CN217692656U - Control circuit with multiple protection functions - Google Patents
Control circuit with multiple protection functions Download PDFInfo
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- CN217692656U CN217692656U CN202221212553.XU CN202221212553U CN217692656U CN 217692656 U CN217692656 U CN 217692656U CN 202221212553 U CN202221212553 U CN 202221212553U CN 217692656 U CN217692656 U CN 217692656U
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Abstract
A control circuit with multiple protection functions comprises an input power supply circuit, an output power supply circuit, a first voltage detection circuit, a voltage stabilizing circuit, a switch circuit, a diode V5 and a diode V1; the input power supply circuit is provided with an IN end and a GND end; the output power supply circuit is provided with a VCC end, a FB end and a-OUT end, and the-OUT end is connected with a GND end; one end of the first voltage detection circuit is connected between the + IN end and the GND end, the other end of the first voltage detection circuit is connected with the cathode end of the diode V5, and the anode end of the first voltage detection circuit is connected with the FB end; two ends of the voltage stabilizing circuit are respectively connected to the + IN end and the GND end; one end of the switch circuit is respectively connected with the front end of the voltage stabilizing circuit and the + IN end, and the other end of the switch circuit is connected with the VCC end; the cathode end of the diode V1 is connected with the cathode end of the diode V5, and the anode end of the diode V1 is connected with the front end of the voltage stabilizing circuit. The control circuit can enable the output power supply voltage to be closed more quickly, saves devices, is simple in design, does not need to introduce software programming, is more efficient and convenient to process, plays a role in two-stage protection, and improves the practicability of the protection function.
Description
Technical Field
The utility model relates to a power module technical field, what specifically say is a control circuit who possesses multiple protect function.
Background
The power module has various protection functions as one of the important performance indexes, but the power module requires a control circuit with multiple protection functions, so that it is necessary to protect an important device or an important voltage signal. All power modules generally have higher requirements on protection functions, such as enable control, under-voltage/over-voltage, short circuit, over-current, over-temperature protection and the like. In order to ensure that the protection function of the power module is complete and can meet the protection requirement, a reliable control circuit is required to realize the protection function, and multiple protection circuits are required to be designed under special conditions, so that the module can realize normal operation under abnormal conditions and cannot be damaged at the time of pause. The traditional power module usually collects voltage values or current values of all points by means of an internal editing program of a singlechip IC and internally compares the voltage values or the current values, so that various protection functions of the power module are realized; and the operational amplifier is used for amplifying or reducing the voltage value, so that the function of overvoltage and undervoltage protection is realized. Such conventional operations often implement various protection functions, but the design is complex, and usually requires the intervention of a software engineer; the circuit only realizes single-stage protection, and if the first-stage protection circuit fails, the protection function cannot be realized in time.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a control circuit who possesses multiple protect function.
In order to realize the technical purpose, the adopted technical scheme is as follows: a control circuit with multiple protection functions comprises an input power supply circuit, an output power supply circuit, a first voltage detection circuit for detecting the voltage of the input power supply circuit, a voltage stabilizing circuit, a switch circuit, a diode V5 and a diode V1;
the input power supply circuit is provided with an IN end and a GND end;
the output power supply circuit is provided with a VCC end, a FB end and a-OUT end, and the-OUT end is connected with a GND end;
one end of the first voltage detection circuit is connected between the + IN end and the GND end, the other end of the first voltage detection circuit is connected with the cathode end of the diode V5, and the anode end of the diode V5 is connected with the FB end;
two ends of the voltage stabilizing circuit are respectively connected to the + IN end and the GND end;
one end of the switch circuit is connected with the front end of the voltage stabilizing circuit and the + IN end respectively, and the other end of the switch circuit is connected with the VCC end;
the cathode end of the diode V1 is connected with the cathode end of the diode V5, and the anode end of the diode V1 is connected with the front end of the voltage stabilizing circuit.
Furthermore, the front end of the voltage detection circuit and/or the voltage stabilizing circuit is connected with a voltage dividing circuit in series.
Furthermore, a filter circuit is connected in parallel to the voltage stabilizing circuit.
Further, the input power supply circuit further comprises an ON/OFF terminal, one end of a second voltage detection circuit is connected to the ON/OFF terminal, and the other end of the second voltage detection circuit is connected to the cathode terminal of the diode V5.
Further, the first voltage detection circuit or the second voltage detection circuit is a BD48 series chip.
Further, a diode V4 is installed on a circuit of the switch circuit connected with the VCC end, the anode end of the diode V4 is connected with the switch circuit, and the cathode end is connected with the VCC end.
The utility model has the advantages that:
1. the circuit design not only realizes the output power supply voltage protection of VCC and FB, but also achieves the effect of protecting the power supply module. The circuit is designed in such a way that the output power supply voltage can be closed more quickly, devices are saved, the design is simple, software programming is not required to be introduced, the efficiency and the convenience are higher than those of the traditional segmented processing, the key point is that the circuit plays a two-stage protection role, and the practicability of the protection function is greatly improved. The operation voltage of the voltage detection circuit can be determined according to the type selection, and the setting and the use of each input voltage range are convenient, particularly for the wide-range voltage input circuit.
2. A diode is added between the switching circuit and the VCC end, so that the current interception function can be realized, and the reverse power supply can be prevented.
Drawings
Fig. 1 is a circuit connection block diagram of the present invention;
fig. 2 is a circuit connection block diagram after the voltage dividing circuit is added in the utility model;
fig. 3 is a circuit diagram of embodiment 1 of the present invention;
fig. 4 is a circuit diagram of embodiment 2 of the present invention;
fig. 5 is a circuit diagram according to embodiment 3 of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a control circuit with multiple protection functions, which can be used in a circuit module, includes an input power supply circuit, an output power supply circuit, a first voltage detection circuit for detecting the voltage of the input power supply circuit, a voltage stabilizing circuit, a switch circuit, a diode V5 and a diode V1; the input power supply circuit is provided with an IN end and a GND end; the output power supply circuit is provided with a VCC end, a FB end and a-OUT end, the-OUT end is connected with the GND end, and the VCC end, the FB end and the-OUT end are used for being connected with an external circuit connected with the control circuit; one end of a first voltage detection circuit is connected between a + IN end and a GND end, the other end of the first voltage detection circuit is connected with a cathode end of a diode V5, an anode end of the diode V5 is connected with a FB end, the FB end is used for being connected with an external circuit, the FB has a working voltage, the first voltage detection circuit is used for detecting whether an input voltage is lower than a minimum starting voltage or not, the first voltage detection circuit does not act when the first voltage detection circuit is at a high level, namely the high-impedance state is realized, the FB can normally supply power, when the input voltage + IN is lower than the minimum starting voltage, namely the + IN voltage value is lower than the minimum jump voltage of N1, the far-end FB voltage is pulled down, and the whole circuit connected with the FB end is turned off, so that a protection function is realized; two ends of the voltage stabilizing circuit are respectively connected to the + IN end and the GND end, and the voltage of the whole control circuit is stabilized; one end of the switch circuit is connected with the front end of the voltage stabilizing circuit and the + IN end respectively, and the other end of the switch circuit is connected with the VCC end; the cathode end of the diode V1 is connected with the cathode end of the diode V5, the anode end of the diode V1 is connected with the front end of the voltage stabilizing circuit, if the voltage of the anode end of the diode V1 is smaller than the voltage stabilizing value of the voltage stabilizing circuit, the voltage stabilizing circuit cannot stabilize the voltage, the switching circuit is not conducted, and then the VCC level is a low level, so that the power supply module cannot work, and the undervoltage protection is realized.
Furthermore, the front end of the voltage detection circuit and/or the voltage stabilizing circuit is connected with a voltage dividing circuit in series, the voltage dividing circuit can normally divide voltage, the input voltage is reduced to the voltage range in which each circuit can work, and the voltage dividing circuit can be added according to the circuit requirements. The resistor can be realized by adopting resistors with various packaging sizes and different resistance values, and mainly has the functions of voltage division or current limitation.
Furthermore, a filter circuit is connected in parallel to the voltage stabilizing circuit, and the filter circuit can realize a filter function.
Further, as shown in fig. 2, the input power supply circuit further includes an ON/OFF terminal, one end of the second voltage detection circuit is connected to the ON/OFF terminal, the other end of the second voltage detection circuit is connected to the cathode terminal of the diode V5, in the positive logic circuit, the ON/OFF terminal is connected to a high level or is floating, the control circuit can output normally, once the ON/OFF terminal is connected to a low level or is grounded through misoperation, the output of the second voltage detection circuit is a low level, so that the FB terminal can be pulled to a low level, the whole circuit connected to the FB terminal is turned OFF, and the FB voltage protection function is realized at this time.
Further, the first voltage detection circuit or the second voltage detection circuit is a BD48 series chip, has a voltage detection function, and is switched on and off by judging voltage through a transistor. Can be determined according to the type selection, and is convenient for setting and using each input voltage range.
Further, install diode V4 on the circuit that switching circuit and VCC end are connected, diode V4's positive pole end and switching circuit connection, the negative pole end is connected with VCC end, and diode V4's effect prevents to supply power to the switching circuit from VCC end in a reverse body for realizing damming.
The diodes are in various packaging sizes and mainly play a role in current interception.
Example 1
The utility model discloses a control circuit who possesses multiple protect function, this circuit comprises 5 resistance (R1-R5), 3 diode (V1, V5), 1 IC semiconductor N1, 1 stabilivolt (V2), 1 NPN type triode (V3), and the relation of connection is as shown in figure 3. One condition is that when the input voltage + IN is lower than the minimum starting voltage, namely the voltage value of + IN is smaller than the minimum jump voltage of the first voltage detection circuit N1, the N1 outputs a low level, on one hand, the voltage of the FB at the far end is pulled down to turn off the FB, and the cathode end of the diode V1 is the low level, so that the triode V3 is not conducted, the VCC is not supplied with power any more, and the two-stage protection function, namely undervoltage protection, is realized; the other condition is that diode V1 positive pole end voltage is less than stabilivolt V2's steady voltage value, causes the unable steady voltage of V2 for triode V3 also does not switch on this moment, and then the VCC level is the low level, has not had the normal power supply of VCC, and the module is closed unable work, and FB also judges, and then also is equivalent to having realized the undervoltage protection function. The circuit design not only realizes the two-stage FB or VCC voltage protection, but also achieves the effect of the protection module.
Example 2
As shown in fig. 4, the embodiment 2 is identical to the embodiment 1 in main body, and is different from the embodiment 1 in that an ON/OFF terminal is added, one terminal of a second voltage detection circuit (IC semiconductor N2) is connected to the ON/OFF terminal, the other terminal of the second voltage detection circuit is connected to a cathode terminal of a diode V5, and for the ON/OFF function of the positive logic start block, if an ON/OFF pin is high or floating, the block outputs normally; in the positive logic circuit, the ON/OFF terminal is connected with a high level or is suspended, the control circuit can normally output, once the ON/OFF terminal is connected with a low level or is grounded through misoperation, the output of the second voltage detection circuit N2 is at a low level, the far-end FB voltage can be pulled to the low level, and the FB is turned OFF; and meanwhile, V3 is not conducted, VCC is also low level, power supply is abnormal, and the module closes output, so that the FB voltage and/or the power module are protected.
Example 3
As shown in fig. 5, embodiment 3 is identical to embodiment 2 in main body, and is different from embodiment 2 in that a capacitor C1 is connected in parallel to a voltage regulator circuit (V2) as a filter circuit, one end of the capacitor C1 is connected to the front end of the voltage regulator circuit, and the other end is grounded to filter the control circuit.
Example 4
Embodiment 4 is the same as embodiment 1 in its main body, and differs from embodiment 2 in that a capacitor C1 is connected in parallel to a voltage regulator circuit (V2) as a filter circuit, one end of the capacitor C1 is connected to the front end of the voltage regulator circuit, and the other end is grounded to filter the control circuit.
Claims (6)
1. A control circuit having multiple protection functions, comprising: the power supply circuit comprises an input power supply circuit, an output power supply circuit, a first voltage detection circuit for detecting the voltage of the input power supply circuit, a voltage stabilizing circuit, a switch circuit, a diode V5 and a diode V1;
the input power supply circuit is provided with an IN end and a GND end;
the output power supply circuit is provided with a VCC end, a FB end and a-OUT end, and the-OUT end is connected with a GND end;
one end of the first voltage detection circuit is connected between the + IN end and the GND end, the other end of the first voltage detection circuit is connected with the cathode end of the diode V5, and the anode end of the diode V5 is connected with the FB end;
two ends of the voltage stabilizing circuit are respectively connected to the + IN end and the GND end;
one end of the switch circuit is respectively connected with the front end of the voltage stabilizing circuit and the + IN end, and the other end of the switch circuit is connected with the VCC end;
the cathode end of the diode V1 is connected with the cathode end of the diode V5, and the anode end of the diode V1 is connected with the front end of the voltage stabilizing circuit.
2. The control circuit with multiple protection functions of claim 1, wherein: the front end of the voltage detection circuit and/or the voltage stabilizing circuit is connected with a voltage dividing circuit in series.
3. The control circuit with multiple protection functions of claim 1, wherein: the voltage stabilizing circuit is connected with a filter circuit in parallel.
4. A control circuit with multiple protection functions as claimed in claim 1, wherein: the input power supply circuit further comprises an ON/OFF end, one end of a second voltage detection circuit is connected to the ON/OFF end, and the other end of the second voltage detection circuit is connected with the cathode end of the diode V5.
5. A control circuit with multiple protection functions as claimed in claim 1 or 4, wherein: the first voltage detection circuit or the second voltage detection circuit is a BD48 series chip.
6. The control circuit with multiple protection functions of claim 1, wherein: and a diode V4 is arranged on a circuit connected with the VCC end of the switch circuit, the anode end of the diode V4 is connected with the switch circuit, and the cathode end is connected with the VCC end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221212553.XU CN217692656U (en) | 2022-05-20 | 2022-05-20 | Control circuit with multiple protection functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221212553.XU CN217692656U (en) | 2022-05-20 | 2022-05-20 | Control circuit with multiple protection functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217692656U true CN217692656U (en) | 2022-10-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221212553.XU Active CN217692656U (en) | 2022-05-20 | 2022-05-20 | Control circuit with multiple protection functions |
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| Country | Link |
|---|---|
| CN (1) | CN217692656U (en) |
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2022
- 2022-05-20 CN CN202221212553.XU patent/CN217692656U/en active Active
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