CN201589807U - Voltage detection circuit of reset circuit - Google Patents
Voltage detection circuit of reset circuit Download PDFInfo
- Publication number
- CN201589807U CN201589807U CN2009202623745U CN200920262374U CN201589807U CN 201589807 U CN201589807 U CN 201589807U CN 2009202623745 U CN2009202623745 U CN 2009202623745U CN 200920262374 U CN200920262374 U CN 200920262374U CN 201589807 U CN201589807 U CN 201589807U
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- detecting circuit
- voltage detecting
- resistance
- electronic switch
- power supply
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Abstract
The utility model provides a voltage detection circuit of a reset circuit, which comprises an electronic switch and a voltage-stabilizing diode; the cathode of the voltage-stabilizing diode is connected with a system power supply, the anode is connected with first pole of the electronic switch through a first resistor and is connected with the ground through a second resistor, the second pole of the electronic switch is connected with a standby power supply through a third resistor, and the third pole of the electronic switch is connected with one end of a fourth resistor, and the other end of the fourth resistor is used as an output end for outputting a chip reset signal. The voltage detection circuit of the reset circuit employing better implementation mode can solve the defect that the reset circuit in prior art has the fault caused by the system power supply with slower energy consumption than that of the standby power supply; the voltage detection circuit has simple circuit, can regulate the voltage detection potential according to different situations, has high transportability, adopts discrete components, has good regulation performance, low cost and high reliability.
Description
Technical field
The utility model belongs to the voltage detecting circuit technical field, relates in particular to a kind of voltage detecting circuit of reset circuit.
Background technology
In various household electrical appliance; usually can use various reset circuits, the reset circuit that adopts integrated circuit (IC) chip is arranged, the reset circuit that uses discrete component is also arranged; consider the factor of each side such as cost, now the most frequently used is the reset circuit that adopts discrete component.
With reference to figure 1, it is a kind of reset circuit common in the prior art, wherein, because the voltage at capacitor C 1 two ends can not suddenly change, so the voltage of the base stage B of triode Q1 by resistance R 2 samplings is low, and its emitter-base bandgap grading E voltage be height when power supply+3.3_STB powered on, this moment emitter-base bandgap grading E and collector C conducting, thereby make collector C for high, at this moment Shu Chu chip Restart Signal MCURESET is a high level, and chip MCU resets effectively.Subsequently, to capacitor C 1 charging, when the base stage B of triode Q1 current potential was (3.3-0.7-0.6)=2V, triode Q1 ended power supply+3.3_STB by resistance R 1, and chip Restart Signal MCURESET signal is a low level, and chip MCU resets and removes.
When power supply+3.3_STB power down, the electric charge of capacitor C 1 is by 1 pin of diode component D1 and the diode discharge between 3 pin, along with the reduction of+3.3_STB current potential reduces rapidly, the base stage B current potential step-down of triode Q1 then, and owing to the reason of energy storage capacitor C2 makes triode Q1 conducting, chip Restart Signal MCURESET becomes height, falls by resistance R 4 complete bleed offs up to electric charge.The effect of voltage stabilizing diode D2 is a current potential of stablizing chip Restart Signal MCURESET, prevents+the reset pin MCU RESET PIN of defective chip when 3.3_STB voltage has overshoot that resistance R 3 and capacitor C 3 play the anti-interference effect of current limliting.
The advantage of above-mentioned reset circuit is that cost is lower, can reach the purpose of regulating the reset signal parameter in addition by the parameter of regulating each device, uses flexibly.But, the power supply that household electrical appliance adopt provides two-way or the different voltage of multichannel more usually, different power consumption requirement when satisfying start with standby usually occurs thus that the different voltage in each road powers on and the different situation of power down order, and this just may cause different types of system failure.
For example, power supply module is fed to machine core board one road 12V voltage and one tunnel+3.3_STB voltage in certain a televisor, wherein+3.3_STB voltage is the supply voltage as this movement mainboard power supply management module of televisor, and as the power supply among Fig. 1+3.3_STB power supply, about 10 milliamperes of current sinkings only in full Core of TV set, when television boot-strap, + 3.3_STB voltage ratio 12V voltage powers on and wants fast a few tens of milliseconds, when turning off televisor 220V AC power, because+the 3.3_STB current loading is light, power down is slower more than 3 seconds than 12V voltage, at this moment adopts reset circuit shown in Figure 1 to go wrong.
Usually 5V voltage or the 3.3V voltage that each peripheral components is used in the movement all is to turn over different voltage conversion devices by this road of 12V voltage; therefore when the 12V power down to 0 the time; above-mentioned voltage all becomes 0; if at this moment+3.3_STB also would not do not have power down; then system can not reset; at this moment again the 12V electricity is supplied with movement; because each device is equivalent to not reset; and the core of working procedure and respectively need the register of operate as normal not to be initialized to the value of needs; will cause movement can not work on, be in " deadlock " state.
The generation reason of this fault is as follows usually: 1, user's start again of shutdown fast in 3 seconds makes televisor be in the deadlock state; 2, the unexpected power down of electrical network powers on rapidly again, and televisor is operate as normal again.Both of these case occurs now and then in the family; especially summer the 2nd kind of phenomenon often occur; summer, network load was big, cross conference sometimes and protect automatically, the user when seeing TV at home unexpected electric light black bright again then once; TV is directly shutdown then; no longer start also can't wake up with telepilot, has only manually with the TV ac dump; waited start again more than 5 seconds, just can recover normal.
People electrical reliability is required more and more higher today, for strengthening electrical reliability, improve the market competitiveness of electrical equipment, above-mentioned failure condition is necessary solution.
The utility model content
The purpose of this utility model is to provide a kind of voltage detecting circuit of reset circuit, to increase the reliability of existing reset circuit, avoids the failure because the power down mistiming of system voltage and standby voltage causes resetting.
Technical solutions of the utility model are:
A kind of voltage detecting circuit of reset circuit, comprise an electronic switch and a voltage stabilizing diode, the negative electrode of described voltage stabilizing diode connects a system power supply, anode connects first utmost point of described electronic switch and passes through one second resistance eutral grounding by one first resistance, second utmost point of described electronic switch connects a standby power by one the 3rd resistance, the 3rd utmost point of described electronic switch connects an end of one the 4th resistance, and the other end of described the 4th resistance is exported a chip reset signal as output terminal.
Described voltage detecting circuit, wherein, described electronic switch is the positive-negative-positive triode, its first, second and the 3rd utmost point be respectively base stage, emitter-base bandgap grading and collector.
Described voltage detecting circuit, wherein, the collector of described triode is also by one the 5th resistance eutral grounding.
Described voltage detecting circuit, wherein, the other end of described the 4th resistance is by a capacity earth.
Described voltage detecting circuit, wherein, described voltage detecting circuit also comprises a schottky diode, and the anode of described schottky diode connects the other end of the 4th resistance, and the general input and output pin that negative electrode connects a chip obtains a control signal.
Described voltage detecting circuit, wherein, control signal was a low level when described standby power worked independently.
The voltage detecting circuit of the reset circuit that the utility model better embodiment provides, can solve existing reset circuit in the standby power power down than the slow fault that is caused when a lot of of system power supply, circuit is simple, can detect current potential according to different situation regulation voltages, portable high, and adopted discrete component, performance-adjustable is good, cost is low, the reliability height.
Description of drawings
Fig. 1 is the circuit diagram of existing a kind of reset circuit;
Fig. 2 is the circuit diagram of the voltage detecting circuit of a kind of reset circuit of providing of the utility model better embodiment;
Fig. 3 is the circuit diagram after the voltage detecting circuit of the reset circuit that provides of the utility model better embodiment is applied to existing reset circuit.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
With reference to figure 2, the voltage detecting circuit of a kind of reset circuit that the utility model better embodiment provides, comprise a positive-negative-positive triode Q2 and a voltage stabilizing diode D3, the negative electrode of described voltage stabilizing diode D3 connects power supply+12V_ALL, anode connects the base stage B of triode Q2 by resistance R 5, the anode of described stabilivolt D3 is also by resistance R 6 ground connection, the emitter-base bandgap grading E of described triode Q2 connects power supply+3.3_STB by resistance R 7, output voltage source as this voltage detecting circuit, the collector C of described triode Q2 is by resistance R 8 ground connection, and by resistance R 9 pio chip reset signal MCURESET, for preventing the interference of the extremely short power down of power supply, pass through capacitor C 4 ground connection at chip reset signal MCURESET output terminal.
Described triode Q2 as other embodiment, also can adopt other electronic switch to replace as the output voltage switch of voltage detecting circuit.
In better embodiment of the present utility model, described voltage stabilizing diode D3 selects the stabilivolt of 5.6V for use, therefore, when above-mentioned voltage detecting circuit arrives 5.6+3.3-0.6=8.3V in power supply+12V_ALL power down, the emitter-base bandgap grading E of triode Q2 and collector C conducting, at this moment, because power supply+3.3_STB power down is slower than power supply+12V_ALL, chip reset signal MCURESET is a high level, chip reset.
The voltage detecting circuit that the utility model provides is as the slave part of reset circuit, enter under the ideal case in the electrical equipment operate as normal and to require to quit work, therefore, also need set up a schottky diode D4, the negative electrode of described schottky diode D4 is connected on the general input and output pin MCU GPIO of chip and obtains a control signal SAR1, anode is connected to the output terminal of chip reset signal MCURESET, in order to the effective time of control reset signal MCURESET, said chip is by+3.3_STB power supply, as long as+3.3_STB does not have power down, just can operate as normal.
Need to prove the control signal SAR1 that links schottky diode D4 negative electrode, its general input and output pin MCU GPIO from chip obtains, after power supply+12V_ALL powers on, chip moves that control signal SAR1 is a high level when normal, after complete machine was entered holding state, control signal SAR1 was that low spot is flat.
With reference to figure 3 are the reset circuits that increased behind the above-mentioned voltage detecting circuit, original reset circuit is described in background technology, when power supply+3.3_STB slower when a lot of than power supply+12V_ALL power down, the quick power down of power supply+12V_ALL powers on and can cause system's entanglement, can't reset and cause the fault that to start shooting, at this moment just can solve this fault by above-mentioned voltage detecting circuit.
The reset circuit principle of work that has increased behind the above-mentioned voltage detecting circuit is as follows: when power supply+12V_ALL and+3.3_STB all just often, triode Q2 is in cut-off state, cooperates original reset circuit, chip reset signal MCURESET is a low level.Behind ac dump in normal operation, when 5.6+3.3-0.6=8.3V is arrived in power supply+12V_ALL power down, the emitter-base bandgap grading E of triode Q2 and collector C conducting, if at this moment power supply+3.3_STB also exists, then control signal SAR1 is high, the collector C output high level of triode Q2, then chip reset signal MCURESET becomes height, chip enters reset mode, and power supply+3.3_STB does not have also that power supply+12V_ALL powers on again under the situation of power down then, then goes up behind 8.3V when powering on, triode Q2 ends, chip reset signal MCURESET becomes low level again, the releasing that resets, and then chip restarts and enters normal condition.
When requiring chip to enter holding state, described control signal SAR1 is a low level, at this moment power supply+12V_ALL is a low level, though the emitter-base bandgap grading E of triode Q2 and collector C conducting, but because control signal SAR1 is low, chip reset signal MCURESET is by the level of the clamper of schottky diode D4 to 0.3V, this is a low level for chip reset, then chip can not reset, even at this moment the high-speed switch machine needs only power supply+3.3_STB and does not become low level, all because above-mentioned clamping action, can not enter and reset, still be in holding state.Holding state enters open state, then again control signal SAR1 is drawn high, and enters the state of voltage detecting circuit running.
Reduce the susceptibility of voltage detecting circuits by capacitor C 4, can prevent unexpected power supply+12V_ALL power down spine, original chip can operate as normal, and causes the problem that resets owing to the reason of this voltage detecting circuit.
Above-mentioned voltage detecting circuit, can solve existing reset circuit in the standby power power down than the slow fault that is caused when a lot of of system power supply, circuit is simple, can detect current potential according to different situation regulation voltages, portable high, and adopted discrete component, performance-adjustable is good, cost is low, the reliability height.
Should be understood that; the above only is a better embodiment of the present utility model; not in order to limit protection domain of the present utility model; for those of ordinary skills; any modification of being done according to the above description, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (6)
1. the voltage detecting circuit of a reset circuit, it is characterized in that: described voltage detecting circuit comprises an electronic switch and a voltage stabilizing diode, the negative electrode of described voltage stabilizing diode connects a system power supply, anode connects first utmost point of described electronic switch and passes through one second resistance eutral grounding by one first resistance, second utmost point of described electronic switch connects a standby power by one the 3rd resistance, the 3rd utmost point of described electronic switch connects an end of one the 4th resistance, and the other end of described the 4th resistance is exported a chip reset signal as output terminal.
2. voltage detecting circuit according to claim 1 is characterized in that, described electronic switch is the positive-negative-positive triode, its first, second and the 3rd utmost point be respectively base stage, emitter-base bandgap grading and collector.
3. voltage detecting circuit according to claim 2 is characterized in that, the collector of described triode is also by one the 5th resistance eutral grounding.
4. voltage detecting circuit according to claim 1 is characterized in that, the other end of described the 4th resistance is by a capacity earth.
5. according to the described voltage detecting circuit of arbitrary claim in the claim 1 to 4, it is characterized in that, described voltage detecting circuit also comprises a schottky diode, the anode of described schottky diode connects the other end of the 4th resistance, and the general input and output pin that negative electrode connects a chip obtains a control signal.
6. voltage detecting circuit according to claim 5 is characterized in that, control signal was a low level when described standby power worked independently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202623745U CN201589807U (en) | 2009-12-31 | 2009-12-31 | Voltage detection circuit of reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202623745U CN201589807U (en) | 2009-12-31 | 2009-12-31 | Voltage detection circuit of reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201589807U true CN201589807U (en) | 2010-09-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2009202623745U Expired - Lifetime CN201589807U (en) | 2009-12-31 | 2009-12-31 | Voltage detection circuit of reset circuit |
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| CN (1) | CN201589807U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102291558A (en) * | 2011-08-24 | 2011-12-21 | 深圳创维－Rgb电子有限公司 | Television and resetting system thereof |
| CN102685995A (en) * | 2012-03-26 | 2012-09-19 | 上海信耀电子有限公司 | HID (High Intensity Discharge) ballast based on UC2843 chip |
| CN103092311A (en) * | 2013-01-25 | 2013-05-08 | 浪潮电子信息产业股份有限公司 | Design method for sharing input capacitance |
| CN103092299A (en) * | 2011-10-31 | 2013-05-08 | 成都高新区尼玛电子产品外观设计工作室 | Reset design circuit of system power on/off signal pin |
| CN103905756A (en) * | 2014-03-26 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Television set failure processing device and television set |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| US11010252B2 (en) | 2019-03-13 | 2021-05-18 | Hisense Visual Technology Co., Ltd. | Reset device and display device |
-
2009
- 2009-12-31 CN CN2009202623745U patent/CN201589807U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102081558A (en) * | 2011-01-24 | 2011-06-01 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102081558B (en) * | 2011-01-24 | 2013-05-22 | 北京北大千方科技有限公司 | Watchdog circuit in on-board unit and on-board unit |
| CN102291558A (en) * | 2011-08-24 | 2011-12-21 | 深圳创维－Rgb电子有限公司 | Television and resetting system thereof |
| CN102291558B (en) * | 2011-08-24 | 2013-05-08 | 深圳创维－Rgb电子有限公司 | Television and resetting system thereof |
| CN103092299A (en) * | 2011-10-31 | 2013-05-08 | 成都高新区尼玛电子产品外观设计工作室 | Reset design circuit of system power on/off signal pin |
| CN102685995A (en) * | 2012-03-26 | 2012-09-19 | 上海信耀电子有限公司 | HID (High Intensity Discharge) ballast based on UC2843 chip |
| CN103092311A (en) * | 2013-01-25 | 2013-05-08 | 浪潮电子信息产业股份有限公司 | Design method for sharing input capacitance |
| CN103905756A (en) * | 2014-03-26 | 2014-07-02 | 深圳创维－Rgb电子有限公司 | Television set failure processing device and television set |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| US11010252B2 (en) | 2019-03-13 | 2021-05-18 | Hisense Visual Technology Co., Ltd. | Reset device and display device |
| US11593214B2 (en) | 2019-03-13 | 2023-02-28 | Hisense Visual Technology Co., Ltd. | Reset device and display device |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100922 |
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| CX01 | Expiry of patent term |