CN210578475U - Micropower passive time-delay starting circuit - Google Patents
Micropower passive time-delay starting circuit Download PDFInfo
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- CN210578475U CN210578475U CN201920937599.XU CN201920937599U CN210578475U CN 210578475 U CN210578475 U CN 210578475U CN 201920937599 U CN201920937599 U CN 201920937599U CN 210578475 U CN210578475 U CN 210578475U
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Abstract
The utility model provides a passive time delay starting circuit of micropower, including delay circuit, delay circuit includes diode D1, charging resistor subassembly, resistance R4, charging capacitor EC1, zener diode DZ1, triode Q1, zener diode DZ2 and MOS pipe Q2. The utility model discloses a delay circuit has designed two zener diode DZ1 and DZ2, comes the switch-on or the cut-off of drive triode Q1, and then drives the switch-on or the cut-off of MOS pipe Q2 to control the input of rear-electrode equipment power, reach the purpose that the time delay starts; the delay time of the circuit is adjusted by adjusting the parameters of the charging resistor component and the charging capacitor.
Description
Technical Field
The utility model relates to an electronic circuit technical field, more specifically relates to a passive time delay starting circuit of micropower.
Background
If the power input part of the electronic product is not provided with a power switch, the problem of sparking during wiring exists in the use process, for example, when a power adapter of a notebook computer is inserted into a socket, slight electric sparks can be seen, and the plug is caused to be electrically ablated.
The delay starting circuit is usually adopted for occasions without using a power switch, in the delay starting circuit, a relay is usually adopted to realize delay starting of the circuit, the relay has the problems of shaking of a driving signal and jumping of a contact, and the shaking of the driving signal of the relay can cause shaking of the contact to cause electric ablation of the contact, so that the circuit is failed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a overcome above-mentioned problem or solve the passive time delay starting circuit of micropower of above-mentioned problem at least partially.
The utility model provides a passive time delay starting circuit of micropower, including delay circuit, delay circuit includes diode D1, charging resistor subassembly, resistance R4, charging capacitor EC1, zener diode DZ1, triode Q1, zener diode DZ2 and MOS pipe Q2;
the positive electrode of the high-voltage direct current input is connected with the negative electrode of the high-voltage direct current input through the diode D1, the charging resistor assembly, the resistor R4 and the zener diode DZ2 in sequence, the charging capacitor EC1 and the zener diode DZ1 are respectively connected between the common end of the charging resistor assembly and the resistor R4 and the ground wire, the common end is also connected with the emitter of the triode Q1, the base electrode of the triode Q1 is connected with the negative electrode of the high-voltage direct current input through the zener diode DZ2, the collector electrode of the triode Q1 is connected with the gate of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the negative electrode of the high-voltage direct current input, and the drain electrode of the MOS tube Q2 is.
The utility model has the advantages that: two voltage stabilizing diodes DZ1 and DZ2 are designed to drive the on-off of the triode Q1 and further drive the on-off of the MOS tube Q2, so that the input of a rear-electrode equipment power supply is controlled, and the purpose of delayed starting is achieved; the delay time of the circuit is adjusted by adjusting the parameters of the charging resistor component and the charging capacitor.
On the basis of the technical scheme, the utility model discloses can also make following improvement.
Further, the charging resistor assembly comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is connected with the anode of the high-voltage direct-current input through the diode D1, and the other end of the resistor R1 is electrically connected with the resistor R4 through a resistor R2 and a resistor R3.
Furthermore, the delay circuit further comprises a resistor R5, one end of the resistor R5 is connected to the collector of the transistor Q1, and the other end of the transistor Q1 is electrically connected to the source of the MOS transistor Q2.
Furthermore, the micro-power passive delay starting circuit further comprises a power-on reset circuit, the power-on reset circuit is electrically connected with the delay circuit, and the power-on reset circuit is used for controlling the reset of the delay circuit when the high-voltage direct-current input power failure restarts.
Further, the power-on reset circuit comprises a resistor R11, a resistor R12, a resistor R13 and a resistor R14 which are sequentially connected between the positive electrode and the negative electrode of the high-voltage direct-current input, the base electrode of the triode Q1 is connected with the common end of the resistor R13 and the resistor R14, the collector electrode of the triode Q1 is connected with the negative electrode of the high-voltage direct-current input, and the emitter electrode of the triode Q1 is connected with the emitter electrode of the resistor R15.
Drawings
Fig. 1 is a circuit diagram of a micro-power passive delay start circuit according to an embodiment of the present invention.
In the drawings, the names of the components represented by the respective reference numerals are as follows:
1. delay circuit, 2, power-on reset circuit.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the utility model discloses a micropower passive time delay starting circuit is provided, this circuit includes delay circuit 1, delay circuit 1 includes diode D1, charging resistor subassembly, resistance R4, charging capacitor EC1, zener diode DZ1, triode Q1, zener diode DZ2 and MOS pipe Q2.
The positive pole of the high-voltage direct current input HVDC is connected with the negative pole of the high-voltage direct current input through the diode D1, the charging resistor assembly, the resistor R4 and the zener diode DZ2 in sequence, the charging capacitor EC1 and the diode DZ1 are respectively connected between the common end of the charging resistor assembly and the resistor R4 and the ground wire, the common end is also connected with the emitter of the triode Q1, the base of the triode Q1 is connected with the negative pole of the high-voltage direct current input through the zener diode DZ2, the collector of the triode Q1 is connected with the gate of the MOS tube Q2, the source of the MOS tube Q2 is connected with the negative pole of the high-voltage direct current input, and the drain of the MOS tube Q2 is grounded.
The charging resistor assembly comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is connected with the anode of high-voltage direct-current input through the diode D1, and the other end of the resistor R1 is electrically connected with the resistor R4 through a resistor R2 and a resistor R3.
The delay circuit further comprises a resistor R5, one end of the resistor R5 is connected with the collector of the triode Q1, and the other end of the triode Q1 is electrically connected with the source of the MOS transistor Q2.
The working principle of the time delay circuit is as follows: high voltage direct current HVDC is fed into the circuit via connection terminal J1 and the delay circuit starts to operate. The voltage across the charging capacitor EC1 slowly starts to rise from 0V, and the voltage rising rate of the charging capacitor EC1 is determined by the charging resistor component (including the resistor R1, the resistor R2 and the resistor R3) and the charging capacitor EC 1. The zener diode DZ1 and the zener diode DZ2 have different voltage levels, where the operating voltage Vdz1 of the zener diode DZ1 is greater than the operating voltage Vdz2 of the zener diode DZ 2. Because the existence of the voltage stabilizing diode DZ1 can ensure that the voltage of the charging capacitor EC1 does not exceed the working range, the highest charging voltage of the charging capacitor EC1 is Vdz 1. When the voltage of the charging capacitor EC1 is lower than the voltage of the zener diode DZ2, the transistor Q1 is in an off state, the voltage of the G electrode (gate) of the MOS transistor Q2 is 0V, the MOS transistor Q2 is also in an off state at this time, and the negative electrode of the power supply of the post-stage device is not turned on. When the voltage of the charging capacitor EC1 is higher than the voltage of the zener diode DZ2, the zener characteristic of the zener diode DZ2 ensures that the voltage of the pin 1 of the transistor Q1 is lower than the voltage of the pin 2, the conduction condition of the transistor Q1 is satisfied, and the voltage of the charging capacitor EC1 is applied to the gate G (gate) of the MOS transistor Q2 through the transistor Q1. The MOS tube Q2 reaches the conduction condition because of the rising of the voltage of the G pole (grid), so that the D-stage (drain) and the S-stage (source) of the MOS tube Q2 are also conducted, the power supply of the post-stage equipment is completed at the moment, and the purpose of delayed starting of the power supply of the equipment is achieved through the voltage climbing process of the charging capacitor EC 1.
The delay time of the delay circuit is adjusted by 2 methods, namely, the first method is to adjust the resistance value matching of the charging capacitor EC1 and the charging resistor component (comprising a resistor R1, a resistor R2 and a resistor R3), and the delay time of the adjusting circuit is set by different RC parameters. And secondly, regulating the voltage stabilizing values of the voltage stabilizing diode DZ1 and the voltage stabilizing diode DZ2, and improving the conduction voltage parameter of the voltage stabilizing diode DZ2 under the condition that Vdz1 is more than Vdz2, so that the delay time of the circuit can be changed. It is also noted that the regulated voltage value of the zener diode DZ1 should be lower than 18V (20V is the upper limit voltage of the G-pole operation of the MOSFET).
This delay circuit all has the effect of time delay when reaching the start-up at every turn, and the voltage on the charging capacitor EC1 is about 0V when need guaranteeing to power on at every turn, the embodiment of the utility model provides a micropower passive delay start circuit still includes power-on reset circuit 2, and power-on reset circuit 2 is connected with delay circuit 1 electricity for when the high voltage direct current input falls the electric restart, control delay circuit resets.
The power-on reset circuit 2 comprises a resistor R11, a resistor R12, a resistor R13 and a resistor R14 which are sequentially connected between the positive pole and the negative pole of the high-voltage direct-current input, the base electrode of the triode Q1 is connected with the common end of the resistor R13 and the resistor R14, the collector electrode of the triode Q1 is connected with the negative pole of the high-voltage direct-current input, and the emitter electrode of the triode Q1 is connected with the emitter electrode of the triode Q3 through the resistor R15.
When the high-voltage direct-current input J1 is powered on, the voltage division relation of the resistor R11, the resistor R12, the resistor R13 and the resistor R14 ensures that the voltage of the pin 1 of the triode Q3 is higher than the charging cut-off voltage of the charging capacitor EC1, so that the pins 2 and 3 of the triode Q3 are always in a cut-off state, and the delay circuit works normally. When the power of a user is cut off, the pin 1 of the triode Q3 drops immediately due to voltage loss, so that the pins 2 and 3 of the triode Q3 are conducted, the electricity on the charging capacitor EC1 is released, and the voltage Vec1 at two ends of the charging capacitor EC1 is close to 0V. When the voltage across the charging capacitor EC1, Vec1, drops below the operating voltage Vdz2 of the zener diode DZ2, the transistor Q1 turns off, causing the MOSFET transistor Q2 to turn off. The introduction of the power-on reset circuit 2 can realize the delayed start of the post-stage equipment during power-on and the immediate reset of the delay circuit during power-off, thereby ensuring the reliable operation of the whole circuit.
When the circuit works, a special power supply is not needed, and the main control element Q2 is a MOSFET tube and does not need driving current, so that the static power consumption of the circuit can be very low, and the total static current can be less than 2 mA.
The micro-power passive delay starting circuit provided by the utility model effectively solves the problem of wiring and striking when the high voltage direct current system is not allowed to be connected with an input switch by adding the micro-power passive delay starting circuit to the spare power supply part; the circuit is used for delayed starting of the power supply end of the real-time online instrument, wiring can be relieved for users, and the ignition problem of fear is avoided.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The micropower passive time delay starting circuit is characterized by comprising a time delay circuit, wherein the time delay circuit comprises a diode D1, a charging resistor component, a resistor R4, a charging capacitor EC1, a voltage stabilizing diode DZ1, a triode Q1, a voltage stabilizing diode DZ2 and a MOS tube Q2;
the positive electrode of the high-voltage direct current input is connected with the negative electrode of the high-voltage direct current input through the diode D1, the charging resistor assembly, the resistor R4 and the zener diode DZ2 in sequence, the charging capacitor EC1 and the zener diode DZ1 are respectively connected between the common end of the charging resistor assembly and the resistor R4 and the ground wire, the common end is also connected with the emitter of the triode Q1, the base electrode of the triode Q1 is connected with the negative electrode of the high-voltage direct current input through the zener diode DZ2, the collector electrode of the triode Q1 is connected with the gate of the MOS tube Q2, the source electrode of the MOS tube Q2 is connected with the negative electrode of the high-voltage direct current input, and the drain electrode of the MOS tube Q2 is.
2. The micropower passive time-delay starting circuit according to claim 1, wherein the charging resistor assembly comprises a resistor R1, a resistor R2 and a resistor R3, one end of the resistor R1 is connected with the anode of the high-voltage direct-current input through the diode D1, and the other end of the resistor R1 is electrically connected with the resistor R4 through a resistor R2 and a resistor R3.
3. The micropower passive delay starting circuit of claim 1, further comprising a resistor R5, wherein one end of the resistor R5 is connected to the collector of the transistor Q1, and the other end of the transistor Q1 is electrically connected to the source of the MOS transistor Q2.
4. The micropower passive delay starting circuit according to claim 1, further comprising a power-on reset circuit electrically connected to the delay circuit, the power-on reset circuit being configured to control the delay circuit to reset when the high voltage dc input is restarted due to power failure.
5. The micropower passive delay starting circuit according to claim 4, wherein the power-on reset circuit comprises a resistor R11, a resistor R12, a resistor R13 and a resistor R14 which are sequentially connected between the positive pole and the negative pole of the high-voltage direct current input, the base of the triode Q1 is connected with the common end of the resistor R13 and the resistor R14, the collector of the triode Q1 is connected with the negative pole of the high-voltage direct current input, and the emitter of the triode Q1 is connected with the emitter of the resistor R15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920937599.XU CN210578475U (en) | 2019-06-20 | 2019-06-20 | Micropower passive time-delay starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920937599.XU CN210578475U (en) | 2019-06-20 | 2019-06-20 | Micropower passive time-delay starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210578475U true CN210578475U (en) | 2020-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920937599.XU Active CN210578475U (en) | 2019-06-20 | 2019-06-20 | Micropower passive time-delay starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210578475U (en) |
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2019
- 2019-06-20 CN CN201920937599.XU patent/CN210578475U/en active Active
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