TWM536372U - Power supply apparatus with multi-stage soft-start function - Google Patents

Description

Power supply device with multi-stage soft start function

The present invention relates to a power supply device having a multi-stage soft start function.

Generally, devices such as motors or servos need to be connected to high-powered power supply devices in order to obtain the power supply provided by the power supply device for normal operation. However, the input terminals of devices such as motors or servos often have a voltage stabilizing line (usually composed of a large capacitor) to provide a voltage regulation function when the load changes. When the main power switch of the high-power power supply device is activated for a moment, the large capacitance of these voltage-regulating lines instantaneously generates a huge current, so-called inrush current. These excessive surge currents cause the protection circuit to misjudge the circuit and cause a short circuit to activate the short circuit protection function, resulting in the motor or servo not functioning properly.

In addition, in order to avoid the malfunction of the protection circuit, in order to enable the power supply device to supply power to the load (motor or servo), some manufacturers will cancel or improve the protection point; however, the long-term allowable surge current will occur. The power supply device and its internal components are damaged, so that the power supply device is unstable or the life is shortened. Therefore, there is still room for improvement in the power supply device. A new architecture is needed to maintain the product's normal operation and reliability.

In view of this, the present invention provides a power supply device having a multi-stage soft start function, which avoids the occurrence of damage to the circuit function by the generation of surge current, thereby increasing the safety of circuit use.

The present invention provides a power supply architecture with a multi-stage soft start function, which is suitable for supplying power to a load, and the load includes a voltage stabilizing unit and a load unit coupled in parallel. A power supply device having a multi-stage soft start function includes a power supply unit, a soft start adjustment unit, a current detection unit, and a control unit. The power supply unit generates a power supply voltage. The soft start adjustment unit is coupled to the power supply unit and is adapted to be coupled to the voltage stabilization unit, and receives the power supply voltage, the first control signal, the second control signal, and the plurality of third control signals, according to the first control signal and the second control signal. The third control signal converts the power supply voltage into a soft start current, and adjusts and outputs the soft start current to the voltage stabilization unit or outputs the power supply voltage to the voltage stabilization unit. The current detecting unit is coupled to the power unit and is adapted to be coupled to the voltage stabilizing unit to measure a current of a loop formed between the power unit and the voltage stabilizing unit to generate a current detecting signal. The control unit is coupled to the current detecting unit and receives the current detecting signal to generate the first control signal, the second control signal and the third control signal.

In an embodiment, the aforementioned soft start adjustment unit includes a first switch unit and a current adjustment unit. The first switching unit is coupled to the power unit and the control unit and is adapted to be coupled to the voltage stabilizing unit, and receives the power voltage and the first control signal to output the power voltage to the voltage stabilizing unit according to the first control signal. The current adjustment unit is coupled to the control unit and coupled to the first switch unit in parallel, receives the power voltage, the second control signal and the third control signal, converts the power voltage into a soft start current, and adjusts and outputs the soft start current to the voltage stabilization unit. .

In an embodiment, the current adjustment unit includes N first resistors, a second switch unit, and (N-1) third switch units, where N is a positive integer greater than one. The N first resistors are sequentially coupled in series, wherein the first first resistor is coupled to the power supply unit. The second switching unit is coupled to the Nth first resistor, the control unit, and the voltage stabilizing unit, and receives the second control signal. The ith third switching unit is coupled in parallel with the (i+1)th first resistor, and the (N-1) third switching units are coupled to the control unit to receive the third control signal, where 0<i≦ N-1.

In an embodiment, the second switch unit is a field effect transistor, the first end of the second switch unit receives the second control signal, the second end of the second switch unit is coupled to the Nth first resistor, and the second The third end of the switch unit is coupled to the voltage stabilizing unit.

In an embodiment, the (N-1)th third switching units are each a field effect transistor, and the first ends of the (N-1) third switching units respectively receive corresponding third control signals, i The second end of the third switch unit is coupled to the first end of the (i+1)th first resistor, and the third end of the ith third switch unit is coupled to the (i+1)th first resistor Second end.

In an embodiment, the first switch unit is a field effect transistor, the first end of the first switch unit receives the first control signal, and the second end of the first switch unit is coupled to the power unit, and the first switch unit The three terminals are coupled to the voltage regulator unit.

In an embodiment, the soft start adjustment unit includes N second resistors, a fourth switch unit, a fifth switch unit, and (N-1) sixth switch units, where N is a positive integer greater than one. The N second resistors are sequentially coupled in series, wherein the first second resistor is coupled to the power supply unit. The fourth switching unit is coupled to the Nth second resistor, the control unit, and the voltage stabilizing unit, and receives the first control signal. The fifth switch unit is coupled in parallel with the first second resistor and the control unit to receive the second control signal. The ith sixth switching unit is coupled in parallel with the (i+1)th second resistor, and the (N-1) sixth switching units are coupled to the control unit to receive the third control signal, where 0<i≦ N-1.

In an embodiment, the fourth switch unit is a field effect transistor, the first end of the fourth switch unit receives the first control signal, and the second end of the fourth switch unit is coupled to the Nth second resistor, and the fourth The third end of the switch unit is coupled to the voltage stabilizing unit.

In an embodiment, the fifth switch unit is a field effect transistor, the first end of the fifth switch unit receives the second control signal, and the second end of the fifth switch unit is coupled to the first end of the first second resistor. The third end of the fifth switch unit is coupled to the second end of the first second resistor.

In an embodiment, the (N-1) sixth switching units are field effect transistors, and the first ends of the (N-1) sixth switching units respectively receive corresponding third control signals, the i-th The second end of the six-switch unit is coupled to the first end of the (i+1)th second resistor, and the third end of the ith sixth switch unit is coupled to the second (i+1)th second resistor end.

In an embodiment, the aforementioned power supply unit is a power supply or a battery pack.

In an embodiment, the aforementioned control unit is a microcontroller or a microprocessor.

In an embodiment, the foregoing power supply device having a multi-stage soft start function further includes a display unit. The display unit is coupled to the control unit, and receives a fourth control signal generated by the control unit to display the fourth control signal.

In an embodiment, the foregoing power supply device having a multi-stage soft start function further includes a voltage detecting unit. The voltage detecting unit is coupled to the control unit and is adapted to be coupled in parallel with the voltage stabilizing unit to measure the operating voltage generated by the voltage stabilizing unit to generate a voltage detection signal to the control unit.

The power supply device with the multi-stage soft start function provided by the embodiment generates a first control signal, a second control signal and a plurality of third control signals by the control unit according to the current detection signal generated by the current detecting unit. To control the soft start adjustment unit to adjust the current value of the soft start current, so that the operating voltage generated by the voltage regulator unit can be appropriately increased to the same or close to the voltage value of the power supply voltage according to the soft start adjustment unit to complete the soft start procedure. Then, the power supply voltage is directly output to the voltage stabilization unit. In this way, it is possible to effectively avoid the occurrence of a surge current and cause damage to the circuit function. In addition, it is also displayed through the display unit whether or not the circuit has a short circuit to increase the safety of the circuit. In addition, the control unit may further generate the corresponding first control signal, the second control signal and the plurality of third control signals according to the current detection signal and the voltage detection signal generated by the voltage detecting unit, and may also avoid the surge current. The effect of the occurrence of damage to the circuit function.

The above description of the present invention and the following description of the embodiments are intended to illustrate and explain the spirit and principles of the present invention, and to provide a further explanation of the scope of the patent application of the present invention.

The detailed features and advantages of the present invention are described in detail below in the embodiments, which are sufficient to enable any skilled artisan to understand the technical contents of the present invention and implement it according to the contents, the scope of the patent application and the drawings. Anyone familiar with the relevant art can easily understand the purpose and advantages of this creation. The following examples further illustrate the inventive concept, but do not limit the scope of the creation in any way.

Certain terms are used throughout the description and claims to refer to particular elements. Those skilled in the art will appreciate that a hardware manufacturer may refer to the same component by a different noun. The scope of the present specification and the patent application do not use the difference in the name as the means for distinguishing the elements, but the difference in function of the elements as the criterion for distinguishing. As used in the specification and the scope of the patent application, "include" is an open term and should be interpreted as "including but not limited to". "Substantially" means that within the range of acceptable errors, those skilled in the art will be able to solve the technical problems within a certain error range, substantially achieving the technical effects. In addition, the term "coupled" is used herein to include any direct and indirect electrical coupling means. Therefore, if a first device is coupled to a second device, the first device can be directly electrically coupled to the second device, or electrically coupled indirectly through other devices or coupling means. Connected to the second device. The description of the specification is intended to be illustrative of the preferred embodiments of the invention. The scope of protection of this application is subject to the definition of the scope of the appended claims.

It is also to be understood that the terms "comprises", "comprising" or "comprising" or any other variations are intended to encompass a non-exclusive inclusion, such that a process, method, article, or Other elements not explicitly listed, or elements that are inherent to such a process, method, commodity, or system. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or system including the element, without further limitation.

In the various embodiments listed below, the same or similar elements or members will be denoted by the same reference numerals.

FIG. 1 is a schematic diagram of a power supply device having a multi-stage soft start function disclosed in an embodiment of the present invention. The power supply device 100 of the present embodiment having a multi-stage soft start function can be adapted to supply power to the load 190 such that the load 190 can operate normally. In the present embodiment, the load 190 includes a voltage stabilizing unit 191 and a load unit 192 coupled in parallel. The voltage stabilizing unit 191 is, for example, a capacitor and has a voltage stabilizing function, and the load unit 190 is, for example, a motor or a servo.

The power supply device 100 having a multi-stage soft start function includes a power supply unit 110, a soft start adjustment unit 120, a current detection unit 130, and a control unit 140.

The power supply unit 110 is configured to generate a power supply voltage. In the present embodiment, the power supply unit 110 is, for example, a power supply or a battery pack to generate a high-power supply voltage for use in providing the load 190 for use.

The soft start adjustment unit 120 is coupled to the power supply unit 110, and receives the power supply voltage, the first control signal, the second control signal, and the plurality of third control signals, according to the first control signal, the second control signal, and the third control signal. The power supply voltage is converted into a soft start current, and the soft start current is adjusted and outputted to the voltage stabilizing unit 191, or the power supply voltage is output to the voltage stabilizing unit. That is, the soft start adjustment unit 120 is controlled by the first control signal, the second control signal, and the plurality of third control signals to adjust the magnitude of the soft start current. For example, when the soft start adjustment unit 120 starts to operate soft start, the current value of the soft start current is dynamically controlled according to the control of the first control signal, the second control signal, and the third control signal of the control unit 140.

The current detecting unit 130 is coupled to the power supply unit 110 and is adapted to be coupled to the voltage stabilizing unit 191 to measure a current of a loop formed between the power supply unit 110 and the voltage stabilizing unit 191 (ie, a system loop) to generate a current detecting signal. During the soft start process, the current detection signal may specifically reflect the state of the current between the power supply unit 110 and the voltage stabilizing unit 191.

The control unit 140 is coupled to the current detecting unit 130 and receives the current detecting signal to generate a first control signal, a second control signal, and a plurality of third control signals. That is, the control unit 150 generates a corresponding first control signal, second control signal and a plurality of third control signals according to the state of the current in the current detection signal, so as to control the soft start adjustment unit 120 to adjust the soft start current value. The size, that is, for example, gradually reduces the series resistance in the soft start adjustment unit 120 to maintain the soft start current at the maximum allowed by the series resistance power, so that the operating voltage established by the voltage stabilization unit 191 is rapidly increased to be the same as the power supply. The voltage value of the voltage. In the present embodiment, the control unit 140 is, for example, a microcontroller or a microprocessor.

In the overall operation of the power supply device 100 and the load 190 having the multi-stage soft start function, first, the power supply unit 110 outputs a power supply voltage, and at this time, the operating voltage on the voltage stabilizing unit 191 is not established, for example, 0V. The soft start adjustment unit 120 generates, for example, a starting soft start current preset according to the series resistance power according to the first control signal, the second control signal, and the third control signal. As the operating voltage of the voltage stabilizing unit 191 is gradually established, the soft-start current is lowered due to a decrease in the voltage difference between the power supply voltage and the operating voltage of the voltage stabilizing unit 191.

Then, the control unit 140 performs a logic determination according to the monitoring result of the current detecting unit 160, and sequentially generates a first control signal, a second control signal, and a plurality of third control signals of different logic levels to control the soft start adjusting unit. 120 to dynamically adjust the soft start current. That is, by controlling to reduce the resistance of the series resistance in the soft start adjustment unit 120, the current value of the soft start current is increased to a power acceptable current value corresponding to the series resistance of the soft start loop. In addition, the operating voltage established by the voltage stabilizing unit 191 further provides the load unit 192 to enable the load unit 192 to operate normally.

According to the above description, the control unit 140 generates the first control signal, the second control signal and the plurality of third control signals according to the current detection signal to control the soft start adjustment unit 120 to adjust the value of the soft start current value, so that The operating voltage generated by the voltage stabilizing unit 191 is gradually increased to the same or close to the voltage value of the working voltage to complete the soft start procedure, and then the soft start adjusting unit 120 directly outputs the power voltage to the voltage stabilizing unit 191 to let the voltage stabilizing unit 191 generates an operating voltage equal to the supply voltage to the load unit 192 for use by the load unit 192. In this way, it is possible to effectively avoid the occurrence of the inrush current (Inruch Current) and cause damage to the circuit function, thereby increasing the safety of the circuit.

In addition, the control unit 140 may also compare the current detection signal with a preset current value (overcurrent or short circuit current) to generate a fourth control signal. For example, when the current value of the current detection signal is less than the preset current value, indicating that the circuit has no short circuit, the control unit 140 generates a fourth control signal, for example, a low logic level; when the current value of the current detection signal is greater than When the current value is preset, it indicates that the circuit has a short circuit, and the control unit 140 generates a fourth control signal such as a high logic level.

Further, the power supply device 100 having the multi-stage soft start function further includes a display unit 150. The display unit 150 is coupled to the control unit 140 and receives the fourth control signal generated by the control unit 140 to display the fourth control signal. The display unit 150 is, for example, an indicator light. For example, when the display unit 150 receives the fourth control signal of the low logic level, the display unit 150 does not illuminate to indicate that the circuit does not have a short circuit. When the display unit 150 receives the fourth control signal of the high logic level, the display unit 150 illuminates to indicate that the circuit has a short circuit, thereby informing the user that the power supply device 100 having the multi-stage soft start function is required. Or its load 190 for subsequent maintenance. In this way, the embodiment can further show whether the circuit has a short circuit to increase the safety of the power supply device 100 having the multi-stage soft start function or the entire system.

In addition, the power supply device 100 having a multi-stage soft start function further includes a voltage detecting unit 160. The voltage detecting unit 160 is coupled to the control unit 140 and is coupled to the voltage stabilizing unit 191 (ie, coupled to both ends of the voltage stabilizing unit 191), and measures the operating voltage generated by the voltage stabilizing unit 191 to generate a voltage detecting signal to The control unit 140 performs subsequent processing. During the soft start process, the voltage detection signal may specifically reflect the state in which the operating voltage of the voltage stabilizing unit 191 is established. Further, in an embodiment, the control unit 140 can monitor the establishment of the operating voltage on the voltage stabilizing unit 191 during the soft start according to the voltage detection signal provided by the voltage detecting unit 160, so that the control unit 140 can simultaneously The soft start adjustment unit 120 is controlled according to the current detection signal and the voltage detection signal to generate the first control signal, the second control signal and the third control signal, thereby adjusting the output of the soft start current. In another embodiment, after the soft start is completed, the voltage detecting unit 160 can continue to monitor the power voltage of the power unit 110, and the control unit 140 can send other overvoltage or undervoltage protection signals as appropriate.

In addition, in the embodiment illustrated in FIG. 1 , the soft start adjustment unit 120 is configured to be coupled to the positive end of the power supply unit 110 , and the current detection unit 130 is configured to be coupled to the negative end of the power supply unit 110 . However, the present invention is not limited thereto, and the soft start adjustment unit 120 and the current detection unit 130 can be replaced with the configured position, that is, the soft start adjustment unit 120 can be configured to be coupled to the negative end of the power supply unit 110, and the current detection unit 140 can be configured on the power supply. The positive end of unit 110 can also achieve the same effect. Moreover, the implementation of the replaced system architecture can still refer to the description of FIG. 1, and therefore will not be further described herein.

FIG. 2 is a detailed circuit diagram of a soft start adjustment unit disclosed in the embodiment of the present invention. The soft start adjustment unit 120 includes a first switch unit 210 and a current adjustment unit 220.

The first switch unit 210 is coupled to the power supply unit 110 and the control unit 140 and is adapted to be coupled to the voltage stabilization unit 191 to receive the power supply voltage and the first control signal to output the power supply voltage to the voltage stabilization unit 191 according to the first control signal.

The current adjustment unit 220 is coupled to the control unit 140 and coupled to the first switch unit 210 in parallel, receives the power voltage, the second control signal and the third control signal, converts the power voltage into a soft start current, and adjusts and outputs the soft start current to Voltage stabilizing unit 191.

Further, the current adjustment unit 220 includes N first resistors R11, R12, . . . , R1N, a second switch unit S2, and (N-1) third switch units S31, S32, . . . S3N-1, where N is A positive integer greater than one.

The N first resistors R11, R12, ..., R1N are coupled in series in series, wherein the first first resistor R11 is coupled to the power supply unit 110. That is, the first end of the first resistor R11 is coupled to the power source unit 110, the second end of the first resistor R11 is coupled to the first end of the first resistor R12, and the second end of the first resistor R12 is coupled to the first resistor The first end of the first resistor R1N-1 is coupled to the first end of the resistor R1N.

The second switch unit S2 is coupled to the Nth first resistor R1N, the control unit 140, and the voltage stabilization unit 191, and receives the second control signal C2. That is, the second switch unit S2 is coupled to the second end of the first resistor R1N. And, the second switching unit S2 receives the second control signal C2 to be turned on or off by the control of the second control signal C2.

The second switching unit S2 may be a field effect transistor (MOSFET), such as a P-type MOSFET. The first end of the second switching unit S2 (ie, the gate of the P-type MOSFET) receives the second control signal C2, and the second end of the second switching unit S2 (ie, the source of the P-type MOSFET) is coupled. Connected to the Nth first resistor R1N, the third end of the second switching unit S2 (ie, the drain of the P-type MOSFET is coupled to the voltage stabilizing unit 191. In another embodiment, the second switching unit S2 is also It can be implemented with an N-type MOSFET.

The i-th third switching unit S31, S32, ..., S3N-1 is coupled in parallel with the (i+1)th first resistors R11, R12, ..., R1N, and (N-1) third switching unit couplings Connected to the control unit to receive a plurality of third control signals, where 0 < i ≦ N-1. That is, the first third switching unit S31 is coupled in parallel with the second first resistor R12, and the second second switching unit S32 is coupled in parallel with the third first resistor R13, ..., (N- 1) The third switching unit S3N is coupled in parallel with the Nth first resistor R1N. And, the (N-1) third switching units S31, S32, ..., S3N-1 are coupled to the control unit 140 to receive the third control signals C31, C32, ..., C3N-1, and receive the third control signal C31, C32, ... C3N-1 is controlled to be turned on or off. Wherein, the number of the third control signals corresponds to the number of the third switching units.

In the present embodiment, the (N-1) third switching units S31, S32, ..., S3N-1 may each be a field effect transistor, such as a P-type MOSFET. The first ends of the (N-1) third switching units S31, S32, ..., S3N-1 (ie, the gate terminals of the P-type MOSFET) respectively receive corresponding third control signals C31, C32, ... C3N-1, The second ends of the i third switching units S31, S32, ..., S3N-1 (ie, the source terminals of the P-type MOSFETs) are coupled to the first of the (i+1)th first resistors R12, R13, ..., R1N The third end of the i-th third switching unit S31, S32, ..., S3N-1 (ie, the 汲 terminal of the P-type MOSFET) is coupled to the (i+1)th first resistor R12, R13, ..., R1N The second end. In another embodiment, the third switching unit S31, S32, ..., S3N-1 can also be implemented, for example, as an N-type MOSFET.

In addition, in the present embodiment, the first switching unit S1 is a field effect transistor, such as a P-type MOSFET. The first end of the first switching unit S1 (ie, the gate terminal of the P-type MOSFET) receives the first control signal C1, and the second end of the first switching unit S1 (ie, the source terminal of the P-type MOSFET) is coupled to the power supply unit 110, The third terminal of a switching unit S1 (ie, the 汲 terminal of the P-type MOSFET) is coupled to the voltage stabilizing unit 191. Further, the first switching unit S1 is a high-power field effect transistor.

In overall operation, when the power supply device 110 having the multi-stage soft start function starts to operate, the control unit 140 generates a first control signal C1 of a high logic level, a second control signal C2 of a low logic level, and a high The third control signals C31, C32, ..., C3N-1 of the logic level are such that the first switching unit 120 is not turned on, the second switching unit S2 is turned on, and the third switching units S31, S32, ..., S3N-1 are not turned on. The path through which the soft-start current flows is the first resistor R11, the first resistor R12, ..., the first resistor R1N, and the second switching unit S2. Next, the control unit 140 maintains the first control signal C1 and the third control signals C32, . . . , C3N-1 at a high logic level and the second control signal C2 at a low logic level, and the third control signal C31 from a high logic. The level is switched to the low logic level, so that the second switching unit S2 and the third switching unit S31 are turned on, and the path through which the soft-start current flows is the first resistor R11, the third switching unit S31, the first resistor R13, ..., The first resistor R1N and the second switching unit S2.

Thereafter, the control unit 140 maintains the first control signal C1 and the third control signals C33, . . . , C3N-1 at a high logic level and the second control signal C2 and the third control signal C31 at a low logic level, and the third The control signal C32 is switched from the high logic level to the low logic level, so that the second switching unit S2 and the third switching unit S31 and S32 are turned on, and the path through which the soft start current flows is the first resistor R11 and the third switching unit S31. The third switching unit S32, the first resistor R14, ..., the resistor Rn, and the second switching unit S2.

Then, the control unit 140 sequentially converts the remaining third control signals C33, C34, ..., C3N-1 from a high logic level to a low logic level until the third control signal C3N-1 is converted from a high logic level to Low logic level. That is, when the control unit 140 converts all the third control signals C31, C32, ..., C3N-1 from the high logic level to the low logic level, the path through which the soft start current flows is the first resistor R11, The third switching units S31, S32, ..., S3N-1, and the second switching unit S2, such that the operating voltage generated by the voltage stabilizing unit 191 can be increased to a voltage value close to the power supply voltage.

Then, when the operating voltage of the voltage stabilizing unit 191 is close to or nearly coincides with the operating voltage generated by the power supply unit 110, the control unit 140 generates a first control signal C1, for example, a low logic level, to TURN ON the first switching unit. 210, the first switching unit 210 is turned on, and generates a second control signal C2 and a third control signal C31, C32, ..., C3N-1, for example, a high logic level, so that the second switching unit S2 and the third switching unit S31 , S32, . . . , S3N-1 are not turned on to turn off the current adjustment unit 220 to complete the soft start process, so that the voltage stabilization unit 191 can generate the same operating voltage as the power supply voltage to the load unit 192. In order to gradually reduce the series resistance in the current adjustment unit 220, the soft start current is maintained at a maximum value allowed by the series resistance power, so that the operating voltage established by the voltage stabilization unit 191 reaches the same voltage as the power supply voltage. The value can effectively avoid the occurrence of surge current and damage the circuit function, so as to increase the safety of the circuit.

FIG. 3 is another detailed circuit diagram of the soft start adjustment unit disclosed in the embodiment of the present invention. The soft start adjustment unit 120 includes N second resistors R21, R22, ..., R2N, a fourth switch unit S4, a fifth switch unit S5, and (N-1) sixth switch units S61, S62, ..., S6N-1 Where N is a positive integer greater than one.

The N second resistors R21, R22, ..., R2N are coupled in series in series, wherein the first second resistor R21 is coupled to the power supply unit 110. That is, the first end of the second resistor R21 is coupled to the power unit 110, the second end of the second resistor R21 is coupled to the first end of the second resistor R22, and the second end of the second resistor R22 is coupled to the second resistor The first end of the second resistor R2N-1 is coupled to the first end of the second resistor R2N.

The fourth switch unit S4 is coupled to the Nth second resistor R2N, the control unit 140, and the voltage stabilization unit 191, and receives the first control signal. That is, the fourth switch unit S4 is coupled to the second end of the second resistor R2N. And, the fourth switching unit S4 receives the first control signal C1 to be turned on or off by the control of the first control signal C1.

In this embodiment, the fourth switching unit S4 may be a field effect transistor, such as a P-type MOSFET. The first end of the fourth switching unit S4 (ie, the gate terminal of the P-type MOSFET) receives the first control signal C1, and the second end of the fourth switching unit S4 (ie, the source terminal of the P-type MOSFET) is coupled to the Nth second The resistor R2N, the third end of the fourth switching unit S4 (ie, the 汲 terminal of the P-type MOSFET) is coupled to the voltage stabilizing unit 191. In another embodiment, the fourth switching unit S4 can also be implemented, for example, as an N-type MOSFET.

The fifth switch unit S5 is coupled in parallel with the first second resistor R21 and the control unit 140 to receive the second control signal. That is, the fifth switching unit S5 receives the second control signal C2 to be turned on or off by the control of the second control signal C2.

The i-th sixth switching unit S61, S62, ..., S6N-1 is coupled in parallel with the (i+1)th second resistors R22, R23, ..., R2N. That is, the sixth switching unit S61 is coupled in parallel with the second resistor R22, the sixth switching unit S62 is coupled in parallel with the second resistor R23, ..., the sixth switching unit S6N-1 is coupled in parallel with the second resistor R2N. And, the second switch units S61, S62, ..., S6N-1 are coupled to the control unit 140 to receive the third control signals C31, C32, ..., C3N-1, and are subjected to the third control signals C31, C32, ..., C3N-1 Controlled with or without conduction.

In the present embodiment, (N-1) sixth switching units S61, S62, ..., S6N-1 may be MOSFETs, such as P-type MOSFETs. The first ends of the (N-1) sixth switching units S61, S62, ..., S6N-1 (ie, the gate terminals of the P-type MOSFET) receive corresponding third control signals C31, C32, ..., C3N-1, i-th The second ends of the sixth switching units S61, S62, ..., S6N-1 (ie, the source terminals of the P-type MOSFETs) are coupled to the first ends of the (i+1)th second resistors R22, R23, ..., R2N, The third ends of the sixth sixth switching units S61, S62, ..., S6N-1 (ie, the 汲 terminal of the P-type MOSFET) are coupled to the second ends of the (i+1)th second resistors R22, R23, ..., Rn . In another embodiment, the sixth switching unit S61, S62, ... S6N-1 can also be implemented, for example, as an N-type MOSFET.

In overall operation, when the power supply device 100 having the multi-stage soft start function starts to operate, the control unit 140 generates a first control signal C1 having a low logic level and a second control signal C2 and a high logic level, for example. The three control signals C31, C32, ... C3N-1 are such that the fourth switching unit S4 (P-type MOSFET) is turned on, and the fifth switching unit S5 and the sixth switching unit S61, S62, ..., S6N are not turned on, and the soft-start current flows. The path is the second resistor R21, the second resistor R22, ..., the second resistor R2N, and the fourth switching unit S4. Next, the control unit 140 maintains the first control signal C1 at a low logic level and the second control signal C2 and the third control signals C32, . . . , C3N-1 maintain a high logic level, and the third control signal C31 is high logic. The level is switched to the low logic level, so that the fourth switching unit S4 and the third switching unit S61 are turned on, and the path through which the soft-start current flows is the second resistor R21, the sixth switching unit S61, the second resistor R23, ..., The second resistor R2N and the fourth switching unit S4.

Thereafter, the control unit 140 maintains the first control signal C1 and the third control signal C31 at a low logic level and the second control signal C2 and the third control signal C33, . . . , C3N-1, and the third control signal C32 is high. The logic level is switched to the low logic level, so that the fourth switching unit S4 and the third switching unit S31 and S32 are turned on, and the path through which the soft start current flows is the second resistor R21, the third switching unit S31, and the second switching unit. S32, second resistor R24..., second resistor R2N, and fourth switch unit S4.

Then, the control unit 140 sequentially switches the remaining third control signals C33, . . . , C3N-1 from the high logic level to the low logic level until the third control signal C3N-1 is switched from the high logic level to the low level. Logical level up to now. That is, when the control signal 140 converts all the third control signals C31, C32, ..., C3N-1 from the high logic level to the low logic level, the path through which the soft start current flows is the second resistor R21, The third switching unit S31, S32, ..., S3N-1, and the fourth switching unit S4.

Then, when the operating voltage of the voltage stabilizing unit 191 is close to or nearly coincides with the operating voltage generated by the power supply unit 110, the control unit 140 converts the second control signal C2 from a high logic level to a low logic level to turn on the fifth. The switching unit S5 is configured to complete the soft start process so that the power supply voltage of the power supply unit 110 can be directly supplied to the voltage stabilizing unit 191, so that the voltage stabilizing unit 191 can generate the same operating voltage as the power supply voltage to the load unit 192. As a result, the series resistance in the soft start adjustment unit 120 is gradually lowered to maintain the soft start current at the maximum value allowed by the series resistance power, so that the operating voltage established by the voltage stabilization unit 191 is the same as the power supply voltage. The voltage value can effectively avoid the occurrence of surge current and cause damage to the circuit function, so as to increase the safety of the circuit.

The power supply device with the multi-stage soft start function provided by the embodiment generates a first control signal, a second control signal and a plurality of third control signals by the control unit according to the current detection signal generated by the current detecting unit. To control the soft start adjustment unit to adjust the current value of the soft start current, so that the operating voltage generated by the voltage regulator unit can be gradually increased to the same or close to the voltage value of the power supply voltage according to the soft start adjustment unit, completing the soft start procedure. Then, the power supply voltage is directly output to the voltage stabilization unit. In this way, it is possible to effectively avoid the occurrence of a surge current and cause damage to the circuit function. In addition, it is also displayed through the display unit whether or not the circuit has a short circuit to increase the safety of the circuit. In addition, the control unit may further generate the corresponding first control signal, the second control signal and the plurality of third control signals according to the current detection signal and the voltage detection signal generated by the voltage detecting unit, and may also avoid the surge current. The effect of the occurrence of damage to the circuit function.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the present invention. The changes and refinements that are made without departing from the spirit and scope of this creation are within the scope of patent protection of this creation. Please refer to the attached patent application scope for the scope of protection defined by this creation.

100‧‧‧Power supply unit with multi-stage soft start function
110‧‧‧Power unit
120‧‧‧Soft start adjustment unit
130‧‧‧current detection unit
140‧‧‧Control unit
150‧‧‧ display unit
160‧‧‧Voltage detection unit
190‧‧‧load
191‧‧‧Stabilizer
191‧‧‧Load unit
210‧‧‧First switch unit
220‧‧‧current adjustment unit
R11, R12, ..., R1N‧‧‧ first resistance
R21, R22, ..., R2N‧‧‧ second resistor
S2‧‧‧Second switch unit
S31, S32, ... S3N-1‧‧‧ third switch unit
S4‧‧‧fourth switch unit
S5‧‧‧ fifth switch unit
S61, S62, ...S6N-1‧‧‧ sixth switch unit
C1‧‧‧ first control signal
C2‧‧‧second control signal
C31, C32, ... C3N-1‧‧‧ third control signal

FIG. 1 is a schematic diagram of a power supply device having a multi-stage soft start function disclosed in an embodiment of the present invention. FIG. 2 is a detailed circuit diagram of a soft start adjustment unit disclosed in the embodiment of the present invention. FIG. 3 is another detailed circuit diagram of the soft start adjustment unit disclosed in the embodiment of the present invention.

100‧‧‧Power supply unit with soft start function

110‧‧‧Power unit

120‧‧‧Soft start adjustment unit

130‧‧‧current detection unit

140‧‧‧Control unit

150‧‧‧ display unit

160‧‧‧Voltage detection unit

190‧‧‧load

191‧‧‧Stabilizer

192‧‧‧Load unit

Claims (14)

A power supply device having a multi-stage soft start function, is adapted to supply power to a load, the load includes a voltage stabilizing unit and a load unit coupled in parallel, and the power supply having a multi-stage soft start includes: The power supply unit generates a power supply voltage; a soft start adjustment unit coupled to the power supply unit and coupled to the voltage stabilization unit, receiving the power supply voltage, a first control signal, a second control signal, and a plurality of third Controlling a signal to convert the power supply voltage into a soft start current according to the first control signal, the second control signal, and the third control signals, and adjusting and outputting the soft start current to the voltage stabilization unit or a power supply voltage is output to the voltage stabilizing unit; a current detecting unit coupled to the power supply unit and coupled to the voltage stabilizing unit, measuring a current of a loop formed between the power unit and the voltage stabilizing unit to generate a current detecting signal; and a control unit coupled to the current detecting unit to receive the current detecting signal to generate the first control signal, the second control signal, and the Some third control signals. The power supply device of claim 1, wherein the soft start adjustment unit comprises: a first switch unit coupled to the power supply unit and the control unit and adapted to be coupled to the voltage regulator The unit receives the power supply voltage and the first control signal to output the power supply voltage to the voltage stabilizing unit according to the first control signal; and a current adjusting unit coupled to the control unit and coupled to the first switch in parallel The unit receives the power voltage, the second control signal and the third control signals, and converts the power voltage into the soft start current to adjust and output the soft start current to the voltage stabilizing unit. The power supply device of claim 2, wherein the current adjustment unit comprises: N first resistors, and the N first resistors are sequentially coupled in series, wherein the first a resistor coupled to the power supply unit, wherein N is a positive integer greater than 1; a second switching unit coupled to the Nth first resistor, the control unit and the voltage stabilizing unit, and receiving the second control signal; (N-1) third switching units, the i-th third switching unit is coupled in parallel with the (i+1)th first resistor, and (N-1) third switching units are coupled to the control unit, Receiving the third control signals, where 0<i≦N-1. The power supply device of claim 3, wherein the second switch unit is a field effect transistor, and the first end of the second switch unit receives the second control signal, the second The second end of the switch unit is coupled to the Nth first resistor, and the third end of the second switch unit is coupled to the voltage stabilizing unit. A power supply device having a multi-stage soft start function according to claim 3, wherein (N-1) third switching units are each a field effect transistor, and (N-1) third switching units are respectively One end of each of the i-th third switching unit is coupled to the first end of the (i+1)th first resistor, and the third end of the i-th third switching unit The end is coupled to the second end of the (i+1)th first resistor. The power supply device of claim 2, wherein the first switch unit is a field effect transistor, and the first end of the first switch unit receives the first control signal, the first The second end of the switch unit is coupled to the power supply unit, and the third end of the first switch unit is coupled to the voltage stabilization unit. The power supply device of claim 1, wherein the soft start adjustment unit comprises: N second resistors, and the N second resistors are sequentially coupled in series, wherein the first one The second resistor is coupled to the power supply unit, wherein N is a positive integer greater than one; a fourth switching unit is coupled to the Nth second resistor, the control unit and the voltage stabilizing unit, and receives the first control signal; a fifth switching unit coupled in parallel with the first second resistor and the control unit to receive the second control signal; and (N-1) sixth switching units, an ith sixth switching unit and (i+1) second resistors are coupled in parallel, and (N-1) sixth switching units are coupled to the control unit to receive the third control signals, where 0<i≦N-1. The power supply device of claim 7, wherein the fourth switch unit is a field effect transistor, and the first end of the fourth switch unit receives the first control signal, the fourth The second end of the switch unit is coupled to the Nth second resistor, and the third end of the fourth switch unit is coupled to the voltage stabilizing unit. A power supply device having a multi-stage soft start function according to claim 7, wherein the fifth switch unit is a field effect transistor, and the first end of the fifth switch unit receives the second control signal, the fifth The second end of the switch unit is coupled to the first end of the first second resistor, and the third end of the fifth switch unit is coupled to the second end of the first second resistor. A power supply device having a multi-stage soft start function as claimed in claim 7, wherein (N-1) sixth switch units are each a field effect transistor, and (N-1) sixth switch units are first The second end of the ith sixth switch unit is coupled to the first end of the (i+1)th second resistor, and the third end of the ith sixth switch unit The second end of the (i+1)th second resistor is coupled. A power supply device having a multi-stage soft start function as claimed in claim 1, wherein the power supply unit is a power supply or a battery pack. A power supply device having a multi-stage soft start function as claimed in claim 1, wherein the control unit is a microcontroller or a microprocessor. The power supply device of claim 1, further comprising: a display unit coupled to the control unit, receiving a fourth control signal generated by the control unit to display the fourth control signal. The power supply device having the multi-stage soft start function according to claim 1, further comprising: a voltage detecting unit coupled to the control unit, and adapted to be coupled in parallel to the voltage stabilizing unit, and measuring the voltage stabilizing unit A working voltage is generated to generate a voltage detection signal to the control unit.