Circuit of single-power-supply input and output double-voltage-stabilized power supply

Abstract

The utility model relates to the technical field of switching power supplies, and discloses a circuit of a single-power-supply input / output double-voltage-stabilized power supply, which comprises a main voltage reduction conversion circuit; a positive voltage stabilizing circuit; a negative voltage stabilizing circuit; a protection circuit; the positive voltage stabilizing circuit is a DCDC step-down circuit, and the negative voltage stabilizing circuit is an LDO linear voltage stabilizing circuit; according to the utility model, a DCDC step-down chip + LDO architecture mode is adopted, the ripple of the power supply is stabilized within positive and negative 20mV, and the cost of the switching power supply is relatively reduced; the circuit adopts patch elements, the installation height is low, the size is small, the structure is simple, integration in a designed circuit is facilitated, and the requirement for the installation environment is lowered; the positive output power and the negative output power can reach about 12W, the total output power does not exceed 24W, the size of the switching power supply is reduced, the ripple and the cost of the switching power supply are reduced, and the output power of the switching power supply is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switching power supply, concretely is a single power input output double voltage stabilizing power supply's circuit. BACKGROUND

[0002] Switching power supply, also known as switching power supply, switching converter, is a kind of high-frequency power conversion device, and the working principle of switching power supply is to use modern power electronics technology, and the electric energy conversion is carried out through high-frequency switching devices (such as transistor, MOSFET, etc.). It controls the time ratio of switch tube opening and shutting, switches input voltage into high-frequency pulse signal, and the high-frequency pulse signal is processed through transformer or inductor conversion and filter circuit, and finally obtains stable DC output voltage.

[0003] Through the search, the patent with the application number CN201620566921.9 discloses a bipolar switching voltage stabilizing power supply based on triode current expansion circuit, which is characterized by mainly comprising control chip U, transformer T, reference voltage circuit, triode VT1, diode D1, polarity capacitor C7, triode current expansion circuit connected with the OUT pin of control chip U, micro-processing circuit connected between reference voltage circuit and the original side inductance coil L1 of transformer T, and switch control circuit connected with triode current expansion circuit and the I pin of control chip U respectively. The utility model can automatically adjust the input voltage, effectively ensures that the utility model can output stable voltage, thereby improving the accuracy of various function detection of battery protection circuit board of the utility model.

[0004] When the current market circuit design supplies positive and negative 12V for operational amplifier, generally, positive and negative double power output switching power supply is purchased, but often such power supply is very expensive. And the smaller the ripple is required, the more expensive the price is, and the price of positive and negative double power output switching power supply is several times of DCDC step-down chip+LDO circuit. And the switching power supply is large in size, and the larger the output power is, the larger the size is, and there are requirements for installation environment, so we need to propose a single power input output double voltage stabilizing power supply circuit, which is low in cost and small in installation size. UTILITY MODEL CONTENTS

[0005] The utility model discloses a single power input output dual voltage stabilizing power's circuit, adopt DCDC voltage reducing chip + LDO framework's mode, the ripple of power is stabilized in positive and negative 20mV, relatively reduced the cost of switching power supply, the circuit adopts the paster component, and the height of installation is low, and the small size is simple structure, and it is convenient to integrate in the design circuit, reduced the requirement to the installation environment, and the positive and negative output power can reach 12W or so, and the total output power is not more than 24W, realized the reduction switching power supply volume, reduced the ripple of switching power supply, cost, improved the output power of switching power supply, to solve the problem of above -mentioned background art.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a single power input output dual voltage stabilizing power's circuit, including:

[0007] Main voltage reducing conversion circuit for reducing and stabilizing input voltage to required output voltage;

[0008] Positive voltage stabilizing circuit for providing adjustable positive voltage output;

[0009] Negative voltage stabilizing circuit for providing adjustable negative voltage output;

[0010] Protection circuit for preventing current backflow in circuit;

[0011] The positive voltage stabilizing circuit, the negative voltage stabilizing circuit and the protection circuit are electrically connected with the main voltage reducing conversion circuit, the positive voltage stabilizing circuit and the negative voltage stabilizing circuit are arranged in parallel and grounded, the positive voltage stabilizing circuit is a DCDC voltage reducing circuit, and the negative voltage stabilizing circuit is an LDO linear voltage stabilizing circuit.

[0012] Preferably, the main voltage reducing conversion circuit includes a voltage reducing stabilizing chip U55 and an inductor L1, the pin 2 of the voltage reducing stabilizing chip U55 is connected with a 36V input voltage and is connected with a capacitor C223 and a capacitor C341 arranged in parallel, a capacitor C76 is connected between the pin 1 and the pin 8 of the voltage reducing stabilizing chip U55, and the pin 1 of the inductor L1 is connected to the pin 8 of the voltage reducing stabilizing chip U55.

[0013] Preferably, a resistor R503 is connected to the pin 4 of the voltage reducing stabilizing chip U55, a capacitor C337, a resistor R502 and a capacitor C338 connected in series are respectively connected to the pin 5 of the voltage reducing stabilizing chip U55, a resistor R62 and a resistor R500 are respectively connected to the pin 6 of the voltage reducing stabilizing chip U55, and one end of the resistor R503, the capacitor C337, the capacitor C338 and the resistor R500 is connected to a -15V power output end.

[0014] Preferably, the protection circuit comprises a diode Ln11 connected between the 7th pin and the 8th pin of the voltage reduction stabilizing chip U55, a diode Ln3 connected to the 4th pin of the inductor L1, one end of the diode Ln11 is also connected to the -15V power output end, the 2nd pin of the inductor L1 is connected with the capacitor C235, the capacitor C238 and the capacitor C205 which are arranged in parallel and connected to the -15V power output end, one end of the diode Ln3 is connected to the +15V power output end and connected with the capacitor C153, the capacitor C203 and the capacitor C204 which are arranged in parallel.

[0015] Preferably, the positive voltage stabilizing circuit comprises a linear voltage stabilizing chip U14, the 3rd pin of the linear voltage stabilizing chip U14 is connected to the +15V power output end, the 2nd pin of the linear voltage stabilizing chip U14 outputs +12V voltage, the capacitor C152 and the capacitor C221 are connected between the 1st pin and the 3rd pin of the linear voltage stabilizing chip U14, the resistor R60 and the resistor R61 are respectively connected to the 1st pin of the linear voltage stabilizing chip U14, and one end of the resistor R60 is connected to the 2nd pin of the linear voltage stabilizing chip U14.

[0016] Preferably, the negative voltage stabilizing circuit comprises a linear voltage stabilizing chip U59, the 2nd pin of the linear voltage stabilizing chip U59 is connected to the -15V power output end, the 3rd pin of the linear voltage stabilizing chip U59 outputs -12V voltage, the capacitor C334 and the capacitor C335 are connected between the 1st pin and the 2nd pin of the linear voltage stabilizing chip U59, the resistor R88 and the resistor R501 are respectively connected to the 1st pin of the linear voltage stabilizing chip U59, and one end of the resistor R501 is connected to the 3rd pin of the linear voltage stabilizing chip U59.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The utility model adopts the mode of DCDC voltage reduction chip + LDO architecture, and the ripple of the power supply is stabilized within 20mV, and the cost of the switching power supply is relatively reduced, the circuit adopts the SMD component, the height of installation is low, the volume is small, the structure is simple, is convenient for integrated in the design circuit, and the requirement to the installation environment is reduced, the positive and negative output power can reach about 12W, the total output power is not more than 24W, the volume of the switching power supply is reduced, the ripple and the cost of the switching power supply are reduced, and the output power of the switching power supply is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the circuit diagram of the utility model. CONCRETE IMPLEMENTATION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of the present application.

[0021] Please refer to Figure 1 The present application provides a technical solution: a circuit of a single power input and output dual voltage power supply, comprising:

[0022] a main voltage reduction conversion circuit for reducing and stabilizing an input voltage to a required output voltage;

[0023] The main voltage reduction conversion circuit comprises a voltage reduction and stabilization chip U55 and an inductor L1, the 2-pin of the voltage reduction and stabilization chip U55 is connected to a 36V input voltage and is connected with a capacitor C223 and a capacitor C341 arranged in parallel, the 1-pin of the voltage reduction and stabilization chip U55 is connected with the 8-pin of the voltage reduction and stabilization chip U55 through a capacitor C76, and the 1-pin of the inductor L1 is connected to the 8-pin of the voltage reduction and stabilization chip U55.

[0024] The 4-pin of the voltage reduction and stabilization chip U55 is connected with a resistor R503, the 5-pin of the voltage reduction and stabilization chip U55 is respectively connected with a capacitor C337, a resistor R502 and a capacitor C338 connected in series, and the 6-pin of the voltage reduction and stabilization chip U55 is respectively connected with a resistor R62 and a resistor R500, and one end of the resistor R503, the capacitor C337, the capacitor C338 and the resistor R500 is connected to a -15V power output end.

[0025] The voltage reduction and stabilization chip U55 is used for reducing and stabilizing the 36V input voltage to the required ±15V output voltage, the capacitor C76 is a filter capacitor for suppressing high-frequency noise, the capacitor C223 is an input filter capacitor and helps to stabilize the input voltage, the capacitor C338 is used to enhance the stability of the system, especially under high-frequency working conditions, the inductor L1 is used to store energy and provide smooth output current, and reduce output ripple, the resistor R502 is a feedback resistor for setting a stable range, and the resistor R503 is used in cooperation with the resistor R502 to form a voltage divider to ensure the stability of the output voltage of the voltage stabilizer.

[0026] a positive voltage stabilization circuit for providing an adjustable positive voltage output;

[0027] The positive voltage stabilizing circuit comprises a linear voltage stabilizing chip U14, the 3-pin of the linear voltage stabilizing chip U14 is connected to a +15V power output terminal, the 2-pin of the linear voltage stabilizing chip U14 outputs a +12V voltage, the 1-pin of the linear voltage stabilizing chip U14 is connected with a capacitor C152 and a capacitor C221, the 1-pin of the linear voltage stabilizing chip U14 is further connected with a resistor R60 and a resistor R61 respectively, one end of the resistor R60 is connected to the 2-pin of the linear voltage stabilizing chip U14, and one end of the resistor R60 and one end of the resistor R61 are connected with a capacitor C227, a capacitor C226 and a capacitor C230 arranged in parallel.

[0028] The one end of the capacitor C153, the capacitor C203, the capacitor C204, the capacitor C152, the capacitor C221, the resistor R61, the capacitor C227, the capacitor C226 and the capacitor C230 is grounded.

[0029] The linear voltage stabilizing chip U14 is an LM317G, which is an adjustable linear voltage stabilizer, used for providing a +12V output voltage, the resistor R60 and the resistor R61 are both voltage dividing resistors, the resistor R60 is used for setting the output voltage of the linear voltage stabilizing chip U14, and the resistor R61 forms a voltage divider together with the resistor R60 to adjust the output voltage.

[0030] The capacitor C152 is used for stabilizing the input voltage of the LM317G, the capacitor C221 is used for output decoupling to reduce the output ripple, the capacitor C203 is an output capacitor, used for filtering to prevent voltage fluctuation caused by load mutation, and the capacitor C204 is a large-capacity output capacitor, used for ensuring the smoothness and stability of the output voltage.

[0031] A negative voltage stabilizing circuit for providing an adjustable negative voltage output;

[0032] The negative voltage stabilizing circuit comprises a linear voltage stabilizing chip U59, the 2-pin of the linear voltage stabilizing chip U59 is connected to a -15V power output terminal, the 3-pin of the linear voltage stabilizing chip U59 outputs a -12V voltage, the 1-pin of the linear voltage stabilizing chip U59 is connected with a capacitor C334 and a capacitor C335, the 1-pin of the linear voltage stabilizing chip U59 is further connected with a resistor R88 and a resistor R501 respectively, one end of the resistor R501 is connected to the 3-pin of the linear voltage stabilizing chip U59, and one end of the resistor R88 and one end of the resistor R501 are connected with a capacitor C168, a capacitor C170 and a capacitor C172 arranged in parallel.

[0033] The one end of the capacitor C235, the capacitor C238, the capacitor C205, the capacitor C335, the capacitor C334, the resistor R88, the capacitor C168, the capacitor C170 and the capacitor C172 is grounded.

[0034] The linear voltage stabilizing chip U59 is LM337, which is an adjustable negative voltage stabilizer, providing-12V output voltage; the resistor R88 is used for setting the output voltage of the LM337, and the resistor R501 and the resistor R88 form a voltage divider to adjust the output voltage; the capacitor C168 is used for stabilizing the input voltage of the LM337, the capacitor C170 is used for output decoupling, reducing the output ripple, and the capacitor C172 is used for filtering to prevent voltage fluctuation caused by load mutation.

[0035] The protection circuit is used for preventing the current from flowing reversely in the circuit.

[0036] The protection circuit comprises a diode Ln11 connected between the 7th pin and the 8th pin of the voltage reducing stabilizing chip U55 and a diode Ln3 connected to the 4th pin of the inductor L1, the diode Ln11 and the diode Ln3 prevent the current from flowing reversely, the protection circuit, one end of the diode Ln11 is also connected to the-15V power output end, the 2nd pin of the inductor L1 is connected with the capacitor C235, the capacitor C238 and the capacitor C205 which are arranged in parallel and connected to the-15V power output end, one end of the diode Ln3 is connected to the+15V power output end and connected with the capacitor C153, the capacitor C203 and the capacitor C204 which are arranged in parallel.

[0037] The positive voltage stabilizing circuit, the negative voltage stabilizing circuit and the protection circuit are electrically connected with the main voltage reducing conversion circuit, the positive voltage stabilizing circuit and the negative voltage stabilizing circuit are arranged in parallel and grounded, the positive voltage stabilizing circuit is a DCDC voltage reducing circuit, and the negative voltage stabilizing circuit is an LDO linear voltage stabilizing circuit.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A circuit for a single input, dual output, bi-stable voltage power supply, characterized by, The utility model relates to a kind of voltage regulator, comprising: a main step-down conversion circuit for reducing and stabilizing an input voltage to a desired output voltage; a positive voltage regulator for providing an adjustable positive voltage output; a negative voltage regulator for providing an adjustable negative voltage output; a protection circuit for preventing current backflow in the circuit. The positive voltage regulator, the negative voltage regulator and the protection circuit are electrically connected to the main step-down conversion circuit, and the positive voltage regulator and the negative voltage regulator are connected in parallel and grounded.

2. A circuit for a single input, dual output voltage regulator power supply according to claim 1, wherein: The main step-down conversion circuit comprises a step-down voltage regulator chip U55 and an inductor L1.

3. A circuit for a single input supply dual output voltage regulator power supply as claimed in claim 2, wherein: The step-down voltage regulator chip U55 is connected to a 36V input voltage through its pin 2, and a capacitor C223 and a capacitor C341 connected in parallel are connected to the pin 2.

4. A single input voltage supply dual output voltage supply circuit according to claim 3, wherein: The pin 1 of the step-down voltage regulator chip U55 is connected to the pin 8 through a capacitor C76, and the pin 1 of the inductor L1 is connected to the pin 8 of the step-down voltage regulator chip U55.

5. A single input supply dual regulated power supply circuit as claimed in claim 4, wherein: The pin 4 of the step-down voltage regulator chip U55 is connected to a resistor R503, the pin 5 of the step-down voltage regulator chip U55 is connected to a capacitor C337, a resistor R502 and a capacitor C338 connected in series, respectively, the pin 6 of the step-down voltage regulator chip U55 is connected to a resistor R62 and a resistor R500, respectively, and one end of the resistor R503, the capacitor C337, the capacitor C338 and the resistor R500 is connected to a -15V power output terminal.

6. A circuit for a single input supply dual output voltage regulator power supply as claimed in claim 5, wherein: The protection circuit comprises a diode Ln11 connected between the pin 7 and the pin 8 of the step-down voltage regulator chip U55, and a diode Ln3 connected to the pin 4 of the inductor L1, one end of the diode Ln11 is also connected to the -15V power output terminal, the pin 2 of the inductor L1 is connected to a capacitor C235, a capacitor C238 and a capacitor C205 connected in parallel and connected to the -15V power output terminal, one end of the diode Ln3 is connected to a +15V power output terminal and connected to a capacitor C153, a capacitor C203 and a capacitor C204 connected in parallel. The positive voltage regulator comprises a linear voltage regulator chip U14, the pin 3 of the linear voltage regulator chip U14 is connected to a +15V power output terminal, the pin 2 of the linear voltage regulator chip U14 outputs a +12V voltage, the pin 1 and the pin 3 of the linear voltage regulator chip U14 are connected to a capacitor C152 and a capacitor C221, the pin 1 of the linear voltage regulator chip U14 is also connected to a resistor R60 and a resistor R61, respectively, and one end of the resistor R60 is connected to the pin 2 of the linear voltage regulator chip U14. The negative voltage regulator comprises a linear voltage regulator chip U59, the pin 2 of the linear voltage regulator chip U59 is connected to a -15V power output terminal, the pin 3 of the linear voltage regulator chip U59 outputs a -12V voltage, the pin 1 and the pin 2 of the linear voltage regulator chip U59 are connected to a capacitor C334 and a capacitor C335, the pin 1 of the linear voltage regulator chip U59 is also connected to a resistor R88 and a resistor R501, respectively, and one end of the resistor R501 is connected to the pin 3 of the linear voltage regulator chip U59.

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