CN201994627U - Control circuit with multifunctional power-control chip pin and detecting circuit - Google Patents
Control circuit with multifunctional power-control chip pin and detecting circuit Download PDFInfo
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- CN201994627U CN201994627U CN2010201875807U CN201020187580U CN201994627U CN 201994627 U CN201994627 U CN 201994627U CN 2010201875807 U CN2010201875807 U CN 2010201875807U CN 201020187580 U CN201020187580 U CN 201020187580U CN 201994627 U CN201994627 U CN 201994627U
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Abstract
The utility model discloses a control circuit with a multifunctional power-control chip pin and a detecting circuit. The control circuit comprises an enabling/disabling switch, a Zener diode, a thermistor with a negative temperature coefficient, and a current source, which are all connected with the pin. The voltage of the pin can have different voltage values with the changes of a system and an environment, the detecting circuit is used for monitoring the voltage of the pin, and a disabling signal, an overvoltage signal or an overtemperature signal are triggered accordingly so as to reduce standby energy consumption and realize the function of overvoltage and overtemperature protection.
Description
Technical field
The utility model relates to a kind of power supply control chip (power control integrated circuit), particularly about a kind of control circuit and circuit for detecting of integrating multiple function in a power supply control chip pin.
Background technology
In recent years, because of energy crisis and environmental protection notion new line, various countries remove the new alternative energy source of active development, and the conversion efficiency of strict regulations electrical equipment and unloaded standby energy consumption.In addition, aspect system protection, need also to require the complete defencive function of tool, to improve the fail safe of system, this means that power supply control chip need increase extra pin and come the supportive protection function, causes the increase of power supply control chip packaging cost.Fig. 1 is the power supply control chip under the existing framework, its first pin is activation/forbidden energy pin EN/DIS, change between activation/forbidden energy (enable/disable) pattern in order to the control whole system, this control chip of forbidden energy is to reduce standby energy consumption when system's zero load.If will add defencive functions such as overvoltage and excess temperature, then control chip needs the extra protection pin PRO that increases, and so will make chip become ten branch connecting pins from eight branch connecting pins, thereby need to use bigger encapsulation, increases the system cost expenditure.Therefore, reach as how limited pin count and reduce standby energy consumption and the supportive protection function is a key technology.
The utility model content
One of the purpose of this utility model is to propose a kind of control circuit and circuit for detecting of integrating multiple function in a power supply control chip pin.
According to the utility model, a kind ofly integrate multiple function and comprise in the control circuit of a power supply control chip pin: one activation/forbidden energy switch is connected between this pin and one first voltage end; One zener diode is reverse to be connected between a voltage source and this pin, and it has a breakdown voltage; One first resistance and this zener diode are series between this pin and this voltage source; One thermistor is connected between this pin and one second voltage end, and it has a negative temperature coefficient; One current source connects this pin; And one circuit for detecting connect this pin, its voltage of monitoring this pin is to trigger disable signal, overvoltage signal or excess temperature signal.
Preferably, this activation/forbidden energy switch comprises a transistor.
Preferably, this first voltage end is an earth terminal.
This second voltage end is an earth terminal.Preferably, this control circuit comprises that more one second resistance and this thermistor are series between this pin and this second voltage end.
Preferably, this second voltage end is an earth terminal.
Preferably, this current source comprises a constant current source.
Preferably, this current source is in the inside of this power supply control chip.
Preferably, this current source is in the outside of this power supply control chip.
Preferably, this circuit for detecting comprises: first comparator is the voltage and the first voltage threshold value of this pin relatively, to produce this disable signal; Second comparator is the voltage and the second voltage threshold value of this pin relatively, to produce this overvoltage signal; And the 3rd the comparator relatively voltage and the tertiary voltage threshold value of this pin, to produce this excess temperature signal.
Preferably, this circuit for detecting comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
Preferably, this circuit for detecting comprises that more a logic lock produces a block signal in response to this overvoltage signal.
Preferably, this circuit for detecting comprises that a more anti-surging pulser connects this second comparator, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again.
Preferably, this circuit for detecting comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
Preferably, this circuit for detecting comprises that more a logic lock produces a block signal in response to this excess temperature signal.
Preferably, this circuit for detecting comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
Preferably, this circuit for detecting comprises that more a logic lock connects this delayer, to produce a block signal.
In addition, the utility model also provides a kind of circuit for detecting of integrating multiple function in a power supply control chip pin, and comprising: first comparator connects this pin, and relatively the voltage of this pin and the first voltage threshold value trigger a disable signal according to this; Second comparator connects this pin, and relatively the voltage of this pin and the second voltage threshold value trigger an overvoltage signal according to this; And the 3rd comparator connect this pin, relatively the voltage of this pin and tertiary voltage threshold value trigger an excess temperature signal according to this.
Preferably, this circuit for detecting comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
Preferably, this circuit for detecting comprises that more a logic lock produces a block signal in response to this overvoltage signal.
Preferably, comprise that a more anti-surging pulser connects this second comparator, continue one section anti-surging at this overvoltage signal and discharge this overvoltage signal after the burst length again.
Preferably, comprise that more a logic lock connects this anti-surging pulser, to produce a block signal.
Preferably, this circuit for detecting comprises that more a logic lock produces a block signal in response to this excess temperature signal.
Preferably, this circuit for detecting comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
Preferably, comprise that more a logic lock connects this delayer, to produce a block signal.
Power supply control chip of the present utility model; it need not to increase in addition the protection pin; only use original activation/forbidden energy pin EN/DIS can support activation/forbidden energy pattern and defencive functions such as overvoltage and excess temperature; thereby need not to use bigger encapsulation; can reduce the packaging cost of this power supply control chip, promote competitiveness.
Description of drawings
Fig. 1 is the power supply control chip under the existing framework;
Fig. 2 is according to power supply control chip of the present utility model; And
Fig. 3 is the embodiment according to control circuit of the present utility model.
Embodiment
Below in conjunction with Figure of description embodiment of the present utility model is done detailed description.
Fig. 2 is according to power supply control chip of the present utility model; it need not to increase in addition the protection pin; only use original activation/forbidden energy pin EN/DIS can support activation/forbidden energy pattern and defencive functions such as overvoltage and excess temperature; thereby need not to use bigger encapsulation; can reduce the packaging cost of this power supply control chip, promote competitiveness.
Control circuit with multifunctional power control chip pin described in the utility model comprises: one activation/forbidden energy switch is connected between this pin and one first voltage end; One zener diode is reverse to be connected between a voltage source and this pin, and it has a breakdown voltage; One first resistance and this zener diode are series between this pin and this voltage source; One thermistor is connected between this pin and one second voltage end, and it has a negative temperature coefficient; One current source connects this pin; And one circuit for detecting connect this pin, its voltage of monitoring this pin is to trigger disable signal, overvoltage signal or excess temperature signal.
Further, this activation/forbidden energy switch comprises a transistor.
Further, this first voltage end is an earth terminal.
Further, this second voltage end is an earth terminal.
Further, described control circuit comprises that more one second resistance and this thermistor are series between this pin and this second voltage end.
Further, this second voltage end is an earth terminal.
Further, this current source comprises a constant current source.
Further, this current source is in the inside of this power supply control chip.
Further, this current source is in the outside of this power supply control chip.
Further, this circuit for detecting comprises:
First comparator is the voltage and the first voltage threshold value of this pin relatively, to produce this disable signal;
Second comparator is the voltage and the second voltage threshold value of this pin relatively, to produce this overvoltage signal; And
The 3rd comparator is the voltage and the tertiary voltage threshold value of this pin relatively, to produce this excess temperature signal.
Further, this circuit for detecting comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
Further, this circuit for detecting comprises that more a logic lock produces a block signal in response to this overvoltage signal.
Further, this circuit for detecting comprises that a more anti-surging pulser connects this second comparator, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again.
Further, this circuit for detecting comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
Further, this circuit for detecting comprises that more a logic lock produces a block signal in response to this excess temperature signal.
Further, this circuit for detecting comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
Further, this circuit for detecting comprises that more a logic lock connects this delayer, to produce a block signal.
The multiple function of integration described in the utility model comprises in the circuit for detecting of a power supply control chip pin:
First comparator connects this pin, and relatively the voltage of this pin and the first voltage threshold value trigger a disable signal according to this;
Second comparator connects this pin, and relatively the voltage of this pin and the second voltage threshold value trigger an overvoltage signal according to this; And
The 3rd comparator connects this pin, and relatively the voltage of this pin and tertiary voltage threshold value trigger an excess temperature signal according to this.
Further, described circuit for detecting comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
Further, described circuit for detecting comprises that more a logic lock produces a block signal in response to this overvoltage signal.
Further, described circuit for detecting comprises that a more anti-surging pulser connects this second comparator, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again.
Further, described circuit for detecting comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
Further, described circuit for detecting comprises that more a logic lock produces a block signal in response to this excess temperature signal.
Further, described circuit for detecting comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
Further, described circuit for detecting comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
Fig. 3 is the embodiment according to control circuit of the present utility model, and it is integrated into protected mode the activation/forbidden energy pin EN/DIS of control chip.This embodiment utilizes an optical coupler (optocoupler) 10, to check to receive (Zener, claim Zener again) diode D2, a negative tempperature coefficient thermistor (NTC) 12 and two resistance R 1, R2, be connected in pin EN/DIS in the control chip outside, provide current source 14 by control chip inside again, and detect the voltage of pin EN/DIS by circuit for detecting 16.Utilize the comparator 18,20,22 in the circuit for detecting 16, can provide and reduce idling consumption and defencive functions such as overvoltage and excess temperature.Optical coupler 10 comprises transistor Q1 and is used as activation/forbidden energy switch and is connected between a pin EN/DIS and the voltage end, and in this embodiment, this voltage end is an earth terminal.When system's normal operation, the transistor Q1 of optical coupler 10 ends, zener diode D2 can't conducting because of contrary be connected between power end VDD and the pin EN/DIS, and resistance R 1 and zener diode D2 are series between pin EN/DIS and the voltage source V DD and flow to pin EN/DIS to limit electric current from power end VDD.Thermistor 12 with negative temperature coefficient is connected between a pin EN/DIS and the voltage end, and the preferably comprises that more resistance R 2 and thermistor 12 are series between pin EN/DIS and this voltage end, and in this embodiment, this voltage end is an earth terminal.Current source 14 connects pin EN/DIS, the preferably, and current source 14 is constant current sources.The electric current I that current source 14 provides flow through resistance R 2 and thermistor 12, thereby produce voltage at pin EN/DIS.When system is unloaded, the light-emitting diode D1 turn-on transistor Q1 in the optical coupler 10 and voltage of pin EN/DIS is dragged down, the voltage that this moment, comparator 18 detected pin EN/DIS is lower than voltage threshold value VDisable and triggers disable signal.The preferably more comprises anti-surging pulse (deglitch) device 24 and stops this disable signal earlier, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again, judges to prevent the surging influence that comparator 18 produces.Disable signal makes control chip enter the forbidden energy pattern to reduce standby energy consumption.When the voltage of power end VDD was higher than the breakdown voltage of zener diode D2, zener diode D2 collapse made the voltage of pin EN/DIS rise, and the voltage that this moment, comparator 20 detected pin EN/DIS is higher than voltage threshold value V
OVPAnd the triggering overvoltage signal.The preferably more comprises anti-surging pulser 26 and stops this overvoltage signal earlier, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again, judges to prevent the surging influence that comparator 20 produces.When occurrence temperature was too high, because thermistor 12 has negative temperature coefficient, its resistance value Yin Wendu rose and reduces, and then the voltage of pin EN/DIS is descended, and the voltage that detects pin EN/DIS when comparator 22 is lower than voltage threshold value V
OTPThe time just trigger the excess temperature signal.The preferably more comprises delay (delay) device 28 and stops this excess temperature signal earlier, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.The preferably more comprises the logic lock and produces block signal in response to overvoltage signal or excess temperature signal.In this embodiment; this logic lock is or door 30; it produces block signal when overvoltage signal or excess temperature signal are arranged; make control chip enter the locking pattern; after this need user's restarting systems; or reset automatically by the own timing of chip, just can make control chip break away from the locking pattern, thereby reach overvoltage and excess current protective function control chip.In other embodiments, current source 14 also can be arranged on the outside of control chip, in the same manner described above running.
More than; it only is preferred embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claim was defined.
Claims (25)
1. the control circuit of a tool multifunctional power control chip pin is characterized in that, comprising:
One activation/forbidden energy switch is connected between this pin and one first voltage end;
One zener diode is reverse to be connected between a voltage source and this pin, and it has a breakdown voltage;
One first resistance and this zener diode are series between this pin and this voltage source;
One thermistor is connected between this pin and one second voltage end, and it has a negative temperature coefficient;
One current source connects this pin; And
One circuit for detecting connects this pin, and its voltage of monitoring this pin is to trigger disable signal, overvoltage signal or excess temperature signal.
2. control circuit as claimed in claim 1 is characterized in that, this activation/forbidden energy switch comprises a transistor.
3. control circuit as claimed in claim 1 is characterized in that, this first voltage end is an earth terminal.
4. control circuit as claimed in claim 1 is characterized in that, this second voltage end is an earth terminal.
5. control circuit as claimed in claim 1 comprises that more one second resistance and this thermistor are series between this pin and this second voltage end.
6. control circuit as claimed in claim 5 is characterized in that, this second voltage end is an earth terminal.
7. control circuit as claimed in claim 1 is characterized in that this current source comprises a constant current source.
8. control circuit as claimed in claim 1 is characterized in that this current source is in the inside of this power supply control chip.
9. control circuit as claimed in claim 1 is characterized in that this current source is in the outside of this power supply control chip.
10. control circuit as claimed in claim 1 is characterized in that, this circuit for detecting comprises:
First comparator is the voltage and the first voltage threshold value of this pin relatively, to produce this disable signal;
Second comparator is the voltage and the second voltage threshold value of this pin relatively, to produce this overvoltage signal; And
The 3rd comparator is the voltage and the tertiary voltage threshold value of this pin relatively, to produce this excess temperature signal.
11. control circuit as claimed in claim 10 is characterized in that, this circuit for detecting comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
12. control circuit as claimed in claim 10 is characterized in that, this circuit for detecting comprises that more a logic lock produces a block signal in response to this overvoltage signal.
13. control circuit as claimed in claim 10 is characterized in that, this circuit for detecting comprises that a more anti-surging pulser connects this second comparator, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again.
14. control circuit as claimed in claim 13 is characterized in that, this circuit for detecting comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
15. control circuit as claimed in claim 10 is characterized in that, this circuit for detecting comprises that more a logic lock produces a block signal in response to this excess temperature signal.
16. control circuit as claimed in claim 10 is characterized in that, this circuit for detecting comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
17. control circuit as claimed in claim 16 is characterized in that, this circuit for detecting comprises that more a logic lock connects this delayer, to produce a block signal.
18. integrate multiple function in the circuit for detecting of a power supply control chip pin for one kind, it is characterized in that, comprising:
First comparator connects this pin, and relatively the voltage of this pin and the first voltage threshold value trigger a disable signal according to this;
Second comparator connects this pin, and relatively the voltage of this pin and the second voltage threshold value trigger an overvoltage signal according to this; And
The 3rd comparator connects this pin, and relatively the voltage of this pin and tertiary voltage threshold value trigger an excess temperature signal according to this.
19. circuit for detecting as claimed in claim 18 is characterized in that, comprises that a more anti-surging pulser connects this first comparator, continues one section anti-surging in this disable signal and discharges this disable signal after the burst length again.
20. circuit for detecting as claimed in claim 18 is characterized in that, comprises that more a logic lock produces a block signal in response to this overvoltage signal.
21. circuit for detecting as claimed in claim 18 is characterized in that, comprises that a more anti-surging pulser connects this second comparator, continues one section anti-surging at this overvoltage signal and discharges this overvoltage signal after the burst length again.
22. circuit for detecting as claimed in claim 21 is characterized in that, comprises that more a logic lock connects this anti-surging pulser, to produce a block signal.
23. circuit for detecting as claimed in claim 18 is characterized in that, comprises that more a logic lock produces a block signal in response to this excess temperature signal.
24. circuit for detecting as claimed in claim 18 is characterized in that, comprises that more a delayer connects the 3rd comparator, continues to discharge this excess temperature signal again after one period time of delay at this excess temperature signal.
25. circuit for detecting as claimed in claim 24 is characterized in that, comprises that more a logic lock connects this delayer, to produce a block signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201875807U CN201994627U (en) | 2010-12-23 | 2010-12-23 | Control circuit with multifunctional power-control chip pin and detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201875807U CN201994627U (en) | 2010-12-23 | 2010-12-23 | Control circuit with multifunctional power-control chip pin and detecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201994627U true CN201994627U (en) | 2011-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201875807U Expired - Fee Related CN201994627U (en) | 2010-12-23 | 2010-12-23 | Control circuit with multifunctional power-control chip pin and detecting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635669A (en) * | 2019-11-14 | 2019-12-31 | 南京大学 | High-voltage MOSFET switch driving and protecting circuit |
| CN110987223A (en) * | 2019-11-27 | 2020-04-10 | 山东航天电子技术研究所 | Improved high-precision platinum resistor temperature measuring circuit |
| CN117254682A (en) * | 2023-11-20 | 2023-12-19 | 成都芯翼科技有限公司 | Anti-interference voltage conversion circuit |
-
2010
- 2010-12-23 CN CN2010201875807U patent/CN201994627U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635669A (en) * | 2019-11-14 | 2019-12-31 | 南京大学 | High-voltage MOSFET switch driving and protecting circuit |
| CN110987223A (en) * | 2019-11-27 | 2020-04-10 | 山东航天电子技术研究所 | Improved high-precision platinum resistor temperature measuring circuit |
| CN110987223B (en) * | 2019-11-27 | 2021-03-16 | 山东航天电子技术研究所 | Improved high-precision platinum resistor temperature measuring circuit |
| CN117254682A (en) * | 2023-11-20 | 2023-12-19 | 成都芯翼科技有限公司 | Anti-interference voltage conversion circuit |
| CN117254682B (en) * | 2023-11-20 | 2024-03-12 | 成都芯翼科技有限公司 | Anti-interference voltage conversion circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110928 Termination date: 20141223 |
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| EXPY | Termination of patent right or utility model |