CN107885304B - Voltage sudden change detection circuit - Google Patents
Voltage sudden change detection circuit Download PDFInfo
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- CN107885304B CN107885304B CN201710972048.2A CN201710972048A CN107885304B CN 107885304 B CN107885304 B CN 107885304B CN 201710972048 A CN201710972048 A CN 201710972048A CN 107885304 B CN107885304 B CN 107885304B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
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- Theoretical Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a voltage sudden change detection circuit, which comprises a discharge circuit and a voltage division circuit, wherein the discharge circuit is connected with the voltage division circuit; the voltage division circuit comprises a second capacitor C2 and a third capacitor C3 which are connected in series with each other, and the connection point is the output end of the voltage division circuit; the other end of the second capacitor C2 is connected with a main control power supply; the other end of the third capacitor C3 is grounded; when the voltage of the main control power supply suddenly changes, the output end of the voltage division circuit outputs a first level signal; the discharge circuit comprises a fourth resistor R4, one end of the fourth resistor R4 is connected with one end of the second capacitor C2, which is connected with the power supply, and the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, which is connected with the ground and is grounded. The technical scheme provided by the invention can sensitively detect the power supply fluctuation and give out a control signal in time for subsequent processing.
Description
The present application is a divisional application entitled "voltage jump detection circuit, reset circuit and electronic device" on application date 2015, 10/22/201510694640.1 of China.
Technical Field
The invention relates to the field of electronic circuits, in particular to a voltage sudden change detection circuit.
Background
At present, in the electrical field, a voltage detection circuit is a common application circuit, for example, in a system powered by a battery, in order to protect the battery, the voltage of the battery is generally detected by an MCU, two voltage thresholds, namely a low-voltage protection point and a protection unlocking point, are set, a detected voltage value and a set voltage threshold are compared, and a status determination is performed and a corresponding response is made. Generally, the setting requirement of the detection circuit on a voltage threshold is high, if the voltage threshold of the protection unlocking point is too low, when the voltage is abnormal, the voltage always fluctuates between the two voltage thresholds of the low-voltage protection point and the protection unlocking point, the control circuit can repeatedly reset the power supply circuit, and if the threshold of the protection unlocking point is too high, after the power supply circuit enters the protection, the power supply circuit cannot normally work due to the fact that the actual power supply voltage is not unlocked after the power supply problem of the circuit is solved.
In the prior art, high requirements on setting various thresholds in a detection circuit are required, processing of detection results needs to be performed by means of a processing chip and program design, design complexity is high, and cost is high.
Disclosure of Invention
The present invention is directed to a voltage jump detection circuit, a reset circuit and an electronic device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a voltage jump detection circuit, a reset circuit and an electronic device are constructed.
The voltage sudden change detection circuit comprises a discharge circuit and a voltage division circuit; wherein
The voltage division circuit comprises a second capacitor C2 and a third capacitor C3 which are connected in series, and the connection point is the output end of the voltage division circuit; the other end of the second capacitor C2 is connected with a main control power supply; the other end of the third capacitor C3 is grounded; when the voltage of the main control power supply suddenly changes, the output end of the voltage division circuit outputs a first level signal;
the discharge circuit comprises a fourth resistor R4, one end of the fourth resistor R4 is connected with one end of the second capacitor C2, which is connected with the power supply, and the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, which is connected with the ground and is grounded.
The reset circuit is used for initializing a main control chip and comprises a driving circuit, an execution circuit and the voltage mutation detection circuit;
the input end of the driving circuit is connected with the output end of the voltage sudden change detection circuit, and the output end of the driving circuit is connected with the input end of the execution circuit; when the input end of the driving circuit receives the first level signal, the output end of the driving circuit outputs a second level signal to the execution circuit;
the input end of the execution circuit is connected with the output end of the driving circuit, and the output end of the execution circuit is connected with the reset port of the main control chip; when the input end of the execution circuit receives the second level signal, the output end of the execution circuit outputs a reset signal to the reset port.
Preferably, the driving circuit comprises a transistor Q1, a second resistor R2 and a third resistor R3;
the base electrode of the triode Q1 is the input end of the driving circuit, and the collector electrode of the triode Q1 is the output end of the driving circuit;
the base electrode of the triode Q1 is connected with the output end of the voltage division circuit through the second resistor R2, the collector electrode of the triode Q1 is connected with the input end of the execution circuit, and the emitter electrode of the triode Q1 is grounded;
the base of the transistor Q1 is connected to ground through the third resistor R3.
Preferably, the execution circuit comprises a first resistor R1 and a first capacitor C1;
one end of the first resistor R1 is connected with an auxiliary power supply, and the other end is grounded through the first capacitor C1;
the connection point of the first resistor R1 and the first capacitor C1 is connected with the collector of the triode Q1 and serves as the input end of the execution circuit;
the connection point of the first resistor R1 and the first capacitor C1 is also connected with the reset port of the main control chip and serves as the output end of the execution circuit.
Preferably, the capacities of the second capacitor C2 and the third capacitor C3 of the voltage divider circuit are equal.
Preferably, the transistor Q1 is an NPN transistor.
Preferably, the master power supply is a replaceable battery.
Preferably, the main control chip is one or more of a single chip microcomputer, an ARM, a DSP, a CPU and an FPGA.
The electronic device comprises a reset circuit and a main control chip, wherein the reset circuit is used for initializing the main control chip, and the reset circuit is any one of the reset circuits.
Preferably, the electronic device comprises a battery powered product.
The voltage mutation detection circuit has the following beneficial effects: the power supply fluctuation can be sensitively detected, and a control signal can be given in time for subsequent processing.
Furthermore, in the battery protection system, the power supply fluctuation can be sensitively detected, the reset signal of the main control chip can be given out in time, the battery protection circuit is simplified, and the cost is saved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic circuit diagram of a voltage spike detection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit schematic of a reset circuit according to an embodiment of the present invention;
FIG. 3 is a waveform of the RESET circuit VCC \ MCUPOWER \ RESET \ Q1.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a voltage sudden change detection circuit, and meanwhile, the reset circuit can also be used as a common reset circuit, and the using effect is not different from that of the traditional reset circuit. The reset circuit is different from the traditional reset circuit in that the traditional reset circuit is reset by depending on the power-on of the power supply of the MCU, and the reset circuit can be reset by the mode and can be reset by the power-on of other power supplies or fluctuation in a certain range. Each is described in detail below.
As shown in fig. 1, the voltage sudden change detection circuit according to the embodiment of the present invention includes a discharge circuit 1 and a voltage division circuit 2. Wherein:
the voltage dividing circuit 2 comprises a second capacitor C2 and a third capacitor C3 which are connected in series, and the connection point is the output end of the voltage dividing circuit 2; the other end of the second capacitor C2 is connected with the main control power supply; the other end of the third capacitor C3 is grounded; when the voltage of the main control power supply suddenly changes, the output end of the voltage division circuit 2 outputs a first level signal. Specifically, the second capacitor C2 and the third capacitor C3 are voltage dividing capacitors, the withstand voltage value of the voltage dividing capacitors is larger than the maximum voltage of the battery, the time length of the reset signal is determined by the capacity, the voltage dividing result is different due to different capacities, the capacity can be adjusted according to actual needs, and the capacitors with the same capacity are selected, namely the capacities of the second capacitor C2 and the third capacitor C3 of the voltage dividing circuit 2 are equal.
The discharge circuit 1 comprises a fourth resistor R4, one end of the fourth resistor R4 is connected with one end of the second capacitor C2, which is connected with the power supply, and the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, which is connected with the ground and is grounded.
The realization principle of the voltage mutation detection circuit of the embodiment of the invention is based on the following principle: because the capacitor has the characteristic of isolating direct current, when the main control power supply has larger voltage fluctuation through the characteristic of alternating current, the capacitor is similar to the characteristic of alternating current, and then the C2 and the C3 are connected in series to divide the voltage of the main control power supply according to the capacity of the capacitor. The voltage at the instant of the sudden change in voltage divided to C3 gives a first level signal that can be used in many ways, where the reset circuit is just one application. For example, after the voltage rectified by the alternating current is subjected to resistance voltage division and current limitation and capacitance filtering, if fluctuation exceeding a certain amplitude exists, the voltage can be detected by the voltage sudden change detection circuit. When the voltage of the main control power supply is stabilized, the voltage directly acts on the C2, and the voltage is in a direct current characteristic and is isolated by the C2 and cannot be divided into C3.
The voltage sudden change detection circuit provided by the embodiment of the invention can sensitively detect the power supply fluctuation and give a control signal in time for subsequent processing.
As shown in fig. 2, the reset circuit according to the embodiment of the present invention is used to initialize the main control chip, and includes a driving circuit 3, an execution circuit 4, and the voltage jump detection circuit. Wherein:
the input end of the driving circuit 3 is connected with the output end of the voltage dividing circuit 2 of the voltage sudden change detection circuit, and the output end of the driving circuit 3 is connected with the input end of the execution circuit 4; when the input terminal of the driving circuit 3 receives the first level signal, the output terminal of the driving circuit 3 outputs a second level signal to the execution circuit 4. In the reset circuit according to the embodiment of the present invention, the driving circuit 3 includes a transistor Q1, a second resistor R2, and a third resistor R3; the base electrode of the triode Q1 is the input end of the drive circuit 3, and the collector electrode of the triode Q1 is the output end of the drive circuit 3; the base electrode of the triode Q1 is connected with the output end of the voltage division circuit 2 through a second resistor R2, the collector electrode of the triode Q1 is connected with the input end of the executive circuit 4, and the emitter electrode of the triode Q1 is grounded; the base of transistor Q1 is connected to ground through a third resistor R3. The transistor Q1 is an NPN type transistor. It should be understood that the driving circuit 3 is not limited to a transistor, and in theory, the transistor may be replaced by another circuit, and the transistor may be changed into another device, such as an operational amplifier IC, or an interrupt port of the MCU directly after the R3 is connected in parallel with a voltage regulator. The requirement of the driving circuit 3 is not high, if the voltage change is large, the MOS tube can be driven after voltage division, namely the voltage of the C3 after voltage division is more than 2.5V, and the MOS tube can be changed.
The input end of the execution circuit 4 is connected with the output end of the drive circuit 3, and the output end of the execution circuit 4 is connected with the reset port of the main control chip; when the input terminal of the execution circuit 4 receives the second level signal, the output terminal of the execution circuit 4 outputs a reset signal to the reset port. In the reset circuit according to the embodiment of the present invention, the execution circuit 4 includes a first resistor R1 and a first capacitor C1; one end of the first resistor R1 is connected with the auxiliary power supply, and the other end is grounded through a first capacitor C1; the connection point of the first resistor R1 and the first capacitor C1 is connected with the collector of the triode Q1 and is used as the input end of the executive circuit 4; the connection point of the first resistor R1 and the first capacitor C1 is also connected to the reset port of the main control chip as the output terminal of the execution circuit 4.
The realization principle of the reset circuit of the embodiment of the invention is based on the following principle: because the capacitor has the characteristic of isolating direct current, the direct current of the battery is equivalent to a transient sudden change voltage for the capacitor at the moment of inserting the battery through the characteristic of alternating current, and the direct current is similar to the characteristic of alternating current, at the moment, the second capacitor C2 and the third capacitor C3 are connected in series to divide the voltage of the battery, and the voltage of the battery is distributed according to the capacity of the capacitor. When the battery is plugged, the battery voltage directly acts on the second capacitor C2, and the battery voltage is dc-isolated by the second capacitor C2 and cannot be divided into the third capacitor C3. The voltage instantly distributed to the third capacitor C3 by the battery is inserted to drive the subsequent circuit and give a reset signal until the power consumption of the third capacitor C3 is finished. If the voltage changes slowly, even if the voltage is divided by the C3, the electricity of the C3 is discharged through the R2 and the R3, the triode is not sufficiently conducted, and meanwhile, the R2 and the R3 also have a certain function of preventing misoperation.
The voltage divided by the third capacitor C3 is divided by the second resistor R2 and the third resistor R3 to drive the triode Q1, after the triode Q1 is turned on, the voltage on the first capacitor C1 is pulled down to generate a reset signal, at this time, due to the isolated direct current effect of the capacitors, the second capacitor C2 isolates the input voltage to continue charging the third capacitor C3, when the electric quantity on the third capacitor C3 is consumed through the second resistor R2 and the third resistor R3, the triode Q1 is turned off, the first capacitor C1 is charged by the MCU power through the first resistor R1, and the reset is finished. The fourth resistor R4 discharges the electricity in the second capacitor C2 when the battery is replaced, and if the electricity is not discharged, the battery voltage and the voltage in the second capacitor C2 will cancel each other, so that the voltage cannot be divided to the third capacitor C3 or the divided voltage is insufficient, and the transistor cannot be driven.
Further, the main control power supply is a replaceable battery. Still further, the main control chip is one or more of a single chip microcomputer, an ARM, a DSP, a CPU and an FPGA.
Fig. 3 shows the actual waveforms of VCC, MCUPOWER, RESET, base of transistor Q1 RESET by the replacement battery MCU after the battery undervoltage protection and battery voltage ramp-up are over. Channel 1 represents the VCC waveform, channel 2 represents the MCUPOWER waveform, channel 3 represents the RESET waveform, and channel 4 represents the base waveform of transistor Q1.
As shown in fig. 3, the channel 1 represents the VCC voltage, and represents the battery voltage in actual use, and as can be seen from the waveform diagram, the VCC voltage drops from 12V to about 8V within 650ms, and at this time, the MCU voltage 5V represented by the channel 2 has not changed, and if the conventional reset circuit is used, the battery replacement is completed, but there is no reset. With the present invention, VCC rises to 12V due to battery replacement. Channel 3 represents the RESET leg RESET waveform. Channel 4 represents the base voltage of the transistor and is also approximately equal to the voltage on the third capacitor C3. At the same time that the VCC voltage rises, the third capacitor C3 divides the voltage to drive the transistor Q1, which is derived from the channel 4 waveform, the divided voltage of C3 is about 0.8V, and drives the transistor for about 20ms, at which time a reset level is generated for about 10 ms. The battery is replaced at a high speed, the time is about 650ms, the voltage fluctuation of the power supply end is about 5V due to the existence of the capacitor, the voltage of the power supply end of the MCU is unchanged due to the function of the capacitor, and the common reset circuit cannot play a role.
The invention also provides an electronic device, which comprises a reset circuit and a main control chip, wherein the reset circuit is used for initializing the main control chip, and the reset circuit is any one of the reset circuits. Preferably, the electronic device comprises a battery powered product.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (3)
1. The voltage sudden change detection circuit is characterized by comprising a discharge circuit and a voltage division circuit; wherein
The voltage division circuit comprises a second capacitor C2 and a third capacitor C3 which are connected in series, and the connection point is the output end of the voltage division circuit; the other end of the second capacitor C2 is connected with a main control power supply; the other end of the third capacitor C3 is grounded; when the voltage of the main control power supply suddenly changes, the output end of the voltage division circuit outputs a first level signal;
the discharge circuit comprises a fourth resistor R4, one end of the fourth resistor R4 is connected with one end of the second capacitor C2, which is connected with the power supply, and the other end of the fourth resistor R4 is connected with one end of the third capacitor C3, which is connected with the ground and is grounded.
2. The sudden voltage change detection circuit according to claim 1, wherein the capacities of the second capacitor C2 and the third capacitor C3 of the voltage divider circuit are equal.
3. The voltage discontinuity detection circuit according to claim 1, wherein said master power supply is a replaceable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710972048.2A CN107885304B (en) | 2015-10-22 | 2015-10-22 | Voltage sudden change detection circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510694640.1A CN105242766B (en) | 2015-10-22 | 2015-10-22 | A kind of voltage jump detection circuit, reset circuit and electronic installation |
| CN201710972048.2A CN107885304B (en) | 2015-10-22 | 2015-10-22 | Voltage sudden change detection circuit |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510694640.1A Division CN105242766B (en) | 2015-10-22 | 2015-10-22 | A kind of voltage jump detection circuit, reset circuit and electronic installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107885304A CN107885304A (en) | 2018-04-06 |
| CN107885304B true CN107885304B (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710972048.2A Active CN107885304B (en) | 2015-10-22 | 2015-10-22 | Voltage sudden change detection circuit |
| CN201510694640.1A Expired - Fee Related CN105242766B (en) | 2015-10-22 | 2015-10-22 | A kind of voltage jump detection circuit, reset circuit and electronic installation |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510694640.1A Expired - Fee Related CN105242766B (en) | 2015-10-22 | 2015-10-22 | A kind of voltage jump detection circuit, reset circuit and electronic installation |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN107885304B (en) |
| WO (1) | WO2017067306A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107885304B (en) * | 2015-10-22 | 2021-03-30 | 深圳拓邦股份有限公司 | Voltage sudden change detection circuit |
| CN107168814A (en) * | 2017-06-22 | 2017-09-15 | 芯海科技（深圳）股份有限公司 | A kind of device and method for solving system in case of system halt |
| CN107800168B (en) * | 2017-11-07 | 2023-05-26 | 莱克电气股份有限公司 | Battery protection circuit and cordless electric tool |
| CN111014084A (en) * | 2019-12-09 | 2020-04-17 | 深圳市众能达自动化设备有限公司 | Detection circuit and detection method for internal flashover of capacitor or battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407701A (en) * | 2001-08-17 | 2003-04-02 | Tdk株式会社 | Switch power supply device |
| CN1845414A (en) * | 2006-04-27 | 2006-10-11 | 北京中星微电子有限公司 | Protection circuit for resisting power supply abrupt change |
| CN102255549A (en) * | 2011-07-20 | 2011-11-23 | 珠海金电电源工业有限公司 | Switching power supply application circuit |
| CN204290287U (en) * | 2014-11-26 | 2015-04-22 | 北京寓乐世界教育科技有限公司 | A kind of Micro Energy Lose protective circuit of contest robot master controller |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100530320C (en) * | 2006-04-28 | 2009-08-19 | 鸿富锦精密工业（深圳）有限公司 | Electric voltage detecting circuit and electric discharge lamp driven apparatus using same |
| US7782582B2 (en) * | 2007-12-19 | 2010-08-24 | Mindspeed Technologies, Inc. | High voltage tolerant electrostatic discharge protection circuit |
| US20140312928A1 (en) * | 2013-04-19 | 2014-10-23 | Kool Chip, Inc. | High-Speed Current Steering Logic Output Buffer |
| CN203658448U (en) * | 2013-12-18 | 2014-06-18 | 上海思瑞在线监测技术有限公司 | Overvoltage monitoring sensor for bushing |
| CN104020705A (en) * | 2014-06-23 | 2014-09-03 | 苏州塔可盛电子科技有限公司 | Power monitoring circuit with resetting function |
| CN205139833U (en) * | 2015-10-22 | 2016-04-06 | 深圳拓邦股份有限公司 | Voltage jump detection circuitry , reset circuit and electron device |
| CN107885304B (en) * | 2015-10-22 | 2021-03-30 | 深圳拓邦股份有限公司 | Voltage sudden change detection circuit |
-
2015
- 2015-10-22 CN CN201710972048.2A patent/CN107885304B/en active Active
- 2015-10-22 CN CN201510694640.1A patent/CN105242766B/en not_active Expired - Fee Related
-
2016
- 2016-08-16 WO PCT/CN2016/095497 patent/WO2017067306A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407701A (en) * | 2001-08-17 | 2003-04-02 | Tdk株式会社 | Switch power supply device |
| CN1845414A (en) * | 2006-04-27 | 2006-10-11 | 北京中星微电子有限公司 | Protection circuit for resisting power supply abrupt change |
| CN102255549A (en) * | 2011-07-20 | 2011-11-23 | 珠海金电电源工业有限公司 | Switching power supply application circuit |
| CN204290287U (en) * | 2014-11-26 | 2015-04-22 | 北京寓乐世界教育科技有限公司 | A kind of Micro Energy Lose protective circuit of contest robot master controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105242766A (en) | 2016-01-13 |
| CN105242766B (en) | 2017-11-28 |
| WO2017067306A1 (en) | 2017-04-27 |
| CN107885304A (en) | 2018-04-06 |
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