CN109818343B - Overvoltage protection circuit and projector - Google Patents
Overvoltage protection circuit and projector Download PDFInfo
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- CN109818343B CN109818343B CN201711156027.XA CN201711156027A CN109818343B CN 109818343 B CN109818343 B CN 109818343B CN 201711156027 A CN201711156027 A CN 201711156027A CN 109818343 B CN109818343 B CN 109818343B
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- circuit
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- overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
Abstract
The invention relates to the technical field of projection equipment, and discloses an overvoltage protection circuit and a projector, wherein the overvoltage protection circuit comprises: first detection circuitry, switch circuit, action and time delay recovery circuit, wherein, first detection circuitry is used for detecting output voltage, and when output voltage was higher than predetermined excessive pressure value, switch circuit switched on, makes action and time delay recovery circuit trigger the overvoltage protection action, and after the time delay period of predetermineeing, first detection circuitry restarts the output voltage who detects power module to carry out overvoltage protection once more, through the circuit that discrete device constitutes, realized the automatic recovery function after overvoltage protection function and the action, circuit structure is simple, and the price/performance ratio is higher, and this circuit is modular design, is applicable to most power supply circuit, and the commonality is better, has the universality.
Description
Technical Field
The invention relates to the technical field of projection equipment, in particular to an overvoltage protection circuit and a projector.
Background
In a power supply module, an overvoltage protection circuit is generally required in order to make the power supply module operate more reliably. Some control ICs do not have an overvoltage protection function and need to be realized by peripheral circuits; some control ICs integrate the overvoltage protection function, but have the possibility of disordered control, and when overvoltage occurs, effective protection cannot be carried out. Therefore, the existing overvoltage protection circuit has the defects that the overvoltage protection performance is not stable enough or normal output cannot be automatically recovered.
Disclosure of Invention
The invention mainly aims to provide an overvoltage protection circuit and a projector, which realize an overvoltage protection function and an automatic recovery function after action through a circuit formed by discrete devices, and have the advantages of simple circuit structure and higher performance-to-cost ratio.
In order to achieve the above object, the present invention provides an overvoltage protection circuit, including: the circuit comprises a first detection circuit, a switch circuit and an action and delay recovery circuit, wherein the first detection circuit is used for detecting the output voltage of a power module and outputting a control signal to the switch circuit when the output voltage is higher than a preset overvoltage value; the switch circuit is conducted when receiving the control signal; when the switch circuit is conducted, the action and delay recovery circuit triggers the overvoltage protection action, and after a preset delay time period, the first detection circuit restarts detecting the output voltage of the power supply module.
Optionally, the overvoltage protection circuit further comprises a second detection circuit, which is used for detecting the temperature of the power module, when the temperature is higher than a preset first temperature threshold, the alarm module sends an alarm signal, and the heat dissipation module improves the heat dissipation efficiency according to the alarm signal; and when the temperature is higher than a preset second temperature threshold value, the switching circuit is conducted, and the action and delay recovery circuit triggers overvoltage protection action.
Optionally, the overvoltage protection action is specifically: when the switch circuit is switched on, the low voltage is output to the enabling pin of the power supply module, so that the power supply module stops working.
Optionally, the second temperature threshold is greater than the first temperature threshold.
Optionally, the first detection circuit comprises: the voltage stabilizing circuit comprises a resistor R5, a resistor R6, a capacitor C3 and a voltage stabilizing diode U1, wherein the anode of the voltage stabilizing diode U1 is grounded, the reference electrode of the voltage stabilizing diode U1 is connected with one end of a resistor R5, one end of a resistor R6 and one end of a capacitor C3, the other end of a resistor R5 is grounded, the other end of the resistor R6 is connected with an output voltage end V-OUT, and the other end of the capacitor C3 is grounded.
Optionally, the switching circuit comprises: the high-voltage power supply circuit comprises a resistor R1, a resistor R2, a capacitor C1, a triode Q2 and a diode D1, wherein one end of the resistor R2 is connected with the negative electrode of the zener diode U1, the other end of the resistor R2 is connected with one end of the resistor R1, one end of the capacitor C1 and the base electrode of the triode Q2, the other end of the resistor R1 is connected with the other end of the capacitor C1, the emitter of the triode Q2 and a power supply terminal VCC, and the collector of the triode Q2 is connected with the negative electrode of the diode D1.
Optionally, the action and delay recovery circuit comprises: the power supply module comprises a resistor R3, a resistor R4, a capacitor C2 and a field effect transistor Q1, wherein one end of the resistor R3 is connected with the anode of the diode D1, one end of the resistor R4 and the grid of the field effect transistor Q1, the other end of the resistor R3 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R4 is grounded with the source of the field effect transistor Q1, and the drain of the field effect transistor Q1 is connected with an enable pin V-OVP of the power supply module.
According to another aspect of the invention, a projector is provided, which includes the above overvoltage protection circuit, and the overvoltage protection circuit is connected with a power control circuit of the projector.
The invention provides an overvoltage protection circuit and a projector, wherein the circuit comprises: the circuit comprises a first detection circuit, a switch circuit and an action and delay recovery circuit, wherein the first detection circuit is used for detecting the output voltage of a power module and outputting a control signal to the switch circuit when the output voltage is higher than a preset overvoltage value; the switch circuit is conducted when receiving the control signal; when the switching circuit is conducted, the action and the delay recovery circuit trigger the overvoltage protection action, after a preset delay time period, the first detection circuit restarts to detect the output voltage of the power supply module, and the circuit formed by discrete devices realizes the overvoltage protection function and the automatic recovery function after the action.
Drawings
Fig. 1 is a functional schematic diagram of an overvoltage protection circuit according to an embodiment of the present invention;
fig. 2 is a functional schematic diagram of another overvoltage protection circuit according to the first embodiment of the invention;
fig. 3 is a specific circuit diagram of an overvoltage protection circuit according to an embodiment of the invention;
fig. 4 is a graph illustrating the relationship between the voltage and the current of the cathode of the zener diode U1 according to an embodiment of the present invention.
Wherein the reference numerals are: 10-a first detection circuit, 20-a switching circuit, 30-an action and delay recovery circuit, 40-a second detection circuit, 50-an alarm module and 60-a heat dissipation module.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
As shown in fig. 1, in the present embodiment, an overvoltage protection circuit includes: the circuit comprises a first detection circuit 10, a switch circuit 20 and an action and delay recovery circuit 30, wherein the first detection circuit 10 is used for detecting the output voltage of a power module, and when the output voltage is higher than a preset overvoltage value, a control signal is output to the switch circuit 20; the switch circuit 20 is turned on when receiving the control signal; when the switch circuit 20 is turned on, the action and delay recovery circuit 30 triggers the overvoltage protection action, and after a preset delay time period, the first detection circuit restarts detecting the output voltage of the power supply module.
In the embodiment, the circuit formed by discrete devices realizes the overvoltage protection function and the automatic recovery function after action, the circuit is simple in structure and high in cost performance, the circuit is in modular design, is suitable for most power circuits, and is high in universality and universality.
As shown in fig. 2, a functional schematic diagram of another overvoltage protection circuit provided in this embodiment is provided, in this embodiment, the overvoltage protection circuit further includes a second detection circuit 40, configured to detect a temperature of the power module, and when the temperature is higher than a preset first temperature threshold, the alarm module 50 sends an alarm signal, and the heat dissipation module 60 improves heat dissipation efficiency according to the alarm signal; when the temperature is higher than a preset second temperature threshold, the switch circuit 20 is turned on, and the action and delay recovery circuit 30 triggers an overvoltage protection action.
In this embodiment, the overvoltage protection action specifically includes: when the switch circuit is switched on, the low voltage is output to the enabling pin of the power supply module, so that the power supply module stops working.
In this embodiment, the second temperature threshold is greater than the first temperature threshold, that is, the embodiment adopts two-stage protection of alarm and trip for temperature, and the alarm reminds at higher temperature, and improves the heat dissipation efficiency, such as the rotating speed of the heat dissipation fan; and tripping for protection at high temperature to protect equipment safety.
As shown in fig. 3, in the present embodiment, the first detection circuit 10 includes: the voltage stabilizing circuit comprises a resistor R5, a resistor R6, a capacitor C3 and a voltage stabilizing diode U1, wherein the anode of the voltage stabilizing diode U1 is grounded, the reference electrode of the voltage stabilizing diode U1 is connected with one end of a resistor R5, one end of a resistor R6 and one end of a capacitor C3, the other end of a resistor R5 is grounded, the other end of the resistor R6 is connected with an output voltage end V-OUT, and the other end of the capacitor C3 is grounded.
In this embodiment, the resistance value of the resistor R5 is 4.22K Ω, the resistance value of the resistor R6 is 22K Ω, the capacitance value of the capacitor C3 is 10nF, and the model number of the zener diode U1 is TL 431.
In this embodiment, the first detection circuit 10 is configured to monitor the output voltage V-OUT of the power module in real time, and when the voltage exceeds a preset overvoltage value, trigger the zener diode U1 to operate, generate a large current at PIN1, and notify the switch circuit 20 through a circuit connection relationship to prepare for an overvoltage protection operation.
In the present embodiment, a voltage-current relationship diagram of the cathode of the zener diode U1 is shown in fig. 4, and when the voltage of the cathode, that is, the voltage of PIN1 PIN is greater than 2.5V, the current of PIN1 PIN increases rapidly.
In the present embodiment, the switching circuit 20 includes: the high-voltage power supply circuit comprises a resistor R1, a resistor R2, a capacitor C1, a triode Q2 and a diode D1, wherein one end of the resistor R2 is connected with the negative electrode of the zener diode U1, the other end of the resistor R2 is connected with one end of the resistor R1, one end of the capacitor C1 and the base electrode of the triode Q2, the other end of the resistor R1 is connected with the other end of the capacitor C1, the emitter of the triode Q2 and a power supply terminal VCC, and the collector of the triode Q2 is connected with the negative electrode of the diode D1.
In this embodiment, the resistance value of resistance R1 is 1.2K Ω, the resistance value of resistance R2 is 22K Ω, the capacitance value of electric capacity C1 is 0.1 μ F, triode Q2's model is MMBT2907A, diode D1's model is BZT52B 15.
In this embodiment, after the switch circuit 20 receives the large current of the first detection circuit 10, the transistor Q2 is turned on, and notifies the action and the delay recovery circuit 30 to perform the overvoltage protection action.
In the present embodiment, the action and delay recovery circuit 30 includes: the power supply module comprises a resistor R3, a resistor R4, a capacitor C2 and a field effect transistor Q1, wherein one end of the resistor R3 is connected with the anode of the diode D1, one end of the resistor R4 and the grid of the field effect transistor Q1, the other end of the resistor R3 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R4 is grounded with the source of the field effect transistor Q1, and the drain of the field effect transistor Q1 is connected with an enable pin V-OVP of the power supply module.
In this embodiment, the resistance value of the resistor R3 is 1.5K Ω, the resistance value of the resistor R4 is 3M Ω, the capacitance value of the capacitor C2 is 0.47 μ F, and the model number of the fet Q1 is 2N 7002.
In this embodiment, when the switch circuit 20 is turned on, the action and delay recovery circuit 30 performs the overvoltage protection action rapidly, so as to ensure the safety of the device; after protection, the power supply voltage V-OVP is grounded, so that the whole overvoltage protection circuit is not powered by an external power supply, the capacitor C2 discharges after a certain time (delay time), the Q1 is closed, and the overvoltage protection circuit recovers to normally work, so that the circuit not only realizes a quick overvoltage protection function, but also realizes a delay recovery function, the recovery time is adjustable, the user experience is improved, and various requirements of different users are met.
In this embodiment, the working flow of the overvoltage protection circuit is as follows: when the voltage of the output voltage end V-OUT is detected to exceed a preset overvoltage value, the PIN1 of the trigger U1 increases the current, so that the Q2 is conducted, the current from VCC is rapidly charged to C2 through R3, and due to the capacitance charging characteristic, a large drop voltage is formed on R3 when the current ratio is large in the early charging stage, so that Q1 is rapidly conducted, the V-OVP is conducted to the ground, and the overvoltage protection function is triggered, for example, if the V-OVP PIN is connected to a starting enabling PIN of an IC, the IC cannot be enabled and stops working.
After overvoltage protection is carried OUT, no output voltage exists, the voltage of V-OUT becomes low, then Q2 is turned off, VCC voltage does not supply power to the base of Q1 any more, then the charge stored on C2 is slowly released through R3 and R4, a certain time is needed to release the base voltage of Q1 to be lower than a threshold voltage, Q1 is turned off, the IC recovers normal operation, if V-OUT is overvoltage again, the overvoltage protection is triggered again, the cycle starts to repeat, rapid overvoltage protection is formed, and the hiccup state of the overvoltage protection is delayed to be turned on again.
When the overvoltage fault is eliminated, the normal output is automatically recovered, and the V-OVP pin is connected to the IC to normally work.
Example two
In this embodiment, a projector, except for the existing structure, further includes the overvoltage protection circuit described in the first embodiment, where the overvoltage protection circuit is connected to a power control circuit of the projector, and a V-OVP end of the overvoltage protection circuit is connected to the power control circuit of the projector, so as to perform overvoltage protection on the power control circuit; the circuit formed by discrete devices realizes the overvoltage protection function and the automatic recovery function after action, and has simple structure and higher performance-to-cost ratio.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. An overvoltage protection circuit, comprising: the circuit comprises a first detection circuit, a switch circuit and an action and delay recovery circuit, wherein the first detection circuit is used for detecting the output voltage of a power module and outputting a control signal to the switch circuit when the output voltage is higher than a preset overvoltage value; the switch circuit is conducted when receiving the control signal; when the switch circuit is conducted, the action and delay recovery circuit triggers overvoltage protection action, and after a preset delay time period, the first detection circuit restarts to detect the output voltage of the power supply module;
the first detection circuit includes: the voltage regulator circuit comprises a resistor R5, a resistor R6, a capacitor C3 and a voltage stabilizing diode U1, wherein the anode of the voltage stabilizing diode U1 is grounded, the reference electrode of the voltage stabilizing diode U1 is connected with one end of a resistor R5, one end of a resistor R6 and one end of a capacitor C3 together, the other end of a resistor R5 is grounded, the other end of the resistor R6 is connected with an output voltage end V-OUT, and the other end of the capacitor C3 is grounded;
the switching circuit includes: the high-voltage power supply circuit comprises a resistor R1, a resistor R2, a capacitor C1, a triode Q2 and a diode D1, wherein one end of the resistor R2 is connected with the negative electrode of the zener diode U1, the other end of the resistor R2 is connected with one end of the resistor R1, one end of the capacitor C1 and the base electrode of the triode Q2, the other end of the resistor R1 is connected with the other end of the capacitor C1, the emitter of the triode Q2 and a power supply terminal VCC, and the collector of the triode Q2 is connected with the negative electrode of the diode D1.
2. The overvoltage protection circuit according to claim 1, further comprising a second detection circuit for detecting a temperature of the power module, wherein when the temperature is higher than a preset first temperature threshold, the alarm module sends an alarm signal, and the heat dissipation module increases heat dissipation efficiency according to the alarm signal; and when the temperature is higher than a preset second temperature threshold value, the switching circuit is conducted, and the action and delay recovery circuit triggers overvoltage protection action.
3. The overvoltage protection circuit of claim 2, wherein the second temperature threshold is greater than the first temperature threshold.
4. The overvoltage protection circuit according to claim 1, wherein the overvoltage protection action is specifically: when the switch circuit is switched on, the low voltage is output to the enabling pin of the power supply module, so that the power supply module stops working.
5. The overvoltage protection circuit of claim 1, wherein said action and delay recovery circuit comprises: the power supply module comprises a resistor R3, a resistor R4, a capacitor C2 and a field effect transistor Q1, wherein one end of the resistor R3 is connected with the anode of the diode D1, one end of the resistor R4 and the grid of the field effect transistor Q1, the other end of the resistor R3 is connected with one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R4 is grounded with the source of the field effect transistor Q1, and the drain of the field effect transistor Q1 is connected with an enable pin V-OVP of the power supply module.
6. A projector comprising the overvoltage protection circuit of any one of claims 1 to 5, said overvoltage protection circuit being connected to a power control circuit of the projector.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711156027.XA CN109818343B (en) | 2017-11-20 | 2017-11-20 | Overvoltage protection circuit and projector |
| PCT/CN2018/071444 WO2019095536A1 (en) | 2017-11-20 | 2018-01-04 | Overvoltage protection circuit and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711156027.XA CN109818343B (en) | 2017-11-20 | 2017-11-20 | Overvoltage protection circuit and projector |
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| Publication Number | Publication Date |
|---|---|
| CN109818343A CN109818343A (en) | 2019-05-28 |
| CN109818343B true CN109818343B (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711156027.XA Active CN109818343B (en) | 2017-11-20 | 2017-11-20 | Overvoltage protection circuit and projector |
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| CN (1) | CN109818343B (en) |
| WO (1) | WO2019095536A1 (en) |
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| CN102237678A (en) * | 2010-04-30 | 2011-11-09 | 深圳市锦龙通信技术有限公司 | Direct-current remote feeding power system |
| CN103166166A (en) * | 2011-12-08 | 2013-06-19 | 迈普通信技术股份有限公司 | Hot plug controller protective circuit |
| CN203243017U (en) * | 2012-12-27 | 2013-10-16 | 中国移动通信集团内蒙古有限公司 | Safety protection circuit of direct current remote power supply system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109818343A (en) | 2019-05-28 |
| WO2019095536A1 (en) | 2019-05-23 |
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