CN212723158U - Constant current and constant voltage detection circuit based on MOS internal resistance - Google Patents
Constant current and constant voltage detection circuit based on MOS internal resistance Download PDFInfo
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- CN212723158U CN212723158U CN202021689457.5U CN202021689457U CN212723158U CN 212723158 U CN212723158 U CN 212723158U CN 202021689457 U CN202021689457 U CN 202021689457U CN 212723158 U CN212723158 U CN 212723158U
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Abstract
The utility model discloses a constant current constant voltage detection circuitry based on MOS internal resistance, including operational amplifier U1A, operational amplifier U1B, MOS pipe Q1, resistance R1, resistance R6, resistance R5, resistance R9, electric capacity C3, resistance R8, electric capacity C1, electric capacity C4. The utility model provides a constant current constant voltage detection circuitry based on MOS internal resistance, the efficiency of improvement circuit can not only better reduction circuit, can also make the circuit possess the ability of turn-off control simultaneously, better improvement the result of use of circuit, promoted the development of trade.
Description
Technical Field
The utility model belongs to the electronic circuit field specifically indicates a constant current constant voltage detection circuitry based on MOS internal resistance.
Background
With the rise of consumer products with batteries, various battery charger products need to satisfy a constant voltage and constant current charging state so as to prevent the battery charger products from damaging the service life of electronic products when the electronic products are charged. The circuits arranged in the existing battery charger complete constant-current and constant-voltage detection by detecting the voltage at two ends of the manganese-copper wire resistor, and the constant-current and constant-voltage detection performed by the manganese-copper wire resistor has large power loss and low efficiency, which is not beneficial to reducing the power consumption of the battery charger. How to optimize the circuit structure is the research and development direction of various enterprises nowadays.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned problem, provide a constant current constant voltage detection circuitry based on MOS internal resistance, the efficiency of improvement circuit can not only better reduction circuit, can also make the circuit possess turn-off control's ability simultaneously, better improvement the result of use of circuit, promoted the development of trade.
The purpose of the utility model is realized through the following technical scheme:
a constant current and voltage detection circuit based on MOS internal resistance comprises a transformer T1, a photoelectric coupler U2A, a polar capacitor CE1 with an A pole connected with the dotted terminal of a secondary inductance coil of the transformer T1 and a K pole as an OUT + output end, a diode D1 with an anode connected with the K pole of a diode D1 and a cathode connected with the non-dotted terminal of the secondary inductance coil of the transformer T1, a capacitor CY1 with one end connected with the cathode of the polar capacitor CE1 and the other end grounded, a resistor R3 with one end connected with the 1 pin of the photoelectric coupler U2A and the other end connected with the K pole of the diode D1, a resistor R2 with one end connected with the 2 pin of the photoelectric coupler U2A and the other end connected with the K pole of a diode D1, a capacitor C2 with one end connected with the K pole of the photoelectric coupler U2A and the other end connected with the K pole of the diode D1 sequentially through the resistor R7 and the resistor R4, and a photoelectric coupler U2 pin A, The A pole is connected with the analog ground, the R pole is connected with the unidirectional thyristor U3 connected with the A pole through a resistor R12, a resistor R11 arranged in parallel with the resistor R12, the K pole is connected with the diode D2 of the unidirectional thyristor U3, and a detection circuit is also connected between the negative pole of the polar capacitor CE1 and the A pole of the diode D2; the detection circuit comprises an operational amplifier U1A, an operational amplifier U1B, a MOS tube Q1, a resistor R1 with one end connected with the D pole of the MOS tube Q1 and the other end connected with the 5 pin of the operational amplifier U1B, a resistor R6 with one end connected with the 7 pin of the operational amplifier U1B and the other end connected with the 3 pin of the operational amplifier U1A, a resistor R5 with one end connected with a 2.5V reference voltage and the other end connected with the 6 pin of the operational amplifier U1B, a capacitor C3 with one end connected with the 5 pin of the operational amplifier U1B and the other end connected with the 6 pin of the operational amplifier U1B after passing through the resistor R9, a resistor R8 with one end connected with an analog ground and the other end connected with the 8 pin of the operational amplifier U1A, and a capacitor C1 with one end connected with the 3 pin of the operational amplifier U1A and the other end connected with the connection point of the capacitor C3 and the resistor R9, and an operational amplifier U1A, The other end of the capacitor C4 is connected with the 2 pin of the operational amplifier U1A after passing through a resistor R10.
Preferably, one end of the capacitor CY1, which is connected to the negative electrode of the polar capacitor CE1, is connected to an analog ground, and the dotted terminal and the non-dotted terminal of the primary inductor of the transformer T1 are used as power input ends.
Preferably, the S pole of the MOS transistor Q1 is connected to the negative pole of the polar capacitor CE1, and the D pole of the MOS transistor Q1 serves as the OUT-output terminal.
Preferably, pin 6 of the operational amplifier U1B is connected to pin 2 of the operational amplifier U1A, the output terminal of the operational amplifier U1A is connected to the a-pole of the diode D2, pin 8 of the operational amplifier U1A is connected to the positive pole of the polar capacitor CE1, and pin 4 of the operational amplifier U1A is connected to analog ground.
Preferably, the connection point of the capacitor C3 and the resistor R9 is connected to an analog ground.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses an effectual consumption that reduces the circuit of circuit structure improves the efficiency of circuit, can also make the circuit possess the ability of turn-off control simultaneously, the better result of use that has improved the circuit has promoted the development of trade.
Drawings
Fig. 1 is a circuit structure diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.
Examples
As shown in FIG. 1, a constant current and voltage detection circuit based on MOS internal resistance comprises a transformer T1, a photocoupler U2A, a diode D1 with an A pole connected with the dotted terminal of the secondary inductance coil of the transformer T1 and a K pole as the OUT + output terminal, a polar capacitor CE1 with an anode connected with the K pole of the diode D1 and a cathode connected with the non-dotted terminal of the secondary inductance coil of the transformer T1, a capacitor CY1 with one end connected with the cathode of the polar capacitor CE1 and the other end grounded, a resistor R3 with one end connected with the 1 pin of the photocoupler U2A and the other end connected with the K pole of the diode D1, a resistor R2 with one end connected with the 2 pin of the photocoupler U2A and the other end connected with the K pole of the diode D1, a capacitor C2 with one end connected with the 2 pin of the photocoupler U2A and the other end connected with the K pole of the diode D1 through a resistor R4, the K pole is connected with a 2 pin of a photocoupler U2A, the A pole is connected with analog ground, the R pole is connected with the A pole through a resistor R12, a unidirectional thyristor U3 is connected with the A pole, the resistor R11 is arranged in parallel with a resistor R12, the K pole is connected with the R pole of the unidirectional thyristor U3, and a detection circuit is also connected between the negative pole of the polar capacitor CE1 and the A pole of the diode D2; the detection circuit comprises an operational amplifier U1A, an operational amplifier U1B, a MOS tube Q1, a resistor R1 with one end connected with the D pole of the MOS tube Q1 and the other end connected with the 5 pin of the operational amplifier U1B, a resistor R6 with one end connected with the 7 pin of the operational amplifier U1B and the other end connected with the 3 pin of the operational amplifier U1A, a resistor R5 with one end connected with a 2.5V reference voltage and the other end connected with the 6 pin of the operational amplifier U1B, a capacitor C3 with one end connected with the 5 pin of the operational amplifier U1B and the other end connected with the 6 pin of the operational amplifier U1B after passing through the resistor R9, a resistor R8 with one end connected with an analog ground and the other end connected with the 8 pin of the operational amplifier U1A, and a capacitor C1 with one end connected with the 3 pin of the operational amplifier U1A and the other end connected with the connection point of the capacitor C3 and the resistor R9, and an operational amplifier U1A, The other end of the capacitor C4 is connected with the 2 pin of the operational amplifier U1A after passing through a resistor R10.
One end of the capacitor CY1, which is connected with the negative electrode of the polar capacitor CE1, is connected with the analog ground, and the dotted terminal and the non-dotted terminal of the primary inductor of the transformer T1 are used as power input ends. The S pole of the MOS transistor Q1 is connected with the negative pole of the polar capacitor CE1, and the D pole of the MOS transistor Q1 is used as an OUT-output end. The 6 pin of the operational amplifier U1B is connected with the 2 pin of the operational amplifier U1A, the output end of the operational amplifier U1A is connected with the A pole of the diode D2, the 8 pin of the operational amplifier U1A is connected with the anode of the polar capacitor CE1, and the 4 pin of the operational amplifier U1A is connected with the analog ground. The connection point of the capacitor C3 and the resistor R9 is connected with the analog ground.
The working principle of the detection circuit is as follows: in normal operation, a 2.5V reference voltage is divided by a resistor R5 and a resistor R9 to provide a reference voltage for a pin 2 of an operational amplifier U1A and a pin 6 of the operational amplifier U1B, the operational amplifier U1A and the operational amplifier U1B are turned off in opposite phases, when a battery load is plugged into the power supply, a current flows through an OUT-output terminal by a MOS transistor Q1, the voltage of the OUT-output terminal rises relative to the ground potential of the pin 2 of the operational amplifier U1A, the voltage is supplied to a pin 5 of the operational amplifier U1B by the resistor R1, when a constant current is larger than the set pin 6 of the operational amplifier U1B, a pin 7 of the operational amplifier U1B outputs a high level, the voltage is divided by the resistor R6 and the resistor R8 to a pin 3 of the operational amplifier U1A, the operational amplifier U1A is turned on in a forward direction, and a pin 1 of the operational amplifier U1A outputs a high level to control a constant voltage circuit of the output, when the turn-off control is needed, the single chip microcomputer can give a signal to control the operational amplifier U1B, so that the 7 pin of the operational amplifier U1B outputs low level, and the MOS transistor Q1 is turned off.
As described above, the utility model discloses alright fine realization.
Claims (5)
1. A constant current and voltage detection circuit based on MOS internal resistance comprises a transformer T1, a photoelectric coupler U2A, a polar capacitor CE1 with an A pole connected with the dotted terminal of a secondary inductance coil of the transformer T1 and a K pole as an OUT + output end, a diode D1 with an anode connected with the K pole of a diode D1 and a cathode connected with the non-dotted terminal of the secondary inductance coil of the transformer T1, a capacitor CY1 with one end connected with the cathode of the polar capacitor CE1 and the other end grounded, a resistor R3 with one end connected with the 1 pin of the photoelectric coupler U2A and the other end connected with the K pole of the diode D1, a resistor R2 with one end connected with the 2 pin of the photoelectric coupler U2A and the other end connected with the K pole of a diode D1, a capacitor C2 with one end connected with the K pole of the photoelectric coupler U2A and the other end connected with the K pole of the diode D1 sequentially through the resistor R7 and the resistor R4, and a photoelectric coupler U2 pin A, The A pole is connected with analog ground, the R pole is connected with the unidirectional thyristor U3 connected with the A pole through a resistor R12, the resistor R11 is connected with a resistor R12 in parallel, and the K pole is connected with the R pole of the unidirectional thyristor U3 through a diode D2, and the circuit is characterized in that: a detection circuit is also connected between the negative electrode of the polar capacitor CE1 and the A electrode of the diode D2; the detection circuit comprises an operational amplifier U1A, an operational amplifier U1B, a MOS tube Q1, a resistor R1 with one end connected with the D pole of the MOS tube Q1 and the other end connected with the 5 pin of the operational amplifier U1B, a resistor R6 with one end connected with the 7 pin of the operational amplifier U1B and the other end connected with the 3 pin of the operational amplifier U1A, a resistor R5 with one end connected with a 2.5V reference voltage and the other end connected with the 6 pin of the operational amplifier U1B, a capacitor C3 with one end connected with the 5 pin of the operational amplifier U1B and the other end connected with the 6 pin of the operational amplifier U1B after passing through the resistor R9, a resistor R8 with one end connected with an analog ground and the other end connected with the 8 pin of the operational amplifier U1A, and a capacitor C1 with one end connected with the 3 pin of the operational amplifier U1A and the other end connected with the connection point of the capacitor C3 and the resistor R9, and an operational amplifier U1A, The other end of the capacitor C4 is connected with the 2 pin of the operational amplifier U1A after passing through a resistor R10.
2. The MOS internal resistance-based constant-current and constant-voltage detection circuit as claimed in claim 1, wherein: one end of the capacitor CY1, which is connected with the negative electrode of the polar capacitor CE1, is connected with the analog ground, and the dotted terminal and the non-dotted terminal of the primary inductor of the transformer T1 are used as power input ends.
3. The MOS internal resistance-based constant-current and constant-voltage detection circuit as claimed in claim 2, wherein: the S pole of the MOS transistor Q1 is connected with the negative pole of the polar capacitor CE1, and the D pole of the MOS transistor Q1 is used as an OUT-output end.
4. The MOS internal resistance-based constant-current and constant-voltage detection circuit as claimed in claim 3, wherein: the 6 pin of the operational amplifier U1B is connected with the 2 pin of the operational amplifier U1A, the output end of the operational amplifier U1A is connected with the A pole of the diode D2, the 8 pin of the operational amplifier U1A is connected with the anode of the polar capacitor CE1, and the 4 pin of the operational amplifier U1A is connected with the analog ground.
5. The MOS internal resistance-based constant-current and constant-voltage detection circuit as claimed in claim 4, wherein: the connection point of the capacitor C3 and the resistor R9 is connected with the analog ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689457.5U CN212723158U (en) | 2020-08-13 | 2020-08-13 | Constant current and constant voltage detection circuit based on MOS internal resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689457.5U CN212723158U (en) | 2020-08-13 | 2020-08-13 | Constant current and constant voltage detection circuit based on MOS internal resistance |
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| Publication Number | Publication Date |
|---|---|
| CN212723158U true CN212723158U (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021689457.5U Active CN212723158U (en) | 2020-08-13 | 2020-08-13 | Constant current and constant voltage detection circuit based on MOS internal resistance |
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| CN (1) | CN212723158U (en) |
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- 2020-08-13 CN CN202021689457.5U patent/CN212723158U/en active Active
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Address after: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee after: Dongke semiconductor (Anhui) Co.,Ltd. Address before: Room 101-401, building 38, digital Silicon Valley Industrial Park, No. 999, Yinhuang East Road, Maanshan economic and Technological Development Zone, 243000, Anhui Province Patentee before: ANHUI DONGKE SEMICONDUCTOR Co.,Ltd. |
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