CN203553907U - Input voltage ripple protection circuit - Google Patents
Input voltage ripple protection circuit Download PDFInfo
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- CN203553907U CN203553907U CN201320674338.6U CN201320674338U CN203553907U CN 203553907 U CN203553907 U CN 203553907U CN 201320674338 U CN201320674338 U CN 201320674338U CN 203553907 U CN203553907 U CN 203553907U
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Abstract
The utility model belongs to the technical field of power supplies and particularly relates to an input voltage ripple protection circuit. The input voltage ripple protection circuit comprises a proportional voltage division circuit, an input control circuit, a voltage stabilization circuit, and a self-locking circuit, wherein the proportional voltage division circuit is used for carrying out proportional voltage division on input voltage signals, and the input end of the proportional voltage division circuit is connected with the input voltage signals; the input control circuit is used for carrying out adjustment on alternating-current ripple-containing input voltage and the input end of the input control circuit is connected with the output end of the proportional voltage division circuit; the output end of the input control circuit is connected with the input end of the voltage stabilization circuit; the self-locking circuit is used for triggering and enabling a power supply driver to stop work, the output end of the voltage stabilization circuit is connected with the input end of the self-locking circuit, and the output end of the self-locking circuit is connected with the power supply driver. According to the input voltage ripple protection circuit, when large ripple exits in the input voltage, electricity is cut off automatically until the ripple returns to the normal state, thereby effectively protecting a load; the working efficiency of the power supply can be improved, and the noise interference can be avoided; an electric appliance (the load) can be prevented from generating harmonic waves; and the power supply output is stabilized, and the current driving ability is enhanced.
Description
Technical field
The utility model belongs to power technique fields, is specifically related to a kind of input voltage ripple protective circuit.
Background technology
Because DC stable power supply is generally formed through links such as rectifying and voltage-stabilizings by AC power, this just inevitably in DC stabilization amount how much with some Alternating Components, this alternating current component being superimposed upon in DC stabilization amount is just referred to as ripple.The composition of ripple is comparatively complicated, and its form is generally the harmonic wave of frequency higher than the similar sine wave of power frequency, another kind of be the impulse wave of narrower in width.For different occasions, to ripple require each different.For capacitor, no matter be that a kind of ripple, so long as not too large, generally on capacitor quality, can not form impact.And to the power supply using in programme-controlled power supply or stereo set, because the pulse of narrower in width does not have enough energy to promote the cone of loudspeaker or the receiver of phone forms noise.Therefore for the requirement of this burst pulse, can relax.
For the ripple signal of the similar sine wave in audiorange, although its amplitude is not too high, its energy makes loudspeaker or receiver that drone noise occur.Therefore to the ripple of this form, should there is certain requirement, and for the occasion for some controls, because reaching certain height, burst pulse can disturb digital or logical control parts, equipment reliability of operation is reduced, therefore to the amplitude of this burst pulse, should there is certain restriction, and ripple to similar sine wave is generally because its amplitude is lower, little to the interference of control assembly.
In LED lighting technical field, when input voltage has larger ripple, LED can produce high temperature, reduces the LED life-span, or produces excessive high-frequency current impact, makes LED lose efficacy in the short time, directly affects the problems such as LED life-span.
Ripple is exactly an alternating component in direct voltage.Direct voltage should be a fixing value, but many times it gets after by ac voltage rectifier, filtering, because filtering is unclean, just has remaining alternating component, nonetheless, by powered battery also because the fluctuation of load produces ripple.In fact, even if best reference voltage source device, its output voltage is also ripply.
Summary of the invention
The purpose of this utility model is the deficiency existing for prior art, and a kind of input voltage ripple protective circuit is provided.
The technical solution of the utility model is achieved in that
A kind of input voltage ripple protective circuit, comprising:
Input voltage signal is carried out to the proportion divider circuit of proportion divider: the input of proportion divider circuit connects input voltage signal;
The input control circuit of adjusting containing AC ripple input voltage: the input of input control circuit connects the output of proportion divider circuit;
Voltage stabilizing circuit: the output of input control circuit connects the input of voltage stabilizing circuit;
Trigger and make the out-of-work latching circuit of power drives: the output of voltage stabilizing circuit connects the input of latching circuit, the output of latching circuit connects power drives.
Described proportion divider circuit comprises:
Divider resistance R1: one end of divider resistance R1 is as the input of input voltage ripple protective circuit;
Divider resistance R2: one end of divider resistance R2 connects the other end of divider resistance R1;
Divider resistance R3: one end of divider resistance R3 connects the other end of divider resistance R2, the other end of divider resistance R3 connects input control circuit.
Described input control circuit comprises capacitor C 1: one end of capacitor C 1 is connected between divider resistance R2 and divider resistance R3;
Capacitor C 2: one end of capacitor C 2 connects the other end of capacitor C 1;
Diode D1: one end of diode D1 connects the other end of capacitor C 2, the other end of diode D1 connects one end of electric capacity E1;
Diode D2: one end of diode D2 connects the other end of capacitor C 2, the other end of diode D2 connects the other end of electric capacity E1, and the other end of electric capacity E1 is ground connection simultaneously.
Described voltage stabilizing circuit comprises:
Voltage stabilizing didoe Z1: one end of voltage stabilizing didoe Z1 is connected to the other end of electric capacity E1;
Voltage stabilizing didoe Z2: one end of voltage stabilizing didoe Z2 connects the other end of voltage stabilizing didoe Z1, and the other end of voltage stabilizing didoe Z2 is connected to latching circuit.
Described latching circuit comprises:
Triode QP1: the collector electrode of triode QP1 connects the other end of voltage stabilizing didoe Z2, and the emitter of triode QP1 is connected to power drives;
Triode QP2: the collector electrode of the equal connecting triode QP1 of the emitter of triode QP2 and base stage, the collector electrode of triode QP2 is base stage and the power drives of connecting triode QP1 respectively.
The beneficial effects of the utility model:
1, when input voltage has larger ripple, auto-breaking to ripple returns to normal condition, effectively protects load;
2, improve the operating efficiency of power supply, avoid noise jamming;
3, avoid electrical appliance (load) to produce harmonic wave;
4, stabilized power supply output, increase current driving ability.
Accompanying drawing explanation
Fig. 1 is the input voltage ripple protective circuit schematic diagram of the utility model embodiment.
Embodiment
Below the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the input voltage ripple protective circuit of present embodiment, comprising:
Input voltage signal is carried out to the proportion divider circuit of proportion divider: the input of proportion divider circuit connects input voltage signal;
The input control circuit of adjusting containing AC ripple input voltage: the input of input control circuit connects the output of proportion divider circuit;
Voltage stabilizing circuit: the output of input control circuit connects the input of voltage stabilizing circuit;
Trigger and make the out-of-work latching circuit of power drives: the output of voltage stabilizing circuit connects the input of latching circuit, the output of latching circuit connects power drives.
Proportion divider circuit comprises:
Divider resistance R1: one end of divider resistance R1 is as the input of input voltage ripple protective circuit;
Divider resistance R2: one end of divider resistance R2 connects the other end of divider resistance R1;
Divider resistance R3: one end of divider resistance R3 connects the other end of divider resistance R2, the other end of divider resistance R3 connects input control circuit.
Input control circuit comprises capacitor C 1: one end of capacitor C 1 is connected between divider resistance R2 and divider resistance R3;
Capacitor C 2: one end of capacitor C 2 connects the other end of capacitor C 1;
Diode D1: one end of diode D1 connects the other end of capacitor C 2, the other end of diode D1 connects one end of electric capacity E1;
Diode D2: one end of diode D2 connects the other end of capacitor C 2, the other end of diode D2 connects the other end of electric capacity E1, and the other end of electric capacity E1 is ground connection simultaneously.
Voltage stabilizing circuit comprises:
Voltage stabilizing didoe Z1: one end of voltage stabilizing didoe Z1 is connected to the other end of electric capacity E1;
Voltage stabilizing didoe Z2: one end of voltage stabilizing didoe Z2 connects the other end of voltage stabilizing didoe Z1, and the other end of voltage stabilizing didoe Z2 is connected to latching circuit.
Latching circuit comprises:
Triode QP1: the collector electrode of triode QP1 connects the other end of voltage stabilizing didoe Z2, and the emitter of triode QP1 is connected to power drives;
Triode QP2: the collector electrode of the equal connecting triode QP1 of the emitter of triode QP2 and base stage, the collector electrode of triode QP2 is base stage and the power drives of connecting triode QP1 respectively.
Input control circuit also comprises:
Resistance R 4: the other end that resistance R 4 is connected to diode D2 connects between the other end of electric capacity E1;
Resistance R 5: resistance R 5 is connected between the other end of diode D1 and the other end of electric capacity E1.
Voltage stabilizing circuit also comprises:
Resistance R 6, its one end that is connected to voltage stabilizing didoe Z2 is between the other end of voltage stabilizing didoe Z1.
Described latching circuit also comprises: capacitor C 3: the collector electrode of one end connecting triode QP1 of capacitor C 3, the emitter of the other end connecting triode QP2 of capacitor C 3;
Resistance R 7: the collector electrode of one end connecting triode QP1 of resistance R 7, the emitter of the other end connecting triode QP2 of resistance R 7;
Resistance R 8: the collector electrode of one end connecting triode QP1 of resistance R 8, the base stage of the other end connecting triode QP2 of resistance R 8;
Resistance R 9: the base stage of one end difference connecting triode QP1 of resistance R 9 and the collector electrode of triode QP2, the emitter of the other end connecting triode QP1 of resistance R 9;
Capacitor C 4: one end of capacitor C 4 is connected to respectively the base stage of triode QP1 and the collector electrode of triode QP2, the emitter of the other end connecting triode QP1 of capacitor C 4.
When input voltage waveform is smoother, resistance R 1, R2 and R3 proportion divider, due to electric capacity " the logical stopping direct current that the exchanges " characteristic of C1 and C2, not conducting of circuit, protective circuit is not worked; When input voltage waveform has larger AC ripple, capacitor C 1 and C2 ceaselessly discharge and recharge, through diode D1 and D2, electric capacity E1 is charged, when reaching the value of voltage stabilizing didoe Z1 setting, Z1 conducting, triggers " latching circuit " that triode QP1 and QP2, consist of, thereby the power supply of power drives IC is moved to the operational voltage value lower than it, IC quits work, and keep, until re-power, and fault is got rid of.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. an input voltage ripple protective circuit, is characterized in that, comprising:
Input voltage signal is carried out to the proportion divider circuit of proportion divider: the input of proportion divider circuit connects input voltage signal;
The input control circuit of adjusting containing AC ripple input voltage: the input of input control circuit connects the output of proportion divider circuit;
Voltage stabilizing circuit: the output of input control circuit connects the input of voltage stabilizing circuit;
Trigger and make the out-of-work latching circuit of power drives: the output of voltage stabilizing circuit connects the input of latching circuit, the output of latching circuit connects power drives.
2. a kind of input voltage ripple protective circuit according to claim 1, is characterized in that, described proportion divider circuit comprises:
Divider resistance R1: one end of divider resistance R1 is as the input of input voltage ripple protective circuit;
Divider resistance R2: one end of divider resistance R2 connects the other end of divider resistance R1;
Divider resistance R3: one end of divider resistance R3 connects the other end of divider resistance R2, the other end of divider resistance R3 connects input control circuit.
3. a kind of input voltage ripple protective circuit according to claim 1, is characterized in that, described input control circuit comprises
Capacitor C 1: one end of capacitor C 1 is connected between divider resistance R2 and divider resistance R3;
Capacitor C 2: one end of capacitor C 2 connects the other end of capacitor C 1;
Diode D1: one end of diode D1 connects the other end of capacitor C 2, the other end of diode D1 connects one end of electric capacity E1;
Diode D2: one end of diode D2 connects the other end of capacitor C 2, the other end of diode D2 connects the other end of electric capacity E1, and the other end of electric capacity E1 is ground connection simultaneously.
4. a kind of input voltage ripple protective circuit according to claim 1, is characterized in that, described voltage stabilizing circuit comprises:
Voltage stabilizing didoe Z1: one end of voltage stabilizing didoe Z1 is connected to the other end of electric capacity E1;
Voltage stabilizing didoe Z2: one end of voltage stabilizing didoe Z2 connects the other end of voltage stabilizing didoe Z1, and the other end of voltage stabilizing didoe Z2 is connected to latching circuit.
5. a kind of input voltage ripple protective circuit according to claim 1, is characterized in that, described latching circuit comprises:
Triode QP1: the collector electrode of triode QP1 connects the other end of voltage stabilizing didoe Z2, and the emitter of triode QP1 is connected to power drives;
Triode QP2: the collector electrode of the equal connecting triode QP1 of the emitter of triode QP2 and base stage, the collector electrode of triode QP2 is base stage and the power drives of connecting triode QP1 respectively.
6. a kind of input voltage ripple protective circuit according to claim 3, is characterized in that, described input control circuit also comprises:
Resistance R 4: the other end that resistance R 4 is connected to diode D2 connects between the other end of electric capacity E1;
Resistance R 5: resistance R 5 is connected between the other end of diode D1 and the other end of electric capacity E1.
7. a kind of input voltage ripple protective circuit according to claim 4, is characterized in that, described voltage stabilizing circuit also comprises:
Resistance R 6, its one end that is connected to voltage stabilizing didoe Z2 is between the other end of voltage stabilizing didoe Z1.
8. a kind of input voltage ripple protective circuit according to claim 5, is characterized in that, described latching circuit also comprises:
Capacitor C 3: the collector electrode of one end connecting triode QP1 of capacitor C 3, the emitter of the other end connecting triode QP2 of capacitor C 3;
Resistance R 7: the collector electrode of one end connecting triode QP1 of resistance R 7, the emitter of the other end connecting triode QP2 of resistance R 7;
Resistance R 8: the collector electrode of one end connecting triode QP1 of resistance R 8, the base stage of the other end connecting triode QP2 of resistance R 8;
Resistance R 9: the base stage of one end difference connecting triode QP1 of resistance R 9 and the collector electrode of triode QP2, the emitter of the other end connecting triode QP1 of resistance R 9;
Capacitor C 4: one end of capacitor C 4 is connected to respectively the base stage of triode QP1 and the collector electrode of triode QP2, the emitter of the other end connecting triode QP1 of capacitor C 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320674338.6U CN203553907U (en) | 2013-10-29 | 2013-10-29 | Input voltage ripple protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320674338.6U CN203553907U (en) | 2013-10-29 | 2013-10-29 | Input voltage ripple protection circuit |
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| Publication Number | Publication Date |
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| CN203553907U true CN203553907U (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320674338.6U Expired - Fee Related CN203553907U (en) | 2013-10-29 | 2013-10-29 | Input voltage ripple protection circuit |
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| CN (1) | CN203553907U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790220A (en) * | 2014-12-17 | 2016-07-20 | 国家电网公司 | Short-circuit protection circuit and method for half-bridge topology converter |
-
2013
- 2013-10-29 CN CN201320674338.6U patent/CN203553907U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790220A (en) * | 2014-12-17 | 2016-07-20 | 国家电网公司 | Short-circuit protection circuit and method for half-bridge topology converter |
| CN105790220B (en) * | 2014-12-17 | 2018-10-23 | 国家电网公司 | A kind of half-bridge topology converter short-circuit protection circuit and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20161029 |
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| CF01 | Termination of patent right due to non-payment of annual fee |