CN210297668U - Analog switch circuit - Google Patents
Analog switch circuit Download PDFInfo
- Publication number
- CN210297668U CN210297668U CN201921687979.9U CN201921687979U CN210297668U CN 210297668 U CN210297668 U CN 210297668U CN 201921687979 U CN201921687979 U CN 201921687979U CN 210297668 U CN210297668 U CN 210297668U
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- resistor
- circuit
- integrated circuit
- grounded
- operational amplifier
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Abstract
The utility model discloses an analog switch circuit, which comprises an integrated circuit, an MOS tube, an overcurrent protection circuit and a temperature protection circuit, wherein the integrated circuit controls the MOS tube switch through the overcurrent protection circuit, and the temperature protection circuit controls the integrated circuit switch; the model of integrated circuit is SG3525, and the external 5V direct current voltage power supply of integrated circuit's fifteenth end, among this analog switch circuit, temperature protection circuit can carry out the excess temperature protection to the MOS pipe, can play overcurrent protection to the MOS pipe through overcurrent protection circuit simultaneously, and then has improved analog switch circuit's reliability, the utility model relates to a rationally, be fit for using widely.
Description
Technical Field
The utility model relates to the technical field of circuits, concretely relates to analog switch circuit.
Background
In some application scenarios, there is a high requirement on the turn-on time of the analog switch, and the analog switch is required to be turned on quickly.
According to the reference patent CN201821718259, an analog switch circuit is often used in a scene requiring signal on/off and path selection, and when the analog switch circuit is used in a control circuit of a fast switch, the analog switch can cause overheating of switch components due to high-speed switching of the analog switch, and although a heat sink is added, the requirement of high-speed heat dissipation cannot be met, and the analog switch circuits lack a function of monitoring the switch components, which causes the analog switch circuit to be burned out when the high-speed switch operates, and in addition, the switch components are broken down due to inrush current of switch current when the switch circuit operates, which causes failure of the switch circuit.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome foretell not enough, provide an analog switch circuit.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
an analog switch circuit comprises an integrated circuit, an MOS tube, an overcurrent protection circuit and a temperature protection circuit, wherein the integrated circuit controls the switch of the MOS tube through the overcurrent protection circuit, and the temperature protection circuit controls the switch of the integrated circuit;
the model of the integrated circuit is SG3525, the fifteenth end of the integrated circuit is externally connected with a 5V direct-current voltage power supply, the tenth end of the integrated circuit is grounded, the eleventh end of the integrated circuit is electrically connected with the grid electrode of the MOS tube through an overcurrent protection circuit, the first end of the integrated circuit is grounded through an eleventh resistor, and the second end of the integrated circuit is grounded through a tenth resistor;
the over-current protection circuit comprises a first resistor, and the eleventh end of the integrated circuit is electrically connected with the grid electrode of the MOS tube through the first resistor;
the source electrode of the MOS tube is externally connected with a 5V direct-current voltage power supply;
the temperature protection circuit comprises a PT100, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the power supply circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and an operational amplifier, one end of a series circuit formed by a PT100 resistor and a second resistor is grounded, the other end of the series circuit formed by the PT100 resistor and the second resistor is externally connected with a 5V direct-current voltage power supply, one end of the series circuit formed by the third resistor and the fourth resistor is grounded, the other end of the series circuit formed by the third resistor and the fourth resistor is externally connected with a 5V direct-current voltage power supply, the in-phase input end of the operational amplifier is respectively and electrically connected with the third resistor and the fourth resistor through the sixth resistor, the in-phase input end of the operational amplifier is grounded through the ninth resistor, the anti-phase input end of the operational amplifier is respectively and electrically connected with the second resistor and the PT100 through a fifth resistor, the anti-phase input end of the operational amplifier is electrically connected with the output end of the operational amplifier through the seventh resistor.
Preferably, the fifth terminal of the integrated circuit is grounded through a capacitor.
Preferably, the sixth terminal of the integrated circuit is grounded through a twelfth resistor.
Preferably, the first terminal of the integrated circuit is grounded through a tenth resistor, and the second terminal of the integrated circuit is grounded through an eleventh resistor.
In the circuit, an oscillation generator externally connected with the integrated circuit consists of a third end, a fourth end, a fifth end, a sixth end and a seventh end of the integrated circuit, and the fourth end of the integrated circuit can see oscillation output waveforms. The fifth end and the sixth end of the integrated circuit are externally connected with a resistor (a ninth resistor) and a capacitor, and the resistance value and the capacity of the resistor determine the oscillation frequency of the oscillator.
And then, the eleventh end of the integrated circuit outputs a PWM control signal to control the switch of the MOS tube, the current can be limited by the first resistor, the output signal of the eleventh end of the integrated circuit is 5V/1A, and the resistance value of the first resistor is set according to the maximum breakdown current of the MOS tube.
Simultaneously, PT100 is the contact type sensor, so PT100 pastes on the fin of MOS pipe, and PT100 periphery can overlap and establish insulating adhesive tape and fin and carry out electrical isolation, PT100 can carry out real-time detection to the temperature on the fin, PT100 can produce the resistance change because of temperature variation afterwards, because PT100, the second resistance, the third resistance, the H bridge has been constituteed to the fourth resistance, amplify the temperature deviation signal that produces by the signal amplification circuit who mainly constitutes with fortune again, rise gradually when the fin temperature, the signal deviation will grow, the output signal voltage value that fortune was put at this moment will trigger integrated circuit and close, make the MOS pipe close, temperature protection has been played.
The utility model has the advantages that: in the analog switch circuit, the temperature protection circuit can perform over-temperature protection on the MOS tube, and meanwhile, the over-current protection circuit can perform over-current protection on the MOS tube, so that the reliability of the analog switch circuit is improved.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic circuit diagram of the present invention.
In the figure: u1. integrated circuit, U2. operational amplifier, Q1 MOS transistor, C1 capacitor, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, R5. fifth resistor, R6. sixth resistor, R7. seventh resistor, R8. eighth resistor, R9. ninth resistor, R10 tenth resistor, R11 eleventh resistor, and R12 twelfth resistor.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, an analog switch circuit includes an integrated circuit U1, a MOS transistor Q1, an overcurrent protection circuit, and a temperature protection circuit, where the integrated circuit U1 controls the MOS transistor Q1 to switch through the overcurrent protection circuit, and the temperature protection circuit controls the integrated circuit U1 to switch;
the model of the integrated circuit U1 is SG 1, the fifteenth end of the integrated circuit U1 is externally connected with a 5V direct-current voltage power supply, the twelfth end of the integrated circuit U1 is grounded, the eleventh end of the integrated circuit U1 is electrically connected with the grid of the MOS transistor Q1 through an overcurrent protection circuit, the first end of the integrated circuit U1 is grounded through an eleventh resistor, and the second end of the integrated circuit U1 is grounded through a tenth resistor;
the overcurrent protection circuit comprises a first resistor R1, and the eleventh end of the integrated circuit U1 is electrically connected with the gate of the MOS transistor Q1 through the first resistor R1;
the source electrode of the MOS tube Q1 is externally connected with a 5V direct-current voltage power supply;
the temperature protection circuit comprises a PT100, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and an operational amplifier U2, one end of a series circuit formed by the PT100 and the second resistor R2 is grounded, the other end of the series circuit formed by the PT100 and the second resistor R2 is externally connected with a 5V direct-current voltage power supply, one end of a series circuit formed by the third resistor R3 and the fourth resistor R4 is grounded, the other end of the series circuit formed by the third resistor R3 and the fourth resistor R4 is externally connected with a 5V direct-current voltage power supply, the non-inverting input end of the operational amplifier U2 is respectively and electrically connected with the third resistor R3 and the fourth resistor R4 through the sixth resistor R6, the non-inverting input end of the operational amplifier U4 is respectively and electrically connected with the inverting input end of the second resistor R4 and the inverting input end of the operational amplifier U4 through the inverse resistor R4, the output terminal of the operational amplifier U2 is electrically connected to the eighth terminal of the integrated circuit U1 through an eighth resistor R8.
In this example: the fifth terminal of the integrated circuit U1 is connected to ground through a capacitor C1.
In this example: the sixth terminal of the integrated circuit U1 is connected to ground through a twelfth resistor R12.
In this example: the first end of the integrated circuit U1 is grounded through a tenth resistor R10, and the second end of the integrated circuit U1 is grounded through an eleventh resistor R11.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. An analog switching circuit, characterized by: the integrated circuit controls the switch of the MOS tube through the overcurrent protection circuit, and the temperature protection circuit controls the switch of the integrated circuit;
the model of the integrated circuit is SG3525, the fifteenth end of the integrated circuit is externally connected with a 5V direct-current voltage power supply, the tenth end of the integrated circuit is grounded, the eleventh end of the integrated circuit is electrically connected with the grid electrode of the MOS tube through an overcurrent protection circuit, the first end of the integrated circuit is grounded through an eleventh resistor, and the second end of the integrated circuit is grounded through a tenth resistor;
the over-current protection circuit comprises a first resistor, and the eleventh end of the integrated circuit is electrically connected with the grid electrode of the MOS tube through the first resistor;
the source electrode of the MOS tube is externally connected with a 5V direct-current voltage power supply;
the temperature protection circuit comprises a PT100, a second resistor, a third resistor, a fourth resistor and a fifth resistor, the power supply circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and an operational amplifier, one end of a series circuit formed by a PT100 resistor and a second resistor is grounded, the other end of the series circuit formed by the PT100 resistor and the second resistor is externally connected with a 5V direct-current voltage power supply, one end of the series circuit formed by the third resistor and the fourth resistor is grounded, the other end of the series circuit formed by the third resistor and the fourth resistor is externally connected with a 5V direct-current voltage power supply, the in-phase input end of the operational amplifier is respectively and electrically connected with the third resistor and the fourth resistor through the sixth resistor, the in-phase input end of the operational amplifier is grounded through the ninth resistor, the anti-phase input end of the operational amplifier is respectively and electrically connected with the second resistor and the PT100 through a fifth resistor, the anti-phase input end of the operational amplifier is electrically connected with the output end of the operational amplifier through the seventh resistor.
2. The analog switching circuit of claim 1, wherein: the fifth terminal of the integrated circuit is grounded through a capacitor.
3. The analog switching circuit of claim 1, wherein: and the sixth end of the integrated circuit is grounded through a twelfth resistor.
4. The analog switching circuit of claim 1, wherein: the first end of the integrated circuit is grounded through a tenth resistor, and the second end of the integrated circuit is grounded through an eleventh resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921687979.9U CN210297668U (en) | 2019-10-10 | 2019-10-10 | Analog switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921687979.9U CN210297668U (en) | 2019-10-10 | 2019-10-10 | Analog switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210297668U true CN210297668U (en) | 2020-04-10 |
Family
ID=70066415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921687979.9U Expired - Fee Related CN210297668U (en) | 2019-10-10 | 2019-10-10 | Analog switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210297668U (en) |
-
2019
- 2019-10-10 CN CN201921687979.9U patent/CN210297668U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200410 Termination date: 20201010 |