CN2870333Y - Clock power-supply switch-over circuit and television set with same - Google Patents
Clock power-supply switch-over circuit and television set with same Download PDFInfo
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- CN2870333Y CN2870333Y CNU2006200819733U CN200620081973U CN2870333Y CN 2870333 Y CN2870333 Y CN 2870333Y CN U2006200819733 U CNU2006200819733 U CN U2006200819733U CN 200620081973 U CN200620081973 U CN 200620081973U CN 2870333 Y CN2870333 Y CN 2870333Y
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- crystal oscillator
- power supply
- circuit
- power
- connects
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Abstract
The utility model discloses a clock power supply commutation circuit and a TV equipped with the commutation circuit, comprising a DC power supply, a MCU, a crystal oscillator and a switch control circuit which receives command signals sent from MCU and controls switch on/off of the current power supply and crystal oscillator power supply according to high/low level state of the command signals. A switching circuit controlled and guided by MCU is connected between the power end of the crystal oscillator and the DC output end. When the circuit is on, some idle crystal oscillator will be turned off to avoid electromagnetic radiation generated thereby. The simple circuit structure and relatively low cost can reduce the impact of electromagnetic radiation on the circuit, and ensure the liability and stability of the circuit of the TV set. The utility model can be applied in any real-time clock control circuit and has great significance in practical application.
Description
Technical field
The utility model belongs to the TV set circuit technical field, specifically, relates to a kind of being applied in the TV set circuit, realizes the control circuit that its real-time clock power supply is switched.
Background technology
Along with development of electronic technology, clock has played very big effect in digital integrated circuit, the transmission of various digital signals needs certain clock frequency, this clock frequency need be produced by clock oscillator, the MCU processor also need come frequency division by clock frequency, and this becomes more and more universal with regard to the application that makes clock.But the problem that causes thus is that electromagnetic radiation is very serious, thereby has reduced the stability of circuit operation and the reliability of work.
Summary of the invention
The electromagnetic interference problem that the utility model brings to circuit system for the universal use that solves clock oscillator in the prior art, a kind of novel clock power commutation circuit is provided, this circuit when work with some use less than clock oscillator turn off, thereby avoided consequent EMC problem, improved the stability of circuit operation.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of clock power commutation circuit and television set with described commutation circuit, comprise DC power supply, controller, crystal oscillator and an ON-OFF control circuit, described ON-OFF control circuit receives the command signal that controller sends, and is communicated with the power end of crystal oscillator or disconnects according to the described DC power supply of high-low level State Control of command signal.
As the further qualification to technique scheme, the trigger end of described ON-OFF control circuit connects the command signal output of controller, and the gating end is connected between the power end of described DC power supply and crystal oscillator.Described ON-OFF control circuit mainly is formed by connecting by a NPN type triode and a P channel MOS tube.Wherein, the base stage of NPN type triode connects the I/O mouth of controller, grounded emitter, and collector electrode connects the grid of described P channel MOS tube on the one hand through a divider resistance, connects described DC power supply through another divider resistance on the other hand; The source electrode of described P channel MOS tube connects described DC power supply, and drain electrode connects the power end of described crystal oscillator through a LC filter network.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is controlled the switching circuit of conducting by be connected one between the output of the power end of crystal oscillator and DC power supply by MCU, when circuit working, with some use less than crystal oscillator turn off, thereby avoid consequent electromagnetic radiation, reduced the influence of electromagnetic interference with simple circuit configuration and low-down cost to circuit, the stability and the reliability of TV set circuit work have been guaranteed, can be widely used in all real-time timepiece control circuits, have significant practical application meaning.
Description of drawings
Fig. 1 is the schematic diagram of the utility model television set clock power commutation circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
The utility model increases simple ON-OFF control circuit on the basis of existing television set clock circuit, when not needing crystal oscillator work, by being connected of MCU output instruction signal control switch circuitry cuts DC power supply and crystal oscillator power end, thereby shutoff crystal oscillator, avoid consequent electromagnetic interference, its physical circuit syndeton is referring to shown in Figure 1.
Among Fig. 1, ON-OFF control circuit is connected realization by a NPN type triode Q903 with an IRF7314 switch chip U902A.Wherein, include the P-channel field-effect transistor (PEFT) pipe in the inside of IRF7314 switch chip U902A.The I/O mouth of MUC connects the base stage of NPN type triode Q903 through resistance R 915, the grounded emitter of triode Q903, collector electrode connects the grid G of switch chip U902A on the one hand through divider resistance R916, on the other hand through another divider resistance R917 connection+3.3V DC power supply.The source S of described switch chip U902A connects described+3.3V DC power supply, and the filter network that drain D is formed via inductance L 23 and capacitor C 113 is connected the power end VCC of crystal oscillator X2.
When system needed clock frequency, MCU was by its I/O mouth output high-level control signal, affacted the base stage of NPN type triode Q903 through resistance R 915, controlled its conducting.At this moment ,+3.3V DC power supply is by the dividing potential drop of resistance R 916 and R917, makes voltage between the GS reach the cut-in voltage of IRF7314 switch chip U902A internal fet, and at this moment ,+3.3V DC power supply is given crystal oscillator X2 power supply.After crystal oscillator X2 has power supply, the crystal oscillator starting oscillation, by the clock square-wave signal of its output OUT output 27MHz, this square-wave signal is used for the processing of subsequent conditioning circuit digital signal.
When system's clock work when not required, MCU is by its I/O mouth output low level control signal, control triode Q903 and field effect transistor U902A end, and then cut-out+3.3V DC power supply is to the power supply of crystal oscillator X2, turn-off crystal oscillator X2, avoid of the harmful effect of the electromagnetic interference of crystal oscillator generation circuit system with this.
Use proof through reality, adopt the switch control of IRF7314 integrated circuit as the MCU clock power, circuit is simple, and control is convenient, conduction impedance is low, and the current flowing rate is big, and maximum can reach 3A, can effectively reduce unnecessary electromagnetic interference, make circuit working more stable, move more reliable.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (8)
1. clock power commutation circuit, comprise DC power supply, controller and crystal oscillator, it is characterized in that: in described clock power commutation circuit, also comprise an ON-OFF control circuit, described ON-OFF control circuit receives the command signal that controller sends, and is communicated with the power end of crystal oscillator or disconnects according to the described DC power supply of high-low level State Control of command signal.
2. clock power commutation circuit according to claim 1 is characterized in that: the trigger end of described ON-OFF control circuit connects the command signal output of controller, and the gating end is connected between the power end of described DC power supply and crystal oscillator.
3. clock power commutation circuit according to claim 2, it is characterized in that: in described ON-OFF control circuit, include a NPN type triode and a P channel MOS tube, wherein, the base stage of NPN type triode connects the I/O mouth of controller, grounded emitter, collector electrode connects the grid of described P channel MOS tube on the one hand through a divider resistance, connects described DC power supply through another divider resistance on the other hand; The source electrode of described P channel MOS tube connects described DC power supply, and drain electrode connects the power end of crystal oscillator.
4. clock power commutation circuit according to claim 3 is characterized in that: be connected with a LC filter network between the power end of the drain electrode of described P channel MOS tube and crystal oscillator.
5. television set with the described clock power commutation circuit of claim 1, comprise DC power supply, controller and crystal oscillator, it is characterized in that: in described clock power commutation circuit, also comprise an ON-OFF control circuit, described ON-OFF control circuit receives the command signal that controller sends, and is communicated with the power end of crystal oscillator or disconnects according to the described DC power supply of high-low level State Control of command signal.
6. television set according to claim 5 is characterized in that: the trigger end of described ON-OFF control circuit connects the command signal output of controller, and the gating end is connected between the power end of described DC power supply and crystal oscillator.
7. television set according to claim 6, it is characterized in that: in described ON-OFF control circuit, include a NPN type triode and a P channel MOS tube, wherein, the base stage of NPN type triode connects the I/O mouth of controller, grounded emitter, collector electrode connects the grid of described P channel MOS tube on the one hand through a divider resistance, connects described DC power supply through another divider resistance on the other hand; The source electrode of described P channel MOS tube connects described DC power supply, and drain electrode connects the power end of crystal oscillator.
8. television set according to claim 7 is characterized in that: be connected with a LC filter network between the power end of the drain electrode of described P channel MOS tube and crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200819733U CN2870333Y (en) | 2006-03-15 | 2006-03-15 | Clock power-supply switch-over circuit and television set with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200819733U CN2870333Y (en) | 2006-03-15 | 2006-03-15 | Clock power-supply switch-over circuit and television set with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2870333Y true CN2870333Y (en) | 2007-02-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200819733U Expired - Fee Related CN2870333Y (en) | 2006-03-15 | 2006-03-15 | Clock power-supply switch-over circuit and television set with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2870333Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109147678A (en) * | 2018-09-14 | 2019-01-04 | 联想(北京)有限公司 | Control method and electronic equipment |
| CN110289815A (en) * | 2019-06-24 | 2019-09-27 | 北京无线电计量测试研究所 | A kind of crystal oscillator and crystal oscillator group |
-
2006
- 2006-03-15 CN CNU2006200819733U patent/CN2870333Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109147678A (en) * | 2018-09-14 | 2019-01-04 | 联想(北京)有限公司 | Control method and electronic equipment |
| CN110289815A (en) * | 2019-06-24 | 2019-09-27 | 北京无线电计量测试研究所 | A kind of crystal oscillator and crystal oscillator group |
| CN110289815B (en) * | 2019-06-24 | 2023-05-16 | 北京无线电计量测试研究所 | Crystal oscillator and crystal oscillator group |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070214 Termination date: 20110315 |