CN106549641B - Protective circuit - Google Patents
Protective circuit Download PDFInfo
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- CN106549641B CN106549641B CN201510591320.3A CN201510591320A CN106549641B CN 106549641 B CN106549641 B CN 106549641B CN 201510591320 A CN201510591320 A CN 201510591320A CN 106549641 B CN106549641 B CN 106549641B
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- power supply
- voltage
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- voltage threshold
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
Abstract
The invention discloses a protection circuit, at least comprising: the input circuit is used for outputting power supply voltage to the processing circuit for multiple times when the power supply is electrified or after the power supply is electrified; after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit; the processing circuit is used for comparing the power supply voltage with a first voltage threshold value, comparing the power supply voltage with a second voltage threshold value, and outputting the first voltage threshold value to the output circuit when the power supply voltage is greater than the second voltage threshold value and is less than or equal to the first voltage threshold value; and the output circuit is used for comparing the power supply voltage with the first voltage threshold value, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the first voltage threshold value. The invention simply realizes the protection of different circuits and ensures the reliability.
Description
Technical Field
The present invention relates to the field of circuits, and more particularly, to a protection circuit.
Background
The power amplifier is a main component of the wireless communication device, and a static operating point (also called gate voltage of the power amplifier, referred to as gate voltage for short) of the power amplifier is a necessary condition for the normal operation of the power amplifier. Fig. 1 is a schematic diagram of the location of a protection circuit in a power amplifier. As shown in fig. 1, the power amplifier is generally designed in a mode of a Microcontroller (MCU), a Digital to Analog Converter (DAC), a DAC chip provides a gate voltage (i.e., a voltage between a gate and a source of a Metal-Oxide Semiconductor Field-Effect Transistor (MOSFET)) for a power tube, and a protection circuit protects the power amplifier between the MCU, the DAC and each stage of the MOSFET of the power amplifier.
In practical applications, in order to ensure the normal operation of a circuit (such as a power amplifier), on one hand, a reliable DAC voltage output is required, and on the other hand, when the DAC output voltage is abnormal, corresponding protection measures are required to perform exception handling. The normal grid voltage of the MOSFET is provided by the output of the DAC chip, and the MCU corresponding to the DAC ensures the normal output of the voltage of the DAC through certain logic and algorithm; however, when the output voltage of the DAC is abnormal due to abnormality of the MCU + DAC (e.g., software error, interference of digital signals, etc.), corresponding abnormal protection is necessary to limit the abnormal voltage within a reasonable threshold, so as to ensure the normal and safe operation of the power amplifier.
The existing protection circuit has the following two realization modes, one is to protect the circuit to be protected by adopting a single-threshold circuit such as a mode of resistance voltage division or a clamping diode. When different circuits are protected in this way, different electronic elements (such as resistors with different resistances) need to be used to protect the different circuits because the different circuits have different threshold values, and therefore the implementation is complex. The other method is a software protection mode, namely, an ADC is used for voltage sampling, and when an abnormity is found, a corresponding protection strategy is implemented, so that the reliability of the method is low.
Disclosure of Invention
In order to solve the above problems, the present invention provides a protection circuit that can easily realize circuit protection and ensure reliability.
In order to achieve the above object, the present invention provides a protection circuit, at least comprising:
the input circuit is used for outputting power supply voltage to the processing circuit for multiple times when the power supply is electrified or after the power supply is electrified; after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit;
the processing circuit is used for comparing the power supply voltage with a first voltage threshold value, comparing the power supply voltage with a second voltage threshold value, and outputting the first voltage threshold value to the output circuit when the power supply voltage is greater than the second voltage threshold value and is less than or equal to the first voltage threshold value;
and the output circuit is used for comparing the power supply voltage with the first voltage threshold value, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the first voltage threshold value.
Preferably, the output circuit is further configured to:
and when the power supply voltage is greater than the first voltage threshold, outputting the first voltage threshold to supply power to the circuit to be protected.
Preferably, the processing circuit is further configured to:
outputting the second voltage threshold to the output circuit when the supply voltage is less than or equal to the second voltage threshold, or greater than the first voltage threshold;
the output circuit is further configured to:
and comparing the power supply voltage with the second voltage threshold, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the second voltage threshold.
Preferably, the output circuit is further configured to:
and when the power supply voltage is greater than the second voltage threshold, outputting the second voltage threshold to supply power to the circuit to be protected.
Compared with the prior art, the technical scheme of the invention comprises the following steps: the input circuit is used for outputting power supply voltage to the processing circuit for multiple times when the power supply is electrified or after the power supply is electrified; after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit; the processing circuit is used for comparing the power supply voltage with a first voltage threshold value, comparing the power supply voltage with a second voltage threshold value, and outputting the first voltage threshold value to the output circuit when the power supply voltage is greater than the second voltage threshold value and is less than or equal to the first voltage threshold value; and the output circuit is used for comparing the power supply voltage with the first voltage threshold value, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the first voltage threshold value. According to the scheme of the invention, the proper voltage threshold is automatically selected by comparing the power supply voltage with the first voltage threshold and comparing the power supply voltage with the second voltage threshold, and for different circuits to be protected, electronic elements do not need to be replaced, so that the protection of different circuits is simply realized, and the reliability is ensured.
Drawings
The accompanying drawings in the embodiments of the present invention are described below, and the drawings in the embodiments are provided for further understanding of the present invention, and together with the description serve to explain the present invention without limiting the scope of the present invention.
Fig. 1 is a schematic diagram of a position of a conventional protection circuit in a power amplifier;
FIG. 2 is a schematic diagram of the structure of the protection circuit of the present invention;
FIG. 3 is a schematic diagram of an input circuit according to an embodiment of the protection circuit of the present invention;
FIG. 4 is a schematic diagram of a processing circuit according to an embodiment of the protection circuit of the present invention;
fig. 5 is a schematic structural diagram of an output circuit according to an embodiment of the protection circuit of the present invention.
Detailed Description
The following further description of the present invention, in order to facilitate understanding of those skilled in the art, is provided in conjunction with the accompanying drawings and is not intended to limit the scope of the present invention. In the present application, the embodiments and various aspects of the embodiments may be combined with each other without conflict.
Referring to fig. 2, the present invention also provides a protection circuit, which at least includes:
the input circuit is used for outputting power supply voltage to the processing circuit for multiple times when the power supply is electrified or after the power supply is electrified; after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit;
wherein, a 1-in-2 analog switch can be adopted to output power supply voltage to the processing circuit for many times when the power supply is electrified or after the power supply is electrified; and after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit.
The processing circuit is used for comparing the power supply voltage with a first voltage threshold value, comparing the power supply voltage with a second voltage threshold value, and outputting the first voltage threshold value to the output circuit when the power supply voltage is greater than the second voltage threshold value and is less than or equal to the first voltage threshold value;
the first single-window comparator may be used to compare the power supply voltage with a first voltage threshold, and the second single-window comparator may be used to compare the power supply voltage with a second voltage threshold. When the power supply voltage is greater than the second voltage threshold and less than or equal to the first voltage threshold, the first single-window comparator and the second single-window comparator output a high level to the first 2-to-1 analog switch, and the first 2-to-1 analog switch is adopted to output the first voltage threshold to the output circuit.
And the output circuit is used for comparing the power supply voltage with the first voltage threshold value, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the first voltage threshold value.
The third single-window comparator may be used to compare the power supply voltage with the first voltage threshold, and when the power supply voltage is less than or equal to the first voltage threshold, output a high level to the second 2-to-1 analog switch, and output the power supply voltage to the circuit to be protected by using the second 2-to-1 analog switch.
Further, in the protection circuit of the present invention, the output circuit is further configured to:
and when the power supply voltage is greater than the first voltage threshold, outputting the first voltage threshold to supply power to the circuit to be protected so as to realize the protection function of the circuit to be protected.
When the power supply voltage is greater than the first voltage threshold, a low level is output to the second 2-to-1 analog switch, and the second 2-to-1 analog switch is adopted to output the first voltage threshold to supply power to the circuit to be protected, so that the protection function of the circuit to be protected is realized.
In the protection circuit of the present invention, the processing circuit is further configured to:
when the power supply voltage is less than or equal to the second voltage threshold value or greater than the first voltage threshold value, outputting the second voltage threshold value to the output circuit;
when the power supply voltage is smaller than or equal to the second voltage threshold value or larger than the first voltage threshold value, the first single-window comparator and the second single-window comparator output low level to the first 2-to-1 analog switch, and the first 2-to-1 analog switch is adopted to output the second voltage threshold value to the output circuit.
The output circuit is further configured to:
and comparing the power supply voltage with the second voltage threshold, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the second voltage threshold.
And when the power supply voltage is less than or equal to the second voltage threshold, the third single-window comparator outputs a high level to the second 2-to-1 analog switch, and the second 2-to-1 analog switch outputs the power supply voltage to supply power to the circuit to be protected.
Wherein the output circuit is further configured to:
and when the power supply voltage is greater than the second voltage threshold, outputting the second voltage threshold to supply power for the circuit to be protected so as to realize the protection function of the circuit to be protected.
When the power supply voltage is greater than the second voltage threshold, the third single-window comparator outputs a low level to the second 2-to-1 analog switch, and the second 2-to-1 analog switch is adopted to output the second voltage threshold to supply power to the circuit to be protected, so that the protection function of the circuit to be protected is realized.
According to the scheme of the invention, the proper voltage threshold is automatically selected by comparing the power supply voltage with the first voltage threshold and comparing the power supply voltage with the second voltage threshold, and for different circuits to be protected, electronic elements do not need to be replaced, so that the protection of different circuits is simply realized, and the reliability is ensured.
The protection circuit of the present invention will be described in detail below by way of specific embodiments.
The protection circuit of the present invention includes: input circuitry, processing circuitry and output circuitry.
Referring to fig. 3, the input circuit 1 is divided into 2 to simulate a switch S1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C13, a capacitor C4 and a resistor R3. The VCC of the input circuit 1-2-split analog switch S1 is connected to a 5-volt (V) power supply and is grounded via a capacitor C4 (e.g., 0.1 microfarad (μ F)) for filtering, the S terminal is grounded via a parallel circuit of a resistor R3 (e.g., 4.75 kilo-ohms (k Ω)) and a capacitor C13 (e.g., 0.1 μ F), the a terminal of the input terminal is connected to a supply voltage VGS and is grounded via a parallel circuit of a capacitor C1 (e.g., 15 picofarads (pF)), a capacitor C2 (e.g., 0.1 μ F) and a capacitor C3 (e.g., 4.7 μ F), the B1 terminal of the output terminal is connected to the negative input terminal of the first single-window comparator D1 and the positive input terminal of the second single-window comparator D2 of the processing circuit, and the B0 terminal is connected to the negative input terminal of the third single-window comparator D3 and the B1 terminal of the second 2-selected analog switch S3.
Referring to fig. 4, the processing circuit includes a first single window comparator D1, a second single window comparator D2, a first 2-out-of-1 analog switch S2, a capacitor C5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, and a resistor R1. Wherein a positive input terminal of the first single window comparator D1 is connected to a first voltage threshold VTH, a negative power terminal is connected to ground, a positive power terminal is connected to a 5V power supply and is grounded via a parallel circuit between a capacitor C5 (e.g., 15pF) and a capacitor C6 (e.g., 0.1 μ F), an output terminal is connected to an output terminal of the second single window comparator D2 and is connected to an S terminal of the first 1-out-of-2 analog switch and is connected to the 5V power supply via a resistor R1 (e.g., 4.75k Ω), a negative input terminal of the second single window comparator is connected to a second voltage threshold VTL, a negative power terminal is connected to ground, the positive power terminal is connected to the 5V power supply and is grounded via a parallel circuit between a capacitor C7 (e.g., 15pF) and a capacitor C8 (e.g., 0.1 μ F), an input terminal B0 terminal of the first 1-out-of the first analog switch S2 is connected to the second voltage threshold VTL, an input terminal B1 terminal is connected to the first voltage threshold VTH, a voltage ground terminal, and is connected to ground via a capacitor C9 (e.g., 0.1 muf), the output terminal a being connected to the positive input terminal of a third single-window comparator D3 of the output circuit and to the input terminal B0 of a second 2-to-1 analog switch S3 of the output circuit.
Referring to fig. 5, the output circuit includes a third single-window comparator D3, a second 1-in-2 analog switch S3, a capacitor C10, a capacitor C11, a resistor R2, and a capacitor C12. The negative power supply end of the third single-window comparator D3 is grounded, the positive power supply end is connected to a 5V power supply and is grounded through a parallel circuit between a capacitor C10 (for example, 15pF) and a capacitor C11 (for example, 0.1 μ F), the output end is connected to the 5V power supply through a resistor R2 (for example, 4.75k Ω) and is connected to the enable end S of the second 2-to-1 analog switch S3, the ground end of the second 2-to-1 analog switch S3 is grounded, the VCC end is connected to the 5V power supply and is grounded through a capacitor C12 (for example, 0.1 μ F), and the output end a is connected to the input end of the circuit to be protected.
The working principle of the protection circuit is as follows:
when the power supply is powered on or after the power supply is powered on, inputting a high level C1 to an enabling end S of the 1/2/min analog switch S1 for multiple times, enabling an input end A and an output end B1 of the 1/2/min analog switch S1 to be gated, and inputting a power supply voltage to the first single-window comparator D1 and the second single-window comparator D2;
after a preset time after each time of outputting the power voltage to the processing circuit, the low level C1 is input to the enable terminal S of the 1/2/min analog switch S1, so that the input terminal a and the output terminal B0 of the 1/2/min analog switch S1 are gated, and the power voltage is input to the third single-window comparator D3 and the second 1-out-of-2 analog switch S3.
The first single-window comparator D1 compares the power voltage with a first voltage threshold VTH, the second single-window comparator D2 compares the power voltage with a second voltage threshold VTL, when the power voltage is greater than the second voltage threshold and less than or equal to the first voltage threshold, the first single-window comparator D1 and the second single-window comparator D2 output a high level C2 to an enable terminal S of the first 2-to-1 analog switch S2, so that an input terminal B1 of the first 2-to-1 analog switch S2 is gated with an output terminal A, and the first voltage threshold VTH is output as RF _ TH;
when the power supply voltage is less than or equal to the second voltage threshold VTL or greater than the first voltage threshold VTH, the first single-window comparator D1 and the second single-window comparator D2 output a low level C2 to the enable terminal S of the first 2-by-1 analog switch S2, so that the input terminal B0 of the first 2-by-1 analog switch S2 is turned on with the output terminal a, and the second voltage threshold VTL is output as RF _ TH;
the third single-window comparator D3 compares the power voltage with RF _ TH, and when the power voltage is less than or equal to RF _ TH, it indicates that no abnormality is detected, the third single-window comparator D3 outputs a high level C3 to the enable terminal S of the second 2-to-1 analog switch S3, so that the input terminal B1 and the output terminal a of the second 2-to-1 analog switch S3 are gated to output the power voltage;
when the power voltage is greater than RF _ TH, indicating that an abnormality is detected, the third single-window comparator D3 outputs a low level C3 to the enable terminal S of the second 2-to-1 analog switch S3, so that the input terminal B0 and the output terminal a of the second 2-to-1 analog switch S3 are gated to output RF _ TH.
The processing circuit has a function of latching the output RF _ TH.
The first voltage threshold VTH and the second voltage threshold VTL may be input through a resistor or a regulated power supply, and are implemented in the known technology of those skilled in the art, and are not used to limit the protection scope of the present invention, and are not described herein again.
In order to ensure that the power supply can still provide voltage for the circuit to be protected when the device of the protection circuit fails, the 1/2 analog switch S1 of the input circuit can be set to gate the input end a and the output end B0 by default and output the power supply voltage to the output circuit, and the input end B1 and the output end a of the second 2/1 analog switch S3 of the output circuit are set to gate by default and output the power supply voltage to the circuit to be protected by default.
It should be noted that the above-mentioned embodiments are only for facilitating the understanding of those skilled in the art, and are not intended to limit the scope of the present invention, and any obvious substitutions, modifications, etc. made by those skilled in the art without departing from the inventive concept of the present invention are within the scope of the present invention.
Claims (3)
1. A protection circuit, comprising at least:
the input circuit is used for outputting power supply voltage to the processing circuit for multiple times when the power supply is electrified or after the power supply is electrified; after the preset time after the power supply voltage is output to the processing circuit every time, the power supply voltage is output to the output circuit;
the processing circuit is used for comparing the power supply voltage with a first voltage threshold value, comparing the power supply voltage with a second voltage threshold value, outputting the first voltage threshold value to the output circuit when the power supply voltage is greater than the second voltage threshold value and less than or equal to the first voltage threshold value, and outputting the second voltage threshold value to the output circuit when the power supply voltage is less than or equal to the second voltage threshold value or greater than the first voltage threshold value;
the output circuit is used for comparing the power supply voltage with the first voltage threshold value, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the first voltage threshold value; and comparing the power supply voltage with the second voltage threshold, and outputting the power supply voltage to supply power to the circuit to be protected when the power supply voltage is less than or equal to the second voltage threshold.
2. The protection circuit of claim 1, wherein the output circuit is further configured to:
and when the power supply voltage is greater than the first voltage threshold, outputting the first voltage threshold to supply power to the circuit to be protected.
3. The protection circuit of claim 1, wherein the output circuit is further configured to:
and when the power supply voltage is greater than the second voltage threshold, outputting the second voltage threshold to supply power to the circuit to be protected.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510591320.3A CN106549641B (en) | 2015-09-16 | 2015-09-16 | Protective circuit |
| PCT/CN2016/081891 WO2017045409A1 (en) | 2015-09-16 | 2016-05-12 | Protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510591320.3A CN106549641B (en) | 2015-09-16 | 2015-09-16 | Protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106549641A CN106549641A (en) | 2017-03-29 |
| CN106549641B true CN106549641B (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510591320.3A Active CN106549641B (en) | 2015-09-16 | 2015-09-16 | Protective circuit |
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| Country | Link |
|---|---|
| CN (1) | CN106549641B (en) |
| WO (1) | WO2017045409A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116859814B (en) * | 2023-09-04 | 2023-12-19 | 巨翊医疗科技(苏州)有限公司 | Dual-MCU safety control method and system |
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| FR2646738B1 (en) * | 1989-05-03 | 1991-07-05 | Merlin Gerin | STATIC TRIGGER FOR A THREE-PHASE NETWORK PROTECTION CIRCUIT BREAKER FOR DETECTING THE TYPE OF FAULT |
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| CN101656513B (en) * | 2008-08-18 | 2012-05-30 | 邦讯技术股份有限公司 | Method for protecting power amplifier and protective circuit |
| CN101557203B (en) * | 2009-03-20 | 2011-06-08 | 深圳市民展科技开发有限公司 | Power amplifier with overcurrent protection |
| US9559639B2 (en) * | 2009-08-19 | 2017-01-31 | Qualcomm Incorporated | Protection circuit for power amplifier |
| CN102759655B (en) * | 2011-04-29 | 2016-03-16 | 飞兆半导体公司 | The testing circuit of multi-power source voltage and detection method |
| CN103108427B (en) * | 2011-11-14 | 2015-05-13 | 深圳市长运通光电技术有限公司 | Light emitting diode (LED) drive chip, LED lamp and high voltage monitoring protection circuit |
| US9379675B2 (en) * | 2014-02-20 | 2016-06-28 | Analog Devices Global | Power detector with overdrive detection |
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- 2015-09-16 CN CN201510591320.3A patent/CN106549641B/en active Active
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2016
- 2016-05-12 WO PCT/CN2016/081891 patent/WO2017045409A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995031035A1 (en) * | 1994-05-10 | 1995-11-16 | Ericsson Inc. | Thermally controlled, linear power reduction circuit |
| CN101142520A (en) * | 2005-03-16 | 2008-03-12 | Lg化学株式会社 | Method and apparatus for controlling electrochromic device |
| CN101364730A (en) * | 2008-06-06 | 2009-02-11 | 深圳创维－Rgb电子有限公司 | Input voltage protection circuit |
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| CN103532201A (en) * | 2013-10-28 | 2014-01-22 | 无锡中星微电子有限公司 | Quick charge circuit for battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106549641A (en) | 2017-03-29 |
| WO2017045409A1 (en) | 2017-03-23 |
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