CN204442187U - A kind of safety low-pressure DC power supply - Google Patents
A kind of safety low-pressure DC power supply Download PDFInfo
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- CN204442187U CN204442187U CN201520145609.8U CN201520145609U CN204442187U CN 204442187 U CN204442187 U CN 204442187U CN 201520145609 U CN201520145609 U CN 201520145609U CN 204442187 U CN204442187 U CN 204442187U
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Abstract
The utility model discloses a kind of safety low-pressure DC power supply, comprise power transformer, rectification circuit, circuit for electric leakage protector, filter regulator circuit and power indicating circuit; Wherein: the first alternating voltage step-down of power transformer to input obtains the second alternating voltage; The input of rectification circuit is connected with the output of power transformer, and circuit for electric leakage protector is connected between rectification circuit and power transformer; The input of filter regulator circuit is connected with the output of rectification circuit; The utility model carries out step-down by the alternating voltage of power transformer to input, rectification circuit carries out rectification to the alternating voltage after step-down, meeting continuous-current plant can simultaneously to the demand of multiple load supplying by the filter regulator circuit being provided with multiple output, so, the versatility of continuous-current plant is added; And when input voltage transfinites, the utility model can cut off in time and exchange input, reduces accidental loss.
Description
Technical field
The utility model relates to low-tension supply technical field, is specially a kind of safety low-pressure DC power supply.
Background technology
Along with the fast development of automated control technology, various Automated condtrol components and parts are as programmable logic controller (PLC) (Programmable Logic Controller, PLC), the device such as signals collecting transducer, intelligent display screen, optical-electrical converter, signal converter is widely used, these Automated condtrol components and parts are stable, convenient, safe and quick in order to use, and its power supply mostly adopts the continuous-current plant of low pressure.But traditional continuous-current plant generally can only give single load supplying, when needs are to multiple load supplying, just need to redesign continuous-current plant, so, make continuous-current plant versatility not strong; And traditional low-tension supply is when running into overvoltage phenomenon, weatherability and fail safe deficiency, urgently improve.
Utility model content
The purpose of this utility model is to provide a kind of safety low-pressure DC power supply, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of safety low-pressure DC power supply, comprises power transformer, rectification circuit, circuit for electric leakage protector, filter regulator circuit and power indicating circuit; Wherein: the first alternating voltage step-down of power transformer to input obtains the second alternating voltage; The input of rectification circuit is connected with the output of power transformer, and circuit for electric leakage protector is connected between rectification circuit and power transformer, and the second alternating voltage that power transformer exports by rectification circuit is converted to the first direct voltage; The input of filter regulator circuit is connected with the output of rectification circuit, and filter regulator circuit carries out filtering and voltage stabilizing to the first direct voltage that rectification circuit exports; Over-voltage detection circuit is parallel with at switch S 1 two ends of described circuit for electric leakage protector; Over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX and resistance R2, and resistance RX is positioned at cold end, and the component voltage on resistance RX exports the control pole of bidirectional triode thyristor Q1 to, and resistance RX is adjustable resistance, resistance RX two end node shunt capacitance C5; Overvoltage protection part is formed by bidirectional triode thyristor Q1, adjustable resistance RX, resistance R2, electric capacity C5; Described filter regulator circuit is provided with multiple output; The input Vin of the voltage stabilizing chip U1 in filter regulator circuit connects the common port of the positive pole of electrochemical capacitor C1 and one end of leaded multilayer ceramic capacitor C2, and the earth terminal GND of voltage stabilizing chip U1 connects earth terminal; The 3rd filter circuit in filter regulator circuit comprises electrochemical capacitor C3 and leaded multilayer ceramic capacitor C4, the positive pole of electrochemical capacitor C3 is connected the output end vo ut of voltage stabilizing chip U1 with the common port of one end of leaded multilayer ceramic capacitor C4, the negative pole of electrochemical capacitor C3 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C4.
As the utility model further technical scheme, the second filter circuit in filter regulator circuit comprises electrochemical capacitor C1 and leaded multilayer ceramic capacitor C2, the positive pole of electrochemical capacitor C1 is connected the output of rectification circuit with the common port of one end of leaded multilayer ceramic capacitor C2, and the negative pole of electrochemical capacitor C1 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C2.
As the utility model further technical scheme, the input of power indicating circuit connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, and the output of power indicating circuit connects earth terminal; Power indicating circuit comprises: resistance R1 and light-emitting diode L1, one end of resistance R1 connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, the anode of the other end connecting luminous diode L1 of resistance R1, the negative electrode of light-emitting diode L1 connects earth terminal.
As the utility model further technical scheme, each output of filter regulator circuit comprises two output ports, the direct current after the voltage stabilizing of an output port output filtering, and another output port connects earth terminal GND.
Compared with prior art, the utility model carries out step-down by the alternating voltage of power transformer to input, rectification circuit carries out rectification to the alternating voltage after step-down, meeting continuous-current plant can simultaneously to the demand of multiple load supplying by the filter regulator circuit being provided with multiple output, so, the versatility of continuous-current plant is added; And when input voltage transfinites, the utility model can cut off in time and exchange input, reduces accidental loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of safety low-pressure DC power supply of the utility model.
Embodiment
Be described in more detail below in conjunction with the technical scheme of embodiment to this patent.
Refer to Fig. 1, a kind of safety low-pressure DC power supply, comprises power transformer, rectification circuit, circuit for electric leakage protector and filter regulator circuit; Wherein: the first alternating voltage step-down of power transformer to input obtains the second alternating voltage; The input of rectification circuit is connected with the output of power transformer, and circuit for electric leakage protector is connected between rectification circuit and power transformer, and the second alternating voltage that power transformer exports by rectification circuit is converted to the first direct voltage; The input of filter regulator circuit is connected with the output of rectification circuit, and filter regulator circuit carries out filtering and voltage stabilizing to the first direct voltage that rectification circuit exports; Be parallel with over-voltage detection circuit at switch S 1 two ends of described circuit for electric leakage protector, when the input voltage of low-voltage leakage protector transfinites, over-voltage detection circuit exports the voltage control electronic switch conducting being greater than electronic switch threshold value; Over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX and resistance R2, and resistance RX is positioned at cold end, and the component voltage on resistance RX exports the control pole of bidirectional triode thyristor Q1 to, and resistance RX is adjustable resistance, resistance RX two end node shunt capacitance C5; Overvoltage protection part is formed by bidirectional triode thyristor Q1, adjustable resistance RX, resistance R2, electric capacity C5.Be connected in parallel on switch for leakage protector button S1 two ends (shift knob S1 two ends have the voltage equal with earth leakage protective device input before not pressing); when voltage is normal by the undertension fallen after adjustable resistance RX and resistance R2 dividing potential drop (this voltage can be adjusted by R1) on adjustable resistance RX to trigger Q1 conducting; thus produce loop to simulation leakage current not affect (being in off state), protector normally runs.When (such as: misphase, neutral line break and thunder and lightning etc.) causes the voltage fallen on adjustable resistance RX during line over-voltage to be greater than electronic switch threshold value for a certain reason, be enough to trigger bidirectional triode thyristor Q1 conducting, simulate leakage current generation loop after bidirectional triode thyristor Q1 conducting and be in channel status, be equivalent to press shift knob S1, then protector tripping operation is cut off the electricity supply, and serves overvoltage protection effect;
Described filter regulator circuit is provided with multiple output, and each described output is for connecting a load; The operation principle of continuous-current plant illustrates, when the first alternating voltage is AC220V, power transformer obtains AC17V AC220V step-down, and AC17V is delivered to rectification circuit, AC17V is converted to DC24V by rectification circuit, and DC24V is delivered to filter regulator circuit, DC24V outputs to load by the output of filter regulator circuit after filter regulator circuit filtering voltage regulation, thus is load supplying.
The ac input end AC of the output of power transformer T1 and rectifier bridge chip B1 the first filter circuit of not shown rectification circuit (in Fig. 1) is connected, first alternating voltage step-down is obtained the second alternating voltage by power transformer T1, and exporting the second alternating voltage to rectifier bridge chip B1, rectifier bridge chip B1 carries out rectification to the second alternating voltage and obtains the first direct voltage and export filter regulator circuit to.
The second filter circuit in filter regulator circuit comprises electrochemical capacitor C1 and leaded multilayer ceramic capacitor C2, the positive pole of electrochemical capacitor C1 is connected the output (the concrete output plus terminal V+ connecting rectifier bridge chip B1) of rectification circuit with the common port of one end of leaded multilayer ceramic capacitor C2, the negative pole of electrochemical capacitor C1 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C2, wherein, the output negative terminal V-of rectifier bridge chip B1 connects earth terminal.
The input Vin of the voltage stabilizing chip U1 in filter regulator circuit connects the common port of the positive pole of electrochemical capacitor C1 and one end of leaded multilayer ceramic capacitor C2, and the earth terminal GND of voltage stabilizing chip U1 connects earth terminal.
The 3rd filter circuit in filter regulator circuit comprises electrochemical capacitor C3 and leaded multilayer ceramic capacitor C4, the positive pole of electrochemical capacitor C3 is connected the output end vo ut of voltage stabilizing chip U1 with the common port of one end of leaded multilayer ceramic capacitor C4, the negative pole of electrochemical capacitor C3 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C4; Wherein, filter regulator circuit also comprises diode D1, and the anode of diode D1 connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, and negative electrode connects the common port of the positive pole of electrochemical capacitor C1 and described one end of leaded multilayer ceramic capacitor C2.
It should be noted is that, diode D1 is reverse diode, for the reverse voltage in filter regulator circuit, to protect voltage stabilizing chip U1.
For optimizing above-described embodiment further, can also comprise: power indicating circuit, the input of power indicating circuit connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, and the output of power indicating circuit connects earth terminal.Concrete, in the present embodiment, power indicating circuit comprises: resistance R1 and light-emitting diode L1, one end of resistance R1 connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, the anode of the other end connecting luminous diode L1 of resistance R1, the negative electrode of light-emitting diode L1 connects earth terminal.
It should be noted is that, power indicating circuit is for pointing out the operating state of continuous-current plant and for showing that whether continuous-current plant internal circuit is intact.When continuous-current plant is in running order, the light-emitting diode L1 in power indicating circuit is luminous, shows that continuous-current plant internal circuit is without damage simultaneously; When continuous-current plant is not in running order, light-emitting diode L1 is not luminous; Wherein, each output of filter regulator circuit comprises two output ports, and an output port is used for the direct current (such as+24V) after output filtering voltage stabilizing, and another output port is for connecting earth terminal GND.
Above the better embodiment of this patent is explained in detail, but this patent is not limited to above-mentioned execution mode, in the ken that one skilled in the relevant art possesses, various change can also be made under the prerequisite not departing from this patent aim.
Claims (4)
1. a safety low-pressure DC power supply, is characterized in that, comprises power transformer, rectification circuit, circuit for electric leakage protector, filter regulator circuit and power indicating circuit; Wherein: the first alternating voltage step-down of power transformer to input obtains the second alternating voltage; The input of rectification circuit is connected with the output of power transformer, and circuit for electric leakage protector is connected between rectification circuit and power transformer; The input of filter regulator circuit is connected with the output of rectification circuit; Over-voltage detection circuit is parallel with at switch S 1 two ends of described circuit for electric leakage protector; Over-voltage detection circuit is the resitstance voltage divider be composed in series by resistance RX and resistance R2, and resistance RX is positioned at cold end, and the component voltage on resistance RX exports the control pole of bidirectional triode thyristor Q1 to, and resistance RX is adjustable resistance, resistance RX two end node shunt capacitance C5; Overvoltage protection part is formed by bidirectional triode thyristor Q1, adjustable resistance RX, resistance R2, electric capacity C5; Described filter regulator circuit is provided with multiple output; The input Vin of the voltage stabilizing chip U1 in filter regulator circuit connects the common port of the positive pole of electrochemical capacitor C1 and one end of leaded multilayer ceramic capacitor C2, and the earth terminal GND of voltage stabilizing chip U1 connects earth terminal; The 3rd filter circuit in filter regulator circuit comprises electrochemical capacitor C3 and leaded multilayer ceramic capacitor C4, the positive pole of electrochemical capacitor C3 is connected the output end vo ut of voltage stabilizing chip U1 with the common port of one end of leaded multilayer ceramic capacitor C4, the negative pole of electrochemical capacitor C3 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C4.
2. a kind of safety low-pressure DC power supply according to claim 1, it is characterized in that, the second filter circuit in filter regulator circuit comprises electrochemical capacitor C1 and leaded multilayer ceramic capacitor C2, the positive pole of electrochemical capacitor C1 is connected the output of rectification circuit with the common port of one end of leaded multilayer ceramic capacitor C2, and the negative pole of electrochemical capacitor C1 is connected earth terminal with the common port of the other end of leaded multilayer ceramic capacitor C2.
3. a kind of safety low-pressure DC power supply according to claim 1, is characterized in that, the input of power indicating circuit connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, and the output of power indicating circuit connects earth terminal; Power indicating circuit comprises: resistance R1 and light-emitting diode L1, one end of resistance R1 connects the common port of the positive pole of electrochemical capacitor C3 and described one end of leaded multilayer ceramic capacitor C4, the anode of the other end connecting luminous diode L1 of resistance R1, the negative electrode of light-emitting diode L1 connects earth terminal.
4. a kind of safety low-pressure DC power supply according to claim 1, is characterized in that, each output of filter regulator circuit comprises two output ports, the direct current after the voltage stabilizing of an output port output filtering, and another output port connects earth terminal GND.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145609.8U CN204442187U (en) | 2015-03-14 | 2015-03-14 | A kind of safety low-pressure DC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520145609.8U CN204442187U (en) | 2015-03-14 | 2015-03-14 | A kind of safety low-pressure DC power supply |
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| CN204442187U true CN204442187U (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520145609.8U Expired - Fee Related CN204442187U (en) | 2015-03-14 | 2015-03-14 | A kind of safety low-pressure DC power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039826A (en) * | 2017-12-15 | 2018-05-15 | 广东云耕数字技术有限公司 | A kind of intelligent power supply power supply |
-
2015
- 2015-03-14 CN CN201520145609.8U patent/CN204442187U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108039826A (en) * | 2017-12-15 | 2018-05-15 | 广东云耕数字技术有限公司 | A kind of intelligent power supply power supply |
| CN108039826B (en) * | 2017-12-15 | 2019-08-27 | 广东云耕数字技术有限公司 | A kind of intelligent power supply power supply |
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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: 20150701 Termination date: 20170314 |