CN206759407U - Switch driving circuit - Google Patents
Switch driving circuit Download PDFInfo
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- CN206759407U CN206759407U CN201720272646.4U CN201720272646U CN206759407U CN 206759407 U CN206759407 U CN 206759407U CN 201720272646 U CN201720272646 U CN 201720272646U CN 206759407 U CN206759407 U CN 206759407U
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Abstract
本实用新型公开了一种开关驱动电路，包括：开关管、串联二极管组和电容；所述串联二极管组包括至少一个二极管；所述开关驱动电路包括用于接收控制所述开关管打开或关闭的信号的驱动检测端；所述开关驱动电路的驱动检测端与所述串联二极管组的正极连接，所述串联二极管组的负极与所述开关管的控制端连接；所述电容的一端与所述驱动检测端连接，所述电容的另一端与所述串联二极管组的负极连接；所述开关管的输入端用于与输入信号，所述开关管的输出端与地连接。采用本实用新型，能快速开通或关断MOS管。
The utility model discloses a switch driving circuit, comprising: a switch tube, a series diode group and a capacitor; the series diode group includes at least one diode; The drive detection end of the signal; the drive detection end of the switch drive circuit is connected to the anode of the series diode group, and the cathode of the series diode group is connected to the control end of the switch tube; one end of the capacitor is connected to the The drive detection end is connected, the other end of the capacitor is connected to the cathode of the series diode group; the input end of the switch tube is used for input signal, and the output end of the switch tube is connected to the ground. By adopting the utility model, the MOS tube can be quickly turned on or off.
Description
技术领域technical field
本实用新型涉及场效应晶体管驱动技术领域，具体涉及一种开关驱动电路。The utility model relates to the field effect transistor drive technology field, in particular to a switch drive circuit.
背景技术Background technique
对于采用场效应晶体管进行开关驱动的常用电路，即通过场效应晶体管的导通与否输出相应的控制信号给受控的电路，如图1所示，其为常用的场效应晶体管驱动控制电路，通过设定开通电阻R401的大小，可改变场效应晶体管Q1的开通速度，同时改变与开通电阻R401并联的电阻R402的大小来改变关断的速度。但是，上述方案在要求迅速关断的电路中，应用优势不明显。For the commonly used circuits that use field effect transistors for switch drive, that is, output corresponding control signals to the controlled circuits through the conduction of the field effect transistors, as shown in Figure 1, which is a commonly used field effect transistor drive control circuit. By setting the size of the turn-on resistor R401, the turn-on speed of the field effect transistor Q1 can be changed, and at the same time, the turn-off speed can be changed by changing the size of the resistor R402 connected in parallel with the turn-on resistor R401. However, the above solution has no obvious application advantages in circuits that require rapid shutdown.
实用新型内容Utility model content
本实用新型的目的是，提供一种开关驱动电路，能快速开通或关断MOS管。The purpose of the utility model is to provide a switch driving circuit, which can quickly turn on or turn off the MOS tube.
为解决以上技术问题，本实用新型实施例提供一种开关驱动电路，包括：开关管、串联二极管组和电容；所述串联二极管组包括至少一个二极管；In order to solve the above technical problems, an embodiment of the utility model provides a switch drive circuit, including: a switch tube, a series diode group and a capacitor; the series diode group includes at least one diode;
所述开关驱动电路包括用于接收控制所述开关管打开或关闭的信号的驱动检测端；The switch drive circuit includes a drive detection terminal for receiving a signal for controlling the switch tube to be turned on or off;
所述开关驱动电路的驱动检测端与所述串联二极管组的正极连接，所述串联二极管组的负极与所述开关管的控制端连接；所述电容的一端与所述驱动检测端连接，所述电容的另一端与所述串联二极管组的负极连接；所述开关管的输入端用于与输入信号，所述开关管的输出端与地连接。The drive detection terminal of the switch drive circuit is connected to the anode of the series diode group, and the cathode of the series diode group is connected to the control terminal of the switch tube; one end of the capacitor is connected to the drive detection terminal, so The other end of the capacitor is connected to the cathode of the series diode group; the input end of the switch tube is used for input signal, and the output end of the switch tube is connected to the ground.
进一步地，所述开关驱动电路还包括连接于所述串联二极管组的负极与所述开关管的控制端之间的第一电阻和连接于所述开关管的控制端与输出端之间的第二电阻。Further, the switch drive circuit further includes a first resistor connected between the cathode of the series diode group and the control terminal of the switch tube, and a first resistor connected between the control terminal and the output terminal of the switch tube. Two resistors.
优选地，所述串联二极管组为由两个二极管串联构成的器件。Preferably, the series diode group is a device composed of two diodes connected in series.
优选地，所述开关管为N沟道MOS管；其中，所述开关管的控制端为N沟道MOS管的栅极，所述开关管的输入端为N沟道MOS管的漏极，所述开关管的输出端为N沟道MOS管的源极。相比于现有技术，本实用新型的一种开关驱动电路的有益效果在于：Preferably, the switch tube is an N-channel MOS tube; wherein, the control terminal of the switch tube is the gate of the N-channel MOS tube, and the input terminal of the switch tube is the drain of the N-channel MOS tube, The output end of the switch tube is the source of the N-channel MOS tube. Compared with the prior art, the beneficial effects of a switch drive circuit of the present invention are:
本实用新型提供的开关驱动电路，通过增加串联二极管组和电容，并设置串联二极管组和电容并联，通过电容的电压维持原理，使得在关断时电容的负电压加载在开关管上，可迅速使得开关管关断。The switch driving circuit provided by the utility model adds a series diode group and a capacitor, and sets the series diode group and the capacitor in parallel, and through the voltage maintenance principle of the capacitor, the negative voltage of the capacitor is loaded on the switch tube when it is turned off. turn off the switch tube.
附图说明Description of drawings
图1是现有技术的一种开关驱动电路的结构示意图；Fig. 1 is a structural schematic diagram of a switch driving circuit in the prior art;
图2是本实用新型提供的开关驱动电路的一个实施例的结构示意图。Fig. 2 is a schematic structural diagram of an embodiment of the switch driving circuit provided by the present invention.
具体实施方式detailed description
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本实用新型保护的范围。The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.
请参阅图2，是本实用新型提供的开关驱动电路的一个实施例的结构示意图；Please refer to Fig. 2, which is a schematic structural diagram of an embodiment of the switch drive circuit provided by the present invention;
本实用新型实施例提供一种开关驱动电路，包括：开关管Q1、串联二极管组D1和电容C1；所述串联二极管组D1包括至少一个二极管；The embodiment of the utility model provides a switch driving circuit, including: a switch tube Q1, a series diode group D1 and a capacitor C1; the series series diode group D1 includes at least one diode;
所述开关驱动电路包括用于接收控制所述开关管Q1打开或关闭的信号的驱动检测端Gate；The switch drive circuit includes a drive detection terminal Gate for receiving a signal for controlling the switch tube Q1 to be turned on or off;
所述开关驱动电路的驱动检测端Gate与所述串联二极管组D1的正极连接，所述串联二极管组D1的负极与所述开关管Q1的控制端连接；所述电容C1的 一端与所述驱动检测端Gate连接，所述电容C1的另一端与所述串联二极管组D1的负极连接；所述开关管Q1的输入端D-in用于与输入信号，所述开关管Q1的输出端与地连接。The drive detection terminal Gate of the switch drive circuit is connected to the anode of the series diode group D1, and the cathode of the series diode group D1 is connected to the control terminal of the switch tube Q1; one end of the capacitor C1 is connected to the drive The detection terminal Gate is connected, and the other end of the capacitor C1 is connected to the cathode of the series diode group D1; the input terminal D-in of the switch tube Q1 is used for input signal, and the output terminal of the switch tube Q1 is connected to the ground connect.
进一步地，所述开关驱动电路还包括连接于所述串联二极管组D1的负极与所述开关管Q1的控制端之间的第一电阻R1和连接于所述开关管Q1的控制端与输出端之间的第二电阻R2。Further, the switch drive circuit further includes a first resistor R1 connected between the cathode of the series diode group D1 and the control terminal of the switch transistor Q1, and a first resistor R1 connected to the control terminal and the output terminal of the switch transistor Q1 between the second resistor R2.
优选地，所述串联二极管组D1为由两个二极管串联构成的器件。由两个串联二极管组D1串联而成，使得与所述串联二极管组D1并联的电容C1约为1.4V，确保开关管Q1导通时的电压值。Preferably, the series diode group D1 is a device composed of two diodes connected in series. It is composed of two series diode groups D1 connected in series, so that the capacitor C1 connected in parallel with the series diode group D1 is about 1.4V, so as to ensure the voltage value when the switch tube Q1 is turned on.
优选地，所述开关管Q1为N沟道MOS管；其中，所述开关管Q1的控制端为N沟道MOS管的栅极，所述开关管Q1的输入端D-in为N沟道MOS管的漏极，所述开关管Q1的输出端为N沟道MOS管的源极。Preferably, the switching transistor Q1 is an N-channel MOS transistor; wherein, the control terminal of the switching transistor Q1 is the gate of the N-channel MOS transistor, and the input terminal D-in of the switching transistor Q1 is an N-channel MOS transistor. The drain of the MOS transistor, and the output terminal of the switching transistor Q1 is the source of the N-channel MOS transistor.
以下将图2描述本实用新型提供的开关驱动电路的工作原理：The working principle of the switch drive circuit provided by the utility model is described below with Fig. 2:
当所述开关驱动电路的驱动检测端Gate由低电平变为高电平时，电容C1相当于短路，为电容C1充电，电容C1的电压为串联二极管组D1的压降，作为N沟道MOS管的开关管Q1的栅极此时的电压为高电平，开关管Q1导通。When the drive detection terminal Gate of the switch drive circuit changes from a low level to a high level, the capacitor C1 is equivalent to a short circuit, charging the capacitor C1, and the voltage of the capacitor C1 is the voltage drop of the series diode group D1, which acts as an N-channel MOS The gate voltage of the switching tube Q1 is at a high level at this time, and the switching tube Q1 is turned on.
当所述开关驱动电路的驱动检测端Gate由高电平变为低电平时，由于电容C1的电压为串联二极管组D1的压降值，电容C1的电压不能突变，也就相当于电容C1的电压较低一侧的负压加到开关管Q1的栅极和源极之间，加快开关的关断，通过增加负压关断比普通的改变阻值来关断的速度快很多。When the drive detection terminal Gate of the switch driving circuit changes from a high level to a low level, since the voltage of the capacitor C1 is the voltage drop value of the series diode group D1, the voltage of the capacitor C1 cannot change suddenly, which is equivalent to the voltage of the capacitor C1 The negative voltage on the lower side of the voltage is applied between the gate and the source of the switch tube Q1 to speed up the turn-off of the switch. Turning off by increasing the negative pressure is much faster than changing the resistance value.
本实用新型提供的开关驱动电路，通过增加串联二极管组和电容，并设置串联二极管组和电容并联，通过电容的电压维持原理，使得在关断时电容的负电压加载在开关管上，可迅速使得开关管关断。The switch driving circuit provided by the utility model adds a series diode group and a capacitor, and sets the series diode group and the capacitor in parallel, and through the voltage maintenance principle of the capacitor, the negative voltage of the capacitor is loaded on the switch tube when it is turned off. turn off the switch tube.
以上所述是本实用新型的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本实用新型原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本实用新型的保护范围。The foregoing is a preferred embodiment of the present utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, some improvements and modifications can also be made. These improvements and modifications It is also regarded as the protection scope of the present utility model.
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| CN201720272646.4U CN206759407U (en) | 2017-03-20 | 2017-03-20 | Switch driving circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111478561A (en) * | 2020-04-30 | 2020-07-31 | 陕西亚成微电子股份有限公司 | Peak value eliminating method and circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111478561A (en) * | 2020-04-30 | 2020-07-31 | 陕西亚成微电子股份有限公司 | Peak value eliminating method and circuit |
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Effective date of registration: 20250401 Address after: Room 05-4, 9th Floor, Building 02, Yinjiu Technology Industrial Park (Phase II), No. 35 Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province 430000 Patentee after: Wuhan Jingzhong Technology Co.,Ltd. Country or region after: China Address before: 510530 No. 6, Yun Po four road, Whampoa District, Guangzhou, Guangdong. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited Country or region before: China |