CN201150035Y - Resistance-capacitance step-down power supply circuit with zero crossing detection function - Google Patents
Resistance-capacitance step-down power supply circuit with zero crossing detection function Download PDFInfo
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- CN201150035Y CN201150035Y CNU2007201967351U CN200720196735U CN201150035Y CN 201150035 Y CN201150035 Y CN 201150035Y CN U2007201967351 U CNU2007201967351 U CN U2007201967351U CN 200720196735 U CN200720196735 U CN 200720196735U CN 201150035 Y CN201150035 Y CN 201150035Y
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Abstract
The utility model relates to a resistance capacitance and voltage-reduction power supply circuit with the zero-crossing detection function. The first terminal of alternating current input is connected to the anode of an internal supply circuit, the second terminal is connected to one end of a R1, the other end of the R1 is connected to one end of a R2,the other end of the R2 is connected to the cathode of a D1, the anode of the D1 is connected with the cathode of a C2 and is simultaneously connected to an internal power ground, the anode of the C2 is connected to the anode of the internal power supply, the cathode of a D1 is connected to the anode of a Z1, the cathode of the D1 is connected to the anode of the Z1, the cathode of the Z1 is connected to the first terminal of the alternating current input, a C3 is connected between the anode of the internal power supply circuit and the internal power ground in parallel, a C1 is connected at the both ends of the R1 in parallel, the cathode of a D2 is connected with the anode of the internal power supply, and the anode is connected to the first terminal of the alternating current input, and the cathode of the Z1, and simultaneously, is connected to the I/O port of an single-chip microcomputer. Only a diode is added to the commonly used resistance capacitance and voltage-reduction power supply circuit, the two functions of power supplying and zero-crossing detecting for the single-chip microcomputer can be achieved, the electric circuit is simpler, and the cost is lower.
Description
Technical field
The utility model relates to a kind of resistance-capacitance depressurization power source design that is applied to domestic electric appliances controller, more particularly, relates to a kind of resistance-capacitance depressurization power circuit that the zero passage detection function is arranged.
Background technology
Owing to be subjected to the restriction of cost, the power source design of existing small household appliances controller generally all adopts the mode of resistance-capacitance depressurization, if controller needs the zero passage detection function, then also will add a zero cross detection circuit.As shown in Figure 1, the circuit among the figure in the frame of broken lines is a zero cross detection circuit, and the outer circuit of frame of broken lines is resistance-capacitance depressurization circuit commonly used.
Such circuit connecting mode has used triode, electric capacity and more resistance, and cost is bigger, has reduced the reliability and stability of circuit simultaneously.
The utility model content
The technical problems to be solved in the utility model is, at the more defective of the above-mentioned electronic devices and components of prior art, provides a kind of resistance-capacitance depressurization power circuit with zero passage detection function.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of resistance-capacitance depressurization power circuit with zero passage detection function, first end of electric main input is connected to the anodal VCC of internal electric source, second end of electric main input is connected to an end of first resistance, the other end of first resistance is connected to an end of second resistance, the other end of second resistance is connected to the negative pole of first diode, the positive pole of first diode links to each other with the negative pole of second electric capacity, and be connected to the internal electrical seedbed simultaneously, the positive pole of second electric capacity is connected to the anodal VCC of internal electric source, the negative pole of first diode is connected to the positive pole of voltage stabilizing didoe, the negative pole of voltage stabilizing didoe is connected to first end of electric main input, the 3rd electric capacity is connected in parallel between anodal VCC of internal electric source and the internal electrical seedbed, first electric capacity is connected in parallel on the two ends of first resistance, also comprise first end that is connected electric main input and second diode between the anodal VCC of internal electric source, its negative pole is connected with the anodal VCC of internal electric source, its positive pole is connected to first end of electric main input and the negative pole of voltage stabilizing didoe, and is connected to the I/O mouth of single-chip microcomputer simultaneously.
In the resistance-capacitance depressurization power circuit with zero passage detection function described in the utility model, also comprise the 3rd diode, its positive pole connects the internal electrical seedbed, and negative pole links to each other with the I/O mouth of single-chip microcomputer.
In the resistance-capacitance depressurization power circuit with zero passage detection function described in the utility model, described circuit output square-wave signal carries out zero passage detection to the I/O mouth of single-chip microcomputer.
In the resistance-capacitance depressurization power circuit with zero passage detection function described in the utility model, described electric main is 220 volts or 120 volts.
In the resistance-capacitance depressurization power circuit with zero passage detection function described in the utility model, the cycle of described square wave is the cycle of electric main.
Implement a kind of resistance-capacitance depressurization power circuit of the present utility model with zero passage detection function, has following beneficial effect: on resistance-capacitance depressurization circuit commonly used, only increased a diode, just can be implemented as single-chip microcomputer power supply and two functions of zero passage detection are provided, circuit is simpler, and cost is lower.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of prior art resistance-capacitance depressurization power circuit and zero cross detection circuit;
Fig. 2 is a kind of circuit diagram with resistance-capacitance depressurization power circuit first embodiment of zero passage detection function of the utility model;
Fig. 3 is a kind of circuit diagram with resistance-capacitance depressurization power circuit second embodiment of zero passage detection function of the utility model.
Embodiment
In the utility model, electric main can be 220VAC 50Hz or 120VAC 60Hz etc.
As shown in Figure 2, in a kind of resistance-capacitance depressurization power circuit first embodiment with zero passage detection function of the present utility model, the I/O mouth of single-chip microcomputer has clamping diode over the ground, and electric main is 220V.
One end of electric main input is connected to the positive pole of diode D2, the other end of electric main input is connected to an end of resistance R 1, the other end of resistance R 1 is connected to an end of resistance R 2, the other end of resistance R 2 is connected to the negative pole of diode D1, capacitor C 1 is connected in parallel on the two ends of resistance R 1, the positive pole of diode D2 is connected to the I/O mouth of single-chip microcomputer, the negative pole of diode D2 is connected to the positive pole of capacitor C 2, and be connected to the anodal VCC of internal electric source simultaneously, the negative pole of capacitor C 2 links to each other with the positive pole of diode D1, and be connected to the internal electrical seedbed simultaneously, the negative pole of diode D1 is connected to the positive pole of voltage stabilizing didoe Z1, the negative pole of diode Z1 is connected to the positive pole of diode D2, and capacitor C 3 is connected in parallel between anodal VCC of internal electric source and the internal electrical seedbed.
Wherein capacitor C 1 is a capacitance decompression, and resistance R 1 is capacitor C 1 discharge, and resistance R 2 prevents rush of current, and diode D1 is used for rectification.
(1) when the positive half cycle of 220V electric main (on negative just down) input, the negative pole output voltage V 1+0.7V of voltage stabilizing didoe Z1, wherein V1 is the voltage stabilizing of voltage-stabiliser tube Z1,0.7V be the forward voltage drop tube of diode D1, the voltage at C2 two ends is constantly raise for capacitor C 2 chargings by diode D2 simultaneously, until being elevated to V1-0.7V=VCC, be used for powering to Single Chip Microcomputer (SCM) system.
(2) when the negative half period of 220V electric main (just going up negative down) input, because the reverse inhibition of diode D2, make capacitor C 2 not continue to keep VCC by voltage stabilizing didoe Z1 discharge, because the existence of load, VCC has the fluctuation of 0.5V, can satisfy the work of Single Chip Microcomputer (SCM) system, because this moment, the voltage at Z1 two ends was just to go up down to bear, so low-voltage of the negative electrode output-0.7V-0.7V=-1.4V of Z1, wherein previous-0.7V is the forward voltage drop tube of diode D1, and back one-0.7V is the forward voltage drop tube of voltage stabilizing didoe Z1.
(3) when 220V electric main positive-negative half-cycle alternately is carried in the foregoing circuit left end, just have duty ratio at the negative pole of voltage stabilizing didoe Z1 and be approximately 50% square wave, the cycle of square wave is the cycle of electric main, when electric main frequency 50Hz, the cycle of square wave is 20mS, by above-mentioned (1), (2) as can be known, the high level of square wave is V1+0.7V, and low level is-1.4V.
When the I/O mouth of single-chip microcomputer has over the ground clamping diode, the square-wave signal in above-mentioned (3) is directly inputted to the single-chip processor i/o mouth as the zero passage detection signal.
As shown in Figure 3, in a kind of resistance-capacitance depressurization power circuit second embodiment with zero passage detection function of the present utility model, the I/O mouth of single-chip microcomputer does not have clamping diode over the ground, and therefore the negative pole end at voltage stabilizing didoe pipe Z1 increases a clamping diode over the ground.
One end of 220V electric main input is connected to the positive pole of diode D2, the other end of 220V electric main input is connected to an end of resistance R 1, the other end of resistance R 1 is connected to an end of resistance R 2, the other end of resistance R 2 is connected to the negative pole of diode D1, capacitor C 1 is connected in parallel on the two ends of resistance R 1, the positive pole of diode D2 is connected to the I/O mouth of single-chip microcomputer, the negative pole of diode D2 is connected to the positive pole of capacitor C 2, and be connected to the anodal VCC of internal electric source simultaneously, the negative pole of capacitor C 2 links to each other with the positive pole of diode D1, and be connected to the internal electrical seedbed simultaneously, the negative pole of diode D1 is connected to the positive pole of voltage stabilizing didoe Z1, the negative pole of diode Z1 is connected to the positive pole of diode D2, and capacitor C 3 is connected in parallel between anodal VCC of internal electric source and the internal electrical seedbed.Negative pole end at Z1 increases a clamping diode D3 over the ground, and the positive pole of diode D3 connects the internal electrical seedbed, and the negative pole of diode D3 is connected to the I/O mouth of single-chip microcomputer.
Its operation principle is identical with first embodiment, and can produce high level is V1+0.7V, and low level is-square wave of 1.4V, then this square-wave signal is input to the single-chip processor i/o mouth as the zero passage detection signal.
Claims (5)
1, a kind of resistance-capacitance depressurization power circuit with zero passage detection function, first end of electric main input is connected to the anodal VCC of internal electric source, second end of electric main input is connected to an end of first resistance, the other end of first resistance is connected to an end of second resistance, the other end of second resistance is connected to the negative pole of first diode, the positive pole of first diode links to each other with the negative pole of second electric capacity, and be connected to the internal electrical seedbed simultaneously, the positive pole of second electric capacity is connected to the anodal VCC of internal electric source, the negative pole of first diode is connected to the positive pole of voltage stabilizing didoe, the negative pole of voltage stabilizing didoe is connected to first end of electric main input, the 3rd electric capacity is connected in parallel between anodal VCC of internal electric source and the internal electrical seedbed, first electric capacity is connected in parallel on the two ends of first resistance, it is characterized in that, also comprise first end that is connected electric main input and second diode between the anodal VCC of internal electric source, its negative pole is connected with the anodal VCC of internal electric source, its positive pole is connected to first end of electric main input and the negative pole of voltage stabilizing didoe, and is connected to the I/O mouth of single-chip microcomputer simultaneously.
2, the resistance-capacitance depressurization power circuit with zero passage detection function according to claim 1 is characterized in that, also comprise the 3rd diode, its positive pole connects the internal electrical seedbed, and negative pole links to each other with the I/O mouth of single-chip microcomputer.
According to each described resistance-capacitance depressurization power circuit in claim 1 or 2, it is characterized in that 3, described circuit output square-wave signal carries out zero passage detection to the I/O mouth of single-chip microcomputer with zero passage detection function.
4, the resistance-capacitance depressurization power circuit with zero passage detection function according to claim 3 is characterized in that, described electric main is 220 volts or 120 volts.
5, the resistance-capacitance depressurization power circuit with zero passage detection function according to claim 4 is characterized in that, the cycle of described square wave is the cycle of electric main.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201967351U CN201150035Y (en) | 2007-12-29 | 2007-12-29 | Resistance-capacitance step-down power supply circuit with zero crossing detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201967351U CN201150035Y (en) | 2007-12-29 | 2007-12-29 | Resistance-capacitance step-down power supply circuit with zero crossing detection function |
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| CN201150035Y true CN201150035Y (en) | 2008-11-12 |
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| CNU2007201967351U Expired - Fee Related CN201150035Y (en) | 2007-12-29 | 2007-12-29 | Resistance-capacitance step-down power supply circuit with zero crossing detection function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013044602A1 (en) * | 2011-09-30 | 2013-04-04 | 海信科龙电器股份有限公司 | Zero-crossing signal detection circuit |
| CN106324411A (en) * | 2015-07-02 | 2017-01-11 | 国网山东省电力公司潍坊供电公司 | Intelligent tester for metering wiring of secondary circuit |
| CN107241831A (en) * | 2017-07-07 | 2017-10-10 | 厦门芯阳科技股份有限公司 | The method and circuit of a kind of two kinds of lamps of single-chip I/O mouth driving |
| CN111736009A (en) * | 2020-07-21 | 2020-10-02 | 追创科技(苏州)有限公司 | Zero-crossing detection circuit and electronic equipment |
| CN115453187A (en) * | 2022-09-14 | 2022-12-09 | 联桥科技有限公司 | Non-isolated alternating voltage zero-crossing detection circuit |
-
2007
- 2007-12-29 CN CNU2007201967351U patent/CN201150035Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013044602A1 (en) * | 2011-09-30 | 2013-04-04 | 海信科龙电器股份有限公司 | Zero-crossing signal detection circuit |
| CN106324411A (en) * | 2015-07-02 | 2017-01-11 | 国网山东省电力公司潍坊供电公司 | Intelligent tester for metering wiring of secondary circuit |
| CN107241831A (en) * | 2017-07-07 | 2017-10-10 | 厦门芯阳科技股份有限公司 | The method and circuit of a kind of two kinds of lamps of single-chip I/O mouth driving |
| CN111736009A (en) * | 2020-07-21 | 2020-10-02 | 追创科技(苏州)有限公司 | Zero-crossing detection circuit and electronic equipment |
| CN115453187A (en) * | 2022-09-14 | 2022-12-09 | 联桥科技有限公司 | Non-isolated alternating voltage zero-crossing detection circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081112 Termination date: 20161229 |