CN202817734U - Short-circuit protection circuit for electronic switch - Google Patents
Short-circuit protection circuit for electronic switch Download PDFInfo
- Publication number
- CN202817734U CN202817734U CN 201220512889 CN201220512889U CN202817734U CN 202817734 U CN202817734 U CN 202817734U CN 201220512889 CN201220512889 CN 201220512889 CN 201220512889 U CN201220512889 U CN 201220512889U CN 202817734 U CN202817734 U CN 202817734U
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- short
- processing module
- signal processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model relates to a short-circuit protection circuit for an electronic switch, comprising a power supply, a signal collection module, a signal processing module, a voltage stabilizing circuit and a signal control switch, wherein the signal collection module comprises at least one diode, at least one resistor and a transistor, the signal processing module is electrically connected with the signal control switch to input a signal to the signal control switch, the signal processing module is used for switching off the signal control switch according to the input signal of the signal collection module, and the voltage stabilizing circuit comprises a capacitor. When a load works normally, the voltage of the cathode end of the diode of the signal collection module is higher that the voltage of the anode end and the diode is not switched on, such that the signal collection module cannot work, thereby having no effect on systems, having no loss, being smaller in circuit loss, and being more energy-saving, and simultaneously, the protection circuit is smaller in loss, such that the whole circuit is longer in service life.
Description
Technical field
The utility model relates to a kind of electronic circuit, particularly a kind of short-circuit protection circuit that the electronic switch of protection can be provided when load short circuits.
Background technology
Short-circuit protection circuit all is extremely important for various electrical equipment, in case output voltage is short-circuited, may cause circuit burnout, and breaking-up equipment is made troubles and lost to the user.As shown in Figure 1, be the circuit diagram of a kind of short-circuit protection circuit of the prior art.This short-circuit protection circuit comprises a power Vcc, a diode D2,1, one the second resistance R 2 of first resistance R, and a photoelectrical coupler U1A.Described photoelectrical coupler U1A comprises a light-emitting diode D2 and a phototriode T1.When described switch J1 disconnects, namely be equivalent to described load circuit normal operation, power Vcc provides a forward bias to described photoelectrical coupler U1A, described light-emitting diode D2 conducting is luminous, described phototriode T1 is subjected to photoconduction logical, then the voltage of described power Vcc is sent to described load circuit, and is the load circuit power supply.
When described switch J1 is closed; namely being equivalent to described load is short-circuited; described switch J1 is in transient voltage and reduces to 0; also moment is 0V to described resistance R 2 left end voltages; then the voltage on the described resistance R 1 can't make described light-emitting diode D2 conducting, and described light-emitting diode D2 is not luminous, described phototriode T1 cut-off; the voltage of described power Vcc can't be sent to described load circuit, thereby realizes the function of output voltage short-circuit protection.
This short-circuit protection circuit is when circuit works; it also is always in running order, therefore can cause the loss to components and parts such as diode, triodes, but also can increase the consumption of the energy; because loss exists always, also can shorten the life-span of whole circuit in addition.
The utility model content
In view of this, be necessary to provide a kind of short-circuit protection circuit of electronic switch of the consumption that can reduce each components and parts and the energy, to overcome above-mentioned deficiency.
A kind of short-circuit protection circuit of electronic switch comprises a power supply, a signal acquisition module that is electrically connected with power supply, a signal processing module that is electrical connected with this signal acquisition module, a voltage stabilizing circuit, and a Signal-controlled switch.Described signal acquisition module comprises at least one diode, at least one resistance, and a triode.The negative electrode of described diode is connected with positive source, anode is connected with an end of resistance, the base stage of described triode is connected with the other end of resistance, and emitter is connected with the positive pole of power supply, and collector electrode and signal processing module are electrical connected to give this signal processing module input signal.Described signal processing module and Signal-controlled switch are electrically connected to give this Signal-controlled switch input signal.This signal processing module is used for turn-offing described Signal-controlled switch according to the input signal of signal acquisition module.Described voltage stabilizing circuit comprises an electric capacity that is used to described signal acquisition module and signal processing module power supply.
This signal acquisition module is when load works; because the voltage of the cathode terminal of the diode of signal acquisition module is higher than the voltage of anode tap; this not conducting of diode, thereby so that this signal acquisition module do not work, so can be not influential to system yet; also just can not be lossy; compared with prior art, this circuit loss is less, and more energy-conservation; because the protective circuit loss is less, whole circuit has the more long-life simultaneously.When load short circuits; the cathode terminal ground connection of the diode of signal acquisition module; and because the discharge of the electric capacity of voltage stabilizing circuit; the voltage of anode tap is higher than the voltage of cathode terminal; diode current flow, signal acquisition module triggers and sends a signal to signal processing module, and signal processing module is processed this signal and is exported a signal that turn-offs described Signal-controlled switch; thereby close this whole circuit, protect this electronic switch.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described, wherein:
Fig. 1 is the circuit diagram of the short-circuit protection circuit of prior art.
The functional block diagram of the short-circuit protection circuit of a kind of electronic switch that Fig. 2 provides for the utility model.
The circuit diagram of the short-circuit protection circuit of a kind of electronic switch that Fig. 3 provides for the utility model.
The circuit diagram of the short-circuit protection circuit of the another kind of electronic switch that Fig. 4 provides for the utility model.
Embodiment
Below based on accompanying drawing specific embodiment of the utility model is further elaborated.Should be appreciated that specific embodiment described herein only as embodiment, and be not used in restriction protection range of the present utility model.
See also Fig. 2, the functional block diagram of the short-circuit protection circuit of a kind of electronic switch that it provides for the utility model.This short-circuit protection circuit 100 comprises a power supply 10, a voltage stabilizing circuit 11 that is electrically connected with power supply 10; a signal acquisition module 12 that is electrically connected with voltage stabilizing circuit 11; a signal processing module 13 that is electrical connected with this signal acquisition module 12; a Signal-controlled switch 14 that is connected with described signal processing module, and a load 15 that is connected with this Signal-controlled switch 14.
Described power supply 10 is used to whole circuit to comprise that load 15 provides the energy, because the input voltage of power supply 10 is different according to the characteristic of load 15,12V sometimes, 24V sometimes, and for described signal acquisition module 12 and signal processing module 13, need a stable voltage, therefore need a voltage stabilizing circuit 11.As shown in Figure 3, described voltage stabilizing circuit 11 comprises a diode D2,2, one triode Q3 of at least one resistance R, a voltage-stabiliser tube diode D3, and a capacitor C 1.The negative electrode of described diode D2 links to each other with an end of resistance R 2.The other end of resistance R 2 links to each other with the negative electrode of voltage-stabiliser tube diode D3 and the base stage of triode Q3.The collector electrode of triode Q3 is connected with the negative electrode of diode D2, and emitter is connected with the positive pole of capacitor C 1.Voltage-stabiliser tube diode D3 is connected with the negative pole of capacitor C 1, thereby forms this voltage stabilizing circuit 11.The anode of the diode D2 of this voltage stabilizing circuit 11 is connected with the positive pole of power supply 10, the anode of voltage-stabiliser tube D3 is connected with the negative pole of power supply 10, thereby form the input of voltage stabilizing circuit 11, the both positive and negative polarity of capacitor C 1 is the output of this voltage stabilizing circuit 11 simultaneously, in the present embodiment, the both positive and negative polarity of described capacitor C 1 and signal acquisition module 12 are electrical connected.In this voltage stabilizing circuit 11, voltage-stabiliser tube diode D3 chooses the output voltage that will determine this voltage stabilizing circuit 11, and when the input voltage of power supply 10 was larger, because the effect of voltage-stabiliser tube D3, the output voltage of voltage stabilizing circuit 11 will maintain under a certain rated voltage.
Described signal acquisition module 12 comprises a diode D1, at least one resistance R 1, and a positive-negative-positive triode Q1.The negative electrode of described diode D1 is connected with the positive terminal of capacitor C 1, anode is connected with an end of resistance R 1, the base stage of described triode Q1 is connected with the other end of resistance R 1, and emitter is connected with the negative pole end of capacitor C 1, and collector electrode and signal processing module 12 are electrical connected.Described signal acquisition module 12 is used for judging whether whole circuit is in the state of short circuit, and namely when having short circuit to occur in the circuit, signal acquisition module 12 will be triggered and export a signal, and in the present embodiment, this signal is a magnitude of voltage.When circuit is in normal condition, this signal acquisition module 12 will be in closed condition, not export any signal.
Described signal processing module 13 is used for turn-offing described Signal-controlled switch 14 according to the input signal from signal acquisition module 12; thereby reaching this electronic switch of protection avoids burning in short circuit; namely when load 15 short circuit, this Signal-controlled switch 14 will turn-off according to the output signal of signal processing module 13.Described signal processing module 13 can comprise timer, and single-chip microcomputer, or other control units are such as CPU (CPU).As shown in Figure 3, the circuit diagram when comprising a timer for described signal processing module 13 because timer is known general knowledge, here repeats no more.Simultaneously because timer needs auxiliary circuit, as by the C2 among Fig. 3, S1, R3, the control circuit that C3 and R4 consist of is controlled this timer.The signal processing module 13 that this timer consists of will according to the input signal from signal acquisition module 12, judge whether to export a signal that turn-offs described Signal-controlled switch 14.As shown in Figure 4, be the circuit diagram when described signal processing module 13 comprises a single-chip microcomputer.In the present embodiment, described signal processing module 12 comprises a timer.
Described Signal-controlled switch 14 can be master switch, contactor, metal oxide semiconductor field effect tube (Metal-Oxid-Semiconductor is called for short metal-oxide-semiconductor) etc.In the present embodiment, described Signal-controlled switch 14 is metal-oxide-semiconductor.Those skilled in the art should be appreciated that this metal-oxide-semiconductor has grid, drain electrode and source electrode.Described grid is connected with the output of signal processing module 13, and source electrode is connected with the negative pole of power supply 10, and drain electrode is connected with load 15.
Described load 15 can be any light fixture that is applicable to this electronic switch, perhaps other losser circuits etc.
When this circuit normal operation, be load 15 normal operations, described power supply 10 provides a forward bias to load 15, the voltage of the cathode terminal of the diode D1 of signal acquisition module 12 is greater than the voltage of anode tap at this moment, so that this diode D1 is in cut-off state, and then so that this signal acquisition module 12 does not have input signal to be sent to the input of signal processing module 13.
When this circuit is in short-circuit condition, be that load 15 is short-circuited, because the direct ground connection of cathode terminal of diode D1, so that the voltage of the cathode terminal of the diode D1 of signal acquisition module 12 is tending towards 0, and its anode tap is because the discharge of the capacitor C 1 in the voltage stabilizing circuit 11, and then so that the voltage of the anode tap of diode D1 is higher than the voltage of cathode terminal, thereby making this diode D1 conducting, described signal acquisition module 12 triggers.At this moment, triode Q1 will transmit a magnitude of voltage to its collector electrode, and collector electrode is sent to signal processing module 13 with this magnitude of voltage, thereby triggers this signal processing module 13.After 13 pairs of these magnitudes of voltage of signal processing module were processed, exporting a signal, to make Signal-controlled switch 14 be that metal-oxide-semiconductor turn-offs, thereby close this whole circuit, and then protect this electronic switch.
Compared with prior art; this signal acquisition module is when load 15 normal operation, because the voltage of the cathode terminal of the diode D1 of signal acquisition module 12 is higher than the voltage of anode tap, not conducting of this diode D1; thereby so that this signal acquisition module 12 is not worked; can be not influential to system yet, also just can not be lossy, compared with prior art; this circuit loss is less; and more energy-conservation, because the protective circuit loss is less, have the more long-life simultaneously.And when load 15 short circuit; the cathode terminal ground connection of the diode D1 of signal acquisition module 12; and because the discharge of the electric capacity of voltage stabilizing circuit 11; so that the voltage of the anode tap of diode D1 is higher than the voltage of cathode terminal; this diode D1 conducting, signal acquisition module 12 triggers and sends a signal to signal processing module 13, and signal processing module 13 is processed this signal and is exported a signal that turn-offs described Signal-controlled switch 14; thereby close this whole circuit, protect this electronic switch.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all interior any modifications of doing in spirit of the present utility model and principle, be equal to and replace and improvement etc., all should be included in protection range of the present utility model in.
Claims (9)
1. the short-circuit protection circuit of an electronic switch; comprise a power supply; a signal acquisition module that is electrically connected with power supply; a signal processing module that is electrical connected with this signal acquisition module; and Signal-controlled switch; it is characterized in that: described signal acquisition module comprises at least one diode; at least one resistance; and triode; the negative electrode of described diode is connected with positive source; anode is connected with an end of resistance; the base stage of described triode is connected with the other end of resistance; emitter is connected with the positive pole of power supply; collector electrode and signal processing module are electrical connected to give this signal processing module input signal; described signal processing module and Signal-controlled switch are electrically connected to give this Signal-controlled switch input signal; this signal processing module is used for turn-offing described Signal-controlled switch according to the input signal of signal acquisition module; described short-circuit protection circuit also comprises a voltage stabilizing circuit, and this voltage stabilizing circuit comprises an electric capacity that is used to described signal acquisition module and signal processing module power supply.
2. the short-circuit protection circuit of electronic switch as claimed in claim 1, it is characterized in that: described voltage stabilizing circuit also comprises a diode, a triode, a resistance, and a voltage stabilizing didoe.
3. the short-circuit protection circuit of electronic switch as claimed in claim 1, it is characterized in that: described signal processing module comprises a single-chip microcomputer.
4. the short-circuit protection circuit of electronic switch as claimed in claim 1, it is characterized in that: described signal processing module comprises a timer, and the control circuit that is used for this timer work of control.
5. the short-circuit protection circuit of electronic switch as claimed in claim 1 is characterized in that: described Signal-controlled switch is a metal oxide semiconductor field effect tube (Metal-Oxid-Semiconductor is called for short metal-oxide-semiconductor).
6. the short-circuit protection circuit of electronic switch as claimed in claim 5, it is characterized in that: described electronic switch short-circuit protection circuit also comprises a load, and this load is electrically connected between Signal-controlled switch and the positive source.
7. the short-circuit protection circuit of electronic switch as claimed in claim 6, it is characterized in that: the grid of described metal-oxide-semiconductor is connected with the output of signal processing module, and source electrode is connected with power cathode, and drain electrode is connected with described load.
8. the short-circuit protection circuit of electronic switch as claimed in claim 1, it is characterized in that: described Signal-controlled switch is a master switch or contactor.
9. the short-circuit protection circuit of electronic switch as claimed in claim 1, it is characterized in that: described triode is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220512889 CN202817734U (en) | 2012-09-20 | 2012-09-20 | Short-circuit protection circuit for electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220512889 CN202817734U (en) | 2012-09-20 | 2012-09-20 | Short-circuit protection circuit for electronic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202817734U true CN202817734U (en) | 2013-03-20 |
Family
ID=47876548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220512889 Expired - Fee Related CN202817734U (en) | 2012-09-20 | 2012-09-20 | Short-circuit protection circuit for electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202817734U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683215A (en) * | 2012-09-20 | 2014-03-26 | 林万炯 | Short-circuit protection circuit of electronic switch |
-
2012
- 2012-09-20 CN CN 201220512889 patent/CN202817734U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683215A (en) * | 2012-09-20 | 2014-03-26 | 林万炯 | Short-circuit protection circuit of electronic switch |
| CN103683215B (en) * | 2012-09-20 | 2017-04-12 | 赛尔富电子有限公司 | Short-circuit protection circuit of electronic switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103024973B (en) | LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof | |
| CN102780199A (en) | Overcurrent protection circuit and lamp | |
| CN102801138A (en) | Light-emitting diode (LED) over current protection circuit and light fitting | |
| CN214153992U (en) | Control circuit for realizing load switch control and detection protection of single-chip microcomputer IO port | |
| CN102780202A (en) | Overvoltage protection circuit and lamp | |
| CN102780204A (en) | Under-voltage protection circuit and lamp | |
| CN103390878A (en) | Lamp power output overvoltage protection circuit and lamp | |
| CN109613968A (en) | Power supply redundant output circuit with short-circuit protection | |
| CN206272903U (en) | A kind of LED linear constant-current circuit for having output short circuit protection function | |
| CN103683215A (en) | Short-circuit protection circuit of electronic switch | |
| CN203456941U (en) | Efficient battery and external power supply automatic switching circuit having multiple protection function | |
| CN104754800A (en) | Device for controlling input surge current of LED module | |
| CN202817734U (en) | Short-circuit protection circuit for electronic switch | |
| CN205355776U (en) | Short -circuit protection circuit based on power load is unusual | |
| CN103269064B (en) | Zero-power-consumption releasing circuit of anti-interference capacitor at AC end of switching power supply | |
| CN206564464U (en) | A kind of current foldback circuit without sample resistance | |
| CN105578645A (en) | Over-current protection method of LED driving power supply | |
| CN105322499B (en) | A kind of short-circuit protection circuit abnormal based on power source loads | |
| CN201044436Y (en) | Over-current self-locking bridge drive circuit | |
| CN201877778U (en) | Overcurrent protection circuit of solar street lamp | |
| CN205141638U (en) | Switching power supply output short circuit disconnection protection circuit | |
| CN203691701U (en) | Device for controlling input surge current of LED module | |
| CN205071002U (en) | Light module power supply circuit and communications facilities | |
| CN203691703U (en) | Device for controlling surge current of LED module | |
| CN101763699A (en) | Electricity-saving LED light alarm circuit |
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: 20130320 Termination date: 20170920 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |