CN203072203U - Linear constant-current power supply - Google Patents
Linear constant-current power supply Download PDFInfo
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- CN203072203U CN203072203U CN 201220695702 CN201220695702U CN203072203U CN 203072203 U CN203072203 U CN 203072203U CN 201220695702 CN201220695702 CN 201220695702 CN 201220695702 U CN201220695702 U CN 201220695702U CN 203072203 U CN203072203 U CN 203072203U
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Abstract
The utility model relates to a linear constant-current power supply. The power supply comprises: a power-frequency transformer, which is used for converting a high voltage into a low voltage; a rectifier filter circuit, which is electrically connected with the output terminal of the power-frequency transformer and is used for carrying out rectification and filtering on the voltage outputted by the power-frequency transformer; a control circuit, which is connected with the output terminal of the rectifier filter circuit and outputs a pulse width modulation signal enabling the output voltage to remain stable; an output circuit, which is connected to the output terminal of the control circuit and provides a stable work voltage for a load according to the control signal provided by the control circuit; and a sampling feedback circuit, which is connected between the output terminal of the output circuit and the control circuit and carries out sampling on the output voltage of the output circuit and then provides the sampled output voltage for the control circuit. According to the utility model, the stability of the output voltage can be realized; and the defect of low efficiency of the common voltage stabilization circuit is overcome.
Description
Technical field
The utility model relates to a kind of linear constant voltage source.
Background technology
Existing lamp ornaments lighting progressively is converted to led light source by traditional incandescent lamp fluorescent lamp etc., and the problem of bringing thus is exactly the requirement of power supply adaptor, is exactly the stable of electric current, and existing linear power supply is because the characteristics of itself have determined the unsteadiness of output voltage.
Summary of the invention
The utility model provides a kind of linear constant voltage source at the deficiencies in the prior art, and the utility model can reach the stable of output voltage, and has overcome the problem of the inefficiency of common voltage stabilizing circuit.
The utility model is achieved through the following technical solutions:
Linear constant voltage source comprises the Industrial Frequency Transformer that high voltage is converted to low-voltage; And
The current rectifying and wave filtering circuit that is electrically connected with the Industrial Frequency Transformer output, the voltage that Industrial Frequency Transformer is exported carries out rectification and filtering; And
The control circuit that is connected with rectification filter circuit output end is exported one and is made output voltage keep stable pulse-width signal; And
Be connected in the output circuit of control circuit output, the control signal according to control circuit provides provides stable operating voltage to load; And
Be connected in the sampling feedback circuit between output circuit output and the control circuit, offer control circuit behind the output voltage of this sampling feedback circuit sampling output circuit.
Adopted such scheme, high voltage carries out voltage transitions by Industrial Frequency Transformer, and the inflow current rectifying and wave filtering circuit carries out rectification and filtering obtains direct current, and this direct current flows into control circuit and carries out constant voltage control, exports by output circuit.Wherein key is that pulse-width modulation (PWM control) function by control circuit changes duty and recently changes the voltage fluctuation that causes because of input voltage and output loading, reaches stablizing of output voltage, thereby has solved the problem of the inefficiency of common voltage stabilizing circuit.
Further, control circuit is the MC34063 cake core.It is a kind of function admirable, the integrated pwm chip of monolithic multiple functional and highly versatile that control circuit has adopted integrated control circuit, and by the feedback of sampling feedback circuit, the voltage of control output is stable to be protected with output overcurrent.
Further, described output circuit comprises energy storage inductor, filter capacitor and diode, one end of energy storage inductor connects the output of control circuit, the other end of energy storage inductor is connected with an end of filter capacitor, the anode tap ground connection of the other end of filter capacitor and diode, the cathode terminal of diode are connected the control circuit output with energy storage inductor a end connects.When control circuit output voltage during to output circuit, the voltage of square wave accumulates on the energy storage inductor, by filter capacitor the electric capacity on the energy storage inductor is carried out filtering, obtains the output voltage of triangular wave, and this voltage offers load.If output voltage is not in steady state, sampling feedback circuit feeds back to control circuit with the voltage of sampling, and control circuit changes the pulse-width signal of output, changes the duty ratio of square-wave voltage, thereby makes output voltage remain on steady state.
Further, also comprise a reducible Thermal Cutoffs that is connected in the Industrial Frequency Transformer input.Input at Industrial Frequency Transformer is connected in series the reducible Thermal Cutoffs with PTC function, when the self-protection of power supply in the mistake thermal environment, prevents the overheated burning of power supply, can utilize again after solving fault.But guarantee the reuse of product, improved resource utilization.
Below in conjunction with accompanying drawing and the formula of specifically implementing the utility model is described further.
Description of drawings
Fig. 1 is circuit block diagram of the present utility model;
Fig. 2 is the circuit theory diagrams of Fig. 1;
Embodiment
With reference to Fig. 1, linear constant voltage source of the present utility model comprises input circuit 1, but input circuit 1 is a reset temperature fuse, but high-tension electricity is exported through behind the reset temperature fuse of input circuit 1.And the Industrial Frequency Transformer 2 that high voltage is converted to low-voltage.And the current rectifying and wave filtering circuit 3 that is electrically connected with the Industrial Frequency Transformer output, the voltage of Industrial Frequency Transformer output is carried out rectification and filtering, described current rectifying and wave filtering circuit D1 is made up of unidirectional full-wave rectification bridge and filter capacitor C1, and filter capacitor is connected in the output of unidirectional full-wave rectification bridge.And the control circuit 4 that is connected with rectification filter circuit output end, to export one and make output voltage keep stable pulse-width signal, control circuit is the MC34063 cake core.And the output circuit 5 that is connected in the control circuit output, the control signal according to control circuit 4 provides provides stable operating voltage to load.Output circuit 5 comprises energy storage inductor L1, filter capacitor C3 and diode D2, the end of energy storage inductor L1 connects the output of control circuit 4, the other end of energy storage inductor L1 is connected with the end of filter capacitor C1, the anode tap ground connection of the other end of filter capacitor C1 and diode D2, the cathode terminal of diode D2 are connected the control circuit output with energy storage inductor L1 a end connects.And be connected in sampling feedback circuit 6 between output circuit output and the control circuit, and offering control circuit 6 behind the output voltage of this sampling feedback circuit sampling output circuit, sampling feedback circuit is a sample resistance R2.
Claims (6)
1. linear constant voltage source is characterized in that, comprises the Industrial Frequency Transformer that high voltage is converted to low-voltage; And
The current rectifying and wave filtering circuit that is electrically connected with the Industrial Frequency Transformer output, the voltage that Industrial Frequency Transformer is exported carries out rectification and filtering; And
The control circuit that is connected with rectification filter circuit output end is exported one and is made output voltage keep stable pulse-width signal; And
Be connected in the output circuit of control circuit output, the control signal according to control circuit provides provides stable operating voltage to load; And
Be connected in the sampling feedback circuit between output circuit output and the control circuit, offer control circuit behind the output voltage of this sampling feedback circuit sampling output circuit.
2. linear constant voltage source according to claim 1 is characterized in that, described current rectifying and wave filtering circuit is made up of unidirectional full-wave rectification bridge and filter capacitor, and filter capacitor is connected in the output of unidirectional full-wave rectification bridge.
3. linear constant voltage source according to claim 1 is characterized in that, control circuit is the MC34063 cake core.
4. linear constant voltage source according to claim 1, it is characterized in that, described output circuit comprises energy storage inductor, filter capacitor and diode, one end of energy storage inductor connects the output of control circuit, the other end of energy storage inductor is connected with an end of filter capacitor, the anode tap ground connection of the other end of filter capacitor and diode, the cathode terminal of diode are connected the control circuit output with energy storage inductor a end connects.
5. linear constant voltage source according to claim 1 is characterized in that, described sampling feedback circuit is a sample resistance.
6. according to any described linear constant voltage source of claim 1 to 5, it is characterized in that, also comprise a reducible Thermal Cutoffs that is connected in the Industrial Frequency Transformer input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220695702 CN203072203U (en) | 2012-12-16 | 2012-12-16 | Linear constant-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220695702 CN203072203U (en) | 2012-12-16 | 2012-12-16 | Linear constant-current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203072203U true CN203072203U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220695702 Expired - Fee Related CN203072203U (en) | 2012-12-16 | 2012-12-16 | Linear constant-current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203072203U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110264693A (en) * | 2019-07-03 | 2019-09-20 | 南京荟学智能科技有限公司 | A kind of device and method that wired dry contact signal is converted to wireless signal transmission |
-
2012
- 2012-12-16 CN CN 201220695702 patent/CN203072203U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110264693A (en) * | 2019-07-03 | 2019-09-20 | 南京荟学智能科技有限公司 | A kind of device and method that wired dry contact signal is converted to wireless signal transmission |
| CN110264693B (en) * | 2019-07-03 | 2020-12-25 | 南京荟学智能科技有限公司 | Device and method for converting wired main contact point signal into wireless signal for transmission |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130717 Termination date: 20161216 |