CN214544102U - Circuit for improving driving capability of power driving chip and power supply - Google Patents
Circuit for improving driving capability of power driving chip and power supply Download PDFInfo
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- CN214544102U CN214544102U CN202120520405.3U CN202120520405U CN214544102U CN 214544102 U CN214544102 U CN 214544102U CN 202120520405 U CN202120520405 U CN 202120520405U CN 214544102 U CN214544102 U CN 214544102U
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Abstract
The utility model relates to a circuit for improving the driving capability of a power driving chip, which comprises a compensation module for automatically providing an additional current channel or a grounding channel when the rising edge and the falling edge of a driving signal output by the power driving chip arrive; the compensation module is arranged between the driving signal output end of the power driving chip and the switching device driven by the driving signal; the compensation module automatically disconnects the additional current path or the ground path during the level maintenance of the driving signal. The utility model discloses still relate to a power. Implement the utility model discloses an improve circuit and power of power drive chip driving force has following beneficial effect: the driving capacity of the driving chip can be improved, and the driving waveform is not influenced.
Description
Technical Field
The utility model relates to a power electronics, more specifically say, relate to a circuit and power of improving power drive chip driving force.
Background
In a switching power supply, a driving chip is usually used to drive a switching device. The driving chip generates or processes a driving signal under the action of a control unit (usually a microprocessor or a DSP) (or the driving chip and the control unit are arranged on one chip), so that the driving chip has certain load carrying capacity, and transmits the driving signal to the switching device, so that the switching device is continuously switched on and off according to the waveform of the driving signal, and the output of the set voltage is realized. Since the driving chip is designed for a set use occasion, in some use scenes, the problem of insufficient driving capability may occur. In other words, a particular driver chip may not be usable in some usage scenarios. To solve this problem, only circuits for improving the driving capability can be added to the outside of the device to save cost. However, the increased circuits may bring certain changes to the driving waveforms output by the driving chip, so that the performance of the subsequent switching circuit is degraded, and even the state of the subsequent switching device may be affected.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned driving force of prior art not enough, influence the defect of drive waveform, provide one kind can improve drive chip's driving force, can not influence the circuit and the power of drive waveform's improvement power drive chip driving force.
The utility model provides a technical scheme that its technical problem adopted is: the circuit for improving the driving capability of the power driving chip is constructed, and comprises a compensation module which automatically provides an additional current channel or a ground channel when the rising edge and the falling edge of a driving signal output by the power driving chip arrive; the compensation module is arranged between the driving signal output end of the power driving chip and the switching device driven by the driving signal; the compensation module automatically disconnects the additional current path or the ground path during the level maintenance of the driving signal.
Furthermore, the compensation module comprises an input end, an output end, a power end and a grounding end; the input end is connected with the driving signal output end of the power driving chip, and the output end is connected with the control end of the switching device.
Still further, the compensation module includes a first transistor, a second transistor, and a first resistor; bases of the first transistor and the second transistor are connected in parallel and are connected with an input end of the compensation module, emitters of the first transistor and the second transistor are connected in parallel and are connected with an output end of the compensation module, and two ends of the first resistor are respectively connected with the input end and the output end of the compensation module; the collector of the first transistor is connected with a power supply end, and the collector of the second transistor is grounded.
Still further, the first transistor comprises an NPN transistor, and the second transistor comprises a PNP transistor.
Furthermore, the value range of the first resistor is 0.2-200 ohms.
Furthermore, the driving signal output by the power driving chip comprises a pulse signal with a certain duty ratio.
Still further, the switching device includes a field effect transistor or a MOS transistor.
Furthermore, one driving signal output end of the power driving chip drives a plurality of switching devices connected in parallel.
The utility model discloses still relate to a power, including the power drive chip, the at least one drive signal of power drive chip output realizes controlling the switching device on connecting the output of exporting this drive signal, drive signal's output with be provided with the circuit that improves the power drive chip driving force between the switching device, the circuit is foretell circuit of improving the power drive chip driving force.
Implement the utility model discloses an improve circuit and power of power drive chip driving force has following beneficial effect: because the circuit is provided with the compensation module which is automatically switched on or switched off according to the waveform of the driving signal, when a larger current channel or ground channel is needed, an additional current channel or ground channel can be automatically added into a transmission path from the driving chip to the switching device; when the current is not needed, the extra current channel or the grounding channel is automatically disconnected, so that the driving chip is not influenced. That is, the state of the compensation module changes with the change of the driving signal waveform, so that the driving capability is improved while the compensation module does not affect or minimally affects the driving chip, and therefore, the driving capability of the driving chip can be improved without affecting the driving waveform.
Drawings
FIG. 1 is a schematic diagram of a circuit for improving the driving capability of a power driving chip according to an embodiment of the present invention;
fig. 2 is a circuit diagram of the circuit in the embodiment.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1 and fig. 2, in the circuit embodiment of the present invention for improving the driving capability of the power driver chip, the circuit includes a compensation module for automatically providing an additional current path or a ground path when the rising edge and the falling edge of the driving signal outputted by the power driver chip arrive; the compensation module is arranged between the driving signal output end of the power driving chip and the switching device driven by the driving signal; the compensation module automatically disconnects the additional current path or the ground path during the level maintenance of the driving signal. In other words, in the present embodiment, a compensation module is disposed between the output port of the driving signal of the driving chip and the switching device driven by the driving signal, and the compensation module provides an additional current path or ground path disposed outside the driving chip to increase the load carrying capacity of the driving signal output port. When the current state of the driving signal is detected, the compensation module can automatically realize the connection and disconnection of the current channel or the grounding channel, and when the load capacity is increased, the external compensation module has little influence or no influence on the waveform of the driving signal transmitted between the driving chip and the switching device.
In fig. 1, when the compensation module is considered as a whole, the compensation module includes an input terminal, an output terminal, a power terminal, and a ground terminal; the input end is connected with the driving signal output end of the power driving chip, the output end is connected with the control end of the switching device, and the power end and the grounding end of the switching device are respectively connected with the power supply and the ground to provide a current loop for the compensation module. The compensation module described above in this embodiment at least performs two functions: at the moment when the current compensation is needed, an additional current channel or a ground channel is provided, so that the impact from the load is not or basically not transmitted to the driving chip, but is borne by the additional current channel or the ground channel in the transmission diagram; the other function is that when the current compensation is mostly not needed, the extra current channel or the grounding channel is automatically disconnected, and the driving waveform is transmitted through the directly transmitted channel of the compensation module without influencing the waveform of the driving signal. This is one of the different places between the solution in the present embodiment and the existing compensation or improvement solution.
In this embodiment, fig. 2 shows a specific circuit structure of the compensation module in a case where the structure preferably implements the above-described functions. Specifically, the compensation module includes a first transistor Q3, a second transistor Q4, and a first resistor R3; the bases of the first transistor Q3 and the second transistor Q4 are connected in parallel and are connected with the input end of the compensation module (i.e. are electrically connected with the driving signal output end of the driving chip), the emitters of the first transistor Q3 and the second transistor Q4 are connected in parallel and are connected with the output end of the compensation module, and two ends of the first resistor R3 are respectively connected with the input end and the output end of the compensation module; the collector of the first transistor Q3 is connected to a power supply terminal or the collector of the first transistor Q3 is connected to a power supply terminal through a resistor, and the collector of the second transistor Q4 is grounded. Specifically, the first transistor Q3 includes an NPN transistor, and the second transistor Q4 includes a PNP transistor. In fig. 2, the first resistor R3 is a resistor with a small resistance value, and may be made of various existing materials, such as wire-wound resistor or carbon film resistor; the two ends of the first resistor R3 are respectively connected between the base and emitter of the first transistor Q3 and the second transistor Q4, which itself forms a transmission channel between the input and output of the compensation module; meanwhile, since the driving signal output by the power driving chip in this embodiment is a pulse signal with a certain duty ratio, such a driving signal is composed of a plurality of pulses, and one pulse has a rising edge, a falling edge, and a pulse top located between the rising edge and the falling edge; in the two periods of time of the rising edge and the falling edge of the driving signal waveform output by the driving chip, because the driving current ratio of the driving chip is larger, the voltage drop generated when the driving current flows through the first resistor R3 is enough to turn on the first transistor Q3 or the second transistor Q4, so that the purpose of providing an additional current channel or a grounding channel to enhance the driving capability is achieved; when the driving signal waveform is at a high level, that is, at the top of the driving pulse, because the driving current output by the driving chip is relatively small, the voltage drop generated when the driving current flows through R3 is not enough to turn on the first transistor Q3 or the second transistor Q4, at this time, the driving signal is transmitted to the control terminal of the switching device through the first resistor R3, and the current channel or the ground channel is automatically turned off, so that the top of the driving waveform transmitted to the switching device is consistent with the output waveform of the driving waveform output terminal of the driving chip. Specifically, on the rising edge of the pulse of the above-mentioned drive waveform, the first transistor Q3 is turned on, providing an additional current path; at the pulse falling edge of the driving waveform, the second transistor Q4 is turned on, providing an additional ground path.
In this embodiment, the value of the first resistor R3 ranges from 0.2 to 200 ohms. The resistance value within this range can ensure that sufficient voltage is generated at the rising edge and the falling edge to turn on the first transistor Q3 or the ground transistor Q4, and thus, the transmission of the driving signal is not greatly affected at the top of the pulse.
It is worth mentioning that although the switching device shown in fig. 2 is a MOS transistor, in some cases, the switching device may also include a field effect transistor. Meanwhile, in the driving chip shown in fig. 2, there are two driving waveform outputs, and the switching devices corresponding to the two driving waveforms may be independent or have a certain relationship, for example, a bridge arm with a dead zone is complementary or formed, and the like. In fig. 2, each driving signal drives one switching device, but in other cases in this embodiment, one driving signal output terminal of the power driving chip may drive a plurality of switching devices connected in parallel.
The utility model discloses still relate to a power, including the power drive chip, the at least one drive signal of power drive chip output realizes controlling the switching device on connecting the output of exporting this drive signal, drive signal's output with be provided with the circuit that improves the power drive chip driving force between the switching device, the circuit is foretell circuit of improving the power drive chip driving force.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A circuit for improving the driving capability of a power driving chip is characterized by comprising a compensation module which automatically provides an additional current channel or a grounding channel when the rising edge and the falling edge of a driving signal output by the power driving chip arrive; the compensation module is arranged between the driving signal output end of the power driving chip and the switching device driven by the driving signal; the compensation module automatically disconnects the additional current path or the ground path during the level maintenance of the driving signal.
2. The circuit for improving the driving capability of a power driving chip as claimed in claim 1, wherein the compensation module comprises an input terminal, an output terminal, a power terminal and a ground terminal; the input end is connected with the driving signal output end of the power driving chip, and the output end is connected with the control end of the switching device.
3. The circuit for improving the driving capability of a power supply driving chip as claimed in claim 2, wherein the compensation module comprises a first transistor, a second transistor and a first resistor; bases of the first transistor and the second transistor are connected in parallel and are connected with an input end of the compensation module, emitters of the first transistor and the second transistor are connected in parallel and are connected with an output end of the compensation module, and two ends of the first resistor are respectively connected with the input end and the output end of the compensation module; the collector of the first transistor is connected with a power supply end, and the collector of the second transistor is grounded.
4. The circuit for improving the driving capability of a power supply driving chip as claimed in claim 3, wherein the first transistor comprises an NPN transistor, and the second transistor comprises a PNP transistor.
5. The circuit for improving the driving ability of a power driver chip as claimed in claim 4, wherein the first resistor has a value in the range of 0.2-200 ohms.
6. The circuit for improving the driving capability of a power driving chip according to any one of claims 1 to 5, wherein the driving signal output by the power driving chip comprises a pulse signal with a duty ratio.
7. A circuit for improving the driving ability of a power driving chip according to any one of claims 1 to 5, wherein the switching device comprises a field effect transistor or a MOS transistor.
8. The circuit for improving the driving ability of a power driver chip as claimed in claim 7, wherein a driving signal output terminal of the power driver chip drives a plurality of switching devices connected in parallel.
9. A power supply comprising a power driver chip, said power driver chip outputting at least one driving signal for controlling a switching device connected to an output terminal outputting the driving signal, wherein a circuit for improving the driving capability of the power driver chip is provided between the output terminal of the driving signal and the switching device, and said circuit is the circuit as claimed in claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120520405.3U CN214544102U (en) | 2021-03-11 | 2021-03-11 | Circuit for improving driving capability of power driving chip and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120520405.3U CN214544102U (en) | 2021-03-11 | 2021-03-11 | Circuit for improving driving capability of power driving chip and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214544102U true CN214544102U (en) | 2021-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120520405.3U Ceased CN214544102U (en) | 2021-03-11 | 2021-03-11 | Circuit for improving driving capability of power driving chip and power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214544102U (en) |
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2021
- 2021-03-11 CN CN202120520405.3U patent/CN214544102U/en not_active Ceased
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Decision date of declaring invalidation: 20221201 Decision number of declaring invalidation: 59342 Granted publication date: 20211029 |
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| IW01 | Full invalidation of patent right |