CN201947164U - Resistor short circuit protection device - Google Patents
Resistor short circuit protection device Download PDFInfo
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- CN201947164U CN201947164U CN2010205750868U CN201020575086U CN201947164U CN 201947164 U CN201947164 U CN 201947164U CN 2010205750868 U CN2010205750868 U CN 2010205750868U CN 201020575086 U CN201020575086 U CN 201020575086U CN 201947164 U CN201947164 U CN 201947164U
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- protective device
- short circuit
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Abstract
The utility model relates to a resistor short circuit protection device which is connected with a switch power supply circuit through a power switch and a current detection resistor. The resistor short circuit protection device comprises a comparator, a first phase inverter, a latch counter, a main counter, a counting lock/start logic control circuit and a second inverter which are electrically connected with one another. The digital logic of the resistor short circuit protection device is initiated by using a power-on reset signal, the latch counter and the main counter are made to be in the reset state, the output of the resistor short circuit protection device is made to be at high level, the power switch is switched on, the voltage of the current detection resistor is detected to judge that whether the voltage of the current detection resistor exceeds the threshold voltage in consecutive M clock periods, if the voltage of the current detection resistor exceeds the threshold voltage, no short circuit occurs, and otherwise, the short circuit occurs, the output of the resistor short circuit protection device is made to be at low level, and the power switch is switched off. The resistor short circuit protection device is stable and reliable, can be automatically restarted, has high disturbance resisting capacity and is free from endless loop.
Description
Technical field
The utility model relates to a kind of resistive short protective device.
Background technology
Switching power converters is widely used in Industry Control, network, communication and various electronic equipment for consumption because of the high advantage of its conversion efficiency.Divide from the feedback controling mode of power-supply system, Switching Power Supply can be divided into constant voltage control mode Switching Power Supply and constant current control switching.The constant current control mode has obtained increasing attention with its rapid dynamic response speed, characteristics such as adjusting function is good, the overshoot voltage amplitude is little, the stability of a system is good.
For the Switching Power Supply of a constant current control mode, generally need be with load current as detection signal input switch power-supply controller of electric.The detection of load current generally realizes by the mode of resistance.This detects resistance may bring short circuit because of the error welding, and the resistive short protection can prevent to bring power-supply system to suffer permanent damage because of resistive short.
Usually, on a lot of switch power controllers, do not design the resistive short protection module and protect power-supply system.Perhaps, some power-supply controller of electric only adopt simple comparator, by a threshold voltage is set, the voltage on the current sense resistor and this threshold voltage is compared realize simple resistive short protection.Such protection makes the power-supply system poor anti jamming capability.The generation of some non-ideal conditions can make the accident of power-supply system close.
Fig. 1 is the inverse-excitation type switch power-supply converter 100 that comprises the resistance protection circuit of a simplification.The inverse-excitation type switch power-supply converter comprises: elementary winding 110, secondary winding 111, auxiliary winding 112, power switch 130; current sense resistor 131, error amplifier 140, comparator 141, oscillator 142; logical one 43, resistive short protection 144, power tube drives 145.
When switching power converters normally moved, converter was divided into two stages.Phase I: elementary winding 110(also can be described as inductive winding, Transformer Winding) the energy storage stage; Second stage: energy transfer process.In the phase I, 130 conductings of SW power controlling switch, the voltage VDC of coil 110 anodes is to elementary winding 110 energy storage, and the electric current that flows through elementary winding 110 increases, and this electric current equates with the electric current that flows through resistance 131.At this moment, flowing through electric current in the secondary winding 111 is zero, ends with secondary winding diode in series 120.In second stage, SW power controlling switch 130 disconnects.The energy that is stored in the elementary winding 110 is transferred to secondary winding 111 by transformer, makes diode 120 open.Energy supply load 122 and being stored in the electric capacity in parallel 121 with load.Phase I and second stage constitute a change-over period.Converter is transformed into the inherent FEEDBACK CONTROL of second stage by converter from the phase I.Particularly, the voltage VS on current sense resistor reaches output voltage error amplifier VEA, handles through PWM comparator and subsequent logic, and converter enters second stage by the phase I.Yet under abnormal condition, because the current detecting short circuit, voltage VS is in than low value always, can not reach voltage VEA, can make supply convertor be in the phase I always.Its direct result is that the electric current that flows through transformer is increasing, causes the permanent damages of power-supply system.Yet; as shown in Figure 2; existing resistive short protection; adopt comparator 201; current detection signal voltage VS and threshold voltage vt h are compared,, close power switch by logic control 202 and gate driving 203 in case be lower than voltage Vth at predetermined instant voltage VS; prevent that electric current from further increasing, prevent the permanent lesion of power-supply system.But this simply by the comparator judgement, it is disconnected erroneous judgement to occur.Particularly, during power-supply system initially powered on, power module needed correct foundation, did not have short circuit even detect resistance, also can cause erroneous judgement.And the protection of this resistive short needs the people just may make the power supply operate as normal for restarting power-supply system after the erroneous judgement broken hair is given birth to.Such guard method has poor stability, the drawback that reliability is low.
In sum, be necessary to design a kind of resistive short protected mode of more optimizing to address the above problem.
The utility model content
A kind of resistive short protective device that the utility model provides provides a kind of reliable and stable, the resistive short protective device that can restart automatically, and there is not endless loop in strong interference immunity.
In order to achieve the above object; the utility model provides a kind of resistive short protective device; this protective device inserts switching power circuit by power switch and current sense resistor, and this protective device comprises comparator, first inverter that circuit connects, latchs counter, basic counter, counting locking/enable logic control circuit and second inverter.
Described counting locking/enable logic control circuit comprise first with the door and second and.
Described comparator be input as detection voltage and a direct current threshold voltage on the current sense resistor, this both comparative result is as latching one of set/reset signal of counter.
The described counter that latchs comprises the input clock processing logic module that circuit connects, trigger 1, trigger 2 ... trigger M.
First of described counting locking/enable logic control circuit comprises three the tunnel with door and imports: power-on reset signal, the output of comparator and the output of basic counter.
Described basic counter comprises trigger 1, trigger 2 ... trigger N.
When electrification reset is a low level, under logic control, latch counter and basic counter is in reset mode, the protection of protective device is output as high level, and think that short-circuit conditions does not take place this moment, so that chip normally starts.When electrification reset is a high level, resistive short protective device operate as normal.When the voltage that detects voltage input end during greater than threshold voltage, trigger and latch counter reset, the protection of protective device is output as high level, and think that short-circuit conditions does not take place this moment, and simultaneously, basic counter resets.An if continuous N clock cycle; the voltage that detects voltage input end is lower than threshold voltage; then latch counter and can count down to count status M; latch counter lock and fix on count status M, the protection of protective device is output as low level, thinks that short-circuit conditions takes place this moment; simultaneously; basic counter begins counting, when basic counter count down to count status, resets once more and latchs counter.
Advantage of the present utility model is: on the one hand, can be by the count cycle M that latchs counter be set flexibly, if a continuous N cycle, the detection voltage on the current sense resistor does not surpass setting threshold, is resistive short, has good anti-interference; On the other hand, by adopting basic counter, there is not the endless loop state in this device, when the erroneous judgement of generation resistive short is disconnected, does not need the cold start-up power-supply system.
Description of drawings
Fig. 1 is an inverse-excitation type switch power-supply converter schematic diagram in the background technology.
Fig. 2 is an existing resistive short protective circuit in the background technology.
Fig. 3 is the electrical block diagram of the resistive short protective device that provides of the utility model.
Fig. 4～Fig. 6 is the structural representation of comparator in the utility model.
Fig. 7 is the structural representation that latchs counter in the utility model.
Fig. 8 is the structural representation of basic counter in the utility model.
Fig. 9 is the input and output oscillogram of the resistive short protective device that provides of the utility model.
Embodiment
Following according to Fig. 3～Fig. 9, specify preferred embodiment of the present utility model:
As shown in Figure 3; it is the structural representation of the circuit of resistive short protective device; this protective device inserts switching power circuits by power switch 130 and current sense resistor 131, and this protective device comprises comparator 401, first inverter 402 that circuit connects, latchs counter 405, basic counter 406, counting locking/enable logic control circuit and second inverter 407.
Described counting locking/enable logic control circuit comprise first with door 403 and second and 404.
As shown in Figure 4, a kind of embodiment for comparator, among this embodiment, comparator 401 comprises: the first transistor M1 of comparator currents source M0, two common-source stages being connected with comparator currents source M0 drain electrode and transistor seconds M2 and the 3rd transistor M3 and the 4th transistor M4, the 3rd transistor M3 and the 4th transistor M4 common gate that are connected with transistor seconds M2 with the first transistor M1 respectively.
As shown in Figure 5, two kinds of embodiment for comparator, among this embodiment, comparator 401 comprises: the first transistor M1 of comparator currents source M0, two common-source stages being connected with comparator currents source M0 drain electrode and transistor seconds M2 and the 3rd transistor M3 and the 4th transistor M4 that are connected with transistor seconds M2 with the first transistor M1 respectively.
As shown in Figure 6, three kinds of embodiment for comparator, the first transistor M1 of two common-source stages that among this embodiment, comparator 401 comprises comparator currents source M0, be connected with comparator currents source M0 drain electrode and transistor seconds M2 and first resistance R 1 and second resistance R 2 that are connected with transistor seconds M2 with the first transistor M1 respectively.
Described comparator 401 be input as detection voltage and a direct current threshold voltage vt h on the current sense resistor 131, this both comparative result is as latching one of set/reset signal of counter.
As shown in Figure 7, the described counter 405 that latchs comprises the input clock processing logic module 4051 that circuit connects, trigger 1, trigger 2 ... trigger M.
When the set/reset end is low level, all trigger zero clearings, input clock processing logic module is enabled, and input clock can begin counting by the driven trigger.Finish 1 when latching counter, 2 ... the counting of M, also be, when counting down to the count status M that presets, input clock processing logic module is locked, latching counter can be at count status " M " constantly, and lock count state, set/reset signal make that latching counter enters initial state counting " 1 ".If latch counter the counting process of finishing from " 1 " to " M ", there is not the set/reset signal triggering, latching counter can be at count status " M " constantly, the lock count state.After the set/reset signal triggers once more, latch counter and begin the new count cycle once more.
First of described counting locking/enable logic control circuit comprises three the tunnel with door 403 and imports: power-on reset signal, comparator 401 is through the output of first inverter 402 and the output of basic counter 406, any one road signal in three road signals is a low level, then trigger set/reset, will make that latching counter 405 carries out set/reset.Simultaneously, the output of latching counter 405 can make basic counter 406 reset.If the count status that latchs counter 405 does not reach the state of the art M of setting, then basic counter 406 is in reset mode always.
As shown in Figure 8, described basic counter 406 comprises trigger 1, trigger 2 ... trigger N.When the set/reset end is a low level, all trigger zero clearings.When the set/reset end is a high level, under the driving of input clock, counter begins counting.
Described basic counter 406 finishes 1,2 ... the counting of N.Latching counter 405 when being in count status, basic counter 406 is in the count resets state.Be in counting during lock-out state when latching counter 405, basic counter 406 is in count status.The output of basic counter 406 is as latching one of set/reset signal of counter 405.
As shown in Figure 3, when electrification reset is a low level, under logic control, latch counter 405 and basic counter 406 is in reset mode, the protection of protective device is output as high level, and think that short-circuit conditions does not take place this moment, so that chip normally starts.When electrification reset is a high level, resistive short protective device operate as normal.When the voltage that detects voltage input end during greater than threshold voltage, trigger and latch counter 405 and reset, the protection of protective device is output as high level, and think that short-circuit conditions does not take place this moment, and simultaneously, basic counter 406 resets.An if continuous N clock cycle; the voltage that detects voltage input end is lower than threshold voltage; then latch counter 405 and can count down to count status M; latch counter 405 and be locked in count status M, the protection of protective device is output as low level, thinks that short-circuit conditions takes place this moment; simultaneously; basic counter 406 begins counting, when basic counter 406 count down to count status N, resets once more and latchs counter 405.
The waveform of power-on reset signal, threshold voltage, detection voltage, protection output as shown in Figure 9.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.After those skilled in the art have read foregoing, for multiple modification of the present utility model with to substitute all will be conspicuous.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (6)
1. resistive short protective device, this protective device inserts switching power circuit by power switch (130) and current sense resistor (131), it is characterized in that this protective device comprises comparator (401), first inverter (402) that circuit connects, latchs counter (405), basic counter (406), counting locking/enable logic control circuit and second inverter (407);
Described counting locking/enable logic control circuit comprise first with door (403) and second and (404);
Described comparator (401) be input as a detection voltage and a direct current threshold voltage (Vth) on the current sense resistor (131), this both comparative result is as latching one of set/reset signal of counter;
First of described counting locking/enable logic control circuit comprises three the tunnel with door (403) and imports: power-on reset signal, the output of the output of comparator (401) and basic counter (406).
2. resistive short protective device as claimed in claim 1; it is characterized in that; described comparator (401) comprises: comparator currents source (M0), with the first transistor (M1) of two common-source stages being connected of comparator currents source (M0) drain electrode and transistor seconds (M2) and the 3rd transistor (M3) and the 4th transistor (M4), the 3rd transistor (M3) and the 4th transistor (M4) common gate that are connected with transistor seconds (M2) with the first transistor (M1) respectively.
3. resistive short protective device as claimed in claim 1; it is characterized in that described comparator (401) comprises: comparator currents source (M0), with the first transistor (M1) of two common-source stages being connected of comparator currents source (M0) drain electrode and transistor seconds (M2) and the 3rd transistor (M3) and the 4th transistor (M4) that are connected with transistor seconds (M2) with the first transistor (M1) respectively.
4. resistive short protective device as claimed in claim 1; it is characterized in that, described comparator (401) comprise comparator currents source (M0), with the first transistor (M1) of two common-source stages being connected of comparator currents source (M0) drain electrode and transistor seconds (M2) and first resistance (R1) and second resistance (R2) that are connected with transistor seconds (M2) with the first transistor (M1) respectively.
5. resistive short protective device as claimed in claim 1 is characterized in that, the described counter (405) that latchs comprises the input clock processing logic module (4051) that circuit connects, trigger (1), trigger (2) ... trigger (M).
6. resistive short protective device as claimed in claim 1 is characterized in that, described basic counter (406) comprises trigger (1), trigger (2) ... trigger (N).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750868U CN201947164U (en) | 2010-10-25 | 2010-10-25 | Resistor short circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205750868U CN201947164U (en) | 2010-10-25 | 2010-10-25 | Resistor short circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201947164U true CN201947164U (en) | 2011-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205750868U Expired - Lifetime CN201947164U (en) | 2010-10-25 | 2010-10-25 | Resistor short circuit protection device |
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| Country | Link |
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| CN (1) | CN201947164U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969188A (en) * | 2010-10-25 | 2011-02-09 | 灿芯半导体(上海)有限公司 | Resistor short-circuit protective device and protective method used for switching power supply |
| CN104158143A (en) * | 2013-05-14 | 2014-11-19 | 鸿富锦精密电子(天津)有限公司 | Fan protection circuit |
| CN108932408A (en) * | 2018-08-03 | 2018-12-04 | 广东工业大学 | A kind of enable signal control circuit and a kind of chip |
| CN110596517A (en) * | 2019-09-23 | 2019-12-20 | 晶艺半导体有限公司 | Short circuit detection circuit and detection method |
| WO2021078562A1 (en) * | 2019-10-22 | 2021-04-29 | Signify Holding B.V. | Led driver and lighting system using the same |
-
2010
- 2010-10-25 CN CN2010205750868U patent/CN201947164U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969188A (en) * | 2010-10-25 | 2011-02-09 | 灿芯半导体(上海)有限公司 | Resistor short-circuit protective device and protective method used for switching power supply |
| CN101969188B (en) * | 2010-10-25 | 2013-08-21 | 灿芯半导体(上海)有限公司 | Resistor short-circuit protective device and protective method used for switching power supply |
| CN104158143A (en) * | 2013-05-14 | 2014-11-19 | 鸿富锦精密电子(天津)有限公司 | Fan protection circuit |
| CN108932408A (en) * | 2018-08-03 | 2018-12-04 | 广东工业大学 | A kind of enable signal control circuit and a kind of chip |
| CN108932408B (en) * | 2018-08-03 | 2022-06-24 | 广东工业大学 | Enabling signal control circuit and chip |
| CN110596517A (en) * | 2019-09-23 | 2019-12-20 | 晶艺半导体有限公司 | Short circuit detection circuit and detection method |
| CN110596517B (en) * | 2019-09-23 | 2021-09-24 | 晶艺半导体有限公司 | Short circuit detection circuit and detection method |
| WO2021078562A1 (en) * | 2019-10-22 | 2021-04-29 | Signify Holding B.V. | Led driver and lighting system using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110824 Effective date of abandoning: 20130821 |
|
| RGAV | Abandon patent right to avoid regrant |