CN104167928A - Power supply circuit and power supply apparatus - Google Patents
Power supply circuit and power supply apparatus Download PDFInfo
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- CN104167928A CN104167928A CN201310180928.8A CN201310180928A CN104167928A CN 104167928 A CN104167928 A CN 104167928A CN 201310180928 A CN201310180928 A CN 201310180928A CN 104167928 A CN104167928 A CN 104167928A
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Abstract
The invention, which belong s to the power supply field, especially relates to a power supply circuit and a power supply apparatus. The power supply circuit including a rectifier filter module, an over-temperature protection module and a voltage conversion module is used; the over-temperature protection module compares an external temperature value with a preset temperature value and outputs a direct current or maintains a cut-off state according to the comparison result; and the voltage conversion module carries out voltage conversion when the over-temperature protection module outputs the direct current. According to the circuit, the over-temperature protection function of the power supply circuit is realized; and the advantage that the highest work temperature value can be set is realized.
Description
Technical field
The invention belongs to Power supply field, particularly a kind of power circuit and supply unit.
Background technology
When power circuit uprises while causing circuit elements device temperature to raise in abnormal working position or ambient temperature, too high temperature may be burnt circuit elements device, even initiation fire.Therefore, in existing power circuit, generally can increase overheat protector function.But existing power circuit is all generally to utilize the overheat protector system that analog chip inside carries to realize overheat protector function, cannot maximum operating temperature value be set according to concrete environment for use.
Therefore there is the problem that maximum operating temperature value cannot be set in existing power circuit.
Summary of the invention
The object of the present invention is to provide a kind of power circuit, be intended to solve existing power circuit and have the problem that maximum operating temperature value cannot be set.
The present invention is achieved in that a kind of power circuit, comprises that input is connected with electric main, and for electric main being converted to galvanic rectification filtering module, described power circuit also comprises:
Overheat protector module, input is connected with the output of described rectification filtering module, for ambient temperature value and preset temperature value are compared, and exports described direct current or remain off state according to comparative result;
Voltage transformation module, input is connected with the output of described overheat protector module, and output connects the power end of load, in the time that described overheat protector module is exported described direct current, described direct current is carried out to voltage transitions.
Another object of the present invention is also to provide a kind of supply unit that comprises above-mentioned power circuit.
The present invention comprises the described power circuit of described rectification filtering module, described overheat protector module and described voltage transformation module by employing; by described overheat protector module, ambient temperature value and preset temperature value are compared; and according to comparative result output direct current or remain off state; described voltage transformation module carries out voltage transitions to described direct current in the time that described overheat protector module is exported described direct current; whole circuit has been realized the function of power circuit overheat protector, has advantages of that maximum operating temperature value can arrange.
Brief description of the drawings
Fig. 1 is the modular structure figure of the power circuit that provides of the embodiment of the present invention;
Fig. 2 is the exemplary circuit structure chart of the power circuit that provides of the embodiment of the present invention
Fig. 3 is the exemplary circuit structure chart of the power circuit that provides of one embodiment of the invention
Fig. 4 is the exemplary circuit structure chart of the power circuit that provides of one embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The present invention comprises the power circuit of rectification filtering module, overheat protector module and voltage transformation module by employing, realized the function of power circuit overheat protector, has advantages of that maximum operating temperature value can arrange.
Fig. 1 shows the modular structure of the power circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
This power circuit comprises that input is connected with electric main, and for electric main being converted to galvanic rectification filtering module 100, this power circuit also comprises:
Overheat protector module 200, input is connected with the output of rectification filtering module 100, for ambient temperature value and preset temperature value are compared, and according to comparative result output direct current or remain off state.
Voltage transformation module 300, input is connected with the output of overheat protector module 200, and output connects the power end of load, for direct current being carried out to voltage transitions in the time that overheat protector module 200 is exported direct current.
In embodiments of the present invention, preset temperature value is the maximum operating temperature value that user allows power circuit work.
Fig. 2 shows the exemplary circuit structure of the power circuit that the embodiment of the present invention provides, and for convenience of explanation, only shows part related to the present invention, and details are as follows:
As one embodiment of the invention, overheat protector module 200 comprises:
Thermistor NTC, divider resistance R1 and switching tube 201;
The input of the first end of thermistor NTC and switching tube 201 connects the input that forms overheat protector module 200 altogether; the second end of thermistor NTC connects the first end of divider resistance R1; the second termination ground wire of divider resistance R1; the control end of switching tube 201 connects the first end of divider resistance R1, and the output of switching tube 201 is outputs of overheat protector module 200.Wherein, as shown in Figure 3, switching tube 201 can be positive-negative-positive triode Q1, and emitter, collector electrode and the base stage of positive-negative-positive triode Q1 are respectively input, output and the control end of switching tube 201.In addition, as shown in Figure 4, switching tube 201 can also be PMOS pipe Q4, and source electrode, the drain and gate of PMOS pipe Q4 are respectively input, output and the control end of switching tube 201.
It is worth mentioning that, in embodiments of the present invention, by changing the divider resistance R1 of different resistances, can facilitate, accurately arrange the maximum operating temperature value of power circuit.
As one embodiment of the invention, voltage transformation module 300 comprises:
Resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, capacitor C 2, capacitor C 3, diode D1, diode D2, diode D3, diode D4, NPN type triode Q2, NPN type triode Q3, transformer T1 and photoelectrical coupler U1;
The first end of the armature winding of the first end of resistance R 2 and transformer T1 connects the input that forms voltage transformation module 300 altogether, the first end of the second end contact resistance R3 of resistance R 2, the second end of resistance R 3, the collector electrode of the first end of capacitor C 1 and NPN type triode Q2 is connected to the base stage of NPN type triode Q3 altogether, the second end of the armature winding of the collector electrode connection transformer T1 of NPN type triode Q3, the first end of the second end contact resistance R4 of capacitor C 1, the second end of resistance R 4 and the negative electrode of diode D2 are connected to the first end of the auxiliary winding of transformer altogether, the second end of the auxiliary winding of transformer connects the positive pole of capacitor C 2, the base stage of NPN type triode Q2 and the first end of resistance R 5 are connected to the negative electrode of diode D1 altogether, the second end of resistance R 5, the first end of the anode of diode D1 and resistance R 6 is connected to the emitter of NPN type triode Q3 altogether, the negative pole of capacitor C 2, the anode of diode D2, the emitter of the second end of resistance R 6 and NPN type triode Q2 is connected to ground wire altogether, the positive pole of the first end of the secondary winding of transformer T1 and capacitor C 3 connects the output that forms voltage transformation module 300 altogether, the anode of the negative pole of capacitor C 3 and diode D3 is connected to ground altogether, the second end of the secondary winding of the negative electrode connection transformer T1 of diode D3, the first end of the first input end of photoelectrical coupler U1 and resistance R 7 is connected to the positive pole of capacitor C 3 altogether, the first output of photoelectrical coupler U1 and the second end of resistance R 7 are connected to the negative electrode of diode D4 altogether, the plus earth of diode D4, the second input of photoelectrical coupler U1 connects the positive pole of capacitor C 2, the second output of photoelectrical coupler U1 connects the negative electrode of diode D1.
Describe the operation principle of above-mentioned power circuit in detail below in conjunction with Fig. 2:
In the normothermic situation in the external world, thermistor NTC is in high-impedance state, divider resistance R1 first end is in low level state, open the light pipe 201 control end simultaneously in low level state, now switching tube 201 is in conducting state, and the base stage that the direct current of being exported by rectification filtering module 100 outputs to NPN type triode Q3 through switching tube 201 makes its conducting.After NPN type triode Q3 conducting, the increase of starting from scratch of the primary winding current of transformer T1, the secondary winding of transformer T1 produces induced voltage, but owing to there being diode D3 reversal connection, cannot produce induced current.Meanwhile, the auxiliary winding of transformer T1 produces induced current has enough electric currents to input and keeps conducting to maintain the base stage of NPN type triode Q3.Because NPN type triode Q3 collector current constantly increases, NPN type triode Q3 is by being operated in zone of saturation to unsaturated zone-transfer, now the voltage of the armature winding of transformer T1 reduces, the induced potential of its secondary winding is corresponding reducing also, and NPN type triode Q3 ends because base stage can not get enough electric current supplies.At NPN type triode, Q3 enters after cut-off state, and each winding of transformer T1 will produce inverse electromotive force, and secondary winding makes diode D3 conducting, the current direction load of generation.Until that transformer energy almost discharges is complete, on secondary winding, also have the residual energy of minute quantity, cannot maintain the conducting of diode D3.This part energy returns again and makes auxiliary winding produce induced potential, and NPN type triode Q3 conducting again, continues to repeat switch motion above.
If in the time of NPN type triode Q3 conducting, the induced potential of the secondary winding of transformer T1 increases excessive, the second input of photoelectrical coupler U1 and the second output be conducting, the electric current of the auxiliary winding of transformer T1 is transported in the base stage of NPN type triode Q2 and makes its conducting.Meanwhile, NPN type triode Q3 is because base earth line ends in low level state, each winding induced potential reached zero growth.
The in the situation that of extraneous excess Temperature; the resistance value of thermistor NTC reduces; the first end of divider resistance R1 is in high level state; the control end of switching tube 201 is simultaneously in high level state; now switching tube 201 is in cut-off state, and the direct current of being exported by rectification filtering module 100 cannot pass through switching tube 201, and voltage transformation module 300 quits work; avoid power circuit to burn because of excess Temperature, realized the protection to power circuit.
If the maximum operating temperature value of power circuit is set, the divider resistance R1 that only need to change suitable resistance can realize, easy and simple to handle, and sets accurately.
Another object of the embodiment of the present invention is also to provide a kind of supply unit that comprises above-mentioned power circuit.
The embodiment of the present invention comprises the power circuit of rectification filtering module 100, overheat protector module 200 and voltage transformation module 300 by employing; by overheat protector module 200, ambient temperature value and preset temperature value are compared; and according to comparative result output direct current or remain off state; voltage transformation module 300 carries out voltage transitions to direct current in the time of overheat protector module output direct current; whole circuit has been realized the function of power circuit overheat protector, has advantages of that maximum operating temperature value can arrange.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a power circuit, comprises that input is connected with electric main, and for electric main being converted to galvanic rectification filtering module, it is characterized in that, described power circuit also comprises:
Overheat protector module, input is connected with the output of described rectification filtering module, for ambient temperature value and preset temperature value are compared, and exports described direct current or remain off state according to comparative result;
Voltage transformation module, input is connected with the output of described overheat protector module, and output connects the power end of load, in the time that described overheat protector module is exported described direct current, described direct current is carried out to voltage transitions.
2. power circuit as claimed in claim 1, is characterized in that, described overheat protector module comprises:
Thermistor, divider resistance R1 and switching tube;
The first end of described thermistor and the input of described switching tube connect the input that forms described overheat protector module altogether; the second end of described thermistor connects the first end of described divider resistance R1; the second termination ground wire of described divider resistance R1; the control end of described switching tube connects the first end of described divider resistance R1, and the output of described switching tube is the output of described overheat protector module.
3. power circuit as claimed in claim 1, is characterized in that, described voltage transformation module comprises:
Resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, capacitor C 1, capacitor C 2, capacitor C 3, diode D1, diode D2, diode D3, diode D4, NPN type triode Q2, NPN type triode Q3, transformer and photoelectrical coupler;
The first end of the first end of described resistance R 2 and the armature winding of described transformer connects the input that forms described voltage transformation module altogether, the second end of described resistance R 2 connects the first end of described resistance R 3, the second end of described resistance R 3, the collector electrode of the first end of described capacitor C 1 and described NPN type triode Q2 is connected to the base stage of described NPN type triode Q3 altogether, the collector electrode of described NPN type triode Q3 connects the second end of the armature winding of described transformer, the second end of described capacitor C 1 connects the first end of described resistance R 4, the second end of described resistance R 4 and the negative electrode of diode D2 are connected to the first end of the auxiliary winding of described transformer altogether, the second end of the auxiliary winding of described transformer connects the positive pole of described capacitor C 2, the base stage of described NPN type triode Q2 and the first end of described resistance R 5 are connected to the negative electrode of described diode D1 altogether, the second end of described resistance R 5, the first end of the anode of described diode D1 and described resistance R 6 is connected to the emitter of described NPN type triode Q3 altogether, the negative pole of described capacitor C 2, the anode of described diode D2, the emitter of the second end of described resistance R 6 and described NPN type triode Q2 is connected to ground wire altogether, the positive pole of the first end of the secondary winding of described transformer and described capacitor C 3 connects the output that forms described voltage transformation module altogether, the anode of the negative pole of described capacitor C 3 and described diode D3 is connected to ground altogether, the negative electrode of described diode D3 connects the second end of the secondary winding of described transformer, the first end of the first input end of described photoelectrical coupler and described resistance R 7 is connected to the positive pole of described capacitor C 3 altogether, the first output of described photoelectrical coupler and the second end of described resistance R 7 are connected to the negative electrode of described diode D4 altogether, the plus earth of described diode D4, the second input of described photoelectrical coupler connects the positive pole of described capacitor C 2, the second output of described photoelectrical coupler connects the negative electrode of described diode D1.
4. power circuit as claimed in claim 2, is characterized in that, described switching tube is positive-negative-positive triode Q1, and emitter, collector electrode and the base stage of described positive-negative-positive triode Q1 are respectively input, output and the control end of described switching tube.
5. power circuit as claimed in claim 2, is characterized in that, described switching tube is PMOS pipe Q4, the source electrode of described PMOS pipe Q4, input, output and the control end that drain and gate is respectively described switching tube.
6. a supply unit, comprises shell, it is characterized in that, described power supply dress also comprises the power circuit as described in claim 1 to 5 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180928.8A CN104167928B (en) | 2013-05-15 | 2013-05-15 | Power supply circuit and power supply apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310180928.8A CN104167928B (en) | 2013-05-15 | 2013-05-15 | Power supply circuit and power supply apparatus |
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| Publication Number | Publication Date |
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| CN104167928A true CN104167928A (en) | 2014-11-26 |
| CN104167928B CN104167928B (en) | 2017-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310180928.8A Active CN104167928B (en) | 2013-05-15 | 2013-05-15 | Power supply circuit and power supply apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105759822A (en) * | 2016-04-26 | 2016-07-13 | 江苏省农业科学院 | Agricultural-vehicle autonomous navigation control circuit |
| CN105762908A (en) * | 2016-04-09 | 2016-07-13 | 安徽朗格暖通设备有限公司 | Charger charging circuit and charger |
| CN113098250A (en) * | 2021-06-09 | 2021-07-09 | 深圳市赛迈科技有限公司 | Power supply circuit and vehicle-mounted power supply |
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| JPH05272465A (en) * | 1991-12-12 | 1993-10-19 | Carrier Corp | Over temperature protection system of three phase compressor |
| CN2884639Y (en) * | 2005-11-25 | 2007-03-28 | 神讯电脑(昆山)有限公司 | Overheat protection circuit |
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| CN102299508A (en) * | 2011-08-26 | 2011-12-28 | 深圳茂硕电子科技有限公司 | Power supply with duplex over-temperature protection circuits |
| CN102324853A (en) * | 2011-09-23 | 2012-01-18 | 广州金升阳科技有限公司 | A kind of auxiliary power supply method and auxiliary power circuit of DC-DC supply convertor |
| CN102593790A (en) * | 2011-01-05 | 2012-07-18 | 海洋王照明科技股份有限公司 | Lighting fixture overheating protection circuit and lighting fixture thereof |
| CN103036454A (en) * | 2011-10-08 | 2013-04-10 | 通嘉科技股份有限公司 | Power supply, power management device and low-voltage and excess-temperature protective method |
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2013
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05272465A (en) * | 1991-12-12 | 1993-10-19 | Carrier Corp | Over temperature protection system of three phase compressor |
| CN2884639Y (en) * | 2005-11-25 | 2007-03-28 | 神讯电脑(昆山)有限公司 | Overheat protection circuit |
| CN201656433U (en) * | 2010-02-05 | 2010-11-24 | 国基电子（上海）有限公司 | Overheat protection circuit and electronic equipment using overheat protection circuit |
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| CN202048996U (en) * | 2011-04-28 | 2011-11-23 | 海洋王照明科技股份有限公司 | Temperature monitoring circuit and led lamp |
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| CN102324853A (en) * | 2011-09-23 | 2012-01-18 | 广州金升阳科技有限公司 | A kind of auxiliary power supply method and auxiliary power circuit of DC-DC supply convertor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105762908A (en) * | 2016-04-09 | 2016-07-13 | 安徽朗格暖通设备有限公司 | Charger charging circuit and charger |
| CN105759822A (en) * | 2016-04-26 | 2016-07-13 | 江苏省农业科学院 | Agricultural-vehicle autonomous navigation control circuit |
| CN113098250A (en) * | 2021-06-09 | 2021-07-09 | 深圳市赛迈科技有限公司 | Power supply circuit and vehicle-mounted power supply |
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| Publication number | Publication date |
|---|---|
| CN104167928B (en) | 2017-05-03 |
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