CN218335746U - Current-limiting protection circuit and switching power supply - Google Patents
Current-limiting protection circuit and switching power supply Download PDFInfo
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- CN218335746U CN218335746U CN202222221214.4U CN202222221214U CN218335746U CN 218335746 U CN218335746 U CN 218335746U CN 202222221214 U CN202222221214 U CN 202222221214U CN 218335746 U CN218335746 U CN 218335746U
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Abstract
The utility model relates to a current-limiting protection circuit and a switch power supply, wherein the current-limiting protection circuit comprises a self-adaptive current-limiting point adjusting circuit and a clamping diode D1; the first input end of the self-adaptive current-limiting point adjusting circuit is used for accessing the input voltage of the switching power supply, the second input end of the self-adaptive current-limiting point adjusting circuit is used for accessing the output voltage of the switching power supply, and the output end of the self-adaptive current-limiting point adjusting circuit is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for being connected with the output end of the error amplifying circuit; the self-adaptive current-limiting point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the cathode of the clamping diode D1; the clamping diode D1 is used for clamping the Comp voltage to the first voltage signal to limit the output current of the switching power supply when the Comp voltage output by the error amplifying circuit is greater than the first voltage signal. The utility model discloses can realize the self-adaptation regulation of current-limiting point, be particularly useful for wide voltage high-power, full load current along with the switching power supply of input-output voltage transform.
Description
Technical Field
The utility model relates to a switching power supply technical field especially relates to a current-limiting protection circuit and switching power supply.
Background
At present, more and more wide-voltage high-power switching power supplies are widely used in military and civil electronic equipment, and for the wide-voltage high-power switching power supplies, the wide-voltage high-power switching power supplies have the characteristics of wide input and output ranges, wide full-load power coverage range, wide output full-load current point coverage range and the like, and usually, current detection resistors are required to be connected in series at an input end and an output end at the same time, and input and output currents are sampled through a current sampling chip, so that the current-limiting protection of the switching power supplies is completed.
The conventional current-limiting protection circuit for the wide-voltage high-power switching power supply needs to additionally increase a sampling resistor and a current sampling chip on a power loop, so that the self loss of the switching power supply is increased, and the cost of the switching power supply is increased.
In the conventional current-limiting protection circuit, when the resistance values of the current-limiting resistors in the current-limiting protection circuit are all fixed parameters, the current-limiting points are fixed, so that the switching power supply cannot realize a multi-gear current output function and cannot meet various rear-end variable load requirements.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model is to provide a current-limiting protection circuit and switching power supply, solve loss and the cost problem that present wide voltage high power switching power supply adopted conventional current-limiting protection to cause through self-adaptation fit current-limiting point.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, a current-limiting protection circuit is provided, which is applied to a switching power supply, the switching power supply includes a power converter and a control circuit that are connected in sequence, the control circuit includes an error amplification circuit and a PWM control circuit that are connected in sequence, and the protection circuit includes: a self-adaptive current-limiting point adjusting circuit and a clamping diode D1; the first input end of the self-adaptive current-limiting point regulating circuit is used for accessing the input voltage of the power converter, the second input end of the self-adaptive current-limiting point regulating circuit is used for accessing the output voltage of the power converter, and the output end of the self-adaptive current-limiting point regulating circuit is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for being connected with the output end of the error amplifying circuit;
the self-adaptive current-limiting point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the cathode of the clamping diode D1; the clamping diode D1 is used for clamping the Comp voltage to the first voltage signal to limit the output current of the switching power supply when the Comp voltage output by the error amplifying circuit is greater than the first voltage signal.
Preferably, the adaptive current limit point adjusting circuit includes: the input voltage sampling circuit, the output voltage sampling circuit and the digital controller U3;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the input voltage of the power converter, and the output end of the input voltage sampling circuit is connected with the first input end of the digital controller U3;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the output voltage of the power converter, and the output end of the output voltage sampling circuit is connected with the second input end of the digital controller U3;
the output end of the digital controller U3 is used as the output end of the self-adaptive current-limiting point adjusting circuit and is connected with the cathode of the clamping diode D1.
Preferably, the adaptive current-limiting point adjusting circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and includes: the input voltage sampling circuit collects input voltage of the power converter and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects output voltage of the power converter and outputs the output voltage to the digital controller U3, and the digital controller U3 generates corresponding first voltage signals according to preset self-adaptive current limiting point functions on the input voltage and the output voltage.
Preferably, the adaptive current-limiting point adjusting circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and includes: the input voltage sampling circuit collects the input voltage of the power converter and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects the output voltage of the power converter and outputs the output voltage to the digital controller U3, and the digital controller U3 searches out a corresponding first voltage signal in a preset self-adaptive current-limiting point lookup table according to the input voltage and the output voltage.
Preferably, the input voltage sampling circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is used as the input end of the input voltage sampling circuit, the other end of the resistor R1 is connected with one end of the resistor R2 and then used as the output end of the input voltage sampling circuit, and the other end of the resistor R2 is connected to the power ground of the switching power supply.
Preferably, the output voltage sampling circuit includes a resistor R3 and a resistor R4, one end of the resistor R3 is used as the input end of the output voltage sampling circuit, the other end of the resistor R3 is connected with one end of the resistor R4 and then used as the output end of the output voltage sampling circuit, and the other end of the resistor R3 is connected to the power ground of the switching power supply.
In a second aspect, a current-limiting protection circuit is provided, which is applied to a switching power supply, and includes: the self-adaptive current-limiting point adjusting circuit comprises a self-adaptive current-limiting point adjusting circuit, a clamping diode D1 and an error amplifying circuit;
the self-adaptive current-limiting point adjusting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a digital controller U3;
one end of the resistor R1 is used as a first input end of the self-adaptive current-limiting point adjusting circuit and is used for accessing the input voltage of the power converter, and the other end of the resistor R1 is connected with one end of the resistor R2 and a first input end of the digital controller U3; one end of the resistor R3 is used as a second input end of the self-adaptive current-limiting point adjusting circuit and is used for being connected with the output voltage of the power converter, and the other end of the resistor R3 is connected with one end of the resistor R4 and a second input end of the digital controller U3; the other end of the resistor R2 and the other end of the resistor R4 are connected with the power ground of the switching power supply; the output end of the digital controller U3 is used as the output end of the self-adaptive current-limiting point adjusting circuit and is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for connection with the output terminal of the error amplifying circuit.
In a third aspect, a switching power supply is provided, which includes a power converter, a control circuit and the protection circuit, where the control circuit includes an error amplification circuit and a PWM control circuit connected in sequence; the input end of the power converter is connected with the first input end of the self-adaptive current-limiting point regulating circuit and the output end of the PWM control circuit, and the output end of the power converter is connected with the second input end of the self-adaptive current-limiting point regulating circuit and the first input end of the error amplifying circuit; the anode of the clamping diode D1 is connected with the output end of the error amplifying circuit; the first input end of the self-adaptive current-limiting point adjusting circuit samples the input voltage of the power converter, the second input end samples the output voltage of the power converter, a first voltage signal is generated according to the input voltage and the output voltage, and when the Comp voltage output by the error amplifying circuit is larger than the first voltage signal, the clamping diode D1 clamps the Comp voltage into the first voltage signal, so that the PWM control circuit is controlled to output a PWM signal to the power converter according to the first voltage signal.
Preferably, the error amplifying circuit comprises an error amplifier U1 and a compensation network; the forward input end of the error amplifier U1 is used as the first input end of the error amplifying circuit and used for accessing a reference voltage, the reverse input end of the error amplifier U1 is used as the second input end of the error amplifying circuit after being connected with one end of a compensation network and used for accessing the feedback voltage of the power converter, and the output end of the error amplifier U1 is used as the output end of the error amplifying circuit after being connected with the other end of the compensation network.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses a self-adaptation current-limiting point regulating circuit is according to the switching power supply input voltage and the output voltage who gathers, the first voltage signal that the output self-adaptation current-limiting point function corresponds or adopt the table look-up method to look for the first voltage signal that the output corresponds, and through clamp diode D1 clamp error amplifier circuit output Comp voltage, thereby realize the high-power switching power supply current-limiting protect function of wide pressure, solve the problem of the partial operating mode overpower that single current-limiting point caused and improve switching power supply efficiency.
Drawings
Fig. 1 is a block diagram of a switching power supply according to the present invention;
fig. 2 is a schematic diagram of the current limiting protection circuit of the present invention;
fig. 3 is a schematic diagram of the adaptive current-limiting point adjusting circuit of the present invention.
Detailed Description
The drawings of the present invention are for illustration purposes only and are not to be construed as limiting the invention. For a better understanding of the following embodiments, some elements of the drawings may be omitted and may not represent actual circuit schematics; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention conception of the application is as follows: the method comprises the steps that a digital controller is utilized to sample input and output voltage of a switching power supply, corresponding current limiting points are generated according to a preset self-adaptive current limiting point function or corresponding current limiting points are searched from a self-adaptive current limiting point lookup table by adopting a lookup table method, the Comp voltage output by an error amplifier U1 is increased along with the increase of the load of the switching power supply, and when the Comp voltage output by the error amplifier U1 reaches a first voltage signal generated by a digital controller U3, the output of the error amplifier U1 is clamped to the first voltage signal, so that the purpose of self-adaptive current limiting is achieved.
As shown in fig. 1 and fig. 2, fig. 1 is a block diagram of a switching power supply according to this embodiment, fig. 2 is a schematic diagram of a current-limiting protection circuit according to this embodiment, in this embodiment, a current-limiting protection circuit is provided and applied to a switching power supply, the switching power supply includes a power converter 101 and a control circuit 102 that are sequentially connected, the control circuit 102 includes an error amplification circuit and a PWM control circuit 102 that are sequentially connected, and the protection circuit 103 includes: a self-adaptive current-limiting point adjusting circuit and a clamping diode D1; the first input end of the self-adaptive current-limiting point regulating circuit is used for accessing the input voltage of the power converter 101, the second input end of the self-adaptive current-limiting point regulating circuit is used for accessing the output voltage of the power converter 101, and the output end of the self-adaptive current-limiting point regulating circuit is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for being connected with the output end of the error amplifying circuit;
the self-adaptive current-limiting point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the cathode of the clamping diode D1;
the clamping diode D1 is used for clamping the Comp voltage to the first voltage signal to limit the output current of the switching power supply when the Comp voltage output by the error amplifying circuit is greater than the first voltage signal.
Specifically, the control circuit 102 includes an error amplifying circuit and a PWM control circuit connected in sequence; the input end of the power converter 101 is connected with the first input end of the adaptive current-limiting point regulating circuit and the output end of the PWM control circuit, and the output end of the power converter 101 is connected with the second input end of the adaptive current-limiting point regulating circuit and the first input end of the error amplifying circuit; the anode of the clamping diode D1 is connected with the output end of the error amplifying circuit; a first input end of the adaptive current-limiting point regulating circuit samples an input voltage of the power converter 101, a second input end samples an output voltage of the power converter 101, and generates a first voltage signal according to the input voltage and the output voltage, when the Comp voltage output by the error amplification circuit is greater than the first voltage signal, the clamping diode D1 clamps the Comp voltage to the first voltage signal, and then controls the PWM control circuit to output a PWM signal to the power converter 101 according to the first voltage signal, and the power converter 101 controls the duty ratio thereof according to the PWM signal; the error amplifying circuit comprises an error amplifier U1 and a compensation network; the positive input end of the error amplifier U1 is used as the first input end of the error amplifying circuit and is used for accessing a reference voltage, the negative input end of the error amplifier U1 is used as the second input end of the error amplifying circuit and is used for accessing a feedback voltage after being connected with one end of the compensation network, and the output end of the error amplifier U1 is used as the output end of the error amplifying circuit after being connected with the other end of the compensation network. Wherein, U1 in fig. 2 is an error amplifier, a positive input terminal of the error amplifier U1 is connected to the reference voltage Vref, a negative input terminal of the error amplifier U1 is connected to an output terminal of the power converter 101 and one end of the compensation network at the same time, and is connected to the feedback input FB, and an output terminal of the error amplifier is connected to the other end of the compensation network and the anode of the clamping diode D1 at the same time. U2 is the self-adaptation current-limiting point regulator circuit, and input voltage Vin is connected to the first input end of self-adaptation current-limiting point regulator circuit, and output voltage Vo is connected to the second input end of self-adaptation current-limiting point regulator circuit, and the output of self-adaptation current-limiting point regulator circuit produces first voltage signal, and first voltage signal connects the negative pole of clamping diode D1, and when the Comp voltage that error amplifier U1 output is greater than first voltage signal, error amplifier output Comp voltage is clamped to first voltage signal through clamping diode D1.
Referring to fig. 3, fig. 3 is a schematic diagram of an adaptive current-limiting point adjusting circuit, as an embodiment of the adaptive current-limiting point adjusting circuit, the adaptive current-limiting point adjusting circuit includes: the input voltage sampling circuit, the output voltage sampling circuit and the digital controller U3;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the input voltage of the power converter 101, and the output end of the input voltage sampling circuit is connected with the first input end PA0 of the digital controller U3;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the output voltage of the power converter 101, and the output end of the output voltage sampling circuit is connected with the second input end PA1 of the digital controller U3;
an output end PA2 of the digital controller U3 is used as an output end of the self-adaptive current-limiting point adjusting circuit and is connected with the cathode of the clamping diode D1.
Specifically, the input voltage sampling circuit includes resistance R1 and resistance R2, and the one end of resistance R1 is regarded as input voltage sampling circuit's input, and the back is connected with the one end of resistance R2 to the other end of resistance R1, is regarded as input voltage sampling circuit's output, and the other end of resistance R2 connects switching power supply's power ground.
Output voltage sampling circuit includes resistance R3 and resistance R4, and the one end of resistance R3 is regarded as output voltage sampling circuit's input, the back is connected with resistance R4's one end to resistance R3's the other end, as output voltage sampling circuit's output, resistance R3's the other end connect switching power supply's power ground.
Specifically, the adaptive current-limiting point adjusting circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and may include: the input voltage sampling circuit collects the input voltage of the power converter 101 and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects the output voltage of the power converter 101 and outputs the output voltage to the digital controller U3, and the digital controller U3 searches out a corresponding first voltage signal in a preset self-adaptive current-limiting point lookup table according to the input voltage and the output voltage; and may also include: the input voltage sampling circuit collects input voltage of the power converter 101 and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects output voltage of the power converter 101 and outputs the output voltage to the digital controller U3, and the digital controller U3 generates corresponding first voltage signals according to preset self-adaptive current limiting point functions of the input voltage and the output voltage.
Specifically, the preset adaptive current-limiting point function is generated in advance according to the relationship fit of a plurality of input voltages, output voltages and Comp voltage; the self-adaptive current limiting point lookup table comprises a plurality of current limiting points (first voltage signals) corresponding to different input voltages and output voltages; therefore, the digital controller U1 can output corresponding current-limiting points according to different input voltages and output voltages, so that the current-limiting protection function of the wide-voltage high-power switching power supply is realized, the problem of partial working condition overpower caused by a single current-limiting point is solved, and the efficiency of the switching power supply is improved.
It should be noted that the above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as a limitation of the present invention, and it should be recognized that the present invention can be applied to other broader scope. According to the above-mentioned contents of the present invention, by using the common technical knowledge and conventional means in the field, the present invention can also make other modifications, replacements or changes in various forms without departing from the basic technical idea of the present invention, and these modifications, replacements or changes all fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a current-limiting protection circuit, is applied to switching power supply, switching power supply is including the power converter and the control circuit that connect gradually, control circuit is including the error amplification circuit and the PWM control circuit that connect gradually, its characterized in that, protection circuit includes: a self-adaptive current-limiting point adjusting circuit and a clamping diode D1; the first input end of the self-adaptive current-limiting point regulating circuit is used for accessing the input voltage of the power converter, the second input end of the self-adaptive current-limiting point regulating circuit is used for accessing the output voltage of the power converter, and the output end of the self-adaptive current-limiting point regulating circuit is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for being connected with the output end of the error amplifying circuit;
the self-adaptive current-limiting point adjusting circuit is used for generating a corresponding first voltage signal according to the input voltage and the output voltage and outputting the first voltage signal to the cathode of the clamping diode D1;
the clamping diode D1 is used for clamping the Comp voltage to the first voltage signal to limit the output current of the switching power supply when the Comp voltage output by the error amplifying circuit is greater than the first voltage signal.
2. The current-limiting protection circuit of claim 1, wherein the adaptive current-limiting point adjustment circuit comprises: the digital controller comprises an input voltage sampling circuit, an output voltage sampling circuit and a digital controller U3;
the input end of the input voltage sampling circuit is used as the first input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the input voltage of the power converter, and the output end of the input voltage sampling circuit is connected with the first input end of the digital controller U3;
the input end of the output voltage sampling circuit is used as the second input end of the self-adaptive current-limiting point regulating circuit and is used for accessing the output voltage of the power converter, and the output end of the output voltage sampling circuit is connected with the second input end of the digital controller U3;
the output end of the digital controller U3 is used as the output end of the self-adaptive current-limiting point adjusting circuit and is connected with the cathode of the clamping diode D1.
3. The current-limiting protection circuit of claim 2, wherein the adaptive current-limiting point adjustment circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and comprises: the input voltage sampling circuit collects the input voltage of the power converter and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects the output voltage of the power converter and outputs the output voltage to the digital controller U3, and the digital controller U3 generates a corresponding first voltage signal by the input voltage and the output voltage according to a preset self-adaptive current limiting point function.
4. The current-limiting protection circuit of claim 2, wherein the adaptive current-limiting point adjustment circuit is configured to generate a corresponding first voltage signal according to an input voltage and an output voltage, and comprises: the input voltage sampling circuit collects the input voltage of the power converter and outputs the input voltage to the digital controller U3, the output voltage sampling circuit collects the output voltage of the power converter and outputs the output voltage to the digital controller U3, and the digital controller U3 searches out a corresponding first voltage signal in a preset self-adaptive current-limiting point lookup table according to the input voltage and the output voltage.
5. The current-limiting protection circuit according to any one of claims 2-4, wherein the input voltage sampling circuit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is used as the input end of the input voltage sampling circuit, the other end of the resistor R1 is connected with one end of the resistor R2 and then used as the output end of the input voltage sampling circuit, and the other end of the resistor R2 is connected with a power ground of the switching power supply.
6. The current-limiting protection circuit according to any one of claims 2-4, wherein the output voltage sampling circuit comprises a resistor R3 and a resistor R4, one end of the resistor R3 is used as the input end of the output voltage sampling circuit, after the other end of the resistor R3 is connected with one end of the resistor R4, the other end of the resistor R3 is used as the output end of the output voltage sampling circuit, and the other end of the resistor R3 is connected with the power ground of the switching power supply.
7. The utility model provides a current-limiting protection circuit, is applied to switching power supply, switching power supply is including the power converter and the control circuit who connect gradually, control circuit is including the error amplification circuit and the PWM control circuit who connect gradually, its characterized in that, protection circuit includes: a self-adaptive current-limiting point adjusting circuit and a clamping diode D1;
the self-adaptive current-limiting point adjusting circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a digital controller U3;
one end of the resistor R1 is used as a first input end of the self-adaptive current-limiting point adjusting circuit and is used for accessing the input voltage of the power converter, and the other end of the resistor R1 is connected with one end of the resistor R2 and a first input end of the digital controller U3; one end of the resistor R3 is used as a second input end of the self-adaptive current-limiting point adjusting circuit and is used for being connected with the output voltage of the power converter, and the other end of the resistor R3 is connected with one end of the resistor R4 and a second input end of the digital controller U3; the other end of the resistor R2 and the other end of the resistor R4 are connected with the power ground of the switching power supply; the output end of the digital controller U3 is used as the output end of the self-adaptive current-limiting point adjusting circuit and is connected with the cathode of the clamping diode D1; the anode of the clamping diode D1 is used for connection with the output terminal of the error amplifying circuit.
8. A switching power supply comprising a power converter, a control circuit and a protection circuit according to any one of claims 1 to 7, wherein the control circuit comprises an error amplification circuit and a PWM control circuit connected in series; the input end of the power converter is connected with the first input end of the self-adaptive current-limiting point regulating circuit and the output end of the PWM control circuit, and the output end of the power converter is connected with the second input end of the self-adaptive current-limiting point regulating circuit and the first input end of the error amplifying circuit; the anode of the clamping diode D1 is connected with the output end of the error amplifying circuit; the first input end of the self-adaptive current-limiting point adjusting circuit samples the input voltage of the power converter, the second input end samples the output voltage of the power converter, a first voltage signal is generated according to the input voltage and the output voltage, and when the Comp voltage output by the error amplifying circuit is larger than the first voltage signal, the clamping diode D1 clamps the Comp voltage into the first voltage signal, so that the PWM control circuit is controlled to output a PWM signal to the power converter according to the first voltage signal.
9. The switching power supply according to claim 8, wherein the error amplifying circuit comprises an error amplifier U1, a compensation network; the forward input end of the error amplifier U1 is used as a first input end of the error amplifying circuit and is used for accessing a reference voltage, the reverse input end of the error amplifier U1 is used as a second input end of the error amplifying circuit after being connected with one end of the compensating network and is used for accessing the feedback voltage output by the power converter, and the output end of the error amplifier U1 is used as the output end of the error amplifying circuit after being connected with the other end of the compensating network.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222221214.4U CN218335746U (en) | 2022-08-23 | 2022-08-23 | Current-limiting protection circuit and switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222221214.4U CN218335746U (en) | 2022-08-23 | 2022-08-23 | Current-limiting protection circuit and switching power supply |
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| CN218335746U true CN218335746U (en) | 2023-01-17 |
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| CN202222221214.4U Active CN218335746U (en) | 2022-08-23 | 2022-08-23 | Current-limiting protection circuit and switching power supply |
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