CN213305810U - Low-temperature starting circuit and LED driving power supply - Google Patents
Low-temperature starting circuit and LED driving power supply Download PDFInfo
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- CN213305810U CN213305810U CN202022182691.5U CN202022182691U CN213305810U CN 213305810 U CN213305810 U CN 213305810U CN 202022182691 U CN202022182691 U CN 202022182691U CN 213305810 U CN213305810 U CN 213305810U
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Abstract
The utility model relates to a low temperature starting circuit and LED drive power supply, include: the power supply circuit comprises a first controller, a second controller, a first power supply circuit, a driving transformer and a second power supply circuit; the first end of the primary winding of the driving transformer is connected with a starting input signal, the third end of the driving transformer is connected with the second controller, the positive output end of the auxiliary winding of the driving transformer is connected with the first end of the first power supply circuit, the second end of the first power supply circuit is connected with the second power supply circuit, and the second power supply circuit is connected with the power supply end of the second controller; the third end of the first power supply circuit is connected with the power supply end of the first controller. The utility model discloses can avoid the supply voltage of controller to reach the not impaired risk of extreme value, still can guarantee long-term low temperature freezing back, LED drive power supply still can normally start smoothly.
Description
Technical Field
The utility model relates to a LED drive power supply's technical field, more specifically say, relate to a low temperature starting circuit and LED drive power supply.
Background
The outdoor LED driving power supply has the phenomenon that the working environment is severe, and the outdoor LED driving power supply can not be started due to freezing time in severe cold winter.
In order to solve the problem that the outdoor LED driving power supply cannot be normally started due to the fact that the outdoor LED driving power supply is in a frozen state for a long time in severe cold weather, the conventional method is to increase a winding of a driving transformer so as to improve the power supply voltage of a driving controller, and therefore the voltage which meets the normal starting requirement of the driving controller can be increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a low temperature starting circuit and LED drive power supply.
The utility model provides a technical scheme that its technical problem adopted is: a cold start circuit is constructed comprising: the power supply circuit comprises a first controller, a second controller, a first power supply circuit, a driving transformer and a second power supply circuit;
a first end of a primary winding of the driving transformer is connected with a starting input signal, a third end of the driving transformer is connected with the second controller, a positive output end of an auxiliary winding of the driving transformer is connected with a first end of the first power supply circuit, a second end of the first power supply circuit is connected with the second power supply circuit, and the second power supply circuit is connected with a power supply end of the second controller; and the third end of the first power supply circuit is connected with the power supply end of the first controller.
Preferably, the first power supply circuit includes: the rectifier circuit, the switch tube and the second voltage-stabilizing tube;
the second end of the rectifying circuit is connected with the positive output end of the auxiliary winding of the driving transformer, the first end of the rectifying circuit is connected with the second end of the switching tube, and the connecting end of the first end of the rectifying circuit and the second end of the switching tube is also connected to the second power supply circuit;
the positive electrode of the second voltage-stabilizing tube is grounded with the negative output end of the auxiliary winding of the driving transformer, the negative electrode of the second voltage-stabilizing tube is connected with the third end of the switch tube, and the first end of the switch tube is connected with the power supply end of the first controller;
the first end of the switch tube is the third end of the first power supply circuit, the connecting end of the first end of the rectifying circuit and the second end of the switch tube is the second end of the first power supply circuit, and the second end of the rectifying circuit is the first end of the first power supply circuit.
Preferably, the rectifier circuit includes: a rectifier diode; the switch tube is a triode;
the anode of the rectifier diode is the second end of the rectifier circuit, and the cathode of the rectifier diode is the first end of the rectifier circuit;
the first end of the switch tube is an emitting electrode of the triode, the second end of the switch tube is a collector electrode of the triode, and the third end of the switch tube is a base electrode of the triode.
Preferably, the second power supply circuit includes: the first diode, the first voltage regulator tube and the first capacitor;
the anode of the first diode is connected with the second end of the first power supply circuit, the cathode of the first diode is connected with the cathode of the first voltage-stabilizing tube, and the anode of the first voltage-stabilizing tube is connected with the power supply end of the second controller;
the first end of the first capacitor is connected with the power supply end of the second controller, and the second end of the first capacitor is grounded.
Preferably, the breakdown voltage of the first regulator tube satisfies: the difference value between the endpoint voltage of the second end of the first power supply circuit and the breakdown voltage of the first voltage regulator tube is larger than the power supply voltage of the second controller.
Preferably, the method further comprises the following steps: and the output circuit is connected with the secondary winding of the driving transformer and is used for processing and outputting an output signal of the secondary winding of the driving transformer.
Preferably, the output circuit includes: a first output circuit and a second output circuit;
the input end of the first output circuit is connected with the output end of the first secondary winding of the driving transformer, and the output end of the first output circuit outputs a first driving voltage;
the input end of the second output circuit is connected with the output end of the second secondary winding of the driving transformer, and the output end of the second output circuit outputs a second driving voltage.
Preferably, the first output circuit includes: the circuit comprises a first output diode, a first output capacitor, a first output resistor and a first energy storage capacitor;
the anode of the first output diode is connected with the positive output end of the first secondary winding of the driving transformer, the cathode of the first output diode is connected with the first end of the first energy storage capacitor, and the connecting end of the cathode of the first output diode and the first end of the first energy storage capacitor outputs the first driving voltage;
the first output capacitor is connected in series with the first output resistor and then connected in parallel between the anode and the cathode of the first output diode; and the negative output end of the first secondary winding of the driving transformer and the second end of the first energy storage capacitor are grounded.
Preferably, the second output circuit includes: the second output diode, the second output capacitor, the first output resistor and the second energy storage capacitor;
the anode of the second output diode is connected with the positive output end of the second secondary winding of the driving transformer, the cathode of the second output diode is connected with the first end of the second energy storage capacitor, and the connecting end of the cathode of the second output diode and the first end of the second energy storage capacitor outputs the second driving voltage;
the second output capacitor is connected in series with the second output resistor and then connected in parallel between the anode and the cathode of the second output diode; and the negative output end of the second secondary winding of the driving transformer and the second end of the second energy storage capacitor are grounded.
The utility model also provides a LED drive power supply, including above the low temperature starting circuit.
Implement the utility model discloses a low temperature starting circuit and LED drive power supply have following beneficial effect: the method comprises the following steps: the power supply circuit comprises a first controller, a second controller, a first power supply circuit, a driving transformer and a second power supply circuit; the first end of the primary winding of the driving transformer is connected with a starting input signal, the third end of the driving transformer is connected with the second controller, the positive output end of the auxiliary winding of the driving transformer is connected with the first end of the first power supply circuit, the second end of the first power supply circuit is connected with the second power supply circuit, and the second power supply circuit is connected with the power supply end of the second controller; the third end of the first power supply circuit is connected with the power supply end of the first controller. The utility model discloses can avoid the supply voltage of controller to reach the not impaired risk of extreme value, still can guarantee long-term low temperature freezing back, LED drive power supply still can normally start smoothly.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic block diagram of a low-temperature start circuit provided by an embodiment of the present invention;
fig. 2 is a circuit diagram of a low-temperature start circuit according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic block diagram of an alternative embodiment of the embodiments of the present invention. The low-temperature starting circuit can be applied to a power supply device, and the power supply device comprises but is not limited to an LED driving power supply and the like.
As shown in fig. 1, the low temperature start circuit may include: a first controller 101, a second controller 102, a first power supply circuit 103, a driving transformer 105, and a second power supply circuit 104.
A first end of a primary winding of the driving transformer 105 is connected with a starting input signal, a third end of the driving transformer 105 is connected with the second controller 102, a positive output end of an auxiliary winding of the driving transformer 105 is connected with a first end of the first power supply circuit 103, a second end of the first power supply circuit 103 is connected with the second power supply circuit 104, and the second power supply circuit 104 is connected with a power supply end of the second controller 102; the third terminal of the first power supply circuit 103 is connected to the power supply terminal of the first controller 101.
After being powered on, the second power supply circuit 104 provides a start voltage to the second controller 102, so that the second controller 102 starts to operate. After being powered on, the first power supply circuit 103 respectively outputs two paths of power supply signals according to the voltage signal output by the auxiliary winding of the driving transformer 105, wherein one path of power supply signals is sent to the second power supply circuit 104, the second power supply circuit 104 provides power supply signals to the second controller 102, the other path of power supply signals is directly sent to the first controller 101, and the first power supply circuit 103 provides power supply signals to the first controller 101, so that the first controller 101 and the second controller 102 work normally.
Specifically, after power-on, the start input signal is input to the second controller 102 through the primary winding of the driving transformer 105, and is output to the second power supply circuit 104 after being converted inside the second controller 102, for the second power supply circuit 104, when the charging voltage of the second power supply circuit 104 reaches the start voltage of the second controller 102, the second controller 102 operates, and at this time, the voltage signal of the auxiliary winding of the driving transformer 105 is output to the first power supply circuit 103, and is output in two paths by the first power supply circuit 103, one path supplies power to the second controller 102 through the second power supply circuit 104, and the other path directly transmits power to the first controller 101 through the first power supply circuit 103, so that the first controller 101 and the second controller 102 operate normally.
The embodiment of the utility model provides an in, through setting up second supply circuit 104, can effectively avoid second controller 102's supply voltage to reach the risk of extreme value, still can improve operating voltage simultaneously, guarantee under the low temperature condition, when the power inner part device descends to some extent because of low temperature, still can guarantee that first controller 101's operating voltage can satisfy its requirement of normal work for the low temperature environment is opened down the function smoothly, guarantees the normal work of power, avoids the problem of low temperature start failure to take place.
Further, in some embodiments, the first power supply circuit 103 includes: rectifier circuit, switch tube and second stabilivolt.
The second end of the rectifying circuit is connected with the positive output end of the auxiliary winding of the driving transformer 105, the first end of the rectifying circuit is connected with the second end of the switching tube, and the connecting end of the first end of the rectifying circuit and the second end of the switching tube is also connected to the second power supply circuit 104; the positive electrode of the second voltage-stabilizing tube is grounded with the negative output end of the auxiliary winding of the driving transformer 105, the negative electrode of the second voltage-stabilizing tube is connected with the third end of the switch tube, and the first end of the switch tube is connected with the power supply end of the first controller 101.
The first end of the switch tube is the third end of the first power supply circuit 103, the connection end of the first end of the rectifying circuit and the second end of the switch tube is the second end of the first power supply circuit 103, and the second end of the rectifying circuit is the first end of the first power supply circuit 103.
Optionally, the rectifier circuit includes: a rectifier diode; the switch tube is a triode. The anode of the rectifier diode is the second end of the rectifier circuit, and the cathode of the rectifier diode is the first end of the rectifier circuit. The first end of the switch tube is an emitting electrode of the triode, the second end of the switch tube is a collector electrode of the triode, and the third end of the switch tube is a base electrode of the triode.
Further, in some embodiments, the second power supply circuit 104 may be implemented by a capacitor, a diode, and a voltage regulator. The capacitor is used for inputting a start input to the second controller 102 through the primary winding of the driving transformer 105, and charging after internal conversion of the second controller 102, so as to provide a start voltage to the second controller 102. The diode is used for preventing reverse connection, namely preventing reverse current flowing of current signals or voltage signals. The voltage regulator tube is used to ensure that the operating voltage of the second controller 102 does not reach the limit value, thereby preventing the second controller 102 from being damaged due to reaching the limit value.
Further, in some embodiments, the method may further include: and an output circuit 106 connected to the secondary winding of the driving transformer 105, and processing and outputting an output signal of the secondary winding of the driving transformer 105.
Optionally, the output circuit 106 includes: a first output circuit 1061 and a second output circuit 1062. The input end of the first output circuit 1061 is connected to the output end of the first secondary winding of the driving transformer 105, and the output end of the first output circuit 1061 outputs a first driving voltage; an input terminal of the second output circuit 1062 is connected to an output terminal of the second secondary winding of the driving transformer 105, and an output terminal of the second output circuit 1062 outputs a second driving voltage.
The first output circuit 1061 is configured to process an output voltage of the first secondary winding of the driving transformer 105 and output a first driving voltage to a subsequent circuit connected thereto; the second output circuit 1062 is configured to process the output voltage of the second secondary winding of the driving transformer 105 and output a second driving voltage to a subsequent circuit connected thereto, so as to supply power to the main chip and the dimming circuit of the entire driving power supply, thereby ensuring that the entire driving power supply operates normally.
Specifically, as shown in fig. 2, fig. 2 is a schematic circuit diagram of an optional embodiment of the present invention.
As shown in fig. 2, in this embodiment, the first power supply circuit 103 includes: a rectifier diode D702, a triode 701; the first power supply circuit 103 may further include: a resistor R707, a resistor R708, a resistor R706, a capacitor C709, a capacitor C706, a capacitor C707, a capacitor CE701, and a second voltage regulator ZD 2.
In this embodiment, the second power supply circuit 104 includes: the method comprises the following steps: a first diode D1, a first zener ZD1 and a first capacitor C1.
In this embodiment, the first output circuit 1061 includes: a first output diode D703, a first output capacitor C710, a first output resistor R709, and a first energy storage capacitor CE 702. The second output circuit 1062 includes: a second output diode D704, a second output capacitor C711, a first output resistor R709, and a second energy-storage capacitor CE 703.
As shown in fig. 2, the anode of the first diode D1 is connected to the second terminal of the first power supply circuit 103 (i.e., the connection end (point a) between the cathode of the rectifier diode D702 and the collector of the transistor Q701), the cathode of the first diode D1 is connected to the cathode of the first voltage regulator ZD1, and the anode of the first voltage regulator ZD1 is connected to the power supply terminal of the second controller 102 (i.e., the fifth pin of U2); the first end of the first capacitor C1 is connected to the power supply end of the second controller 102, and the second end of the first capacitor C1 is grounded.
The breakdown voltage of the first voltage regulator tube ZD1 meets the following requirements: the difference between the voltage at the terminal of the second terminal of the first power supply circuit 103 and the breakdown voltage of the first zener ZD1 is greater than the power supply voltage of the second controller 102.
Further, as shown in fig. 2, the positive output terminal of the auxiliary winding T701B of the driving transformer 105 is connected to the anode of a rectifying diode D702, and the cathode of the rectifying diode D702 is connected to the collector of the transistor Q701 and to the anode of the first diode D1. The second end of the capacitor C709 is connected with the anode of the rectifier diode D702, the first end of the capacitor C709 is connected with the base electrode of the triode Q701 sequentially through the resistor R708 and the resistor R707, the first end of the capacitor C709 is further connected with the first end of the capacitor CE701, the first end of the capacitor CE701 is further connected with the cathode of the rectifier diode D702, the second end of the capacitor CE701, the negative output end of the auxiliary winding T701B of the driving transformer 105 and the anode of the second voltage regulator tube ZD2 are grounded; the cathode of the second voltage regulator ZD2 is connected to the base of the transistor Q701. The capacitor C707 and the resistor R706 are connected in parallel with the second voltage regulator ZD2 in turn. A first terminal of the capacitor C706 is connected to the power supply terminal of the first controller 101 (i.e., the twelfth pin of the U1), an emitter of the transistor Q701 is connected to the power supply terminal of the first controller 101, and a second terminal of the capacitor C706 is grounded.
As shown in fig. 2, the anode of the first output diode D703 is connected to the positive output terminal of the first secondary winding T701E of the driving transformer 105, the cathode of the first output diode D703 is connected to the first terminal of the first energy storage capacitor CE702, and the connection terminal of the cathode of the first output diode D703 and the first terminal of the first energy storage capacitor CE702 outputs the first driving voltage (Vo-2). The first output capacitor C710 is connected in series with the first output resistor R709 and then connected in parallel between the anode and the cathode of the first output diode D703; the negative output terminal of the first secondary winding T701E of the driving transformer 105 and the second terminal of the first energy storage capacitor CE702 are grounded.
In this embodiment, the anode of the second output diode D704 is connected to the positive output terminal of the second secondary winding T701D of the driving transformer 105, the cathode of the second output diode D704 is connected to the first terminal of the second energy-storage capacitor CE703, and the connection terminal of the cathode of the second output diode D704 and the first terminal of the second energy-storage capacitor CE703 outputs the second driving voltage (Vo-1).
The second output capacitor C711 is connected in series with the second output resistor R710 and then connected in parallel between the anode and the cathode of the second output diode D704; the negative output terminal of the second secondary winding T701D of the driving transformer 105 and the second terminal of the second energy-storage capacitor CE703 are grounded.
As shown in fig. 2, after power-on, the start input signal (HV +) passes through the primary winding T701A of the driving transformer 105 to the second controller 102, and is internally converted by the second controller 102 to charge the first capacitor C1, and when the charging voltage of the first capacitor C1 reaches the start voltage of the second controller 102, the second controller 102 operates. An auxiliary winding T701B of the driving transformer 105 is rectified to a point A through a rectifying diode D702, and is divided into two paths to provide electric energy, one path supplies power to the second controller 102 through a first diode D1 and a first voltage regulator ZD1, the other path outputs VCC through an emitter of a triode Q701 and supplies working voltage to the first controller 101, so that the first controller 101 and the second controller 102 work normally, and after the first controller 101 and the second controller 102 work normally, Vo-1 and Vo-2 output normally to supply power to the whole driving power main chip and the dimming circuit, and the whole driving circuit works normally.
As shown in fig. 2, due to the action of the first voltage regulator ZD1, when the voltage at the point a is increased, the VDD of the second controller 102 can be prevented from reaching the limit value, so that the second controller 102 is prevented from being damaged, and the voltage at the point a is increased, so that under the low-temperature condition, when the voltage-stabilizing value of the second voltage regulator ZD2 is reduced to some extent, the VCC voltage can be ensured to meet the requirement of the first controller 101, and the start-up can be smoothly performed in the low-temperature environment.
The utility model also provides a LED drive power supply, wherein, this LED drive power supply can include the embodiment of the utility model discloses the low temperature starting circuit. By arranging the low-temperature starting circuit, the LED driving power supply can still be started smoothly after being frozen at low temperature for a long time.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
Claims (10)
1. A cold start circuit, comprising: the power supply circuit comprises a first controller, a second controller, a first power supply circuit, a driving transformer and a second power supply circuit;
a first end of a primary winding of the driving transformer is connected with a starting input signal, a third end of the driving transformer is connected with the second controller, a positive output end of an auxiliary winding of the driving transformer is connected with a first end of the first power supply circuit, a second end of the first power supply circuit is connected with the second power supply circuit, and the second power supply circuit is connected with a power supply end of the second controller; and the third end of the first power supply circuit is connected with the power supply end of the first controller.
2. The cold start circuit of claim 1, wherein the first power supply circuit comprises: the rectifier circuit, the switch tube and the second voltage-stabilizing tube;
the second end of the rectifying circuit is connected with the positive output end of the auxiliary winding of the driving transformer, the first end of the rectifying circuit is connected with the second end of the switching tube, and the connecting end of the first end of the rectifying circuit and the second end of the switching tube is also connected to the second power supply circuit;
the positive electrode of the second voltage-stabilizing tube is grounded with the negative output end of the auxiliary winding of the driving transformer, the negative electrode of the second voltage-stabilizing tube is connected with the third end of the switch tube, and the first end of the switch tube is connected with the power supply end of the first controller;
the first end of the switch tube is the third end of the first power supply circuit, the connecting end of the first end of the rectifying circuit and the second end of the switch tube is the second end of the first power supply circuit, and the second end of the rectifying circuit is the first end of the first power supply circuit.
3. The cold start circuit of claim 2, wherein the rectifier circuit comprises: a rectifier diode; the switch tube is a triode;
the anode of the rectifier diode is the second end of the rectifier circuit, and the cathode of the rectifier diode is the first end of the rectifier circuit;
the first end of the switch tube is an emitting electrode of the triode, the second end of the switch tube is a collector electrode of the triode, and the third end of the switch tube is a base electrode of the triode.
4. The cold start circuit of claim 1, wherein the second power supply circuit comprises: the first diode, the first voltage regulator tube and the first capacitor;
the anode of the first diode is connected with the second end of the first power supply circuit, the cathode of the first diode is connected with the cathode of the first voltage-stabilizing tube, and the anode of the first voltage-stabilizing tube is connected with the power supply end of the second controller;
the first end of the first capacitor is connected with the power supply end of the second controller, and the second end of the first capacitor is grounded.
5. The cryogenic start-up circuit of claim 4, wherein the breakdown voltage of the first regulator tube satisfies: the difference value between the endpoint voltage of the second end of the first power supply circuit and the breakdown voltage of the first voltage regulator tube is larger than the power supply voltage of the second controller.
6. The cold start circuit of claim 1, further comprising: and the output circuit is connected with the secondary winding of the driving transformer and is used for processing and outputting an output signal of the secondary winding of the driving transformer.
7. The cold start circuit of claim 6, wherein the output circuit comprises: a first output circuit and a second output circuit;
the input end of the first output circuit is connected with the output end of the first secondary winding of the driving transformer, and the output end of the first output circuit outputs a first driving voltage;
the input end of the second output circuit is connected with the output end of the second secondary winding of the driving transformer, and the output end of the second output circuit outputs a second driving voltage.
8. The cold start circuit of claim 7, wherein the first output circuit comprises: the circuit comprises a first output diode, a first output capacitor, a first output resistor and a first energy storage capacitor;
the anode of the first output diode is connected with the positive output end of the first secondary winding of the driving transformer, the cathode of the first output diode is connected with the first end of the first energy storage capacitor, and the connecting end of the cathode of the first output diode and the first end of the first energy storage capacitor outputs the first driving voltage;
the first output capacitor is connected in series with the first output resistor and then connected in parallel between the anode and the cathode of the first output diode; and the negative output end of the first secondary winding of the driving transformer and the second end of the first energy storage capacitor are grounded.
9. The cold start circuit of claim 7, wherein the second output circuit comprises: the second output diode, the second output capacitor, the second output resistor and the second energy storage capacitor;
the anode of the second output diode is connected with the positive output end of the second secondary winding of the driving transformer, the cathode of the second output diode is connected with the first end of the second energy storage capacitor, and the connecting end of the cathode of the second output diode and the first end of the second energy storage capacitor outputs the second driving voltage;
the second output capacitor is connected in series with the second output resistor and then connected in parallel between the anode and the cathode of the second output diode; and the negative output end of the second secondary winding of the driving transformer and the second end of the second energy storage capacitor are grounded.
10. An LED driving power supply comprising the low-temperature starting circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022182691.5U CN213305810U (en) | 2020-09-29 | 2020-09-29 | Low-temperature starting circuit and LED driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022182691.5U CN213305810U (en) | 2020-09-29 | 2020-09-29 | Low-temperature starting circuit and LED driving power supply |
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| CN213305810U true CN213305810U (en) | 2021-05-28 |
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| CN202022182691.5U Active CN213305810U (en) | 2020-09-29 | 2020-09-29 | Low-temperature starting circuit and LED driving power supply |
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