Circuit starting system based on direct current converter and chip

Abstract

The invention discloses a circuit starting system based on a direct-current converter and a chip, and relates to the technical field of direct-current converters. The system comprises a direct-current power supply used for being powered on to work when receiving a first starting request signal; the first end of the main load power switch is connected to the output end of the DC-DC converter, and the second end of the main load power switch is connected to the input end of the circuit to be started; the input end of the DC-DC converter is connected to a DC power supply, and the output end of the DC-DC converter is connected to the input end of the delay control circuit and the control end of the main load power switch through the energy storage filter circuit and used for outputting starting voltage according to the DC power supply; the energy storage filter circuit is used for storing energy based on the starting voltage and filtering the starting voltage; the power supply end of the delay control circuit is connected with a preset power supply, and the delay control circuit is used for delaying preset delay time and controlling the main load power switch to be turned on when the starting voltage is received, so that the circuit to be started is started through the starting voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of direct current converters, and in particular to a circuit starting system and a chip based on a direct current converter. Background Art

[0002] DC-DC (DC-to-DC converter) is a widely used converter in electronic products and is also widely used in chips. DC-DC can convert DC power into DC (or near-DC) power of different voltages, and its power range can range from very small (small battery) to very large (high voltage power conversion). It is of great significance to apply DC-DC converter to circuit startup. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the first object of the present invention is to provide a circuit startup system based on a DC converter to realize circuit startup through a DC-DC converter.

[0004] The second objective of the present invention is to provide a chip.

[0005] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a circuit startup system based on a DC converter, comprising: a DC power supply, which is used to power on when a first startup request signal is received; a main load power switch, wherein a first end of the main load power switch is connected to an output end of a DC-DC converter, and a second end of the main load power switch is connected to an input end of a circuit to be started; the DC-DC converter, wherein an input end of the DC-DC converter is connected to the DC power supply, and an output end of the DC-DC converter is connected to an input end of a delay control circuit and a control end of the main load power switch through an energy storage filter circuit, and the DC-DC converter is used to output a startup voltage according to the DC power supply; the energy storage filter circuit is used to store energy based on the startup voltage and filter the startup voltage; the delay control circuit, wherein a power supply end of the delay control circuit is connected to a preset power supply, and is used to delay a preset delay time when receiving the startup voltage, and control the main load power switch to turn on, so as to start the circuit to be started through the startup voltage.

[0006] In addition, the circuit startup system based on the DC converter according to the embodiment of the present invention may also have the following additional technical features: In one embodiment of the present invention, the DC-DC converter includes: a DC power supply power-on detection device, the input end of the DC power supply power-on detection device is connected to the DC power supply, the output end of the DC power supply power-on detection device is connected to the input end of the DC-DC conversion controller, and is used to output a control signal when the DC power supply is detected to be powered on and started; a DC-DC power output circuit, the input end of the DC-DC power output circuit is connected to the DC power supply, and the output end of the DC-DC power output circuit is designed to be the output end of the DC-DC converter; a DC-DC conversion controller, the output end of the DC-DC conversion controller is connected to the control end of the DC-DC power output circuit, and is used to control the DC-DC power output circuit to obtain and output the starting voltage according to the current provided by the DC power supply when receiving the control signal.

[0007] In one embodiment of the present invention, the delay control circuit includes: a digital power detection circuit, the input end of the digital power detection circuit is designed to be the input end of the delay control circuit, the output end of the digital power detection circuit is connected to the first input end of the first OR gate, and the digital power detection circuit is used to output a high-level signal when receiving the startup voltage output by the DC-DC converter; the first OR gate, the second input end of the first OR gate is connected to the first external request device, and is used to receive a high-level second startup request signal output by the first external request device; a delay sub-circuit, the input end of the delay sub-circuit is connected to the output end of the first OR gate, the output end of the delay sub-circuit is designed to be the output end of the delay control circuit, and the delay sub-circuit is used to delay the preset delay time to output a first start signal for controlling the main load power switch to turn on when receiving the high-level signal output by the first OR gate.

[0008] In one embodiment of the present invention, the first start-up signal is a high-level signal, and the delay control circuit further includes: a second OR gate, a first input end of the second OR gate is connected to the output end of the delay sub-circuit, a second input end of the second OR gate is connected to a preset switch start-up device, and is used to receive a high-level second start-up signal output by the preset switch start-up device, and an output end of the second OR gate is connected to the control end of the main load power switch.

[0009] In one embodiment of the present invention, the main load power switch is a MOS tube.

[0010] In one embodiment of the present invention, the energy storage filter circuit includes an output voltage stabilizing capacitor and an inductor, the first end of the inductor is connected to the output end of the DC-DC converter, the second end of the inductor is connected to the input end of the delay control circuit and the control end of the main load power switch, the first end of the output voltage stabilizing capacitor is grounded, and the second end of the output voltage stabilizing capacitor is connected to the second end of the inductor.

[0011] In one embodiment of the present invention, the control signal is a high-level signal, and the DC-DC converter further includes: a third OR gate, a first input end of the third OR gate is connected to the output end of the DC power supply power-on detection device, a second input end of the third OR gate is connected to the output end of the second external request device, and is used to receive a high-level third start request signal output by the second external request device, and the output end of the third OR gate is connected to the input end of the DC-DC conversion controller; the DC-DC conversion controller is specifically used to control the DC-DC power output circuit to obtain and output the start voltage according to the current provided by the DC power supply when receiving a high-level signal.

[0012] In one embodiment of the present invention, the preset delay time is a delay time obtained based on the equivalent series resistance of the output stabilizing capacitor, the capacitance value of the output stabilizing capacitor, the voltage value of the output voltage of the DC-DC converter, the maximum output current of the DC-DC converter, and the static current and dynamic current of the circuit to be started when it is started.

[0013] In one embodiment of the present invention, the DC power supply is an analog power supply.

[0014] To achieve the above object, a second embodiment of the present invention provides a chip, including the above-mentioned circuit startup system based on a DC converter.

[0015] A circuit startup system and chip based on a DC converter according to an embodiment of the present invention include a DC power supply, which is used to power on when a first startup request signal is received; a main load power switch, wherein a first end of the main load power switch is connected to an output end of a DC-DC converter, a second end of the main load power switch is connected to an input end of a circuit to be started, and a control end of the main load power switch is connected to an output end of a delay control circuit; a DC-DC converter, wherein an input end of the DC-DC converter is connected to a DC power supply, and an output end of the DC-DC converter is connected to an input end of a delay control circuit through an energy storage filter circuit, wherein the DC-DC converter is used to output a startup voltage according to the DC power supply so as to store energy for the energy storage filter circuit through the startup voltage; an energy storage filter circuit, which is used to filter the startup voltage; and a delay control circuit, wherein a power supply end of the delay control circuit is connected to a preset power supply, and is used to delay a preset delay time when a startup voltage is received, and control the main load power switch to be turned on so as to start the circuit to be started through the startup voltage. Therefore, by setting the delay control circuit and the main load power switch, the DC-DC converter can first store energy for the energy storage filter circuit and then provide a starting voltage for the circuit to be started, thereby preventing the output current of the DC-DC converter from exceeding the maximum output current supported by the DC-DC converter, thereby achieving smooth startup of the circuit to be started.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the structure of an example starting circuit system; Figure 2 is a circuit diagram of an example inverter circuit; Figure 3 is a structural block diagram of a circuit startup system based on a DC converter according to an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a circuit starting system based on a DC converter according to an example of the present invention; Figure 5 is a schematic diagram of an output voltage stabilizing capacitor of an example of the present invention; Figure 6 It is a structural block diagram of a chip according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following describes a circuit startup system based on a DC converter according to an embodiment of the present invention with reference to the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described with reference to the accompanying drawings are exemplary and should not be construed as limiting the present invention.

[0019] In order to start the circuit, you can use Figure 1 The system for starting the circuit is shown.

[0020] Specifically, in Figure 1 In the process, the DC-DC control switch modulates the output LX, and supplies power to the load after passing through the inductor L and the energy storage and filtering capacitor Cout. When the system is powered on, the DC-DC is in the startup phase, and the DC-DC output needs to charge Cout, and the load circuit will also draw current. Generally speaking, the current of the DC-DC in the startup phase is limited. For example, the maximum output current Imax_startup is defined as 1 / 2 of the maximum output current Imax supported. If the sum of the Cout charging current and the load draw current is too large at power-on startup, it is easy to cause the internal circuit voltage of the DC-DC to be too low and work abnormally, such as self-reset, DC-DC output disappearance or repeated entry into hiccup mode.

[0021] The startup of the circuit may be that after receiving a startup signal, the circuit switches from a non-operating state to an operating state, thereby starting the circuit, or the circuit restarts after receiving a reset signal. That is, the startup request signal may be a startup signal or a reset signal.

[0022] The following is an explanation using the start request signal as a reset signal as an example.

[0023] The reset signal of the DC-DC can be generated from the following sources: 1. Generated by its own AVDD power-on reset detection circuit. 2. Generated by the DVDD low voltage reset detection circuit. 3. Generated by other reset sources (such as a cold reset request from an external pin).

[0024] The current at power-on is mainly divided into the charging current for Cout and the current drawn by the load circuit. The maximum charging current for Cout, Imax_cout, takes the maximum value of the charging current during the power-on process, which can be considered as the result of Vout divided by the equivalent series resistance of capacitor Cout. The current drawn by the load circuit mainly includes: static current and dynamic current.

[0025] That is, the current at the Vout terminal during the power-on startup process can be estimated as the sum of the maximum charging current, the static current, and the dynamic current.

[0026] The following uses static power consumption and dynamic power consumption as an example to explain the meaning of static current and dynamic current: Static power consumption is mainly leakage power consumption, that is, the power consumption caused by non-ideal leakage current of the channel, gate, substrate, etc.

[0027] Dynamic power consumption is mainly divided into: internal power consumption, that is, the power consumption caused by the charging and discharging of the internal parasitic parameters of the transistor and the short-circuit current; flip power consumption, that is, the power consumption caused by the charging and discharging of the transistor load.

[0028] When the DC-DC and the load are powered on together, the load circuit will at least generate static power consumption, which accounts for a large proportion of the total power consumption for nano-scale processes (for example, 30% of the total power consumption). In addition, since there are transient circuits during the load power-on process, the above dynamic power consumption will be generated at the same time.

[0029] See below for more information Figure 2 The example shown illustrates the dynamic power consumption described above.

[0030] Figure 2 It is an inverter circuit, which consists of an upper PMOS and a lower NMOS. C1 and C2 are the load capacitors of the inverter input and inverter output respectively. Assuming that during the power-on process to 1.1V, the inverter input charges C1 (the charging current is I1, causing flip power consumption); the inverter input voltage rises to 0.5V, at this time, both PMOS and NMOS are not completely turned off, I3 is the cross-current, causing internal power consumption; the inverter output charges C2 (the charging current is I2, causing flip power consumption).

[0031] exist Figure 1 In the figure, the maximum load operating current supported by the DC-DC is 1.5A, the maximum output current supported by the DC-DC for power-on startup is 750mA, and the actual maximum load operating current is 1.4A, leaving a margin of 100mA; during the power-on startup process, the maximum charging current is 400mA, the static current is 350mA, and the dynamic current is 150mA. The sum of the maximum charging current, static current, and dynamic current is 900mA, that is, the actual output current Iout exceeds the maximum supported output current of 750mA, and the DC-DC will self-reset and restart; during self-reset, first LX becomes 0, and starts to discharge Cout, and then repeats the above startup process. Due to the excessive startup voltage, the startup fails again. If a resistor is connected in series with the capacitor to reduce the power-on startup voltage, it is equivalent to increasing the equivalent series resistance of the capacitor, which will increase the ripple of Vout.

[0032] It should be noted that in Figure 1 In the figure, the meaning of each symbol is as follows.

[0033] 2011: Figure 1 The second DC-DC converter in.

[0034] 2012: Figure 1 The second DC-DC converter controller in Figure 1The second DC-DC power output circuit is integrated, the second DC-DC power output circuit is composed of an upper tube and a lower tube, which can be built in the chip or externally placed. Figure 1 It is built into the chip.

[0035] AVDD: Analog power supply terminal.

[0036] AVSS: Analog ground.

[0037] DC-DC POR Reset: power-on reset signal.

[0038] Reset: Reset signal.

[0039] 2013: Circuit that detects AVDD power-on and outputs a reset signal.

[0040] LX: Switch modulation output port of DC-DC conversion controller.

[0041] VSENSE: Output voltage feedback detection terminal.

[0042] L: output inductance.

[0043] Cout: capacitance.

[0044] Vout: output voltage.

[0045] VDD: Power supply terminal, generally refers to digital power supply, here refers to the power supply of the load (such as digital and analog circuits).

[0046] VSS: Ground, generally refers to the digital ground, this refers to the ground of the load (such as digital and analog circuits).

[0047] DVDD: specifically refers to the digital power supply terminal. Generally, digital circuits made with nanometer-level technology are huge in scale, consume a lot of power, and require a lot of current.

[0048] Loading: Load, including Figure 1 The third circuit to be started can be various digital or analog circuits.

[0049] 2014: Circuit for detecting DVDD low voltage and outputting reset signal.

[0050] Other Reset: Other reset sources, such as a cold reset request from an external pin.

[0051] 2015: Main circuits / loads, such as digital gate circuits, are Figure 1 The third circuit to be started in.

[0052] Therefore, the present invention proposes a circuit starting system based on a DC converter.

[0053] Figure 3 It is a structural block diagram of a circuit starting system based on a DC converter according to an embodiment of the present invention.

[0054] like Figure 3 As shown, a circuit startup system 10 based on a DC converter includes: a DC power supply 100, which is used to power on when a first startup request signal is received; a main load power switch 500, wherein a first end of the main load power switch 500 is connected to an output end of a DC-DC converter 101, and a second end of the main load power switch 500 is connected to an input end of a circuit to be started 400; a DC-DC converter 101, wherein an input end of the DC-DC converter 101 is connected to the DC power supply 100, and an output end of the DC-DC converter 101 is connected to an input end of a delay control circuit 300 and a control end of the main load power switch 500 through an energy storage filter circuit 200, and the DC-DC converter 101 is used to output a startup voltage according to the DC power supply 100; an energy storage filter circuit 200, which is used to store energy based on the startup voltage and filter the startup voltage; a delay control circuit 300, wherein a power supply end of the delay control circuit 300 is connected to a preset power supply, and is used to delay a preset delay time when receiving the startup voltage, and control the main load power switch 500 to turn on, so as to start the circuit to be started 400 through the startup voltage.

[0055] Specifically, a circuit startup system 10 based on a DC converter includes a DC power supply 100 , a DC-DC converter 101 , an energy storage filter circuit 200 , a main load power switch 500 and a delay control circuit 300 .

[0056] When receiving the first start-up request signal (the first start-up request signal may be a start-up signal or a reset signal), the DC power supply 100 is powered on and the DC-DC converter 101 may obtain a start-up voltage according to the DC power supply 100. The start-up voltage will be stabilized by the energy storage filter circuit 200 during operation, so that the start-up voltage provided to the circuit to be started 400 is a stabilized start-up voltage.

[0057] However, since the energy storage filter circuit 200 is a circuit that needs to store energy, that is, the DC power supply 100 needs to supply power to the energy storage filter circuit 200 so that the energy storage filter circuit 200 can store energy, and also needs to supply power to the circuit to be started 400. At this time, in order to avoid the situation where the sum of the current supplied to the energy storage filter circuit 200 and the current supplied to the circuit to be started 400 exceeds the maximum output current supported by the DC power supply 100 due to supplying power to the energy storage filter circuit 200 and the circuit to be started 400 at the same time, a delay control circuit 300 and a main load power switch 500 are provided.

[0058] Among them, the main load power switch 500 is located between the energy storage filter circuit 200 and the circuit to be started 400. When the main load power switch 500 is disconnected, the DC-DC converter 101 will not supply power to the circuit to be started 400. That is to say, at this time, the DC-DC converter 101 will only supply power to the energy storage filter circuit 200 and the delay control circuit 300.

[0059] When the delay control circuit 300 receives the above startup voltage, it will delay the preset delay time and control the main load power switch 500 to turn on. For example, when the chip is started, when the DC-DC converter 101 has no output, the main load power switch 500 is turned off; when the DC-DC converter 101 has output, the main load power switch 500 is turned on with a delay; during the operation of the chip, if other reset signals are received, the DC-DC converter 101 is reset, the main load power switch 500 is turned off, and the main load power switch 500 is turned on with a delay.

[0060] At this time, since the main load power switch 500 is turned on with a delay, the energy storage filter circuit 200 has stored energy when the main load power switch 500 is turned on, and the DC-DC converter 101 provides a starting voltage to the circuit to be started 400 after the energy storage filter circuit 200 has stored energy.

[0061] Therefore, by setting the delay control circuit 300 and the main load power switch 500, the DC-DC converter 101 can first power the energy storage filter circuit 200 and then provide a starting voltage for the circuit to be started 400, thereby preventing the output current of the DC-DC converter 101 from exceeding the maximum output current supported by the DC-DC converter 101, and achieving smooth startup of the circuit to be started 400.

[0062] The aforementioned circuit to be started 400 may be various analog circuits or digital circuits.

[0063] In some embodiments of the present invention, the DC-DC converter 101 includes: a DC power supply power-on detection device, the input end of the DC power supply power-on detection device is connected to the DC power supply 100, and the output end of the DC power supply power-on detection device is connected to the input end of the DC-DC conversion controller, which is used to output a control signal when it is detected that the DC power supply 100 is powered on and started; a DC-DC power output circuit, the input end of the DC-DC power output circuit is connected to the DC power supply 100, and the output end of the DC-DC power output circuit is designed as the output end of the DC-DC converter 101; a DC-DC conversion controller, the output end of the DC-DC conversion controller is connected to the control end of the DC-DC power output circuit, which is used to control the DC-DC power output circuit to obtain and output a starting voltage according to the current provided by the DC power supply 100 when receiving the control signal.

[0064] In some embodiments of the present invention, the delay control circuit 300 includes: a digital power detection circuit, wherein the input end of the digital power detection circuit is designed to be the input end of the delay control circuit 300, and the output end of the digital power detection circuit is connected to the first input end of the first OR gate, and the digital power detection circuit is used to output a high-level signal when receiving the start-up voltage output by the DC-DC converter 101; a first OR gate, wherein the second input end of the first OR gate is connected to the first external request device, and is used to receive a high-level second start-up request signal output by the first external request device; a delay sub-circuit, wherein the input end of the delay sub-circuit is connected to the output end of the first OR gate, and the output end of the delay sub-circuit is designed to be the output end of the delay control circuit 300, and the delay sub-circuit is used to delay a preset delay time to output a first start-up signal for controlling the main load power switch 500 to turn on when receiving the high-level signal output by the first OR gate.

[0065] In some embodiments of the present invention, the first turn-on signal is a high-level signal, and the delay control circuit 300 further includes: a second OR gate, a first input terminal of the second OR gate is connected to the output terminal of the delay sub-circuit, a second input terminal of the second OR gate is connected to a preset switch turn-on device, and is used to receive a high-level second turn-on signal output by the preset switch turn-on device, and an output terminal of the second OR gate is connected to the control terminal of the main load power switch 500.

[0066] In some embodiments of the present invention, the main load power switch 500 is a MOS tube.

[0067] In some embodiments of the present invention, the energy storage filter circuit 200 includes an output voltage stabilizing capacitor and an inductor, the first end of the inductor is connected to the output end of the DC-DC converter 101, the second end of the inductor is connected to the input end of the delay control circuit 300 and the control end of the main load power switch 500, the first end of the output voltage stabilizing capacitor is grounded, and the second end of the output voltage stabilizing capacitor is connected to the second end of the inductor.

[0068] Specifically, the starting voltage output by the DC-DC converter 101 reaches the second end of the output stabilizing capacitor via the inductor, so that the starting voltage charges the output stabilizing capacitor, and the output stabilizing capacitor stores energy. Moreover, the inductor and the output stabilizing capacitor also filter the starting voltage.

[0069] In some embodiments of the present invention, the control signal is a high-level signal, and the DC-DC converter 101 further includes: a third OR gate, a first input end of the third OR gate is connected to the output end of the DC power supply power-on detection device, a second input end of the third OR gate is connected to the output end of the second external request device, and is used to receive a high-level third start request signal output by the second external request device, and the output end of the third OR gate is connected to the input end of the DC-DC conversion controller; the DC-DC conversion controller is specifically used to control the DC-DC power output circuit to obtain and output a start voltage according to the current provided by the DC power supply 100 when receiving a high-level signal.

[0070] In some embodiments of the present invention, the preset delay time is a delay time obtained based on the equivalent series resistance of the output stabilizing capacitor, the capacitance value of the output stabilizing capacitor, the voltage value of the output voltage of the DC-DC converter 101, the maximum output current of the DC-DC converter 101, and the static current and dynamic current of the startup circuit 400 when it is started.

[0071] In some embodiments of the present invention, the DC power supply 100 is an analog power supply.

[0072] Combine the following Figure 4 The specific embodiment shown is described below.

[0073] exist Figure 4 In the figure, Cout1 is the output voltage stabilizing capacitor. After the output voltage stabilizing capacitor Cout1 is charged, the output voltage stabilizing capacitor Cout1 can work to stabilize the output voltage of the DC-DC converter 101. L1 is an inductor. Cout1 and L1 together form the energy storage filter circuit 200. Switch is the main load power switch 500, 300 is the delay control circuit, 400 is the waiting start circuit, and 102 is Figure 4 The DC-DC power output circuit and the DC-DC conversion controller are integrated, 103 is the third OR gate, 104 is the DC power supply power-on detection device, 301 is the digital power supply detection circuit, 302 is the first OR gate, 303 is the delay sub-circuit, and 304 is the second OR gate. Figure 4 The NMOS in the word means that the NMOS switch uses an N-type metal oxide semiconductor transistor. Figure 4 In the embodiment, the main load power switch 500 is an NMOS switch Switch. The DC power supply 100 is an analog power supply.

[0074] exist Figure 4 In the specific embodiment shown in the figure, AVDD1, LX1, VSENSE1, AVSS1, Vout1, DVDD1, and VSS1 are respectively Figure 1AVDD, LX, VSENSE, AVSS, Vout, DVDD, and VSS in the figure correspond to each other, that is, they have the same meaning. For example, AVDD1 and AVDD are both DC power supply terminals, LX1 and LX are both output ports, and VSENSE1 and VSENSE are both output voltage feedback detection terminals. VDD1 is the above-mentioned preset power supply, and VDD1 needs to ensure that VDD1 is powered on when the DC-DC converter 101 outputs the startup voltage.

[0075] exist Figure 4 In the example, Switch Control is a first start signal for controlling the start of the NMOS switch Switch, and SWControl is a second start signal of a high level output by a preset switch start device. The first start request signal, the second start request signal, and the third start request signal are all start request signals.

[0076] exist Figure 4 In the embodiment, the power-on reset signal DC-DC POR Reset is a high-level control signal output by the DC power supply power-on detection device 104, the second startup request signal is other reset signal Other Reset, and the third startup request signal is reset signal Reset. In other words, the present application supports resetting by a circuit independent of the circuit to be started 400, so that the voltage reset detection circuit and other reset source generation circuits can be placed in a separate power domain, thereby further avoiding circuit startup failure.

[0077] exist Figure 4 In the embodiment, the DC-DC converter 101 is connected to the output terminal of the DC power supply through the DC power supply terminal AVDD1.

[0078] Specifically, the DC-DC converter 101 includes a DC-DC power output circuit, a DC-DC conversion controller, a third OR gate 103 and a DC power supply power-on detection device 104 .

[0079] When the DC power supply receives the first start-up request signal, the DC power supply is powered on, and the DC power supply power-on detection device 104 will send a high-level control signal. When the DC power supply power-on detection device 104 sends a high-level control signal or the second external request device outputs a high-level third start-up request signal, the third OR gate 103 will output a high-level signal to the DC-DC conversion controller. After receiving the high-level signal, the control end of the DC-DC conversion controller controls the DC-DC power output circuit to output a start-up voltage from the output port LX1 according to the current provided by the DC power supply.

[0080] After the DC-DC converter 101 outputs the startup voltage, the startup voltage will power the output stabilizing capacitor Cout1 and be output to the digital power terminal DVDD1, and then output to the digital power detection circuit 301. The digital power detection circuit 301 will output a high level signal when receiving the startup voltage.

[0081] When the digital power detection circuit 301 outputs a high-level signal, or the first external requesting device outputs a high-level second startup request signal, the first OR gate 302 outputs a high-level signal to the delay sub-circuit 303, and the delay sub-circuit 303 delays the output of the first start-up signal to control the NMOS switch Switch to turn on, so that the startup voltage output by the DC-DC power output circuit flows to the circuit to be started 400 through the NMOS switch Switch.

[0082] Moreover, the control of the NMOS switch Switch can also be achieved by a preset switch start device. When the preset switch start device outputs a high-level second start signal SW Control, or the delay sub-circuit 303 outputs a high-level first start signal, the second OR gate 304 will output a high-level Switch Control, so that the NMOS switch Switch is turned on.

[0083] Among them, the above-mentioned preset delay time is the delay time obtained according to the equivalent series resistance of the output stabilizing capacitor Cout1, the capacitance value of the output stabilizing capacitor Cout1, the voltage value of the output voltage of the DC power supply 100, the maximum output current of the DC power supply 100, and the static current and dynamic current of the startup circuit 400 when it is started.

[0084] Specifically, in practical applications, in order to control the starting voltage to be within the maximum output current of the DC power supply 100, the following measures need to be taken: In a specific application, a capacitor with a suitable ESR is selected to control Imax_cout to be smaller than the maximum output current of the DC-DC converter 101. Wherein, Imax_cout is the maximum charging current that the DC-DC converter 101 can provide for the output stabilizing capacitor Cout1.

[0085] That is to say, first, it is necessary to control the maximum charging current that the DC-DC converter 101 can provide for the output stabilizing capacitor Cout1 to be smaller than the maximum output current of the DC-DC converter 101 during startup.

[0086] Second, in a specific application, a suitable preset delay time is selected to turn on the NMOS switch Switch, and the preset delay time can be configured in a non-volatile memory.

[0087] See also Figure 5, the charging current I4 (which varies with charging time) for Cout1 can be calculated as follows: , .

[0088] in, is the charging voltage of the equivalent capacitor C of Cout1, e is a natural constant, t is the charging time, C1 is the capacitance value of the output voltage stabilizing capacitor Cout1, and ESR is the resistance value of the equivalent series resistance of the output voltage stabilizing capacitor Cout1. is the specific current value of I4. is the voltage value of the output voltage of the DC-DC converter 101, that is, the specific voltage value of Vout1.

[0089] In order to successfully start the circuit, the sum of the charging current of Cout1, the static current and the dynamic current of the startup circuit 400 when starting up is required to be less than the maximum output current of the DC-DC converter 101. Therefore, the preset delay time can be calculated as follows: .

[0090] We can get: , , , , .

[0091] in, is the maximum output current value of the DC-DC converter 101 .

[0092] is the current value of the quiescent current when the startup circuit 400 is started, is the current value of the dynamic current when the circuit to be started 400 is started.

[0093] That is to say, the final preset delay time needs to be greater than the above .

[0094] It should be noted that for the above and , these two values ​​are meaningful only when there is no main load power switch 500 or the main load power switch 500 is turned on when the DC-DC converter 101 is started; but if the main load power switch 500 is turned off, these two values ​​are similar to 0.

[0095] For example, assuming that the maximum load operating current supported by the DC-DC converter 101 is 1.5A, the DC-DC converter 101 supports The actual maximum operating current of the load is 750mA, and the actual maximum operating current of the load is 1.4A, leaving a margin of 100mA; during the power-on startup process, Imax_cout=400mA, =350mA, =150mA, then the NMOS switch Switch is not turned on when powered on, and the actual output current Iout=Imax_cout=400mA, which does not exceed the above 750mA; after a time delay of t, the delay module automatically turns on the NMOS switch Switch, and the actual output current Iout=Imax_cout+ + =500mA, and does not exceed the above 750mA, the DC-DC converter 101, the startup circuit 400, and the output stabilizing capacitor Cout1 are all successfully powered on and working.

[0096] In summary, the circuit startup system based on the DC converter of the embodiment of the present invention includes a DC power supply, which is used to power on when receiving a first startup request signal; a main load power switch, the first end of the main load power switch is connected to the output end of the DC-DC converter, the second end of the main load power switch is connected to the input end of the circuit to be started, and the control end of the main load power switch is connected to the output end of the delay control circuit; a DC-DC converter, the input end of the DC-DC converter is connected to the DC power supply, and the output end of the DC-DC converter is connected to the energy storage filter circuit, which is used to output a startup voltage according to the DC power supply to start the energy storage filter circuit; a delay control circuit, the input end of the delay control circuit is connected to the output end of the DC-DC converter, and is used to delay a preset delay time when receiving the startup voltage, and control the main load power switch to turn on, so that the startup voltage starts the circuit to be started. Therefore, by setting the delay control circuit and the main load power switch, it can be realized that the DC-DC converter first supplies power to the energy storage filter circuit, and then provides a startup voltage to the circuit to be started, thereby avoiding that the output current of the DC-DC converter exceeds the maximum output current supported by the DC-DC converter, and realizing the smooth startup of the circuit to be started.

[0097] Furthermore, the present invention also provides a chip.

[0098] Figure 6 It is a structural block diagram of a chip according to an embodiment of the present invention.

[0099] like Figure 6 As shown, the chip 20 includes the circuit startup system 10 based on the DC converter of the above embodiment.

[0100] According to the chip of the embodiment of the present invention, through the circuit startup system based on the DC converter of the above embodiment, a DC power supply is set to power on when receiving the first startup request signal; a main load power switch, the first end of the main load power switch is connected to the output end of the DC-DC converter, the second end of the main load power switch is connected to the input end of the circuit to be started, and the control end of the main load power switch is connected to the output end of the delay control circuit; a DC-DC converter, the input end of the DC-DC converter is connected to the DC power supply, and the output end of the DC-DC converter is connected to the energy storage filter circuit, which is used to output a startup voltage according to the DC power supply to start the energy storage filter circuit; a delay control circuit, the input end of the delay control circuit is connected to the output end of the DC-DC converter, and is used to delay a preset delay time when receiving the startup voltage, and control the main load power switch to start, so that the startup voltage starts the circuit to be started. Therefore, by setting the delay control circuit and the main load power switch, it can be realized that the DC-DC converter first supplies power to the energy storage filter circuit, and then provides a startup voltage to the circuit to be started, thereby avoiding that the output current of the DC-DC converter exceeds the maximum output current supported by the DC-DC converter, and realizing the smooth startup of the circuit to be started.

[0101] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or equipment (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or equipment and execute instructions), or in combination with these instruction execution systems, devices or equipment. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or equipment, or in combination with these instruction execution systems, devices or equipment. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection portion with one or more wirings (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and editable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0102] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0103] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0104] In the description of this specification, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0106] In the description of this specification, unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0108] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A circuit starting system based on a DC converter, characterized in that: include: A direct current power supply, configured to power on and operate upon receiving a first start request signal; A main load power switch, wherein a first end of the main load power switch is connected to an output end of a DC-DC converter, and a second end of the main load power switch is connected to an input end of a circuit to be started; The DC-DC converter, the input end of the DC-DC converter is connected to the DC power supply, the output end of the DC-DC converter is connected to the input end of the delay control circuit and the control end of the main load power switch through the energy storage filter circuit, and the DC-DC converter is used to output a starting voltage according to the DC power supply; The energy storage filter circuit is used to store energy based on the starting voltage and filter the starting voltage; The delay control circuit, whose power supply terminal is connected to a preset power supply, is used to delay a preset delay time when receiving the starting voltage, and control the main load power switch to turn on, so as to start the circuit to be started through the starting voltage.

2. The circuit startup system based on a DC converter according to claim 1, characterized in that: The DC-DC converter comprises: A DC power supply power-on detection device, wherein the input end of the DC power supply power-on detection device is connected to the DC power supply, and the output end of the DC power supply power-on detection device is connected to the input end of the DC-DC conversion controller, and is used to output a control signal when detecting that the DC power supply is powered on; a DC-DC power output circuit, wherein the input end of the DC-DC power output circuit is connected to the DC power supply, and the output end of the DC-DC power output circuit is designed to be the output end of the DC-DC converter; A DC-DC conversion controller, wherein the output end of the DC-DC conversion controller is connected to the control end of the DC-DC power output circuit, and is used to control the DC-DC power output circuit to obtain and output the starting voltage according to the current provided by the DC power supply when receiving the control signal.

3. The circuit startup system based on a DC converter according to claim 1, characterized in that: The delay control circuit comprises: A digital power detection circuit, wherein the input end of the digital power detection circuit is designed to be the input end of the delay control circuit, the output end of the digital power detection circuit is connected to the first input end of the first OR gate, and the digital power detection circuit is used to output a high level signal when receiving the starting voltage output by the DC-DC converter; The first OR gate, wherein a second input terminal of the first OR gate is connected to a first external request device, and is used to receive a high-level second start request signal output by the first external request device; A delay subcircuit, wherein the input end of the delay subcircuit is connected to the output end of the first OR gate, the output end of the delay subcircuit is designed to be the output end of the delay control circuit, and the delay subcircuit is used to delay the preset delay time to output the first start signal for controlling the main load power switch to turn on when receiving the high-level signal output by the first OR gate.

4. The circuit startup system based on a DC converter according to claim 3, characterized in that: The first start signal is a high level signal, and the delay control circuit further includes: A second OR gate, wherein the first input terminal of the second OR gate is connected to the output terminal of the delay sub-circuit, the second input terminal of the second OR gate is connected to the preset switch start device, and is used to receive a high-level second start signal output by the preset switch start device, and the output terminal of the second OR gate is connected to the control terminal of the main load power switch.

5. The circuit startup system based on a DC converter according to claim 4, characterized in that: The main load power switch adopts a MOS tube.

6. The circuit startup system based on a DC converter according to claim 3, characterized in that: The energy storage filter circuit includes an output voltage stabilizing capacitor and an inductor, wherein a first end of the inductor is connected to an output end of the DC-DC converter, a second end of the inductor is connected to an input end of the delay control circuit and a control end of the main load power switch, a first end of the output voltage stabilizing capacitor is grounded, and a second end of the output voltage stabilizing capacitor is connected to a second end of the inductor.

7. The circuit startup system based on a DC converter according to claim 2, characterized in that: The control signal is a high level signal, and the DC-DC converter further includes: a third OR gate, wherein a first input terminal of the third OR gate is connected to an output terminal of the DC power supply power-on detection device, a second input terminal of the third OR gate is connected to an output terminal of a second external request device, and is used to receive a third start request signal of a high level output by the second external request device, and an output terminal of the third OR gate is connected to an input terminal of the DC-DC conversion controller; The DC-DC conversion controller is specifically used to control the DC-DC power output circuit to obtain and output the starting voltage according to the current provided by the DC power supply when receiving a high level signal.

8. The circuit startup system based on a DC converter according to claim 6, characterized in that: The preset delay time is a delay time obtained based on the equivalent series resistance of the output stabilizing capacitor, the capacitance value of the output stabilizing capacitor, the voltage value of the output voltage of the DC-DC converter, the maximum output current of the DC-DC converter, and the static current and dynamic current of the circuit to be started when it is started.

9. The circuit startup system based on a DC converter according to claim 1, characterized in that: The DC power supply adopts an analog power supply.

10. A chip, characterized in that: A circuit starting system based on a DC converter comprising the circuit starting system according to any one of claims 1-9.

Images