CN113030551A - Overcurrent detection circuit, overcurrent detection method, and storage medium - Google Patents
Overcurrent detection circuit, overcurrent detection method, and storage medium Download PDFInfo
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- CN113030551A CN113030551A CN201911345309.3A CN201911345309A CN113030551A CN 113030551 A CN113030551 A CN 113030551A CN 201911345309 A CN201911345309 A CN 201911345309A CN 113030551 A CN113030551 A CN 113030551A
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- 238000001514 detection method Methods 0.000 title claims abstract description 67
- 230000003321 amplification Effects 0.000 claims abstract description 52
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 52
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to an overcurrent detection circuit for detecting an overcurrent in a current of a power amplification module, the overcurrent detection circuit including: a current-voltage conversion unit that converts the current of the power amplification module into a 1 st voltage; a reference voltage generating unit that generates a reference voltage; a comparison unit that compares the 1 st voltage with the reference voltage and determines that an overcurrent is present when the 1 st voltage is greater than the reference voltage; and a control unit that controls the reference voltage generated by the reference voltage generation unit, wherein when the overcurrent detection circuit detects an overcurrent, the control unit stops the operation of the power amplification module and increases the reference voltage generated by the reference voltage generation unit.
Description
Technical Field
The present invention relates to an overcurrent detection circuit, an overcurrent detection method, and a storage medium, and more particularly, to an overcurrent detection circuit, an overcurrent detection method, and a storage medium that can prevent unnecessary repeated activation and deactivation of a power amplification module.
Background
In the conventional overcurrent detection circuit, a bus current from the power amplification module is converted into a bus voltage, the bus voltage is converted into a divided voltage by the voltage dividing circuit, the divided voltage is compared with a threshold voltage, and when the divided voltage is greater than the threshold voltage, that is, when an overcurrent occurs as shown in fig. 4, it is determined that an overcurrent has flowed through the power amplification module, and the operation of the power amplification module is stopped.
Disclosure of Invention
Technical problem to be solved by the invention
However, in the conventional overcurrent detection circuit, when the power supply voltage continuously generates a temporary voltage variation, the overcurrent detection circuit determines that an overcurrent is present many times in a short time, and the controller repeatedly starts and stops the power amplification module. This is undesirable. When the power supply voltage continuously generates a temporary voltage variation rather than an overcurrent, the operation of the power amplification module does not need to be stopped.
Technical solution for solving technical problem
The present invention has been made in view of the above problems, and an object of the present invention is to provide an overcurrent detection circuit for detecting an overcurrent in a power amplification module, the overcurrent detection circuit including:
a current-voltage conversion unit that converts the current of the power amplification module into a 1 st voltage;
a reference voltage generating unit that generates a reference voltage;
a comparison unit that compares the 1 st voltage with the reference voltage and determines that an overcurrent is present when the 1 st voltage is greater than the reference voltage; and
a control unit that controls the reference voltage generated by the reference voltage generation unit,
when the overcurrent detection circuit detects an overcurrent, the control unit stops the operation of the power amplification module and increases the reference voltage generated by the reference voltage generation unit.
In the second aspect of the present invention, as in the overcurrent detection circuit of the first aspect, preferably,
when the overcurrent detection circuit detects that the power amplification module has an overcurrent for a time period exceeding 1 st time period, the operation of the power amplification module is stopped.
In the third aspect of the present invention, as in the overcurrent detection circuit of the first or second aspect, preferably,
the reference voltage generating section has a variable resistor, generates the reference voltage based on the variable resistor,
the control section controls the reference voltage generating section by changing a resistance value of the variable resistor.
In a fourth aspect of the present invention, as in the overcurrent detection circuit of the first or second aspect, preferably,
the control unit increases the reference voltage at a predetermined ratio when increasing the reference voltage.
In a fifth aspect of the present invention, as in the overcurrent detection circuit of the first or second aspect, preferably,
the reference voltage has a maximum value and the reference voltage has a maximum value,
and reporting an error when the control part judges that the reference voltage reaches the maximum value.
In a sixth aspect of the present invention, as in the overcurrent detection circuit of the first or second aspect, preferably,
the control part is under the condition that the reference voltage is increased and the reference voltage does not reach the maximum value, the comparison part compares the 2 nd voltage obtained by the current-voltage conversion part with the reference voltage increased by the reference voltage generation part, and the power amplification module is restarted and the reference voltage is recovered to the value before the increase when the state of the 2 nd voltage below the reference voltage exceeds the 2 nd time.
A seventh aspect of the present invention relates to an overcurrent detection method for detecting an overcurrent of a current of a power amplification module, including the steps of:
a current-voltage conversion step of converting a current of the power amplification module into a 1 st voltage;
a reference voltage generation step of generating a reference voltage;
a comparison step of comparing the 1 st voltage with the reference voltage and determining that an overcurrent exists when the 1 st voltage is greater than the reference voltage; and
a control step of controlling the reference voltage generated in the reference voltage generation step by a control unit,
when the overcurrent detection method detects an overcurrent, the control unit stops the operation of the power amplification module and increases the reference voltage generated in the reference voltage generation step.
In an eighth aspect of the present invention, as the overcurrent detection method of the seventh aspect, preferably,
when the overcurrent detection circuit detects that the power amplification module has an overcurrent for a time period exceeding 1 st time period, the operation of the power amplification module is stopped.
In the ninth aspect of the present invention, as in the overcurrent detection method of the seventh or eighth aspect, preferably,
the reference voltage generating step generates the reference voltage based on a variable resistance,
in the control step, the reference voltage generating section is controlled by changing a resistance value of the variable resistor.
In the tenth aspect of the present invention, as in the overcurrent detection method of the seventh or eighth aspect, preferably,
the control unit increases the reference voltage at a predetermined ratio when increasing the reference voltage.
In the eleventh aspect of the present invention, as in the overcurrent detection method of the seventh or eighth aspect, preferably,
the reference voltage has a maximum value and the reference voltage has a maximum value,
and reporting an error when the control part judges that the reference voltage reaches the maximum value.
In the twelfth aspect of the present invention, as in the overcurrent detection method of the seventh or eighth aspect, preferably,
and the control unit compares the 2 nd voltage obtained in the current-voltage conversion step with the reference voltage increased in the reference voltage generation step in the comparison step when the reference voltage is increased and the reference voltage does not reach a maximum value, and restarts the power amplification module and restores the reference voltage to a value before the increase when a state in which the 2 nd voltage is equal to or lower than the reference voltage exceeds a 2 nd time.
A thirteenth aspect of the present invention relates to a storage medium storing a program for causing a computer to execute the overcurrent detection method according to the seventh to twelfth aspects.
Effects of the invention
According to the overcurrent detection circuit, the overcurrent detection method, and the storage medium of the present invention, it is possible to prevent the operation of the power amplification module from being unnecessarily repeated started and stopped when the power supply voltage continuously generates a temporary voltage variation, and thus, it is possible to contribute to the normal operation of the power amplification module.
Drawings
Fig. 1 is a block diagram showing a configuration of an overcurrent detection circuit 1 of a power amplification module according to the present invention.
Fig. 2 is a flowchart showing an overcurrent detection method of the overcurrent detection circuit 1 according to the present invention.
Fig. 3 is a circuit diagram showing the reference voltage generating unit 3 according to the present invention.
Fig. 4 is a waveform diagram showing the current output from the power amplification module when an overcurrent is generated.
Detailed Description
In the following, preferred embodiments of the overcurrent detection circuit 1 according to the present invention will be described with reference to the drawings, but the same or corresponding portions in the drawings will be described with the same reference numerals.
Embodiment mode 1
Fig. 1 is a block diagram showing a configuration of an overcurrent detection circuit 1 of a power amplification module according to the present invention. As shown in fig. 1, an overcurrent detection circuit 1 according to the present invention includes a current-voltage conversion unit 2, a reference voltage generation unit 3, a control unit 4, and a comparison unit 5.
The current-voltage converter 2 receives a bus current I, which is a current from the power amplification module 6, and converts the bus current I into a comparison voltage V1 proportional to the bus current I.
The control unit 4 outputs a control command C to the reference voltage generation unit 3refFor control, the reference voltage generating part 3 is controlled according to the control command C of the control part 4refAnd outputs a reference voltage V2. The control method of the reference voltage generation unit 3 by the control unit 4, that is, the generation method of the reference voltage V2 will be described later in detail.
The comparison unit 5 compares the comparison voltage V1 with the output reference voltage V2, outputs the comparison result a to the control unit 4, and when it is detected that the comparison voltage V1 > the output reference voltage V2, the control unit 4 outputs a control command C to the power amplification module 6AMPTo stop the operation of the power amplification module 6.
Hereinafter, an overcurrent detection method of the overcurrent detection circuit 1 according to the present invention will be described with reference to fig. 2.
Fig. 2 is a flowchart showing an overcurrent detection method of the overcurrent detection circuit 1 according to the present invention.
After the start of step S101, the overcurrent detection method of the overcurrent detection circuit 1 according to the present invention proceeds to step S102, where the comparison unit 5 compares the comparison voltage V1 converted by the current-voltage conversion unit 2 with the reference voltage V2 (in this case, the reference voltage V2 is an initial value) output by the reference voltage generation unit, and the control unit 4 determines whether or not the comparison voltage V1 > the reference voltage V2 based on the comparison result of the comparison unit 5, and whether or not the comparison voltage V1 > the reference voltage V2In the case of (1), that is, when the comparison voltage V1 is less than or equal to the reference voltage V2, that is, when the power amplification module 6 does not generate an overcurrent, the process returns to step S101, and proceeds to step S102 to continuously determine whether the comparison voltage V1 > the reference voltage V2. On the other hand, if yes in step S102, that is, if the comparison voltage V1 > the reference voltage V2, the process proceeds to step S103, and it is determined whether or not the time t has elapsed in a state where the comparison voltage V1 > the reference voltage V21The time t1For example 100 milliseconds. If no in step S103, the process returns to step S102, and it is continuously determined whether or not the comparison voltage V1 > the reference voltage V2. In the case of YES in step S103, that is, in a state where the comparison voltage V1 > the reference voltage V2, the elapsed time t1Then, the process proceeds to step S104, and the control unit 4 determines that a continuous overcurrent is generated, and stops the operation of the power amplification module 6 to perform protection.
Subsequently, the process proceeds to step S105, and the control unit 4 increases the reference voltage V2, that is, increases the threshold voltage for determining whether or not an overcurrent is generated. As for the manner in which the reference voltage V2 increases, the fixed value may be increased every time, for example, 5V every time, or the reference voltage V2 may be increased stepwise, for example, 5V is increased for the first time, 10V is increased for the second time, or the like. Those skilled in the art can adapt various increasing modes of the reference voltage V2 according to the needs.
Subsequently, the process proceeds to step S106, and the control unit 4 determines whether or not the increased reference voltage V2 reaches the maximum reference voltage V2maxThe control unit 4 determines that the reference voltage V2 increased at least once reaches the maximum reference voltage VmaxIn the case of (3), the control unit 4 proceeds to step S110 while keeping the power amplification module 6 in a protection state, and reports an error.
The control unit 4 determines that the reference voltage V2 increased at least once has not reached the maximum reference voltage VmaxIn the case of (3), that is, in the case of no in step S106, the process proceeds to step S107. In step S107, the comparison voltage V1 is again compared with the reference voltage V2 (at this time, the reference voltage V2 is increased at least once) by the comparison section 5, and in the case of yes judgment in step S107, that is, the comparison voltage V1 > the reference voltageIn the case of V2, the control unit 4 determines that the overcurrent still exists in the power amplification module 6, and returns to step S103 to count the time when the overcurrent state exists. If the determination in step S107 is no, that is, if the comparison voltage V1 is less than or equal to the reference voltage V2 after the reference voltage V2 is increased, the routine proceeds to step S108.
In step S108, it is determined whether or not the time during which no overcurrent is generated has elapsed by the time threshold t2If yes in step S108, that is, if no overcurrent is generated, the time threshold t is set to the elapsed time2The process proceeds to step S109, and the control unit 4 reduces the reference voltage V2 and returns to step S101, and the above operation is repeated. That is, the elapsed time after determining that the overcurrent disappears exceeds the threshold t2In the case of (3), the control unit 4 recognizes that the overcurrent does not occur for a short time, and the normal operation can be resumed.
If no in step S108, that is, if no overcurrent is generated, the time threshold t has not elapsed2Then, the process returns to step S107 to continuously determine whether the comparison voltage V1 > the reference voltage, that is, whether the overcurrent is generated again.
According to the overcurrent detection circuit 1 of embodiment 1, when an overcurrent is detected in the power amplification module 6, the value of the reference voltage V2 for determining the occurrence of the overcurrent is increased, so that it is possible to avoid the power amplification module from being repeatedly restarted or stopped when a temporary voltage variation continuously occurs in the power supply voltage, which is advantageous for the normal operation of the power amplification module.
The specific structure of the reference voltage generator 3 is, for example, as shown in FIG. 3, constituted by a variable resistor RxA fixed resistor R1、R2Are connected in series. The control part 4 controls the variable resistor R in the reference voltage generating part 3xThe resistance value of (3) is changed to change the magnitude of the reference voltage V2. The specific configuration of the reference voltage generating unit 3 is not limited thereto, and can be specifically selected by those skilled in the art as needed.
In addition, the order of the steps in the present invention may be changed as needed, and is not limited to the order in the embodiment. For example, in the embodiment, when it is determined in step S107 that the comparison voltage V1 is equal to or less than the reference voltage V2 after the reference voltage V2 is increased, the process proceeds to step S108, and the control unit 4 restarts the power amplification module 6 to operate again, or when it is determined in step S109 that the comparison voltage V1 is equal to or less than the reference voltage V2, the control unit 4 may restart the power amplification module 6, that is, the comparison between step S108 and step S109 may be performed.
In the present invention, the embodiments may be freely combined, or may be appropriately modified or omitted within the scope of the invention.
The present invention has been described in detail, but the above description is only illustrative in all aspects, and the present invention is not limited thereto. Countless variations not illustrated are to be construed as conceivable without departing from the scope of the present invention.
Industrial application
The overcurrent detection circuit and the overcurrent detection method according to the present invention can be widely applied to a scene including a power amplification module, for example, a compressor having a power amplifier.
Description of the reference symbols
1: overcurrent detection circuit
2: current-voltage conversion unit
3: reference voltage generating unit
4: control unit
5: comparison part
6: and a power amplification module.
Claims (13)
1. An overcurrent detection circuit that detects an overcurrent in a current of a power amplification module, comprising:
a current-voltage conversion unit that converts the current of the power amplification module into a 1 st voltage;
a reference voltage generating unit that generates a reference voltage;
a comparison unit that compares the 1 st voltage with the reference voltage and determines that an overcurrent is present when the 1 st voltage is greater than the reference voltage; and
a control unit that controls the reference voltage generated by the reference voltage generation unit,
when the overcurrent detection circuit detects an overcurrent, the control unit stops the operation of the power amplification module and increases the reference voltage generated by the reference voltage generation unit.
2. The overcurrent detection circuit as recited in claim 1,
when the overcurrent detection circuit detects that the power amplification module has an overcurrent for a time period exceeding 1 st time period, the operation of the power amplification module is stopped.
3. The overcurrent detection circuit according to claim 1 or 2,
the reference voltage generating section has a variable resistor, generates the reference voltage based on the variable resistor,
the control section controls the reference voltage generating section by changing a resistance value of the variable resistor.
4. The overcurrent detection circuit according to claim 1 or 2,
the control unit increases the reference voltage at a predetermined ratio when increasing the reference voltage.
5. The overcurrent detection circuit according to claim 1 or 2,
the reference voltage has a maximum value and the reference voltage has a maximum value,
and reporting an error when the control part judges that the reference voltage reaches the maximum value.
6. The overcurrent detection circuit according to claim 1 or 2,
the control part is under the condition that the reference voltage is increased and the reference voltage does not reach the maximum value, the comparison part compares the 2 nd voltage obtained by the current-voltage conversion part with the reference voltage increased by the reference voltage generation part, and the power amplification module is restarted and the reference voltage is recovered to the value before the increase when the state of the 2 nd voltage below the reference voltage exceeds the 2 nd time.
7. An overcurrent detection method for detecting overcurrent of a current of a power amplification module, comprising the steps of:
a current-voltage conversion step of converting a current of the power amplification module into a 1 st voltage;
a reference voltage generation step of generating a reference voltage;
a comparison step of comparing the 1 st voltage with the reference voltage and determining that an overcurrent exists when the 1 st voltage is greater than the reference voltage; and
a control step of controlling the reference voltage generated in the reference voltage generation step by a control unit,
when the overcurrent detection method detects an overcurrent, the control unit stops the operation of the power amplification module and increases the reference voltage generated in the reference voltage generation step.
8. The overcurrent detection method according to claim 7,
when the overcurrent detection circuit detects that the power amplification module has an overcurrent for a time period exceeding 1 st time period, the operation of the power amplification module is stopped.
9. The overcurrent detection method according to claim 7 or 8,
the reference voltage generating step generates the reference voltage based on a variable resistance,
in the control step, the reference voltage generating section is controlled by changing a resistance value of the variable resistor.
10. The overcurrent detection method according to claim 7 or 8,
the control unit increases the reference voltage at a predetermined ratio when increasing the reference voltage.
11. The overcurrent detection method according to claim 7 or 8,
the reference voltage has a maximum value and the reference voltage has a maximum value,
and reporting an error when the control part judges that the reference voltage reaches the maximum value.
12. The overcurrent detection method according to claim 7 or 8,
and the control unit compares the 2 nd voltage obtained in the current-voltage conversion step with the reference voltage increased in the reference voltage generation step in the comparison step when the reference voltage is increased and the reference voltage does not reach a maximum value, and restarts the power amplification module and restores the reference voltage to a value before the increase when a state in which the 2 nd voltage is equal to or lower than the reference voltage exceeds a 2 nd time.
13. A storage medium storing a program that causes a computer to execute the overcurrent detection method according to any one of claims 7 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911345309.3A CN113030551A (en) | 2019-12-24 | 2019-12-24 | Overcurrent detection circuit, overcurrent detection method, and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911345309.3A CN113030551A (en) | 2019-12-24 | 2019-12-24 | Overcurrent detection circuit, overcurrent detection method, and storage medium |
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| CN113030551A true CN113030551A (en) | 2021-06-25 |
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| CN201911345309.3A Pending CN113030551A (en) | 2019-12-24 | 2019-12-24 | Overcurrent detection circuit, overcurrent detection method, and storage medium |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01167471A (en) * | 1987-12-22 | 1989-07-03 | Sawafuji Electric Co Ltd | Overcurrent protector for vibration cooler |
| KR950002307U (en) * | 1993-06-18 | 1995-01-04 | 신영종합시스템 주식회사 | Electronic overcurrent breaker |
| JPH10160769A (en) * | 1996-11-29 | 1998-06-19 | Aiwa Co Ltd | Overcurrent detection circuit |
| US20100164528A1 (en) * | 2008-12-29 | 2010-07-01 | Abidur Rahman | Methods and Apparatus to Test Electronic Devices |
| US20120063045A1 (en) * | 2010-09-10 | 2012-03-15 | Intersil Americas Inc. | Detecting and selectively ignoring power supply transients |
-
2019
- 2019-12-24 CN CN201911345309.3A patent/CN113030551A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01167471A (en) * | 1987-12-22 | 1989-07-03 | Sawafuji Electric Co Ltd | Overcurrent protector for vibration cooler |
| KR950002307U (en) * | 1993-06-18 | 1995-01-04 | 신영종합시스템 주식회사 | Electronic overcurrent breaker |
| JPH10160769A (en) * | 1996-11-29 | 1998-06-19 | Aiwa Co Ltd | Overcurrent detection circuit |
| US20100164528A1 (en) * | 2008-12-29 | 2010-07-01 | Abidur Rahman | Methods and Apparatus to Test Electronic Devices |
| US20120063045A1 (en) * | 2010-09-10 | 2012-03-15 | Intersil Americas Inc. | Detecting and selectively ignoring power supply transients |
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