CN218482780U - Load power supply switch with adjustable output voltage rising slope - Google Patents
Load power supply switch with adjustable output voltage rising slope Download PDFInfo
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- CN218482780U CN218482780U CN202222811200.8U CN202222811200U CN218482780U CN 218482780 U CN218482780 U CN 218482780U CN 202222811200 U CN202222811200 U CN 202222811200U CN 218482780 U CN218482780 U CN 218482780U
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Abstract
The utility model relates to an automotive electronics trade technical field specifically discloses a load power supply switch with adjustable output voltage rising slope, including first MOS pipe, the triode, the second MOS pipe, first resistance, the second resistance, the third resistance, the fourth resistance, the fifth resistance, third electric capacity and diode, the one end and the control signal of second resistance are connected respectively to the grid of first MOS pipe, the one end of first resistance is connected respectively through the third resistance to the drain electrode of first MOS pipe, the positive pole of diode and the base of triode, the other end of first resistance, the power of control signal is all connected to the negative pole of diode and the one end of fourth resistance, the projecting pole of triode is connected to the other end of fourth resistance, the one end of fifth resistance is connected respectively to the collecting electrode of triode, the one end of third electric capacity and the grid of second MOS pipe. The utility model discloses can avoid appearing the power supply voltage sudden drop and lead to the unusual problem of whole equipment function.
Description
Technical Field
The utility model relates to an automotive electronics trade technical field, more specifically relates to a load power supply switch with adjustable output voltage rising slope.
Background
As shown in fig. 1, the device 1 (R1, R2, Q1, Q2 in fig. 1) is a conventional design, the left side C1 represents the output capacitance of the master board, the right side C2 represents the input capacitance of the slave board, and EN is controlled by the master board to output its own set of power to the load board.
Problems with the device 1: in the twinkling of an eye that Q1 switches on, supply terminal output capacitance C1 charges load capacitance C2, leads to two problems: firstly, the voltage of the power supply end suddenly drops, so that the function of the whole main control panel is abnormal; secondly, the charging and discharging surge current of the capacitor is too large, and the service life of the equipment is influenced.
Disclosure of Invention
In order to solve exist not enough among the prior art, the utility model provides a load power supply switch with adjustable output voltage slope that rises can popularize to capacitive load circuit's power supply control to reduce its impulse current constantly, avoid appearing the power supply voltage sudden drop and lead to whole equipment function abnormal's problem.
As a first aspect of the present invention, a load power supply switch with adjustable output voltage rising slope is provided, which includes a first MOS transistor Q1, a triode Q2, a second MOS transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, and a diode DZ1, wherein the first MOS transistor Q1, the triode Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the diode DZ1 constitute a controllable constant current source, the gate of the first MOS transistor Q1 is connected to one end of the second resistor R2 and a control signal EN, respectively, the source of the first MOS transistor Q1 is connected to the other end of the second resistor R2 and then grounded, the drain electrode of the first MOS transistor Q1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the first resistor R1, the anode of the diode DZ1 and the base electrode of the triode Q2, the other end of the first resistor R1, the cathode of the diode DZ1 and one end of the fourth resistor R4 are all connected to a power supply Vctrl of a control signal, the other end of the fourth resistor R4 is connected to the emitter electrode of the triode Q2, the collector electrode of the triode Q2 is connected to one end of the fifth resistor R5, one end of the third capacitor C3 and the gate electrode of the second MOS transistor Q3, the other end of the fifth resistor R5 and the other end of the third capacitor C3 are grounded after being connected, the drain electrode of the second MOS transistor Q3 is connected to the power supply Vin, and the source electrode of the second MOS transistor Q3 is connected to the power supply Vout of the capacitive load.
Further, the first MOS transistor Q1 and the second MOS transistor Q3 are both NMOS transistors.
Further, the diode DZ1 is a voltage regulator tube.
Further, the drain of the second MOS transistor Q3 is further connected to the first capacitor C1.
Further, the source of the second MOS transistor Q3 is also connected to a second capacitor C2.
The utility model provides a load power supply switch with adjustable output voltage rising slope has following advantage: the NMOS tube is adopted to replace a PMOS tube to serve as a main switch, the power supply rising slope is constant by utilizing a current source, the starting current is reduced, the problem that the function of the whole equipment is abnormal due to sudden voltage drop of a power supply end is solved, and the NMOS tube and the PMOS tube have the advantages of the following three aspects:
the method has the advantages that 1: the impact current is small and can be adjusted to be smaller than the normal load current;
the method has the advantages that: the power supply rising slope of the load voltage is constant and adjustable;
the method has the advantages that: the instantaneous voltage drop amplitude of the power supply terminal is small (based on the advantage 1).
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a circuit schematic diagram of a load power supply switch in the prior art.
Fig. 2 is a circuit diagram of the load power supply switch with adjustable output voltage rising slope according to the present invention.
Fig. 3 is a schematic diagram of the load power supply switch with adjustable output voltage rising slope according to the present invention.
Fig. 4 is a schematic diagram of the whole power-on and power-off process of the load power supply switch with adjustable output voltage rising slope.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the objects of the present invention, the following detailed description of the embodiments, structures, features and effects of the load power switch with adjustable output voltage rising slope according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the present embodiment, a load power supply switch with adjustable output voltage rising slope is provided, as shown in fig. 2-3, the load power supply switch with adjustable output voltage rising slope includes a first MOS transistor Q1, a triode Q2, a second MOS transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, and a diode DZ1, wherein the first MOS transistor Q1, the triode Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the diode DZ1 constitute a controllable constant current source, a gate of the first MOS transistor Q1 is connected to one end of the second resistor R2 and a control signal EN, respectively, a source of the first MOS transistor Q1 is connected to the other end of the second resistor R2 and then grounded, the drain electrode of the first MOS transistor Q1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the first resistor R1, the anode of the diode DZ1 and the base electrode of the triode Q2, the other end of the first resistor R1, the cathode of the diode DZ1 and one end of the fourth resistor R4 are all connected to a power supply Vctrl of a control signal, the other end of the fourth resistor R4 is connected to the emitter electrode of the triode Q2, the collector electrode of the triode Q2 is connected to one end of the fifth resistor R5, one end of the third capacitor C3 and the gate electrode of the second MOS transistor Q3, the other end of the fifth resistor R5 and the other end of the third capacitor C3 are grounded after being connected, the drain electrode of the second MOS transistor Q3 is connected to the power supply Vin, and the source electrode of the second MOS transistor Q3 is connected to the power supply Vout of the capacitive load.
The utility model provides a load power supply switch with adjustable output voltage slope that rises for solve the problem that meets in certain security protection radar design process, be used for capacitive load circuit's power supply control, in order to reduce its impulse current, avoid appearing the problem that the power supply terminal voltage suddenly falls and leads to whole equipment function abnormity.
Preferably, the first MOS transistor Q1 and the second MOS transistor Q3 are both NMOS transistors.
Preferably, the diode DZ1 is a voltage regulator tube.
Preferably, the drain of the second MOS transistor Q3 is further connected to a first capacitor C1.
Preferably, the source of the second MOS transistor Q3 is further connected to a second capacitor C2.
In particular, vin is the power supply (such as 5V, 3.3V internal to the controller); vout is a power supply of the capacitive load, and after power supply is stable, vout is the same as Vin; vctrl is a power supply of a control signal, and the voltage of Vctrl is 5V-15V (for example, 12V power supply) higher than that of Vin; EN is a control signal from the MCU, OFF is low and ON is high (typically 3.3V or 5V).
In particular, as shown in fig. 3, the output current I of the controllable constant current source Q2 Comprises the following steps: i is Q2 ＝(V DZ1 –V EB(Q2) )/R 4 (ii) a Wherein, I Q2 The current is output by the controllable constant current source, namely the emitter current of the triode Q2; v EB(Q2) Is the emitter-base voltage of the triode Q2, which is approximately constant at 0.7V; v DZ1 A clamping voltage of the zener diode DZ1, for example, 2.4V; it can be seen that the output current I of the controllable constant current source Q2 Can be adjusted by means of a fourth resistor R4.
The utility model provides a load power supply switch with adjustable output voltage slope that rises's theory of operation as follows: as shown in fig. 4, the power-up sequence is described as follows:
(1) The control signal EN is changed from OFF to ON, the controllable constant current source starts to work, and the controllable constant current source outputs constant current I Q2 ：I Q2 ＝(V DZ1 –V EB(Q2) )/R 4 ；
(2) The voltage V at both ends of the capacitor C3 is constant under the constant charging current (C3) Rising with a steady slope: v C3 ＝I Q2 *ΔT；
(3) Under the action of negative feedback, the output voltage V of the module OUT Also rising at a steady slope: v OUT ＝V C3 -V GS(Plateau) (ii) a Wherein, V C3 Is the voltage of capacitor C3; v GS(Plateau) The voltage of a Miller platform is a control signal of an MOS tube Q3; v OUT A supply voltage that is a capacitive load; Δ V OUT /ΔT＝ΔV C3 Δ T, constant value; thus the output voltage V OUT Also rises with a steady slope;
(4) The current I is the variation of the charge Q, so that the inrush current I is at the moment of start STA Comprises the following steps: i is START ＝ΔQ/ΔT＝(C 2 *ΔV OUT )/ΔT＝C 2 *(ΔV OUT At); it can be seen that at the output voltage V OUT During the rising edge of (2), the inrush current I at the moment of start-up START Is constant and can pass through the output voltage V OUT Is adjusted by the rising slope of the valve.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (5)
1. A load power supply switch with adjustable output voltage rising slope is characterized by comprising a first MOS tube Q1, a triode Q2, a second MOS tube Q3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3 and a diode DZ1, wherein the first MOS tube Q1, the triode Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the diode DZ1 form a controllable constant current source, the grid electrode of the first MOS tube Q1 is respectively connected with one end of the second resistor R2 and a control signal EN, the source electrode of the first MOS tube Q1 is connected with the other end of the second resistor R2 and then grounded, the drain electrode of the first MOS tube Q1 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with one end of the first resistor R1, the anode of the diode DZ1 and the base electrode of the triode Q2, the other end of the first resistor R1, the cathode of the diode DZ1 and one end of the fourth resistor R4 are respectively connected with a power supply Vctrl of a control signal, the other end of the fourth resistor R4 is connected with the emitting electrode of the triode Q2, the collecting electrode of the triode Q2 is respectively connected with one end of the fifth resistor R5, one end of the third capacitor C3 and the grid electrode of the second MOS transistor Q3, the other end of the fifth resistor R5 and the other end of the third capacitor C3 are grounded after being connected, the drain electrode of the second MOS transistor Q3 is connected with a power supply Vin, and the source electrode of the second MOS transistor Q3 is connected with a power supply Vout of a capacitive load.
2. The load-powered switch of claim 1, wherein the first MOS transistor Q1 and the second MOS transistor Q3 are NMOS transistors.
3. The switch of claim 1, wherein the diode DZ1 is a zener diode.
4. The load power switch as claimed in claim 1, wherein the drain of the second MOS transistor Q3 is further connected to a first capacitor C1.
5. The load supply switch according to claim 1, wherein the source of the second MOS transistor Q3 is further connected to a second capacitor C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222811200.8U CN218482780U (en) | 2022-10-25 | 2022-10-25 | Load power supply switch with adjustable output voltage rising slope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222811200.8U CN218482780U (en) | 2022-10-25 | 2022-10-25 | Load power supply switch with adjustable output voltage rising slope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218482780U true CN218482780U (en) | 2023-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222811200.8U Active CN218482780U (en) | 2022-10-25 | 2022-10-25 | Load power supply switch with adjustable output voltage rising slope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218482780U (en) |
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2022
- 2022-10-25 CN CN202222811200.8U patent/CN218482780U/en active Active
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