CN115276625A - Switch control circuit - Google Patents
Switch control circuit Download PDFInfo
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- CN115276625A CN115276625A CN202210939864.4A CN202210939864A CN115276625A CN 115276625 A CN115276625 A CN 115276625A CN 202210939864 A CN202210939864 A CN 202210939864A CN 115276625 A CN115276625 A CN 115276625A
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- 230000001629 suppression Effects 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000005669 field effect Effects 0.000 description 20
- 238000004088 simulation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
- H03K17/08104—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit in field-effect transistor switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/32—Circuit design at the digital level
- G06F30/33—Design verification, e.g. functional simulation or model checking
- G06F30/3308—Design verification, e.g. functional simulation or model checking using simulation
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a switch control circuit, which comprises a switch circuit, a current surge suppression circuit and a control circuit, wherein the input of the switch circuit is connected with a direct current input, the output of the switch circuit is connected with a direct current output, the input of the current surge suppression circuit is connected with the direct current input, the output of the current surge suppression circuit is connected with the control end of the switch circuit, the output of the control circuit is connected with the control end of the switch circuit and the output of the current surge suppression circuit, and the input of the control circuit is connected with a control signal. The invention is used for electronic equipment, and when the rear-end equipment is electrified and works, the unstable phenomena of overcurrent restart and the like of the front-end power supply equipment can be avoided, and the rear-end equipment can be protected from damaging the electric equipment due to surge current impact; the current surge suppression circuit has the advantages of fewer required devices, very simple circuit structure, low economic cost and high cost performance.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a switch control circuit, and particularly relates to a switch control circuit with current surge suppression.
Background
In the application of the electronic equipment circuit, the on-off of the current in the control circuit can better control the circuit, reduce unnecessary electric energy loss and device loss and better protect the voltage and current impact on the electronic equipment on the premise of not starting.
However, the electronic device has a surge current much larger than the steady-state operating current at the moment of starting, and the surge current has great damage to the power supply equipment and the electric equipment, so that the power supply equipment and the electric equipment can be seriously damaged.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention provides a switch control circuit, aiming at the problems in the related art, which can reduce the impact current at the moment of starting electronic equipment to a bearable current value and can better control the on-off of the electronic equipment through a controllable switch.
The technical scheme of the invention is realized as follows:
a switch control circuit comprises a switch circuit, a current surge suppression circuit and a control circuit, wherein the input of the switch circuit is connected with a direct current input, the output of the switch circuit is connected with a direct current output, the input of the current surge suppression circuit is connected with the direct current input, the output of the current surge suppression circuit is connected with the control end of the switch circuit, the output of the control circuit is connected with the control end of the switch circuit and the output of the current surge suppression circuit, and the input of the control circuit is connected with a control signal.
The switching circuit comprises a P-channel field effect transistor V1 connected among the direct current input, the direct current output and the current surge suppression circuit output, a source electrode of the P-channel field effect transistor is connected with the direct current input, a drain electrode of the P-channel field effect transistor is connected with the direct current output, and a grid electrode of the P-channel field effect transistor is connected with the output of the current surge suppression circuit and the output of the control circuit.
The current surge suppression circuit comprises a diode D1 and a capacitor C1, wherein the diode D1 is connected with the anode of the capacitor C1, and the diode D1 and the capacitor C1 are connected in series between the direct current input and the control end of the switch circuit.
In addition, the current surge suppression circuit further comprises a series voltage division circuit connected among the direct current input, the control end of the switch circuit and the output end of the control circuit.
Wherein, series voltage divider circuit includes resistance R1, resistance R2 and resistance R3, wherein, resistance R1 connect in direct current input with between the negative pole of electric capacity C1, resistance R2 connects between the positive pole and the negative pole of electric capacity C1, just resistance R1 with resistance R2 forms parallelly connected, resistance R3's one end is connected with control circuit's output, resistance R3's the other end with parallelly connected back resistance R1 with resistance R2 connects.
The control circuit comprises a resistor R4, a resistor R5 and a triode V2, wherein one end of the resistor R4 is connected with a control signal, and the other end of the resistor R4 is connected with a base electrode of the triode V2; one end of the resistor R5 is connected with the direct current input, the other end of the resistor R5 is connected with the base electrode of the triode V2, and the collector electrode and the emitter electrode of the triode V2 are respectively connected with the resistor R3 and the direct current input.
Has the beneficial effects that:
(1) The invention is used for electronic equipment, and when the rear-end equipment is electrified and works, the unstable phenomena of overcurrent restart and the like of the front-end power supply equipment can be avoided, and the rear-end equipment can be protected from damaging the electric equipment due to surge current impact;
(2) The current surge suppression circuit has the advantages of less required devices, very simple circuit structure, low economic cost and high cost performance because the required devices are common diodes, resistors and capacitors.
(3) The invention can adjust the current suppression value, and can adjust the current suppression value only by selecting resistors or capacitors with different parameters according to the working conditions of the electronic equipment.
(4) The on-resistance of the controllable switch type circuit adopted by the invention is only a few milliohms, the voltage drop is negligible, and the field effect transistors with different parameters can meet various direct current circuits without being limited by the input voltage and the current.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a switch control circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a switch control circuit according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of saber simulation software simulation according to an embodiment of the present invention;
fig. 4 Is a simulation graph of the current Is at the input end of the fet V1 when no current surge suppression processing Is performed according to the embodiment of the present invention;
fig. 5 Is a simulation diagram of the current at the input Is of the fet V1 when current surge processing Is performed according to the embodiment of the present invention.
In the figure:
1. a switching circuit; 2. a current surge suppression circuit; 3. a control circuit.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
According to an embodiment of the present invention, there is provided a switch control circuit.
As shown in fig. 1, a switching control circuit according to an embodiment of the present invention includes a switching circuit 1, a current surge suppressing circuit 2, and a control circuit 3, wherein an input of the switching circuit 1 is connected to a dc input vin, an output of the switching circuit 1 is connected to a dc output vout, an input of the current surge suppressing circuit 2 is connected to the dc input vin, an output of the current surge suppressing circuit 2 is connected to a control terminal of the switching circuit 3, an output of the control circuit 3 is connected to the control terminal of the switching circuit 1 and the output of the current surge suppressing circuit 2, and an input of the control circuit 3 is connected to a control signal.
In one embodiment, the switch circuit 1 includes a P-channel field effect transistor V1 connected between the dc input vin, the dc output vout, and the output of the current surge suppression circuit 2, and a source of the P-channel field effect transistor V1 is connected to the dc input vin, and a drain of the P-channel field effect transistor V1 is connected to the dc output vout, so as to turn on or off a dc circuit; and the grid electrode based on the P-channel field effect transistor V1 is connected with the output of the current surge suppression circuit 2 and the output of the control circuit 3, so that the on-off control of the direct current circuit is realized.
In use, when the output of the control circuit 3 is low, the on state of the switching circuit is realized, and when the output of the control circuit 3 is high, the off state of the switching circuit is realized.
In one embodiment, the current surge suppressing circuit 2 includes a diode D1 and a capacitor C1, wherein the diode D1 is connected to the anode of the capacitor C1, and the diode D1 and the capacitor C1 are connected in series between the dc input vin and the control terminal of the switch circuit 1. The current surge suppression circuit 2 further includes a series voltage divider circuit connected between the dc input vin, the control terminal of the switch circuit 1, and the output terminal of the control circuit 3. The series voltage dividing circuit comprises a resistor R1, a resistor R2 and a resistor R3, wherein the resistor R1 is connected between the direct current input vin and the negative electrode of the capacitor C1, the resistor R2 is connected between the positive electrode and the negative electrode of the capacitor C1, the resistor R1 and the resistor R2 are connected in parallel, one end of the resistor R3 is connected with the output end of the control circuit 3, and the other end of the resistor R3 is connected with the resistor R1 and the resistor R2 after being connected in parallel.
When the control circuit is used, when the control signal is at a high level, the triode V2 of the control circuit 3 is completely conducted, at the moment, the input voltage charges the capacitor C1 through the diode D1, the VGS voltage difference of the field effect tube V1 in the switch circuit 1 is slowly increased along with the increase of the capacitor C1 capacitor charging voltage, the field effect tube V1 is slowly changed from non-conduction to incomplete conduction and then to complete conduction, and therefore the surge current in a channel is restrained. The resistor R1 and the resistor R2 form a parallel connection relation, and form a series voltage division circuit with the resistor R3, and the grid source voltage of the field effect transistor is the voltage difference between two ends of the resistor R1. When the control signal is at a low level, because one end of the resistor R3 is suspended and the diode D1 is in one-way conduction, the electric quantity stored in the capacitor C1 is discharged through the resistor R2, the voltage difference between two ends of the resistor R1 is 0V, the field-effect tube V1 is rapidly pulled to the power voltage, the field-effect tube is cut off and rapidly cut off, and the field-effect tube is prevented from being damaged in the opening process.
In one embodiment, the control circuit 3 includes a resistor R4, a resistor R5, and a transistor V2, wherein one end of the resistor R4 is connected to a control signal, and the other end of the resistor R4 is connected to a base of the transistor V2; one end of the resistor R5 is connected with a direct current input vin-, the other end of the resistor R5 is connected with a base electrode of the triode V2, and a collector and an emitter of the triode V2 are respectively connected with the resistor R3 and the direct current input vin-. When the control signal is at a high level, the collector and the emitter of the triode V2 are in saturated conduction, and the collector of the triode is pulled down to the ground; when the control signal is at a low level, the triode V2 is in a cut-off state, and the collector of the triode is in a suspended state.
When the control switch is applied to electronic equipment, firstly, the positive pole of the current surge suppression circuit 2 is connected in series with the direct current input positive pole of the electronic equipment, the negative pole of the current surge suppression circuit 2 is connected with the negative pole of the electronic equipment, and when the control switch controls the field effect transistor to be in a conducting state, the electronic equipment can normally work. When the control switch field effect transistor is in a disconnected state, the electronic equipment stops working.
For the current surge suppression circuit, the example is as follows:
the method comprises the following steps: when the electronic equipment normally works: the direct current input voltage range is 11V-16.8V, the output capacitive load is 2200uF, and the input current is inhibited from exceeding 6A.
The parameters of the current surge suppression circuit are designed according to the requirements as shown in the following table.
| Device bit number | Description of devices | Device value |
| R1 | Resistance (RC) | 200k |
| R2 | |
200k |
| R3 | Resistance (RC) | 100k |
| R4 | Resistance (RC) | 10k |
| R5 | Resistance (RC) | 20k |
| Rload | Electric resistance | 24Ω |
| C1 | Capacitor with improved capacitance | 1uF |
| C2 | Capacitor with improved capacitance | 2200uF |
| V1 | P-channel MOS tube | FDD9507L |
| V2 | Triode | MMBT2222 |
| D1 | Diode with a high-voltage source | LL4148 |
According to the parameters of the components in the table, a saber simulation software is used to simulate a circuit shown in fig. 3, wherein a square wave signal with an amplitude of 3.3V is used as a control signal, and an input voltage is 15V: the simulation graph of the current Is at the input end of the field effect tube V1 when the current surge suppression processing Is not carried out Is shown in FIG. 4: fig. 5 shows a simulation graph of the current at the input Is of the fet V1 when the current surge processing Is performed.
And (4) simulation conclusion: when the current surge suppression processing Is not carried out, the surge current Is at the input end of the MOS tube reaches up to 20A, so that uncertainty exists in both power supply equipment and electric equipment, even unstable phenomena such as restarting of the power supply equipment and the like due to overhigh instant output current, or certain devices at the input end of the electric equipment are damaged; after the current surge treatment, the current of the input end IS of the MOS tube Is limited below 3A, and the power supply equipment and the electric equipment are both in a safety range.
And (3) actual circuit testing: the output voltage of the power supply equipment is 15V, and the maximum power consumption of the power supply equipment is 10W.
When the current surge suppression processing is not carried out, the surge current of the input end of the used equipment at the starting-up moment reaches 37A (current clamp: 1A/10 mV). After the current surge suppression treatment is carried out, the surge current of the input end of the using equipment at the starting-up moment is lower than 5A (current clamp: 1A/10 mV).
In summary, by means of the above technical scheme of the present invention, a switching control circuit based on current surge suppression is realized, fewer devices are required for realizing the current surge suppression circuit, the circuit configuration is very simple, the required devices are common resistors, capacitors, field effect transistors, and the like, the economic cost is low, and the cost performance is high. The circuit can adjust the suppression current value, the on-resistance is only a few milliohms, the voltage drop is almost ignored, and various direct current working electronic equipment can be met by selecting resistors, capacitors and field effect transistors with different parameters according to the working requirements of the electronic equipment without being limited by the input voltage and the current.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A switching control circuit comprising a switching circuit, a current surge suppression circuit and a control circuit, wherein the input of the switching circuit is connected to a DC input, the output of the switching circuit is connected to a DC output, the input of the current surge suppression circuit is connected to a DC input, the output of the current surge suppression circuit is connected to the control terminal of the switching circuit, the output of the control circuit is connected to the control terminal of the switching circuit and the output of the current surge suppression circuit, and the input of the control circuit is connected to a control signal.
2. The switch-control circuit of claim 1, wherein the switch circuit comprises a P-channel fet V1 connected between the dc input, the dc output, and the current surge suppression circuit output, and wherein the source of the P-channel fet is connected to the dc input, the drain of the P-channel fet is connected to the dc output, and the gate of the P-channel fet is connected to the output of the current surge suppression circuit and the output of the control circuit.
3. The switch control circuit according to claim 2, wherein the current surge suppressing circuit comprises a diode D1 and a capacitor C1, wherein the diode D1 is connected to an anode of the capacitor C1, and the diode D1 and the capacitor C1 are connected in series between the dc input and the control terminal of the switch circuit.
4. The switch control circuit of claim 3, wherein the current surge suppression circuit further comprises a series voltage divider circuit connected between the DC input, the control terminal of the switch circuit, and the output terminal of the control circuit.
5. The switch control circuit according to claim 4, wherein the series voltage divider circuit comprises a resistor R1, a resistor R2 and a resistor R3, wherein the resistor R1 is connected between the dc input and the negative electrode of the capacitor C1, the resistor R2 is connected between the positive electrode and the negative electrode of the capacitor C1, the resistor R1 and the resistor R2 are connected in parallel, one end of the resistor R3 is connected to the output end of the control circuit, and the other end of the resistor R3 is connected to the resistor R1 and the resistor R2 after being connected in parallel.
6. The switch control circuit according to claim 5, wherein the control circuit comprises a resistor R4, a resistor R5 and a transistor V2, wherein one end of the resistor R4 is connected to a control signal, and the other end of the resistor R4 is connected to a base of the transistor V2; one end of the resistor R5 is connected with the direct current input, the other end of the resistor R5 is connected with the base electrode of the triode V2, and the collector electrode and the emitter electrode of the triode V2 are respectively connected with the resistor R3 and the direct current input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210939864.4A CN115276625A (en) | 2022-08-05 | 2022-08-05 | Switch control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210939864.4A CN115276625A (en) | 2022-08-05 | 2022-08-05 | Switch control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN115276625A true CN115276625A (en) | 2022-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210939864.4A Pending CN115276625A (en) | 2022-08-05 | 2022-08-05 | Switch control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN115276625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI860817B (en) * | 2023-08-18 | 2024-11-01 | 台達電子工業股份有限公司 | Switch trigger for suppressing inrush current |
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2022
- 2022-08-05 CN CN202210939864.4A patent/CN115276625A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI860817B (en) * | 2023-08-18 | 2024-11-01 | 台達電子工業股份有限公司 | Switch trigger for suppressing inrush current |
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