CN111817545A - Driving dead zone detection circuit, peak absorption circuit and switching tube protection circuit - Google Patents
Driving dead zone detection circuit, peak absorption circuit and switching tube protection circuit Download PDFInfo
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- CN111817545A CN111817545A CN202010724872.8A CN202010724872A CN111817545A CN 111817545 A CN111817545 A CN 111817545A CN 202010724872 A CN202010724872 A CN 202010724872A CN 111817545 A CN111817545 A CN 111817545A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
Abstract
The invention relates to the technical field of electronic circuits, in particular to a driving dead zone detection circuit, a peak absorption circuit and a switch tube protection circuit, wherein the dead zone detection circuit comprises an OR gate circuit and a signal conversion circuit, two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switch tubes of a push-pull circuit and are used for detecting two paths of driving signals input by the two switch tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal; the signal conversion circuit is used for carrying out signal conversion on a level control signal output by the OR gate circuit to obtain a dead zone signal for representing dead zone time, the dead zone time in the push-pull circuit can be accurately detected through the dead zone detection circuit, and technicians can conveniently suppress and absorb spike voltage generated in the push-pull circuit.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a driving dead zone detection circuit, a peak absorption circuit and a switching tube protection circuit.
Background
In the elevator control field, fall the electricity for coping with the electric wire netting, often need be equipped with the power failure emergency device and guarantee to fall the back elevator can normally move to safe position after the electricity, avoid the elevator to stop in illegal region, produce the potential safety hazard, and fall the electricity at the commercial power and then the work of arbitrary holding elevator, then need add external power source, generally adopt the mode that the battery rose, make the elevator can the short time operation. The primary voltage of a push-pull circuit (also called a booster circuit) is low, and the withstand voltage of a selected switching tube is correspondingly low, so that the peak voltage received when the switching tube is switched on and off is high, and the switching tube is easy to fail and damage, so that the switching tube needs to be protected, the dead time of the booster circuit is generally detected firstly, and then the peak is restrained in the dead time. At present, an effective means aiming at the dead zone detection of the booster circuit is lacked in the prior art, so that the dead zone time detection is inaccurate.
Disclosure of Invention
The invention mainly solves the technical problem that the dead time detection is inaccurate due to the lack of an effective means for the dead time detection of the booster circuit in the prior art.
A driving dead zone detection circuit for detecting a dead zone signal of a push-pull circuit, the push-pull circuit including two switching tubes, the dead zone detection circuit comprising: an OR gate circuit and a signal conversion circuit;
two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switching tubes of the push-pull circuit and are used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal;
the signal conversion circuit is used for performing signal conversion on the level control signal output by the OR gate circuit and outputting a dead zone signal for representing dead zone time.
The OR gate circuit comprises two driving signal detection circuits, the signal input ends of the two driving signal detection circuits are respectively two signal input ends of the OR gate circuit, and the signal output ends of the two driving signal detection circuits are connected together to form a signal output end of the OR gate circuit and used for outputting the level control signal.
In one embodiment, the driving signal detection circuit includes a first resistor, a first diode, and a first capacitor, one end of the first resistor is a signal input end of the driving signal detection circuit, the other end of the first resistor is connected to an anode of the first diode, a cathode of the first diode is a signal output end of the driving signal detection circuit, one end of the first capacitor is connected to one end of the first resistor, and the other end of the first capacitor is connected to a cathode of the first diode.
In one embodiment, the signal conversion circuit includes a first transistor, a second diode, a second resistor, a third resistor, a fourth resistor, a third diode, a second capacitor, a dead zone signal output terminal;
the first transistor and the second transistor respectively comprise a control electrode, a first electrode and a second electrode, the control electrode of the first transistor is connected with the signal output end of the OR gate circuit, the first electrode of the first transistor is grounded, the second electrode of the first transistor is connected with the control electrode of the second transistor, one end of the second resistor is connected with the control electrode of the first transistor, and the other end of the second resistor is connected with the first electrode of the first transistor; a first pole of the second transistor is connected to the dead zone signal output terminal, the dead zone signal output terminal is configured to output the dead zone signal, a second pole of the second transistor is connected to a negative pole of the third diode through the third resistor, a positive pole of the third diode is connected to a high level, one end of the fourth resistor is connected to a control pole of the second transistor, the other end of the fourth resistor is connected to a negative pole of the third diode, a positive pole of the second diode is connected to the first pole of the second transistor, and the negative pole of the second diode is connected to the second pole of the first transistor; one end of the second capacitor is connected with the negative electrode of the third diode, and the other end of the second capacitor is grounded.
In one embodiment, the signal conversion circuit further includes a fourth diode, the fourth diode is connected in parallel with the third diode, the second pole of the second transistor is further connected to the cathode of the fourth diode through the third resistor, and the anode of the fourth diode is also connected to a high level.
In one embodiment, the signal conversion circuit further comprises a fifth resistor and a sixth resistor, and the fifth resistor and the sixth resistor are connected in parallel with the fourth resistor.
The peak absorption circuit comprises a control signal input end, a peak voltage input end and a peak voltage output end;
the peak voltage input end is connected with the push-pull circuit, the control signal input end is connected with a dead zone signal output terminal of the dead zone detection circuit and used for receiving a dead zone signal output by the dead zone signal output terminal, and the peak voltage output end is connected with the input end of a battery power supply;
the peak absorption circuit is used for enabling the peak voltage input end and the peak voltage output end to be conducted under the driving of the dead zone signal, and inputting the peak voltage of the push-pull circuit into the battery power supply.
In one embodiment, the spike absorption circuit further comprises a third transistor, a seventh resistor, an eighth resistor;
the first pole of the third transistor is a peak voltage input end of the peak absorption circuit, and is connected with the push-pull circuit, the second pole thereof is a peak voltage output end of the peak absorption circuit, and is connected with the input end of the battery power supply, the control pole of the third transistor is connected with the dead zone signal output terminal through the seventh resistor, one end of the eighth resistor is connected with the control pole of the third transistor, and the other end is connected with the peak voltage output end.
A switching tube protection circuit for detecting dead time of a push-pull circuit and absorbing spike voltage at the dead time, comprising: the circuit comprises a dead zone detection circuit and a spike absorption circuit, wherein the dead zone detection circuit is used for detecting the dead zone time of the push-pull circuit and outputting a dead zone signal for representing the dead zone time, and the spike absorption circuit is used for conducting under the driving of the dead zone signal to absorb the spike voltage of the push-pull circuit.
Wherein the dead zone detection circuit includes: an OR gate circuit and a signal conversion circuit;
two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switching tubes of the push-pull circuit and are used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal;
the signal conversion circuit is used for performing signal conversion on the level control signal output by the OR gate circuit to obtain the dead zone signal;
the peak absorption circuit comprises a control signal input end, a peak voltage input end and a peak voltage output end; the peak voltage input end is connected with the push-pull circuit, the control signal input end is connected with the output end of the signal conversion circuit to receive the dead zone signal, and the peak voltage output end is connected with the input end of a battery power supply;
the peak absorption circuit is used for enabling the peak voltage input end and the peak voltage output end to be conducted under the driving of the dead zone signal, and inputting the peak voltage of the push-pull circuit into the battery power supply.
In one embodiment, the spike absorption circuit further comprises a third transistor, a seventh resistor, an eighth resistor;
the first pole of the third transistor is a peak voltage input end of the peak absorption circuit, and is connected with the push-pull circuit, the second pole thereof is a peak voltage output end of the peak absorption circuit, and is connected with the input end of the battery power supply, the control pole of the third transistor is connected with the dead zone signal output terminal through the seventh resistor, one end of the eighth resistor is connected with the control pole of the third transistor, and the other end is connected with the peak voltage output end.
The driving dead zone detection circuit according to the embodiment comprises an or gate circuit and a signal conversion circuit, wherein two signal input ends of the or gate circuit are respectively connected with control electrodes of two switching tubes of a push-pull circuit and used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal; the signal conversion circuit is used for carrying out signal conversion on a level control signal output by the OR gate circuit to obtain a dead zone signal for representing dead zone time, the dead zone time in the push-pull circuit can be accurately detected through the dead zone detection circuit, and technicians can conveniently suppress and absorb spike voltage generated in the push-pull circuit.
Drawings
Fig. 1 is a schematic structural diagram of a switching tube protection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a dead zone detection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a peak absorption circuit according to an embodiment of the present disclosure.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning.
A push-pull circuit is an output circuit connected between two transistors with different polarities. The push-pull circuit adopts two power BJT (bipolar junction transistor) tubes or MOSFET (metal-oxide-semiconductor field effect transistor) tubes with the same parameters, the two power BJT tubes or MOSFET tubes exist in the circuit in a push-pull mode, and are respectively responsible for positive and negative half-cycle waveform amplification tasks. The push-pull output can both sink current to the load and draw current from the load.
The transistor of this embodiment is a three-terminal transistor, and its three terminals are a control electrode, a first electrode and a second electrode. The transistor may be a bipolar transistor, a field effect transistor, or the like. For example, when the transistor is a bipolar transistor, the control electrode of the transistor refers to a base electrode of the bipolar transistor, the first electrode may be a collector or an emitter of the bipolar transistor, and the corresponding second electrode may be an emitter or a collector of the bipolar transistor; when the transistor is a field effect transistor, the control electrode refers to a gate electrode of the field effect transistor, the first electrode may be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be a source electrode or a drain electrode of the field effect transistor.
In the embodiment of the invention, the driving dead zone detection circuit comprises an OR gate circuit and a signal conversion circuit, wherein two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switching tubes of a push-pull circuit and are used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal; the signal conversion circuit is used for carrying out signal conversion on a level control signal output by the OR gate circuit to obtain a dead zone signal for representing dead zone time, the dead zone time in the push-pull circuit can be accurately detected through the dead zone detection circuit, and technicians can conveniently suppress and absorb spike voltage generated in the push-pull circuit.
Furthermore, the application also provides a peak absorption circuit and a peak absorption circuit, as shown in fig. 1, the dead zone detection circuit 2 is used for detecting the dead zone time of the push-pull circuit 1 and outputting a dead zone signal for representing the dead zone time, the peak absorption circuit 3 is used for conducting under the driving of the dead zone signal output by the dead zone detection circuit to absorb the peak voltage of the push-pull circuit 1 and inputting the peak voltage to the battery power supply 4, so that the switching tube works within the rated voltage range, the device can be ensured to work effectively and reliably for a long time, and the service life of the device is prolonged.
The first embodiment is as follows:
referring to fig. 1, a driving dead zone detection circuit for detecting a dead zone signal of a push-pull circuit, the dead zone detection circuit of the present embodiment includes: an or gate circuit 21 and a signal conversion circuit 22. Two signal input ends of the or gate circuit 21 are DRV _ a1 and DRV _ B1, DRV _ a1 and DRV _ B1 are respectively connected to control electrodes of two switching tubes of the push-pull circuit, and are used for detecting high and low level signals of two paths of PWM driving signals input by the two switching tubes. Meanwhile, the or gate circuit 21 is configured to perform an or gate operation on the two driving signals (specifically, high and low level signals) and output a level control signal. The signal conversion circuit 22 is configured to perform signal conversion on the level control signal output from the or gate circuit 21 to output a dead time signal indicating a dead time.
As shown in fig. 2, the or gate circuit 21 of the present embodiment includes two driving signal detecting circuits 211, signal input terminals of the two driving signal detecting circuits are two signal input terminals of the or gate circuit 21, i.e. DRV _ a1 and DRV _ B1, respectively, and signal output terminals of the two driving signal detecting circuits 211 are subjected to an or gate operation to form a signal output terminal of the or gate circuit 21 for outputting a level control signal, where the level control signal of the present embodiment includes a high level signal and a low level signal.
Specifically, the two driving signal detecting circuits of the present embodiment have the same structure, as shown in fig. 2, one of the driving signal detecting circuits includes a first resistor R144, a first diode D34 and a first capacitor C80, one end of the first resistor R144 is a signal input end of the driving signal detecting circuit, i.e., DRV _ B1, the other end is connected to an anode of the first diode D34, a cathode of the first diode D34 is a signal output end of the driving signal detecting circuit 211, one end of the first capacitor C80 is connected to one end of the first resistor R144, and the other end is connected to a cathode of the first diode D34. Similarly, the other driving signal detection circuit comprises a resistor R145, a diode D33 and a capacitor C81, one end of the resistor R145 is a signal input end of the driving signal detection circuit, i.e., DRV _ a1, the other end of the resistor R145 is connected to the anode of the diode D33, the cathode of the diode D33 is a signal output end of the driving signal detection circuit, one end of the capacitor C81 is connected to one end of the resistor R145, and the other end of the capacitor C81 is connected to the cathode of the diode D33.
Specifically, as shown in fig. 2, the signal conversion circuit of the present embodiment includes a first transistor Q27, a second transistor Q21, a second diode D35, a second resistor R170, a third resistor R186, a fourth resistor R149, a third diode D29, a second capacitor C70, and a dead zone signal output terminal DRV _ C. The first transistor Q27 and the second transistor Q21 each include a control electrode for controlling on/off thereof, a first electrode and a second electrode, the control electrode of the first transistor Q27 and the signal output terminal of the or gate 21 are connected, the first electrode thereof is grounded, the second electrode thereof is connected with the control electrode of the second transistor Q21, one end of the second resistor R170 is connected with the control electrode of the first transistor Q27, and the other end thereof is connected with the first electrode of the first transistor Q27; a first pole of the second transistor Q21 is connected to a dead zone signal output terminal DRV _ C for outputting a dead zone signal, a second pole of the second transistor Q21 is connected to a negative pole of a third diode D29 through a third resistor R186, a positive pole of the third diode D29 is connected to a high level, for example, the positive pole of the third diode D29 is connected to a +24V voltage in the present embodiment, one end of a fourth resistor R149 is connected to a control pole of the second transistor Q21, the other end is connected to a negative pole of a third diode D29, a positive pole of the second diode D35 is connected to a first pole of the second transistor Q21, and the negative pole is connected to a second pole of the first transistor Q27; one end of the second capacitor C70 is connected to the cathode of the third diode D29 (i.e., the upper end of the third resistor R186), and the other end is grounded.
In this embodiment, since the fourth resistor R149 has a relatively large resistance, the fifth resistor R171 and the sixth resistor R172 are connected in parallel to the two ends of the fourth resistor R149.
For example, in another embodiment, the signal conversion circuit further includes a fourth diode, the fourth diode is connected in parallel with the third diode D29, the second pole of the second transistor Q21 is further connected to the cathode of the fourth diode through the third resistor R186, and the anodes of the fourth diodes are both connected to the high level 24V.
In this embodiment, the first transistor Q27 and the second transistor Q21 both use NPN transistors, and the control electrode is a base electrode, the first electrode is an emitter electrode, and the second electrode is a collector electrode. DRV _ A1 and DRV _ B1 are input as two complementary driving signals, the high level is effective, the current is input from DRV _ A1 and DRV _ B1 ends through a diode composition OR gate 21, when DRV _ A1 is high and DRV _ B1 is low or DRV _ A1 is low and DRV _ B1 is high, a first transistor Q27 is conducted, a second transistor Q21 is turned off, DRV _ C is pulled down through a second diode D35 and a first transistor Q27 and outputs the low level, when the input of DRV _ A1 and DRV _ B1 ends are simultaneously at the low level, namely dead time, the first transistor Q27 is turned off, the first transistor Q21 is conducted at the moment, and the DRV _ C end is pulled up through a first transistor Q21. Thus, when the inputs of the input terminals DRV _ a1, DRV _ B1 are not low at the same time, the output terminal DRV _ C is low, and when the inputs of DRV _ a1, DRV _ B1 are low at the same time, the output terminal DRV _ C is high, that is, when the output terminal DRV _ C is high, it is confirmed that the dead time is detected, thereby achieving the purpose of accurately detecting the dead time.
Example two
On the basis of the first embodiment, as shown in fig. 3, the present embodiment provides a peak absorption circuit for absorbing a peak voltage of a push-pull circuit, where the peak absorption circuit includes a control signal input terminal, a peak voltage input terminal DRV _ D, and a peak voltage output terminal BAT _ VCC; the peak voltage input terminal DRV _ D is connected to the push-pull circuit 1, the control signal input terminal is connected to the dead zone signal output terminal DRV _ C of the dead zone detection circuit, and is configured to receive the dead zone signal output from the dead zone signal output terminal DRV _ C, and the peak voltage output terminal BAT _ VCC is connected to the input terminal of the battery power supply 4. The peak absorption circuit is used for enabling a peak voltage input end DRV _ D and a peak voltage output end BAT _ VCC to be conducted under the driving of the dead zone signal, and inputting the peak voltage of the push-pull circuit 1 into the battery power supply 4 so as to absorb and inhibit the peak voltage of the push-pull circuit.
The spike absorption circuit of the present embodiment further includes a third transistor Q24, a seventh resistor R147, and an eighth resistor R146; the first electrode of the third transistor Q24 is a spike voltage input end DRV _ D of the spike absorption circuit, DRV _ D is connected with the push-pull circuit, and specifically connected in a loop at the boost side of the push-pull circuit, two diodes arranged in opposite directions are connected in series in the loop of the push-pull circuit, and the two diodes are alternately conducted in each conduction period to realize current reversal. The second pole of the third transistor Q24 is a spike voltage output terminal BAT _ VCC of the spike absorption circuit, the BAT _ VCC is connected to the input terminal of the battery power supply 4, the control pole of the third transistor Q24 is connected to the dead zone signal output terminal DRV _ C through the seventh resistor R147, one end of the eighth resistor R146 is connected to the control pole of the third transistor Q24, and the other end is connected to the spike voltage output terminal BAT _ VCC. When the driving is in a dead zone, the primary coil of the transformer is connected to the Q24 through the diodes D25 and D26, at the moment, DRV _ C is at a high level, the third transistor Q24 is conducted, and spike voltage is input into the battery power supply 4 through the third transistor Q24 and BAT _ VCC, so that the effect of spike absorption suppression is achieved.
EXAMPLE III
This embodiment provides a switch tube protection circuit, mainly used detects the dead time of push-pull circuit and absorbs the spike voltage at the dead time to realize that switch tube spike voltage absorbs, make the switch tube work within the rated voltage scope, guarantee that the device can effectively reliably work for a long time, as fig. 1, this switch tube protection circuit includes: the circuit comprises a dead zone detection circuit 2 and a peak absorption circuit 3, wherein the dead zone detection circuit 2 is used for detecting the dead zone time of the push-pull circuit 1 and outputting a dead zone signal for representing the dead zone time, the peak absorption circuit 3 is used for conducting under the driving of the dead zone signal and inputting the peak voltage of the push-pull circuit into a battery power supply 4 so as to absorb the peak voltage of the push-pull circuit 1, so that a switching tube in the push-pull circuit works within a rated voltage range, and the device can effectively and reliably work for a long time.
The circuit structures of the dead zone detection circuit 2 and the spike absorption circuit 3 are the same as those provided in the first and second embodiments, and are not described herein again.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A driving dead zone detection circuit for detecting a dead zone signal of a push-pull circuit, the push-pull circuit including two switching tubes, the dead zone detection circuit comprising: an OR gate circuit and a signal conversion circuit;
two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switching tubes of the push-pull circuit and are used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal;
the signal conversion circuit is used for performing signal conversion on the level control signal output by the OR gate circuit and outputting a dead zone signal for representing dead zone time.
2. The driving dead zone detecting circuit according to claim 1, wherein the or gate circuit includes two driving signal detecting circuits, signal input terminals of the two driving signal detecting circuits are two signal input terminals of the or gate circuit, respectively, and signal output terminals of the two driving signal detecting circuits are connected to form a signal output terminal of the or gate circuit for outputting the level control signal.
3. The driving dead zone detection circuit according to claim 2, wherein the driving signal detection circuit includes a first resistor, a first diode, and a first capacitor; one end of the first resistor is a signal input end of the driving signal detection circuit, and the other end of the first resistor is connected with the anode of the first diode; the cathode of the first diode is a signal output end of the driving signal detection circuit; one end of the first capacitor is connected with one end of the first resistor, and the other end of the first capacitor is connected with the negative electrode of the first diode.
4. The drive dead zone detection circuit according to claim 1, wherein the signal conversion circuit includes a first transistor, a second diode, a second resistor, a third resistor, a fourth resistor, a third diode, a second capacitor, a dead zone signal output terminal;
the first transistor and the second transistor respectively comprise a control electrode, a first electrode and a second electrode, the control electrode of the first transistor is connected with the signal output end of the OR gate circuit, the first electrode of the first transistor is grounded, the second electrode of the first transistor is connected with the control electrode of the second transistor, one end of the second resistor is connected with the control electrode of the first transistor, and the other end of the second resistor is connected with the first electrode of the first transistor; a first pole of the second transistor is connected to the dead zone signal output terminal, the dead zone signal output terminal is configured to output the dead zone signal, a second pole of the second transistor is connected to a negative pole of the third diode through the third resistor, a positive pole of the third diode is connected to a high level, one end of the fourth resistor is connected to a control pole of the second transistor, the other end of the fourth resistor is connected to a negative pole of the third diode, a positive pole of the second diode is connected to the first pole of the second transistor, and the negative pole of the second diode is connected to the second pole of the first transistor; one end of the second capacitor is connected with the negative electrode of the third diode, and the other end of the second capacitor is grounded.
5. The driving dead zone detection circuit according to claim 4, wherein the signal conversion circuit further includes a fourth diode connected in parallel with the third diode, the second pole of the second transistor is further connected to a negative pole of the fourth diode through the third resistor, and an anode of the fourth diode is also connected high.
6. The drive dead band detection circuit of claim 4, wherein the signal conversion circuit further comprises a fifth resistor and a sixth resistor, each of the fifth resistor and the sixth resistor being connected in parallel with the fourth resistor.
7. A switching tube protection circuit for detecting dead time of a push-pull circuit and absorbing spike voltage at the dead time, comprising: the circuit comprises a dead zone detection circuit and a spike absorption circuit, wherein the dead zone detection circuit is used for detecting the dead zone time of the push-pull circuit and outputting a dead zone signal for representing the dead zone time, and the spike absorption circuit is used for conducting under the driving of the dead zone signal to absorb the spike voltage of the push-pull circuit.
8. The switch tube protection circuit of claim 7, wherein the dead band detection circuit comprises: an OR gate circuit and a signal conversion circuit;
two signal input ends of the OR gate circuit are respectively connected with control electrodes of two switching tubes of the push-pull circuit and are used for detecting two paths of driving signals input by the two switching tubes; the OR gate circuit is used for carrying out OR gate operation on the two paths of driving signals and outputting a level control signal;
the signal conversion circuit is used for performing signal conversion on the level control signal output by the OR gate circuit to obtain the dead zone signal.
9. The switch tube protection circuit of claim 8, wherein the spike absorption circuit comprises a control signal input, a spike voltage input, and a spike voltage output;
the peak voltage input end is connected with the push-pull circuit, the control signal input end is connected with the output end of the signal conversion circuit to receive the dead zone signal, and the peak voltage output end is connected with the input end of a battery power supply;
the peak absorption circuit is used for enabling the peak voltage input end and the peak voltage output end to be conducted under the driving of the dead zone signal, and inputting the peak voltage of the push-pull circuit into the battery power supply.
10. The switch tube protection circuit of claim 9, wherein the spike absorbing circuit further comprises a third transistor, a seventh resistor, an eighth resistor;
the first pole of the third transistor is a peak voltage input end of the peak absorption circuit, and is connected with the push-pull circuit, the second pole thereof is a peak voltage output end of the peak absorption circuit, and is connected with the input end of the battery power supply, the control pole of the third transistor is connected with the dead zone signal output terminal through the seventh resistor, one end of the eighth resistor is connected with the control pole of the third transistor, and the other end is connected with the peak voltage output end.
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| CN111817545B (en) | 2022-03-18 |
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