CN2728102Y - Delayed start circuit for power supply - Google Patents
Delayed start circuit for power supply Download PDFInfo
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- CN2728102Y CN2728102Y CN 200420053307 CN200420053307U CN2728102Y CN 2728102 Y CN2728102 Y CN 2728102Y CN 200420053307 CN200420053307 CN 200420053307 CN 200420053307 U CN200420053307 U CN 200420053307U CN 2728102 Y CN2728102 Y CN 2728102Y
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- circuit
- power supply
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- triode
- resistor
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Abstract
The utility model relates to a delayed start circuit for a power supply, which comprises a delayed circuit, a control circuit, and a reset circuit, wherein, the delayed circuit can be used for communicating the power supply to generate delay time that loads needs; the control circuit can be used for driving a switch to communicate the loads after judging the delay time is finished; the reset circuit can be used for resetting the delayed circuit after the power supply is cut off. Particularly, a voltage-regulator diode and a current limiting resistor are connected between an input terminal of the power supply and a nodal point of a first resistor and a capacitor in series, cathodes of the first resistor and the capacitor are connected with a second resistor through the input terminal of the power supply, and the other end of the second resistor is connected to ground. The utility model has the advantages that because the delayed start circuits are additionally increased among an auxiliary power supply, a circuit of weak analog signal, and a digital signal processing circuit, which can ensure the load power of the main power source is greater than the total load power of the auxiliary power source, and the start reliability of a whole machine can be improved better particularly in the case that digital signal processing circuits are increased.
Description
One, technical field:
The utility model relates to a kind of power supply delayed start circuit, particularly a kind of power supply delayed start circuit that Switching Power Supply is done.
Two, background technology:
The output of the sharp device of switch electricity (SMPS) usually by No. one main power source and several accessory power supply (+5V ,+12V ,+18V) constitute.Main power source uses for the main circuit of complete machine; And accessory power supply is for simulation small-signal, Digital Signal Processing, row vibration and the use of audio power amplifier circuit of complete machine.SMPS is generally the converting means of a single-ended flyback, and pulse duration is regulated and the output voltage of stable main power source by changing, and is not subjected to the influence that input voltage changes and output loading changes; Accessory power supply then utilizes the electromagnetic coupled relation to be accurate voltage stabilizing state.And being the load of main power source, the precondition that will realize above-mentioned state is greater than the summation of accessory power supply bearing power.Otherwise the output loading characteristic of accessory power supply is very poor, and voltage descends a lot, and might cause the main power source overvoltage, causes the protective circuit action of switching power unit simultaneously.
This situation can not take place in normal operation; but under the complete machine starting state, just can take place; because this moment, the main circuit part was not worked as yet; main power source does not have load; and other accessory power supply loads have been started working; thereby cause the protective circuit action, start failure, can not be completed start-up course.
By analysis, find that this situation exists, the electric current of the simulation small signal circuit of accessory power supply load and digital signal processing circuit is greater than (approximately 100-200mA) particularly, and present application along with a large amount of digitized processing circuit, the load of accessory power supply strengthens (approximately increasing to 2-3A), above-mentioned contradiction rises more and more outstanding, can often cause starting failure, and influence the reliability of complete machine.
Three, summary of the invention:
The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, and a kind of power supply delayed start circuit is provided.
Its technical scheme is: timing circuit is used for the time-delay that energized produces the load needs; Control circuit, be used for judging that time-delay is finished after, driving switch is connected the circuit of load; Reset circuit is used for after power supply disconnects timing circuit being resetted; In described control circuit, the base stage that drives triode is by being used to judge that the voltage stabilizing didoe of voltage is connected with the output of described timing circuit, its anode links to each other with the base stage that drives triode, its grounded emitter, collector electrode links to each other with the base stage of switch triode, the collector electrode of switch triode connects power input, and emitter connects the load power source output; In described timing circuit, first resistance and capacitances in series are between power input and ground wire; Especially connect between the node of first resistance and electric capacity and power input voltage stabilizing didoe and current-limiting resistance, its negative electrode connects second resistance by power input, the other end ground connection of second resistance.
Effect beneficial effect of the present utility model is by additional delayed start circuit between accessory power supply and simulation small signal circuit and digital signal processing circuit, can guarantee the bearing power summation of the load of main power source greater than accessory power supply, particularly under the situation that digital signal processing circuit increases, can improve the reliability that complete machine starts better.
Four, description of drawings:
Fig. 1 circuit theory diagrams of the present utility model.
The circuit theory diagrams of Fig. 2 the utility model one embodiment.
The circuit theory diagrams of another embodiment of Fig. 3 the utility model.
Five, embodiment:
Embodiment 1, and as shown in Figure 1: between power input and the output, comprising delay cell is resistance R
1, capacitor C; Discriminating element is voltage stabilizing didoe DW; Driving element is triode T
2Switch element is triode T
1Reposition element is voltage stabilizing didoe DW2, resistance R
2
One energized, input voltage passes through resistance R
1To the capacitor C charging, through time-delay after a while, make auxiliary circuit, main circuit work, the voltage on the capacitor C punctures voltage stabilizing didoe DW, and turn-on transistor T
1, and then driving switch triode T
2, power supply is communicated with digital signal processing circuit with the simulation small signal circuit, finish the delay start function.After power supply disconnected, the electric charge on the capacitor C then passed through to puncture voltage stabilizing didoe DW2, and passes through R
2Bleed off, delay circuit resets.
In the reset circuit of Fig. 1, when input voltage has fluctuation slightly, reduce to 12V by 16V as input, reset circuit just may be worked.
Embodiment 2, as shown in Figure 2, compared to Figure 1 have been connected in series triode T in reset circuit
3, this moment is as triode T
3During conducting, reset circuit work.Promptly work as input voltage and be lower than a certain value, when being lower than 5V as input voltage, reset circuit is just worked.
Embodiment 3, and Fig. 3 compares with Fig. 2 and be connected in series biasing resistor R again in reset circuit
4, make when input voltage to certain value, as greater than 5V the time, reset circuit just finishes.
Claims (3)
1, a kind of power supply delayed start circuit comprises:
Timing circuit is used for the time-delay that energized produces the load needs;
Control circuit, be used for judging that time-delay is finished after, driving switch is connected the circuit of load;
Reset circuit is used for after power supply disconnects timing circuit being resetted,
In described control circuit, the base stage that drives triode (T2) is connected with the output of described timing circuit by the voltage stabilizing didoe (DW1) that is used to judge voltage, its anode links to each other with the base stage that drives triode (T2), its grounded emitter, collector electrode links to each other with the base stage of switch triode (T1), the collector electrode of switch triode (T1) connects power input, and emitter connects the load power source output;
In described timing circuit, first resistance (R1) and electric capacity (C) are connected between power input and the ground wire;
It is characterized in that: between the node of first resistance (R1) and electric capacity (C) and power input, connect voltage stabilizing didoe (DW2) and current-limiting resistance (R5), its negative electrode connects second resistance (R2) by power input, the other end ground connection of second resistance (R2).
2, power supply delayed start circuit according to claim 1, it is characterized in that between described and voltage stabilizing didoe (DW2) connect triode (T3), its base stage connects the anode of voltage stabilizing didoe (DW2), collector electrode connects the node of first resistance (R1) and electric capacity (C), grounded emitter.
3, power supply delayed start circuit according to claim 2 is characterized in that connecting biasing resistor (R4) again in the base stage of described triode (T3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053307 CN2728102Y (en) | 2004-08-20 | 2004-08-20 | Delayed start circuit for power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420053307 CN2728102Y (en) | 2004-08-20 | 2004-08-20 | Delayed start circuit for power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2728102Y true CN2728102Y (en) | 2005-09-21 |
Family
ID=35044108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420053307 Expired - Fee Related CN2728102Y (en) | 2004-08-20 | 2004-08-20 | Delayed start circuit for power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2728102Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505381B (en) * | 2009-02-23 | 2010-12-01 | 深圳创维－Rgb电子有限公司 | Reset circuit for television set switching on and off |
| CN102194308A (en) * | 2011-05-23 | 2011-09-21 | 东莞市瑞柯电机有限公司 | Radio-frequency infrared remote controller |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
-
2004
- 2004-08-20 CN CN 200420053307 patent/CN2728102Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505381B (en) * | 2009-02-23 | 2010-12-01 | 深圳创维－Rgb电子有限公司 | Reset circuit for television set switching on and off |
| CN102194308A (en) * | 2011-05-23 | 2011-09-21 | 东莞市瑞柯电机有限公司 | Radio-frequency infrared remote controller |
| CN103888113A (en) * | 2014-03-24 | 2014-06-25 | 福建师范大学 | High-level reset circuit capable of rapidly responding to voltage collapse of power source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |