CN203574537U - Alternating-current switching power supply startup circuit - Google Patents
Alternating-current switching power supply startup circuit Download PDFInfo
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- CN203574537U CN203574537U CN201320699237.4U CN201320699237U CN203574537U CN 203574537 U CN203574537 U CN 203574537U CN 201320699237 U CN201320699237 U CN 201320699237U CN 203574537 U CN203574537 U CN 203574537U
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- 239000003990 capacitor Substances 0.000 claims abstract description 34
- 239000003381 stabilizer Substances 0.000 claims description 12
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000006837 decompression Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model provides an alternating-current switching power supply startup circuit. The alternating-current switching power supply startup circuit is arranged between the L line of the alternating-current switching power supply input and a PWM chip and provides startup power for the VCC pin of the PWM chip. The alternating-current switching power supply startup circuit comprises a capacitor C1, a capacitor C2, a diode D1, a zener diode ZD1 and a triode Q1; the capacitor C1, the diode D1 and the capacitor C2 are serially connected between the L line of the alternating-current switching current input and the ground; the anode of the diode D1 is connected with the capacitor C1; the zener diode ZD1 is in parallel connection with the capacitor C2; the anode of the zener diode ZD1 is connected with the cathode of the diode D1; and the base of the triode Q1 is connected between the diode D1 and the capacitor C2, and the emitter and the collector are respectively connected with the VCC pin and the VC pin of the PWM chip. The alternating-current switching power supply startup circuit is simple, practical, free of energy-consuming resistors, little in energy consumption, and is energy-saving.
Description
Technical field
The utility model relates to field of switch power, particularly a kind of alternating-current switch power starting circuit.
Background technology
Switching Power Supply is utilized electronic switching device (as transistor, field effect transistor, controllable silicon thyratron etc.) exactly, pass through control circuit, make ceaselessly " connection " and " shutoff " of electronic switching device, allow electronic switching device carry out pulse modulation to input voltage, thereby realize DC/AC, DC/DC voltage transformation, and output voltage can be in harmonious proportion automatic voltage regulation.Control circuit is mainly to provide suitable PWM(pulse width modulation for switching device) signal, the control circuit that completes at present the switching device to Switching Power Supply is commonly referred to as pwm chip, UC2842/2843/2844/2845 is the PWM chip that is widely used at present various AC/DC, DC/DC power supply, be widely used in Switching Power Supply, its Main Function is to provide the required switching signal of Switching Power Supply switching tube.These chips in use need to provide on the pin VCC to it starting resistor, the circuit that offers these pwm chip starting resistors is called the start-up circuit of Switching Power Supply, as alternating-current switch power supply, its input is AC power, in application in practice, be generally the civil power of 220VAC50Hz or 110VAC60Hz at present, its object is exactly the direct current that civil power is converted to setting amplitude.Therefore, in use, the start-up circuit of Switching Power Supply is all generally to adopt civil power itself as power supply, produces and meets the needed power supply of PWM chip, and PWM chip obtains power supply and just can work.Therefore, this each circuit is called again the start-up circuit of alternating-current switch power supply, at present, have a lot of such circuit, but these circuit is very complicated, and device is too much and loss is very large.
Utility model content
The purpose of this utility model is to provide a kind of start-up circuit of the alternating-current switch power supply for 2842 Series P WM chips, this circuit is when exchanging input 110V or 220V, can provide starting resistor to 2842 Series P WM chip power supplies, to overcome the excessive problem of the too much loss of conventional start-up circuit device of current use.
The utility model for the technical scheme that realizes its technical purpose and adopt is: a kind of alternating-current switch power starting circuit, is arranged between the L line and PWM chip of alternating-current switch power supply input, for the VCC pin of PWM chip provides startup power supply; Comprise capacitor C 1, capacitor C 2, diode D1, voltage-stabiliser tube ZD1 and triode Q1;
Described capacitor C 1, diode D1, capacitor C 2 is connected between the L line and ground of alternating-current switch electric current input, and the anode of diode D1 connects capacitor C 1;
Described voltage-stabiliser tube ZD1 is in parallel with capacitor C 2, and the anode of described voltage-stabiliser tube ZD1 connects the negative electrode of diode D1;
The base stage of described triode Q1 is connected between described diode D1 and capacitor C 2, and emitter and collector connects respectively VCC pin and the VC pin of described PWM chip.
Further, in above-mentioned alternating-current switch power starting circuit: also comprise diode D2, the negative electrode of described diode D2 is connected with the junction of diode D1 with described capacitor C 1, the plus earth of described diode D2.
Further, in above-mentioned alternating-current switch power starting circuit: described triode Q1 is NPN type triode.
Further, in above-mentioned alternating-current switch power starting circuit: the puncture voltage of described voltage-stabiliser tube ZD1 is 20V.
Alternating-current switch power starting circuit of the present invention is simple and practical, there is no dissipative cell resistance, and itself can not expend how many energy, is a kind of energy-saving start-up circuit.
Below with reference to drawings and Examples, the utility model is described in detail.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
Embodiment 1, as shown in Figure 1, the present embodiment be a kind of based on 2842 of Dezhou instrument, be the start-up circuit of the alternating-current switch power supply of PWM chip.This circuit does not have the dissipative cells such as resistance, be connected between the L phase line and PWM chip of civil power, for the VCC pin of PWM chip provides the power supply of applicable voltage, the capacitor C 1 that main devices is useful on and capacitor C 2, the diode D1 that prevents reverse-conducting and diode D2, voltage-stabiliser tube ZD1 and triode Q1.As shown in Figure 1: capacitor C 1, diode D1, capacitor C 2 are connected between the L line and ground of alternating-current switch electric current input, and the anode of diode D1 connects capacitor C 1.
Voltage-stabiliser tube ZD1 is in parallel with capacitor C 2, and the anode of voltage-stabiliser tube ZD1 connects the negative electrode of diode D1;
The base stage of triode Q1 is connected between diode D1 and capacitor C 2, and emitter and collector connects respectively VCC pin and the VC pin of PWM chip.
The negative electrode of diode D2 is connected with the junction of diode D1 with described capacitor C 1, the plus earth of described diode D2.
In the present embodiment, ZD1 voltage-stabiliser tube can adopt 18V-20V.Triode Q1 is NPN type triode or positive-negative-positive triode, fixed as required.
The alternating-current switch power starting circuit specific works process prescription of the present embodiment:
When the AL of the L of civil power phase line end has 110V or 220V to exchange input, by interchange being become to pulsating direct current by diode D1 rectification again after capacitor C 1 capacitance decompression, then level and smooth by capacitor C 2, by the namely base voltage clamper of triode Q1 of capacitor C 1 two ends; Then by the emitter junction of triode Q1, arrive the VCC end of PWM chip, namely use at present the power supply VCC end of 2842 Series P WM chip (comprising 2842/2843/2844/2845) the PWM chips of relatively feeling, while reaching the starting resistor of 2842 Series P WM chips, chip is sent switching signal, Switching Power Supply work, the VC end of the rear PWM chip of work has self feeding pressure to be continued to 2842 Series P WM chip power supplies by the collector junction of triode Q1.Can normally work.
C1 described in Fig. 1 is connected on the L line that exchanges input, and one end is connected in D1 in addition; D1 is connected with triode Q1 base stage.Triode Q1 is NPN type triode; The emitter of triode Q1 is connected with the power supply VCC pin of alternating-current switch power supply 2842 Series P WM chips, and the base stage of triode Q1 connects the positive pole of C1 and ZD1; Self feeding after the collector electrode connecting valve power initiation of triode Q1 is pressed.
In the utility model 2842 Series P WM chip (comprising 2842/2843/2844/2845) alternating-current switch power starting circuits, by voltage stabilizing after capacitance decompression, when interchange input is normal, start-up circuit provides energy to alternating-current switch power supply 2842 Series P WM chip power supplies, and Switching Power Supply is carried out self-starting.
Claims (4)
1. an alternating-current switch power starting circuit, is arranged between the L line and PWM chip of alternating-current switch power supply input, for the VCC pin of PWM chip provides startup power supply; It is characterized in that: comprise capacitor C 1, capacitor C 2, diode D1, voltage-stabiliser tube ZD1 and triode Q1;
Described capacitor C 1, diode D1, capacitor C 2 is connected between the L line and ground of alternating-current switch electric current input, and the anode of diode D1 connects capacitor C 1;
Described voltage-stabiliser tube ZD1 is in parallel with capacitor C 2, and the anode of described voltage-stabiliser tube ZD1 connects the negative electrode of diode D1;
The base stage of described triode Q1 is connected between described diode D1 and capacitor C 2, and emitter and collector connects respectively VCC pin and the VC pin of described PWM chip.
2. alternating-current switch power starting circuit according to claim 1, is characterized in that: also comprise diode D2, the negative electrode of described diode D2 is connected with the junction of diode D1 with described capacitor C 1, the plus earth of described diode D2.
3. alternating-current switch power starting circuit according to claim 1 and 2, is characterized in that: described triode Q1 is NPN type triode.
4. alternating-current switch power starting circuit according to claim 1 and 2, is characterized in that: the puncture voltage of described voltage-stabiliser tube ZD1 is 20V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699237.4U CN203574537U (en) | 2013-11-06 | 2013-11-06 | Alternating-current switching power supply startup circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320699237.4U CN203574537U (en) | 2013-11-06 | 2013-11-06 | Alternating-current switching power supply startup circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203574537U true CN203574537U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320699237.4U Expired - Lifetime CN203574537U (en) | 2013-11-06 | 2013-11-06 | Alternating-current switching power supply startup circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203574537U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205350A (en) * | 2016-12-16 | 2018-06-26 | 航天科工惯性技术有限公司 | A kind of high temperature resistant servo circuit voltage regulator and accelerometer |
-
2013
- 2013-11-06 CN CN201320699237.4U patent/CN203574537U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205350A (en) * | 2016-12-16 | 2018-06-26 | 航天科工惯性技术有限公司 | A kind of high temperature resistant servo circuit voltage regulator and accelerometer |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |