windings, the primary winding is connected to the control module, each control circuit 100 is correspondingly connected between one driving switch tube and one secondary winding, and the polarities of electrical signals received by the two control circuits 100 from the secondary windings are opposite or 0 at the same time; wherein:
the control circuit 100 includes a turn-off acceleration module 110, a reverse charging module 120, and a negative voltage bias module 130, wherein the turn-off acceleration module 110 is connected to the secondary winding, the turn-off acceleration module 110 is further connected to the driving switch tube through the negative voltage bias module 130, and the reverse charging module 120 is connected between the negative voltage bias module 130 and the secondary winding; wherein:
the driving switch tube in the embodiment can be, but is not limited to, a power switch device such as an MOS tube and an IGBT tube; the driving switch tube is used as an MOS tube for explanation, and details are not repeated.
The isolation driving circuit in this embodiment is a two-way transformer T1 isolation driving circuit, that is, two MOS transistors are controlled by two control circuits 100 in one isolation driving circuit; the control module is used for outputting control signals to the MOS tubes, the number of the control modules can be one, the control modules can respectively output control signals to the two MOS tubes, the number of the control modules can also be two, and the control modules respectively output control signals to different MOS tubes through different control modules. The two control signals of the control module are respectively connected to two ends of the primary winding of the transformer T1, and it can be understood that the two ends of the primary winding need to have a voltage difference to operate, and therefore, the polarities of the two control signals need to be set to be opposite or at a low level at the same time. That is, when one path of control signal is at a high level, the other path of control signal must be at a low level, at this time, the MOS transistor corresponding to the control signal at the high level is turned on, and the MOS transistor corresponding to the control signal at the low level is turned off, and when the two paths of control signals are at the low level at the same time, both the MOS transistors are turned off.
Because the two control circuits 100 respectively control one MOS transistor, and because the polarities of the two control signals corresponding to the MOS transistors are opposite or are low levels at the same time, it is necessary to set the polarities of the electrical signals received by the two control circuits 100 from the secondary winding to be opposite or 0 at the same time; specifically, the two control circuits 100 are a first control circuit 100 and a second control circuit 100, respectively, the first control circuit 100 is connected with a first MOS transistor, and the second control circuit 100 is connected with a second MOS transistor; each control circuit 100 comprises two input ends, wherein a first input end of the first control circuit 100 is connected with a homonymous end of the secondary winding, a second input end of the first control circuit 100 is connected with a non-homonymous end of the secondary winding, and a control signal output end corresponding to the first MOS tube in the control module is connected with the homonymous end of the primary winding; a first input end of the second control circuit 100 is connected with a non-homonymous end of the secondary winding, a second input end of the second control circuit 100 is connected with a homonymous end of the secondary winding, and a control signal output end of the control module corresponding to the second MOS tube is connected with the non-homonymous end of the primary winding; thus, it can be ensured that the polarities of the electrical signals received by the two control circuits 100 from the secondary windings are opposite or 0 simultaneously; specifically, taking as an example that the control signal is at a high level to indicate the conduction of the corresponding MOS transistor, the control signal corresponding to the first MOS transistor is a first control signal, and the control signal corresponding to the second MOS transistor is a second control signal; when the first control signal is at a high level, the second control signal is at a low level, the dotted terminal of the primary winding of the transformer T1 is at a high level, the non-dotted terminal is at a low level, the dotted terminal of the secondary winding of the transformer T1 is at a high level, the non-dotted terminal is at a low level, the polarity of the electrical signal received by the first control circuit 100 is positive, and the polarity of the electrical signal received by the second control circuit 100 is negative; when the second control signal is at a high level, the first control signal is at a low level, the dotted terminal of the primary winding of the transformer T1 is at a low level, the non-dotted terminal is at a high level, the dotted terminal of the secondary winding of the transformer T1 is at a low level, the non-dotted terminal is at a high level, the polarity of the electrical signal received by the second control circuit 100 is positive, and the polarity of the electrical signal received by the first control circuit 100 is negative; when the first control signal is at a low level and the second control signal is at a low level, the secondary winding of the transformer T1 outputs an electrical signal of 0.
The control circuit 100 includes two output terminals, one of which is a driving terminal connected to the MOS transistor, and the other of which is a reference terminal connected to the ground.
The transformer T1 is configured to receive the control signal sent by the control module, and control the operating state of the turn-off acceleration module 110 according to the control signal to control the on/off of the MOS transistor;
the turn-off acceleration module 110 is configured to turn on the corresponding MOS transistor when the MOS transistor is turned off, quickly discharge the gate-source capacitance of the MOS transistor to accelerate the turn-off rate of the MOS transistor, and turn off the corresponding MOS transistor when the MOS transistor is turned on, so as to avoid affecting the operating state of the MOS transistor.
The control circuit 100 is configured to charge the negative voltage bias module 130 through the turn-off accelerating module 110 or the reverse charging module 120 when any MOS transistor is turned on.
The negative bias module 130 is configured to improve an anti-interference capability of the MOS transistor, specifically, delay a turn-on time of the MOS transistor, when a control signal of the MOS transistor is a high level, a gate of the MOS transistor receives the high level, if the negative bias module 130 is not configured, a driving voltage of the MOS transistor may oscillate when the MOS transistor is turned off due to leakage inductance of a transformer and parasitic inductance of a driving circuit, and once the driving voltage is higher than a turn-on threshold voltage of the MOS transistor, the MOS transistor may be turned on by mistake, and therefore, is susceptible to interference of signal fluctuation, after the negative bias module 130 is configured, when the control signal is a low level, the gate voltage of the MOS transistor is clamped by the negative bias module 130, and since a voltage generated by oscillation is lower than a turn-on threshold voltage of the MOS transistor after superimposing a negative bias voltage, the MOS transistor may not be turned on by mistake at this time, and therefore, the negative bias module 130 may improve an anti-interference capability of the MOS transistor.
The turn-off acceleration module 110 is configured to charge the connected negative bias module 130 when the signal received from the secondary winding is positive, and the reverse charging module 120 is configured to charge the connected negative bias module 130 when the signal received from the secondary winding is negative.
In the embodiment, the two MOS transistors are controlled by the two-way control circuit 100, so that the negative voltage bias module 130 in the two-way control circuit 100 is charged simultaneously during the conduction period of any one MOS transistor, and only when the two MOS transistors are turned off simultaneously, the discharge is performed, and thus the bias voltage provided by each control circuit 100 can be maintained.
Further, with reference to fig. 2, the turn-off accelerating module 110 includes a first switch Q1, a first resistor R1, and a first diode D1; wherein:
the positive pole of the first diode D1 is connected with the first end of the secondary winding, the positive pole of the first diode D1 is connected with the control end of the first switch tube Q1 through the first resistor R1, the negative pole of the first diode D1 is connected with the MOS tube through the negative bias module 130, the negative pole of the first diode D1 is connected with the input end of the first switch tube Q1, and the output end of the first switch tube Q1 is connected with the second end of the secondary winding and the reference end respectively.
Taking the control circuit 100 as the first control circuit 100, the first switch tube Q1 as a PNP type triode, and the first end of the secondary winding as the homonymy end as an example, the control end of the first switch tube Q1 is the base of the triode, the input end of the triode is the emitter of the triode, and the output end of the triode is the collector of the triode.
When the control signal corresponding to the first MOS tube is at a high level, the control signal corresponding to the second MOS tube is at a low level, the dotted terminal of the secondary winding outputs a high level, the control terminal of the triode is at a high level, and the triode is turned off; at this time, the first diode D1 is turned on, and the negative bias module 130 starts to charge;
when the control signal corresponding to the second MOS transistor is at a high level, the control signal corresponding to the first MOS transistor is at a low level, the dotted terminal of the secondary winding outputs a low level, the non-dotted terminal of the secondary winding outputs a high level, and the first diode D1 is turned off to stop charging the negative bias module 130; the control end of the triode is at a low level, but the collector voltage of the triode is greater than the emitter voltage due to the unidirectional conductivity of the triode, and the triode is not conducted;
when the control signal corresponding to the first MOS transistor is at a low level and the control signal corresponding to the second MOS transistor is at a low level, the output electrical signal of the dotted terminal of the secondary winding is 0, and the first diode D1 is turned off, and stops charging the negative voltage bias module 130; the control end of the triode is at low level, and the triode is conducted.
In the second control circuit 100 or other commonly used setting circuits, corresponding descriptions can be performed according to the above contents, and are not described herein again.
Further, the negative bias module 130 includes a first zener diode ZD1 and a first capacitor C1; wherein:
the cathode of the first zener diode ZD1 is connected to the turn-off accelerating module 110, the anode of the first zener diode ZD1 is connected to the MOS transistor, and the first capacitor C1 is connected in parallel to the first zener diode ZD 1.
Taking the control circuit 100 as the first control circuit 100 and the first end of the secondary winding as the end with the same name as the control circuit 100 as an example;
when the control signal corresponding to the first MOS transistor is at a high level, the control signal corresponding to the second MOS transistor is at a low level, the high level is output by the dotted terminal of the secondary winding, and at this time, the first capacitor C1 is charged by turning off the acceleration module 110, and the first MOS transistor is turned on;
when the control signal corresponding to the second MOS transistor is at a high level, the control signal corresponding to the first MOS transistor is at a low level, the dotted terminal of the secondary winding outputs a low level, the first capacitor C1 is charged through the reverse charging module 120, the gate voltage of the first MOS transistor is clamped to the voltage stabilizing value of the first voltage stabilizing diode ZD1, and the first MOS transistor is turned off.
When the control signal corresponding to the first MOS transistor is at a low level and the control signal corresponding to the second MOS transistor is at a low level, the output electrical signal of the dotted terminal of the secondary winding is 0, and at this time, since the turn-off acceleration module 110 is turned on, the voltage of the first capacitor C1 is discharged through the turn-off acceleration module 110, and the first MOS transistor is turned off.
In the second control circuit 100 or other commonly used setting circuits, corresponding descriptions can be performed according to the above contents, and are not described herein again.
Further, the reverse charging module 120 includes a second diode D2, a third diode D3, and a second zener diode ZD 2; wherein:
the anode of the second diode D2 is connected to the second end of the secondary winding, the cathode of the second diode D2 is connected between the turn-off accelerating module 110 and the negative bias module 130, the cathode of the second zener diode ZD2 is connected between the negative bias module 130 and the driving end, the anode of the second zener diode ZD2 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the first end of the secondary winding.
Taking the control circuit 100 as the first control circuit 100 and the first end of the secondary winding as the end with the same name as the control circuit 100 as an example;
when the control signal corresponding to the first MOS transistor is at a high level, the control signal corresponding to the second MOS transistor is at a low level, the non-dotted terminal of the secondary winding outputs a low level, the second diode D2, the third diode D3, and the second zener diode ZD2 are turned off, and the reverse charging module 120 does not operate;
when the control signal corresponding to the second MOS transistor is at a high level, the control signal corresponding to the first MOS transistor is at a low level, the non-dotted terminal of the secondary winding outputs a high level, the second diode D2, the third diode D3 and the second zener diode ZD2 are turned on to form a loop, and the negative bias module 130 starts to charge;
when the control signal corresponding to the first MOS transistor is at a low level and the control signal corresponding to the second MOS transistor is at a low level, the output electrical signal of the same-name end of the secondary winding is 0, the second diode D2, the third diode D3, and the second zener diode ZD2 are turned off, and the reverse charging module 120 does not operate.
In the second control circuit 100 or other commonly used setting circuits, corresponding descriptions can be performed according to the above contents, and are not described herein again.
Further, the control circuit 100 further includes a second resistor R2; wherein:
the second resistor R2 is connected between the turn-off acceleration module 110 and the negative bias module 130.
The second resistor R2 is a drive current limiting resistor. Specifically, the turn-off acceleration module 110 and the reverse charging module 120 are connected to a first end of the second resistor R2, and the negative bias module 130 is connected to a second end of the second resistor R2.
Further, the circuit also comprises a second capacitor C2; wherein:
the second capacitor C2 is connected in series between the control module and the primary winding of the transformer T1.
The second capacitor C2 is a dc blocking capacitor for demagnetizing the magnetic core to avoid magnetic bias.
The overall control principle of the isolation driving circuit of the present invention is described by taking the control circuit 100 as the first control circuit 100, the first switching tube Q1 as a PNP type triode, and the first end of the secondary winding as the same name end:
referring to fig. 3, when the control signal corresponding to the first MOS transistor is at a high level, the control signal corresponding to the second MOS transistor is at a low level, the dotted terminal of the secondary winding outputs a high level, and the non-dotted terminal of the secondary winding outputs a low level; at this time, the control end of the triode is at a high level, the triode is turned off, the first diode D1 is turned on, the drive end outputs the high level, the gate-source capacitor of the first MOS transistor starts to charge, the first zener diode ZD1 clamps the first capacitor C1 to the regulated voltage value of the first zener diode ZD1, and the first capacitor C1 is continuously charged; the second diode D2, the third diode D3 and the second zener diode ZD2 are turned off, and the reverse charging module 120 does not operate;
referring to fig. 4, when the control signal corresponding to the second MOS transistor is at a high level, the control signal corresponding to the first MOS transistor is at a low level, the dotted terminal of the secondary winding outputs a low level, and the non-dotted terminal of the secondary winding outputs a high level; at this time, the triode is not turned on, the first diode D1 is turned off, the driving terminal is clamped to the negative bias voltage of the first capacitor C1, the second diode D2, the third diode D3 and the second zener diode ZD2 are turned on to form a loop, and the first capacitor C1 is continuously charged;
referring to fig. 5, when the control signal corresponding to the first MOS transistor is at a low level and the control signal corresponding to the second MOS transistor is at a low level, the output electrical signal of the dotted terminal of the secondary winding is 0; at this time, the first diode D1 is turned off, the control terminal of the triode is at a low level, the triode is turned on, the gate-source capacitor of the first MOS transistor discharges through the negative bias module 130 and the triode to accelerate the turn-off, meanwhile, the driving terminal is clamped to the negative bias voltage of the first capacitor C1, the first capacitor C1 continuously discharges, the second diode D2, the third diode D3 and the second zener diode ZD2 are turned off, and the reverse charging module 120 does not work.
It should be noted that, let the high level output of the secondary winding be Vt, the forward conduction voltage drop of the first diode D1 be Vd1, in this embodiment, Vd1 is 0.3V, the first zener diode ZD1 is Vzd, and the driving end high level is Vt-0.3V-Vzd; the low level output of the secondary winding is set as-Vt, the conduction voltage drop of the second diode D2 is Vd2, Vd2 is 0.3V in this embodiment, the conduction voltage drop of the third diode D3 is Vd3, and Vd3 is 0.3V in this embodiment, therefore, the value of the second zener diode ZD2 should be slightly less than Vt-0.3V-Vzd-0.3V.
In addition, the present invention also provides a dc conversion circuit, which is characterized in that the dc conversion circuit includes a control module, an MOS transistor and an isolation driving circuit, and the structure of the isolation driving circuit may refer to the above embodiments, and is not described herein again. It should be noted that, since the dc conversion circuit of the present embodiment adopts the technical solution of the isolation driving circuit, the dc conversion circuit has all the beneficial effects of the isolation driving circuit.
Further, the control module is configured to output two control signals with opposite polarities or low levels to the primary winding of the transformer, where one control signal is used to control the on/off of one MOS transistor.
The present invention also provides a dc conversion device, which includes a housing and a dc conversion circuit, wherein the dc conversion circuit is disposed in the housing, and the structure of the dc conversion circuit can refer to the above embodiments, and is not described herein again. It should be noted that, since the dc conversion device of the present embodiment adopts the technical solution of the dc conversion circuit, the dc conversion device has all the advantages of the dc conversion circuit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the group of processes, methods, articles, or systems that include the element. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An isolation driving circuit is characterized in that the circuit is respectively connected with a control module and two driving switch tubes, the circuit comprises a transformer and two control circuits, the transformer comprises a primary winding and two secondary windings, the primary winding is connected with the control module, each control circuit is correspondingly connected between one driving switch tube and one secondary winding, and the polarities of electric signals received by the two control circuits from the secondary windings are opposite or 0 at the same time; wherein:
the control circuit comprises a turn-off acceleration module, a reverse charging module and a negative voltage bias module, wherein the turn-off acceleration module is connected with the secondary winding, the turn-off acceleration module is also connected with the driving switch tube through the negative voltage bias module, and the reverse charging module is connected between the negative voltage bias module and the secondary winding; wherein:
the transformer is used for receiving the control signal sent by the control module and controlling the running state of the turn-off acceleration module according to the control signal so as to control the on/off of the driving switch tube;
the control circuit is used for charging the negative voltage bias module through the turn-off acceleration module or the reverse charging module when any one of the driving switch tubes is switched on.
2. The isolated driving circuit according to claim 1, wherein the turn-off accelerating module comprises a first switching tube, a first resistor and a first diode; wherein:
the positive electrode of the first diode is connected with the first end of the secondary winding, the positive electrode of the first diode is further connected with the control end of the first switch tube through the first resistor, the negative electrode of the first diode is connected with the driving switch tube through the negative pressure bias module, the negative electrode of the first diode is further connected with the input end of the first switch tube, and the output end of the first switch tube is respectively connected with the second end of the secondary winding and the reference end.
3. The isolated driving circuit of claim 2, wherein the first switching transistor is a PNP transistor.
4. The isolated driver circuit of claim 1, wherein the negative bias module comprises a first zener diode and a first capacitor; wherein:
the negative electrode of the first voltage stabilizing diode is connected with the turn-off accelerating module, the positive electrode of the first voltage stabilizing diode is connected with the driving switch tube, and the first capacitor is connected with the first voltage stabilizing diode in parallel.
5. The isolated drive circuit of claim 1, wherein the reverse charging module comprises a second diode, a third diode, and a second zener diode; wherein:
the positive pole of the second diode is connected with the second end of the secondary winding, the negative pole of the second diode is connected between the turn-off acceleration module and the negative bias module, the negative pole of the second voltage stabilizing diode is connected between the negative bias module and the driving end, the positive pole of the second voltage stabilizing diode is connected with the positive pole of the third diode, and the negative pole of the third diode is connected with the first end of the secondary winding.
6. The isolated drive circuit of claim 1, wherein the control circuit further comprises a second resistor; wherein:
the second resistor is connected between the turn-off acceleration module and the negative pressure bias module.
7. The isolated driver circuit of claim 1, wherein the circuit further comprises a second capacitor; wherein:
the second capacitor is connected in series between the control module and the primary winding of the transformer.
8. A DC conversion circuit, characterized in that the DC conversion circuit comprises a control module, a driving switch tube and an isolation driving circuit as claimed in any one of claims 1-6.
9. The dc conversion circuit of claim 8, wherein the control module is configured to output two control signals with opposite polarities or simultaneously low levels to the primary winding of the transformer, and one of the control signals is configured to control one of the driving switch tubes to be turned on or off.
10. A dc converter device comprising a housing and a dc conversion circuit according to claim 8 or 9, the dc conversion circuit being provided in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111504366.9A CN114337200B (en) | 2021-12-09 | 2021-12-09 | Isolation drive circuit, direct current conversion circuit and direct current conversion device |
Applications Claiming Priority (1)
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| CN202111504366.9A CN114337200B (en) | 2021-12-09 | 2021-12-09 | Isolation drive circuit, direct current conversion circuit and direct current conversion device |
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| CN114337200A true CN114337200A (en) | 2022-04-12 |
| CN114337200B CN114337200B (en) | 2023-02-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116260321A (en) * | 2023-05-16 | 2023-06-13 | 杭州锐健医疗科技有限公司 | MOS tube driving circuit, switching power supply and ablation equipment |
| CN117155078A (en) * | 2023-10-30 | 2023-12-01 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800293A (en) * | 2016-08-29 | 2018-03-13 | 丰郅(上海)新能源科技有限公司 | A kind of drive circuit and the photovoltaic power optimization system using the drive circuit |
| CN213426015U (en) * | 2020-10-23 | 2021-06-11 | 深圳市华瑞新能源技术有限公司 | Drive circuit that transformer was kept apart |
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2021
- 2021-12-09 CN CN202111504366.9A patent/CN114337200B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800293A (en) * | 2016-08-29 | 2018-03-13 | 丰郅(上海)新能源科技有限公司 | A kind of drive circuit and the photovoltaic power optimization system using the drive circuit |
| CN213426015U (en) * | 2020-10-23 | 2021-06-11 | 深圳市华瑞新能源技术有限公司 | Drive circuit that transformer was kept apart |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116260321A (en) * | 2023-05-16 | 2023-06-13 | 杭州锐健医疗科技有限公司 | MOS tube driving circuit, switching power supply and ablation equipment |
| CN117155078A (en) * | 2023-10-30 | 2023-12-01 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
| CN117155078B (en) * | 2023-10-30 | 2024-01-30 | 江苏天合储能有限公司 | Control circuit and control method of power module and power module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114337200B (en) | 2023-02-10 |
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