CN218603360U - Power half-bridge isolation drive circuit with adjustable positive and negative drive voltages - Google Patents
Power half-bridge isolation drive circuit with adjustable positive and negative drive voltages Download PDFInfo
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- CN218603360U CN218603360U CN202222210894.XU CN202222210894U CN218603360U CN 218603360 U CN218603360 U CN 218603360U CN 202222210894 U CN202222210894 U CN 202222210894U CN 218603360 U CN218603360 U CN 218603360U
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Abstract
The application relates to the technical field of electronic power, in particular to a power half-bridge isolation driving circuit with adjustable positive and negative driving voltages and a positive and negative voltage adjusting method. The driving circuit is used for driving a driving circuit of a power half-bridge and comprises an upper tube driving circuit and a lower tube driving circuit, the upper tube driving circuit and the lower tube driving circuit are connected in an interlocking manner, and the circuit structure of the upper tube driving circuit is consistent with that of the lower tube driving circuit; the upper tube drive circuit includes an isolated drive power supply, an isolated driver, and an adjustable converter. The drive circuit comprises an isolation drive power supply, an isolation driver and an adjustable converter, wherein the isolation drive power supply with adjustable positive and negative voltages is used for providing level-adjustable on and off isolation voltages for power devices in a power half bridge, and the isolation driver is used for realizing isolation of input drive signals in a power half bridge circuit and driving the power devices in the power half bridge to be switched on and off.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a power half-bridge isolation driving circuit with adjustable positive and negative driving voltages.
Background
The switch-on voltage and the switch-off voltage in the existing power half-bridge driving circuit are basically fixed, and most half-bridge driving circuits cannot provide negative voltage switch-off. In order to study the influence of different turn-on and turn-off voltages on the switching speed, the switching voltage current stress, the switching loss and the turn-on loss of a power semiconductor device in a power half bridge, analyze the safe driving voltage of the power device and evaluate the suppression effect of turn-off negative voltage on crosstalk conduction, an adjustable positive and negative driving voltage is needed. Because a large voltage difference exists between the upper tube driving level and the lower tube driving level of the power half bridge in actual operation, isolated power supplies need to be provided for two power devices in the power half bridge respectively.
SUMMERY OF THE UTILITY MODEL
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
The present application is directed to overcome the above-mentioned deficiencies, and to provide a power half-bridge isolation driving circuit with adjustable positive and negative driving voltages, which includes an isolation driving power supply, an isolation driver and an adjustable inverter, wherein the isolation driving power supply with adjustable positive and negative voltages is used for providing level-adjustable turn-on and turn-off isolation voltages for power devices in a power half-bridge, and the isolation driver is used for achieving isolation of an input driving signal in the power half-bridge circuit and driving the power devices in the power half-bridge to turn on and turn off.
In order to achieve the purpose, the technical solution of the application is as follows: a power half-bridge isolation drive circuit with adjustable positive and negative drive voltages is used for driving a drive circuit of a power half-bridge and comprises an upper tube drive circuit and a lower tube drive circuit, wherein the upper tube drive circuit is connected with the lower tube drive circuit in an interlocking manner, and the circuit structure of the upper tube drive circuit is consistent with that of the lower tube drive circuit; this top tube drive circuit includes:
the input end of the isolation driving power supply comprises an external power supply voltage, and the output end of the isolation driving power supply comprises a power supply positive electrode and a power supply ground level;
the isolation driver comprises an isolation driver front stage and an isolation driver rear stage, wherein the input end of the isolation driver front stage comprises a driver anode, a driver ground level and a PWM (pulse-width modulation) driving signal, and the output end of the isolation driver rear stage comprises an on driving resistor, an off driving resistor, an isolation driving power supply anode and an isolation driving power supply cathode;
the adjustable converter comprises a positive voltage adjustable converter and a negative voltage adjustable converter, wherein the input end of the positive voltage adjustable converter is connected with the positive electrode of the power supply and the ground level of the power supply, the output end of the positive voltage adjustable converter comprises a positive voltage converter positive electrode and a positive voltage converter ground level, the input end of the negative voltage adjustable converter is connected with the positive electrode of the power supply and the ground level of the power supply, and the output end of the negative voltage adjustable converter comprises a negative voltage converter negative electrode and a negative voltage converter ground level;
the positive pole of the positive voltage converter provides a power supply for the rear stage of the isolation driver, and the negative pole of the negative voltage converter provides a power supply for the rear stage of the isolation driver.
In some embodiments, the positive voltage adjustable converter is a buck converter, and a first adjustable resistor and a first fixed sampling resistor are disposed in the buck converter, where the first fixed sampling resistor is used to divide the voltage output by the positive pole of the positive voltage converter, and the first adjustable resistor is used to adjust the voltage output by the positive pole of the positive voltage converter.
In some embodiments, the negative voltage adjustable converter is a buck-boost converter, a second adjustable resistor and a second fixed sampling resistor are arranged in the buck-boost converter, the second fixed sampling resistor is used for dividing the voltage output by the negative pole of the negative voltage converter, and the second adjustable resistor is used for adjusting the voltage output by the negative pole of the negative voltage converter.
In some embodiments, the positive voltage transducer ground level is shorted together with the negative voltage transducer ground level.
In some embodiments, the upper tube driving circuit, the positive voltage converter ground level and the negative voltage converter ground level are shorted together and connected to a midpoint of the power half bridge.
In some embodiments, the down tube driving circuit, the positive voltage converter ground level and the negative voltage converter ground level are shorted together, and are connected to the ground level of the power half bridge.
In some embodiments, the power half-bridge comprises a top tube and a bottom tube, one end of the top tube is connected with the midpoint of the power half-bridge, the other end of the top tube is connected with an external direct current high voltage positive electrode, one end of the bottom tube is connected with the midpoint of the power half-bridge, and the other end of the bottom tube is connected with an external direct current high voltage ground level.
In some embodiments, the upper tube and the lower tube are connected to an external input drive signal.
The application also provides a method for adjusting positive and negative voltages of a driving power half bridge, which comprises
Setting a reference voltage;
acquiring voltages generated by the positive pole of the positive-voltage converter and the negative pole of the negative-voltage converter through a fixed sampling resistor to obtain a feedback voltage;
comparing the feedback voltage with a reference voltage to obtain a voltage difference value;
and adjusting the size of the adjustable resistor according to the voltage difference value, thereby obtaining the output voltage.
In some embodiments, the output voltage includes outputting a positive voltage, outputting a negative voltage,
the calculation formula of the output positive voltage is
In the formula, R 1_x (x = t or b) is an adjustable resistance, R 1_x_f (x = t or b) is a fixed sampling resistance, V ref1 Is a reference voltage, V on_px (x = t or b) is an output positive voltage, x = t is a top tube driving circuit, and x = b is a bottom tube driving circuit;
the output negative voltage is calculated by the formula
In the formula, R 2_x (x = t or b) is an adjustable resistance, R 2_x_f (x = t or b) is a fixed sampling resistance, V ref2 Is a reference voltage, -V off_nx (x = t or b) is an output negative voltage, x = t is an upper tube driving circuit, and x = b is a lower tube driving circuit.
The working principle of the application is as follows:
through an adjustable resistance R 1_x (x = t or b) and a fixed sampling resistance R 1_x_f (x = t or b) output voltage V to buck converter on_px And (x = t or b) sampling, and feeding the sampled voltage back to the feedback input end FB of the buck converter. Buck buck converter based on feedback voltage and internal reference voltage V ref1 The difference value of (3) controls the output voltage to be stable. Positive output voltage V on_px And an adjustable resistance R 1_x A fixed resistor R 1 The calculation formula (1) is satisfied between the _x _ fix and the buck converter internal reference voltage Vref 1.
By adjusting the adjustable resistor R according to the calculation formula (1) 1_x The resistance value of the voltage regulator can realize the continuous regulation of the output positive voltage within a certain voltage range.
Through an adjustable resistance R 2_x (x = t or b) and a fixed sampling resistance R 2_x_f (x = t or b) output voltage-V to buck-boost converter off_nx And (x = t or b) sampling is carried out, and the sampled voltage is fed back to a feedback input terminal FB of the buck-boost converter.
The buck-boost converter is based on the feedback voltage and the internal reference voltage-V ref2 The difference value of (3) controls the output voltage to be stable. Output negative voltage-V off_nx And an adjustable resistance R 2_x A fixed resistor R 2 X _ fix and buck-boost converter internal reference voltage-V ref2 Satisfies the calculation formula (2).
According to the calculation formula (2), by adjusting the adjustable resistor R 2_x The resistance value of the voltage regulator can realize the continuous regulation of the output negative voltage within a certain voltage range.
Through adopting foretell technical scheme, the beneficial effect of this application is:
the drive circuit comprises an isolation drive power supply, an isolation driver and an adjustable converter, wherein the isolation drive power supply with adjustable positive and negative voltages is used for providing level-adjustable on and off isolation voltages for power devices in a power half bridge, and the isolation driver is used for realizing isolation of input drive signals in a power half bridge circuit and driving the power devices in the power half bridge to be switched on and off.
Reference voltage is set in the voltage regulation device, voltage generated by the positive pole of the positive-pressure converter and the negative pole of the negative-pressure converter is collected through the fixed sampling resistor, feedback voltage is obtained, the feedback voltage is compared with the reference voltage, a voltage difference value is obtained, and the size of the adjustable resistor is regulated according to the size of the voltage difference value, so that the output voltage can be continuously regulated within a certain range.
This application has improved half-bridge drive circuit's interference immunity through shaping circuit, goes up the tube drive circuit and has promoted half-bridge drive circuit's reliability with lower tube drive circuit interlocking connection, has reduced drive power through output adjustable turn-on voltage and turn-off voltage, has strengthened half-bridge drive circuit's compatibility.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Clearly, such objects and other objects of the present application will become more apparent after a detailed description of the preferred embodiments thereof as illustrated in the various figures and drawings.
These and other objects, features and advantages of the present application will become more apparent from the following detailed description of one or more preferred embodiments, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and not to limit the application.
In the drawings, like parts are designated with like reference numerals, and the drawings are schematic and not necessarily drawn to scale.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 one or several embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to such drawings without creative efforts.
FIG. 1 is a schematic diagram of a power half-bridge isolated driving circuit with adjustable positive and negative driving voltages according to the present application;
FIG. 2 is a schematic diagram of a buck converter with output voltage feedback according to the present application;
FIG. 3 is a buck-boost converter with output voltage feedback according to the present application.
Detailed Description
The following detailed description will be provided with reference to the drawings and examples to explain how to apply the technical means to solve the technical problems and to achieve the technical effects. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments in the present application may be combined with each other, and the technical solutions formed are all within the scope of the present application.
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of the specific details or with other methods described herein.
According to some embodiments of the present application, a power half-bridge isolation driving circuit with adjustable positive and negative driving voltages is provided, which is used for driving a driving circuit of a power half-bridge, and comprises an upper tube driving circuit and a lower tube driving circuit, wherein the upper tube driving circuit and the lower tube driving circuit are connected in an interlocking manner, and the circuit structure of the upper tube driving circuit is consistent with that of the lower tube driving circuit; this top tube drive circuit includes:
an isolated drive power supply having an input including an external supply voltage V in The output end of the isolation driving power supply comprises a power supply anode V t And power ground level V t_Gnd ；
An isolation driver comprising an isolation driver pre-stage and an isolation driver post-stage, the input of the isolation driver pre-stage comprising a driver anode V drv Driver ground level GND drv The output end of the rear stage of the isolation driver comprises a turn-on driving resistor R on_t Turn off the driving resistor R on_b ；
The adjustable converter comprises a positive voltage adjustable converter, a negative voltage adjustable converter, an input end of the positive voltage adjustable converter and a positive electrode V of the power supply t And the ground level V of the power supply t_Gnd The output end of the positive voltage adjustable converter comprises a positive voltage converter positive electrode V on_pt Earth level V of positive voltage converter Gnd_t The input end of the negative voltage adjustable converter and the positive electrode V of the power supply t And the ground level V of the power supply t_Gnd The output end of the negative voltage adjustable converter comprises a negative voltage converter cathode-V off_pt Ground level V of negative pressure converter Gnd_t ；
Wherein, the positive pole V of the positive pressure converter on_pt Providing a power supply for the back stage of the isolated driver, the negative pole-V of the negative voltage converter off_pt And providing a power-off for the rear stage of the isolation driver.
According to some embodiments of the present application, optionally, the positive voltage adjustable converter is a buck converter having a first adjustable resistance R disposed therein 1_x (x = t or b), a first fixed sampling resistance R 1_x_f (x = t or b), the first fixed sampling resistance R 1_x_f And (x = t or b) a voltage V for output to the positive electrode of the positive voltage converter on_px (x = t or b) and the first adjustable resistance R 1_x (x = t or b) for regulating the voltage V output from the positive pole of the positive-voltage converter on_px (x = t or b).
According to some embodiments of the application, optionally, the negative voltage adjustable converter is a buck-boost converter having a second adjustable resistor R disposed therein 2_x (x = t or b), a second fixed sampling resistance R 2_x_f (x = t or b), the second fixed sampling resistance R 2_x_f (x = t or b) voltage-V for output to the negative electrode of the negative voltage converter off_nx (x = t or b) and the second adjustable resistor R 2_x (x = t or b) for adjusting the voltage-V output from the negative pole of the negative-voltage converter off_nx (x = t or b).
According to some embodiments of the application, optionally, the positive voltage converter ground level V t_Gnd Is connected with the ground level V of the negative pressure converter Gnd_t Are shorted together.
According to some embodiments of the application, optionally the top tube drive circuit, the positive voltage converter ground level V Gnd_t And the ground level V of the negative pressure converter Gnd_t Shorted together and connected to the midpoint O of the power half bridge.
According to some embodiments of the application, optionally, the down tube driving circuit, the cathodeVoltage transformer ground level V Gnd_b And the ground level V of the negative pressure converter Gnd_b Are shorted together and are connected to the ground level GND of the power half bridge.
According to some embodiments of the application, optionally, the power half bridge comprises a top tube Q 1 Lower tube Q 2 The upper pipe Q 1 Is connected to the midpoint O of the power half-bridge, the upper tube Q 1 The other end of the positive electrode is connected with an external direct current high-voltage positive electrode V DC The lower tube Q 2 Is connected to the midpoint of the power half-bridge, the lower tube Q 2 The other end of the switch is connected with an external direct current high voltage ground level GND.
According to some embodiments of the application, optionally, the upper tube Q 1 And the lower tube Q 2 Are all connected with an external input driving signal PWM H 。
According to some embodiments of the present application, there is provided a method of regulating positive and negative voltages driving a power half-bridge, comprising
Setting a reference voltage V ref1 ；
By fixing the sampling resistance R 1_x_f (x = t or b) collecting voltages generated by the positive pole of the positive-voltage converter and the negative pole of the negative-voltage converter to obtain a feedback voltage V on_px (x = t or b);
will feedback the voltage V on_px (x = t or b) and a reference voltage V ref1 Comparing to obtain a voltage difference value;
according to the magnitude of the voltage difference value, the adjustable resistor R is adjusted 1_x The magnitude of (x = t or b) to obtain an output voltage V on_px 。
According to some embodiments of the application, optionally, the outputting the voltage comprises outputting a positive voltage V on_px Output negative voltage-V off_nx ，
The calculation formula of the output positive voltage is
In the formula, R 1_x (x = t or b) is an adjustable resistance, R 1_x_f (x = t or b) is a fixed sampling resistance, V ref1 Is a reference voltage, V on_px (x = t or b) is an output positive voltage, x = t is a top tube driving circuit, and x = b is a bottom tube driving circuit;
the output negative voltage is calculated by the formula
In the formula, R 2_x (x = t or b) is an adjustable resistance, R 2_x_f (x = t or b) is a fixed sampling resistance, V ref2 Is a reference voltage, -V off_nx (x = t or b) is an output negative voltage, x = t is an upper tube driving circuit, and x = b is a lower tube driving circuit.
The working principle of the application is as follows:
by means of an adjustable resistor R 1_x (x = t or b) and a fixed sampling resistance R 1_x_f (x = t or b) output voltage V to buck converter on_px And (x = t or b) sampling, and feeding the sampled voltage back to the feedback input end FB of the buck converter. buck converter based on feedback voltage and internal reference voltage V ref1 The difference value of (3) controls the output voltage to be stable. Positive output voltage V on_px And an adjustable resistance R 1_x A fixed resistor R 1 The calculation formula (1) is satisfied between the _x _ fix and the buck converter internal reference voltage Vref 1.
According to the calculation formula (1), by adjusting the adjustable resistor R 1_x The resistance value of the voltage regulator can realize the continuous regulation of the output positive voltage within a certain voltage range.
By means of an adjustable resistor R 2_x (x = t or b) and a fixed sampling resistance R 2_x_f (x = t or b) output voltage-V to buck-boost converter off_nx And (x = t or b) sampling is carried out, and the sampled voltage is fed back to a feedback input terminal FB of the buck-boost converter. buck-boost converter based on inverseFeed voltage and internal reference voltage-V ref2 The difference value of (3) controls the output voltage to be stable. Output negative voltage-V off_nx And an adjustable resistance R 2_x A fixed resistor R 2 X _ fix and buck-boost converter internal reference voltage-V ref2 Satisfies the calculation formula (2).
According to the calculation formula (2), by adjusting the adjustable resistor R 2_x The resistance value of the voltage regulator can realize the continuous regulation of the output negative voltage within a certain voltage range.
Referring to fig. 1-3, fig. 1 is a power half-bridge isolated driving circuit with adjustable positive and negative driving voltages according to the present application; FIG. 2 is a schematic diagram of a buck converter with output voltage feedback according to the present application; FIG. 3 is a buck-boost converter with output voltage feedback according to the present application.
According to some embodiments of the present application, a power half-bridge isolation driving circuit with adjustable positive and negative driving voltages is provided, which is used for driving a driving circuit of a power half-bridge, and comprises an upper tube driving circuit and a lower tube driving circuit.
In FIG. 1, V in Is the external supply voltage, V, of the positive and negative adjustable isolation driving power supply drv And GND drv Respectively the positive pole and ground level of the external input voltage supplying the front stage of the isolation driver 1 and the isolation driver 2. The power half-bridge is composed of an upper power switch tube Q 1 And a power switch tube Q positioned below 2 Is formed of, wherein V DC And GND are respectively positive and ground levels of external DC high voltage connected with power half bridge, PWM H And PWM L Respectively a control power half-bridge upper tube Q 1 And a lower tube Q 2 Of an externally input drive signal, R on_t And R off_t Respectively being an upper tube Q 1 On and off driving resistance of R on_b And R off_b Are respectively a lower tube Q 2 Turn the drive resistor on and off.
In fig. 1, circuits in upper and lower dotted frames constitute an upper tube driving circuit and a lower tube driving circuit, respectively.
For top-tube drive circuits, the external supply voltage V in For supplying power to an isolated DC-DC power supply 1, the output is V t Is a positive electrode with V t_Gnd The upper tube for ground level isolates the drive power supply. The output voltage of the isolation DC-DC power supply 1 is connected with the positive voltage adjustable converter 1 in the figure 1, and the positive voltage V for supplying power for the rear stage of the isolation driver 1 is output on_pt The output voltage of the isolation DC-DC power supply 1 is connected with the negative voltage adjustable converter 1, and the negative voltage-V for providing power-off for the subsequent stage of the isolation driver 1 is output off_pt . Ground level V of positive voltage adjustable converter 1 and negative voltage adjustable converter 1 Gnd_t Shorted together and connected to the midpoint O of the power half bridge in fig. 1.
For the down tube drive circuit, the external supply voltage V in For isolating DC-DC power supply 2, output is provided by V b Is a positive electrode with V b_Gnd The lower tube, which is ground level, isolates the drive power supply. The output voltage of the isolation DC-DC power supply 2 is connected with the positive voltage adjustable converter 2 in the figure 1, and the positive voltage V for supplying power for the rear stage of the isolation driver 2 is output on_pb The output voltage of the isolation DC-DC power supply 2 is connected with a negative voltage adjustable converter 2, and the negative voltage-V for providing power-off for the subsequent stage of the isolation driver 2 is output off_pb . Ground level V of positive voltage adjustable converter 2 and negative voltage adjustable converter 2 Gnd_b Are shorted together and connected to the ground level GND of the power half bridge in fig. 1.
In fig. 2, an input voltage ground level pin V x_Gnd (x = t or b) and an output ground level V Gnd_x (x = t or b) the pins are shorted together. Through an adjustable resistance R 1_x (x = t or b) and a fixed sampling resistance R 1_x_f (x = t or b) output voltage V to buck converter on_px And (x = t or b) sampling, and feeding the sampled voltage back to the feedback input end FB of the buck converter. buck converter based on feedback voltage and internal reference voltage V ref1 The difference value of (3) controls the output voltage to be stable. Positive output voltage V on_px And an adjustable resistance R 1_x A fixed resistor R 1 -x-fix and buckThe following calculation formula is satisfied between the converter internal reference voltage Vref 1.
According to the above calculation formula, by adjusting the adjustable resistor R 1_x The resistance value of the voltage regulator can realize the continuous regulation of the output positive voltage within a certain voltage range.
In fig. 3, an input voltage ground level pin V x_Gnd (x = t or b) and an output ground level V Gnd_x (x = t or b) the pins are shorted together. By means of an adjustable resistor R 2_x (x = t or b) and a fixed sampling resistance R 2_x_f (x = t or b) output voltage-V to buck-boost converter off_nx (x = t or b) is sampled and the sampled voltage is fed back into the feedback input FB of the buck-boost converter.
buck-boost converter based on feedback voltage and internal reference voltage-V ref2 The difference value of (3) controls the output voltage to be stable. Output negative voltage-V off_nx And an adjustable resistance R 2_x A fixed resistor R 2 -x-fix and buck-boost converter internal reference voltage-V ref2 Satisfies the following calculation formula.
By adjusting the adjustable resistor R according to the above calculation formula 2_x The resistance value of the voltage regulator can realize the continuous regulation of the output negative voltage within a certain voltage range.
It is to be understood that the embodiments disclosed herein are not limited to the particular process steps or materials disclosed herein, but rather, are extended to equivalents thereof as would be understood by those of ordinary skill in the relevant art. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "an embodiment" means that a particular feature, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
It should be noted that in the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and thus the scope of the present application is not limited by the specific embodiments disclosed above.
Claims (8)
1. A power half-bridge isolation driving circuit with adjustable positive and negative driving voltages is used for driving a driving circuit of a power half-bridge and is characterized by comprising an upper tube driving circuit and a lower tube driving circuit, wherein the upper tube driving circuit is connected with the lower tube driving circuit in an interlocking manner, and the circuit structure of the upper tube driving circuit is consistent with that of the lower tube driving circuit; this top tube drive circuit includes:
the input end of the isolation driving power supply comprises external power supply voltage, and the output end of the isolation driving power supply comprises a power supply anode, a power supply cathode and a power supply ground level;
the isolation driver comprises an isolation driver front stage and an isolation driver rear stage, wherein the input end of the isolation driver front stage comprises a driver anode, a driver ground level and a PWM input signal, and the output end of the isolation driver rear stage comprises an on driving resistor, an off driving resistor, an isolation driving power supply anode and an isolation driving power supply cathode;
the adjustable converter comprises a positive voltage adjustable converter and a negative voltage adjustable converter, wherein the input end of the positive voltage adjustable converter is connected with the positive electrode of the power supply and the ground level of the power supply, the output end of the positive voltage adjustable converter comprises a positive voltage converter positive electrode and a positive voltage converter ground level, the input end of the negative voltage adjustable converter is connected with the positive electrode of the power supply and the ground level of the power supply, and the output end of the negative voltage adjustable converter comprises a negative voltage converter negative electrode and a negative voltage converter ground level;
the positive pole of the positive-voltage converter provides a power supply for the rear stage of the isolation driver, and the negative pole of the negative-voltage converter provides a power supply for the rear stage of the isolation driver.
2. The positive-negative drive voltage adjustable power half-bridge isolated driving circuit as claimed in claim 1, wherein the positive voltage adjustable converter is a buck converter, a first adjustable resistor and a first fixed sampling resistor are disposed in the buck converter, the first fixed sampling resistor is used for dividing the voltage outputted by the positive pole of the positive voltage converter, and the first adjustable resistor is used for adjusting the voltage outputted by the positive pole of the positive voltage converter.
3. The half-bridge isolated driving circuit as claimed in claim 1, wherein the negative voltage adjustable inverter is a buck-boost inverter, and a second adjustable resistor and a second fixed sampling resistor are disposed in the buck-boost inverter, the second fixed sampling resistor is used for dividing the voltage outputted from the negative pole of the negative voltage inverter, and the second adjustable resistor is used for adjusting the voltage outputted from the negative pole of the negative voltage inverter.
4. The positive-negative drive voltage adjustable power half-bridge isolated drive circuit of claim 1, wherein the positive voltage converter ground level is shorted with the negative voltage converter ground level.
5. The isolated driver circuit of claim 1, wherein the top-tube driver circuit, the positive inverter ground level and the negative inverter ground level are shorted together and connected to the midpoint of the power half-bridge.
6. The isolated driver circuit of claim 1, wherein the down tube driver circuit is connected to the ground level of the power half bridge and the ground level of the positive voltage converter is shorted to the ground level of the negative voltage converter.
7. The isolated driving circuit of claim 1, wherein the power half bridge comprises a top tube and a bottom tube, one end of the top tube is connected to the midpoint of the power half bridge, the other end of the top tube is connected to an external DC high voltage positive electrode, one end of the bottom tube is connected to the midpoint of the power half bridge, and the other end of the bottom tube is connected to an external DC high voltage ground level.
8. The half-bridge isolated driver circuit of claim 7, wherein the upper tube and the lower tube are connected to an external input driving signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222210894.XU CN218603360U (en) | 2022-08-22 | 2022-08-22 | Power half-bridge isolation drive circuit with adjustable positive and negative drive voltages |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222210894.XU CN218603360U (en) | 2022-08-22 | 2022-08-22 | Power half-bridge isolation drive circuit with adjustable positive and negative drive voltages |
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| CN218603360U true CN218603360U (en) | 2023-03-10 |
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| CN202222210894.XU Active CN218603360U (en) | 2022-08-22 | 2022-08-22 | Power half-bridge isolation drive circuit with adjustable positive and negative drive voltages |
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- 2022-08-22 CN CN202222210894.XU patent/CN218603360U/en active Active
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