CN115102376B - Low-voltage input high-low voltage driving circuit - Google Patents
Low-voltage input high-low voltage driving circuit Download PDFInfo
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- CN115102376B CN115102376B CN202210823207.3A CN202210823207A CN115102376B CN 115102376 B CN115102376 B CN 115102376B CN 202210823207 A CN202210823207 A CN 202210823207A CN 115102376 B CN115102376 B CN 115102376B
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
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Abstract
The invention discloses a low-voltage input high-low voltage driving circuit, which comprises: one end of the second switch tube is connected with the first power supply, the other end of the second switch tube is connected with one end of the first switch tube, the other end of the first switch tube is grounded, and the joint of the second switch tube and the first switch tube is used as the output end of the high-low voltage driving circuit; the first end of the inductor is connected with a second power supply through a first switch, the second end of the inductor is grounded through a third switch, the first end of the inductor is grounded through a second switch, the resistor is connected with the third switch in parallel, and the second end of the inductor is connected with the controlled ends of the first switch tube and the second switch tube. The invention realizes high-low voltage driving of low-voltage input by the control voltage generating circuit with simple structure, thereby ensuring that the driving circuit has small volume and high reliability.
Description
Technical Field
The invention relates to the technical field of pulses, in particular to a low-voltage input high-voltage and low-voltage driving circuit.
Background
Fig. 1 shows a conventional driving circuit structure in the related art, wherein vdd' is a power voltage, vdr is a control voltage, i.e., a voltage of a control signal, M1 and M2 are a first switch tube and a second switch tube, and vout is an output voltage of the driving circuit.
The working principle of the common driving circuit is as follows: when the control voltage vdr is high, the first switch tube M1 is turned on, the second switch tube M2 is turned off, the output current iout flows from the output voltage end to ground (gnd), and a current is drawn from a driven device (which may be a driven switch tube, not shown in the figure), as shown in fig. 2; when the control voltage vdr is low, the first switch tube M1 is turned off, the second switch tube M2 is turned on, and the output current iout flows from the power supply voltage end to the output voltage end to supply current to the driven device, as shown in fig. 3.
However, as can be seen from fig. 2, if the control voltage vdr is not high enough, two problems are caused: (1) The first switch tube M1 cannot be completely opened, which causes the equivalent resistance of the first switch tube M1 to be too large, thereby reducing the value of the output current iout and affecting the driving effect; (2) The second switch M2 cannot be completely turned off, which causes a current flowing to the output voltage terminal through the second switch M2, and also causes the output current iout to decrease. As can be seen from fig. 3, if the control voltage vdr is not low enough, two problems are caused: (1) The second switching tube M2 cannot be completely opened, which causes the equivalent resistance of the second switching tube M2 to be too large, thereby reducing the value of the output current iout and affecting the driving effect; (2) The first switch tube M1 cannot be completely turned off, which causes a part of the current on the second switch tube M2 to flow to the first switch tube M1, and also causes the output current iout to decrease.
Therefore, in order to ensure the driving reliability, the control voltage vdr needs to be as high as possible when it is at a high level and as low as possible when it is at a low level.
In general, the circuit generating the control voltage vdr outputs the highest voltage of the power supply and outputs the lowest voltage gnd, that is, 0V, and in this case, if the control voltage vdr larger than the voltage of the power supply is desired, a charge pump circuit is generally used, but the circuit configuration of the charge pump circuit is complicated, and the reliability of the drive circuit is reduced and the size is increased.
Disclosure of Invention
In view of this, embodiments of the present invention provide a low-voltage input high-low voltage driving circuit to solve the problem in the prior art that the reliability of the driving circuit is reduced and the size of the driving circuit is increased due to the need of using a charge pump circuit to increase the control voltage of the driving circuit.
The embodiment of the invention provides a low-voltage input high-low voltage driving circuit, which comprises:
the circuit comprises a first switching tube M1, a second switching tube M2, an inductor L1, a resistor rc, a first switch s1, a second switch s2, a third switch s3, a first power supply and a second power supply;
one end of the second switch tube M2 is connected to the first power supply, the other end of the second switch tube M2 is connected to one end of the first switch tube M1, the other end of the first switch tube M1 is grounded, and a joint of the second switch tube M2 and the first switch tube M1 serves as an output end of the high-low voltage driving circuit;
the first end of inductance L1 passes through first switch s1 with the second power is connected, the second end of inductance L1 passes through third switch s3 ground connection, the first end of inductance L1 still passes through second switch s2 ground connection, resistance rc with third switch s3 is parallelly connected, the second end of inductance L1 still with first switch tube M1 and the controlled end of second switch tube M2 is connected.
Optionally, when the first switch s1 is closed, the second switch s2 is opened, and the third switch s3 is closed, the high-low voltage driving circuit is in a first working mode; when the first switch s1 is turned off, the second switch s2 is turned on, and the third switch s3 is turned off, the high-low voltage driving circuit is in a second working mode; and when the high-voltage and low-voltage driving circuit works, the high-voltage and low-voltage driving circuit is alternately in the first working mode and the second working mode.
Optionally, the first switch s1, the second switch s2, and the third switch s3 are controllable switches.
Optionally, the low-voltage input high-low voltage driving circuit further includes a control module, and the control module is respectively connected to the first switch s1, the second switch s2, and the third switch s3, and is configured to respectively control on/off of the first switch s1, the second switch s2, and the third switch s3, so that the high-low voltage driving circuit alternately operates in a first operating mode and a second operating mode when operating.
Optionally, the control module is configured to periodically control on/off of the first switch s1, the second switch s2, and the third switch s3 according to a preset time.
Optionally, the control module is configured to determine on-off durations of the first switch s1, the second switch s2, and the third switch s3 according to the inductance value of the inductor L1, the resistance value of the resistor rc, the output voltage of the first power supply, the output voltage of the second power supply, duty ratios of the first switch tube and the second switch tube, and the charging target current of the inductor L1, and correspondingly control on-off of the first switch s1, the second switch s2, and the third switch s3 according to the determined on-off durations of the first switch s1, the second switch s2, and the third switch s 3.
Optionally, the control module is configured to determine, according to the inductance of the inductor L1, the resistance of the resistor rc, the output voltage of the first power supply, duty ratios of the first switch tube and the second switch tube, and a charging target current of the inductor L1, a duration of the high-voltage and low-voltage driving circuit in the second working mode; determining the duration of the high-low voltage driving circuit in the first working mode according to the inductance of the inductor L1, the output voltage of the second power supply, the charging target current of the inductor L1, and the current of the inductor L1 when the high-low voltage driving circuit is switched from the second working mode to the first working mode; and determining the on-off duration of the first switch s1, the second switch s2 and the third switch s3 according to the duration of the high-low voltage driving circuit in the second working mode and the duration of the high-low voltage driving circuit in the first working mode.
Optionally, the second switching tube M2 is a P-channel field effect transistor, and the first switching tube M1 is an N-channel field effect transistor.
Optionally, the second switching tube M2 is a PNP type triode, and the first switching tube M1 is an NPN type triode.
Optionally, the high-low voltage driving circuit is used for driving the controllable switching tube.
In the embodiment of the invention, after the low input voltage (the output voltage vcc of the second power supply) is input into the control voltage generating circuit in the driving circuit, the high-voltage control signal and the low-voltage control signal are obtained, and after the high-voltage control signal or the low-voltage control signal is input into the circuit formed by the subsequent switching tubes, the high-voltage and low-voltage driving is realized, namely, the high-voltage and low-voltage driving is realized through the low-voltage input, so that the power consumption of the driving circuit is reduced. Moreover, the whole circuit structure of the high-low voltage driving circuit is simple, so that the volume of the driving circuit is small; the first switch tube M1 and the second switch tube M2 in the high-low voltage driving circuit can be completely opened or completely closed during working, so that the equivalent resistance of the switch tubes is reduced, the working efficiency of the driving circuit is improved, and the reliability of the driving circuit is ensured. In addition, in the second working mode, only the inductor L1 and the resistor rc participate in the working, so that the power consumption of the control voltage generation circuit is low, and the power consumption of the driving circuit is further reduced.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
FIG. 1 is a diagram illustrating a conventional driving circuit structure in the related art;
FIG. 2 is a schematic diagram of the driving circuit shown in FIG. 1 drawing current from a driven device;
FIG. 3 is a schematic diagram of the driving circuit shown in FIG. 1 delivering current to a driven device;
fig. 4 is a schematic structural diagram of a low-voltage input high-low voltage driving circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a control voltage generating circuit in the low-voltage input high-low voltage driving circuit shown in FIG. 4;
fig. 6 is an equivalent circuit diagram of a control voltage generating circuit in a low-voltage input high-low voltage driving circuit provided in an embodiment of the invention in a first operating mode;
fig. 7 is an equivalent circuit diagram of a control voltage generating circuit in a low-voltage input high-low voltage driving circuit provided in an embodiment of the invention in a second operating mode;
fig. 8 is a schematic diagram illustrating a change of the control voltage output by the control voltage generation circuit with time after the circuit enters the second working mode after the inductor is charged;
fig. 9 is a schematic diagram illustrating a change of the control voltage output by the control voltage generation circuit with time in a working mode switching cycle (including a time in the second working mode and a time in the first working mode) after the inductor is charged;
fig. 10 is a schematic diagram illustrating a change of a current on an inductor with time in a switching cycle of a working mode (including a time in a second working mode and a time in a first working mode) after the inductor is charged;
fig. 11 is a schematic diagram of a periodic waveform of a control voltage during a plurality of working mode switching periods according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus comprising the element. Furthermore, the terms "first", "second", etc. are used 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. In the description of the following examples, "plurality" means two or more unless specifically limited otherwise.
Referring to fig. 4, an embodiment of the invention provides a low-voltage input high-low voltage driving circuit, including:
a first switch tube M1, a second switch tube M2, an inductor L1, a resistor rc, a first switch s1, a second switch s2, a third switch s3, a first power supply (with output voltage of vdd) and a second power supply (with output voltage of vcc);
one end of the second switch tube M2 is connected to the first power supply, the other end of the second switch tube M2 is connected to one end of the first switch tube M1, the other end of the first switch tube M1 is grounded, and a connection between the second switch tube M2 and the first switch tube M1 serves as an output end of the high-low voltage driving circuit;
the first end of the inductor L1 is connected to the second power supply through the first switch s1, the second end of the inductor L1 is grounded through the third switch s3, the first end of the inductor L1 is also grounded through the second switch s2, the resistor rc is connected in parallel with the third switch s3, and the second end of the inductor L1 is also connected to the controlled ends of the first switch tube M1 and the second switch tube M2;
that is, the one end of first switch s1 is connected with the second power, the other end of first switch s1 in proper order with inductance L1, ground connection behind the third switch s3 series connection, first switch s1 with inductance L1's junction with the one end of second switch s2 is connected, the other end ground connection of second switch s2, inductance L1 with the junction of third switch s3 with the one end of resistance rc is connected, the other end ground connection of resistance rc, inductance L1 with the junction of third switch s3 still with the controlled end of first switch pipe M1 and the controlled end of second switch pipe M2 is connected.
In the embodiment of the present invention, when the first switch s1 is closed, the second switch s2 is opened, and the third switch s3 is closed, the high-low voltage driving circuit is in a first working mode; when the first switch s1 is turned off, the second switch s2 is turned on, and the third switch s3 is turned off, the high-low voltage driving circuit is in a second working mode; and when the high-voltage and low-voltage driving circuit works, the high-voltage and low-voltage driving circuit is alternately in the first working mode and the second working mode.
Specifically, the inductor L1 is a power inductor, and the resistor rc is a discharge resistor. Referring to fig. 5, a control voltage generating circuit is formed by the second power supply, the inductor L1, the resistor rc, the first switch s1, the second switch s2, and the third switch s3, the second end of the inductor L1 is an output end of the control voltage generating circuit, and is configured to output a control voltage vdr, where the control voltage vdr is configured to control on/off of the first switch tube M1 and the second switch tube M2. The second power supply may be a low voltage power supply, in other words the voltage vcc of the second power supply input to the control voltage generating circuit is a low voltage, i.e. the control voltage generating circuit is a low voltage input control voltage generating circuit.
In the embodiment of the present invention, when the high-voltage and low-voltage driving circuit is in the first working mode, referring to fig. 6, the control voltage vdr output by the control voltage generating circuit is the first control voltage (the first control voltage is 0V), that is, the second end of the inductor L1 outputs the first control voltage. When the high-voltage and low-voltage driving circuit is in the second working mode, referring to fig. 7, the control voltage vdr output by the control voltage generating circuit is the second control voltage (at this time, the terminal voltage of the resistor rc is the second control voltage), that is, the second end of the inductor L1 outputs the second control voltage. The first control voltage is lower than the second control voltage. The high-voltage and low-voltage driving circuit is alternately in the first working mode and the second working mode during working, so that the control voltage generating circuit alternately outputs the first control voltage and the second control voltage.
The second control voltage is greater than the voltage vdd of the first power supply. The second control voltage can drive the first switch tube M1 to be fully opened and can drive the second switch tube M2 to be fully closed, and the first control voltage can drive the first switch tube M1 to be fully closed and can drive the second switch tube M2 to be fully opened.
The operation of the control voltage generating circuit shown in fig. 5 is described in detail below with reference to two operation modes:
in the initial state, the inductor current is 0, at this time, the first switch s1 and the third switch s3 are closed, the second switch s2 is opened, the high-low voltage driving circuit enters the first working mode, the current on the inductor L1 slowly rises, and the inductor current
Suppose that at time t0, the value of the inductor current reaches i 0 ，
At this time, after the inductor is charged, the first switch s1 and the third switch s3 are opened, the second switch s2 is closed, the high-low voltage driving circuit enters the second working mode, the current of the inductor L1 begins to decrease, and the current on the inductor L1 cannot suddenly change, so that when the circuit just enters the second working mode, the current on the inductor L1 still remains i 0 Therefore, in the second operation mode, the current of the inductor L1 changes with time according to the formula
Therefore, at this time, the formula of the change of the control voltage vdr with time is
Accordingly, a voltage waveform diagram of the control voltage vdr can be obtained as shown in fig. 8. In the embodiment of the invention, in the second working mode, only the inductor L1 and the resistor rc participate in the working, so that the power consumption of the control voltage generating circuit is lower at the moment.
As can be seen from fig. 8, the control voltage vdr of the control voltage generating circuit is i at the moment when the circuit switches from the first operating mode to the second operating mode 0 * rc, the output voltage of the first power supply is vdd if i 0 *rc>vdd, the control voltage vdr may be greater than the output voltage vdd of the first power supply for a period of time, and assuming that the period of time is ta-t0, it can be obtained as follows:
at this time, although the maximum time that the control voltage vdr can be kept above the output voltage vdd of the first power supply is ta-t0, in general, some margin is left in implementation, and therefore, the operating time tb-t0 of the second operating mode may be designed to be smaller than ta-t0, that is, at the time tb, when the control voltage vdr drops to the switching voltage vd (the switching voltage vd is larger than the output voltage vdd of the first power supply), the high-low voltage driving circuit is switched from the second operating mode back to the first operating mode.
Therefore, at time tb, i.e. the moment of switching back to the first operating mode, the magnitude of the inductor current is
Meanwhile, in the first working mode, the inductor L1 is in a charging state, the inductor current gradually rises, and the inductor current is
At this time, the ending time of the first working mode is designed as tc time, and it is ensured that electricity is generated at tc timeInductive current i c =i 0 I.e. by
And the control voltage vdr is 0V during the period tc-tb.
At this time, the control voltage vdr and the current i on the inductor L1 in the time period t0-tc can be obtained L1 The waveforms of the changes with time are shown in fig. 9 and 10.
Then, at time tc, the circuit switches from the first operating mode to the second operating mode again, and at this time, the current of the inductor L1 is also i 0 Therefore, the control voltage vdr changes according to the rule shown in fig. 9, and circulates back and forth, and finally, a periodic waveform of the control voltage vdr is obtained, as shown in fig. 11.
As can be seen from fig. 11, in one period (tc-t 0 period), the control voltage vdr obtained by the control voltage generating circuit is at a high level higher than the output voltage vdd of the first power supply for tb-t0 period, and at a low level of 0V absolute for tc-tb period. At this time, the duration of the time period tb-t0 and the time period tc-tb can be adjusted by adjusting the inductance of the inductor L1 and the resistance of the resistor rc, so as to control the duty ratio of the driving circuit.
At this time, referring back to fig. 4, the driving circuit can completely turn on or completely turn off the first switching tube M1 and the second switching tube M2, thereby reducing the equivalent resistance of the switching tubes, improving the working efficiency of the driving circuit, and ensuring the reliability of the driving circuit. Meanwhile, the output voltage vcc of the second power supply of the driving circuit, namely the input voltage of the driving circuit, can be very low, and a control voltage generating circuit is utilized to obtain a proper high-voltage control signal and a proper low-voltage control signal, so that the driving circuit realizes high-voltage and low-voltage driving through low-voltage input, and the power consumption of the driving circuit is reduced.
In summary, in the embodiment of the present invention, after a low input voltage (the output voltage vcc of the second power supply) is input to the control voltage generating circuit in the driving circuit, a high voltage control signal and a low voltage control signal are obtained, and the high voltage control signal or the low voltage control signal is input to the circuit formed by the subsequent switching tubes, so that high-voltage and low-voltage driving is realized, that is, high-voltage and low-voltage driving is realized through low-voltage input, and power consumption of the driving circuit is reduced. Moreover, the whole circuit structure of the high-low voltage driving circuit is simple, so that the volume of the driving circuit is small; the first switch tube M1 and the second switch tube M2 in the high-low voltage driving circuit can be completely opened or completely closed during working, so that the equivalent resistance of the switch tubes is reduced, the working efficiency of the driving circuit is improved, and the reliability of the driving circuit is ensured. In addition, in the second working mode, only the inductor L1 and the resistor rc participate in the working, so that the power consumption of the control voltage generation circuit is low, and the power consumption of the driving circuit is further reduced.
In some specific embodiments, the first switch s1, the second switch s2, and the third switch s3 are controllable switches. Such as a field effect transistor (MOS transistor), a triode, a magnetron switch, or a thyristor, etc.
In some specific embodiments, the circuit further includes a control module (not shown in the figure), where the control module is connected to the first switch s1, the second switch s2, and the third switch s3, and is configured to control on/off of the first switch s1, the second switch s2, and the third switch s3, respectively, so that the high-low voltage driving circuit is alternately in the first operating mode and the second operating mode when operating.
In some specific embodiments, the control module is configured to control the charging target current of the inductor L1, i.e. i is described above, according to an inductance of the inductor L1, a resistance of the resistor rc, an output voltage vdd of the first power source, an output voltage vcc of the second power source, duty ratios of the first switching tube and the second switching tube, and a charging target current of the inductor L1 0 Determining the on-off duration of the first switch s1, the second switch s2 and the third switch s3, and correspondingly controlling the on-off of the first switch s1, the second switch s2 and the third switch s3 according to the determined on-off duration of the first switch s1, the second switch s2 and the third switch s 3.
In some specific embodiments, the control module is configured to control the first switch according to an inductance of the inductor L1, a resistance of the resistor rc, an output voltage vdd of the first power source, and the first switchThe duty ratio of the switch-off tube and the second switch tube and the charging target current of the inductor L1, i.e. i 0 Determining the duration of the high-low voltage driving circuit in the second working mode; according to the inductance of the inductor L1, the output voltage vdd of the second power supply, the charging target current of the inductor L1, and the current in the inductor L1 when the high-low voltage driving circuit switches from the second operating mode to the first operating mode (i.e. i is described above b ) Determining the duration of the high-low voltage driving circuit in the first working mode; and determining the on-off duration of the first switch s1, the second switch s2 and the third switch s3 according to the duration of the high-low voltage driving circuit in the second working mode and the duration of the high-low voltage driving circuit in the first working mode.
Specifically, referring to the above description of the operation process of the control voltage generating circuit, the value of the inductor current reaches i after the inductor L1 is charged from the initial state to the first time 0 ，
At the moment, the first switch s1 and the third switch s3 are switched off, the second switch s2 is simultaneously switched on, the high-low voltage driving circuit enters a second working mode, and the formula of the current of the inductor L1 changing along with time is
Therefore, at this time, the formula of the change of the control voltage vdr with time is
. As can be seen from fig. 8, the control voltage vdr of the control voltage generating circuit is i at the moment when the circuit switches from the first operating mode to the second operating mode 0 * rc, the output voltage of the first power supply is vdd if i 0 *rc>vdd, the control voltage vdr may be greater than the output voltage vdd of the first power supply for a period of time, and assuming that the period of time is ta-t0, it can be obtained as follows:
at this time, although the maximum time that the control voltage vdr can be kept above the output voltage vdd of the first power supply is ta-t0, in general, some margin is left in implementation, and therefore, the operating time tb-t0 of the second operating mode may be designed to be smaller than ta-t0, that is, at the time tb, when the control voltage vdr drops to the switching voltage vd (the switching voltage vd is larger than the output voltage vdd of the first power supply), the high-low voltage driving circuit is switched from the second operating mode back to the first operating mode. Therefore, it can be seen that the duration of the second working mode is related to the inductance of the inductor L1, the resistance of the resistor rc, the output voltage of the first power source, and the charging target current of the inductor L1 (i.e. the current i when the inductor L1 is charged before entering the second working mode 0 ) And (4) correlating.
In addition, the selection of tb may also consider duty ratios of the first switching tube and the second switching tube, that is, the control module is configured to determine the duration of the second operating mode of the high-low voltage driving circuit according to the inductance of the inductor L1, the resistance of the resistor rc, the output voltage of the first power source, the charging target current of the inductor L1, and the duty ratios of the first switching tube and the second switching tube.
With continued reference to the above description of the operation of the control voltage generating circuit, at time tb, i.e. the moment of switching back to the first operation mode, the magnitude of the inductor current is equal to
Meanwhile, in the first working mode, the inductor L1 is in a charging state, the inductor current slowly rises, and the inductor current is
At this time, the ending time of the first working mode is designed to be tc time, and it is ensured that the inductive current i is at tc time c =i 0 I.e. by
. It can be seen from this thatThe duration of the high-voltage and low-voltage driving circuit in the first working mode is related to the inductance of the inductor L1, the output voltage of the second power supply, the charging target current of the inductor L1 (that is, the target value that the current on the inductor L1 needs to reach when the first working mode ends), and the current in the inductor L1 when the high-voltage and low-voltage driving circuit is switched from the second working mode to the first working mode. Regarding the current in the inductor L1 when the high-low voltage driving circuit is switched from the second working mode to the first working mode, and i 0 The inductance of the inductor L1, the resistance of the resistor rc and the duration of the second mode of operation, and i 0 Is related to the output voltage vcc of the second power supply.
In other specific embodiments, the control module is configured to periodically control on/off of the first switch s1, the second switch s2, and the third switch s3 according to a preset time. The preset time can also be determined according to the manner that the control module determines the on-off duration of the first switch s1, the second switch s2 and the third switch s 3.
In some specific embodiments, the second switching transistor M2 is a P-channel fet, and the first switching transistor M1 is an N-channel fet. Specifically, a source electrode of the P-channel field effect transistor is connected with the first power supply, a drain electrode of the P-channel field effect transistor is connected with a drain electrode of the N-channel field effect transistor, a source electrode of the N-channel field effect transistor is grounded, and grid electrodes of the P-channel field effect transistor and the N-channel field effect transistor are used as controlled ends and connected with the second end of the inductor L1.
In other specific embodiments, the second switching tube M2 is a PNP transistor, and the first switching tube M1 is an NPN transistor. Specifically, an emitting electrode of the PNP triode is connected to the first power supply, a collecting electrode of the PNP triode is connected to a collecting electrode of the NPN triode, the emitting electrode of the NPN triode is grounded, and base electrodes of the PNP triode and the NPN triode are connected to the second end of the inductor L1 as controlled ends.
Any of the high-voltage and low-voltage driving circuits provided by the above embodiments of the present invention can be used as a driving circuit of a controllable switching tube. The controllable switch tube may be a field effect transistor (MOS tube), a triode, a silicon controlled Switch (SCR), a turn-off thyristor (GTO), an Insulated Gate Bipolar Transistor (IGBT), a magnetic switch, or the like.
Of course, any of the high-voltage and low-voltage driving circuits provided in the above embodiments of the present invention may also be used to drive other circuits or components, which will not be described in detail here.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A low-voltage input high-low voltage driving circuit, comprising:
the circuit comprises a first switching tube M1, a second switching tube M2, an inductor L1, a resistor rc, a first switch s1, a second switch s2, a third switch s3, a first power supply and a second power supply;
one end of the second switch tube M2 is connected to the first power supply, the other end of the second switch tube M2 is connected to one end of the first switch tube M1, the other end of the first switch tube M1 is grounded, and a connection between the second switch tube M2 and the first switch tube M1 serves as an output end of the high-low voltage driving circuit;
the first end of inductance L1 passes through first switch s1 with the second power is connected, the second end of inductance L1 passes through third switch s3 ground connection, the first end of inductance L1 still passes through second switch s2 ground connection, resistance rc with third switch s3 is parallelly connected, the second end of inductance L1 still with first switch tube M1 and the controlled end of second switch tube M2 is connected.
2. The circuit according to claim 1, wherein when the first switch s1 is closed, the second switch s2 is open and the third switch s3 is closed, the high-low voltage driving circuit is in a first working mode; when the first switch s1 is turned off, the second switch s2 is turned on, and the third switch s3 is turned off, the high-low voltage driving circuit is in a second working mode; and when the high-voltage and low-voltage driving circuit works, the high-voltage and low-voltage driving circuit is alternately in the first working mode and the second working mode.
3. A circuit according to claim 1 or 2, characterized in that the first, second and third switches s1, s2, s3 are controllable switches.
4. The circuit according to claim 3, further comprising a control module, connected to the first switch s1, the second switch s2 and the third switch s3 respectively, for controlling on/off of the first switch s1, the second switch s2 and the third switch s3 respectively, so that the high-low voltage driving circuit operates in the first operating mode and the second operating mode alternately.
5. The circuit of claim 4, wherein the control module is configured to periodically control the on/off of the first switch s1, the second switch s2, and the third switch s3 according to a preset time.
6. The circuit according to claim 4, wherein the control module is configured to determine on-off durations of the first switch s1, the second switch s2, and the third switch s3 according to an inductance of the inductor L1, a resistance of the resistor rc, an output voltage of the first power supply, an output voltage of the second power supply, duty ratios of the first switch tube and the second switch tube, and a charging target current of the inductor L1, and correspondingly control on-off of the first switch s1, the second switch s2, and the third switch s3 according to the determined on-off durations of the first switch s1, the second switch s2, and the third switch s 3.
7. The circuit according to claim 6, wherein the control module is configured to determine a duration of the high-low voltage driving circuit in the second working mode according to an inductance of the inductor L1, a resistance of the resistor rc, an output voltage of the first power supply, duty ratios of the first switching tube and the second switching tube, and a charging target current of the inductor L1; determining the duration of the high-low voltage driving circuit in the first working mode according to the inductance of the inductor L1, the output voltage of the second power supply, the charging target current of the inductor L1, and the current of the inductor L1 when the high-low voltage driving circuit is switched from the second working mode to the first working mode; and determining the on-off duration of the first switch s1, the second switch s2 and the third switch s3 according to the duration of the high-low voltage driving circuit in the second working mode and the duration of the high-low voltage driving circuit in the first working mode.
8. The circuit according to claim 1, wherein the second switch M2 is a P-channel fet and the first switch M1 is an N-channel fet.
9. The circuit according to claim 1, wherein the second switching tube M2 is a PNP transistor, and the first switching tube M1 is an NPN transistor.
10. The circuit of claim 1, wherein the high-low voltage driving circuit is used for driving a controllable switching tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210823207.3A CN115102376B (en) | 2022-07-14 | 2022-07-14 | Low-voltage input high-low voltage driving circuit |
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| CN202210823207.3A CN115102376B (en) | 2022-07-14 | 2022-07-14 | Low-voltage input high-low voltage driving circuit |
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| CN115102376A CN115102376A (en) | 2022-09-23 |
| CN115102376B true CN115102376B (en) | 2022-12-09 |
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| CN202210823207.3A Active CN115102376B (en) | 2022-07-14 | 2022-07-14 | Low-voltage input high-low voltage driving circuit |
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| CN118054651B (en) * | 2024-03-27 | 2024-06-18 | 苏州贝克微电子股份有限公司 | Low-power-consumption high-speed driving circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001061273A (en) * | 1999-08-19 | 2001-03-06 | Hitachi Ltd | Driver circuit |
| CN208434139U (en) * | 2018-07-26 | 2019-01-25 | 浙江绍兴苏泊尔生活电器有限公司 | heating circuit and induction cooker |
| CN215580886U (en) * | 2021-01-07 | 2022-01-18 | 上海辛格林纳新时达电机有限公司 | Drive circuit, circuit board assembly, and electronic device |
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2022
- 2022-07-14 CN CN202210823207.3A patent/CN115102376B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001061273A (en) * | 1999-08-19 | 2001-03-06 | Hitachi Ltd | Driver circuit |
| CN208434139U (en) * | 2018-07-26 | 2019-01-25 | 浙江绍兴苏泊尔生活电器有限公司 | heating circuit and induction cooker |
| CN215580886U (en) * | 2021-01-07 | 2022-01-18 | 上海辛格林纳新时达电机有限公司 | Drive circuit, circuit board assembly, and electronic device |
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| CN115102376A (en) | 2022-09-23 |
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