CN215817630U - Intelligent direct-current discharge circuit - Google Patents
Intelligent direct-current discharge circuit Download PDFInfo
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- CN215817630U CN215817630U CN202122017728.3U CN202122017728U CN215817630U CN 215817630 U CN215817630 U CN 215817630U CN 202122017728 U CN202122017728 U CN 202122017728U CN 215817630 U CN215817630 U CN 215817630U
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Abstract
The utility model provides an intelligent direct current discharge circuit, which relates to the technical field of direct current discharge circuits and comprises the following components: the input end of the input module receives an external starting signal, and the output end of the input module is connected with the input end of a control module; the input end of the control module receives an external shutdown signal, and the output end of the control module is connected with a source electrode of a field effect transistor; the input end of the discharge module is connected with the input end of the control module, and the output end of the discharge module is connected with the grid electrode of the field effect transistor; the drain electrode of the field effect transistor is connected with a discharge resistor, the control module outputs a control signal according to the shutdown signal to control the discharge module to conduct the field effect transistor, and the discharge resistor discharges. The high-voltage input circuit has the advantages that when a high voltage is input, the electrolytic capacitor at the input end is enabled to discharge rapidly after the circuit is shut down or the clamp end is removed, and harm to a human body is avoided.
Description
Technical Field
The utility model relates to the field of direct current discharge circuits, in particular to an intelligent direct current discharge circuit.
Background
In the existing circuit, the mode that the clamp line of the input end is directly connected with the electrolytic capacitor in parallel is generally adopted, during the normal working stage, the electrolytic capacitor always keeps the voltage (48V/80V) consistent with the input end, when the voltage of the input end is removed, because of the energy storage function and the inherent characteristic of the electrolytic capacitor, the voltage of the electrolytic capacitor cannot be suddenly changed, therefore, the voltage of 48V/80V is still kept, the capacitor end does not have a discharge loop due to the fact that the clamp end is removed, the electrolytic capacitor at the input end is maintained at 48V/80V for a long time, at the moment, if a person touches the electrolytic capacitor carelessly, human health can be possibly harmed, most circuits do not carry out automatic discharge treatment on the input capacitor, self-discharge or air discharge purely depending on the capacitor is slow in discharge rate, and ideal effects are difficult to achieve.
Disclosure of Invention
To solve the problems in the prior art, the present invention provides an intelligent dc discharge circuit, comprising:
the input end of the input module receives an external starting signal, and the output end of the input module is connected with the input end of a control module;
the input end of the control module receives an external shutdown signal, and the output end of the control module is connected with a source electrode of a field effect transistor;
the input end of the discharging module is connected with the input end of the control module, and the output end of the discharging module is connected with the grid electrode of the field effect transistor;
the drain electrode of the field effect transistor is connected with a discharge resistor, the control module outputs a control signal according to the shutdown signal to control the discharge module to conduct the field effect transistor, and an external input capacitor discharges the discharge resistor.
Preferably, the input module includes a first resistor and a first diode, the first resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the input end of the control module through a node.
Preferably, the control module includes:
the input end of the microcontroller is used as the input end of the control module to receive the shutdown signal, and the output end of the microcontroller is connected with a second resistor;
and the base electrode of the triode is connected with the second resistor, the collector electrode of the triode is connected with the output end of the discharge module, the emitting electrode of the triode is respectively connected with a third resistor and the source electrode of the field effect tube, and the emitting electrode of the triode is used as the output end of the control module.
Preferably, a fourth resistor is further connected between the base and the emitter of the triode.
Preferably, the discharge module includes:
the anode of the electrolytic capacitor is connected with the output end of the microcontroller through a fifth resistor, and the cathode of the electrolytic capacitor is grounded;
the sixth resistor is connected between the anode of the electrolytic capacitor and the grid electrode of the field effect transistor;
and the anode of the second diode is connected with a charging power supply, and the cathode of the second diode is connected with the anode of the electrolytic capacitor.
Preferably, the charging power supply is a 12-volt power supply.
Preferably, the electrolytic capacitance is 470 muF/16V.
Preferably, the conduction voltage of the field effect transistor is 6 volts.
The technical scheme has the following advantages or beneficial effects: when a higher voltage is input, the electrolytic capacitor at the input end is enabled to discharge rapidly after the power-off or the clip end is removed, so that the harm to a human body is avoided.
Drawings
FIG. 1 is an electrical schematic diagram of the present circuit in a preferred embodiment of the present invention.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In accordance with the above-mentioned problems occurring in the prior art, there is provided an intelligent dc discharging circuit, comprising:
the input end of the input module 1 receives an external starting signal, and the output end of the input module 1 is connected with the input end of a control module 2;
the input end of the control module 2 receives an external shutdown signal, and the output end of the control module 2 is connected with the source electrode of a field effect transistor Q1;
the input end of the discharge module 3 is connected with the input end of the control module 2, and the output end of the discharge module 3 is connected with the grid of the field effect transistor Q1;
the drain of the fet Q1 is connected to a discharge resistor R1, the control module 2 outputs a control signal according to the shutdown signal to control the discharge module 3 to turn on the fet Q1, and an external input capacitor discharges the discharge resistor R1.
Specifically, in this embodiment, the VCC voltage input terminal discharges when the VCC voltage input terminal is turned off or removed through the discharge resistor R1, when the VCC voltage input terminal normally works, the power-on signal is always kept at a high level, at this time, the control signal output by the control module 2 is also kept at a high level, as long as any one of the two signals is kept at a high level, the discharge circuit can be kept in an inoperative state, when the VCC voltage input is turned off or removed, the power-on signal changes to a low level, the control module 2 sequentially turns off the output after receiving the power-off signal, and picks up the site, the control signal can still keep a high level in a short time, and then the control module 2 outputs a low level control, at this time, the discharge module 3 turns on the fet Q1, the discharge resistor R1 is connected in series to the circuit, and the input capacitor starts to discharge.
Preferably, the fet Q1 may be replaced by a composite transistor such as a darlington transistor.
In the preferred embodiment of the present invention, the input module 1 includes a first resistor R2 and a first diode D1, the first resistor R2 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the input terminal of the control module 2 through a node.
In a preferred embodiment of the present invention, the control module 2 includes:
the input end of the microcontroller MCU is used as the input end of the control module 2 to receive the shutdown signal, and the output end of the microcontroller MCU is connected with a second resistor R3;
and a triode T1, wherein the base of the triode T1 is connected with the second resistor R3, the collector of the triode T1 is connected with the output end of the discharging module 3, the emitter of the triode T1 is respectively connected with a third resistor R4 and the source of a field effect transistor Q1, and the emitter of the triode T1 is used as the output end of the control module 2.
In the preferred embodiment of the present invention, a fourth resistor R5 is connected between the base and the emitter of the transistor T1.
In a preferred embodiment of the present invention, the discharging module 3 includes:
an electrolytic capacitor E1, the anode of the electrolytic capacitor E1 is connected with the output end of the microcontroller MCU through a fifth resistor R6, and the cathode of the electrolytic capacitor E1 is grounded;
a sixth resistor R7, the sixth resistor R7 is connected between the anode of the electrolytic capacitor E1 and the gate of the field effect transistor Q1;
a second diode D2, the anode of the second diode D2 is connected to a charging source, and the cathode of the second diode D2 is connected to the anode of the electrolytic capacitor E1.
Specifically, in the present embodiment, the input capacitor is discharged after each shutdown through the discharge circuit, the discharge time depends on the sizes of the electrolytic capacitor E1 and the discharge resistor R1, and after the power failure, the conduction of the field-effect transistor Q1 requires the electrolytic capacitor E1 to supply power, so that the field-effect transistor Q1 is turned on.
Preferably, the discharge speed is changed by changing the size of the discharge resistor R1, and the smaller the resistance of the discharge resistor R1, the faster the discharge speed, but the power of the discharge resistor R1 must be combined.
In the preferred embodiment of the present invention, the charging power source is a 12 volt power source.
Specifically, in this embodiment, when the whole circuit is not operating, the 12 v charging power supply will automatically charge the electrolytic capacitor E1, so that the electrolytic capacitor E1 is kept within the voltage range of about 12 v.
In the preferred embodiment of the present invention, the electrolytic capacitor E1 is 470 μ F/16V.
In the preferred embodiment of the present invention, the turn-on voltage of the fet Q1 is 6 volts.
Specifically, in this embodiment, when the whole discharge circuit does not work, the voltage of the electrolytic capacitor E1 needs to be kept above 6V to ensure that the fet Q1 is turned on.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (8)
1. An intelligent DC discharge circuit, comprising:
the input end of the input module receives an external starting signal, and the output end of the input module is connected with the input end of a control module;
the input end of the control module receives an external shutdown signal, and the output end of the control module is connected with a source electrode of a field effect transistor;
the input end of the discharging module is connected with the input end of the control module, and the output end of the discharging module is connected with the grid electrode of the field effect transistor;
the drain electrode of the field effect transistor is connected with a discharge resistor, the control module outputs a control signal according to the shutdown signal to control the discharge module to conduct the field effect transistor, and an external input capacitor discharges the discharge resistor.
2. The intelligent dc discharge circuit of claim 1, wherein the input module comprises a first resistor and a first diode, the first resistor is connected to the anode of the first diode, and the cathode of the first diode is connected to the input terminal of the control module through a node.
3. The intelligent dc discharge circuit of claim 1, wherein the control module comprises:
the input end of the microcontroller is used as the input end of the control module to receive the shutdown signal, and the output end of the microcontroller is connected with a second resistor;
and the base electrode of the triode is connected with the second resistor, the collector electrode of the triode is connected with the output end of the discharge module, the emitting electrode of the triode is respectively connected with a third resistor and the source electrode of the field effect tube, and the emitting electrode of the triode is used as the output end of the control module.
4. The intelligent DC discharging circuit of claim 3, wherein a fourth resistor is further connected between the base and the emitter of the triode.
5. The intelligent DC discharge circuit of claim 3, wherein the discharge module comprises:
the anode of the electrolytic capacitor is connected with the output end of the microcontroller through a fifth resistor, and the cathode of the electrolytic capacitor is grounded;
the sixth resistor is connected between the anode of the electrolytic capacitor and the grid electrode of the field effect transistor;
and the anode of the second diode is connected with a charging power supply, and the cathode of the second diode is connected with the anode of the electrolytic capacitor.
6. The intelligent DC discharging circuit according to claim 5, wherein the charging power supply is a 12-volt power supply.
7. The intelligent DC discharge circuit of claim 5, wherein the electrolytic capacitance is 470 μ F/16V.
8. The intelligent dc discharge circuit of claim 1, wherein the turn-on voltage of the fet is 6 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122017728.3U CN215817630U (en) | 2021-08-25 | 2021-08-25 | Intelligent direct-current discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122017728.3U CN215817630U (en) | 2021-08-25 | 2021-08-25 | Intelligent direct-current discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817630U true CN215817630U (en) | 2022-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122017728.3U Active CN215817630U (en) | 2021-08-25 | 2021-08-25 | Intelligent direct-current discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215817630U (en) |
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2021
- 2021-08-25 CN CN202122017728.3U patent/CN215817630U/en active Active
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