CN221688527U - Power switch slow start circuit for short circuit diagnosis protection - Google Patents
Power switch slow start circuit for short circuit diagnosis protection Download PDFInfo
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- CN221688527U CN221688527U CN202323000269.3U CN202323000269U CN221688527U CN 221688527 U CN221688527 U CN 221688527U CN 202323000269 U CN202323000269 U CN 202323000269U CN 221688527 U CN221688527 U CN 221688527U
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- power switch
- slow start
- energy storage
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 20
- 238000004146 energy storage Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000001914 filtration Methods 0.000 claims description 10
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000013256 coordination polymer Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to a power switch slow-start circuit for short-circuit diagnosis protection, which aims to solve the technical problems that when the conventional power switch slow-start circuit in the prior art is turned off, the turn-off speed of a MOS tube can be slowed down due to the energy storage and discharge resistance of a capacitor, the turn-off protection under the fault condition is not facilitated, and the conventional power switch slow-start circuit does not have the short-circuit diagnosis function. Comprising the following steps: the switching circuit comprises an input end, an output end and a control end; the control circuit is connected with the control end of the switch circuit; the filter energy storage circuit is connected with the output end of the switch circuit; and the voltage detection circuit is connected with the output end of the switching circuit.
Description
Technical Field
The utility model belongs to the technical field of automobile electronics, and particularly relates to a power switch slow start circuit for short circuit diagnosis and protection.
Background
Along with the improvement of the electronic degree of the automobile and the rapid development of the electric automobile, more and more electronic parts are in automobile parts, and the automobile storage battery supplies power to a plurality of electronic devices at the same time, wherein the parts with high power are not used. Therefore, when many electronic components are powered on, a sufficiently low current surge must be ensured to reduce the sag of the bus voltage and reduce electromagnetic interference. Meanwhile, the parts are required to have a short circuit diagnosis function and a power supply input shutoff function so as to ensure that the power supply can be disconnected when the internal short circuit of the parts fails. Therefore, the power switch slow start circuit with the short circuit diagnosis protection function and the slow start function is an indispensable part in automobile electronic parts.
In the prior art, RC is added between the electrodes G, D of the MOS transistors, and the voltage is slowly increased to the voltage of the direct current power supply by means of the Miller effect, so that the slow start of the switching power supply module is realized.
The prior art has at least the following problems:
1. When the conventional power switch slow start circuit is turned off, the turn-off speed of the MOS tube can be slowed down due to the energy storage and discharge resistance of the capacitor, so that turn-off protection under the fault condition is not facilitated.
2. The existing power switch slow start circuit does not have a short circuit diagnosis function.
Disclosure of utility model
The utility model provides a power switch slow start circuit for short circuit diagnosis protection, which aims to solve the technical problems that when the conventional power switch slow start circuit in the prior art is turned off, the turn-off speed of a MOS tube can be slowed down due to the energy storage and discharge resistance of a capacitor, the turn-off protection under the fault condition is not facilitated, and the conventional power switch slow start circuit does not have the short circuit diagnosis function.
The technical scheme for solving the technical problems is as follows: a power switch slow start circuit for short circuit diagnostic protection, comprising:
The switching circuit comprises an input end, an output end and a control end;
the control circuit is connected with the control end of the switch circuit;
The filter energy storage circuit is connected with the output end of the switch circuit;
and the voltage detection circuit is connected with the filtering energy storage circuit.
The beneficial effects of the utility model are as follows: the utility model realizes the turn-off protection function and the switch circuit slow-start function of the power switch slow-start circuit in a fault state by arranging the control circuit, and enables the power switch slow-start circuit to have a short circuit diagnosis function by arranging the voltage detection circuit.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the above-mentioned switching circuit includes:
The MOS tube D1 has the drain electrode as the input end, the source electrode as the output end and the gate electrode as the control end;
And the resistor R1 is connected between the grid electrode and the source electrode of the MOS tube D1.
The beneficial effects of adopting the further scheme are as follows: according to the utility model, the discharge resistor R1 is added between the grid electrode and the source electrode of the MOS tube D1, so that an antistatic protection effect is realized, and misoperation of the MOS tube D1 is avoided.
Further, the control circuit includes:
the triode Q1, the emitter is connected with the charge pump signal, the collector is connected with the control end;
The resistor R2 is connected between the emitter and the base of the triode Q1;
one end of the resistor R3 is connected with the base electrode of the triode Q1;
The emitting electrode of the triode Q2 is grounded, and the collecting electrode is connected with the other end of the resistor R3;
One end of the resistor R5 is connected with a switch control signal, and the other end of the resistor R5 is connected with the base electrode of the triode Q2;
and a resistor R4 is connected between the emitter and the base of the triode Q2.
The beneficial effects of adopting the further scheme are as follows: the control circuit of the present utility model requires external inputs of a charge pump signal and a switch control signal. The charge pump signal is generated by other chip circuits, and the voltage is referenced to the output terminal. The switch control signal can come from MCU, control the on and off of MOS pipe D1.
Further, the filtering tank circuit includes:
one end of the first filter circuit is connected with the source electrode of the MOS tube D1;
And one end of the energy storage circuit is connected with the other end of the first filter circuit, and the other end of the energy storage circuit is grounded.
The beneficial effects of adopting the further scheme are as follows: the inductance L1 in the filtering energy storage circuit is combined with the capacitor C1 to realize LC filtering, so that the effect of stabilizing voltage fluctuation on a later-stage circuit is achieved, and meanwhile, the capacitance of the capacitor C1 is larger, so that the filtering energy storage circuit has an energy storage effect.
Further, the first filter circuit includes;
One end of the inductor L1 is connected with the source electrode of the MOS tube D1, and the other end of the inductor L1 is connected with the energy storage circuit.
Further, the tank circuit includes:
One end of the capacitor C1 is connected with the first filter circuit, and the other end of the capacitor C is grounded.
Further, the voltage detection circuit includes:
One end of the resistor R6 is connected with the common connection end of the first filter circuit and the energy storage circuit;
one end of the resistor R7 is connected with the other end of the resistor R6, and the other end of the resistor R6 is grounded;
the detection end is connected to the common connection end of the resistor R6 and the resistor R7.
The beneficial effects of adopting the further scheme are as follows: the voltage detection circuit disclosed by the utility model converts a higher voltage range into a voltage range which can be accepted by MCU sampling through series voltage division of the resistor R6 and the resistor R7, and detects through a detection end.
Further, the voltage detection circuit further includes a second filter circuit, where the second filter circuit includes a capacitor C2, and the capacitor C2 is connected in parallel with the resistor R7.
The beneficial effects of adopting the further scheme are as follows: in the utility model, the second filter circuit reduces the alternating current component in the pulsating direct current voltage as much as possible, retains the direct current component, reduces the ripple coefficient of the output voltage and makes the waveform smoother.
Drawings
FIG. 1 is a circuit diagram of a power switch slow start circuit for short circuit diagnostic protection according to one embodiment of the present utility model;
FIG. 2 is a flow chart of control and detection provided in one embodiment of the present utility model.
Detailed Description
The principles and features of the present utility model are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the utility model.
The following describes the technical scheme of the present utility model and how the technical scheme of the present utility model solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present utility model will be described below with reference to the accompanying drawings.
An embodiment of the present utility model provides a possible implementation manner, as shown in fig. 1, and provides a power switch slow start circuit for short circuit diagnosis protection, including:
the switching circuit comprises an input end VI N, an output end VOUT and a control end;
the control circuit is connected with the control end of the switch circuit;
the filter energy storage circuit is connected with the output end VOUT of the switch circuit;
And the voltage detection circuit is connected with the filtering energy storage circuit.
The utility model realizes the turn-off protection function and the switch circuit slow-start function of the power switch slow-start circuit in a fault state by arranging the control circuit, and enables the power switch slow-start circuit to have a short circuit diagnosis function by arranging the voltage detection circuit.
Optionally, the switching circuit includes:
the MOS tube D1 has a drain electrode which is the input end VI N, a source electrode which is the output end VOUT and a gate electrode which is the control end;
And the resistor R1 is connected between the grid electrode and the source electrode of the MOS tube D1.
In the utility model, a discharge resistor R1 is added between the grid electrode and the source electrode of the MOS tube D1, thereby playing a role in preventing static electricity and avoiding misoperation of the MOS tube D1.
Optionally, the control circuit includes:
The triode Q1, the emitter is connected with the charge pump signal CP, the collector is connected with the control end;
The resistor R2 is connected between the emitter and the base of the triode Q1;
one end of the resistor R3 is connected with the base electrode of the triode Q1;
The emitting electrode of the triode Q2 is grounded, and the collecting electrode is connected with the other end of the resistor R3;
One end of the resistor R5 is connected with the switch control signal EN, and the other end of the resistor R5 is connected with the base electrode of the triode Q2;
and a resistor R4 is connected between the emitter and the base of the triode Q2.
Among them, the control circuit of the present utility model requires external inputs of the charge pump signal CP and the switch control signal EN. The charge pump signal CP is generated by other chip circuits, and the voltage is referenced to the output terminal VOUT. The switch control signal EN can come from the MCU to control the on and off of the MOS tube D1.
Optionally, the filtering tank circuit includes:
one end of the first filter circuit is connected with the source electrode of the MOS tube D1;
And one end of the energy storage circuit is connected with the other end of the first filter circuit, and the other end of the energy storage circuit is grounded.
The inductance L1 in the filtering energy storage circuit is combined with the capacitor C1 to realize LC filtering, so that the effect of stabilizing voltage fluctuation on a later-stage circuit is achieved, and meanwhile, the capacitance of the capacitor C1 is larger, so that the energy storage effect is achieved.
Optionally, the first filter circuit includes;
One end of the inductor L1 is connected with the source electrode of the MOS tube D1, and the other end of the inductor L1 is connected with the energy storage circuit.
Optionally, the tank circuit includes:
One end of the capacitor C1 is connected with the first filter circuit, and the other end of the capacitor C is grounded.
Optionally, the voltage detection circuit includes:
One end of the resistor R6 is connected with the common connection end of the first filter circuit and the energy storage circuit;
one end of the resistor R7 is connected with the other end of the resistor R6, and the other end of the resistor R6 is grounded;
the detection end is connected to the common connection end of the resistor R6 and the resistor R7.
The voltage detection circuit disclosed by the utility model is used for converting a higher voltage range into a voltage range which can be accepted by MCU sampling through serial voltage division of the resistor R6 and the resistor R7, and detecting through a detection end.
Optionally, the voltage detection circuit further includes a second filter circuit, where the second filter circuit includes a capacitor C2, and the capacitor C2 is connected in parallel with the resistor R7.
In the utility model, the second filter circuit reduces the alternating current component in the pulsating direct current voltage as much as possible, retains the direct current component, reduces the ripple coefficient of the output voltage and makes the waveform smoother.
Working principle:
The utility model also comprises the functions of on/off control and voltage detection of the MOS tube D1. When both the input end VI N and the charge pump signal CP are valid, the MOS transistor D1 is turned on and the output end VOUT has voltage output when the switch control signal EN is high, and the MOS transistor D1 is turned off and the output end VOUT has no voltage output when the switch control signal EN is low.
The flow chart of control and detection is shown in fig. 2, and the number of pulses, pulse width and period in the flow chart are only examples. After the circuit is electrified, the circuit starts to operate, firstly, the circuit is initialized, then the diagnosis and the on are carried out, namely, a switch control signal EN outputs a high-level pulse with the pulse width of 30us, so that the MOS tube D1 is conducted for a short time, and the capacitor C1 is charged. After waiting 300us, the voltage of the output terminal VOUT is detected to determine the capacitance charge state of the capacitor C1. If the output end VOUT is higher than a certain threshold, the subsequent-stage circuit is not abnormal, and the MOS tube D1 can be slowly started and turned on. When the MOS tube D1 is turned on in a slow start mode, in order to reduce current impact and voltage drop of the input power supply input end VI N at the same time, a pulse-by-pulse on mode is adopted, namely, the switch control signal EN continuously outputs 5 high-level pulses, the pulse width is 30us, the period is 300us, the capacitor C1 is fully charged at the moment, the switch control signal EN is controlled to continuously output high level, and the MOS tube D1 is turned on formally. If the output end VOUT is lower than a certain threshold after "diagnosis is on", which indicates that the capacitor C1 cannot be charged normally, the subsequent stage circuit may have abnormal conditions such as short circuit or electric leakage, and the MOS transistor D1 needs to be turned off, i.e. the switch control signal EN continuously outputs a low level, so as to realize the subsequent stage short circuit diagnosis and perform disconnection protection.
Under the condition of different circuit parameters, the number, pulse width and period of the slow start pulse can be correspondingly adjusted, for example, the capacitance value of the capacitor C1 is larger, the time required by full charge of the capacitor C1 is longer, and the number of the slow start pulse needs to be increased; when the MOS transistor D1 is turned on, if the voltage drop at the input terminal VI N is too large, the pulse width of "diagnostic on" needs to be reduced. In addition, the diagnosis and protection strategies can be correspondingly adjusted according to the requirements.
The above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in the present utility model is not limited to the specific combinations of technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the spirit of the disclosure. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions are replaced with each other.
Claims (8)
1. A power switch slow start circuit for short circuit diagnostic protection, comprising:
The switching circuit comprises an input end, an output end and a control end;
the control circuit is connected with the control end of the switch circuit;
The filter energy storage circuit is connected with the output end of the switch circuit;
and the voltage detection circuit is connected with the filtering energy storage circuit.
2. A power switch slow start circuit for short circuit diagnostic protection as set forth in claim 1, wherein said switching circuit comprises:
The MOS tube D1 has the drain electrode as the input end, the source electrode as the output end and the gate electrode as the control end;
And the resistor R1 is connected between the grid electrode and the source electrode of the MOS tube D1.
3. A power switch slow start circuit for short circuit diagnostic protection as set forth in claim 2, wherein said control circuit comprises:
the triode Q1, the emitter is connected with the charge pump signal, the collector is connected with the control end;
The resistor R2 is connected between the emitter and the base of the triode Q1;
one end of the resistor R3 is connected with the base electrode of the triode Q1;
The emitting electrode of the triode Q2 is grounded, and the collecting electrode is connected with the other end of the resistor R3;
One end of the resistor R5 is connected with a switch control signal, and the other end of the resistor R5 is connected with the base electrode of the triode Q2;
and a resistor R4 is connected between the emitter and the base of the triode Q2.
4. A power switch slow start circuit for short circuit diagnostic protection as set forth in claim 2, wherein said filter tank circuit comprises:
one end of the first filter circuit is connected with the source electrode of the MOS tube D1;
And one end of the energy storage circuit is connected with the other end of the first filter circuit, and the other end of the energy storage circuit is grounded.
5. The power switch slow start circuit for short circuit diagnosis protection according to claim 4, wherein the first filter circuit comprises;
One end of the inductor L1 is connected with the source electrode of the MOS tube D1, and the other end of the inductor L1 is connected with the energy storage circuit.
6. The power switch slow start circuit for short circuit diagnostic protection of claim 4, wherein the tank circuit comprises:
One end of the capacitor C1 is connected with the first filter circuit, and the other end of the capacitor C is grounded.
7. The power switch slow start circuit for short circuit diagnosis protection according to claim 4, wherein the voltage detection circuit comprises:
One end of the resistor R6 is connected with the common connection end of the first filter circuit and the energy storage circuit;
one end of the resistor R7 is connected with the other end of the resistor R6, and the other end of the resistor R6 is grounded;
the detection end is connected to the common connection end of the resistor R6 and the resistor R7.
8. The power switch slow start circuit for short circuit diagnosis protection according to claim 7, wherein the voltage detection circuit further comprises a second filter circuit, the second filter circuit comprises a capacitor C2, and the capacitor C2 is connected in parallel with the resistor R7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323000269.3U CN221688527U (en) | 2023-11-07 | 2023-11-07 | Power switch slow start circuit for short circuit diagnosis protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323000269.3U CN221688527U (en) | 2023-11-07 | 2023-11-07 | Power switch slow start circuit for short circuit diagnosis protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221688527U true CN221688527U (en) | 2024-09-10 |
Family
ID=92619369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323000269.3U Active CN221688527U (en) | 2023-11-07 | 2023-11-07 | Power switch slow start circuit for short circuit diagnosis protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221688527U (en) |
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2023
- 2023-11-07 CN CN202323000269.3U patent/CN221688527U/en active Active
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