CN212992031U - Linear power supply power-off detection circuit - Google Patents
Linear power supply power-off detection circuit Download PDFInfo
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- CN212992031U CN212992031U CN202021605369.2U CN202021605369U CN212992031U CN 212992031 U CN212992031 U CN 212992031U CN 202021605369 U CN202021605369 U CN 202021605369U CN 212992031 U CN212992031 U CN 212992031U
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Abstract
The utility model relates to a linear power supply loses electric detection circuitry, including full wave rectifier circuit, half-wave rectifier circuit, SS12 diode D2, S-80146CLMC-JIZ fall electric detection circuitry, by backup power supply control circuit and MCU of MCU control, diode D2 'S positive pole falls electric detection circuitry with half-wave rectifier circuit, S-80146CLMC-JIZ respectively and is connected, diode D2' S negative pole is connected with full wave rectifier circuit, backup power supply control circuit respectively, MCU falls electric detection circuitry with backup power supply control circuit, S-80146CLMC-JIZ respectively and is connected. The utility model discloses can be in the half-wave rectifier circuit when mains voltage reduces to 4.6V, the mains voltage who inputs in the DC power supply DC12V-24V network still keeps between 4.0V ~4.3V, can also guarantee the stability of system 3.3V power, this has guaranteed to receive the signal of losing power before 3.3V system stop work, thereby can in time open reserve battery power, guaranteed that the system can accomplish follow-up operation after losing power.
Description
Technical Field
The utility model belongs to circuit detection area, concretely relates to linear power supply loses electric detection circuitry.
Background
The existing linear power supply has the advantages of simple structure, small output ripple, small high-frequency interference and the like, and is widely used. Unexpected power failure is also an unavoidable condition in the power utilization process, and a power failure detection circuit is needed in order to enable a system to acquire power failure information in time. Through the information fed back by the power-off detection circuit, the MCU can timely control the switching of the backup power supply and save and process important data, and can timely report power-off information.
In a system using a linear transformer as a power supply, a plurality of power supplies are usually used in a main system, and generally, there are a 3.3V system power supply, a 4.0V remote module power supply and a 5.0V USB interface power supply. The three power supplies are from the same transformer output end, and the output power supply is subjected to full-wave rectification to obtain a direct-current power supply DC12V-24V with a larger fluctuation range. The DC12V-24V is converted into a 3.3V power supply and a 4.0V power supply through two DC-DC circuits, and a 5.0V power supply is obtained through the LDO.
In general, the power loss detection circuit adopts a voltage detection chip of model 80146, and the input voltage threshold of the power loss detection circuit is 4.6V. When the linear power supply is out of point, a backup battery power supply needs to be put into the system in order to maintain the normal operation of the system. The MCU will switch the battery backup power to the network of DC power supplies DC12V-24V through a control switching circuit. The DC power supply DC12V-24V has a backup battery for supplying power after the system is powered off, so the power supply can not be used as a network node for detecting the power off.
Because the input range of the linear transformer is large, the voltage range after rectification output is also large in variation, the front end of the linear transformer is connected in series in the DC12V-24V for detection, and the signal output by the circuit form of the diode for supplying power at the rear end is not suitable for being used as the detected signal.
One path of output of the linear transformer is output to the whole system through a full-wave rectification loop and is output to the USB interface through a half-wave rectification loop to supply power, wherein the USB interface is low in use frequency and low in power consumption.
When the linear transformer loses power, no matter the full-wave rectification loop or the half-wave rectification loop loses power, and loses power at the same time, after the linear power supply loses power, because the power consumption of the half-wave rectification loop is too small, the stored electric quantity is consumed too slowly, when the voltage of the full-wave rectification loop can not maintain 3.3V, the power loss signal of the half-wave rectification loop is not sent, and the problem of untimely power loss detection occurs.
Disclosure of Invention
In order to solve the problem, the utility model provides a linear power supply loses electric detection circuitry can guarantee to receive the signal of losing electricity before 3.3V system stop work to can in time open reserve battery power, guarantee that the system can accomplish a series of operations after losing the electricity.
The technical scheme of the utility model as follows:
a linear power supply power failure detection circuit comprises a full-wave rectification circuit, a half-wave rectification circuit, an SS12 diode D2, an S-80146CLMC-JIZ power failure detection circuit, a backup power supply control circuit and an MCU, wherein the backup power supply control circuit is controlled by the MCU, the anode of the diode D2 is respectively connected with the half-wave rectification circuit and the S-80146CLMC-JIZ power failure detection circuit, the cathode of the diode D2 is respectively connected with the full-wave rectification circuit and the backup power supply control circuit, and the MCU is respectively connected with the backup power supply control circuit and the S-80146CLMC-JIZ power failure detection circuit.
Preferably, the full-wave rectification circuit comprises a rectification bridge B1, one end of the rectification bridge B1 is connected with a transformer T1, a capacitor C1 is connected in parallel between the rectification bridge B1 and the transformer T1, the capacitor C1 is connected to an alternating current power supply AC, the other end of the rectification bridge B is connected with a capacitor C2, an electrolytic capacitor C3 is connected in parallel on the capacitor C2, the positive electrode of the electrolytic capacitor C3 is connected to a direct current power supply DC, and the negative electrode of the electrolytic capacitor C3 is grounded.
Preferably, the half-wave rectification circuit comprises a linear voltage regulation chip U1, an input end Vin of the linear voltage regulation chip U1 is connected to an alternating current power supply AC through a diode D1, an electrolytic capacitor C4 and a capacitor C5 are connected in parallel between a cathode of the diode and the input end Vin of the linear voltage regulation chip U1, and a cathode of the electrolytic capacitor C4 is grounded; the output end Vout of the linear voltage-stabilizing chip U1 is grounded through a capacitor C6, two ends of the capacitor C6 are also connected with an electrolytic capacitor C7 in parallel, and the negative electrode of the electrolytic capacitor C7 is grounded; the common terminal of the linear regulator chip U1 is grounded.
Preferably, the S-80146CLMC-JIZ power down detection circuit comprises a power down detection chip U2, a VSS pin and a DS pin of the power down detection chip U2 are grounded in parallel, a VDD pin of the power down detection chip U2 is connected to the USB5V power supply circuit, and the pin VDD is also grounded through a capacitor C8; the OUT pin of the power-down detection chip U2 is grounded through a resistor R2 and a resistor R1, and an int pin 4 of the MCU is arranged between the resistor R1 and the resistor R2.
Preferably, the backup power control circuit comprises a switching transistor Q2, an emitter of the switching transistor Q2 is grounded, a base of a switching transistor Q2 of the switching transistor Q2 is grounded through a resistor R5, and a base of a switching transistor Q2 is further connected to an output control pin 5 of the MCU through a resistor R4; the collector of the switching transistor Q2 is connected to the gate of a mos transistor Q1, the drain of the mos transistor Q1 is connected to a direct current power supply DC, and the source of the mos transistor Q1 is connected to a backup power supply; the collector of the switching transistor Q2 is also connected to a backup power supply via a resistor R3.
Preferably, the direct current power supply DC is direct current power supply DC 12V/24V.
The utility model has the advantages that: the utility model discloses utilize germanium tube SS12 diode of low-voltage difference, when supply voltage reduced to 4.6V in the half-wave rectification return circuit, the supply voltage who inputs to DC power supply DC12V-24V network still keeps between 4.0V ~4.3V, can also guarantee the stability of system 3.3V power, this has guaranteed to receive the signal of losing power before 3.3V system stops working, thereby can open backup battery power in time, guaranteed that the system can accomplish follow-up operation after losing power; the utility model discloses still have the circuit simple, reliable and stable, save the cost, save space's advantage.
Drawings
Fig. 1 is the circuit schematic diagram of the power failure detection circuit of the linear power supply provided by the utility model.
Fig. 2 is a schematic circuit diagram of a full-wave rectifier circuit.
Fig. 3 is a schematic circuit diagram of a half-wave rectifier circuit.
FIG. 4 is a circuit schematic of the S-80146CLMC-JIZ power down detection circuit.
Fig. 5 is a circuit schematic of a backup power control circuit controlled by the MCU.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the embodiment of the utility model provides a linear power supply loses electric detection circuitry, including full wave rectifier circuit, half-wave rectifier circuit, SS12 diode D2, S-80146CLMC-JIZ falls electric detection circuitry, by MCU controlled backup power supply control circuit and MCU, diode D2 'S positive pole respectively with half-wave rectifier circuit, S-80146CLMC-JIZ falls electric detection circuitry and is connected, diode D2' S negative pole respectively with full wave rectifier circuit, backup power supply control circuit is connected, MCU respectively with backup power supply control circuit, S-80146CLMC-JIZ falls electric detection circuitry and is connected.
As shown in fig. 2, the full-wave rectification circuit includes a rectification bridge B1, one end of the rectification bridge B1 is connected to the transformer T1, a capacitor C1 is connected in parallel between the rectification bridge B1 and the transformer T1, the capacitor C1 is connected to the AC power supply AC, the other end of the rectification bridge B is connected to the capacitor C2, an electrolytic capacitor C3 is connected in parallel to the capacitor C2, the positive electrode of the electrolytic capacitor C3 is connected to the DC power supply DC, and the negative electrode of the electrolytic capacitor C3 is grounded.
As shown in fig. 3, the half-wave rectifier circuit includes a linear regulator chip U1, an input terminal Vin of the linear regulator chip U1 is connected to an alternating current power supply AC through a diode D1, an electrolytic capacitor C4 and a capacitor C5 are connected in parallel between a cathode of the diode and the input terminal Vin of the linear regulator chip U1, and a cathode of the electrolytic capacitor C4 is grounded; the output end Vout of the linear voltage-stabilizing chip U1 is grounded through a capacitor C6, two ends of a capacitor C6 are also connected with an electrolytic capacitor C7 in parallel, and the negative electrode of the electrolytic capacitor C7 is grounded; the common terminal of the linear regulator chip U1 is grounded.
As shown in fig. 4, the S-80146CLMC-JIZ power down detection circuit includes a power down detection chip U2, a VSS pin and a DS pin of the power down detection chip U2 are grounded in parallel, a VDD pin of the power down detection chip U2 is connected to the USB5V power supply circuit, and the VDD pin is also grounded via a capacitor C8; the OUT pin of the power-down detection chip U2 is grounded through a resistor R2 and a resistor R1, and an int pin 4 of the MCU is arranged between the resistor R1 and the resistor R2.
The backup power supply control circuit comprises a switching triode Q2, the emitter of the switching triode Q2 is grounded, the base of a switching triode Q2 of a switching triode Q2 is grounded through a resistor R5, and the base of a switching triode Q2 is also connected to an output control pin 5 (BAT ON in the figure) of the MCU through a resistor R4; the collector of the switching triode Q2 is connected to the gate of the mos transistor Q1, the drain of the mos transistor Q1 is connected to the DC power supply DC, and the source of the mos transistor Q1 is connected to the backup power supply (BAT +; the collector of the switching transistor Q2 is also connected to a backup power supply (i.e., BAT + in the figure) via a resistor R3.
As an embodiment of the utility model, still include a 5V's USB circuit, connect between pin Vout and electric capacity C6 of the linear steady voltage chip U1 in the half-wave detection circuit.
As an embodiment of the present invention, the DC power supply DC used is DC power supply DC 12V/24V.
The utility model discloses the theory of operation does: the output of the transformer is used as one path, the whole system is powered through a full-wave rectification output, the USB interface is powered through a half-wave rectification output, the USB interface is not very high in use frequency, and the power consumption is very low. After the linear transformer loses power, no matter the full-wave rectification loop or the half-wave rectification loop loses power, and loses power at the same time, at the moment, the power stored by the half-wave rectification loop is led into a direct current power supply DC12V-24V network node through an SS12 diode D2, and as the adopted diode is an SS12 germanium tube with low voltage difference, when the power voltage in the half-wave rectification loop is reduced to 4.6V, the power voltage input into the direct current power supply DC12V-24V network still has 4.0-4.3V, and the stability of a system 3.3V power supply can be ensured. The power-off signal is received before the 3.3V system stops working, so that the backup power supply is timely turned on, and the system can complete a series of operations after power-off.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the present invention. Are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The linear power supply power failure detection circuit is characterized by comprising a full-wave rectification circuit, a half-wave rectification circuit, an SS12 diode D2, an S-80146CLMC-JIZ power failure detection circuit, a backup power supply control circuit controlled by an MCU and the MCU, wherein the anode of the diode D2 is respectively connected with the half-wave rectification circuit and the S-80146CLMC-JIZ power failure detection circuit, the cathode of the diode D2 is respectively connected with the full-wave rectification circuit and the backup power supply control circuit, and the MCU is respectively connected with the backup power supply control circuit and the S-80146CLMC-JIZ power failure detection circuit.
2. The power loss detection circuit of claim 1, wherein the full-wave rectification circuit comprises a rectification bridge B1, one end of the rectification bridge B1 is connected with a transformer T1, a capacitor C1 is connected between the rectification bridge B1 and the transformer T1 in parallel, the capacitor C1 is connected to an alternating current power supply AC, the other end of the rectification bridge B is connected with a capacitor C2, an electrolytic capacitor C3 is connected to the capacitor C2 in parallel, the positive electrode of the electrolytic capacitor C3 is connected to a direct current power supply DC, and the negative electrode of the electrolytic capacitor C3 is grounded.
3. The linear power loss detection circuit as claimed in claim 1, wherein the half-wave rectification circuit comprises a linear voltage regulation chip U1, the input terminal Vin of the linear voltage regulation chip U1 is connected to the AC power source AC through a diode D1, an electrolytic capacitor C4 and a capacitor C5 are connected in parallel between the cathode of the diode and the input terminal Vin of the linear voltage regulation chip U1, and the cathode of the electrolytic capacitor C4 is grounded; the output end Vout of the linear voltage-stabilizing chip U1 is grounded through a capacitor C6, two ends of the capacitor C6 are also connected with an electrolytic capacitor C7 in parallel, and the negative electrode of the electrolytic capacitor C7 is grounded; the common terminal of the linear regulator chip U1 is grounded.
4. The power loss detection circuit of claim 1, wherein the power loss detection circuit of S-80146CLMC-JIZ comprises a power loss detection chip U2, a VSS pin and a DS pin of the power loss detection chip U2 are grounded in parallel, a VDD pin of the power loss detection chip U2 is connected to a USB5V power circuit, and a pin VDD is grounded via a capacitor C8; the OUT pin of the power-down detection chip U2 is grounded through a resistor R2 and a resistor R1, and an int pin 4 of the MCU is arranged between the resistor R1 and the resistor R2.
5. The power loss detection circuit of claim 1, wherein the backup power control circuit comprises a switching transistor Q2, the emitter of the switching transistor Q2 is grounded, the base of the switching transistor Q2 of the switching transistor Q2 is grounded via a resistor R5, and the base of the switching transistor Q2 is further connected to the output control pin 5 of the MCU via a resistor R4; the collector of the switching transistor Q2 is connected to the gate of a mos transistor Q1, the drain of the mos transistor Q1 is connected to a direct current power supply DC, and the source of the mos transistor Q1 is connected to a backup power supply; the collector of the switching transistor Q2 is also connected to a backup power supply via a resistor R3.
6. The power loss detection circuit as claimed in claim 2 or 5, wherein the DC power supply DC is DC 12V/24V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021605369.2U CN212992031U (en) | 2020-08-05 | 2020-08-05 | Linear power supply power-off detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021605369.2U CN212992031U (en) | 2020-08-05 | 2020-08-05 | Linear power supply power-off detection circuit |
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| CN212992031U true CN212992031U (en) | 2021-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189536A (en) * | 2021-05-31 | 2021-07-30 | 宁波迦南智能电气股份有限公司 | Power failure detection method and circuit for intelligent meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189536A (en) * | 2021-05-31 | 2021-07-30 | 宁波迦南智能电气股份有限公司 | Power failure detection method and circuit for intelligent meter |
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