CN210640811U - A switching power supply circuit that can detect current - Google Patents
A switching power supply circuit that can detect current Download PDFInfo
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- CN210640811U CN210640811U CN201921155338.9U CN201921155338U CN210640811U CN 210640811 U CN210640811 U CN 210640811U CN 201921155338 U CN201921155338 U CN 201921155338U CN 210640811 U CN210640811 U CN 210640811U
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Abstract
The utility model relates to a detectable electric current's switching power supply circuit, including current detection circuit, logic control circuit and switching power supply main circuit, current detection circuit's input is connected with the output electricity of switching power supply main circuit, and current detection circuit's output is connected with the signal input part electricity all the way of logic control circuit, and CPU control signal inserts logic control circuit's another way signal input part, and logic control circuit's output is connected with the input electricity of switching power supply main circuit. The utility model discloses a current detection circuit gathers the current signal of the external output of switching power supply main circuit to carry out logic comparison with it and CPU control signal through logic control circuit, thereby output logic level signal as the control signal of control switch power supply main circuit, with the operating condition of control switch power supply main circuit, thereby guaranteed that whole switching power supply circuit can not appear the phenomenon that excessive pressure overflows, whole circuit energy consumption is low, it is high to detect the precision, and the power supply is stable.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a switching power supply circuit of detectable electric current.
Background
The integration level and precision of integrated circuit chips in the existing intelligent electronic and communication equipment are higher and higher, the requirements on power supplies are higher and higher, and the intelligent electronic and communication equipment is mainly characterized by low energy consumption, high precision and stable power supply. Therefore, the output voltage and current of the switching power supply are required to be kept stable, and no overvoltage or overcurrent phenomenon exists, but a switching power supply circuit capable of detecting whether the current is in a set range is not provided in the prior art, so that the output current of the switching power supply cannot be found in time when the output current fluctuates or even exceeds the set range, and certain influence is brought to the safety and the stability of the switching power supply in practical application. If the output current of the switching power supply needs to be detected, an external current detection circuit is usually needed, so that the detection is very troublesome and the detection precision cannot be guaranteed.
Disclosure of Invention
The utility model aims to solve the technical problem that to the not enough of above-mentioned prior art, a detectable electric current's switching power supply circuit is provided.
The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a detectable current's switching power supply circuit, includes current detection circuit, logic control circuit and switching power supply main circuit, current detection circuit's input with the output electricity of switching power supply main circuit is connected and is gathered the current signal of switching power supply main circuit, current detection circuit's output with logic control circuit's signal input part electricity all the way is connected, and the access of CPU control signal another way signal input part of logic control circuit, logic control circuit's output with the input electricity of switching power supply main circuit is connected, the external steady voltage that exports of switching power supply main circuit.
The utility model has the advantages that: the utility model discloses a detectable current's switching power supply circuit, through the current detection circuit gathers the external current signal of output of switching power supply main circuit, and pass through logic control circuit carries out logic comparison with it and CPU control signal to output logic level signal as control the control signal of switching power supply main circuit to the operating condition of control switching power supply main circuit realizes switching power supply main circuit output current's detection, and the operating condition of automatic control switching power supply main circuit when the electric current is not at the within range of settlement, thereby has guaranteed that whole switching power supply circuit can not appear the phenomenon of excessive pressure overcurrent, and whole circuit energy consumption is low, the detection precision is high, and the power supply is stable.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further: the current detection circuit comprises a comparison amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2 and a capacitor C3, wherein a positive power supply input end of the comparison amplifier U1 is electrically connected with a current detection positive terminal VIN + VIN of the switching power supply main circuit through the resistor R1, a negative power supply input end of the comparison amplifier U1 is electrically connected with a current detection negative terminal VIN-of the switching power supply main circuit through the resistor R2, the capacitor C1 is electrically connected between the positive power supply input end and the negative power supply input end of the comparison amplifier U1, a comparison signal input end of the comparison amplifier U1 is grounded through the resistor R3, the resistor R4 and the resistor R5 are sequentially connected in series between a comparison voltage input end and an amplification signal output end of the comparison amplifier U1, a ground end of the comparison amplifier U1 is grounded, the comparison signal output end of the comparison amplifier U1 is electrically connected with the input end of the logic control circuit, the power supply input end of the comparison amplifier U1 is electrically connected with an external power supply, and the capacitor C2 and the capacitor C3 are connected between the power supply input end of the comparison amplifier U1 and the ground in parallel.
The beneficial effects of the further scheme are as follows: the current quantity output by the current detection end of the main circuit of the switching power supply can be converted into a voltage quantity through the comparison amplifier U1, and then the voltage quantity is compared and amplified with the internal reference voltage of the comparison amplifier U1, so that the subsequent logic control circuit can perform logic operation on the voltage quantity and the CPU control signal to generate a logic level signal for controlling the main circuit of the switching power supply.
Further: the current detection circuit further comprises a work reset circuit, the output end of the work reset circuit is electrically connected with the reset reverse input end of the comparison amplifier U1, the input end of the work reset circuit is electrically connected with an external power supply, and the reference judgment condition control end of the work reset circuit is electrically connected with the comparison output end of the comparison amplifier U1.
The beneficial effects of the further scheme are as follows: the work reset circuit can automatically reset when the voltage output by the comparison output end of the comparison amplifier U1 is abnormal, so that the normal work of the current detection circuit is ensured, and the stability of the whole circuit is improved.
Further: the work reset circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a diode D1 and a triode Q1, the capacitor C4 is electrically connected between the reset input end of the comparison amplifier U1 and the ground, the reset input end of the comparison amplifier U1 is electrically connected with the cathode of the diode D1, the resistor R6 is electrically connected between the anode and the cathode of the diode D1, the anode of the diode D1 is electrically connected with the external power supply through the resistor R7, the anode of the diode is also electrically connected with the collector of the triode Q1, the emitter of the transistor Q1 is grounded, the capacitor C5 and the resistor R10 are connected in parallel between the base of the transistor Q1 and the ground, the resistor R9 and the resistor R8 are connected in series between the base of the triode Q1 and an external power supply in sequence, and the common terminal of the resistor R9 and the resistor R8 is electrically connected with the comparison output terminal of the comparison amplifier U1.
Further: the logic control circuit comprises an OR gate chip U2, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a triode Q2 and a triode Q3, a comparison output end of the comparison amplifier U1 is electrically connected with one input end of the OR gate chip U2 through the resistor R11, a CPU control signal is connected to the other input end of the OR gate chip U2, the other input end of the OR gate chip U2 is grounded through the resistor R13, a ground end of the OR gate chip U2 is grounded, a power supply input end of the OR gate chip U2 is electrically connected with an external power supply, a power supply input end of the OR gate U2 is electrically connected with a ground, and a resistor C2 or a triode Q2 is electrically connected with a base of the resistor C2 or a resistor R2, the R16 and the capacitor C18 are connected in parallel between the base electrode and the emitter electrode of the triode Q2, the emitter of the triode Q2 is grounded, the resistor R14 and the resistor R17 are connected in series between the base and the collector of the triode Q2 in sequence, the collector of the transistor Q2 is electrically connected with the base of the transistor Q3 through the resistor R18, the common end of the resistor R14 and the resistor R17 is electrically connected with an external power supply, the resistor R19 is electrically connected between the emitter of the triode Q3 and the external power supply, the capacitor C9, the resistor R20 and the resistor R21 are connected between the external power supply and the ground in parallel, the resistor R22, the resistor R23 and the resistor R24 are sequentially connected between the external power supply and the ground in series, the common terminal of the resistor R22 and the resistor R23 is electrically connected with the collector of the triode Q3, and the common end of the resistor R22 and the resistor R23 is electrically connected with the input control end of the switching power supply main circuit.
The beneficial effects of the further scheme are as follows: the logic control circuit can perform OR logic operation on the output signal of the comparison amplifier U1 and a CPU control signal and generate a corresponding logic level signal to control the working state of the main circuit of the switching power supply, so that the whole switching power supply circuit outputs stable voltage and current.
Further: the switching power supply main circuit comprises a capacitor C10, a diode D10, a MOS tube Q10, a resistor R10 and a resistor R10, wherein the cathode of the diode D10 is electrically connected with an external power supply, the anode of the diode D10 is electrically connected with the gate of the MOS tube Q10 through the resistor R10, the capacitor C10 is connected in parallel with two ends of the diode D10, the resistor R10 and the capacitor C10 are sequentially connected in series between the gate and the drain of the MOS tube Q10, the drain of the MOS tube Q10 is connected with the external power supply in series with the capacitor C10 and the resistor R10, the drain of the transistor Q10 is connected in parallel with the anode of the triode D10 through the capacitor C10, the anode of the MOS tube Q10 is electrically connected in series with the anode of the triode D10, and the MOS tube D10, the anode of the triode D10 is electrically connected with the external power supply in series, and the anode of, the diode D4 and the capacitor C13 are connected in parallel between the negative electrode of the triode D3 and the ground, the drain electrode of the MOS tube Q4 is electrically connected with the positive power supply input end of the current detection circuit as the positive current detection terminal VIN +, and the positive electrode of the triode D3 is electrically connected with the negative power supply input end of the current detection circuit as the negative current detection terminal VIN-.
The beneficial effects of the further scheme are as follows: by controlling the working state of the MOS transistor Q4 according to the logic level signal output by the logic control circuit, the MOS transistor Q4 is enabled to be switched on and output stable voltage current, or the MOS transistor Q4 is enabled to be switched off and output current-limited or not output voltage current.
Drawings
Fig. 1 is a block diagram of a switching power supply circuit capable of detecting current according to the present invention;
fig. 2 is a schematic circuit diagram of a current detection circuit capable of detecting current according to the present invention;
fig. 3 is a schematic circuit diagram of a current-detectable logic control circuit according to the present invention;
fig. 4 is a schematic circuit diagram of the main circuit of the switching power supply capable of detecting current according to the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a switching power supply circuit capable of detecting current includes a current detection circuit, a logic control circuit and a switching power supply main circuit, an input end of the current detection circuit is electrically connected with an output end of the switching power supply main circuit and collects a current signal of the switching power supply main circuit, an output end of the current detection circuit is electrically connected with one signal input end of the logic control circuit, a CPU control signal is connected to the other signal input end of the logic control circuit, an output end of the logic control circuit is electrically connected with an input control end of the switching power supply main circuit, and the switching power supply main circuit outputs a stable voltage to the outside.
The utility model discloses a detectable current's switching power supply circuit, through the current detection circuit gathers the external current signal of output of switching power supply main circuit, and pass through logic control circuit carries out logic comparison with it and CPU control signal to output logic level signal as control the control signal of switching power supply main circuit to the operating condition of control switching power supply main circuit realizes switching power supply main circuit output current's detection, and the operating condition of automatic control switching power supply main circuit when the electric current is not at the within range of settlement, thereby has guaranteed that whole switching power supply circuit can not appear the phenomenon of excessive pressure overcurrent, and whole circuit energy consumption is low, the detection precision is high, and the power supply is stable.
The specific circuit structures of the current detection circuit, the logic control circuit and the main circuit of the switching power supply in the switching power supply circuit capable of detecting current will be described in detail below.
As shown in fig. 2, in one or more embodiments of the present invention, the current detection circuit includes a comparison amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2 and a capacitor C3, a positive power input terminal of the comparison amplifier U1 is electrically connected to a positive current detection terminal VIN + of the main circuit of the switching power supply through the resistor R1, a negative power input terminal of the comparison amplifier U1 is electrically connected to a negative current detection terminal VIN-of the main circuit of the switching power supply through the resistor R2, the capacitor C1 is electrically connected between the positive power input terminal and the negative power input terminal of the comparison amplifier U1, a comparison signal input terminal of the comparison amplifier U1 is grounded through the resistor R3, the resistor R4 and the resistor R5 are sequentially connected in series between the comparison voltage input terminal and the amplified signal output terminal of the comparison amplifier U1, the ground terminal of the comparison amplifier U1 is grounded, the comparison signal output terminal of the comparison amplifier U1 is electrically connected with the input terminal of the logic control circuit, the power supply input terminal of the comparison amplifier U1 is electrically connected with an external power supply +3V3, and the capacitor C2 and the capacitor C3 are connected in parallel between the power supply input terminal of the comparison amplifier U1 and the ground.
The current quantity output by the current detection end of the main circuit of the switching power supply can be converted into a voltage quantity through the comparison amplifier U1, and then the voltage quantity is compared and amplified with the internal reference voltage of the comparison amplifier U1, so that the subsequent logic control circuit can perform logic operation on the voltage quantity and the CPU control signal to generate a logic level signal for controlling the main circuit of the switching power supply.
The utility model discloses in, INA200AID chip that comparison amplifier U1 adopted the production of Texas instrument, INA200AID is the parallelly connected monitor of a high side measuring current and has the amplifier that the comparator of opening a way and reference is opened a way to the drain electrode, and its characteristics have: complete current sensing solution, 0.6V internal reference voltage, internal open drain comparison, latching capability comparator, common mode voltage range: -16V to +80V, high accuracy: 3.5% maximum error ultrahigh temperature, 500KHZ bandwidth, quiescent current: a maximum of 1800 mA.
The utility model discloses in, resistance R1, R2 constitutes common mode voltage input circuit with electric capacity C1, current detection circuit main function is with MOS pipe Q4's in the switching power supply main circuit drain current volume change voltage volume VIN +, VIN-, and through the chip inside common mode amplifier G after from 2 feet (OUT end) through resistance R3, R4, R5 partial pressure to 3 feet (CMPIN) input, carry OUT comparison with the inside reference voltage of 0.6V and amplify, INA200AID chip amplifier circuit's magnification power value is 20 (doubly), then export logic or door chip U2 and carry OUT logic calculation.
Preferably, in one or more embodiments of the present invention, the current detection circuit further includes a work reset circuit, an output end of the work reset circuit is electrically connected to the reset reverse input end of the comparison amplifier U1, an input end of the work reset circuit is electrically connected to the +3V3 of the external power supply, and a reference judgment condition control end of the work reset circuit is electrically connected to the comparison output end of the comparison amplifier U1.
The work reset circuit can automatically reset when the voltage output by the comparison output end of the comparison amplifier U1 is abnormal, so that the normal work of the current detection circuit is ensured, and the stability of the whole circuit is improved.
In one or more embodiments provided by the present invention, the working reset circuit includes a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a diode D1, and a transistor Q1, the capacitor C4 is electrically connected between the reset input terminal of the comparison amplifier U1 and the ground, the reset input terminal of the comparison amplifier U1 is electrically connected to the negative electrode of the diode D1, the resistor R6 is electrically connected between the positive electrode and the negative electrode of the diode D1, the positive electrode of the diode D1 is electrically connected to the external power supply +3V3 through the resistor R7, the positive electrode of the diode is also electrically connected to the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the capacitor C5 and the resistor R10 are connected in parallel between the base of the transistor Q1 and the ground, the resistor R9 and the resistor R8 are sequentially connected in series between the base of the transistor Q1 and the external power supply +3V3, and the common terminal of the resistor R9 and the resistor R8 is electrically connected with the comparison output terminal of the comparison amplifier U1.
Here, when the comparison output terminal of the comparison amplifier U1 outputs a low level (i.e., operates normally), the base of the transistor Q1 is at a low level, the transistor Q1 does not operate, the collector is at a high level, and the reset inverting input terminal of the comparison amplifier U1 does not receive a reset signal, i.e., the comparison amplifier U1 does not reset during normal operation; when the comparison output end of the comparison amplifier U1 outputs a high level (i.e., abnormal operation), the base of the triode Q1 is at a high level, the triode Q1 operates, the collector is at a low level, and the reset inverting input end of the comparison amplifier U1 receives a reset signal, i.e., the comparison amplifier U1 automatically resets when the comparison amplifier U1 is in abnormal operation. The diode is a BAV70 diode.
As shown in fig. 3, in one or more embodiments of the present invention, the logic control circuit includes an or gate chip U2, a resistor R2, a capacitor C2, a transistor Q2, and a transistor Q2, the comparison output terminal of the comparison amplifier U2 is electrically connected to an input terminal of the or gate chip U2 through the resistor R2, the CPU control signal is connected to another input terminal of the or gate chip U2, another input terminal of the or gate chip U2 is grounded through the resistor R2, the ground terminal of the or gate chip U2 is electrically connected to a ground, the power supply terminal of the or gate chip U2 is electrically connected to a + V3, and the capacitor C2 is electrically connected to the ground terminal 2 and the ground terminal 2, the output end of the or gate chip U2 is electrically connected with the base of the triode Q2 through the resistor R15, the R16 and the capacitor C18 are connected in parallel between the base and the emitter of the triode Q2, the emitter of the triode Q2 is grounded, the resistor R14 and the resistor R17 are sequentially connected in series between the base and the collector of the triode Q2, the collector of the triode Q2 is electrically connected with the base of the triode Q3 through the resistor R18, the common end of the resistor R14 and the resistor R17 is electrically connected with the external power supply +13.5V, the resistor R19 is electrically connected between the emitter of the triode Q3 and the external power supply +13.5V, the capacitor C9, the resistor R20 and the resistor R21 are connected in parallel between the external power supply +13.5V and the ground, the resistor R22, the resistor R23 and the resistor R23 are sequentially connected in series between the external power supply +13.5V and the collector of the triode Q23, and the common end of the resistor R22 and the resistor R23 is electrically connected with the input end of the main circuit of the switching power supply.
The logic control circuit can perform OR logic operation on the output signal of the comparison amplifier U1 and a CPU control signal and generate a corresponding logic level signal to control the working state of the main circuit of the switching power supply, so that the whole switching power supply circuit outputs stable voltage and current.
As shown in fig. 4, in one or more embodiments of the present invention, the switching power supply main circuit includes a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14, a diode D2, a diode D3, a diode D4, a MOS transistor Q4, a resistor R25, and a resistor R25, wherein a cathode of the diode D25 is electrically connected to an external power supply +13.5V, an anode of the diode D25 is electrically connected to a gate of the MOS transistor Q25 through the resistor R25, the capacitor C25 is connected in parallel to both ends of the diode D25, the resistor R25 and the capacitor C25 are connected in series between a gate and a drain of the MOS transistor Q25, the drain of the MOS transistor Q25 and an anode of the external power supply +13.5V are connected in series through the transistor C25 and the resistor R25, the positive electrode of the triode D3 is grounded through the capacitor C14, the negative electrode of the triode D3 is electrically connected with the +12VB of an external power supply, the diode D4 and the capacitor C13 are connected between the negative electrode of the triode D3 and the ground in parallel, the drain electrode of the MOS tube Q4 is electrically connected with the positive power supply input end of the comparison amplifier U1 as the positive current detection end, and the positive electrode of the triode D3 is electrically connected with the negative power supply input end of the comparison amplifier U1 as the negative current detection end.
By controlling the working state of the MOS transistor Q4 according to the logic level signal output by the logic control circuit, the MOS transistor Q4 is enabled to be switched on and output stable voltage current, or the MOS transistor Q4 is enabled to be switched off and output current-limited or not output voltage current.
The utility model discloses in, resistance R27 constitutes the filter circuit who gets rid of MOS pipe Q4 source electrode, drain electrode ripple with electric capacity C12, and resistance R28 and resistance R29 constitute the electric current measurement measuring circuit who turns into the voltage difference with the electric current volume that flows through, and diode D4 constitutes output filter circuit with electric capacity C13. The diode D4 is a chip TVS tube model SMBJ6.0CA.
Here, when the CPU control signal is at a low level, if the output current of the main circuit of the switching power supply is too large, the or gate chip U2 outputs a high level, the transistor Q2 is turned on, the transistor Q3 is turned off, and the current flows through the resistor R20 and the resistor R21, so that the MOS transistor Q4 is turned off, and the switching power supply is limited or not output; if the output current of the main circuit of the switching power supply is normal, the OR gate chip U2 outputs low level, the triode Q2 is turned off, the triode Q3 is turned on, the current flows through the grid of the Q4, and the MOS transistor Q4 is turned on, so that the switching power supply can normally work and output. When the CPU control signal is high level, no matter whether the output current of the main circuit of the switching power supply is normal or not, the MOS tube Q4 is in a turn-off state, so that the switching power supply is limited in current or not.
The utility model discloses a detectable electric current's switching power supply circuit has solved switching power supply and has had the problem of output voltage electric current excessive pressure overcurrent, and voltage electric current control precision is higher, reaches the technical requirement of this kind of current detection comparative switching power supply to but wide application in integrated circuit chip power supply actual circuit.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. A switching power supply circuit capable of detecting current is characterized in that: the switching power supply comprises a current detection circuit, a logic control circuit and a switching power supply main circuit, wherein the input end of the current detection circuit is electrically connected with the output end of the switching power supply main circuit and collects a current signal of the switching power supply main circuit, the output end of the current detection circuit is electrically connected with one signal input end of the logic control circuit, a CPU control signal is connected into the other signal input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the input control end of the switching power supply main circuit, and the switching power supply main circuit outputs a stable voltage to the outside.
2. The current detectable switching power supply circuit according to claim 1, characterized in that: the current detection circuit comprises a comparison amplifier U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2 and a capacitor C3, wherein a positive power supply input end of the comparison amplifier U1 is electrically connected with a current detection positive terminal VIN + VIN of the switching power supply main circuit through the resistor R1, a negative power supply input end of the comparison amplifier U1 is electrically connected with a current detection negative terminal VIN-of the switching power supply main circuit through the resistor R2, the capacitor C1 is electrically connected between the positive power supply input end and the negative power supply input end of the comparison amplifier U1, a comparison signal input end of the comparison amplifier U1 is grounded through the resistor R3, the resistor R4 and the resistor R5 are sequentially connected in series between a comparison voltage input end and an amplification signal output end of the comparison amplifier U1, a ground end of the comparison amplifier U1 is grounded, the comparison signal output end of the comparison amplifier U1 is electrically connected with the input end of the logic control circuit, the power supply input end of the comparison amplifier U1 is electrically connected with an external power supply, and the capacitor C2 and the capacitor C3 are connected between the power supply input end of the comparison amplifier U1 and the ground in parallel.
3. The current detectable switching power supply circuit according to claim 2, characterized in that: the current detection circuit further comprises a work reset circuit, the output end of the work reset circuit is electrically connected with the reset reverse input end of the comparison amplifier U1, the input end of the work reset circuit is electrically connected with an external power supply, and the reference judgment condition control end of the work reset circuit is electrically connected with the comparison output end of the comparison amplifier U1.
4. The current detectable switching power supply circuit according to claim 3, characterized in that: the work reset circuit comprises a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C4, a capacitor C5, a diode D1 and a triode Q1, the capacitor C4 is electrically connected between the reset input end of the comparison amplifier U1 and the ground, the reset input end of the comparison amplifier U1 is electrically connected with the cathode of the diode D1, the resistor R6 is electrically connected between the positive pole and the negative pole of the diode D1, the positive pole of the diode D1 is electrically connected with an external power supply through the resistor R7, the anode of the diode is also electrically connected with the collector of the transistor Q1, the emitter of the transistor Q1 is grounded, the capacitor C5 and the resistor R10 are connected in parallel between the base of the transistor Q1 and the ground, the resistor R9 and the resistor R8 are connected in series between the base of the triode Q1 and an external power supply in sequence, and the common terminal of the resistor R9 and the resistor R8 is electrically connected with the comparison output terminal of the comparison amplifier U1.
5. A current detectable switching power supply circuit according to any of claims 2-4, characterized in that: the logic control circuit comprises an OR gate chip U2, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9, a triode Q2 and a triode Q3, a comparison output end of the comparison amplifier U1 is electrically connected with one input end of the OR gate chip U2 through the resistor R11, a CPU control signal is connected to the other input end of the OR gate chip U2, the other input end of the OR gate chip U2 is grounded through the resistor R13, a ground end of the OR gate chip U2 is grounded, a power supply input end of the OR gate chip U2 is electrically connected with an external power supply, a power supply input end of the OR gate U2 is electrically connected with a ground, and a resistor C2 or a triode Q2 is electrically connected with a base of the resistor C2 or a resistor R2, the R16 and the capacitor C18 are connected in parallel between the base electrode and the emitter electrode of the triode Q2, the emitter of the triode Q2 is grounded, the resistor R14 and the resistor R17 are connected in series between the base and the collector of the triode Q2 in sequence, the collector of the transistor Q2 is electrically connected with the base of the transistor Q3 through the resistor R18, the common end of the resistor R14 and the resistor R17 is electrically connected with an external power supply, the resistor R19 is electrically connected between the emitter of the triode Q3 and the external power supply, the capacitor C9, the resistor R20 and the resistor R21 are connected between the external power supply and the ground in parallel, the resistor R22, the resistor R23 and the resistor R24 are sequentially connected between the external power supply and the ground in series, the common terminal of the resistor R22 and the resistor R23 is electrically connected with the collector of the triode Q3, and the common end of the resistor R22 and the resistor R23 is electrically connected with the input end of the main circuit of the switching power supply.
6. The current detectable switching power supply circuit according to claim 5, characterized in that: the switching power supply main circuit comprises a capacitor C10, a diode D10, a MOS tube Q10, a resistor R10 and a resistor R10, wherein the cathode of the diode D10 is electrically connected with an external power supply, the anode of the diode D10 is electrically connected with the gate of the MOS tube Q10 through the resistor R10, the capacitor C10 is connected in parallel with two ends of the diode D10, the resistor R10 and the capacitor C10 are sequentially connected in series between the gate and the drain of the MOS tube Q10, the drain of the MOS tube Q10 is connected with the external power supply in series with the capacitor C10 and the resistor R10, the drain of the transistor Q10 is connected in parallel with the anode of the triode D10 through the capacitor C10, the anode of the MOS tube Q10 is electrically connected in series with the anode of the triode D10, and the MOS tube D10, the anode of the triode D10 is electrically connected with the external power supply in series, and the anode of, the diode D4 and the capacitor C13 are connected in parallel between the negative electrode of the triode D3 and the ground, the drain electrode of the MOS tube Q4 is electrically connected with the positive power supply input end of the current detection circuit as the positive current detection terminal VIN +, and the positive electrode of the triode D3 is electrically connected with the negative power supply input end of the current detection circuit as the negative current detection terminal VIN-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155338.9U CN210640811U (en) | 2019-07-23 | 2019-07-23 | A switching power supply circuit that can detect current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155338.9U CN210640811U (en) | 2019-07-23 | 2019-07-23 | A switching power supply circuit that can detect current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210640811U true CN210640811U (en) | 2020-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921155338.9U Withdrawn - After Issue CN210640811U (en) | 2019-07-23 | 2019-07-23 | A switching power supply circuit that can detect current |
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| Country | Link |
|---|---|
| CN (1) | CN210640811U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417260A (en) * | 2019-07-23 | 2019-11-05 | 武汉洲际电讯科技股份有限公司 | A switching power supply circuit capable of detecting current |
| CN119125855A (en) * | 2024-11-14 | 2024-12-13 | 北京迪赛奇正科技有限公司 | A self-detection method and system for current balancing circuit |
-
2019
- 2019-07-23 CN CN201921155338.9U patent/CN210640811U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417260A (en) * | 2019-07-23 | 2019-11-05 | 武汉洲际电讯科技股份有限公司 | A switching power supply circuit capable of detecting current |
| CN110417260B (en) * | 2019-07-23 | 2025-01-24 | 武汉洲际电讯科技股份有限公司 | A switching power supply circuit capable of detecting current |
| CN119125855A (en) * | 2024-11-14 | 2024-12-13 | 北京迪赛奇正科技有限公司 | A self-detection method and system for current balancing circuit |
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Granted publication date: 20200529 Effective date of abandoning: 20250124 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200529 Effective date of abandoning: 20250124 |