CN106645892B - Overvoltage detection circuit - Google Patents
Overvoltage detection circuit Download PDFInfo
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- CN106645892B CN106645892B CN201610814788.9A CN201610814788A CN106645892B CN 106645892 B CN106645892 B CN 106645892B CN 201610814788 A CN201610814788 A CN 201610814788A CN 106645892 B CN106645892 B CN 106645892B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/1659—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 to indicate that the value is within or outside a predetermined range of values (window)
Abstract
The embodiment of the invention discloses an overvoltage detection circuit, which comprises: the circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded; the voltage regulator further comprises a third resistor and a controllable precise voltage-stabilizing source, wherein one end of the third resistor is connected with the voltage output end, the other end of the third resistor is connected with the cathode of the controllable precise voltage-stabilizing source, the anode of the controllable precise voltage-stabilizing source is grounded, and the reference electrode of the controllable precise voltage-stabilizing source is connected with the connecting end of the first resistor and the second resistor; the input end of the optical coupler is connected with the optical coupler connected with the third resistor in parallel, the cathode of the optical coupler is connected with the cathode of the controllable precise voltage stabilizing source, the emitting electrode of the optical coupler is grounded, and the collecting electrode of the optical coupler is connected with the Latch port of the power management chip. The overvoltage detection circuit can set lower open-loop detection voltage, and avoid damaging devices in the circuit, thereby improving the reliability of the circuit.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an overvoltage detection circuit.
Background
The open-loop detection function is added in most flyback switching power supply circuits, the principle is that the secondary voltage rises when the loop is opened, the voltage of the auxiliary winding also rises accordingly, and then the secondary voltage can be detected by detecting the voltage of the auxiliary winding, so that the open-loop state is detected. As shown in fig. 1, a conventional open-loop detection circuit is provided, wherein an auxiliary winding voltage is input to a VCC terminal of a power management chip, and when the voltage at the VCC terminal exceeds a certain value, a voltage of a Latch pin is reduced to turn off a power supply. In this method, there may be a malfunction that the secondary voltage is increased due to an increase in the load to turn off the power supply, which may cause the flyback switching power supply to need to set a higher detection voltage during open loop detection, but the setting of the higher detection voltage may damage devices in the circuit, thereby resulting in insufficient reliability.
Disclosure of Invention
Therefore, the overvoltage detection circuit is provided for solving the technical problem that the device is damaged possibly due to the fact that the output voltage of the flyback switching power supply is increased when the flyback switching power supply is opened in the traditional technology.
The overvoltage detection circuit is characterized by comprising a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded;
the overvoltage detection circuit further comprises a third resistor with one end connected with the voltage output end and a controllable precise voltage-stabilizing source with a cathode connected with the other end of the third resistor, the anode of the controllable precise voltage-stabilizing source is grounded, and the reference electrode of the controllable precise voltage-stabilizing source is connected with the connecting end of the first resistor and the second resistor;
the overvoltage detection circuit further comprises an input end and an optical coupler connected with the third resistor in parallel, a cathode of the optical coupler is connected with a cathode of the controllable precise voltage stabilizing source, an emitting electrode of the optical coupler is grounded, and a collecting electrode of the optical coupler is connected with a Latch port of the power management chip.
Optionally, the overvoltage detection circuit further includes a fourth resistor connected in series with the third resistor, and the other end of the fourth resistor is connected to the voltage output terminal.
Optionally, the overvoltage detection circuit further includes a fifth resistor, one end of the fifth resistor is connected to the collector of the optocoupler, and the other end of the fifth resistor is connected to the Latch port of the power management chip.
Optionally, the overvoltage detection circuit further includes a zener diode having a cathode connected to the collector of the optocoupler, and an anode of the zener diode is grounded.
Optionally, the controllable precision voltage-stabilizing source is a TL432 chip.
The invention also provides an overvoltage detection circuit, which is characterized by comprising a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded;
the overvoltage detection circuit further comprises a third resistor and a controllable precise voltage-stabilizing source, one end of the third resistor is connected with the voltage output end, the other end of the third resistor is connected with the cathode of the controllable precise voltage-stabilizing source, the anode of the controllable precise voltage-stabilizing source is grounded, and the reference electrode of the controllable precise voltage-stabilizing source is connected with the connecting end of the first resistor and the second resistor;
the overvoltage detection circuit further comprises an input end coil and a relay connected with the third resistor in parallel, the negative electrode of the relay is connected with the negative electrode of the controllable precise voltage stabilizing source, one end of the normally open contact of the relay is grounded, and the other end of the normally open contact of the relay is connected with a Latch port of the power management chip.
Optionally, the overvoltage detection circuit further includes a fourth resistor connected in series with the third resistor, and the other end of the fourth resistor is connected to the voltage output terminal.
Optionally, the overvoltage detection circuit further comprises a fifth resistor, one end of the fifth resistor is connected with one end of the normally open contact of the relay, and the other end of the fifth resistor is connected with a Latch port of the power management chip.
Optionally, the overvoltage detection circuit further includes a zener diode having a cathode connected to one end of the normally open contact of the relay, and an anode of the zener diode is grounded.
Optionally, the controllable precision voltage-stabilizing source is a TL432 chip.
The invention also provides an electronic device, which is characterized by comprising a flyback switching power supply circuit, a load and an overvoltage detection circuit connected with the flyback switching power supply load in parallel, wherein one end of the overvoltage detection circuit is connected with a voltage output end of the flyback switching power supply, and the other end of the overvoltage detection circuit is connected with a Latch port of a power management chip in the flyback switching power supply.
In another aspect of the present invention, a method for detecting an over-voltage includes:
connecting a voltage output end to be detected and a Latch port of a power management chip into the overvoltage detection circuit;
when the voltage of the voltage output end is higher than a threshold value corresponding to the conducting voltage of the controllable precise voltage-stabilizing source of the overvoltage detection circuit, the anode and the cathode of the controllable precise voltage-stabilizing source of the overvoltage detection circuit are conducted;
the third resistor is connected with an optical coupler/relay in parallel, and current passes through the third resistor;
transmitting an electric signal to a Latch port of the power management chip through a fifth resistor;
and the power supply management chip judges the voltage output end is overvoltage according to the electric signal received by the Latch port.
The embodiment of the invention has the following beneficial effects:
after the overvoltage detection circuit is added to the flyback switching power supply circuit, when the voltage of the voltage output end is increased, the voltage at two ends of the second resistor R2 is increased, so that the reference voltage of the controllable precise voltage regulator U6 is increased, when the lower detection voltage is reached, the anode and the cathode of the controllable precise voltage regulator U6 are conducted, so that the A, K pole of the optical coupler is conducted, a voltage signal is sent to the Latch pin of the power management chip, and finally the flyback switching power supply is turned off. Therefore, the overvoltage detection circuit can set lower open-loop detection voltage, and avoid damaging devices in the circuit, thereby improving the reliability of the circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an open loop detection circuit of the prior art;
FIG. 2 is a schematic diagram of a first embodiment of an over-voltage detection circuit according to the present invention;
FIG. 3 is a diagram of a second embodiment of an over-voltage detection circuit according to the present invention;
FIG. 4 is a diagram of a third embodiment of an over-voltage detection circuit according to the present invention;
FIG. 5 is a diagram illustrating steps of a method for detecting an over-voltage according to the present invention;
fig. 6 is a block diagram of a fourth embodiment of an over-voltage detection circuit according to the present invention;
fig. 7 is a schematic diagram of a fourth embodiment of an over-voltage detection circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When the flyback switching power supply is in an open loop state, the secondary voltage rises, and the voltage of the auxiliary winding also rises, so that the secondary voltage can be detected by detecting the voltage of the auxiliary winding, and the open loop state can be detected. Fig. 1 is a schematic diagram of an open-loop detection circuit in the prior art, which includes a power management chip U1 with a VCC port connected to an input voltage of an auxiliary winding, a zener diode ZD2 with a cathode connected to the VCC port of the power management chip U1, a capacitor C10 with one end connected to the Latch port of the power management chip U1 and the anode of the zener diode ZD2, and the other end of the capacitor C10 is grounded. When the voltage of VCC end exceeds a certain value, the voltage of Latch pin is reduced to turn off the power supply, thus realizing the purpose of open loop detection. In practice, there may be a malfunction that the secondary voltage is increased due to an increase in the load to turn off the power supply, which may cause the flyback switching power supply to need to set a higher detection voltage during open loop detection, but the setting of the higher detection voltage may damage devices in the circuit. In order to solve the technical problem that the output voltage of the flyback switching power supply in the conventional technology is increased when the flyback switching power supply is open-loop, which may cause device damage, an overvoltage detection circuit is specifically provided in this embodiment, and the following description is provided with reference to the accompanying drawings.
Referring to fig. 2, a schematic diagram of a first embodiment of the overvoltage detection circuit according to the present invention includes a first resistor R1 having one end connected to a voltage output terminal and a second resistor R2 connected in series with the first resistor R1, and the other end of the second resistor R2 is grounded; the voltage regulator further comprises a third resistor R3 with one end connected with the voltage output end and a controllable precise voltage-stabilizing source U6 with the cathode connected with the other end of the third resistor R3, the anode of the controllable precise voltage-stabilizing source U6 is grounded, and the reference electrode of the controllable precise voltage-stabilizing source U6 is connected with the connecting end of the first resistor R1 and the second resistor R2; still include the input with the parallelly connected opto-coupler U5 of third resistance R3, the negative pole of opto-coupler U5 with controllable accurate steady voltage source U6's negative pole is connected, opto-coupler U5's emitter ground connection, opto-coupler U5's collecting electrode and power management chip U2's Latch port are connected.
In this embodiment, the overvoltage detection circuit further includes a fourth resistor R4 connected in series with the third resistor R3, and the other end of the fourth resistor R4 is connected to the voltage output terminal.
In this embodiment, the overvoltage detection circuit further includes a fifth resistor R5 having one end connected to the collector of the optocoupler U5, and the other end of the fifth resistor R5 is connected to the Latch port of the power management chip U2.
In this embodiment, the overvoltage detection circuit further includes a zener diode ZD3 having a cathode connected to the collector of the optocoupler U6, and an anode of the zener diode ZD3 is grounded.
In this embodiment, the controllable precision voltage regulator U6 is a TL432 chip.
It should be noted that the controllable precision voltage regulator U6 adopts a TL432 chip, which is only a preferred embodiment of the present technical solution, and components of other models and parameters may also be selected in the present technical solution.
In this embodiment, when the voltage at the voltage output end rises, the voltages at the two ends of the first resistor R1 and the second resistor R2 rise, the reference voltage of the controllable precision voltage regulator U6 connected with one end of the second resistor R2 rises along with the rise, after a certain value is exceeded, the anode and the cathode of the controllable precision voltage regulator U6 are conducted, current passes through the third resistor R3 and the fourth resistor R4, voltage is generated at the two ends of the third resistor R3, at this time, the light emitting diode in the optocoupler U5 connected in parallel with the third resistor R3 is conducted, and through the electro-optic-electrical conversion, the collector and the emitter of the triode in the optocoupler U5 are conducted, the voltage at the Latch port of the power management chip U2 drops, and the power supply is controlled to stop working, so as to realize the function of open-loop protection. Meanwhile, by adjusting the values of the first resistor R1 and the second resistor R2, a lower open-loop detection voltage can be set without damaging devices in the circuit, thereby improving the reliability of the circuit.
Referring to fig. 3, a schematic diagram of a second embodiment of the overvoltage detection circuit according to the present invention includes a first resistor R1 having one end connected to a voltage output terminal and a second resistor R2 connected in series with the first resistor R1, and the other end of the second resistor R2 is grounded; the voltage regulator further comprises a third resistor R3 with one end connected with the voltage output end and a controllable precise voltage-stabilizing source U6 with the cathode connected with the other end of the third resistor R3, the anode of the controllable precise voltage-stabilizing source U6 is grounded, and the reference electrode of the controllable precise voltage-stabilizing source U6 is connected with the connecting end of the first resistor R1 and the second resistor R2; the high-voltage and high-voltage power supply further comprises a relay KV, an input end coil of the relay KV is connected with the third resistor R3 in parallel, the negative electrode of the relay KV is connected with the cathode of the controllable precision voltage stabilizing source U6, one end of a normally open contact of the relay KV is grounded, and the other end of the normally open contact of the relay KV is connected with a Latch port of the power management chip U2.
In this embodiment, the overvoltage detection circuit further includes a fourth resistor R4 connected in series with the third resistor R3, and the other end of the fourth resistor R4 is connected to the voltage output terminal.
In this embodiment, the overvoltage detection circuit further includes a fifth resistor R5 having one end connected to one end of the normally open contact of the relay KV, and the other end of the fifth resistor R5 is connected to the Latch port of the power management chip U2.
In this embodiment, the overvoltage detection circuit further includes a zener diode ZD3 having a cathode connected to one end of the normally open contact of the relay KV, and an anode of the zener diode ZD3 is grounded.
In this embodiment, the controllable precision voltage regulator U6 is a TL432 chip.
It should be noted that the controllable precision voltage regulator U6 adopts a TL432 chip, which is only a preferred embodiment of the present technical solution, and components of other models and parameters may also be selected in the present technical solution.
In this embodiment, when the voltage at the voltage output end rises, the voltages at the two ends of the first resistor R1 and the second resistor R2 rise, the reference voltage of the controllable precision voltage stabilization source U6 connected with one end of the second resistor R2 rises along with the rise, after a certain value is exceeded, the anode and the cathode of the controllable precision voltage stabilization source U6 are conducted, current passes through the third resistor R3 and the fourth resistor R4, voltage is generated at the two ends of the third resistor R3, a certain current flows through the coil of the relay KV connected in parallel with the third resistor R3 at this time, so that electromagnetic induction is generated, the armature in the relay drives the normally open contact to be closed under the action of magnetic force, the voltage at the Latch port of the power management chip U2 drops, and the power supply is controlled to stop working, so as to realize the function of open-loop protection. Meanwhile, by adjusting the values of the first resistor R1 and the second resistor R2, a lower open-loop detection voltage can be set without damaging devices in the circuit, thereby improving the reliability of the circuit.
Referring to fig. 4, a device diagram of a third embodiment of the overvoltage detection circuit provided by the present invention includes a flyback switching power supply circuit, a load, and an overvoltage detection circuit connected in parallel with the flyback switching power supply load, where one end of the overvoltage detection circuit is connected to a voltage output end of the flyback switching power supply, and the other end of the overvoltage detection circuit is connected to a Latch port of a power management chip in the flyback switching power supply.
By adopting the overvoltage detection circuit, lower open-loop detection voltage can be set, and devices in the circuit cannot be damaged, so that the reliability of the circuit is improved.
Referring to fig. 5, a step diagram of an over-voltage detection circuit method proposed by the present invention includes:
step S102: and connecting a voltage output end to be detected and a Latch port of the power management chip U2 into the overvoltage detection circuit.
Step S104: when the voltage of the voltage output end is higher than a threshold value corresponding to the conducting voltage of the controllable precise voltage-stabilizing source U6 of the overvoltage detection circuit, the anode and the cathode of the controllable precise voltage-stabilizing source U6 of the overvoltage detection circuit are conducted.
After the voltage of the voltage output end is divided by the first resistor R1 and the second resistor R2, the voltage at two ends of the second resistor R2 is the reference voltage of the controllable precise voltage-stabilizing source U6, and the maximum voltage value of the voltage output end can be precisely controlled by adjusting the values of the first resistor R1 and the second resistor R2.
Step S106: the third resistor R3 is connected with an optocoupler U5/relay KV connected with the third resistor R3 in parallel, and transmits an electric signal to a Latch port of the power management chip U2 through a fifth resistor R5.
After the anode and the cathode of the controllable precise voltage-stabilizing source U6 are conducted, current passes through the branches of the third resistor R3 and the fourth resistor R4, voltage is generated at the two ends of an optocoupler U5/relay KV which is connected with the two ends of the third resistor R3 in parallel, when the voltage value exceeds the conduction voltage of a diode in the optocoupler U5 or the control voltage value in the relay KV, the optocoupler U5/relay KV is conducted, current passes through the fifth resistor R5, and the voltage of a Latch port of a power management chip U2 connected with the fifth resistor R5 is reduced.
Step S108: the power management chip U2 judges the voltage output end is overvoltage according to the electric signal received by the Latch port.
After the power management chip U2 receives the electrical signal of Latch port, it can determine that the voltage output end is overvoltage, and send a control signal to the flyback switching power supply circuit to close the circuit, thereby realizing the function of protecting the circuit device.
Referring to fig. 6, a block diagram of a fourth embodiment of the overvoltage detection circuit according to the present invention includes an ac input terminal 102, a silicon bridge 104, a high-voltage capacitor 106, a transformer 108, a power management chip 110, a switching MOS 112, a rectifying diode 114, a filter circuit 116, a feedback circuit 118, and a detection circuit 120. Alternating current is converted into direct current after passing through the silicon bridge 104, the high-voltage capacitor 106 performs filtering, the power management chip 110 controls the on and off of the MOS tube 112, and the transformer 108 transmits primary energy to a secondary. Compared with other flyback switching power supplies, the flyback switching power supply has the advantages that the detection circuit 120 is added, the maximum value of the output voltage of the flyback switching power supply in the open loop can be accurately controlled, devices in the circuit are effectively protected, and the reliability of the circuit is improved.
Referring to fig. 7, in order to illustrate a schematic diagram of a fourth embodiment of the overvoltage detection circuit provided by the present invention, after the overvoltage detection circuit is added to the flyback switching power supply circuit, when the voltage at the voltage output end is increased, the voltage at two ends of the resistor R49 is increased, so that the reference voltage of the controllable precision voltage regulator U6 is increased, and when a lower detection voltage is reached, the anode and the cathode of the controllable precision voltage regulator U6 are turned on, so that the A, K electrode of the optocoupler is turned on, a voltage signal is further sent to the Latch pin of the power management chip, and the flyback switching power supply is finally turned off. Therefore, the overvoltage detection circuit can set a lower open-loop detection voltage without damaging devices in the circuit, thereby improving the reliability of the circuit.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (12)
1. The overvoltage detection circuit is characterized by comprising a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded;
the overvoltage detection circuit further comprises a third resistor and a controllable precise voltage-stabilizing source, one end of the third resistor is connected with the voltage output end, the other end of the third resistor is connected with the cathode of the controllable precise voltage-stabilizing source, the anode of the controllable precise voltage-stabilizing source is grounded, and the reference electrode of the controllable precise voltage-stabilizing source is connected with the connecting end of the first resistor and the second resistor;
the overvoltage detection circuit further comprises an optical coupler, the input end of the optical coupler is connected with the third resistor in parallel, the cathode of the optical coupler is connected with the cathode of the controllable precise voltage-stabilizing source, the emitter of the optical coupler is grounded, and the collector of the optical coupler is connected with a Latch port of the power management chip; wherein the values of the first and second resistors are adjustable to set an open loop sense voltage that does not damage devices in the circuit.
2. The over-voltage detection circuit according to claim 1, further comprising a fourth resistor connected in series with the third resistor, the fourth resistor having another end connected to the voltage output terminal.
3. The overvoltage detection circuit according to claim 1, further comprising a fifth resistor having one end connected to a collector of the optocoupler, wherein the other end of the fifth resistor is connected to a Latch port of the power management chip.
4. The overvoltage detection circuit of claim 1, further comprising a zener diode having a cathode connected to a collector of the optocoupler, an anode of the zener diode being connected to ground.
5. The overvoltage detection circuit of claim 1, wherein the controllable precision voltage regulator is a TL432 chip.
6. The overvoltage detection circuit is characterized by comprising a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded;
the overvoltage detection circuit further comprises a third resistor and a controllable precise voltage-stabilizing source, one end of the third resistor is connected with the voltage output end, the other end of the third resistor is connected with the cathode of the controllable precise voltage-stabilizing source, the anode of the controllable precise voltage-stabilizing source is grounded, and the reference electrode of the controllable precise voltage-stabilizing source is connected with the connecting end of the first resistor and the second resistor;
the overvoltage detection circuit further comprises a relay with an input end coil connected with the third resistor in parallel, the negative electrode of the relay is connected with the cathode of the controllable precise voltage stabilizing source, one end of a normally open contact of the relay is grounded, and the other end of the normally open contact of the relay is connected with a Latch port of the power management chip; wherein the values of the first and second resistors are adjustable to set an open loop sense voltage that does not damage devices in the circuit.
7. The over-voltage detection circuit according to claim 6, further comprising a fourth resistor connected in series with the third resistor, the fourth resistor having another end connected to the voltage output terminal.
8. The over-voltage detection circuit according to claim 6, further comprising a fifth resistor having one end connected to one end of the normally open contact of the relay, wherein the other end of the fifth resistor is connected to the Latch port of the power management chip.
9. The overvoltage detection circuit of claim 6, further comprising a zener diode having a cathode connected to one end of the normally open contact of the relay, the zener diode having an anode connected to ground.
10. The over-voltage detection circuit according to claim 6, wherein the controllable precision voltage regulator is a TL432 chip.
11. An electronic device, comprising a flyback switching power supply circuit and a load, and an overvoltage detection circuit according to any one of claims 1 to 5 or an overvoltage detection circuit according to any one of claims 6 to 10; the overvoltage detection circuit is connected with the flyback switching power supply load in parallel, one end of the overvoltage detection circuit is connected with the voltage output end of the flyback switching power supply, and the other end of the overvoltage detection circuit is connected with a Latch port of a power management chip in the flyback switching power supply.
12. A method of overvoltage detection circuitry, based on the overvoltage detection circuitry of any one of the preceding claims 1 to 10, characterized in that the method comprises:
connecting a voltage output end to be detected and a Latch port of a power management chip into the overvoltage detection circuit; the overvoltage detection circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is connected with a voltage output end, the second resistor is connected with the first resistor in series, and the other end of the second resistor is grounded; the values of the first resistor and the second resistor can be adjusted;
when the voltage of the voltage output end is higher than a threshold value corresponding to the conducting voltage of the controllable precise voltage-stabilizing source of the overvoltage detection circuit, the anode and the cathode of the controllable precise voltage-stabilizing source of the overvoltage detection circuit are conducted;
the third resistor is connected with an optical coupler/relay in parallel, and the optical coupler/relay is connected with the third resistor in parallel, and transmits an electric signal to a Latch port of the power management chip through a fifth resistor;
and the power supply management chip judges the voltage output end is overvoltage according to the electric signal received by the Latch port.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201515223U (en) * | 2009-09-22 | 2010-06-23 | 深圳市宏业昌科技有限公司 | Power supply output overvoltage protective circuit |
| CN201937474U (en) * | 2011-01-26 | 2011-08-17 | 深圳茂硕电源科技股份有限公司 | Power supply adopting simple and practical output overvoltage protection circuit |
| CN103474963A (en) * | 2013-09-13 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Output over-voltage protection circuit of switching power supply |
| CN203522155U (en) * | 2013-11-01 | 2014-04-02 | 广州市爱浦电子科技有限公司 | New type flyback converter input overvoltage protection circuit |
| CN203536942U (en) * | 2013-11-01 | 2014-04-09 | 广州市爱浦电子科技有限公司 | A novel ring choke converter output overvoltage protection circuit |
| CN204089175U (en) * | 2014-08-21 | 2015-01-07 | 康佳集团股份有限公司 | A kind of overvoltage protection circuit of quick response of Switching Power Supply |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2690748A1 (en) * | 1992-04-30 | 1993-11-05 | Sgs Thomson Microelectronics | Very low power voltage threshold detection circuit. |
| CN101873001B (en) * | 2009-04-23 | 2013-04-24 | 立锜科技股份有限公司 | Power supply management control device with reset latch protection function |
| CN104122436A (en) * | 2014-05-21 | 2014-10-29 | 帝奥微电子有限公司 | Anti-interference narrow-pulse over-voltage detection circuit |
| CN208820464U (en) * | 2018-07-20 | 2019-05-03 | 上海东软载波微电子有限公司 | Overvoltage crowbar, integrated high voltage circuit and integrated low-voltage circuit |
-
2016
- 2016-09-09 CN CN201610814788.9A patent/CN106645892B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201515223U (en) * | 2009-09-22 | 2010-06-23 | 深圳市宏业昌科技有限公司 | Power supply output overvoltage protective circuit |
| CN201937474U (en) * | 2011-01-26 | 2011-08-17 | 深圳茂硕电源科技股份有限公司 | Power supply adopting simple and practical output overvoltage protection circuit |
| CN103474963A (en) * | 2013-09-13 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Output over-voltage protection circuit of switching power supply |
| CN203522155U (en) * | 2013-11-01 | 2014-04-02 | 广州市爱浦电子科技有限公司 | New type flyback converter input overvoltage protection circuit |
| CN203536942U (en) * | 2013-11-01 | 2014-04-09 | 广州市爱浦电子科技有限公司 | A novel ring choke converter output overvoltage protection circuit |
| CN204089175U (en) * | 2014-08-21 | 2015-01-07 | 康佳集团股份有限公司 | A kind of overvoltage protection circuit of quick response of Switching Power Supply |
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| CN106645892A (en) | 2017-05-10 |
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