CN211928131U - Switching circuit of switch power supply indicator lamp - Google Patents
Switching circuit of switch power supply indicator lamp Download PDFInfo
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- CN211928131U CN211928131U CN201922322050.2U CN201922322050U CN211928131U CN 211928131 U CN211928131 U CN 211928131U CN 201922322050 U CN201922322050 U CN 201922322050U CN 211928131 U CN211928131 U CN 211928131U
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Abstract
The utility model discloses a switching circuit of a switch power supply indicator lamp, which comprises a constant current and constant voltage module, a bias module and a double indicator lamp module, wherein the input end of the constant current and constant voltage module is connected with the input end of the double indicator lamp module through the bias module; the constant current and constant voltage module comprises a constant current module and a constant voltage module; according to the switching circuit of the switch power supply indicator lamp, through the matched arrangement of the constant-current constant-voltage module, the bias module and the double indicator lamp module, when the sampling voltage of the double indicator lamp module is greater than the forward reference voltage, the voltage or the current of the switch power supply is in a safe state, and at the moment, the green lamp of the double indicator lamp module is turned on; when the sampling voltage of the double-indicator lamp module is smaller than the forward reference voltage, the voltage or the current of the switching power supply is in an overload state, and the red lamp of the double-indicator lamp module is turned on; the voltage or current of the switching power supply is too high at the moment, so that a user can quickly respond and timely process the voltage or current, the damage to a switching power supply circuit or a load is avoided, and the cost is saved.
Description
Technical Field
The utility model relates to an electronic circuit technical field specifically is a switching power supply pilot lamp switching circuit.
Background
The switching power supply has the advantages of small volume, high efficiency and the like, and is widely applied to the fields of computers, industrial control, communication and consumer electronics. In the prior art, the switch power supply is not provided with an indicator lamp in the using process, so that the working state of the switch power supply is difficult to judge in the using process of the switch power supply, the switch power supply is usually damaged when the current or the voltage is overlarge, even the load is burnt out, and the resource waste is caused.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a switching power supply pilot lamp switching circuit.
A switching circuit of a switch power supply indicator lamp comprises a constant-current constant-voltage module, a bias module and a double-indicator lamp module, wherein the input end of the constant-current constant-voltage module is connected with the input end of the double-indicator lamp module through the bias module; the constant current and constant voltage module comprises a constant current module and a constant voltage module.
One embodiment of the dual-indicator light module is that the dual-indicator light module comprises an operational amplifier U700-a, a resistor R8A, a resistor R709, a resistor R710, a resistor R711, a resistor R712, a resistor R713, a resistor R714, a triode Q702, a first light emitting diode, a second light emitting diode, and a capacitor C703, one end of the resistor R709 is connected with a same-direction input end of the operational amplifier U700-a, one end of the resistor R710 is connected with a reverse input end of the operational amplifier U700-a, an output end of the operational amplifier U700-a is connected with a common connection point between the first light emitting diode and the resistor R714, one end of the resistor R714 is connected with the resistor R713, a base of the triode Q702 is connected with the common connection point between the resistor R713 and the resistor R714, a collector is connected with a negative electrode of the second light emitting diode, the resistor R711 is connected in series with the capacitor C703 and is respectively connected with the reverse input end and the output, The anode of the second light emitting diode is connected.
One embodiment is that the constant voltage module comprises a voltage regulator tube SHR80, a voltage regulator tube ZD80, a photoelectric coupler U1-A, a resistor R80, a resistor R80A, a resistor R80B, a resistor R81, a resistor R83, an adjustable resistor VR and a capacitor C81, wherein the resistor R80A, the adjustable resistor VR and the resistor R80B are sequentially connected in series, a cathode of the voltage regulator tube SHR80 is connected with one end of the resistor R81, an R pole is connected with a common connection point between the adjustable resistor VR and the resistor R80B, the other end of the resistor R81 is connected with one end of the resistor R80, the other end of the resistor R80 is connected with an anode of the voltage regulator tube ZD80, the photoelectric coupler U1-A is connected with the resistor R81 in parallel, one end of the resistor R6 is connected with the cathode of the voltage regulator tube SHR80, and the other end of the resistor R46.
One embodiment is that the constant current module includes an operational amplifier U700-B, a diode D1, a resistor R7A, a resistor R700, a resistor R704, a resistor R707, and a capacitor C700, wherein a same-direction input end of the operational amplifier U700-B is connected to one end of the resistor R707, an opposite-direction input end is connected to one end of the resistor R700, an output end is connected to a negative electrode of the diode D1, one end of the resistor R7A is connected to the resistor R707, and the resistor R704 and the capacitor C700 are connected in series and are respectively connected to an opposite-direction input end and an output end of the operational amplifier U700-B.
In one embodiment, the bias module includes a voltage regulator SHR700, a resistor R708, and a capacitor C702, where a cathode of the voltage regulator SHR700 is connected to one end of the resistor R708, and an R pole is connected to one end of the capacitor C702.
In one embodiment, the operational amplifier U700-A is model lm 358.
According to the switching circuit of the switch power supply indicator lamp, through the matched arrangement of the constant-current constant-voltage module, the bias module and the double indicator lamp module, when the sampling voltage of the double indicator lamp module is greater than the forward reference voltage, the voltage or the current of the switch power supply is in a safe state, and at the moment, the green lamp of the double indicator lamp module is turned on; when the sampling voltage of the double-indicator lamp module is smaller than the forward reference voltage, the voltage or the current of the switching power supply is in an overload state, and the red lamp of the double-indicator lamp module is turned on; the voltage or current of the switching power supply is too high at the moment, so that a user can quickly respond and timely process the voltage or current, the damage to a switching power supply circuit or a load is avoided, and the cost is saved.
Drawings
Fig. 1 is a circuit diagram of a switching circuit of a switching power supply indicator according to an embodiment of the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the switching circuit for the indicator light of the switching power supply comprises a constant current and constant voltage module 10, a bias module 20 and a double indicator light module 30, wherein the input end of the constant current and constant voltage module 10 is connected with the input end of the double indicator light module 30 through the bias module 20; the constant current and constant voltage module 10 includes a constant current module 11 and a constant voltage module 12.
The bias module 20 has a voltage stabilizing function, the double-indicator light module 30 obtains a forward reference voltage from the constant-current constant-voltage module 10, the double-indicator light module 30 obtains a sampling voltage from the outside, when the sampling voltage is greater than the forward reference voltage, the double-indicator light module 30 controls the green light to be turned on, and the switching power supply is in a safe state; when the sampling voltage is less than the forward reference voltage, the double-indicator light module 30 controls the red light to be turned on, the current or the voltage of the switching power supply at the moment exceeds the rated voltage value or the current value, the circuit is in an overload state, the red light is turned on to remind a user, and the circuit is in the overload state at the moment.
Thus, the switching circuit of the indicator light of the switching power supply is arranged by matching the constant-current constant-voltage module 10, the bias module 20 and the double-indicator-light module 30, when the sampling voltage of the double-indicator-light module 30 is greater than the forward reference voltage, the voltage or current of the switching power supply is in a safe state, and at the moment, a green light of the double-indicator-light module 30 is turned on; when the sampling voltage of the double-indicator light module 30 is smaller than the forward reference voltage, the voltage or current of the switching power supply is in an overload state, and at the moment, the red light of the double-indicator light module is turned on; the voltage or current of the switching power supply is too high at the moment, so that a user can quickly respond and timely process the voltage or current, the damage to a switching power supply circuit or a load is avoided, and the cost is saved.
Further, the dual indicator light module 30 includes an operational amplifier U700-a, a resistor R8A, a resistor R709, a resistor R710, a resistor R711, a resistor R712, a resistor R713, a resistor R714, a transistor Q702, a first light emitting diode 21, a second light emitting diode 32, and a capacitor C703, wherein one end of the resistor R709 is connected to the same-direction input end of the operational amplifier U700-a, one end of the resistor R710 is connected to the reverse-direction input end of the operational amplifier U700-a, an output end of the operational amplifier U700-a is connected to a common connection point between the first light emitting diode and the resistor R714, one end of the resistor R714 is connected to the resistor R713, a base of the transistor Q702 is connected to the common connection point between the resistor R713 and the resistor R714, a collector is connected to a cathode of the second light emitting diode, the resistor R711 and the capacitor C703 are connected in series to the reverse-direction input end and the output end of the operational amplifier U700-, The anode of the second light emitting diode is connected.
Further, the constant voltage module 12 includes a voltage regulator tube SHR80, a voltage regulator tube ZD80, a photocoupler U1-a, a resistor R80, a resistor R80A, a resistor R80B, a resistor R81, a resistor R83, an adjustable resistor VR, a capacitor C81, the resistor R80A, the adjustable resistor VR, and the resistor R80B are sequentially connected in series, a cathode of the voltage regulator tube SHR80 is connected with one end of the resistor R81, an R pole is connected with a common connection point between the adjustable resistor VR and the resistor R80B, the other end of the resistor R81 is connected with one end of the resistor R80, the other end of the resistor R80 is connected with an anode of the voltage regulator tube ZD80, the photocoupler U1-a is connected in parallel with the resistor R81, one end of the resistor R83 is connected with the cathode of the voltage regulator tube SHR80, and the other end of the capacitor C81.
Further, the constant current module 11 includes an operational amplifier U700-B, a diode D1, a resistor R7A, a resistor R700, a resistor R704, a resistor R707, and a capacitor C700, wherein a same-direction input end of the operational amplifier U700-B is connected to one end of the resistor R707, an opposite-direction input end is connected to one end of the resistor R700, an output end is connected to a negative electrode of the diode D1, one end of the resistor R7A is connected to the resistor R707, and the resistor R704 and the capacitor C700 are connected in series and are respectively connected to an opposite-direction input end and an output end of the operational amplifier U700-B.
The resistor R709 and the resistor R8A are constantly sampled from the bias module, and the sampled voltage is placed at the non-inverting input end of the operational amplifier U700-A and is used as a positive reference voltage; the resistor R711 and the capacitor C703 are connected in series and bridged at two ends of the output end and the reverse input end of the operational amplifier U700-A to serve as a negative feedback compensation circuit, so that the working state of the operational amplifier U700-A is stabilized; the resistor R710 samples the external current, and the formed sampling voltage is input to the reverse input end of the operational amplifier U700-A; when the sampling voltage is smaller than the forward reference voltage (the system works in a constant voltage or constant current state), the output end (PIN1) of the operational amplifier U700-A is at a high level, and the second light-emitting diode 32 is cut off; the high level is biased at the base of the transistor Q702 (reaching the conducting threshold voltage of the transistor Q702) through the resistor R714 and the resistor R713, the transistor Q702 is turned on, and the first light emitting diode 31 emits red light to play a role in indication; when the sampling voltage is greater than the forward reference voltage (the system works in a constant voltage or constant current state), the output end (PIN1) of the operational amplifier U700-A is at a low level, the second light-emitting diode 32 is conducted, and the indicator lamp emits green light; this high level biases PIN1 of transistor Q702 (which cannot reach the turn-on threshold voltage of transistor Q702) through resistor R714 and resistor R713, the transistor Q702 turns off, and the first light emitting diode 31 turns off.
Therefore, the operational amplifier U700-A, the first light emitting diode 31 and the second light emitting diode 32 are matched, whether the switching power supply is in a safe state or not can be judged by comparing the sampling voltage with the forward reference voltage, the switching power supply is effectively protected from being damaged, and the cost is saved.
The constant current and constant voltage state is determined by the constant voltage and constant current module 10. In the constant voltage state, the output voltage is constant and is set by the resistor R80A, the resistor VR and the resistor R80B in the constant voltage module 12; the color of the lamps of the dual indicator light module 30 can be switched by changing the values of the resistor R709 and the resistor R8A, and further changing the forward reference voltage.
Further, the bias module 20 includes a voltage regulator SHR700, a resistor R708, and a capacitor C702, where a cathode of the voltage regulator SHR700 is connected to one end of the resistor R708, and an R pole is connected to one end of the capacitor C702.
Further, the model of the operational amplifier U700-A is lm 358.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The utility model provides a switching power supply pilot lamp switching circuit which characterized in that: the constant current and constant voltage control system comprises a constant current and constant voltage module, a bias module and a double-indicator lamp module, wherein the input end of the constant current and constant voltage module is connected with the input end of the double-indicator lamp module through the bias module; the constant current and constant voltage module comprises a constant current module and a constant voltage module.
2. The switching circuit of claim 1, wherein: the double-indicator lamp module comprises an operational amplifier U700-A, resistors R8A, R709, R710, R711, R712, R713, R714, a triode Q702, a first light emitting diode, a second light emitting diode and a capacitor C703, wherein one end of the resistor R709 is connected with the homodromous input end of the operational amplifier U700-A, one end of the resistor R710 is connected with the reverse input end of the operational amplifier U700-A, the output end of the operational amplifier U700-A is connected with the common connection point between the first light emitting diode and the resistor R714, one end of the resistor R714 is connected with the resistor R713, the base of the triode Q702 is connected with the common connection point between the resistor R713 and the resistor R714, the collector is connected with the cathode of the second light emitting diode, the resistor R711 and the capacitor C703 are connected in series and are respectively connected with the reverse input end and the output end of the operational amplifier U700-A, one end of the resistor R712 is, The anode of the second light emitting diode is connected.
3. The switching circuit of claim 1, wherein: the constant voltage module comprises a voltage regulator tube SHR80, a voltage regulator tube ZD80, a photoelectric coupler U1-A, a resistor R80, a resistor R80A, a resistor R80B, a resistor R81, a resistor R83, an adjustable resistor VR, a capacitor C81, a resistor R80A, an adjustable resistor VR and a resistor R80B which are sequentially connected in series, wherein the cathode of the voltage regulator tube SHR80 is connected with one end of the resistor R81, the R pole is connected with a common connection point between the adjustable resistor VR and the resistor R80B, the other end of the resistor R81 is connected with one end of the resistor R80, the other end of the resistor R80 is connected with the anode of the voltage regulator tube ZD80, the photoelectric coupler U1-A is connected with the resistor R81 in parallel, one end of the resistor R83 is connected with the cathode of the voltage regulator tube SHR80, and the other end of.
4. The switching circuit of claim 1, wherein: the constant current module comprises an operational amplifier U700-B, a diode D1, a resistor R7A, a resistor R700, a resistor R704, a resistor R707 and a capacitor C700, wherein the same-direction input end of the operational amplifier U700-B is connected with one end of the resistor R707, the reverse-direction input end of the operational amplifier U700-B is connected with one end of the resistor R700, the output end of the operational amplifier U700-B is connected with the negative electrode of the diode D1, one end of the resistor R7A is connected with the resistor R707, and the resistor R704 and the capacitor C700 are connected in series and are respectively connected with the reverse-direction input end and.
5. The switching circuit of claim 1, wherein: the bias module comprises a voltage-regulator tube SHR700, a resistor R708 and a capacitor C702, wherein the cathode of the voltage-regulator tube SHR700 is connected with one end of the resistor R708, and the R pole is connected with one end of the capacitor C702.
6. The switching power supply indicator lamp switching circuit according to claim 2, wherein: the model number of the operational amplifier U700-A is lm 358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922322050.2U CN211928131U (en) | 2019-12-23 | 2019-12-23 | Switching circuit of switch power supply indicator lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922322050.2U CN211928131U (en) | 2019-12-23 | 2019-12-23 | Switching circuit of switch power supply indicator lamp |
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| Publication Number | Publication Date |
|---|---|
| CN211928131U true CN211928131U (en) | 2020-11-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922322050.2U Active CN211928131U (en) | 2019-12-23 | 2019-12-23 | Switching circuit of switch power supply indicator lamp |
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| Country | Link |
|---|---|
| CN (1) | CN211928131U (en) |
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Address after: Room 401, 4th Floor, No. 3 Shima Ping An Street, Junhe Street, Baiyun District, Guangzhou City, Guangdong Province, 510000 Patentee after: GUANGZHOU NENGZHIWEI ELECTRONICS CO.,LTD. Address before: 510000, 2nd Floor, Building B, Dalang Taiyangshen Industrial Zone, Xiahuayi Road, Baiyunhu Street, Baiyun District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU NENGZHIWEI ELECTRONICS CO.,LTD. |