CN219554573U - Overcurrent time-delay protection circuit - Google Patents
Overcurrent time-delay protection circuit Download PDFInfo
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- CN219554573U CN219554573U CN202320504566.2U CN202320504566U CN219554573U CN 219554573 U CN219554573 U CN 219554573U CN 202320504566 U CN202320504566 U CN 202320504566U CN 219554573 U CN219554573 U CN 219554573U
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Abstract
The utility model discloses an overcurrent delay protection circuit. The over-current delay protection circuit comprises a current sampling module, an over-current detection circuit and a signal continuous output circuit. The circuit sampling module is electrically connected to the output end of the main power supply; the overcurrent detection circuit is electrically connected with the current sampling module and is used for detecting the current in the current sampling module. The signal continuous output circuit comprises a signal generation circuit and a signal output circuit, wherein the signal generation circuit is electrically connected with a control power supply, the signal generation circuit is also electrically connected with the overcurrent detection circuit, the signal output circuit is electrically connected with the main power supply, and the signal output circuit is inductively connected with the signal generation circuit so that when the overcurrent detection circuit detects that the current is overlarge, the signal generation circuit continuously outputs an induction signal, and the signal output circuit senses the induction signal and forms the stop output electric signal.
Description
Technical Field
The utility model relates to the technical field of protection circuits, in particular to an overcurrent delay protection circuit.
Background
The overcurrent protection circuit is an important component of the power management chip, and can output signals to the power management chip once the load is overweight or a short circuit exists, so that the power supply stops outputting, and the power supply can be prevented from being burnt out by overlarge current input to the load.
When a short circuit condition occurs in the circuit, an electric signal for stopping working is input to the power management chip, and the power supply is stopped from being output. In order to detect whether the circuit is normal, the power management chip restarts the power supply, and if a short circuit phenomenon still exists, the power supply is interrupted. Therefore, the short circuit phenomenon is not treated in the circuit, and the power supply is continuously and circularly restarted and disconnected, so that the power supply is in a hiccup mode, and finally, electronic components in the circuit are easily damaged.
Disclosure of Invention
One advantage of the present utility model is to provide an over-current delay protection circuit, wherein the signal generating circuit can continuously output the sensing signal to continuously transmit the stop output electric signal to the main power supply, so as to avoid the main power supply from entering a restarting and disconnecting cycle state.
An advantage of the present utility model is to provide an overcurrent time-delay protection circuit, in which the resistance value of the first auxiliary resistor is adjustable, and the time for stopping inputting the output electric signal to the main power supply can be adjusted.
To achieve at least one of the above advantages, the present utility model provides an over-current delay protection circuit capable of extending a stop output electric signal to a main power supply, the over-current delay protection circuit comprising:
the circuit sampling module is electrically connected to the output end of the main power supply and is used for collecting the current output from the main power supply;
the overcurrent detection circuit is electrically connected with the current sampling module and is used for detecting the current in the current sampling module; and
the signal continuous output circuit comprises a signal generation circuit and a signal output circuit, wherein the signal generation circuit is electrically connected with a control power supply, the signal generation circuit is also electrically connected with the overcurrent detection circuit, the signal output circuit is electrically connected with the main power supply, and the signal output circuit is inductively connected with the signal generation circuit, so that when the overcurrent detection circuit detects that the current is overlarge, the signal generation circuit continuously outputs an induction signal, and the signal output circuit senses the induction signal and forms the stop output electric signal.
According to an embodiment of the present utility model, the signal generating circuit includes a control loop and a working loop, the control loop is connected in parallel with the working loop, the control loop is electrically connected with the overcurrent detecting circuit, and the working loop is inductively connected with the signal output circuit.
According to an embodiment of the present utility model, the control loop includes a first triode, an electric storage capacitor and a first auxiliary resistor, wherein an emitter of the first triode is electrically connected to the control power supply, a base of the first triode is electrically connected to the overcurrent detection circuit, a collector of the first triode is simultaneously electrically connected to the first auxiliary resistor and the electric storage capacitor, the auxiliary resistor is connected in parallel with the electric storage capacitor, and the other end of the auxiliary resistor is grounded.
According to an embodiment of the present utility model, the working circuit includes a light emitting diode, a second auxiliary resistor and a second triode. The light emitting diode is electrically connected to the control power supply, the second auxiliary resistor is connected in parallel to two ends of the light emitting diode, the collector electrode of the second triode is simultaneously electrically connected to the second auxiliary resistor and one end of the light emitting diode, which is far away from the control power supply, the emitter electrode of the second triode is grounded, and the base electrode of the second triode is electrically connected to one end of the first auxiliary resistor, which is close to the collector electrode of the first triode.
According to an embodiment of the present utility model, the signal output circuit is implemented as a photodetector capable of generating the stop output electrical signal from the optical signal generated by the light emitting diode.
According to an embodiment of the present utility model, the first auxiliary resistor is further implemented as a resistance value adjustable resistor.
According to an embodiment of the utility model, the working circuit further comprises a first capacitor, which is connected in parallel to the second auxiliary resistor.
According to an embodiment of the present utility model, the over-current detection circuit includes a third auxiliary resistor and a third triode, the third auxiliary resistor is electrically connected to the current sampling module, the other end of the third auxiliary resistor is electrically connected to the base of the third triode, the collector of the third triode is electrically connected to the base of the first triode, and the emitter of the third triode is grounded.
According to an embodiment of the present utility model, the over-current detection circuit further includes a second capacitor, and the second capacitor is connected in parallel to the third auxiliary resistor.
According to an embodiment of the present utility model, the over-current detection circuit further includes a fourth auxiliary resistor connected in series between the base of the first transistor and the collector of the third transistor.
Drawings
Fig. 1 shows a logic block diagram of the over-current delay protection circuit according to the present utility model.
Fig. 2 shows a specific circuit diagram of the over-current delay protection circuit according to the present utility model.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present utility model.
It will be understood that the terms "a" and "an" should be interpreted as referring to "at least one" or "one or more," i.e., in one embodiment, the number of elements may be one, while in another embodiment, the number of elements may be plural, and the term "a" should not be interpreted as limiting the number.
Referring to fig. 1 to 2, an over-current protection circuit according to a preferred embodiment of the present utility model will be described in detail below. The over-current delay protection circuit is used for detecting the current output to a load by a main power supply, and can prolong the time of an electric signal output to the main power supply and stopping output when the current input to the load by the main power supply is overlarge, so that the main power supply can be in a state of stopping output within a preset time, and the main power supply can be prevented from entering a continuous hiccup protection state.
The over-current delay protection circuit comprises a current sampling module 10, an over-current detection circuit 20 and a signal continuous output circuit 30.
The current sampling module 10 is electrically connected to an output end of the main power supply 900, and is configured to collect a current output from the main power supply 900. The over-current detection circuit 20 is electrically connected to the current sampling module 10, and is configured to detect the magnitude of the current in the current sampling module 10.
The signal continuous output circuit 30 includes a signal generating circuit 31 and a signal output circuit 32, wherein the signal generating circuit 31 is electrically connected to a control power VCC, the signal generating circuit 31 is further electrically connected to the over-current detecting circuit 20, the signal output circuit 32 is electrically connected to the main power 900, and the signal output circuit 32 is inductively connected to the signal generating circuit 31. When the overcurrent detection circuit 20 detects that the current in the current sampling module 10 is excessive, the overcurrent detection circuit 20 makes the signal generation circuit 31 conduct, the signal generation circuit 31 continuously outputs an induction signal, the signal output circuit 32 senses the induction signal of the signal generation circuit 31 and correspondingly outputs the stop output electric signal to the main power supply 900, so that the main power supply 900 stops working, and the main power supply 900 can continuously receive the stop output electric signal because the signal generation circuit 31 can continuously output the induction signal, the main power supply 900 can continuously be in a stop working state and cannot be restarted by the outside, so that the main power supply 900 cannot enter a restarting and disconnecting cycle, and the service life of electronic elements in the circuit is prolonged.
The signal generating circuit 31 includes a control loop 311 and a working loop 312, the control loop 311 is connected in parallel with the working loop 312, the control loop 311 is electrically connected with the overcurrent detecting circuit 20, and the working loop 312 is inductively connected with the signal output circuit 32. The control circuit 311 includes a first triode 3111, an electric storage capacitor 3112 and a first auxiliary resistor 3113, where an emitter of the first triode 3111 is electrically connected to the control power VCC, a base of the first triode 3111 is electrically connected to the over-current detection circuit 20, a collector of the first triode 3111 is simultaneously electrically connected to the first auxiliary resistor 3113 and the electric storage capacitor 3112, the auxiliary resistor 3113 is parallel to the electric storage capacitor 3112, and another end of the auxiliary resistor 3113 is grounded.
The operating circuit 312 includes a light emitting diode 3121, a second auxiliary resistor 3122, and a second triode 3123. The light emitting diode 3121 is electrically connected to the control power VCC, the second auxiliary resistor 3122 is connected in parallel to two ends of the light emitting diode 3121, the collector of the second triode 3123 is simultaneously electrically connected to the second auxiliary resistor 3122 and one end of the light emitting diode 3121 far away from the control power VCC, the emitter of the second triode 3123 is grounded, and the base of the second triode 3123 is electrically connected to one end of the first auxiliary resistor 3113 near to the collector of the first triode 3111.
When the current in the overcurrent detecting circuit 20 exceeds a predetermined value, the overcurrent detecting circuit 20 outputs a low level to the base of the first transistor 3111, so that the collector and the emitter of the first transistor 3111 are turned on, and the control power supply VCC is enabled to be turned on with the storage capacitor 3112 and the first auxiliary resistor 3113, that is, the control circuit 311 is turned on. Since the first auxiliary resistor 3113 is electrically connected to the base of the second transistor 3123, when the first transistor 3112 is turned on, the second transistor 3123 is correspondingly turned on, that is, the operating circuit 312 is turned on, so that the second auxiliary resistor 3122 and the light emitting diode 3121 connected in parallel form a circuit with the control power VCC, and the light emitting diode 3121 is energized and emits light, thereby generating the sensing signal. When the light emitting diode 3121 emits light, the signal output circuit 32 receives the light signal and converts the light signal into the stop output electric signal according to the light signal, thereby controlling the main power supply 900 to stop operating. Since the storage capacitor 3112 is connected in parallel with the first auxiliary resistor 3113, when the control power VCC outputs and turns on the voltage of the second transistor 3123, the storage capacitor 3112 is charged by the control power VCC, and the storage capacitor 3112 can continuously supply voltage to the base of the second transistor 3123 when the control power VCC stops being input to the first auxiliary resistor 3113, so that the collector and the emitter of the second transistor 3123 are in a conductive state, and the conductive state of the light emitting diode 3121 and the control power VCC is maintained, thereby prolonging the light emitting duration of the light emitting diode, and prolonging the time for stopping inputting the output electric signal to the main power 900, and avoiding the occurrence of the hiccup phenomenon of the main power 900.
Preferably, the first auxiliary resistor 3113 may be further implemented as a resistance-adjustable resistor, for example, a sliding resistor, and changing the resistance of the first auxiliary resistor 3113 can change the storage capacitor 3112 to prolong the on period of the second transistor 3123, so as to adjust the time for stopping the output of the electrical signal to the main power 900, so that the main power 900 can adapt to situations requiring different delays. Specifically, decreasing the resistance of the first auxiliary resistor 3113 may extend the on-time of the second transistor 3123, and increasing the resistance of the first auxiliary resistor 3113 may decrease the on-time of the second transistor 3123, thereby adjusting the time for stopping the output of the electrical signal to the main power 900.
The working circuit 312 further includes a first capacitor 3124, where the first capacitor 3124 is connected in parallel with the second auxiliary resistor 3122, and the first capacitor 3124 can perform a filtering function in the working circuit 312 to ensure the stable operation of the light emitting diode 3121.
The over-current detection circuit 20 includes a third auxiliary resistor 21 and a third triode 22, the third auxiliary resistor 21 is electrically connected with the current sampling module 10, the other end of the third auxiliary resistor 21 is electrically connected with the base electrode of the third triode 22, the collector electrode of the third triode 22 is electrically connected with the base electrode of the first triode 3111, and the emitter electrode of the third triode 22 is grounded. When the current flowing into the third auxiliary resistor 21 exceeds the turn-on voltage of the base of the third transistor 22, the collector and emitter of the third transistor 22 are turned on, so that the base of the first transistor 3111 is grounded. The over-current detection circuit 20 has the purpose of detecting an over-current, and can send a low level to the base of the first transistor 311 when the over-current is detected.
The over-current detection circuit 20 further comprises a second capacitor 23 and at least one resistor, the second capacitor 23 is connected in parallel to the third auxiliary resistor 21, wherein the number of resistors is specifically three, three resistors are respectively defined as R6, R7 and R9, wherein the resistor R9 is arranged in parallel to the second capacitor 23, wherein the resistor R6 is connected in series between the capacitor 23 and the resistor R9, one end of the resistor R6 is electrically connected to the current sampling module 10, the resistor R7 is connected in series between the capacitor 23 and the third auxiliary resistor 21, and one end of the resistor R7 is electrically connected to the base of the third triode 22. The second capacitor 23 and the resistors R6, R7 and R9 can filter the circuit, so as to ensure that the overcurrent detection circuit 20 stably detects the current transmitted from the current sampling module 10.
The over-current detection circuit 20 further includes a zener diode 24, where the zener diode 24 is connected in series between the resistor R7 and the second capacitor 23, and the zener diode 24 can keep the voltage stable in the circuit when the power voltage fluctuates, so as to ensure that the base of the third triode 22 can be normally turned on.
The over-current detection circuit 20 further includes a fourth auxiliary resistor 25, and the fourth auxiliary resistor 25 is connected in series between the base of the first transistor 3111 and the collector of the third transistor 22, for preventing the base of the first transistor 3111 from being directly grounded.
The signal output circuit 32 is implemented with a photodetector capable of generating an electric signal in accordance with an optical signal, thereby converting the optical signal generated by the light emitting diode 3121 and generating the stop output electric signal, and inputting the stop output electric signal to the main power supply 900, thereby stopping the operation of the main power supply 900. The light emitting diode 3121 and the photodetector are sensitive to the sensing of signals, which is beneficial to quickly generating the stop output electric signal.
The model of the current sampling module 10 may be implemented as GX90XA-10-U2N-3C.
The current sampling module 10 collects the current output by the main power supply 900, and guides the collected current into the third auxiliary resistor 21 of the overcurrent detection circuit 20, when the current output by the main power supply 900 is too large, the voltage of the third auxiliary resistor 21 is correspondingly increased, the base voltage of the third triode 22 is increased, the third triode 22 is an NPN-type triode, the collector and the emitter of the third triode 22 are conducted, so that the base of the first triode 3111 receives a low voltage, the first triode 3111 is a PNP-type triode, the collector and the base of the first triode 3111 are conducted, the control power supply VCC conducts the electric storage capacitor 3112 and the first auxiliary resistor 3113, then the second triode 3123 is conducted through the first auxiliary resistor 3113, the second triode 3123 is an NPN-type triode, so that the control power supply VCC is conducted with the light emitting diode 3121, and the light emitting diode 3121 emits a light signal. The photodetector receives the optical signal and transmits the electrical signal to the main power supply 900, thereby controlling the output of the main power supply 900. When no current is received in the current sampling module 10, the third transistor 22 is turned off, and the first transistor 3111 is not turned on, but since the storage capacitor 3112 is connected in parallel with the first auxiliary resistor 3113, the storage capacitor 3112 can provide voltage for the base of the second transistor 3123, so that the second transistor 3123 is in a conducting state, and the light emitting diode 3121 can still emit light under the condition that the current is lost, so that the time for stopping the transmission of the output electrical signal to the main power 900 is prolonged, and the time for stopping the operation of the main power 900 is prolonged.
In addition, the first auxiliary resistor 3113 may be implemented as a resistance-adjustable resistor, and changing the resistance of the first auxiliary resistor 3113 may adjust the time for the storage capacitor 3112 to supply power to the second transistor 3123, thereby adjusting the time for the main power supply 900 to stop operating.
It will be appreciated by persons skilled in the art that the embodiments of the utility model described above and shown in the drawings are by way of example only and are not limiting. The advantages of the present utility model have been fully and effectively realized. The functional and structural principles of the present utility model have been shown and described in the examples and embodiments of the utility model may be modified or practiced without departing from the principles described.
Claims (10)
1. The overcurrent delay protection circuit can prolong the time of stopping outputting an electric signal output to a main power supply, and is characterized in that the overcurrent delay protection circuit comprises:
the circuit sampling module is electrically connected to the output end of the main power supply and is used for collecting the current output from the main power supply;
the overcurrent detection circuit is electrically connected with the current sampling module and is used for detecting the current in the current sampling module; and
the signal continuous output circuit comprises a signal generation circuit and a signal output circuit, wherein the signal generation circuit is electrically connected with a control power supply, the signal generation circuit is also electrically connected with the overcurrent detection circuit, the signal output circuit is electrically connected with the main power supply, and the signal output circuit is inductively connected with the signal generation circuit, so that when the overcurrent detection circuit detects that the current is overlarge, the signal generation circuit continuously outputs an induction signal, and the signal output circuit senses the induction signal and forms the stop output electric signal.
2. The overcurrent time delay protection circuit of claim 1 wherein the signal generating circuit comprises a control loop and a working loop, the control loop being connected in parallel with the working loop, the control loop being electrically connected to the overcurrent detection circuit, the working loop being inductively connected to the signal output circuit.
3. The overcurrent delay protection circuit of claim 2, wherein the control loop comprises a first triode, an electric storage capacitor and a first auxiliary resistor, the emitter of the first triode is electrically connected with the control power supply, the base of the first triode is electrically connected with the overcurrent detection circuit, the collector of the first triode is simultaneously electrically connected with the first auxiliary resistor and the electric storage capacitor, the auxiliary resistor is connected with the electric storage capacitor in parallel, and the other end of the auxiliary resistor is grounded.
4. The overcurrent delay protection circuit of claim 3 wherein the operating loop comprises a light emitting diode, a second auxiliary resistor and a second triode, the light emitting diode is electrically connected to the control power supply, the second auxiliary resistor is connected in parallel to two ends of the light emitting diode, the collector of the second triode is simultaneously electrically connected to the second auxiliary resistor and one end of the light emitting diode away from the control power supply, the emitter of the second triode is grounded, and the base of the second triode is electrically connected to one end of the first auxiliary resistor near the collector of the first triode.
5. The overcurrent delay protection circuit of claim 4, wherein the signal output circuit is implemented as a photodetector capable of generating the stop output electrical signal from an optical signal generated by the light emitting diode.
6. The overcurrent delay protection circuit of claim 4, wherein the first auxiliary resistor is further implemented as a resistance value adjustable resistor.
7. The overcurrent delay protection circuit of claim 5, wherein the operating loop further comprises a first capacitor, the first capacitor being connected in parallel with the second auxiliary resistor.
8. The overcurrent delay protection circuit of claim 4, wherein the overcurrent detection circuit comprises a third auxiliary resistor and a third triode, the third auxiliary resistor is electrically connected with the current sampling module, the other end of the third auxiliary resistor is electrically connected with the base electrode of the third triode, the collector electrode of the third triode is electrically connected with the base electrode of the first triode, and the emitter electrode of the third triode is grounded.
9. The overcurrent protection circuit according to claim 8, wherein the overcurrent detection circuit further comprises a second capacitor, the second capacitor being connected in parallel with the third auxiliary resistor.
10. The overcurrent delay protection circuit of claim 9, wherein the overcurrent detection circuit further comprises a fourth auxiliary resistor connected in series between the base of the first transistor and the collector of the third transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504566.2U CN219554573U (en) | 2023-03-14 | 2023-03-14 | Overcurrent time-delay protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320504566.2U CN219554573U (en) | 2023-03-14 | 2023-03-14 | Overcurrent time-delay protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219554573U true CN219554573U (en) | 2023-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320504566.2U Active CN219554573U (en) | 2023-03-14 | 2023-03-14 | Overcurrent time-delay protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN219554573U (en) |
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2023
- 2023-03-14 CN CN202320504566.2U patent/CN219554573U/en active Active
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