CN213661578U - Negative voltage protection circuit - Google Patents
Negative voltage protection circuit Download PDFInfo
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- CN213661578U CN213661578U CN202022020493.9U CN202022020493U CN213661578U CN 213661578 U CN213661578 U CN 213661578U CN 202022020493 U CN202022020493 U CN 202022020493U CN 213661578 U CN213661578 U CN 213661578U
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Abstract
The utility model is suitable for an application technology field of microwave radio frequency device provides a negative pressure protection circuit. This negative pressure protection circuit includes: a digital integrated unit, a first transistor and a second transistor; the input of digital integrated unit connects the power negative voltage, the base of first transistor is connected to the output of digital integrated unit, the emitter ground of first transistor, the grid of second transistor is connected to the collector of first transistor, the drain electrode of second transistor connects the power positive voltage, the source electrode of second transistor is voltage output end, thereby can convert the power negative voltage of input into the first transistor of high level input through digital integrated unit, first transistor switches on, output positive electricity gives the second transistor, the second transistor switches on, output positive voltage supplies power amplifier, thereby realize the negative pressure protection to power amplifier, and the circuit is simple, the components and parts quantity is less, make circuit operational reliability higher.
Description
Technical Field
The utility model belongs to the technical field of the application of microwave radio frequency device, especially, relate to a negative pressure protection circuit.
Background
With the development of mobile communication technology, the application of microwave radio frequency technology is also more and more extensive. Modules required in hardware engineering often need power amplification, and when the power amplifier requires power-on, grid voltage is firstly added, and then leakage voltage is added; when the power is removed, the leakage voltage is reduced firstly, then the grid voltage is reduced, otherwise the device is easy to damage, and the working stability of the solid-state power amplifier is ensured.
Therefore, it is necessary to provide a negative voltage protection circuit with a simple structure and capable of improving the reliability of the circuit to solve the above-mentioned drawbacks.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a negative voltage protection circuit is provided to solve among the prior art negative voltage protection circuit structure complicacy, the components and parts input is on a large side, the lower problem of circuit operational reliability.
The embodiment of the utility model provides a first aspect provides a negative pressure protection circuit, include: a digital integrated unit, a first transistor and a second transistor;
the input end of the digital integration unit is connected with a power supply negative voltage, the output end of the digital integration unit is connected with the base electrode of the first transistor, the emitter electrode of the first transistor is grounded, the collector electrode of the first transistor is connected with the grid electrode of the second transistor, the drain electrode of the second transistor is connected with a power supply positive voltage, and the source electrode of the second transistor is a voltage output end.
Optionally, the digital integration unit includes: a voltage stabilizing diode Dz and a NOT circuit;
the negative electrode of the voltage stabilizing diode Dz is connected with a negative voltage of a power supply, the positive electrode of the voltage stabilizing diode Dz is connected with the input end of the NOT gate circuit, the analog signal ground end of the NOT gate circuit is grounded, the analog signal power supply end of the NOT gate circuit is connected with the power supply with preset voltage, and the output end of the NOT gate circuit is connected with the base electrode of the first transistor.
Optionally, the digital integrated unit further includes: a resistor R1 and a resistor R2;
one end of the resistor R1 and one end of the resistor R2 are connected between the zener diode Dz and the input terminal of the not gate circuit, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to the power supply of the preset voltage.
Optionally, the digital integrated unit further includes: a capacitance C1;
the positive end of the capacitor C1 is connected between the analog signal power supply end of the NOT gate circuit and the power supply with the preset voltage, and the negative end of the capacitor C1 is grounded.
Optionally, the negative voltage protection circuit further includes: a resistor R3;
one end of the resistor R3 is connected with the output end of the digital integrated unit, and the other end of the resistor R3 is connected with the base of the first transistor.
Optionally, the negative voltage protection circuit further includes: a resistor R4;
one end of the resistor R4 is connected to the collector of the first transistor, and the other end of the resistor R4 is connected to the gate of the second transistor.
Optionally, the negative voltage protection circuit further includes: a capacitance C2;
the positive terminal of the capacitor C2 is connected between the drain of the second transistor and the positive power supply voltage, and the negative terminal of the capacitor C2 is grounded.
Optionally, the negative voltage protection circuit further includes: a capacitance C3;
the positive end of the capacitor C3 is connected between one end of the resistor R4 and the voltage output end, and the negative end of the capacitor C3 is grounded.
Optionally, the first transistor is an NPN transistor.
Optionally, the second transistor is a field effect transistor.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: the embodiment of the utility model provides a, can convert the power negative voltage of input into the first transistor of high level input through the digital integrated unit, then first transistor switches on, and the second transistor is given to the positive electricity of output, and the second transistor switches on, and power amplifier is supplied with to the positive voltage of output. When the negative voltage of the power supply is not input, the low level is output after passing through the digital integration unit, so that the first transistor cannot be conducted, the second transistor is turned off, and the output end has no positive voltage at the moment. The embodiment can realize negative voltage protection of the power amplifier, and has the advantages of simple circuit, less component number and higher working reliability of the circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and 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 to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a negative voltage protection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a negative voltage protection circuit according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Example one
Fig. 1 is a schematic diagram of a negative voltage protection circuit according to the present invention, which is detailed as follows.
The negative voltage protection circuit may include: a digital integrated unit 1, a first transistor Q1, and a second transistor Q2;
the input end of the digital integrated unit 1 is connected with a power supply negative voltage, the output end of the digital integrated unit 1 is connected with the base electrode of the first transistor Q1, the emitter electrode of the first transistor Q1 is grounded, the collector electrode of the first transistor Q1 is connected with the grid electrode of the second transistor Q2, the drain electrode of the second transistor Q2 is connected with a power supply positive voltage, and the source electrode of the second transistor Q2 is a voltage output end.
In the negative voltage protection circuit, the digital integrated unit 1 may convert an input power negative voltage into a high level, input the high level to the first transistor, then the first transistor is turned on, output a positive voltage to the second transistor, the second transistor is turned on, and output a positive voltage to the power amplifier. When the negative voltage of the power supply is not input, the low level is output after passing through the digital integration unit 1, so that the first transistor cannot be conducted, the second transistor is turned off, and at the moment, the output end has no positive voltage. The embodiment can realize negative voltage protection of the power amplifier, and has the advantages of simple circuit, less component number and higher working reliability of the circuit.
Alternatively, as shown in fig. 2, the digital integrated unit 1 may include: a voltage stabilizing diode Dz and a NOT circuit;
the negative electrode of the voltage stabilizing diode Dz is connected with a negative voltage of a power supply, the anode of the voltage stabilizing diode Dz is connected with the input end (A pin) of the NOT gate circuit, the analog signal ground end of the NOT gate circuit is grounded, the analog signal power end of the NOT gate circuit is connected with the power supply with preset voltage, and the output end (Y pin) of the NOT gate circuit is connected with the base electrode of the first transistor.
After negative voltage is input, the zero level is output after the negative voltage passes through the voltage stabilizing diode Dz, and the zero level is output as a high level through the NOT circuit. Alternatively, the power supply of the preset voltage may be a power supply of 3.3V.
Optionally, as shown in fig. 2, the digital integrated unit 1 further includes: a resistor R1 and a resistor R2;
one end of the resistor R1 and one end of the resistor R2 are connected between the zener diode Dz and the input terminal of the not gate circuit, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to the power supply of the preset voltage. Alternatively, the power supply of the preset voltage may be a power supply of 3.3V.
In this embodiment, the resistor R1 and the resistor R2 are voltage dividing resistors, and the resistance of the resistor R1 is much larger than the resistance of the resistor R2. When a negative voltage is input, a zero voltage is output after passing through the zener diode Dz, so that a voltage between the resistor R1 and the resistor R2 is about 3.3V, which is a high level.
Optionally, as shown in fig. 2, the digital integrated unit 1 further includes: a capacitance C1;
the positive end of the capacitor C1 is connected between the analog signal power supply end of the NOT gate circuit and the power supply with the preset voltage, and the negative end of the capacitor C1 is grounded.
In the present embodiment, the capacitor C1 is a filter capacitor for filtering noise in the power signal.
Alternatively, the capacitor C1 may be formed by two parallel capacitors, that is, the positive terminals of the two parallel capacitors are connected between the analog signal power supply terminal of the not circuit and the power supply of the preset voltage, and the negative terminals of the two parallel capacitors are grounded.
Optionally, as shown in fig. 2, the negative voltage protection circuit further includes: a resistor R3;
one end of the resistor R3 is connected with the output end of the digital integrated unit, and the other end of the resistor R3 is connected with the base of the first transistor.
In this embodiment, the resistor R3 may play an isolation role in the negative voltage protection circuit to prevent the first transistor from being burned down when the voltage output from the output terminal of the digital integrated unit is directly input into the first transistor.
Optionally, as shown in fig. 2, the negative voltage protection circuit further includes: a resistor R4;
one end of the resistor R4 is connected to the collector of the first transistor, and the other end of the resistor R4 is connected to the gate of the second transistor.
In the embodiment, the resistor R4 is a pull-up resistor, and the resistance may be 10 kohm.
Optionally, as shown in fig. 2, the negative voltage protection circuit further includes: a capacitance C2;
the positive terminal of the capacitor C2 is connected between the drain of the second transistor and the positive power supply voltage, and the negative terminal of the capacitor C2 is grounded.
In the present embodiment, the capacitor C2 is a filter capacitor.
Alternatively, the capacitor C2 may be formed by three parallel capacitors, that is, the positive terminals of the three parallel capacitors are connected between the drain of the second transistor and the positive voltage of the power supply, and the negative terminals of the three parallel capacitors are grounded.
Optionally, as shown in fig. 2, the negative voltage protection circuit further includes: a capacitance C3;
the positive end of the capacitor C3 is connected between one end of the resistor R4 and the voltage output end, and the negative end of the capacitor C3 is grounded.
In the present embodiment, the capacitor C3 is a filter capacitor.
Alternatively, the capacitor C3 may be formed by three parallel capacitors, that is, the positive terminals of the three parallel capacitors are connected between one terminal of the resistor R4 and the voltage output terminal, and the negative terminals of the three parallel capacitors are grounded.
Optionally, the first transistor is an NPN transistor.
Optionally, the second transistor is a field effect transistor.
Above-mentioned negative voltage protection circuit, after the input of power negative voltage, be zero level behind zener diode Dz, become the high level through the NOT gate circuit again, the first transistor is connected to the output of NOT gate circuit for first transistor switches on, and first transistor output positive electricity is for the second transistor, and the input of second transistor can switch on when having positive electricity, and output positive voltage accessible supplies with the power amplifier who connects. On the contrary, if no power supply negative voltage is input, the high level is obtained after passing through the voltage stabilizing diode Dz, the high level is output as the low level after passing through the not gate circuit, at the moment, the first transistor cannot be conducted, so that the second transistor is turned off, the V + cannot pass through, and the output end has no V + -IN, so that the negative voltage protection circuit provided by the embodiment realizes the negative voltage protection function, namely, when negative voltage exists, positive voltage exists; and when no negative electricity exists, no positive electricity exists. The negative voltage protection circuit provided by the embodiment has the advantages of simple circuit connection, less element number and higher working reliability.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A negative voltage protection circuit, comprising: a digital integrated unit, a first transistor and a second transistor;
the input end of the digital integration unit is connected with a power supply negative voltage, the output end of the digital integration unit is connected with the base electrode of the first transistor, the emitter electrode of the first transistor is grounded, the collector electrode of the first transistor is connected with the grid electrode of the second transistor, the drain electrode of the second transistor is connected with a power supply positive voltage, and the source electrode of the second transistor is a voltage output end.
2. The negative voltage protection circuit of claim 1, wherein the digital integrated unit comprises: a voltage stabilizing diode Dz and a NOT circuit;
the negative electrode of the voltage stabilizing diode Dz is connected with a negative voltage of a power supply, the positive electrode of the voltage stabilizing diode Dz is connected with the input end of the NOT gate circuit, the analog signal ground end of the NOT gate circuit is grounded, the analog signal power supply end of the NOT gate circuit is connected with the power supply with preset voltage, and the output end of the NOT gate circuit is connected with the base electrode of the first transistor.
3. The negative voltage protection circuit of claim 2, wherein the digital integrated unit further comprises: a resistor R1 and a resistor R2;
one end of the resistor R1 and one end of the resistor R2 are connected between the zener diode Dz and the input terminal of the not gate circuit, the other end of the resistor R1 is grounded, and the other end of the resistor R2 is connected to the power supply of the preset voltage.
4. The negative voltage protection circuit of claim 2, wherein the digital integrated unit further comprises: a capacitance C1;
the positive end of the capacitor C1 is connected between the analog signal power supply end of the NOT gate circuit and the power supply with the preset voltage, and the negative end of the capacitor C1 is grounded.
5. The negative voltage protection circuit of any of claims 1-4, further comprising: a resistor R3;
one end of the resistor R3 is connected with the output end of the digital integrated unit, and the other end of the resistor R3 is connected with the base of the first transistor.
6. The negative voltage protection circuit of any of claims 1-4, further comprising: a resistor R4;
one end of the resistor R4 is connected to the collector of the first transistor, and the other end of the resistor R4 is connected to the gate of the second transistor.
7. The negative voltage protection circuit of any of claims 1-4, further comprising: a capacitance C2;
the positive terminal of the capacitor C2 is connected between the drain of the second transistor and the positive power supply voltage, and the negative terminal of the capacitor C2 is grounded.
8. The negative voltage protection circuit of claim 6, further comprising: a capacitance C3;
the positive end of the capacitor C3 is connected between one end of the resistor R4 and the voltage output end, and the negative end of the capacitor C3 is grounded.
9. The negative voltage protection circuit of any one of claims 1-4, wherein the first transistor is an NPN transistor.
10. The negative voltage protection circuit of any of claims 1-4, wherein the second transistor is a field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022020493.9U CN213661578U (en) | 2020-09-15 | 2020-09-15 | Negative voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022020493.9U CN213661578U (en) | 2020-09-15 | 2020-09-15 | Negative voltage protection circuit |
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| CN213661578U true CN213661578U (en) | 2021-07-09 |
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| CN202022020493.9U Active CN213661578U (en) | 2020-09-15 | 2020-09-15 | Negative voltage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839625A (en) * | 2021-09-29 | 2021-12-24 | 中国电子科技集团公司第三十八研究所 | High-power amplifier power supply modulation circuit with negative pressure protection |
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2020
- 2020-09-15 CN CN202022020493.9U patent/CN213661578U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839625A (en) * | 2021-09-29 | 2021-12-24 | 中国电子科技集团公司第三十八研究所 | High-power amplifier power supply modulation circuit with negative pressure protection |
| CN113839625B (en) * | 2021-09-29 | 2023-06-27 | 中国电子科技集团公司第三十八研究所 | High-power amplifier power supply modulating circuit with negative pressure protection |
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