Logic power switch circuit realized based on MOS (Metal Oxide Semiconductor) transistor

Abstract

The utility model provides a logic power switch circuit realized based on an MOS transistor, the logic power switch circuit comprises an MOS transistor, a triode, a resistor and a capacitor, the MOS transistor controls the output on and off of a power supply, and the G pole of the MOS transistor has appropriate voltage; the triode controls generation of voltage of the G electrode of the MOS transistor, the E electrode of the triode has appropriate negative voltage, the resistor is used for voltage division of the circuit, and the capacitor is used for soft start of the switch to avoid current surge. Under the condition that normal logic power switch control is realized, parallel control of power circuit output can be realized, input power sharing is realized, and circuit cost and size are saved; meanwhile, the circuit is simple in structure and can be manufactured in batches by adopting a simple printed circuit board process.

Description

Technical Field

[0001] The utility model relates to the field of circuit design, in particular to a logic power switch circuit implemented based on a MOS tube. Background Art

[0002] Microwave and millimeter-wave circuits typically use chips with both positive and negative power inputs, such as amplifiers, mixers, and hybrid multifunction circuits. These devices and circuits must first turn on the negative power, followed by the positive power. Otherwise, if the positive power is turned on first, the device or circuit will default to the negative pin at 0V, which will cause a very high static current in the positive power, easily burning out the device or circuit. To avoid burning out the device or circuit, a logic circuit must be designed to control the power on and off sequence. This is the design of a logic power switch circuit. Another common circuit situation is that multiple devices have the same positive power, and the current is not very large. In this case, several chips can share the output of a single power chip, greatly reducing circuit cost and size. In this case, a parallel logic control circuit is required to share the power input without affecting the switching of each circuit. Utility Model Content

[0003] The purpose of the utility model is to provide a logic power switch circuit design based on MOS tube, which solves the circuit logic switch problem. The negative voltage can be turned on first, and then the negative voltage can be used to control the positive voltage output. At the same time, this design can also output MOS tube circuits in parallel, sharing the power input while independently controlling each circuit switch.

[0004] To achieve the above objectives, the present invention proposes the following technical solution: a logic power switch circuit implemented based on a MOS tube, comprising:

[0005] A MOS transistor, wherein the MOS transistor controls the output of the power supply to be turned on and off, and the G pole of the MOS transistor has a suitable voltage;

[0006] A triode, the triode controls the generation of the G-pole voltage of the MOS transistor, and the E-pole of the triode has a suitable negative voltage;

[0007] The resistor and capacitor are used to divide the voltage of the circuit, and the capacitor is used for soft start of the switch to avoid current surge.

[0008] Furthermore, the present invention also includes a plurality of parallel output circuits, each of which uses a MOS transistor to control output on and off, and has one power input.

[0009] Furthermore, in the present invention, the transistor is an NPN or PNP transistor, and through an analog circuit arrangement, the input of the B pole, E pole or C pole of the transistor is controlled to control the on and off of the transistor, thereby controlling the on and off of the MOS transistor.

[0010] Beneficial effects: The technical solution of this application has the following technical effects:

[0011] While achieving normal logic power switch control, this circuit can also realize parallel control of power circuit output, share input power, and save circuit cost and size. At the same time, the circuit structure is simple and can be mass-produced using a simple printed circuit board process.

[0012] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of this disclosure, provided such concepts are not mutually inconsistent.

[0013] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will become apparent from the following description or through practice of specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0015] Figure 1 This is the schematic diagram of the logic power switch circuit implemented based on MOS tube;

[0016] Figure 2 This is the schematic diagram of the parallel control power supply circuit of the logic power switch circuit implemented based on MOS tube;

[0017] Figure 3 This is an example circuit PCB board of a logic power switch circuit implemented based on MOS tube. DETAILED DESCRIPTION

[0018] To better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows. In this disclosure, various aspects of the present utility model are described with reference to the drawings, and many illustrative embodiments are shown in the drawings. The embodiments of this disclosure do not necessarily define all aspects of the present utility model. It should be understood that the various concepts and embodiments introduced above, as well as those concepts and implementation manners described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present utility model are not limited to any implementation manner. In addition, some aspects disclosed in the present utility model can be used alone, or in any suitable combination with other aspects disclosed in the present utility model.

[0019] A logic power switch circuit implemented based on MOS transistors, including MOS transistors, triodes, resistors, and capacitors. The MOS transistor controls the on and off of the power output, and there is a suitable voltage at the G pole of the MOS transistor; the triode controls the generation of the voltage at the G pole of the MOS transistor, and there is a suitable negative voltage at the E pole of the triode. The resistor is used for voltage division of the circuit, and the capacitor is used for soft start of the switch to avoid current surges.

[0020] It further includes multiple parallel output circuits. Each output circuit uses one MOS transistor to control the on and off of the output, and there is one power input.

[0021] The triode is an NPN-type or PNP-type triode. By means of a similar circuit arrangement, the on and off of the triode are controlled by controlling the input of the B pole, E pole, or C pole of the triode, and thus the on and off of the MOS transistor are controlled.

[0022] As Figure 1 Shown is the schematic diagram of the parallel control power circuit of the logic power switch circuit implemented based on MOS transistors. The control logic is: when the absolute value of Vg (negative voltage) is large enough to reach a certain value, the triode is turned on. At this time, the G pole of the MOS transistor is connected to the C pole of the triode to form a path, and when the Vgs value is large enough to turn on the MOS transistor, the positive power can be output; when Vg is turned off or less than a certain value, the triode is turned off, the G pole of the MOS transistor is suspended, the MOS transistor is not turned on, and the positive power cannot be output.

[0023] Figure 2 It is the schematic diagram of the parallel control power circuit of the logic power switch circuit implemented based on MOS transistors. By paralleling multiple MOS transistor power switch circuits, while realizing the power logic control, the input power is shared.

[0024] Figure 3 It is an example circuit PCB board of the logic power switch circuit implemented based on MOS transistors. This circuit board is a 28V or 50V logic power control circuit board, and the power input, negative power (Vg) generation circuit, MOS transistor, and triode power switch circuit are clearly marked on the drawing.

[0025] In summary, while achieving normal logic power switch control, this circuit can also realize parallel control of power circuit output, share input power, and save circuit cost and size. At the same time, the circuit structure is simple and can be mass-produced using a simple printed circuit board process.

[0026] The standard parts used in this application document can all be purchased from the market, and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field. In addition, this application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0027] While the present invention has been described above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A logic power switch circuit implemented based on MOS transistors, characterized in that: Including: A MOS transistor that controls the on and off of the power supply output, and the G pole of the MOS transistor has a suitable voltage; A triode that controls the generation of the G pole voltage of the MOS transistor, and the E pole of the triode has a suitable negative voltage; Resistors and capacitors, where the resistors are used for voltage division in the circuit, and the capacitors are used for soft start of the switch to avoid current surges.

2. The logic power switch circuit implemented based on MOS transistors according to claim 1, wherein: It further includes multiple parallel output circuits, each output circuit uses a MOS transistor to control the output on and off, and there is one power input.

3. A logic power switch circuit implemented based on MOS transistors according to claim 1, characterized in that: The triode is an NPN type or PNP type triode. Through a similar circuit arrangement, controlling the input of the B pole, E pole or C pole of the triode to control the on and off of the triode, and further controlling the on and off of the MOS transistor.

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