CN103840658A - Power switch circuit of time calibration instrument - Google Patents
Power switch circuit of time calibration instrument Download PDFInfo
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- CN103840658A CN103840658A CN201410102185.7A CN201410102185A CN103840658A CN 103840658 A CN103840658 A CN 103840658A CN 201410102185 A CN201410102185 A CN 201410102185A CN 103840658 A CN103840658 A CN 103840658A
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- mc34063a
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Abstract
The invention discloses a power switch circuit of a time calibration instrument. The power switch circuit comprises a chip MC34063A, wherein a DRC lead and an SWC lead of the chip MC34063A are connected and are connected with a grid electrode of a field effect tube through a resistor R4, a VCC lead of the chip MC34063A is connected with a grounded capacitor C1 and a grounded capacitor C2, a CII lead of the chip MC34063A is connected with a voltage distribution circuit, a TC lead of the chip MC34063A is connected with a grounded capacitor C3, an IPK lead of the chip MC34063A is connected with a source electrode of the field effect tube, a resistor R5 is connected between the grid electrode and the source electrode of the field effect tube, a drain electrode of the field effect tube is connected to a cathode of a diode, an anode of the diode is grounded, the drain electrode of the field effect tube is connected to a power supply through an inductor, and the common ends of the inductor and the power supply are connected with a grounded capacitor C4 and a grounded capacitor C5. The power switch circuit has the advantages of being high in anti-interference capacity and output stability.
Description
Technical field
The present invention relates to a kind of mains switch, relate in particular a kind of time check instrument power switch circuit.
Background technology
Time check instrument, for the precision of checking time, is used for some and counts field accurately, as rocket launching, satellite navigation, astronomical clock etc. need the field that time precision is high.Mains switch is the vitals of time check instrument.Mains switch is Switching Power Supply.Because the instructions for use degree of time check instrument is higher, in use, external interference easily impacts the service precision of time check instrument, especially in mains switch department, its mains switch control switch pipe turn on and off time ratio, to maintain regulated output voltage, because switching tube generally adopts MOSFET, the impact of opening shutoff and be very easily subject to external interference of its switching tube, so that affect the output stability of mains switch.
Summary of the invention
The invention provides a kind of time check instrument power switch circuit, its antijamming capability is strong, and output stability is high.
For solving above-mentioned technical problem, the present invention by the following technical solutions:
Time check instrument power switch circuit, it comprises chip MC34063A, the DRC pin of described chip MC34063A is connected with SWC pin and is connected to by resistance R 4 on the grid of field effect transistor, on the VCC pin of described chip MC34063A, be connected with ground capacity C1 and ground capacity C2, the CII pin of described chip MC34063A is connected on bleeder circuit, the SWE pin of described chip MC34063A and the equal ground connection of GND pin, on the TC pin of described chip MC34063A, be connected with ground capacity C3, the IPK pin of described chip MC34063A is connected on the source electrode of field effect transistor and by resistance R 1 and is connected with power supply, between the grid of described field effect and source electrode, be connected with resistance R 5, the drain electrode of described field effect transistor is connected on the negative electrode of diode, the plus earth of described diode, the drain electrode of described field effect transistor is connected on power supply by inductance, described inductance and the common port of power supply are connected with ground capacity C4 and ground capacity C5.
Further technical scheme is:
As preferably, described bleeder circuit comprises resistance R 2 and resistance R 3, described resistance R 2 and resistance R 3 are in series, the non-common port of described resistance R 3 is connected on power supply, the non-common end grounding of described resistance R 2, described resistance R 2 and the common port of resistance R 3 are connected on the CII pin of chip MC34063A.
Further, the resistance value ratio of described resistance R 2 and resistance R 3 is 3:1.
Further, described resistance C1 and resistance C4 are polar capacitor.
Compared with prior art, the invention has the beneficial effects as follows: the present invention utilizes chip MC34063A to be connected two ground capacities with peripheral circuit and at power end, make the antijamming capability of this mains switch strong, make turning on and off of field effect transistor not be vulnerable to the impact of external interference, ensure the stability of output, i.e. the reliability of time tester.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.Embodiments of the present invention include but not limited to the following example.
[embodiment]
Time check instrument power switch circuit as shown in Figure 1, it comprises chip MC34063A, the DRC pin of described chip MC34063A is connected with SWC pin and is connected to by resistance R 4 on the grid of field effect transistor, on the VCC pin of described chip MC34063A, be connected with ground capacity C1 and ground capacity C2, the CII pin of described chip MC34063A is connected on bleeder circuit, the SWE pin of described chip MC34063A and the equal ground connection of GND pin, on the TC pin of described chip MC34063A, be connected with ground capacity C3, the IPK pin of described chip MC34063A is connected on the source electrode of field effect transistor and by resistance R 1 and is connected with power supply, between the grid of described field effect and source electrode, be connected with resistance R 5, the drain electrode of described field effect transistor is connected on the negative electrode of diode, the plus earth of described diode, the drain electrode of described field effect transistor is connected on power supply by inductance, described inductance and the common port of power supply are connected with ground capacity C4 and ground capacity C5.Chip MC34063A is made up of the controlled oscillator of pedestal generator, comparator, the duty ratio with temperature compensation function, rest-set flip-flop and High-current output switch etc.The capacitance size of capacitor C 3 determines the frequency of oscillation height of the oscillator of chip MC34063A, determines the make-and-break time of field effect transistor.IPK pin is for monitoring the peak current of field effect transistor, to control the pulse output of oscillator.CII pin, by bleeder circuit service voltage, utilizes bleeder circuit to CII pin supply circuit, can ensure the stable of magnitude of voltage.The comparator that the internal reference voltage of the voltage of CII pin and chip MC34063A is sent into the inside of chip MC34063A simultaneously carries out voltage ratio, when CII pin voltage is during lower than internal reference voltage, comparator is output as leaping voltage, open the control gate of rest-set flip-flop, rest-set flip-flop is under the driving of oscillator, drive field effect transistor conducting, reach the object of automatic control.When CII pin voltage is during higher than internal reference voltage, the control gate of rest-set flip-flop is locked, field effect transistor cut-off.The VCC pin of chip MC34063A is connected on power supply, utilizes two ground capacities, and capacitor C 1 and capacitor C 2 play decoupling effect, reduces the harmful effect of the internal resistance of source to load, and identical, capacitor C 4 and capacitor C 5 also play the object of antagonism High-frequency Interference.Diode pair voltage carries out clamper, and field effect transistor is protected.
Described bleeder circuit comprises resistance R 2 and resistance R 3, described resistance R 2 and resistance R 3 are in series, the non-common port of described resistance R 3 is connected on power supply, the non-common end grounding of described resistance R 2, described resistance R 2 and the common port of resistance R 3 are connected on the CII pin of chip MC34063A.The dividing potential drop of utilizing resistance R 2 and resistance R 3, its circuit structure is simple, with low cost, also makes voltage stabilization.
Described resistance R 2 and the resistance value ratio of resistance R 3 are 3:1.At power end, for its voltage that 5V is provided, in order to meet the voltage request of CII pin, avoid the extra voltage source that provides, the resistance value ratio of resistance R 2 and resistance R 3 is 3:1.
Described resistance C1 and resistance C4 are polar capacitor.Adopt the cooperation of polar capacitor and general electric capacity, can improve the ability of antagonism High-frequency Interference.And the capacitance of polar capacitor is larger, the ability that suppresses temperature drift is stronger.
In the present embodiment, as one group of preferred scheme, it is the resistance of 33 ohm, 3.6 kilohms, 1.2 kilohms, 470 ohm, 1 kilohm that resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5 can adopt respectively resistance; It is the electric capacity of 100 μ F, 0.1 μ F, 470pF, 470 μ F, 0.1 μ F that capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5 can adopt capacitance.Diode can adopt IN5817; Field effect transistor can adopt FDD4243.Through emulation, adopt the electronic device of above-mentioned specification, but the performance of circuit reaches optimum.
Be as mentioned above embodiments of the invention.The present invention is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present invention, and every have identical or close technical scheme with the present invention, within all falling into protection scope of the present invention.
Claims (4)
1. time check instrument power switch circuit, it is characterized in that: it comprises chip MC34063A, the DRC pin of described chip MC34063A is connected with SWC pin and is connected to by resistance R 4 on the grid of field effect transistor, on the VCC pin of described chip MC34063A, be connected with ground capacity C1 and ground capacity C2, the CII pin of described chip MC34063A is connected on bleeder circuit, the SWE pin of described chip MC34063A and the equal ground connection of GND pin, on the TC pin of described chip MC34063A, be connected with ground capacity C3, the IPK pin of described chip MC34063A is connected on the source electrode of field effect transistor and by resistance R 1 and is connected with power supply, between the grid of described field effect and source electrode, be connected with resistance R 5, the drain electrode of described field effect transistor is connected on the negative electrode of diode, the plus earth of described diode, the drain electrode of described field effect transistor is connected on power supply by inductance, described inductance and the common port of power supply are connected with ground capacity C4 and ground capacity C5.
2. time check instrument power switch circuit according to claim 1, it is characterized in that: described bleeder circuit comprises resistance R 2 and resistance R 3, described resistance R 2 and resistance R 3 are in series, the non-common port of described resistance R 3 is connected on power supply, the non-common end grounding of described resistance R 2, described resistance R 2 and the common port of resistance R 3 are connected on the CII pin of chip MC34063A.
3. time check instrument power switch circuit according to claim 2, is characterized in that: described resistance R 2 and the resistance value ratio of resistance R 3 are 3:1.
4. according to the time check instrument power switch circuit described in claim 1 or 3, it is characterized in that: described resistance C1 and resistance C4 are polar capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102185.7A CN103840658A (en) | 2014-03-19 | 2014-03-19 | Power switch circuit of time calibration instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410102185.7A CN103840658A (en) | 2014-03-19 | 2014-03-19 | Power switch circuit of time calibration instrument |
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| CN103840658A true CN103840658A (en) | 2014-06-04 |
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| CN201410102185.7A Pending CN103840658A (en) | 2014-03-19 | 2014-03-19 | Power switch circuit of time calibration instrument |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457782Y (en) * | 2000-03-13 | 2001-10-31 | 阳仲荣 | Multi-way isolation DC change powre source for instrument |
| CN2468231Y (en) * | 2001-02-13 | 2001-12-26 | 赵俊华 | Real-time network terminal |
| CN2704235Y (en) * | 2004-05-20 | 2005-06-15 | 张少华 | Heating shoes |
| CN2759193Y (en) * | 2004-12-29 | 2006-02-22 | 刘望来 | Ultrasonic birds dispelling device with low power consumption |
| CN201134684Y (en) * | 2007-08-22 | 2008-10-15 | 谭信威 | Electronic switch output type solar charging equipment |
| CN102284141A (en) * | 2011-05-31 | 2011-12-21 | 郎鸿志 | Carotid plaque ultrasonic treatment apparatus |
-
2014
- 2014-03-19 CN CN201410102185.7A patent/CN103840658A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457782Y (en) * | 2000-03-13 | 2001-10-31 | 阳仲荣 | Multi-way isolation DC change powre source for instrument |
| CN2468231Y (en) * | 2001-02-13 | 2001-12-26 | 赵俊华 | Real-time network terminal |
| CN2704235Y (en) * | 2004-05-20 | 2005-06-15 | 张少华 | Heating shoes |
| CN2759193Y (en) * | 2004-12-29 | 2006-02-22 | 刘望来 | Ultrasonic birds dispelling device with low power consumption |
| CN201134684Y (en) * | 2007-08-22 | 2008-10-15 | 谭信威 | Electronic switch output type solar charging equipment |
| CN102284141A (en) * | 2011-05-31 | 2011-12-21 | 郎鸿志 | Carotid plaque ultrasonic treatment apparatus |
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Application publication date: 20140604 |